BS-9124-2008.pdf

BS 9124:2008 Specification for steel and aluminium access cover systems with over 1 m clear opening ICS 13.060.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. © BSI 2008 ISBN 978 0 580 57176 3 The following BSI references relate to the work on this standard: Committee reference B/505 Draft for comment 07/30151811 DC Publication history First published August 2008 Amendments issued since publication Amd. no.DateText affected BS 9124:2008 Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI © BSI 2008i BS 9124:2008 Contents Foreword ii Introduction 1 1Scope 1 2Normative references 1 3Terms and definitions 2 4Materials 5 5Design 7 6Structural performance 12 7Verification 13 8Marking 16 Annexes Annex A (informative) Information to be supplied in an enquiry or order 17 Annex B (normative) Test to determine the USRV and PSRV of access cover systems 18 Annex C (normative) Guidance notes and warning notes for the installation and operation of access cover systems 22 Bibliography 24 List of figures Figure 1 Clear opening 3 Figure 2 Total clearance 3 Figure 3 Typical apparatus for the water ingress test 14 Figure 4 Typical apparatus for air-tightness test 15 Figure B.1 Test locations 19 List of tables Table 1 Polished Slip/skid Resistance Values 9 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 24, an inside back cover and a back cover. Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI BS 9124:2008 ii© BSI 2008 Foreword Publishing information This British Standard is published by BSI and came into effect on 29 August 2008. It was prepared by Technical Committee B/505, Wastewater engineering. A list of organizations represented on this committee can be obtained on request to its secretary. Relationship with other publications This standard is complementary to BS EN 124, which specifies requirements for gully tops and manhole tops with a clear opening up to and including 1 m, for use in vehicular and pedestrian areas. The 1994 edition of EN 124 does not include requirements for the slip/skid resistance of manhole tops or gully tops. However, European Commission mandate M/118 “Wastewater engineering products”, given to CEN under the EU Construction Products Directive (89/106/EEC) for a “harmonized” European Standard for manhole tops and gully tops, requires the skid resistance of covers for manhole tops to be included as a performance characteristic. This is being addressed in the current revision of EN 124:1994, to which the United Kingdom is contributing under the supervision of B/505. Accordingly B/505 gratefully acknowledges the contributions made by the Health and Safety Executive, the County Surveyors Society and the Highways Agency to the development of the provisions for slip/skid resistance in this British Standard. Information about this document For an enquiry or order to be fully understood it is essential that the manufacturer be given the information set out in Annex A. Attention is drawn to the fact that cover systems under the scope of this British Standard are intended only to facilitate access to underground chambers. Product certification/inspection/testing Users of this British Standard are advised to consider the desirability of third-party certification/inspection/ testing of product conformity with this British Standard. Users seeking assistance in identifying appropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element. Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI © BSI 20081 BS 9124:2008 Introduction Products under the scope of this British Standard are normally bespoke and so it is inappropriate for the evaluation of conformity to be verified by systematic examination of the extent to which they fulfil specified requirements. Therefore, although type tests are specified for all requirements, they fall into three categories. 1.Calculation in accordance with established method (e.g. structural performance). 2.Evaluation of a particular material or design element (e.g. slip/skid or sealing). 3.Measurement (e.g. design dimensions). Some requirements (e.g. design dimensions) are absolute, in that every product needs to conform to the specified requirement. 1 Scope This British Standard specifies requirements for access cover systems manufactured from steel or aluminium and with a clear opening greater than 1 m for installations within areas subject to pedestrian and/or slow moving vehicular traffic, for use as covers over chambers and ducts. NOTE For clear openings up to 1 m, BS EN 124 applies. This standard establishes definitions; materials; design; structural performance; technical documentation; installation and operating guidance notes; warning notes; testing requirements; verification and marking of such access cover systems. 2 Normative references The following referenced documents are indispensable for the application 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. BS EN 1991, Eurocode 1: Actions on structures BS EN 1993, Eurocode 3: Design of steel structures BS EN 1999, Eurocode 9: Design of aluminium structures BS EN 287-1, Qualification test of welders Fusion welding Part 1: Steels BS EN 287-2, Approval testing of welders for fusion welding Part 2: Aluminium and its alloys BS EN 571-1, Non-destructive testing Penetrant testing Part 1: General principles BS EN 1386, Aluminium and aluminium alloys Tread plate Specifications BS EN 1418, Welding personnel. Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials BS EN 10025, Hot rolled products of structural steels Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI BS 9124:2008 2© BSI 2008 BS EN 10056, Specification for structural steel equal and unequal angles BS EN 10088, Stainless steels BS EN 10130, Cold-rolled low-carbon steel flat products for cold forming Technical delivery conditions BS EN 10210-1, Hot finished structural hollow sections of non-alloy and fine grain steels Part 1: Technical delivery conditions BS EN 10219-1, Cold formed welded structural hollow sections of non-alloy and fine grain steels Part 1: Technical delivery conditions BS EN 13036-4, Road and airfield surface characteristics Test methods Part 4: Method for measurement of slip/skid resistance of a surface The pendulum test BS EN ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles Specifications and test methods BS EN ISO 14554, Quality requirements for welding Resistance welding of metallic materials BS EN ISO 15609, Specification and qualification of welding procedures for metallic materials Welding procedure specification DD ENV 12633, Method of determination of unpolished and polished slip/skid resistance value 3 Terms and definitions For the purpose of this standard, the following terms and definitions apply. 3.1access cover single plate capable of being removed from a frame, or hinged to a frame, allowing access to an underground chamber 3.2frame fixed part of the access cover system that houses the cover 3.3access cover system assembly of removable or hinged access cover elements supported by a removable structural frame allowing clear access to a chamber or similar 3.4access cover element constituent part of the access cover system which may include all or any of the following: the frame, the removable cover, the removable support beams, the support pockets, the hinged cover, the lift assist mechanism, the seals and the locks 3.5safety grid protective frame below an access cover or access cover element which allows visual inspection of the chamber but provides protection against falls of persons or materials 3.6clearance the gap between two adjacent access covers Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI © BSI 20083 BS 9124:2008 3.7clear opening (CO) the diameter of the largest circle that can be inscribed within the clear area of the frame NOTEThe clear opening is shown in Figure 1. 3.8total clearance the sum of the maximum individual clearances between adjacent elements of the frame and access covers in any one direction NOTE The total clearance is shown in Figure 2. Figure 1Clear opening 1 = fixed supports 2 = removable supports CO CO CO 1 CO 2 Figure 2Total clearance a = a1 + a2 a = a1 + a2 + a3 + a4 a = a1 + a2 + a3 Key a = total clearance where a1, a2, a3, a4, etc., are the individual clearances a1a2 a1a2 a3 a4 a1a2 a3 Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI BS 9124:2008 4© BSI 2008 3.9span distance between centres of adjacent supports 3.10airtight cover access cover system capable of preventing the passage of odours at normal atmospheric pressure 3.11watertight cover access cover system capable of preventing the ingress of water 3.12pressure tight cover (hydraulic surcharge) access cover system capable of resisting hydraulic pressure from within the chamber 3.13normal conditions wet, rarely dry conditions and a slightly aggressive chemical environment, i.e. normal conditions for domestic sewage and treated industrial effluent, and for most natural soils and groundwater NOTE A “wet, rarely dry” condition for concrete surfaces subject to long term water contact and a “slightly aggressive chemical environment” are defined in EN 206-1 as classes XC2 and XA1 respectively. More severe environments are also defined. If more severe conditions are expected, additional requirements for corrosion protection may be necessary, see Annex A. 3.14debris gasket integral element within the cover assembly to prevent or limit the ingress of detritus that may otherwise prevent the operation of the cover 3.15PSRV polished slip resistance value NOTE This value is also used in relation to skid resistance. 3.16USRV unpolished slip resistance value NOTE This value is also used in relation to skid resistance. 3.17macrotextured surface area of an access cover system with a distinct raised pattern or studding, which is produced by casting, rolling or machining the face of the area Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI © BSI 20085 BS 9124:2008 4 Materials 4.1General Access cover systems shall be suitable for use in normal conditions. NOTE 1 If covers are to be used in more aggressive/severe conditions, additional requirements for corrosion protection may be necessary. NOTE 2 If sealed covers are to be used in more aggressive/severe conditions, special requirements for the durability of the seal may be necessary. Access covers, frames and all structural elements shall be made from any of the following materials: a)aluminium conforming to 4.2; b)mild steel conforming to 4.3; c)stainless steel conforming to 4.4. Operating systems for lift assistance and security locks may be made from additional materials; however, such materials shall have durability and corrosion properties compatible with those of the access cover and frame. 4.2Aluminium alloy access cover systems Aluminium access cover systems for use in normal conditions shall be fabricated from aluminium EN-AW 5052 or marine grade aluminium grade 5086-H34 and 6063-T5, 6063-T6 conforming to BS EN 1386 (see Annex A). Where aluminium access cover systems are to be used in contact with other metals or cementitious materials, corrosion protection shall be applied to the aluminium surface (see 4.6.4). NOTE See BS 8118 for aluminium in contact with concrete. 4.3Mild steel access cover systems Mild steel access cover systems shall be fabricated from steel conforming to BS EN 10025, BS EN 10210-1, BS EN 10219-1, BS EN 10130 or BS EN 10056. Mild steel access cover systems shall be made resistant to corrosion in accordance with 4.6, unless specified otherwise by the purchaser (see Annex A). 4.4Stainless steel access cover systems Stainless steel access cover systems shall be fabricated from austenitic stainless steel grades 1.4301 or 1.4401, conforming to BS EN 10088. If the stainless steel surface is given a decorative finish the treatment shall not be detrimental to the corrosion or slip resistance of the stainless steel. NOTEFor normal conditions no surface corrosion protection system is required for stainless steel. Post fabrication finishing processes are permitted, providing they do not provoke corrosion. Licensed CopyChinese University of Hong Kong, 21/10/2008 04:22, Uncontrolled Copy, (c) BSI BS 9124:2008 6© BSI 2008 4.5Dissimilar metals in combination with each other Where the use of dissimilar metals in combination with each other could affect the corrosion or structural performance of an access cover system, a durable isolating medium shall be used to prevent contact of the dissimilar metals. 4.6Corrosion protection 4.6.1General Corrosion protection, where specified (see Annex A), shall apply to all access cover systems. NOTE Additional coatings may be applied for aesthetic purposes. Such coatings can give a degree of corrosion protection. 4.6.2Hot dip galvanizing (mild steel) Corrosion resistance of mild steel shall be achieved by hot dip galvanizing in accordance with BS EN ISO 1461. All sharp edges resulting from galvanizing shall be removed. After the hot dip galvanizing process it might be necessary to straighten the cover or frame, to overcome any distortion induced during the galvanizing process. This straightening process shall not affect the integrity of the coating or the structural stability of the cover. 4.6.3Weld protection of stainless steel Corrosion resistance of welds in stainless steel shall be achieved by a passivation process. Prior to passivation all parts shall be inspected for the presence of contaminants such as g