Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 1: Support units and general requirements

This document stipulates the safety requirements for the use of support units intended by the manufacturer. Examples of support units are: frame supports, chock supports, shield supports, paired frames and push-pull support systems including the components of advancing and anchoring devices which provide support functions. This document excludes fixing elements on the conveyor, coal-winning equipment, power set legs and rams, valves, hydraulic and electro-hydraulic control units, lighting and signalling facilities and other ancillary equipment.
NOTE   Some components are discussed in other parts of this series of standards.
This document applies for support units that are used at ambient temperatures between −10 °C and 60 °C.
This document also applies to support components and support accessories which are provided if the support unit is fitted with stowing equipment. This document identifies and takes account of:
-   the hazards that can possibly be induced through operation of the support units;
-   the hazardous areas and the operating conditions that can cause any type of hazard;
-   the situations that can result in hazards that cause an injury or impair health;
-   dangers that can be caused through mine gas and/or flammable dusts.
This document describes methods for reducing these hazards.
Clause 4 contains a list of the hazards discussed.
This document does not specify any additional requirements for:
-   a particularly corrosive environment;
-   risks associated with manufacturing, transport and decommissioning;
-   earthquake.
A complete hydraulic powered roof support consists of the support units (EN 1804-1:2020), legs and support rams (EN 1804-2:2020) and the hydraulic and electro hydraulic controls (EN 1804-3:2020). Each part of this multipart document addresses the safety requirements of the components mentioned in the scopes of the respective parts of this multipart series.
This document is not applicable to all support units manufactured before the date of its publication.

Maschinen für den Bergbau unter Tage - Sicherheitsanforderungen für hydraulischen Schreitausbau - Teil 1: Ausbaugestelle und allgemeine Anforderungen

Diese Europäische Norm legt die Sicherheitsanforderungen für die vom Hersteller vorgesehene bestimmungsgemäße Verwendung von Ausbaugestellen fest. Beispiele für Ausbaugestelle sind: Ausbaurahmen, Ausbauböcke, Ausbauschilde, Ausbaugespanne und Ausbauzüge einschließlich der Rückeinrichtungen und der Teile von Abspannungen, welche Ausbaufunktionen haben. Dieses Dokument schließt Anschlagelemente am Förderer, Gewinnungseinrichtungen, Stempel und Zylinder, Ventile, hydraulische und elektrohydraulische Steuerungseinrichtungen, Beleuchtungs- und Signaleinrichtungen sowie sonstige Hilfseinrichtungen aus.
ANNMERKUNG Einige Komponenten werden in anderen Teilen dieser Normenreihe behandelt.
Dieses Dokument gilt für Ausbaugestelle, die bei Umgebungstemperaturen zwischen −10 °C und 60 °C eingesetzt werden.
Diese Norm gilt darüber hinaus für Ausbauteile und Ausbauzubehör, die/das vorgesehen sind/ist, wenn das Ausbaugestell mit Versatzeinrichtungen ausgerüstet wird. Diese Norm identifiziert und berücksichtigt:
- die Gefährdungen, die womöglich durch den Betrieb von Ausbaugestellen hervorgerufen werden können;
- die Gefahrenbereiche und die Betriebsbedingungen, die irgendeine Art von Gefährdung verursachen können und
- die Situationen, die zu Gefährdungen führen können, die eine Verletzung oder Gesundheitsschädigung verursachen;
- Gefahren, die durch Grubengas und/oder brennbare Stäube verursacht werden können.
Dieses Dokument beschreibt Verfahren zur Reduzierung dieser Gefährdungen.
Abschnitt 4 enthält eine Liste der behandelten Gefährdungen.
Dieses Dokument spezifiziert keine zusätzlichen Anforderungen für:
- eine besonders korrosive Umgebung;
- Risiken bei Herstellung, Transport und Außerbetriebnahme;
- Erdbeben.
Ein kompletter hydraulischer Schreitausbau besteht aus den Ausbaugestellen (EN 1804-1:2020), Stempeln und Stützzylindern (EN 1804-2:2020) sowie den hydraulischen und elektrohydraulischen Steuerungseinrichtungen (EN 1804-3:2020). Die einzelnen Teile dieses mehrteiligen Dokuments befassen sich mit den Sicherheitsanforderungen der Komponenten, die in den Anwendungsbereichen der jeweiligen Teile dieser mehrteiligen Normenreihe genannt werden.
Dieses Dokument gilt nicht für alle Ausbaugestelle, die vor dem Datum der Veröffentlichung dieses Dokuments hergestellt wurden.

Machines pour mines souterraines - Exigences de sécurité relatives aux soutènements marchants applicables aux piles - Partie 1 : Unités de soutènement et exigences générales

Le présent document stipule les exigences de sécurité relatives à l’utilisation des unités de soutènement, telle que prévue par le fabricant. Les exemples d’unités de soutènement sont les piles à flèche, piles monoblocs, piles boucliers, piles à files et systèmes de soutènement « push pull » y compris les composants de dispositifs d’avancement et d’ancrage qui assurent le soutènement du toit. Le présent document exclut les éléments de fixation sur le convoyeur, les équipements d’abattage du charbon, les étançons et vérins à pose mécanisée, les soupapes, les unités de commande hydrauliques et électro hydrauliques, les installations d’éclairage et de signalisation et les autres équipements auxiliaires.
NOTE   Certains composants sont traités dans d’autres parties de cette série de normes.
Le présent document s’applique aux unités de soutènement qui sont utilisées à des températures ambiantes comprises entre −10 °C et 60 °C.
Le présent document s’applique également aux composants et accessoires du soutènement fournis lorsque l’unité de soutènement est munie d’équipements de remblayage. Le présent document identifie et tient compte :
-   des phénomènes dangereux pouvant potentiellement être induits par l’utilisation des unités de soutènement ;
-   des zones dangereuses et des conditions de fonctionnement susceptibles d’engendrer tout type de phénomène dangereux ;
-   des situations susceptibles d’engendrer des phénomènes dangereux pouvant entraîner des blessures ou porter atteinte à la santé ;
-   des dangers pouvant être causés par le gaz de mine (grisou) et/ou les poussières inflammables.
Le présent document décrit des méthodes permettant de réduire ces phénomènes dangereux.
L’Article 4 contient une liste des phénomènes dangereux traités.
Le présent document ne définit pas d’exigences supplémentaires concernant :
-   un milieu environnant particulièrement corrosif ;
-   les risques associés à la fabrication, au transport et à la mise hors service ;
-   les tremblements de terre.
Un soutènement marchant complet est constitué des unités de soutènement (EN 1804-1:2020), des étançons et des vérins de soutènement (EN 1804-2:2020) et des systèmes de commande hydrauliques et électro hydrauliques (EN 1804-3:2020). Chaque partie du présent document multipartie traite des exigences de sécurité des composants mentionnés dans le domaine d’application de la partie concernée.
Le présent document ne s’applique pas à toutes les unités de soutènement fabriquées avant sa date de publication.

Stroji za podzemne rudnike - Varnostne zahteve za hidravlično podporje - 1. del: Podporne enote in splošne zahteve

General Information

Status
Published
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
23-Dec-2020
Completion Date
23-Dec-2020

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SLOVENSKI STANDARD
SIST EN 1804-1:2021
01-april-2021
Nadomešča:
SIST EN 1804-1:2002+A1:2010
Stroji za podzemne rudnike - Varnostne zahteve za hidravlično podporje - 1. del:
Podporne enote in splošne zahteve
Machines for underground mines - Safety requirements for hydraulic powered roof
supports - Part 1: Support units and general requirements

Maschinen für den Bergbau unter Tage - Sicherheitsanforderungen für hydraulischen

Schreitausbau - Teil 1: Ausbaugestelle und allgemeine Anforderungen

Machines pour mines souterraines - Exigences de sécurité relatives aux soutènements

marchants applicables aux piles - Partie 1 : Unités de soutènement et exigences
générales
Ta slovenski standard je istoveten z: EN 1804-1:2020
ICS:
73.100.10 Oprema za gradnjo predorov Tunnelling and tubbing
in podzemnih železnic equipment
SIST EN 1804-1:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 1804-1:2021
---------------------- Page: 2 ----------------------
SIST EN 1804-1:2021
EN 1804-1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 73.100.10 Supersedes EN 1804-1:2001+A1:2010
English Version
Machines for underground mines - Safety requirements for
hydraulic powered roof supports - Part 1: Support units
and general requirements

Machines pour mines souterraines - Exigences de Maschinen für den Bergbau unter Tage -

sécurité relatives aux soutènements marchants Sicherheitsanforderungen für hydraulischen

applicables aux piles - Partie 1 : Unités de soutènement Schreitausbau - Teil 1: Ausbaugestelle und allgemeine

et exigences générales Anforderungen
This European Standard was approved by CEN on 25 October 2020.

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, 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1804-1:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1804-1:2021
EN 1804-1:2020 (E)
Contents Page

European foreword ............................................................................................................................................ 4

Introduction .......................................................................................................................................................... 5

1 Scope .......................................................................................................................................................... 6

2 Normative references .......................................................................................................................... 6

3 Terms and definitions ......................................................................................................................... 8

4 Safety requirements .......................................................................................................................... 10

4.1 General requirements ....................................................................................................................... 10

4.1.1 General.................................................................................................................................................... 10

4.1.2 Walkway ................................................................................................................................................. 10

4.1.3 Protection against dust ..................................................................................................................... 10

4.1.4 Protection against ejected fluids ................................................................................................... 10

4.1.5 Protection against face material spalling .................................................................................. 10

4.1.6 Lifting and pulling points ................................................................................................................. 11

4.1.7 Forepoling devices ............................................................................................................................. 11

4.2 Stability and alignment requirements ........................................................................................ 11

4.2.1 Tilt-resistance ...................................................................................................................................... 11

4.2.2 Alignment .............................................................................................................................................. 11

4.3 Design requirements ......................................................................................................................... 11

4.3.1 Yield capability .................................................................................................................................... 11

4.3.2 Behaviour when overloaded ........................................................................................................... 11

4.3.3 Eccentric loading ................................................................................................................................. 11

4.3.4 Loading resulting from caving or stowing ................................................................................. 11

4.3.5 Horizontal loading .............................................................................................................................. 12

4.3.6 Fatigue strength .................................................................................................................................. 12

4.3.7 Force transmission points of legs and cylinders ..................................................................... 12

4.4 Materials ................................................................................................................................................ 12

4.4.1 Steel.......................................................................................................................................................... 12

4.4.2 Light metal ............................................................................................................................................. 13

4.4.3 Materials other than steel ................................................................................................................ 13

4.5 Permissible stresses .......................................................................................................................... 13

4.5.1 General.................................................................................................................................................... 13

4.5.2 Calculated axial stresses .................................................................................................................. 13

4.5.3 Calculated shear stresses ................................................................................................................. 13

4.5.4 Calculated combined stresses ........................................................................................................ 14

4.5.5 Calculated weld stresses .................................................................................................................. 14

4.6 Hinge joints ........................................................................................................................................... 14

4.7 Welding ................................................................................................................................................... 14

5 Verification of the safety requirements ...................................................................................... 14

5.1 Type testing ........................................................................................................................................... 14

5.2 Series tests ............................................................................................................................................. 15

6 User information ................................................................................................................................. 16

6.1 General requirements ....................................................................................................................... 16

6.2 Handling, transport, and storage .................................................................................................. 16

6.2.1 Introduction .......................................................................................................................................... 16

6.2.2 Handling and transport .................................................................................................................... 16

6.2.3 Storage .................................................................................................................................................... 16

6.3 Installation and commissioning .................................................................................................... 17

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SIST EN 1804-1:2021
EN 1804-1:2020 (E)

6.3.1 General ................................................................................................................................................... 17

6.3.2 Installation ............................................................................................................................................ 17

6.3.3 Commissioning .................................................................................................................................... 17

6.4 Operation ............................................................................................................................................... 17

6.5 Maintenance ......................................................................................................................................... 17

6.5.1 Introduction ......................................................................................................................................... 17

6.5.2 Technical description ........................................................................................................................ 17

6.5.3 Maintenance instructions ................................................................................................................ 18

6.5.4 Fault diagnosis and correction ...................................................................................................... 18

6.5.5 Maintenance schedules .................................................................................................................... 18

6.6 Parts identification lists ................................................................................................................... 18

6.7 Marking .................................................................................................................................................. 19

6.8 Residual hazards ................................................................................................................................. 19

Annex A (normative) Tests for verification of the safety requirements and calculation ...... 20

A.1 Load tests ............................................................................................................................................... 20

A.1.1 General ................................................................................................................................................... 20

A.1.2 Single loading tests ............................................................................................................................ 21

A.1.3 Cyclic fatigue test ................................................................................................................................ 21

A.2 Testing in case of a gradient and over tipped face (caving and stowing) ....................... 23

A.3 Testing in the case of gradients of more than 30° ................................................................... 24

A.4 Testing of lifting and pulling points ............................................................................................. 24

A.5 Testing of forepoling devices ......................................................................................................... 24

A.6 Testing of power set legs, rams and hydraulic control systems for integration within

the support unit................................................................................................................................... 24

A.7 Testing the material properties .................................................................................................... 24

A.7.1 General ................................................................................................................................................... 24

A.7.2 Welding suitability ............................................................................................................................. 24

A.7.3 Yield point or 0,2 % proof stress, tensile strength, elongation at fracture ................... 24

A.7.4 Impact value ......................................................................................................................................... 24

A.8 Static calculations ............................................................................................................................... 25

A.8.1 General ................................................................................................................................................... 25

A.8.2 Load cases .............................................................................................................................................. 25

A.9 Samples for loading tests ................................................................................................................. 26

Annex B (normative) Structural testing requirements for longwall shields ............................. 39

B.1 Structural measurements ................................................................................................................ 39

B.2 Acceptance criteria ............................................................................................................................ 44

B.2.1 Plastic deformation ............................................................................................................................ 44

Annex C (informative) List of significant hazards ................................................................................ 46

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2006/42/EC aimed to be covered ............................................ 49

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SIST EN 1804-1:2021
EN 1804-1:2020 (E)
European foreword

This document (EN 1804-1:2020) has been prepared by Technical Committee CEN/TC 196 “Mining

machinery and equipment - Safety”, 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 June 2021, and conflicting national standards shall be

withdrawn at the latest by June 2021.

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 1804-1:2001+A1:2010.

The main differences between this document and EN 1804-1:2001+A1:2010 are as follows:

a) Normative references (updated);
b) List of significant hazards (revised) (see Annex C);
c) Requirements for prop anchorages (deleted);
d) Requirements for steel for welded components (updated/modified);
e) List of tests for confirmation (updated);
f) Acceptance criteria for test results (modified);
g) Measurement and criteria for deformation after the test (added);
h) Requirements for convergence test (modified);
i) Cyclic fatigue test for canopy side shield (added);
j) Figures and pictures (revised/added).

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this

document.

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, 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.
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SIST EN 1804-1:2021
EN 1804-1:2020 (E)
Introduction
This document is a type C standard, as specified in EN ISO 12100:2010.

The machinery concerned and the extent to which hazards, hazardous situations and events are covered

are indicated in the scope of this document.

This document is of relevance, in particular, for the following stakeholder groups representing the market

players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);

— health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.).

Others can be affected by the level of machinery safety achieved with the means of the document by the

above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);

— machine users/employees (e.g. trade unions, organizations for people with special needs);

— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in the case of machinery intended for use by consumers).

The above-mentioned stakeholder groups have been given the possibility to participate at the drafting

process of this document.

The machinery concerned and the extent to which hazards, hazardous situations or hazardous events are

covered are indicated in the Scope of this document.

When requirements of this type-C standard are different from those which are stated in type-A or type-B

standards, the requirements of this type-C standard take precedence over the requirements of the other

standards for machines that have been designed and built according to the requirements of this type-C

standard.

The extent to which hazards are covered is indicated in the scope of this document. When creating this

standard it was assumed that:
— only trained and qualified personnel would operate the machine;
— components for which no specific requirements have been formulated:

— have been constructed in accordance with generally accepted engineering practice and generally

accepted calculation methods;
— have been well manufactured mechanically;
— are free of defects;
— the components are kept in good operational condition;

— the implementation conditions and requirements imposed on the machine have been agreed

between manufacturer and user.
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SIST EN 1804-1:2021
EN 1804-1:2020 (E)
1 Scope

This document stipulates the safety requirements for the use of support units intended by the

manufacturer. Examples of support units are: frame supports, chock supports, shield supports, paired

frames and push-pull support systems including the components of advancing and anchoring devices

which provide support functions. This document excludes fixing elements on the conveyor, coal-winning

equipment, power set legs and rams, valves, hydraulic and electro-hydraulic control units, lighting and

signalling facilities and other ancillary equipment.
NOTE Some components are discussed in other parts of this series of standards.

This document applies for support units that are used at ambient temperatures between −10 °C and

60 °C.

This document also applies to support components and support accessories which are provided if the

support unit is fitted with stowing equipment. This document identifies and takes account of:

— the hazards that can possibly be induced through operation of the support units;

— the hazardous areas and the operating conditions that can cause any type of hazard;

— the situations that can result in hazards that cause an injury or impair health;

— dangers that can be caused through mine gas and/or flammable dusts.
This document describes methods for reducing these hazards.
Clause 4 contains a list of the hazards discussed.
This document does not specify any additional requirements for:
— a particularly corrosive environment;
— risks associated with manufacturing, transport and decommissioning;
— earthquake.

A complete hydraulic powered roof support consists of the support units (EN 1804-1:2020), legs and

support rams (EN 1804-2:2020) and the hydraulic and electro hydraulic controls (EN 1804-3:2020).

Each part of this multipart document addresses the safety requirements of the components mentioned

in the scopes of the respective parts of this multipart series.

This document is not applicable to all support units manufactured before the date of its publication.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1090-1:2009+A1:2011, Execution of steel structures and aluminium structures — Part 1: Requirements

for conformity assessment of structural components

EN 1804-2:2020, Machines for underground mines — Safety requirements for hydraulic powered roof

supports — Part 2: Power set legs and rams

EN 1804-3:2020, Machines for underground mines — Safety requirements for hydraulic powered roof

supports — Part 3: Hydraulic and electro hydraulic control systems
---------------------- Page: 8 ----------------------
SIST EN 1804-1:2021
EN 1804-1:2020 (E)

EN 1993-1-1:2005, Eurocode 3: Design of steel structures — Part 1-1: General rules and rules for buildings

EN 1993-1-8:2005, Eurocode 3: Design of steel structures — Part 1-8: Design of joints

EN 1993-1-9:2005, Eurocode 3: Design of steel structures — Part 1-9: Fatigue

EN 1993-1-10:2005, Eurocode 3: Design of steel structures — Part 1-10: Material toughness and through-

thickness properties

EN 10025-1:2004, Hot rolled products of structural steels — Part 1: General technical delivery conditions

EN 10025-2:2019, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-

alloy structural steels

EN 10025-3:2019, Hot rolled products of structural steels — Part 3: Technical delivery conditions for

normalized/normalized rolled weldable fine grain structural steels

EN 10025-4:2019, Hot rolled products of structural steels — Part 4: Technical delivery conditions for

thermomechanical rolled weldable fine grain structural steels

EN 10025-5:2019, Hot rolled products of structural steels — Part 5: Technical delivery conditions for

structural steels with improved atmospheric corrosion resistance

EN 10025-6:2019, Hot rolled products of structural steels — Part 6: Technical delivery conditions for flat

products of high yield strength structural steels in the quenched and tempered condition

EN 10204:2004, Metallic products — Types of inspection documents

EN ISO 80079-36:2016, Explosive atmospheres — Part 36: Non-electrical equipment for explosive

atmospheres — Basic method and requirements (ISO 80079-36:2016)

EN ISO 148-1:2016, Metallic materials — Charpy pendulum impact test — Part 1: Test method

(ISO 148-1:2016)

EN ISO 643:2020, Steels — Micrographic determination of the apparent grain size (ISO 643:2019,

Corrected version 2020-03)

EN ISO 6892-1:2019, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

(ISO 6892-1:2019)

EN ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk

reduction (ISO 12100:2010)

EN ISO 15614-1:2017, Specification and qualification of welding procedures for metallic materials —

Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys

(ISO 15614-1:2017, Corrected version 2017-10-01)
As impacted by EN 1993-1-1:2005/AC:2009 and EN 1993-1-1:2005/A1:2014.
As impacted by EN 1993-1-8:2005/AC:2009.
As impacted by EN 1993-1-9:2005/AC:2009.
As impacted by EN 1993-1-10:2005/AC:2009.
As impacted by EN ISO 15614-1:2017/A1:2019.
---------------------- Page: 9 ----------------------
SIST EN 1804-1:2021
EN 1804-1:2020 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 12100:2010,

EN 1804-2:2020 and EN 1804-3:2020 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
designs of hydraulic powered roof support
3.1.1
support unit

type of hydraulic powered roof support, e.g. frame support, chock support, shield support, consisting of

support components and support accessories
3.1.2
frame support

support unit in which the canopy and the base are connected to legs arranged in a line one behind the

other to form one support unit
3.1.3
chock support

support unit in which the canopy and the base are connected to legs arranged one behind the other and

side by side to form one support unit
3.1.4
shield support

support unit in which the canopy and the base are connected additionally via a goaf shield which lies

within the flow of the support bearing force
3.1.5
paired frame

at least two support units arranged side by side moving lengthwise against each other using an advancing

mechanism
3.1.6
push-pull support

at least two support units arranged one behind the other moving lengthwise against each other using an

advancing mechanism
3.2
support components
all components which lie within the flow of the support bearing force
3.2.1
canopy

single or composite support component which transfers the support bearing force to the roof

3.2.2
base

single or composite support component which transfers the support bearing force to the floor

---------------------- Page: 10 ----------------------
SIST EN 1804-1:2021
EN 1804-1:2020 (E)
3.2.3
goaf shield

support component intended to absorb and transfer, fully or partially, the support bearing force and

forces parallel to the seam between canopy and base

Note 1 to entry: It is connected to the canopy and base either directly or through a linkage. It generally shields the

face area from the waste and is therefore subjected to a load from the caved material.

3.3
support accessories

all components which do not lie within the flow of the support bearing force but which are necessary for

the functioning of the powered roof support
3.3.1
advancing mechanism
device attached to the support unit for moving the support forwards
3.3.2
sprag (flipper)
device attached to the support unit for supporting the working face
3.3.3
forepoling device
device used to protect the face area from caving materials
3.4
anchoring device

device for preventing uncontrolled movements of the conveying and extracting machines

3.5
forces
3.5.1
yield force

force produced by an actuator at the yield pressure of the pressure limitating valve, neglecting friction

3.5.2
rated force
maximum force for which the support unit or support component is designed.

Note 1 to entry: It is a calculated value which is determined from the support geometry, neglecting friction.

3.5.3
support bearing force
force borne by a support unit normal to the strata, which is a
...

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