1、BRITISH STANDARD BS 3678:1986 Incorporating Amendment No. 1 Specification for Access hooks for chimneys and other high structures in steel UDC 697.85.014.2:692.97BS3678:1986 This British Standard, having been prepared under the directionof the Civil Engineering and Building Structures Standards Comm
2、ittee, was published under the authority ofthe Board of BSI and comesintoeffect on 31January1986 BSI 07-1999 First published October 1963 First revision October 1972 Second revision January 1986 The following BSI references relate to the work on this standard: Committee reference CSB/28 Draft for co
3、mment 84/11023 DC ISBN 0 580 14736 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Civil Engineering and Building Structures Standards Committee (CSB/-) to Technical Committee CSB/28 upon which the following bodies were represented: Ag
4、ricultural and Allied Workers National Trade Group Agricultural Engineers Association British Flue and Chimney Manufacturers Association Building Employers Confederation Department of Agriculture and Fisheries for Scotland Electronic Engineering Association Engineering Equipment and Materials Users
5、Association Health and Safety Executive Institution of Civil Engineers Institution of Structural Engineers National Federation of Master Steeplejacks and Lightning Conductor Engineers Refractory Contractors Association Suspended Access Equipment Manufacturers Association Union of Construction Allied
6、 Trades and Technicians Amendments issued since publication Amd. No. Date of issue Comments 8079 February 1994 Indicated by a sideline in the marginBS3678:1986 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Materials 1 4 Design 1 5 Const
7、ruction 1 6 Dimensions 1 7 Marking 1 8 Method of fixing 1 Appendix A General recommendations on the methods of use of access fittings 3 Figure 1 Typical access hook 2 Table 1 Dimensions for hooks 2 Publications referred to Inside back coverBS3678:1986 ii BSI 07-1999 Foreword This revision of BS3678
8、has been prepared under the direction of the Civil Engineering and Building Structures Standards Committee. It supersedes BS3678:1972 which is withdrawn. This standard is complementary to BS3572. For permanently fixed steel ladders, reference should be made to BS4211. It is recommended that the spec
9、ifier, or his representative, be permitted access to where the hooks are made in order that he may examine and sample the materials and the finished hooks. Attention is drawn to the purchasers right to require a certificate of compliance with this standard and to a possible reference to it in the co
10、ntract between supplier and purchaser. To ensure to their satisfaction that products claimed to comply with this British Standard consistently achieve the required level of quality, purchasers ordering to this standard are advised to specify in their purchasing contract that the supplier operates a
11、quality system in accordance with BS5750. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
12、 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the insid
13、e front cover.BS3678:1986 BSI 07-1999 1 1 Scope This British Standard specifies requirements for hooks that are intended to be welded permanently to chimneys and other high structures in steel to provide means of access for inspection and maintenance by steeplejacks and members of similar trades who
14、 normally fit their own ladders. The requirements specified for the hooks are in respect of materials, design, construction, dimensions and method of fixing. Recommendations on the use of access fittings are given in Appendix A. NOTE 1The attachment of the hooks specified in this standardto chimneys
15、 or other high structures made of plate less than 6mm thick is not recommended. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 access hook a hook provi
16、ded to afford access up and down or around a chimney or other high structure 2.2 steel chimney a shaft for conveying gases and constructed fromsteel plate not less than 6 mm thick (seealsoclause1) 3 Materials Hooks shall be made from steel complying with grade 070M20 of BS 970-3 or BS4360. In the no
17、rmalized condition the steel shall have a minimum tensile strength of 430N/mm 2and a maximum tensile strength of 500N/mm 2 . NOTEEither of these materials is suitable for use over the normal temperature range of working, but for exceptional use at low ambient temperatures of under 0 C, steel complyi
18、ng with grade 43E of BS4360 should be used. 4 Design The design of hooks shall be as shown in Figure 1. 5 Construction 5.1 General Hooks shall be hot forged by hand out of solid bar. 5.2 Workmanship Hooks shall pass visual examination to ensure freedom from surface defects and shall be cleanly forge
19、d in such a manner that the macroscopic flow lines follow the body outline of the hook. The whole of the shank shall be forged in one piece, integral with the hook. 5.3 Heat treatment Hooks shall be normalized after the completion of all forging operations by heating them uniformly in a furnace unti
20、l the whole of the metal has attained a temperature between 880 C and 910 C and then cooling them in still air. 6 Dimensions The main dimensions of hooks shall be as given in Table 1. NOTEOther dimensions given in Figure 1 are consequent and given for guidance only. 7 Marking Hooks shall be clearly
21、and indelibly stamped on the periphery of the shank between the two curves with the following: a) The number and date of this British Standard, i.e. BS 3678:1986 1) b) The number of the British Standard with which the material of the hook complies (seeclause 3). NOTECare should be taken that the ind
22、entation is neither too sharp nor too deep. 8 Method of fixing The hook shall be fixed to the chimney or other high structure by means of a fillet weld of 6.0mm leg size on each side of the shank and returned across the top and bottom. Before fixing, it shall be established that the chimney or struc
23、ture is constructed of material that is suitable for welding. NOTE 1For new chimneys it is recommended that the welding should be carried out in the welding shop. NOTE 2It is recommended that chimneys are in accordance with BS4076. Welding shall be in accordance with the relevant Parts of BS5135 if
24、the structure is made of steel complying with BS4360 or grade 070M20 of BS970-3. 1) Marking BS 3678:1986 or any other BS number on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of su
25、ch a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality Assurance Division, BSI, PO Box 375, Milton Keynes MK14 6LO in the case of certification marks administer
26、ed by BSI or to the appropriate authority for other certification marks.BS3678:1986 2 BSI 07-1999 After welding to the structure, a test shall be carried out by suspending from the hook, at the position shown in Figure 1, a mass of 225kg. No fracture or crack shall occur in the hook or supporting st
27、ructure. Deformations shall be within the requirements of BS4076. Table 1 Dimensions for hooks Dimension referenceletter a Description Dimension Permissible deviations mm mm A Diameter of bar 20.0 B Radii of bends in shank (inside curve) 20.0 C Length of straight portion of shank 50.0 D Horizontal d
28、istance from front end of bend in shank to beginning of curve of hook 30.0 E Horizontal distance from front end of bend in shank to inside root of curve of hook 50.0 F Vertical distance from top of horizontal portion of shank to top of hook 58.0 a As shown in Figure 1 + 1.5 0 + 1.5 0 + 6.0 0 + 6.0 0
29、 + 6.0 0 + 6.0 0 Figure 1 Typical access hookBS3678:1986 BSI 07-1999 3 Appendix A General recommendations on the methods of use of access fittings The use of access fittings inside chimneys or other structures exposed to corrosive gases is not recommended. Hooks are to be used for the temporary atta
30、chment of ladders, and the occasional lifting of light loads, only. A pulley is sometimes rigged from the top of a steeplejacks ladder for the purpose of lifting small loads, principally of materials such as mortar for use in maintenance of the structure. It is important that such loads should be ke
31、pt as light as possible and in no circumstances should any single load exceed 55kg. The practice of fitting painters pulleys and stepirons to steel shafts is strongly deprecated. NOTEAttention is drawn to the requirements of appropriate sections of the Factories Act 1961, The Health and Safety at Wo
32、rk etc. Act 1974 and the Construction Regulations 1961 and 1966. For Northern Ireland the corresponding Acts are: Factories Act (Northern Ireland) 1965, The Health and Safety at Work (Northern Ireland) Order 1978, and the Construction Regulations (Northern Ireland) 1963 and 1967. It is recommended t
33、hat one vertical line of hooks beprovided. The hooks should be spaced at multiples of 1.5m vertical centres with a local tolerance of + 50mm, which will accommodate the majority of the various lengths of ladder used by steeplejacks. In order to accommodate ladders 3, 4.5, or 5m in length the first h
34、ook should be 1.2m +50, p 0mm above access level.4 blankBS3678:1986 BSI 07-1999 Publications referred to BS 970, Specification for wrought steels for mechanical and allied engineering purposes. BS 970-3, Bright bars for general engineering purpose. BS 3572, Specification for access fittings for chim
35、neys and other high structures in concrete or brickwork 2) . BS 4076, Specification for steel chimneys. BS 4211, Steel ladders for permanent access 2) . BS 4360, Specification for weldable structural steels. BS 5135, Specification for process of arc welding of carbon and carbon manganese steels. BS
36、5750, Quality systems 2) . 2) Referred to in the foreword only.BS 3678:1986 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international
37、 level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be
38、 grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service
39、 called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for internationa
40、l standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical
41、Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive subs
42、tantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the internationalst
43、andardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not
44、preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
