CEN/TS 1046:2021
(Main)Thermoplastics piping and ducting systems - Outside the building structures for gravity and pressurised systems - Trench installation
Thermoplastics piping and ducting systems - Outside the building structures for gravity and pressurised systems - Trench installation
This document gives the recommended practise for underground open trench installation and commissioning of thermoplastics piping systems to be used for the conveyance of water under pressure (in addition to EN 805) and for the discharge of wastewater under gravity (in addition to EN 1610) .
In the field of non-pressure underground drainage and sewerage this is reflected in the marking of products by application code "U" and "UD":
- outside the building structure (U);
- both buried in ground within the building structure (application area code "D") and outside the
building (application area code "UD").
This document covers also installation and/or connections to valves, manholes, inspection chambers, gullies and other ancillary components in piping systems.
NOTE 1 Code of practise for pipelines for gas supply is covered by EN 12007-series [21].
NOTE 2 Recommended practices for installation of plastic piping systems for soil and waste discharge within the building structure is covered by CEN/TR 13801 [12].
NOTE 3 Practices for underground installation of rainwater infiltration and storage attenuation systems are covered by CEN/TR 17179 [13].
NOTE 4 It is assumed that additional recommendations and/or requirements are detailed in the individual product standards.
NOTE 5 If non-plastic components are part of the plastic system the manufacturer's instructions should be taken into account.
Requirements and instructions concerning commissioning of systems can be found in EN 805 and EN 1610 and the relevant national and/or local regulations. This document gives specific additional recommendations for commissioning relevant for plastic piping systems.
Attention is drawn to any relevant local and/or national regulations (e.g. health, safety and hygienic requirements).
Thermoplastische Kunststoff-Rohrleitungs- und Schutzrohr-Systeme - Systeme außerhalb der Gebäudestruktur zum Transport von Wasser oder Abwasser - Verfahren zur unterirdischen Verlegung
Systèmes de canalisations et de gaines en matières thermoplastiques - Système d'adduction d'eau ou d'assainissement à l'extérieur de la structure des bâtiments - Pratiques pour la pose en enterrée
Cevni in kanalski sistemi iz plastomernih materialov - Sistemi zunaj stavb za transport vode in odpadne vode - Postopki za vgradnjo pod zemljo
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST-TS CEN/TS 1046:2021
01-julij-2021
Nadomešča:
SIST-TP CEN/TR 1046:2014
Cevni in kanalski sistemi iz plastomernih materialov - Sistemi zunaj stavb za
transport vode in odpadne vode - Postopki za vgradnjo pod zemljo
Thermoplastics piping and ducting systems - Outside the building structures for gravity
and pressurised systems - Trench installationThermoplastische Kunststoff-Rohrleitungs- und Schutzrohr-Systeme - Systeme
außerhalb der Gebäudestruktur zum Transport von Wasser oder Abwasser - Verfahren
zur unterirdischen Verlegung
Systèmes de canalisations et de gaines en matières thermoplastiques - Système
d'adduction d'eau ou d'assainissement à l'extérieur de la structure des bâtiments -
Pratiques pour la pose en enterréeTa slovenski standard je istoveten z: CEN/TS 1046:2021
ICS:
23.040.03 Cevovodi za zunanje sisteme Pipeline and its parts for
transporta vode in njihovi deli external water conveyance
systems
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST-TS CEN/TS 1046:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST-TS CEN/TS 1046:2021
CEN/TS 1046
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
May 2021
TECHNISCHE SPEZIFIKATION
ICS 23.040.45; 93.030; 23.040.05; 23.040.20 Supersedes CEN/TR 1046:2013
English Version
Thermoplastics piping and ducting systems - Outside the
building structures for gravity and pressurised systems -
Trench installation
Systèmes de canalisations et de gaines en matières Thermoplastische Kunststoff-Rohrleitungs- und
thermoplastiques - Système d'adduction d'eau ou Schutzrohr-Systeme - Systeme außerhalb der
d'assainissement à l'extérieur de la structure des Gebäudestruktur zum Transport von Wasser oder
bâtiments - Pratiques pour la pose en enterrée Abwasser - Verfahren zur unterirdischen Verlegung
This Technical Specification (CEN/TS) was approved by CEN on 12 April 2021 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 1046:2021 E
worldwide for CEN national Members.---------------------- Page: 3 ----------------------
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CEN/TS 1046:2021 (E)
Contents Page
European foreword ...................................................................................................................................................... 3
Introduction .................................................................................................................................................................... 4
1 Scope .................................................................................................................................................................... 5
2 Normative references .................................................................................................................................... 5
3 Terms and definitions ................................................................................................................................... 5
4 Symbols .............................................................................................................................................................. 6
5 Abbreviations ................................................................................................................................................... 7
6 Delivery, handling, transportation and storage on site .................................................................... 7
6.1 General................................................................................................................................................................ 7
6.2 Handling and transportation ...................................................................................................................... 7
6.3 Storage of pipes ............................................................................................................................................... 8
6.4 Storage of fittings and other products..................................................................................................... 8
7 Installation ........................................................................................................................................................ 9
7.1 General................................................................................................................................................................ 9
7.2 Trench construction ...................................................................................................................................... 9
7.2.1 General................................................................................................................................................................ 9
7.2.2 Trench width .................................................................................................................................................... 9
7.2.3 Trench depth .................................................................................................................................................. 11
7.2.4 Trench bottom and bedding ..................................................................................................................... 11
7.2.5 Jointing preparation .................................................................................................................................... 16
7.2.6 Installation, procedures and control ..................................................................................................... 16
7.2.7 Backfilling ........................................................................................................................................................ 20
8 Plastic manholes, inspection chambers and gullies ......................................................................... 24
9 Side connections ............................................................................................................................................ 24
10 Bending under ambient temperatures ................................................................................................. 25
11 Waste treatment ............................................................................................................................................ 25
12 Inspection and testing ................................................................................................................................. 25
12.1 Inspection after installation ..................................................................................................................... 25
12.2 Tightness and pressure testing ................................................................................................................ 25
12.3 Permissible deformation ........................................................................................................................... 26
Annex A (informative) Classification of soils ................................................................................................... 27
Bibliography ................................................................................................................................................................. 30
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CEN/TS 1046:2021 (E)
European foreword
This document (CEN/TS 1046:2021) has been prepared by Technical Committee CEN/TC 155 “Plastics
piping systems and ducting systems”, the secretariat of which is held by NEN.Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes CEN/TR 1046:2013.This document is changed fundamentally by taking out design topics and topics already dealt with in
EN 1610 and EN 805. The lay-out was changed and the pressure systems are described more in detail.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.---------------------- Page: 5 ----------------------
SIST-TS CEN/TS 1046:2021
CEN/TS 1046:2021 (E)
Introduction
This document contains guidance for installation procedures for thermoplastics piping systems and
their components intended to be used below ground for pressure and non-pressure applications
outside building structures. This document is intended to be used in conjunction with general standards
for installation recommendations, for example those issued by CEN/TC 164 “Water supply” and
CEN/TC 165 “Waste water engineering” as stated in EN 805 and EN 1610 respectively.
NOTE 1 Guidelines for installation of pipelines made out of thermosetting materials can be found in the ISO/TS
10465 series [23].This document is based on the results from research with full-scale trials undertaken by the
thermoplastics pipes industry and expressed in CEN/TS 15223.This document is a guidance document only. It provides a set of general guidelines which gives best
practices for underground installation of thermoplastics piping and ducting systems outside building
structures.This document includes recommendations for the pipe surround and backfilling procedures but not
road base and road sub-base details. Attention is drawn to any national regulations which may cover
these or other aspects of the installation.This document does not cover matters relating to renovation of existing pipeline systems using lining
techniques, or replacement of existing pipeline systems using trenchless techniques.
NOTE 2 Guidelines for installation of lining techniques can be found in the EN 12889 series
This document is intended to be used by authorities, design engineers, installation contractors and
manufacturers.In this document, much of the guidance is expressed as requirements, e.g. by use of “shall” or by
instructions in the imperative. It is strongly recommended that these be followed whenever applicable.
Other guidance is presented for consideration as a matter of judgement in each case, e.g. by use of
“should”.---------------------- Page: 6 ----------------------
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CEN/TS 1046:2021 (E)
1 Scope
This document gives the recommended practise for underground open trench installation and
commissioning of thermoplastics piping systems to be used for the conveyance of water under pressure
(in addition to EN 805) and for the discharge of wastewater under gravity (in addition to EN 1610).
In the field of non-pressure underground drainage and sewerage this is reflected in the marking of
products by application code “U” and “UD”:— outside the building structure (U);
— both buried in ground within the building structure (application area code “D”) and outside the
building (application area code “UD”).This document covers also installation and/or connections to valves, manholes, inspection chambers,
gullies and other ancillary components in piping systems.NOTE 1 Code of practise for pipelines for gas supply is covered by EN 12007-series [21].
NOTE 2 Recommended practices for installation of plastic piping systems for soil and waste discharge within
the building structure is covered by CEN/TR 13801 [12].NOTE 3 Practices for underground installation of rainwater infiltration and storage attenuation systems are
covered by CEN/TR 17179 [13].NOTE 4 It is assumed that additional recommendations and/or requirements are detailed in the individual
product standards.NOTE 5 If non-plastic components are part of the plastic system there will be applicable manufacturer's
instructions.Requirements and instructions concerning commissioning of systems can be found in EN 805 and
EN 1610 and the relevant national and/or local regulations. This document gives specific additional
recommendations for commissioning relevant for plastic piping systems.Attention is drawn to any relevant local and/or national regulations (e.g. health, safety and hygienic
requirements).2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 805, Water supply - Requirements for systems and components outside buildingsEN 1610:2015, Construction and testing of drains and sewers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply in addition to EN 1610.
3.1deformation
change in the true shape of the cross-section
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CEN/TS 1046:2021 (E)
3.2
deflection
change of direction
3.3
trench
excavation of the soil for the underground embedment of the pipeline
Note 1 to entry: See Figure 1 for an illustration of the meaning and limits of the terms used in this document.
Key1 surface 10 depth of cover
2 bottom of road or railway construction, if any 11 depth of bedding
3 trench walls 12 depth of embedment
4 main backfill 13 trench depth
5 initial backfill, c a thickness of lower bedding
6 sidefill b thickness of upper bedding
7 upper bedding, b c thickness of initial backfill
8 lower bedding, a OD outside diameter (vertical)
9 trench bottom x/2 working space
Note 2 to entry: For minimum values of a and c, see 7.2.4.1.
Figure 1 — Terminology trench cross-section
4 Symbols
For the purposes of this document, the following symbols apply:
x w -OD
min
x/2 horizontal clearance between the pipe or fitting and the trench sidewall or an
adjacent pipe or fittingd (mean) external diameter of a pipe
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CEN/TS 1046:2021 (E)
e pipe wall thickness
w minimum trench width
min
M compaction classification: Moderate
N compaction classification: Not
W compaction classification: Well
β the angle of unsupported trench side measured to the horizontal
5 Abbreviations
For the purposes of this document, the following abbreviations apply:
DN/OD nominal outside diameter of a pipe and associated fittings;
OD outside diameter
OD horizontal outside diameter
vertical outside diameter
DN nominal diameter
SN stiffness number or classification
SDR standard dimension ratio
PN nominal pressure
UV ultraviolet
STP system test pressure
6 Delivery, handling, transportation and storage on site
6.1 General
Correct delivery, handling, transportation and storage is a pre-condition for good installation and the
performance of the system.Products shall be inspected on delivery to ensure that they are marked and packed (e.g. plugged pipe
ends for drinking water) in compliance with the specification (e.g. product standard, SN, SDR, PN,
DN/OD and material designation). Non-compliant products should not be accepted and appropriate
measures should be taken to avoid the use of these products.Products shall be examined both on delivery and immediately prior to installation to ensure that they
are free from damage, assessed in accordance with the relevant Product Standard. Damaged products
should be marked and appropriate measures should be taken to avoid the use of these products.
6.2 Handling and transportationRegarding handling and transportation the following should be taken into account:
— any handling or transportation instructions from the manufacturer should be complied with;
— pipes may be supplied in straight lengths or coiled forms (either free standing or on drums).
Care should be taken when de-coiling pipes, as considerable forces can be released;
— secure the products or product bundles effectively before transporting on the site;
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CEN/TS 1046:2021 (E)
— when transporting socketed pipes, loading of the sockets should be avoided;
— when handling products care should be taken to prevent damage;
NOTE Avoid lifting equipment with sharp edges.
— the impact resistance of thermoplastics products is reduced at low temperatures. Under these
conditions, take more care during handling. Where cold conditions are expected, the advice of the
manufacturer should be followed.6.3 Storage of pipes
Regarding storage of pipes the following should be taken into account:
— manufacturers' instructions should be followed;
— when pipes or coils are stored on site in stacks, the manufacturer's advice regarding correct
practice should be followed;— stack the pipes or coils on reasonably flat surfaces free from sharp objects, stones or projections
in order to avoid localized deformation or damage to the pipes;— respect the maximum stacking height as defined by the manufacturer;
— do not place products in close proximity to fuels, solvents, oils, greases, paints and/or heat
sources;— storage in direct sunlight for long periods and/or high temperatures could cause deformations
which could affect the jointing negatively. To avoid this risk, the following precautions are
recommended:— limit the height of the stacks of pipes;
— shield the stacks of pipes from continuous and direct sunlight;
— arrange to allow the free passage of air around the pipes.
— pipes have a restriction for storage under direct UV radiation. Respect therefor the manufacturer's
storage instructions.NOTE Fading of the colour is not necessarily affecting the mechanical properties of products.
6.4 Storage of fittings and other productsRegarding storage of fittings and other products the following should be taken into account:
— manufacturer’s instructions should be followed;— the original packaging should be kept intact if products are supplied in packaging, the
packaging should be removed as late as possible prior to installation;— products should be protected from environmental influences;
— it's recommended to store the products below +50 °C;
— the products should be protected from direct exposure to sunlight;
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CEN/TS 1046:2021 (E)
— the products should be protected from other heavy energy radiation from devises.
7 Installation7.1 General
Deformation in a plastic piping system (pressure and non-pressure) is significantly influenced by the
quality of the installation, especially the degree of compaction and choice of bedding material. The use
of the installation procedures detailed in this document will minimize the deformation. A more detailed
description of this behaviour and its limitations is given in CEN/TS 15223:2017, 7.2 and 7.3.
The most commonly used practice for the installation of thermoplastics systems is to surround the pipe
(see Figure 1, key 5+6+7+8) with one type of bedding material.7.2 Trench construction
7.2.1 General
Operations in open trenches are carried out in potentially hazardous conditions.
Where appropriate apply shore, sheet, brace, slope or other supports of the trench walls to protect any
person in the trench. When the trench is occupied take precautions:— to prevent objects from falling into the trench;
— to prevent collapse caused by the position or movements of adjacent machinery or equipment.
Excavated material should be deposited at a distance of not less than 0,5 m from the edge of the trench,
and the proximity and height of the excavated material (spoil bank) should not be allowed to endanger
the stability of the excavation.When trench supports such as sheet piling or similar is used, the pipe support and any compacted soil
around the pipe shall be maintained throughout installation. Ensure that sheeting is sufficiently tight to
prevent washing soil out of the trench wall from behind the sheeting.If trench supports are removed after the trench has been backfilled, care should be taken to not disturb
the compaction of the primary backfill material around the pipe.If it is not possible to remove trench supports without disturbing the trench compaction, it is
recommended to keep the sheeting in place to prevent loss of support of foundation and embedment
materials. Vertical and horizontal braces should be left in place. Top cross bracing may need to be
installed if the top of the sheeting is cut off to accommodate for landscaping. Sheeting that is to be left in
the trench shall be constructed of materials that will not corrode or rot, resulting in a loss of support for
the pipe.7.2.2 Trench width
The width of the trench at the springline of the pipe should not be greater than necessary to provide
adequate room for jointing the pipe in the trench and compacting the pipe zone backfill at the haunches.
The minimum trench width (see Figure 1 and 2) is given in Table 1 and Table 2.NOTE Table 1 is in compliance with the requirements of EN 1610.
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CEN/TS 1046:2021 (E)
Table 1 — Minimum trench width depending on the nominal diameter (DN) of the pipe
Minimum trench width (OD + x)Nominal size (DN)
Unsupported trench
Supported trench
β ˃60° β ≤ 60°
OD + 0,40 OD + 0,40
DN ≤ 225
h h
OD + 0,50 OD + 0,50 OD + 0,40
225 < DN ≤ 350
h h h
OD + 0,70 OD + 0,70 OD + 0,40
350 < DN ≤ 700
h h h
OD + 0,85 OD + 0,85 OD + 0,40
700 < DN ≤ 1 200
h h h
OD + 1,00 OD + 1,00 OD + 0,40
DN ˃ 1 200
h h h
See Figure 2.
Key
w minimum trench width
min
a thickness of lower bedding
b thickness of upper bedding
x/2 working space next to pipe
β angle of unsupported trench
Figure 2 — Working space next to the pipe and angle of unsupported trench
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CEN/TS 1046:2021 (E)
Table 2 — Minimum trench width depending on the trench depth
Minimum trench width
Trench depth (Td)
Td < 1,00 No minimum width required
1,00 ≤ Td ≤ 1,75 0,80
1,75 < Td ≤ 4,00 0,90
Td ˃ 4,00 1,00
Stability shall be ensured either by means of a trench support system, by battering the trench
sides to a stable slope which can be maintained during the works or by other suitable means. The
maximum depth of unsupported trenches with vertical trench walls shall be limited according to
national regulations and in any case less than 1,4 m.Wider trenches may be necessary for installations involving, e.g. relatively deep burial or unstable
native soils. Narrower trenches may be used when the system design permits or access by persons is
not required.Parallel piping systems laid within a common trench shall be spaced sufficiently far apart to allow
compaction equipment, if used, to compact the pipe zone backfill material between the pipes.
A clearance of at least 150 mm greater than the width of the widest piece of compaction equipment
used is considered as a practical clearance between the pipes.7.2.3 Trench depth
Determine the trench depth by the pipeline design, intended service, pipe properties, size of pipe and
local conditions such as the properties of soil and combination of static and dynamic loading.
In general, care should be taken that the depth of cover above the crown of the pipe for pipes passing
under traffic areas should usually be a minimum of 600 mm, although shallower depths may be used
when the installation is designed accordingly.When determining the trench depth, allowance for a suitable bedding should be incorporated.
Take care to ensure that the burial depth is sufficient to prevent the conveyed fluids from being affected
by frost.Sufficient cover or other suitable constructions should be provided to prevent accidental pipe flotation
in potentially high ground water areas.It is generally recommended not to dig the trench too far in advance of pipe laying and to backfill as
soon as possible after pipe laying.In frost conditions, it may be necessary to protect the trench bottom so that frozen layers are not left
under the pipe.7.2.4 Trench bottom and bedding
7.2.4.1 General
A pipe requires uniform support for the whole of its length and this is provided by the bedding layer. To
provide this uniform support, the bedding layer should in average have a minimum thickness of
100 mm and on individual places not less than 50 mm.The material used shall be granular, such as gravel, sand or crushed rock, and shall conform to 7.2.7.3
and Annex A.---------------------- Page: 13 ----------------------
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CEN/TS 1046:2021 (E)
The bedding material should be spread evenly across the full width of the trench and levelled to the
gradient of the pipeline and, if necessary, compacted.Two bedding constructions can be distinguished:
— bedding construction type 1;
— bedding construction type 2.
Bedding construction type 1 (Figure 3) may be used in all types of embedment, providing support for
the pipes over their whole barrel length, using the layer thickness requirements for a and b. This
includes any size and shape of pipes e.g. circular, non-circular, flat based. Unless specified otherwise,
the thickness of the lower bedding a, measured under the barrel, shall not be less than:
— 100 mm in usual soil conditions;— 150 mm in rock or hard soil conditions.
The thickness b of upper bedding shall be as specified in the structural design.
Bedding construction type 2 (Figure 4) may be used in uniform relatively soft fine-grained soil
providing support for the pipes over their whole barrel length. Pipes may be laid directly on the shaped,
trimmed bottom of the trench. The thickness b of upper bedding shall be as specified in the structural
design.Key
a thickness of lower bedding
b thickness of upper bedding
OD outside diameter (vertical)
Figure 3 — Bedding construction type 1
Key
b thickness of upper bedding
OD outside diameter (vertical)
Figure 4 — Bedding construction type 2
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CEN/TS 1046:2021 (E)
Where necessary, holes in the lower bedding or trench bottom shall be provided to allow sufficient
space for proper assembly of the joints and products to prevent the pipe from resting on the joint or
product. The hole should not be larger than necessary to accomplish proper assembly.
The upper and lower-bedding at the trench (see Figure 1) shall be continuous, uniform and free of
particles greater than those specified in Table 3 for the applicable pipe size.Over-excavation of the trench bottom is required, when:
— rock, cobbles or hardpan are encountered;
— quick sands or similar soils, organic soils or soils are present that exhibit a volume change with a
change in moisture content may be encountered in the bottom of the trench.Each such situation shall be evaluated on a case-by-case basis during construction to determine the
extent of over-excavation and the type of foundation material to be used.Where over-excavation is performed, including accidental over-excavation during construction, it is
recommended that the material for the foundation zone shall be the same as for the bedding zone and
shall be compacted to class W (see 7.2.7.3).Compact the foundation material uniformly in accordance with 7.2.7.4.
During the installation work, trenches shall be kept free of water, e.g. rainwater, leachate, spring water,
ground water or water leakage from pipelines. The mode of drainage should not affect the pipe zone
and the pipeline.Precautions shall be taken to prevent the erosion of fine material during water control. The influence of
drainage measures on groundwater movement and the stability of the surrounding soil shall be
considered.The water level should
...
SLOVENSKI STANDARD
kSIST-TS FprCEN/TS 1046:2021
01-februar-2021
Cevni in kanalski sistemi iz plastomernih materialov - Sistemi zunaj stavb za
transport vode in odpadne vode - Postopki za vgradnjo pod zemljo
Thermoplastics piping and ducting systems - Outside the building structures for gravity
and pressurised systems - Trench installationThermoplastische Kunststoff-Rohrleitungs- und Schutzrohr-Systeme - Systeme
außerhalb der Gebäudestruktur zum Transport von Wasser oder Abwasser - Verfahren
zur unterirdischen Verlegung
Systèmes de canalisations et de gaines en matières thermoplastiques - Système
d'adduction d'eau ou d'assainissement à l'extérieur de la structure des bâtiments -
Pratiques pour la pose en enterréeTa slovenski standard je istoveten z: FprCEN/TS 1046
ICS:
23.040.03 Cevovodi za zunanje sisteme Pipeline and its parts for
transporta vode in njihovi deli external water conveyance
systems
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
kSIST-TS FprCEN/TS 1046:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------kSIST-TS FprCEN/TS 1046:2021
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kSIST-TS FprCEN/TS 1046:2021
FINAL DRAFT
TECHNICAL SPECIFICATION
FprCEN/TS 1046
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
December 2020
ICS 23.040.01; 93.030 Will supersede CEN/TR 1046:2013
English Version
Thermoplastics piping and ducting systems - Outside the
building structures for gravity and pressurised systems -
Trench installation
Systèmes de canalisations et de gaines en matières Thermoplastische Kunststoff-Rohrleitungs- und
thermoplastiques - Système d'adduction d'eau ou Schutzrohr-Systeme - Systeme außerhalb der
d'assainissement à l'extérieur de la structure des Gebäudestruktur zum Transport von Wasser oder
bâtiments - Pratiques pour la pose en enterrée Abwasser - Verfahren zur unterirdischen Verlegung
This draft Technical Specification is submitted to CEN members for Vote. It has been drawn up by the Technical Committee
CEN/TC 155.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.Warning : This document is not a Technical Specification. It is distributed for review and comments. It is subject to change
without notice and shall not be referred to as a Technical Specification.EUROPEAN COMMITTEE FOR STANDARDIZATION
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© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TS 1046:2020 E
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Contents Page
European foreword ...................................................................................................................................................... 3
Introduction .................................................................................................................................................................... 4
1 Scope .................................................................................................................................................................... 5
2 Normative references .................................................................................................................................... 5
3 Terms and definitions ................................................................................................................................... 5
4 Symbols .............................................................................................................................................................. 6
5 Abbreviations ................................................................................................................................................... 7
6 Delivery, handling, transportation and storage on site .................................................................... 7
6.1 General................................................................................................................................................................ 7
6.2 Handling and transportation ...................................................................................................................... 7
6.3 Storage of pipes ............................................................................................................................................... 8
6.4 Storage of fittings and other products..................................................................................................... 8
7 Installation ........................................................................................................................................................ 9
7.1 General................................................................................................................................................................ 9
7.2 Trench construction ...................................................................................................................................... 9
7.2.1 General................................................................................................................................................................ 9
7.2.2 Trench width .................................................................................................................................................... 9
7.2.3 Trench depth .................................................................................................................................................. 11
7.2.4 Trench bottom and bedding ..................................................................................................................... 11
7.2.5 Jointing preparation .................................................................................................................................... 16
7.2.6 Installation, procedures and control ..................................................................................................... 16
7.2.7 Backfilling ........................................................................................................................................................ 20
8 Plastic manholes, inspection chambers and gullies ......................................................................... 24
9 Side connections ............................................................................................................................................ 24
10 Bending under ambient temperatures ................................................................................................. 25
11 Waste treatment ............................................................................................................................................ 25
12 Inspection and testing ................................................................................................................................. 25
12.1 Inspection after installation ..................................................................................................................... 25
12.2 Tightness and pressure testing ................................................................................................................ 25
12.3 Permissible deformation ........................................................................................................................... 26
Annex A (informative) Classification of soils ..................................................................................................... 27
A.1 General.............................................................................................................................................................. 27
Bibliography ................................................................................................................................................................. 30
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European foreword
This document (FprCEN/TS 1046:2020) has been prepared by Technical Committee CEN/TC 155
“Plastics piping systems and ducting systems”, the secretariat of which is held by NEN.
This document is currently submitted to the Vote on TS.This document will supersede CEN/TR 1046:2014.
This document is changed fundamentally by taking out design topics and topics already dealt with in
EN 1610 and EN 805. The lay-out was changed and the pressure systems are described more in detail.
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Introduction
This Document contains guidance for installation procedures for thermoplastics piping systems and
their components intended to be used below ground for pressure and non-pressure applications
outside building structures. This document is intended to be used in conjunction with general standards
for installation recommendations, for example those issued by CEN/TC 164 “Water supply” and
CEN/TC 165 “Waste water engineering” as stated in EN 805 and EN 1610 respectively.
NOTE Guidelines for installation of pipelines made out of thermosetting materials can be found in the ISO/TS
10465 series [23].This Document is based on the results from research with full-scale trials undertaken by the
thermoplastics pipes industry and expressed in CEN/TS 15223.This Document is a guidance document only. It provides a set of general guidelines which gives best
practices for underground installation of thermoplastics piping and ducting systems outside building
structures.This Document includes recommendations for the pipe surround and backfilling procedures but not
road base and road sub-base details. Attention is drawn to any national regulations which may cover
these or other aspects of the installation.This Document does not cover matters relating to renovation of existing pipeline systems using lining
techniques, or replacement of existing pipeline systems using trenchless techniques.
NOTE Guidelines for installation of lining techniques can be found in the EN 12889 series
This Document is intended to be used by authorities, design engineers, installation contractors and
manufacturers.In this Document, much of the guidance is expressed as requirements, e.g. by use of “shall” or by
instructions in the imperative. It is strongly recommended that these be followed whenever applicable.
Other guidance is presented for consideration as a matter of judgement in each case, e.g. by use of
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1 Scope
This document gives the recommended practise for underground open trench installation and
commissioning of thermoplastics piping systems to be used for the conveyance of water under pressure
(in addition to EN 805) and for the discharge of wastewater under gravity (in addition to EN 1610).
In the field of non-pressure underground drainage and sewerage this is reflected in the marking of
products by application code “U” and “UD”:— outside the building structure (U);
— both buried in ground within the building structure (application area code “D”) and outside the
building (application area code “UD”).This document covers also installation and/or connections to valves, manholes, inspection chambers,
gullies and other ancillary components in piping systems.NOTE 1 Code of practise for pipelines for gas supply is covered by EN 12007-series [21].
NOTE 2 Recommended practices for installation of plastic piping systems for soil and waste discharge within
the building structure is covered by CEN/TR 13801 [12].NOTE 3 Practices for underground installation of rainwater infiltration and storage attenuation systems are
covered by CEN/TR 17179 [13].NOTE 4 It is assumed that additional recommendations and/or requirements are detailed in the individual
product standards.NOTE 5 If non-plastic components are part of the plastic system there will be applicable manufacturer's
instructions.Requirements and instructions concerning commissioning of systems can be found in EN 805 and
EN 1610 and the relevant national and/or local regulations. This document gives specific additional
recommendations for commissioning relevant for plastic piping systems.Attention is drawn to any relevant local and/or national regulations (e.g. health, safety and hygienic
requirements).2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 805, Water supply — Requirements for systems and components outside buildingsEN 1610:2015, Construction and testing of drains and sewers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply in addition to EN 1610.
3.1deformation
change in the true shape of the cross-section
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3.2
deflection
change of direction
3.3
trench
excavation of the soil for the underground embedment of the pipeline
Note 1 to entry: See Figure 1 for an illustration of the meaning and limits of the terms used in this document.
Key1 surface 10 depth of cover
2 bottom of road or railway construction, if any 11 depth of bedding
3 trench walls 12 depth of embedment
4 main backfill 13 trench depth
5 initial backfill, c a thickness of lower bedding
6 sidefill b thickness of upper bedding
7 upper bedding, b c thickness of initial backfill
8 lower bedding, a OD outside diameter (vertical)
9 trench bottom x/2 working space
Note 1 to entry: For minimum values of a and c, see 7.2.4.1.
Figure 1 — Terminology trench cross-section
4 Symbols
For the purposes of this document, the following symbols apply:
x w -OD
min
x/2 horizontal clearance between the pipe or fitting and the trench sidewall or an
adjacent pipe or fittingd (mean) external diameter of a pipe
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e pipe wall thickness
w minimum trench width
min
M compaction classification: Moderate
N compaction classification: Not
W compaction classification: Well
β the angle of unsupported trench side measured to the horizontal
5 Abbreviations
For the purposes of this document, the following abbreviations apply:
DN/OD nominal outside diameter of a pipe and associated fittings;
OD outside diameter
OD Horizontal outside diameter
outside diameter (vertical)
DN nominal diameter
SN stiffness number or classification
SDR standard dimension ratio
PN nominal pressure
UV ultraviolet
STP system test pressure
6 Delivery, handling, transportation and storage on site
6.1 General
Correct delivery, handling, transportation and storage is a pre-condition for good installation and the
performance of the system.Products shall be inspected on delivery to ensure that they are marked and packed (e.g. plugged pipe
ends for drinking water) in compliance with the specification (e.g. product standard, SN, SDR, PN,
DN/OD and material designation). Non-compliant products should not be accepted and appropriate
measures should be taken to avoid the use of these products.Products shall be examined both on delivery and immediately prior to installation to ensure that they
are free from damage, assessed in accordance with the relevant Product Standard. Damaged products
should be marked and appropriate measures should be taken to avoid the use of these products.
6.2 Handling and transportationRegarding handling and transportation the following should be taken into account:
— any handling or transportation instructions from the manufacturer should be complied with;
— pipes may be supplied in straight lengths or coiled forms (either free standing or on drums).
Care should be taken when de-coiling pipes, as considerable forces can be released;
— secure the products or product bundles effectively before transporting on the site;
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— when transporting socketed pipes, loading of the sockets should be avoided;
— when handling products care should be taken to prevent damage;
NOTE Avoid lifting equipment with sharp edges.
— the impact resistance of thermoplastics products is reduced at low temperatures. Under these
conditions, take more care during handling. Where cold conditions are expected, the advice of the
manufacturer should be followed.6.3 Storage of pipes
Regarding storage of pipes the following should be taken into account:
— manufacturers' instructions should be followed;
— when pipes or coils are stored on site in stacks, the manufacturer's advice regarding correct
practice should be followed;— stack the pipes or coils on reasonably flat surfaces free from sharp objects, stones or projections
in order to avoid localized deformation or damage to the pipes;— respect the maximum stacking height as defined by the manufacturer;
— do not place products in close proximity to fuels, solvents, oils, greases, paints and/or heat
sources;— storage in direct sunlight for long periods and/or high temperatures could cause deformations
which could affect the jointing negatively. To avoid this risk, the following precautions are
recommended:— limit the height of the stacks of pipes;
— shield the stacks of pipes from continuous and direct sunlight;
— arrange to allow the free passage of air around the pipes.
— pipes have a restriction for storage under direct UV radiation. Respect therefor the manufacturer's
storage instructions.NOTE Fading of the colour is not necessarily affecting the mechanical properties of products.
6.4 Storage of fittings and other productsRegarding storage of fittings and other products the following should be taken into account:
— manufacturer’s instructions should be followed;— the original packaging should be kept intact if products are supplied in packaging, the
packaging should be removed as late as possible prior to installation;— products should be protected from environmental influences;
— it's recommended to store the products below +50 °C;
— the products should be protected from direct exposure to sunlight;
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— the products should be protected from other heavy energy radiation from devises.
7 Installation7.1 General
Deformation in a plastic piping system (pressure and non-pressure) is significantly influenced by the
quality of the installation, especially the degree of compaction and choice of bedding material. The use
of the installation procedures detailed in this document will minimize the deformation. A more detailed
description of this behaviour and its limitations is given in CEN/TS 15223:2017, 7.2 and 7.3.
The most commonly used practice for the installation of thermoplastics systems is to surround the pipe
(see Figure 1, key 5+6+7+8) with one type of bedding material.7.2 Trench construction
7.2.1 General
Operations in open trenches are carried out in potentially hazardous conditions.
Where appropriate apply shore, sheet, brace, slope or other supports of the trench walls to protect any
person in the trench. When the trench is occupied take precautions:— to prevent objects from falling into the trench;
— to prevent collapse caused by the position or movements of adjacent machinery or equipment.
Excavated material should be deposited at a distance of not less than 0,5 m from the edge of the trench,
and the proximity and height of the excavated material (spoil bank) should not be allowed to endanger
the stability of the excavation.When trench supports such as sheet piling or similar is used, the pipe support and any compacted soil
around the pipe shall be maintained throughout installation. Ensure that sheeting is sufficiently tight to
prevent washing soil out of the trench wall from behind the sheeting.If trench supports are removed after the trench has been backfilled, care should be taken to not disturb
the compaction of the primary backfill material around the pipe.If it is not possible to remove trench supports without disturbing the trench compaction, it is
recommended to keep the sheeting in place to prevent loss of support of foundation and embedment
materials. Vertical and horizontal braces should be left in place. Top cross bracing may need to be
installed if the top of the sheeting is cut off to accommodate for landscaping. Sheeting that is to be left in
the trench shall be constructed of materials that will not corrode or rot, resulting in a loss of support for
the pipe.7.2.2 Trench width
The width of the trench at the springline of the pipe should not be greater than necessary to provide
adequate room for jointing the pipe in the trench and compacting the pipe zone backfill at the haunches.
The minimum trench width (see Figure 1 and 2) is given in Table 1 and Table 2.NOTE Table 1 is in compliance with the requirements of EN 1610.
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Table 1 — Minimum trench width depending on the nominal diameter (DN) of the pipe
Minimum trench width (OD + x)Nominal size (DN)
Unsupported trench
Supported trench
β ˃60° β ≤ 60°
OD + 0,40 OD + 0,40
DN ≤ 225
h h
OD + 0,50 OD + 0,50 OD + 0,40
225 < DN ≤ 350
h h h
OD + 0,70 OD + 0,70 OD + 0,40
350 < DN ≤ 700
h h h
OD + 0,85 OD + 0,85 OD + 0,40
700 < DN ≤ 1 200
h h h
OD + 1,00 OD + 1,00 OD + 0,40
DN ˃ 1 200
h h h
See Figure 2.
Key
w minimum trench width
min
a thickness of lower bedding
b thickness of upper bedding
x/2 working space next to pipe
β angle of unsupported trench
Figure 2 — Working space next to the pipe and angle of unsupported trench
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Table 2 — Minimum trench width depending on the trench depth
Minimum trench width
Trench depth (Td)
Td < 1,00 No minimum width required
1,00 ≤ Td ≤ 1,75 0,80
1,75 < Td ≤ 4,00 0,90
Td ˃ 4,00 1,00
Stability shall be ensured either by means of a trench support system, by battering the trench
sides to a stable slope which can be maintained during the works or by other suitable means. The
maximum depth of unsupported trenches with vertical trench walls shall be limited according to
national regulations and in any case less than 1,4 m.Wider trenches may be necessary for installations involving, e.g. relatively deep burial or unstable
native soils. Narrower trenches may be used when the system design permits or access by persons is
not required.Parallel piping systems laid within a common trench shall be spaced sufficiently far apart to allow
compaction equipment, if used, to compact the pipe zone backfill material between the pipes.
A clearance of at least 150 mm greater than the width of the widest piece of compaction equipment
used is considered as a practical clearance between the pipes.7.2.3 Trench depth
Determine the trench depth by the pipeline design, intended service, pipe properties, size of pipe and
local conditions such as the properties of soil and combination of static and dynamic loading.
In general, care should be taken that the depth of cover above the crown of the pipe for pipes passing
under traffic areas should usually be a minimum of 600 mm, although shallower depths may be used
when the installation is designed accordingly.When determining the trench depth, allowance for a suitable bedding should be incorporated.
Take care to ensure that the burial depth is sufficient to prevent the conveyed fluids from being affected
by frost.Sufficient cover or other suitable constructions should be provided to prevent accidental pipe flotation
in potentially high ground water areas.It is generally recommended not to dig the trench too far in advance of pipe laying and to backfill as
soon as possible after pipe laying.In frost conditions, it may be necessary to protect the trench bottom so that frozen layers are not left
under the pipe.7.2.4 Trench bottom and bedding
7.2.4.1 General
A pipe requires uniform support for the whole of its length and this is provided by the bedding layer. To
provide this uniform support, the bedding layer should in average have a minimum thickness of
100 mm and on individual places not less than 50 mm.The material used shall be granular, such as gravel, sand or crushed rock, and shall conform to 7.2.7.3
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The bedding material should be spread evenly across the full width of the trench and levelled to the
gradient of the pipeline and, if necessary, compacted.Two bedding constructions can be distinguished:
— bedding construction type 1;
— bedding construction type 2.
Bedding construction type 1 (Figure 3) may be used in all types of embedment, providing support for
the pipes over their whole barrel length, using the layer thickness requirements for a and b. This
includes any size and shape of pipes e.g. circular, non-circular, flat based. Unless specified otherwise,
the thickness of the lower bedding a, measured under the barrel, shall not be less than:
— 100 mm in usual soil conditions;— 150 mm in rock or hard soil conditions.
The thickness b of upper bedding shall be as specified in the structural design.
Bedding construction type 2 (Figure 4) may be used in uniform relatively soft fine-grained soil
providing support for the pipes over their whole barrel length. Pipes may be laid directly on the shaped,
trimmed bottom of the trench. The thickness b of upper bedding shall be as specified in the structural
design.Key
a thickness of lower bedding
b thickness of upper bedding
OD outside diameter (vertical)
Figure 3 — Bedding construction type 1
Key
b thickness of upper bedding
OD outside diameter (vertical)
Figure 4 — Bedding construction type 2
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Where necessary, holes in the lower bedding or trench bottom shall be provided to allow sufficient
space for proper assembly of the joints and products to prevent the pipe from resting on the joint or
product. The hole should not be larger than necessary to accomplish proper assembly.
The upper and lower-bedding at the trench (see Figure 1) shall be continuous, uniform and free of
particles greater than those specified in Table 3 for the applicable pipe size.Over-excavation of the trench bottom is required, when:
— rock, cobbles or hardpan are encountered;
— quick sands or similar soils, organic soils or soils are present that exhibit a volume change with a
change in moisture content may be encountered in the bottom of the trench.Each such situation shall be evaluated on a case-by-case basis during construction to determine the
extent of over-excavation and the type of foundation material to be used.Where over-excavation is performed, including accidental over-excavation during construction, it is
recommended that the material for the foundation zone shall be the same as for the bedding zone and
shall be compacted to class W (see 7.2.7.3).Compact the foundation material uniformly in accordance with 7.2.7.4.
During the installation work, trenches shall be kept free of water, e.g. rainwater, leachate, spring water,
ground water or water leakage from pipelines. The mode of drainage should not affect the pipe zone
and the pipeline.Precautions shall be taken to prevent the erosion of fine material during water control. The influence of
drainage measures on groundwater movement and the stability of the surrounding soil shall be
considered.The water level should be controlled until the embedment is installed and sufficient backfill has been
placed to prevent flotation of the pipe.After completion of the drainage measures, all construction drains should be sufficiently closed or
removed.7.2.4.2 Ground reinforcement
When settlement of the soil can be expected, such as when a pipe passes through a soil transition, the
use of geotextiles as shown in Figure 10 can provide a solution. However, where large-scale soil
movements are anticipated, this solution may not be effective. In such cases, it is recommended to seek
expert advice.Special conditions which
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