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

Konstrukcijska ležišča - 5. del: Lončna ležišča

Lager im Bauwesen - Teil 5: Topflager

Structural bearings - Part 5: Pot bearings

91.010.30 Tehnični vidiki Technical aspects

ICS:

Ta slovenski standard je istoveten z: prEN 1337-5

oSIST prEN 1337-5:2018 en,fr,de

01-marec-2018

oSIST prEN 1337-5:2018SLOVENSKI STANDARD

iTeh STANDARD PREVIEW(standards.iteh.ai)

oSIST prEN 1337-5:2018https://standards.iteh.ai/catalog/standards/sist/f663375a-da79-4250-a720-

3686c7dd79f0/osist-pren-1337-5-2018

oSIST prEN 1337-5:2018



3686c7dd79f0/osist-pren-1337-5-2018

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM

DRAFT prEN 1337-5 January 2018 ICS 91.010.30 Will supersede EN 1337-5:2005

English Version Structural bearings - Part 5: Pot bearings Lager im Bauwesen - Teil 5: Topflager This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 167. If this draft becomes a European Standard, 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. This draft European Standard was established by CEN 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. 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 European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A L I S A T I O N E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 1337-5:2018 E




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Contents Page

European foreword ....................................................................................................................................................... 5

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

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

3 Terms, definitions, symbols and abbreviations ................................................................................... 7 3.1 Terms and definitions ................................................................................................................................... 7 3.2 Symbols ............................................................................................................................................................... 9 3.3 Abbreviations ................................................................................................................................................ 10

4 Types of pot bearings .................................................................................................................................. 10 4.1 General ............................................................................................................................................................. 10 4.2 Types of pot construction .......................................................................................................................... 11 4.3 Types of internal seal.................................................................................................................................. 12 4.3.1 General ............................................................................................................................................................. 12 4.3.2 Seals type “a” .................................................................................................................................................. 12 4.3.3 Seals type “b” .................................................................................................................................................. 13 4.3.4 Seals type “c” .................................................................................................................................................. 15 4.4 Types of piston/pot contact surface ...................................................................................................... 17

5 Material properties ..................................................................................................................................... 18 5.1 Ferrous materials ......................................................................................................................................... 18 5.2 Elastomeric materials................................................................................................................................. 18 5.3 Seal materials ................................................................................................................................................ 18 5.3.1 Seal type “a” .................................................................................................................................................... 18 5.3.2 Seal type “b” .................................................................................................................................................... 18 5.3.3 Seal type “c” .................................................................................................................................................... 18 5.4 Lubricant ......................................................................................................................................................... 19

6 Design ............................................................................................................................................................... 19 6.1 General ............................................................................................................................................................. 19 6.2 Internal seal system .................................................................................................................................... 19 6.3 Behaviour under vertical load................................................................................................................. 19 6.3.1 Contact pressure – elastomeric pad ...................................................................................................... 19 6.3.2 Deflection ........................................................................................................................................................ 20 6.4 Behaviour under horizontal load ........................................................................................................... 20 6.4.1 General ............................................................................................................................................................. 20 6.4.2 Piston/pot contact pressure .................................................................................................................... 20 6.4.3 Pot verification .............................................................................................................................................. 22 6.5 Behaviour under rotations ....................................................................................................................... 27 6.5.1 General ............................................................................................................................................................. 27 6.5.2 Restoring moment ....................................................................................................................................... 28 6.5.3 Working Life — Working life of seal due to sliding contact with pot wall............................... 29 6.5.4 Geometric criteria for required rotation ............................................................................................. 29 6.6 Combination of vertical loads and rotations — Minimum thickness ........................................ 30 6.7 Combination with other bearings or elements ................................................................................. 31 6.7.1 Combination with sliding elements ....................................................................................................... 31 6.7.2 Load distribution through components ............................................................................................... 31 6.7.3 Load transfer to the adjacent structure ............................................................................................... 31




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7 Testing .............................................................................................................................................................. 31 7.1 Restoring moment ........................................................................................................................................ 31 7.2 Determination of compression stiffness .............................................................................................. 31 7.3 Lubricant and rubber .................................................................................................................................. 31 7.4 Surface roughness of steel parts ............................................................................................................. 32

8 Manufacturing, assembly, tolerances, marking and labelling ...................................................... 32 8.1 General ............................................................................................................................................................. 32 8.2 Elastomeric pad ............................................................................................................................................. 32 8.3 Parallelism of external surfaces .............................................................................................................. 32 8.4 Fit of components ......................................................................................................................................... 32 8.4.1 Piston in pot .................................................................................................................................................... 32 8.4.2 Elastomeric pad in pot ................................................................................................................................ 32 8.5 Surface roughness ........................................................................................................................................ 33 8.6 Corrosion protection ................................................................................................................................... 33 8.7 External seal ................................................................................................................................................... 33 8.8 Lubrication ...................................................................................................................................................... 33 8.9 Sharp edges ..................................................................................................................................................... 33 8.10 Marking and labelling ................................................................................................................................. 33

9 Transport, storage and installation ....................................................................................................... 33

10 In-service inspection ................................................................................................................................... 33

11 Maintenance ................................................................................................................................................... 33

12 Assessment and verification of constancy of performance ........................................................... 34 12.1 General ............................................................................................................................................................. 34 12.2 Type Testing ................................................................................................................................................... 34 12.3 Factory production control ....................................................................................................................... 34 12.4 Assessment of the performance of the construction product ...................................................... 34

Annex A (normative) Lubricant elastomer compatibility ............................................................................. 36 A.1 Test pieces ....................................................................................................................................................... 36 A.1.1 Test pieces made of the elastomer ......................................................................................................... 36 A.1.2 Test pieces made of the internal sealing .............................................................................................. 36 A.1.3 Conditioning of the test pieces ................................................................................................................. 36 A.2 Test liquid ........................................................................................................................................................ 36 A.3 Interaction of the lubricant with the elastomer or other components of the pot

bearing .............................................................................................................................................................. 37 A.3.1 Interaction of the lubricant with the elastomer ................................................................................ 37 A.3.2 Interaction of the lubricant with other components of the pot bearing ................................... 37 A.4 Test Procedure and Details ....................................................................................................................... 37 A.4.1 General ............................................................................................................................................................. 37 A.4.2 Change of physical properties of elastomer and internal sealing material ............................ 37 A.4.3 Change of mass .............................................................................................................................................. 38 A.4.4 Change of hardness ...................................................................................................................................... 38 A.4.5 Change of physical properties in tension ............................................................................................. 38 A.5 Test report ...................................................................................................................................................... 38

Annex B (informative) Determination of compression stiffness ................................................................ 40 B.1 Determination by testing ........................................................................................................................... 40 B.1.1 General ............................................................................................................................................................. 40 B.1.2 Conditioning ................................................................................................................................................... 40 B.1.3 Testing .............................................................................................................................................................. 40 B.1.4 Analysis of the test ....................................................................................................................................... 40 B.2 Determination by calculation................................................................................................................... 41




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Annex C (normative) Determination of restoring moment ......................................................................... 42 C.1 Introduction ................................................................................................................................................... 42 C.2 Preparation of test specimens ................................................................................................................. 42 C.3 Test procedure .............................................................................................................................................. 42 C.4 Evaluation of restoring moment factors .............................................................................................. 43 C.5 Test report ...................................................................................................................................................... 44

Annex D (normative) Test equipment ................................................................................................................. 46 D.1 Compression testing machine ................................................................................................................. 46 D.2 Rotation attachment ................................................................................................................................... 46 D.3 Heating equipment (oven) ........................................................................................................................ 47 D.4 Measuring instruments .............................................................................................................................. 47

Annex ZA (informative) Relationship of this European Standard with Regulation (EU) No. 305/2011 ................................................................................................................................................. 48

ZA.1 Scope and relevant characteristics ........................................................................................................ 48 ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) ...................... 50 ZA.3 Assignment of AVCP tasks ......................................................................................................................... 50

Bibliography ................................................................................................................................................................. 55




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European foreword

This document (prEN 1337-5:2018) has been prepared by Technical Committee CEN/TC 167 “Structural bearings”, the secretariat of which is held by DIN.

This document is currently submitted to the CEN Enquiry.

This document will supersede EN 1337-5:2005.

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 Regulation 305/2011.

For relationship with EU Regulation 305/2011, see informative Annex ZA, which is an integral part of this document.

prEN 1337, Structural bearings, consists of the following 8 parts:

— Part 1: General;

— Part 2: Sliding elements;

— Part 3: Elastomeric bearings;

— Part 4: Roller bearings;

— Part 5: Pot bearings;

— Part 6: Rocker bearings;

— Part 7: Spherical and cylindrical PTFE bearings;

— Part 8: Guide bearings and Restraint bearings.

The major technical changes are listed below:

— Complete technical and editorial revision of the document; it is not possible to list all implemented changes to this edition of EN 1337-5.




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1 Scope

This document specifies rules for the design, testing and manufacture of fixed and sliding pot bearings.

It is applicable to pot bearings:

— with elastomeric pads made from natural rubber (NR) or chloroprene rubber (CR) up to 1 500 mm diameter,

— with pot and piston made from ferrous materials,

— with seals tested for different accumulated slide paths due to rotations between piston and pot of a) 500 m, b) 1 000 m or c) 2 000 m,

— with seals made from specific austenitic steel, brass, POM or carbon filled PTFE,

— subjected to operating temperature ranges between –25 °C and +50 °C or –40 °C and +50 °C,

— subjected to operating temperatures up to +70 °C for repeated periods of less than 8 h.

This document will be used in conjunction with prEN 1337-1:2018 and other relevant parts of the prEN 1337 series.

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.

prEN 1337-1:2018, Structural bearings — Part 1: General

prEN 1337-2:2018, Structural bearings — Part 2: Sliding elements

EN 1991-2, Eurocode 1: Actions on structures — Part 2: Traffic loads on bridges

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

EN 1993-2:2006, Eurocode 3 — Design of steel structures — Part 2: Steel Bridges

EN 1993 (all parts), Eurocode 3: Design of steel structures

EN 10025 (all parts), Hot rolled products of structural steels

EN 10083-3, Steels for quenching and tempering — Part 3: Technical delivery conditions for alloy steels

EN 10088-2:2014, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes

EN 10113-1, Hot-rolled products in weldable fine grain structural steels — Part 1: General delivery conditions

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

EN 12167:2016, Copper and copper alloys — Profiles and bars for general purposes




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EN ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles (ISO 527-1)

EN ISO 527-2, Plastics - Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics (ISO 527-2)

EN ISO 1133 (all parts), Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics (ISO 1133, all parts)

EN ISO 1183 (all parts), Plastics — Methods for determining the density of non-cellular plastics (ISO 1183, all parts)

EN ISO 2039-1, Plastics — Determination of hardness — Part 1: Ball indentation method (ISO 2039-1)

EN ISO 4287, Geometrical product specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters (ISO 4287)

EN ISO 4288, Geometrical product specifications (GPS) — Surface texture: Profile method — Rules and procedures for the assessment of surface texture (ISO 4288)

EN ISO 7500-1:2015, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system (ISO 7500-1:2015)

ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties

ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and 100 IRHD

ISO 1083, Spheroidal graphite cast irons — Classification

ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids

ISO 3755, Cast carbon steels for general engineering purposes

ISO 6446, Rubber products — Bridge bearings — Specification for rubber materials

ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods

3 Terms, definitions, symbols and abbreviations

3.1 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

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




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3.1.1 accumulated slide path sum of the relative movements between the internal seal and the pot wall resulting from variable rotations

3.1.2 elastomeric pad circular component which provides the rotational capability by deformation

3.1.3 external seal component or material which is used to exclude moisture and debris from the gap between the piston and the pot

3.1.4 internal seal component which prevents escape of the elastomeric material through the gap between the wall of the pot and the piston when a compressive force is applied

3.1.5 lubricant special grease used to reduce the friction between the pad and the metallic components for the purpose of reducing wear and the rotation stiffness

3.1.6 piston component which closes the open end of the recess in the pot and bears on the elastomeric pad

3.1.7 pot component with a machined circular recess which contains the elastomeric pad, piston and internal seal

3.1.8 pot bearing structural bearing consisting of an elastomeric pad (rotational element) confined in a recess by means of a close fitting piston and an internal seal

Note 1 to entry: The orientation of the bearing is not restricted.

3.1.9 restoring moment moment generated from the elastomeric pad caused by the rotation deformation

3.1.10 sliding pot bearing pot bearing combined with a sliding element to accommodate translational movements

3.1.11 slide path relative movements of internal seal to pot wall




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3.2 Symbols

For the purposes of this document, the following symbols apply:

Latin upper case letters

A cross section area mm2

dint internal diameter of pot mm

dext outer diameter of pot ring mm

E modulus of elasticity

k0 factor in restoring moment formula for zero rotation

k1 factor in restoring moment formula for lubricated pad

k2 factor in restoring moment formula for unlubricated pad

Rw resistance of weld N/mm1

Vxy resultant applied horizontal load N

h depth of the cylindrical recess mm

Mrt;exp restoring moment from pad and internal seal in test Nmm

Mrt restoring moment from pad and internal seal Nmm

Mfric additional moment from friction between piston and pot Nmm

Mtot;r total resistance moment from rotation Nmm

N axial force N

r radius of contact surface mm

tbase thickness of the pot base mm

V total transverse or shear force N

V1tot total transverse or shear force per unit length N

Vel shear force due to elastomer pressure N

T temperature

Latin lower case letters

a additional clearance for rotation

b width of piston face mm

bcal calculated piston/pot contact width mm

c factor used in slide path expression

del diameter of elastomeric pad mm

dint internal diameter of pot mm

dext outer diameter of pot ring mm




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fu ultimate strength of material N/mm2

fy yield strength of material N/mm2

fel;d design contact strength of the elastomer N/mm2

sA,d accumulated slide path

tel nominal thickness of elastomeric pad mm

w Vertical deflection mm

Greek letters

γm partial material factor

α rotation angle rad

αg resultant rotation angle due to permanent actions rad

αQ resultant rotation angle due to traffic loads rad

αrt rotation angle in restoring moment test rad

Subscripts

bot lower, bottom

d design, design value

k characteristic

R resistance

fric resulting from friction

rt restoring

top upper

tot total

E internal forces and moments from actions N, Nmm

u ultimate limit state

w weld

el elastomer

3.3 Abbreviations

PTFE polytetrafluoroethylene

POM polyoxymethylene (acetal)

4 Types of pot bearings

4.1 General

The components of a pot bearing are shown in Figure 1.




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Key 1 internal seal 2 piston 3 external seal (in this area) 4 elastomeric pad 5 pot

Figure 1 — Components of a pot bearing

The pot may be formed in various ways as shown in Figure 2. Different types of internal seal can be used. The piston can be shaped in two ways in the area of contact with the pot wall. The bearing can be used in inverted position also.

Pot bearings may be combined with sliding elements in accordance with prEN 1337-2:2018.

4.2 Types of pot construction

There are four construction types for pots (see Figure 2):

— Type a): made of a monolithic plate,

— Type b): made from a ring with a base plate welded inside,

— Type c): made from a ring welded to a base plate.

— Type d): made from a ring connected to a base plate with a recess and bolts.




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Figure 2 — Types of pot construction

4.3 Types of internal seal

4.3.1 General

The internal seals are classified with regard to the standard accumulated slide path as follows:

— Seals with accumulated slide path “a”, 500 m (see 4.3.2);

— Seals with accumulated slide path “b”, 1 000 m (see 4.3.3);

— Seals with accumulated slide path “c”, 2 000 m (see 4.3.4).

4.3.2 Seals type “a”

The stainless steel seal is classified for an accumulated sliding movement SR = c × 500 m in the structure

The sealing ring shall be made from stainless steel strip formed into an equal or unequal angle section inserted between the elastomeric pad and the pot wall with the ends overlapping. The top surface may have notches, see Figure 3.




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Figure 3 — Typical notched stainless steel seal

The sealing ring shall be made from stainless steel strip formed into an equal or unequal angle section inserted between the elastomeric pad and the pot wall.

The leg length and thickness of the section shall meet the following.

a) with notches:

where diameter del ≤ 700 mm — leg length 5 mm to 10 mm, thickness 1 mm minimum; where diameter del > 700 mm leg length 15 mm to 17 mm, thickness 1,5 mm minimum; the minimum overlap of the ring ends shall be 20 mm; where the thickness > 1 mm, the ends shall be reduced in thickness at the overlap position.

b) without notches:

minimum leg length 3 mm;

minimum thickness 1 mm;

minimum overlap 5 mm;

where the thickness > 1 mm, the ends shall be reduced in thickness at the overlap position.

4.3.3 Seals type “b”

The brass seal is classified for an accumulated sliding movement SR = c × 1 000 m in the structure.

Internal brass seals shall be fitted into a recess formed in the edge of the upper surface of the elastomeric pad and shall consist of a number of split rings formed to the internal diameter of the pot. When fitted, the gap between the ends of the ring shall not exceed 0,5 mm. The gaps in adjacent rings shall be equally disposed around the perimeter of the pot. Where possible no gap should coincide with the point of maximum rotation movement on the pot wall.

Rings with a minimum cross-section of 10 mm × 2 mm may have slits 7 mm deep, cut 0,5 mm wide spaced at 5 mm around the internal diameter to facilitate forming. Rings with a smaller cross-section shall not have slits.




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