SIST EN 1295-1:2019
(Main)Structural design of buried pipelines under various conditions of loading - Part 1: General requirements
Structural design of buried pipelines under various conditions of loading - Part 1: General requirements
This document specifies the requirements for the structural design of water supply pipelines, drains
and sewers, and other water industry pipelines, whether operating at atmospheric, greater or lesser
pressure.
In addition, this document gives guidance on the application of the nationally established methods of
design declared by and used in CEN member countries at the time of preparation of this document.
This guidance is an important source of design expertise, but it cannot include all possible special cases,
in which extensions or restrictions to the basic design methods may apply.
Since in practice precise details of types of soil and installation conditions are not always available at
the design stage, the choice of design assumptions is left to the judgement of the engineer. In this
connection the guide can only provide general indications and advice.
This document specifies the requirements for structural design and indicates the references and the
basic principles of the nationally established methods of design (see Annexes A and B).
Statische Berechnung von erdverlegten Rohrleitungen unter verschiedenen Belastungsbedingungen - Teil 1: Allgemeine Anforderungen
Diese Norm legt Anforderungen für die statische Berechnung von Rohrleitungen für die Wasserversorgung, für Abwasserkanäle und -leitungen und andere in der Wasserwirtschaft verwendete Leitungen fest, die mit atmosphärischem oder einem höheren oder niedrigeren Druck betrieben werden.
Zusätzlich enthält diese Norm Anleitungen zur Anwendung der zum Zeitpunkt der Erarbeitung dieser Norm in den CEN-Mitgliedsländern national eingeführten Berechnungsverfahren.
Diese Anleitungen sind eine wichtige Quelle konstruktiver Erkenntnisse, können jedoch nicht alle möglichen Sonderfälle berücksichtigen; in solchen Fällen können Erweiterungen oder Einschränkungen der grundlegenden Berechnungsverfahren gelten.
Da in der Praxis zum Zeitpunkt der Berechnung nicht immer genaue Einzelheiten bezüglich der Boden- und Einbaubedingungen vorliegen, bleibt die Wahl der Berechnungsannahmen dem Ermessen des Planers überlassen. In diesem Zusammenhang können diese Anleitungen nur allgemeine Anhaltspunkte und Empfehlungen geben.
Dieser Teil der Norm enthält die Anforderungen für die statische Berechnung und verweist auf die Quellen sowie die Grundlagen der national eingeführten Berechnungsverfahren (siehe Anhänge A und B).
Calcul de résistance mécanique des canalisations enterrées sous diverses conditions de charge - Partie 1: Prescriptions générales
La présente Norme européenne spécifie les prescriptions pour le calcul de résistance mécanique des conduites d’alimentation en eau, des canalisations d’évacuation et d’assainissement et autres tuyaux de l’industrie de l’eau, fonctionnant soit à la pression atmosphérique, soit à des pressions supérieures ou inférieures.
En outre, la présente Norme européenne donne des indications pour l’application des méthodes de calcul nationalement reconnues, déclarées et utilisées dans les États membres du CEN au moment de sa préparation.
Ce guide est une source importante d’expertise sur le calcul de résistance mécanique, mais il ne peut inclure tous les cas spéciaux, pour lesquels des extensions ou des restrictions des méthodes de calcul de base peuvent s’appliquer.
Puisque dans la pratique des détails précis sur les types de sols et sur les conditions de pose ne sont pas toujours connus au stade du projet, le choix des hypothèses du projet est laissé à l’appréciation de l’ingénieur. De ce fait, le guide peut seulement donner des indications et des conseils généraux.
La présente Norme européenne spécifie les prescriptions pour le calcul structurel et indique les références et les principes de base des méthodes de calcul nationalement reconnues (voir Annexes A et B).
Projektiranje vkopanih cevovodov pri različnih pogojih obremenitve - 1. del: Splošne zahteve
Ta dokument določa zahteve za konstrukcijsko zasnovo vodovodnih cevi, odtokov in kanalizacije ter drugih industrijskih vodovodnih cevi, ki delujejo pri atmosferskem, večjem ali manjšem tlaku.
Poleg tega ta dokument podaja smernice za uporabo nacionalnih postopkov načrtovanja, ki so jih v času priprave tega dokumenta razglasile in jih uporabljajo države članice CEN.
Te smernice so pomemben vir strokovnega znanja o načrtovanju, vendar ne morejo vključevati vseh možnih posebnih primerov, v katerih se lahko uporabljajo razširitve ali omejitve osnovnih metod načrtovanja.
Ker v praksi podrobnosti o vrsti tal in pogojih namestitve niso vedno na voljo že v fazi načrtovanja, je izbira predpostavk pri načrtovanju prepuščena presoji inženirja. Zato lahko ta priročnik podaja samo splošne smernice in nasvete.
Ta dokument določa zahteve za konstrukcijsko zasnovo in podaja reference in osnovna načela nacionalnih postopkov načrtovanja (glej dodatka A in B).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 1295-1:2019
01-julij-2019
Nadomešča:
SIST EN 1295-1:1998
Projektiranje vkopanih cevovodov pri različnih pogojih obremenitve - 1. del:
Splošne zahteve
Structural design of buried pipelines under various conditions of loading - Part 1: General
requirements
Statische Berechnung von erdverlegten Rohrleitungen unter verschiedenen
Belastungsbedingungen - Teil 1: Allgemeine Anforderungen
Calcul de résistance mécanique des canalisations enterrées sous diverses conditions de
charge - Partie 1: Prescriptions générales
Ta slovenski standard je istoveten z: EN 1295-1:2019
ICS:
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST EN 1295-1:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 1295-1:2019
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SIST EN 1295-1:2019
EN 1295-1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2019
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN 1295-1:1997
English Version
Structural design of buried pipelines under various
conditions of loading - Part 1: General requirements
Calcul de résistance mécanique des canalisations Statische Berechnung von erdüberdeckten
enterrées sous diverses conditions de charge - Partie 1: Rohrleitungen unter verschiedenen
Prescriptions générales Belastungsbedingungen - Teil 1: Allgemeine
Anforderungen
This European Standard was approved by CEN on 14 January 2019.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1295-1:2019 E
worldwide for CEN national Members.
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EN 1295-1:2019 (E)
Contents
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
3.1 Installation terms . 7
3.2 Design terms . 9
4 Requirements . 9
5 Basis of design procedures . 10
5.1 General . 10
5.2 External loads . 10
5.3 Limit states . 11
5.4 Longitudinal effects . 11
6 Additional considerations for pressure pipelines . 11
6.1 General . 11
6.2 Stresses and strains resulting from simultaneous loads . 12
6.3 Effect of pressure on deformation . 12
6.4 Buckling of pressure pipes . 12
6.5 Thrusts and longitudinal stresses . 13
7 Influence of construction procedures . 13
7.1 General . 13
7.2 Trenching procedures . 13
7.3 Pipe bedding . 13
7.4 Filling procedures . 14
8 Design philosophies and factors of safety . 14
Annex A (informative) Pipe definition according to cross-sectional behaviour . 15
Annex B (informative) Nationally established methods of design . 16
B.1 Identification of methods and addresses where they are available . 16
B.1.1 Austria . 16
B.1.2 Belgium . 16
B.1.3 Denmark . 16
B.1.4 Finland . 17
B.1.5 France . 17
B.1.6 Germany . 18
B.1.7 Netherlands . 18
B.1.8 Norway . 19
B.1.9 Poland. 19
B.1.10 Spain . 19
B.1.11 Sweden . 20
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B.1.12 Switzerland . 20
B.1.13 United Kingdom . 21
B.2 Description of methods . 21
B.2.1 Austria . 21
B.2.1.1 Application . 21
B.2.1.2 Basic input data . 21
B.2.1.3 Structural design . 21
B.2.1.4 Loading . 21
B.2.1.5 Types of pipes . 22
B.2.1.6 Method of calculation . 22
B.2.1.7 Required analysis . 22
B.2.2 Belgium. 23
B.2.2.1 Application . 23
B.2.2.2 Basic input data . 23
B.2.2.3 Structural design . 23
B.2.2.4 Loading . 23
B.2.2.5 Type of pipes . 23
B.2.2.6 Method of calculation . 23
B.2.2.7 Safety factors . 24
B.2.3 Denmark . 24
B.2.3.1 Loads . 24
B.2.3.2 Safety . 25
B.2.3.3 Partial safety factors . 26
B.2.3.4 Calculations. 26
B.2.4 Finland . 26
B.2.5 France . 26
B.2.6 Germany . 27
B.2.7 Netherlands . 28
B.2.8 Norway. 28
B.2.8.1 Design of rigid pipes according to internal reports 1521 and 1554 . 28
B.2.8.1.1 Earth load . 28
B.2.8.1.2 Traffic load . 29
B.2.8.2 Design of buried plastic pipes according to VAV P 70 (Swedish standard) . 29
B.2.9 Poland . 29
B.2.9.1 Classification of pipes . 29
B.2.9.2 Limit states considered . 29
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B.2.9.3 Assessment of loads . 29
B.2.9.4 Design of buried pipes . 29
B.2.9.5 Nomographs for simplified design . 30
B.2.10 Spain . 30
B.2.10.1 Concrete pipes. 30
B.2.10.2 Plastic pipes . 30
B.2.11 Sweden . 30
B.2.11.1 Design of buried plastics pipes according to Svenskt Vatten P92 . 30
B.2.11.1.1 Soil load . 30
B.2.11.1.2 Traffic load . 31
B.2.11.1.3 Short-term deflection . 31
B.2.11.1.4 Long-term deflection . 31
B.2.11.1.5 Strain . 31
B.2.11.1.6 Buckling . 31
B.2.11.1.7 Nomographs for simplified design . 31
B.2.11.2 Design of rigid pipes according to Svenskt Vatten P99 . 31
B.2.11.2.1 General. 31
B.2.11.2.2 The vertical loads considered are: . 32
B.2.11.2.3 Horizontal loads . 32
B.2.12 Switzerland . 32
B.2.13 United Kingdom . 32
B.2.13.1 Classification of pipes . 32
B.2.13.2 Design aids . 32
B.2.13.3 Assessment of loads . 33
B.2.13.4 Limit states considered . 33
B.2.13.5 Factors of safety . 33
Bibliography . 34
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SIST EN 1295-1:2019
EN 1295-1:2019 (E)
European foreword
This document (EN 1295-1:2019) has been prepared by Technical Committee CEN/TC 165 “Waste
water engineering”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2019, and conflicting national standards shall
be withdrawn at the latest by October 2019.
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 EN 1295-1:1997.
The principal change in this revision is the following:
a) Annex B “Nationally established methods of design” has been updated.
This standard is intended for use in conjunction with the series of product standards covering pipes of
various materials for the water industry.
This standard comprises two parts:
— Part 1, General requirements: it deals with the requirements for structural design of pipelines and
gives the basic principles of the nationally established methods of design;
— Part 2, Summary of the nationally established methods of design: it gives an overview of these
methods as prepared by the various countries where they are in use.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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EN 1295-1:2019 (E)
Introduction
The structural design of buried pipelines constitutes a wide ranging and complex field of engineering,
which has been the subject of extensive study and research, in many countries over a period of very
many years.
Whilst many common features exist between the design methods which have been developed and
established in the various member countries of CEN, there are also differences reflecting such matters
as geological and climatic variations, as well as different installation and working practices.
In view of these differences, and of the time required to develop a common design method which would
fully reflect the various considerations identified in particular national methods, a two stage approach
has been adopted for the development of this European Standard.
In accordance with this two stage approach, the Joint Working Group, at its initial meeting, resolved
“first to produce an EN giving guidance on the application of nationally established methods of
structural design of buried pipelines under various conditions of loading, whilst working towards a
common method of structural design”. This standard represents the implementation of the first part of
that resolution.
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SIST EN 1295-1:2019
EN 1295-1:2019 (E)
1 Scope
This document specifies the requirements for the structural design of water supply pipelines, drains
and sewers, and other water industry pipelines, whether operating at atmospheric, greater or lesser
pressure.
In addition, this document gives guidance on the application of the nationally established methods of
design declared by and used in CEN member countries at the time of preparation of this document.
This guidance is an important source of design expertise, but it cannot include all possible special cases,
in which extensions or restrictions to the basic design methods may apply.
Since in practice precise details of types of soil and installation conditions are not always available at
the design stage, the choice of design assumptions is left to the judgement of the engineer. In this
connection the guide can only provide general indications and advice.
This document specifies the requirements for structural design and indicates the references and the
basic principles of the nationally established methods of design (see Annexes A and B).
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply (see also Annex A).
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Installation terms
The same définitions apply for trenches with vertical or sloping sides and pipes laid below
embankements. Some of these terms are illustrated in Figure 1.
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EN 1295-1:2019 (E)
Key
1 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
6 sidefill a thickness of lower bedding
7 upper bedding b thickness of upper bedding
8 lower bedding c thickness of initial backfill
9 trench bottom OD is the vertical outside diameter
v
NOTE The terms in Figure 1 are the same as in EN 1610.
Figure 1 — Trench installation
3.1.1
compaction
deliberate densification of soil during the construction process
3.1.2
consolidation
time-dependent densification of soil by processes other than those deliberately applied during
construction
3.1.3
embedment
fill around the pipe including bedding, sidefill and initial backfill
Note 1 to entry: it is the part of the trench which contributes to the structural performance of the buried pipeline.
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EN 1295-1:2019 (E)
3.2 Design terms
3.2.1
bedding factor
ratio of the maximum design load for the pipe, when installed with a particular embedment, to the test
load which produces the same maximum bending moment
3.2.2
design pressure
DP
maximum operating internal pressure of the system or of the pressure zone fixed by the designer
considering future developments but excluding surge
3.2.3
load bearing capacity
load per unit length that a particular combination of pipe and embedment can sustain without
exceeding a limit state
3.2.4
maximum design pressure
MDP
maximum operating internal pressure of the system or of the pressure zone fixed by the designer
considering future developments and including surge, where:
— MDP is designated MDPa when there is a fixed allowance for surge;
— MDP is designated MDPc when the surge is calculated
3.2.5
silo effect
effect whereby lateral earth pressure in trench backfill causes friction at the trench wall to carry part of
the weight of the backfill
3.2.6
soil-structure interaction
process whereby the deformations of soil and/or pipe caused by the contact and reaction pressures
between a pipe and the surrounding soil distribute the pressures to achieve equilibrium
3.2.7
system test pressure
STP
hydrostatic pressure applied to a newly laid pipeline in order to ensure its integrity and tightness
4 Requirements
4.1 All pipelines shall be designed to withstand the various loadings to which they are expected to be
subjected, during construction and operation, without detriment to their function and to the
environment.
4.2 The future owner of the pipeline is free to specify the appropriate method of design to be
adopted.
4.3 The designer shall determine whether or not the pipeline comes within the scope of the methods
covered by this European Standard.
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4.4 The design adopted shall be such that construction may be carried out safely and so as to ensure
that the design assumptions regarding the influence of construction procedures and soil characteristics
will be satisfied.
4.5 Subject to the other requirements of Clause 4, design should be carried out preferably using in its
entirety one of the methods in Annex B of this European Standard.
4.6 Methods of design, in accordance with Annex B, when presented in the form of tables, charts or
computer programmes shall be deemed equivalent to a full calculation, provided that any simplification
does not reduce the level of safety below that which would be obtained by full design. Outputs from
computer programmes shall be capable of verification.
4.7 Whichever the design method used, the designer shall satisfy himself that the method constitutes
a coherent system and provides the accepted level of safety.
4.8 Account shall be taken of the probable consequences of pipeline failure in establishing the
acceptable level of safety.
4.9 The values adopted for all variables, including factors of safety, shall be in accordance with the
method used.
5 Basis of design procedures
5.1 General
Whilst there are differences between some of the established national design procedures, there are no
differences in respect of the fundamental basis of design, which is the interactive system consisting of
the pipe and the surrounding soil.
The external loadings to be considered shall include that due to the backfill, that due to the most severe
surface surcharge or traffic loading likely to occur, and those due to any other causes, producing a
loading of significant magnitude such as self-weight of the pipe and water weight, as appropriate. The
internal pressure in the pipeline, if different from atm
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