SIST EN 1337-7:2004
(Main)Structural bearings - Part 7: Spherical and cylindrical PTFE bearings
Structural bearings - Part 7: Spherical and cylindrical PTFE bearings
This European Standard deals with the requirements for the design and manufacture of spherical and cylindrical PTFE bearings. The requirements and properties of the curved sliding surfaces are included in
EN 1337-2. Spherical and cylindrical bearings with an included angle 2 q > 60° and 2 q > 75° respectively are beyond the scope of this European Standard. (see Figure 6).
For the purpose of controlling the degree of freedom the bearings may be combined with flat sliding elements and guides according to EN 1337-2:2004 and restraining rings as per 6.3.4.
Cylindrical bearings are susceptible to unexpected moments about the transverse axis of the cylindrical surface.
Additional limitation of application to be taken into consideration is given in clause 1 of EN 1337-2:2004.
Lager im Bauwesen - Teil 7: Kalotten- und Zylinderlager mit PTFE
Diese Europäische Norm betrifft die Anforderungen an die Bemessung und die Herstellung von Kalotten- und Zylinderlagern mit PTFE. Die Anforderungen an und Eigenschaften von gekrümmten Gleitflächen sind in EN 1337-2:2004 geregelt. Kalottenlager mit einem Öffnungswinkel von 2 J > 60° und Zylinderlager mit 2 J > 75° liegen außerhalb des Anwendungsbereiches dieser Europäischen Norm (siehe Bild 6).
Zur Steuerung der Freiheitsgerade der Lagerung dürfen die Lager mit ebenen Gleitteilen und Führungen nach EN 1337-2:2004 und Arretierungsringen nach 6.3.4 kombiniert werden.
Zylinderlager sind gegen unplanmäßige Momente um die Querachse der zylindrischen Gleitfläche anfällig.
Zusätzliche in Betracht zu ziehende Anwendungsbegrenzungen sind in EN 1337-2:2004, Abschnitt 1 angegeben.
Appareils d'appui structuraux - Partie 7: Appareils d'appui cylindriques et sphériques comportant du PTFE
Le présent document européen traite des exigences relatives à la conception et à la fabrication des appareils d'appui cylindriques et sphériques comportant du PTFE . Les exigences et les propriétés se rapportant aux surfaces de glissement courbes sont décrites dans l'EN 1337-2. N'entrent pas dans le domaine d'application de la présente Norme européenne les appareils d'appui cylindriques et sphériques dont l'angle au centre (2 q ) de la surface de glissement est supérieur respectivement à 60° et à 75° (voir la Figure 6).
Dans le but de limiter le degré de liberté des appareils d'appui, il est possible de les combiner avec des éléments de glissement plans et des guides conformes à l'EN 1337-2:2004 et avec des butées annulaires conformes au 6.3.4.
Les appareils d'appui cylindriques sont sujets à des moments non prévus autour de l'axe transversal de la surface cylindrique.
Une limitation d'application supplémentaire à prendre en compte est donnée à l'Article 1 de l'EN 1337-2:2004.
Konstrukcijska ležišča - 7. del: Sferična in cilindrična PTFE ležišča
General Information
Relations
Overview
EN 1337-7:2004 - published by CEN - specifies requirements for the design and manufacture of spherical and cylindrical PTFE bearings used in structural engineering (notably bridge and building bearings). The standard covers material, design verification, manufacturing, assembly and tolerances for PTFE curved sliding surfaces and their backing plates. The detailed behaviour and properties of curved sliding surfaces are addressed in EN 1337-2. EN 1337-7 excludes bearings with very large included angles (spherical: 2φ > 60°; cylindrical: 2φ > 75°) and assumes a minimum operating temperature of −35 °C.
Key Topics and Technical Requirements
- Types covered: spherical PTFE bearings (rotation about any axis) and cylindrical PTFE bearings (rotation about one axis).
- Sliding interfaces: PTFE sheet against a hard mating surface; material combinations and friction coefficients follow EN 1337-2.
- Load capacity & verification:
- Verify compressive stress and reduced contact area to prevent loss of sliding function.
- Check for separation of sliding surfaces (serviceability limit state) - eccentricity of axial load must lie within the projected area “kernel”.
- Account for eccentricities from friction, horizontal loads and rotation (methods and examples in informative Annex A).
- Rotation capability: ensure PTFE coverage and absence of metal‑to‑metal contact under design rotations.
- Design details: backing plates with concave surfaces, PTFE sheet protrusion limits, restraining ring design (referencing pot-bearing rules where applicable).
- Manufacturing & tolerances: requirements for curved and flat sliding surfaces, assembly and measurement of PTFE protrusion.
- Conformity & CE marking: informative Annex ZA addresses CE provisions under the EU Construction Products Directive.
Practical Applications
- Design and manufacture of bridge and structural bearings that require low-friction rotational movement.
- Use where PTFE sliding layers provide bearing movement and load transfer between superstructure and substructure.
- Configurations include free bearings, guided bearings (with internal/external guides), and fixed bearings using restraining rings.
Who should use this standard
- Structural and bridge engineers specifying bearings for new designs or rehabilitation.
- Bearing manufacturers and fabricators producing PTFE spherical/cylindrical bearings.
- Contractors, inspection and maintenance teams, and conformity assessment bodies responsible for CE marking and compliance.
Related Standards
- EN 1337-1: General design rules (bearing design principles)
- EN 1337-2: Sliding elements (curved sliding surface properties and material rules)
- prEN 1337-5: Pot bearings (referenced for restraining ring/piston rules)
- Refer to Annex ZA in EN 1337-7 for CE marking guidance under the Construction Products Directive
Keywords: EN 1337-7:2004, structural bearings, spherical PTFE bearings, cylindrical PTFE bearings, PTFE bearings, design requirements, sliding surfaces, CEN, CE marking.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Structural bearings - Part 7: Spherical and cylindrical PTFE bearingsLãþDAppareils d'appui structuraux - Partie 7: Appareils d'appui cylindriques et sphériques comportant du PTFELager im Bauwesen - Teil 7: Kalotten- und Zylinderlager mit PTFE91.010.30Technical aspectsICS:SIST EN 1337-7:2004enTa slovenski standard je istoveten z:EN 1337-7:200401-junij-2004SIST EN 1337-7:2004SLOVENSKI
STANDARDSIST EN 1337-7:20011DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1337-7March 2004ICS 91.010.30Supersedes EN 1337-7:2000English versionStructural bearings - Part 7: Spherical and cylindrical PTFEbearingsAppareils d'appui structuraux - Partie 7: Appareils d'appuicylindriques sphériques comportant du PTFELager im Bauwesen - Teil 7: Kalotten- und Zylinderlager mitPTFEThis European Standard was approved by CEN on 2 January 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1337-7:2004: E
Method for calculating the eccentricities in spherical and cylindrical PTFEbearings.13Annex B (informative)
Reduced area for curved sliding surfaces.15Annex ZA (informative)
Provisions for the CE marking of cylindrical and spherical PTFE bearings (withor without flat sliding elements) under the EU Construction Products Directive.18
cylindrical PTFE surfaces.mmbmajor side of the projection in plan of cyclindrical PTFE surfaces;distance from the projected area of the curved sliding surface.mmcdimension.mmddiameter .mmeeccentricity .mmfnominal compressive strength .N/mm2hprotrusion of PTFE sheet from its recess .mmrradius of curvature .mmtthickness .mmxlongitudinal axisytransverse axiszaxis normal to the principal bearing surface3.2.3 Greek lettersarotation angle.radians
Requirements for load bearing capacityThe curved PTFE sheet shall meet the requirements given in 6.2.1 to 6.2.3 and the backing plate with concavesurface those given in 6.3.3.4.3
Requirements for rotation capabilityThe sliding surfaces shall meet the requirements given in 6.2.4 and clause 4 of EN 1337-2:2004.5 Material propertiesThe materials to be used and the properties to be verified shall be in accordance with clause 5 of EN 1337-2:2004.6 Design requirementsNOTEThis clause gives requirements for the design of components which are specific to spherical and cylindrical bearingsand which are in addition to those given in clause 6 of EN 1337-2:2004.
serviceability limit state.It shall be verified that sp ³ 0 under the characteristic combination of actions. In doing so the sliding material shallbe assumed to be linear elastic and the backing plates shall be deemed to be rigid. The condition sp ³ 0 is satisfiedwhen the total eccentricity et falls within the kernel of the projected area.For spherical bearings this condition is satisfied when:
it shall be shown that¾ the metallic surfacing mating with the PTFE material is so proportioned that it completely covers the PTFEsheet,¾ there is no contact between the upper and the lower part of the bearing or any other metallic component (seeEN 1337-1:2000, annex A).For the verification of the above conditions the increase of rotation, specified in clause 5.4 of EN 1337-1:2000, shallbe taken into account.)2(rmkSdAfN´£g)1(8Let£
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Frequently Asked Questions
SIST EN 1337-7:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Structural bearings - Part 7: Spherical and cylindrical PTFE bearings". This standard covers: This European Standard deals with the requirements for the design and manufacture of spherical and cylindrical PTFE bearings. The requirements and properties of the curved sliding surfaces are included in EN 1337-2. Spherical and cylindrical bearings with an included angle 2 q > 60° and 2 q > 75° respectively are beyond the scope of this European Standard. (see Figure 6). For the purpose of controlling the degree of freedom the bearings may be combined with flat sliding elements and guides according to EN 1337-2:2004 and restraining rings as per 6.3.4. Cylindrical bearings are susceptible to unexpected moments about the transverse axis of the cylindrical surface. Additional limitation of application to be taken into consideration is given in clause 1 of EN 1337-2:2004.
This European Standard deals with the requirements for the design and manufacture of spherical and cylindrical PTFE bearings. The requirements and properties of the curved sliding surfaces are included in EN 1337-2. Spherical and cylindrical bearings with an included angle 2 q > 60° and 2 q > 75° respectively are beyond the scope of this European Standard. (see Figure 6). For the purpose of controlling the degree of freedom the bearings may be combined with flat sliding elements and guides according to EN 1337-2:2004 and restraining rings as per 6.3.4. Cylindrical bearings are susceptible to unexpected moments about the transverse axis of the cylindrical surface. Additional limitation of application to be taken into consideration is given in clause 1 of EN 1337-2:2004.
SIST EN 1337-7:2004 is classified under the following ICS (International Classification for Standards) categories: 91.010.30 - Technical aspects. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 1337-7:2004 has the following relationships with other standards: It is inter standard links to SIST EN 1337-7:2001, oSIST prEN 1337-7:2018, oSIST prEN 1337-7:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 1337-7:2004 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC; Standardization Mandates: M/104. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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