1、BRITISH STANDARD CONFIRMED JUNE 1990 BS1139-4: 1982 Metal scaffolding Part 4: Specification for prefabricated steel splitheads and trestles UDC 69.057.62034:69.057.64BS1139-4:1982 This British Standard, having been prepared under the direction of the Civil Engineering and Building Structures Standar
2、ds Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31May1982 BSI 02-1999 First published, as BS1139, November 1943 First revision November 1951 Second revision June 1964 Part third revision (Part 4) May1982 The following BSI references relate to the work on th
3、is standard: Committee reference CSB/46 Draft for comment 81/12461 DC ISBN 0 580 12702 8 Cooperating organizations The Civil Engineering and Building Structures Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Aluminium Fe
4、deration* Department of Transport Association of Consulting Engineers Federation of Civil Engineering Contractors* Brick Development Association Health and Safety Executive* British Precast Concrete Federation Ltd. Institution of Civil Engineers* British Steel Corporation Institution of Municipal En
5、gineers* British Steel Industry* Institution of Public Health Engineers Cement and Concrete Association Institution of Structural Engineers* Concrete Society Limited* Institution of Water Engineers and Consumer Standards Advisory Committee Scientists of BSI London Transport Executive Convention of S
6、cottish Local Authorities Ministry of Agriculture, Fisheries and Food County Surveyors Society National Federation of Building Trades Department of the Environment (Building Employers* Research Establishment)* National Water Council Department of the Environment Royal Institute of British Architects
7、 (Housing and Construction) Scottish Development Department Department of the Environment (PSA)* Timber Research and Development Department of the Environment (Water Association Engineering Division including Water Trades Union Congress Data Unit) The organizations marked with an asterisk in the abo
8、ve list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of Consulting Scientists Incorporated Association of Architects and Confederation of British Industry Surveyors Construction Health and Safe
9、ty Group National Association of Scaffolding Construction Industry Training Board Contractors Electricity Supply Industry in England and Prefabricated Aluminium Scaffolding Wales Manufacturers Association Amendments issued since publication Amd. No. Date of issue CommentsBS1139-4:1982 BSI 02-1999 i
10、Contents Page Foreword ii Cooperating organizations Inside front cover 1 Scope 1 2 References 1 3 Definitions 1 4 Materials 1 5 Design 1 6 Marking 2 Appendix A Method of measurement of vertical load carrying capacity 3 Figure 1 Test layout for adjustable steel trestle 4 Figure 2 Test layout for spli
11、theads 5 Table 1 Width of platform-carrying member Publications referred to Inside back coverBS1139-4:1982 ii BSI 02-1999 Foreword This Part of BS1139 is one of a series specifying requirements for the design, construction and testing of equipment for use in scaffolding, and other temporary structur
12、es. It specifies requirements for steel splitheads and trestles and was previously published as part of section 4 of BS1139:1964. BS1139 is now being published in separate Parts as follows and, on publication of Parts1 to4, BS1139:1964 will be withdrawn. Part 1: Specification for tubes for use in sc
13、affolding; Part 2: Specification for couplers, fittings and accessories for use in tubular scaffolding; 1) Part 3: Specification for prefabricated access and working towers; 1) Part 4: Specification for prefabricated steel splitheads and trestles. Further Parts will be added as the need arises. A Br
14、itish 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 British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fron
15、t cover, an inside front cover, pages i and ii, pages1to6, 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 inside front cover. 1) In course of preparation.BS1139-
16、4:1982 BSI 02-1999 1 1 Scope This British Standard specifies requirements for the design and fabrication of steel splitheads and steel trestles for use as supports for temporary platforms. 2 References The titles of the standards publications referred to in this standard are listed on the inside bac
17、k cover. 3 Definitions For the purposes of this British Standard the following definitions apply. splithead a self-supporting metal stand for supporting one end of a horizontal beam on which a working platform may be laid trestle a self-supporting metal stand incorporating one or more beams on which
18、 a working platform may be laid 4 Materials Steels used as structural members in the construction of splitheads and trestles shall comply with the requirements of the relevant BritishStandards as follows: BS4, BS970, BS1139-1, BS1449, BS1775, BS4360 and BS4848. 5 Design 5.1 General. Splitheads and t
19、restles shall comply with the requirements of 5.2 to5.6. Additionally they shall be durable enough to withstand, without significant damage, reasonable handling in normal use, in storage and in transit. Splitheads and trestles shall provide either a fixed height or a variable platform height. NOTETh
20、eir base arrangements may be of a fixed configuration, or may be folding or swivelling to aid storage, handling and transit. 5.2 Fabrication and workmanship. Welds shall be of good quality and made in accordance with BS5135. Holes shall be punched or drilled, preferably the latter. All parts shall b
21、e cleanly finished, free from cracks, surface flaws, laminations and other detrimental defects. Ends of tubes shall be cut cleanly and square with the axis of the tube. All bolts, pins and rivets shall be secured against accidental displacement. NOTEThis standard does not specify requirements for pr
22、otective finishes for splitheads and trestles but it is recommended that, if no other finish is specified, splitheads and trestles are painted. Guidance on the protection of iron and steel components may be found in BS5493 and DD24. 5.3 Dimensions. The maximum height of a splithead or trestle shall
23、not exceed3.0m. Where a means of height adjustment is provided, it shall be in increments not exceeding250mm.The means of height adjustment shall be such that when adjusted to any height within the manufacturers specified range, it shall be incapable of accidental disturbance through vibration or sh
24、ock. Pins used to support and/or adjust the height of the splithead or trestle shall be not less than9mm nominal diameter and shall be held captive to the splithead or trestle. The minimum width of a platform-carrying member shall be as given in Table 1. A stop at least30mm high shall be permanently
25、 fixed to each outer end of the platform-carrying member. Table 1 Width of platform-carrying member Splitheads shall be able to support securely two timber boards on edge, side by side, each with a minimum thickness of not less than38mm. 5.4 Stability. When assembled in accordance with the manufactu
26、rers instructions, if the base is of rectangular configuration, the least base dimensions, measured centre to centre, shall be not less than0.34 of the maximum extended height. If the base is of an equilateral triangle configuration, each base side dimension, measured centre to centre, shall be not
27、less than0.58 of the maximum extended height. 5.5 Vertical load carrying capacity. Each trestle, when erected on a level base and tested in accordance with Appendix A, shall be capable of supporting a minimum safe working load of4.5kN uniformly distributed to the top of the platform-carrying member.
28、 Each splithead, when erected on a level base and tested in accordance with Appendix A, shall be capable of supporting a minimum safe working load of6.0kN applied through a75mm wide beam. The trestles shall be deemed to comply with the requirements of this standard if the appropriate minimum load sp
29、ecified in A.1 has been reached. Designation Minimum width mm 3 board 695 4 board 925 5 board 1155BS1139-4:1982 2 BSI 02-1999 6 Marking Trestles and splitheads shall be marked in a permanent and legible manner with the following information: a) the number of this British Standard, i.e.BS1139-4*; b)
30、the suppliers name or trademark; c) the safe working load of the equipment, in kg.BS1139-4:1982 BSI 02-1999 3 Appendix A Method of measurement of vertical load carrying capacity A.1 Procedure. Erect the equipment under test such that it is extended to its maximum height and1 out of plumb (see Figure
31、 1 and Figure 2). Do not insert any wedges or packaging of any description between adjustable members in an attempt to improve the initial straightness. If tested in multiples, incline the equipment in the same direction and interconnect the tops with a load distribution member or members rigid enou
32、gh to prevent the introduction of additional bending moments into the top of the equipment under test. NOTETrestles may be tested either singly or in pairs. Splitheads may be tested either singly or in fours. Use a test load (M) of not less than2.5 times the quoted safe working load, with a minimum
33、value of11.25kN for a trestle and15kN for a splithead. Evenly divide the load between the points indicated in Figure 1 and apply it through rigid bearing pads with a length of75mm and a minimum width equal to or greater than the bearing width of the platform support member of the trestle or splithea
34、d. If necessary the bearing pads may be shaped to match the contour of the platform support member. Apply an axial compression load at a rate not exceeding5kN/min to the tops of the bearing pads, as indicated in Figure 1 and Figure 2 as appropriate, in such a manner that the top and bottom of the tr
35、estle or splithead is not restrained from lateral movement until either the equipment fails or will support no further load. A.2 Recording of results. On completion of the test, the final test load shall be recorded to the nearest0.5kN. A.3 Test report. The test report shall contain the following in
36、formation. a) Adequate information to reliably identify the equipment tested. This may be in the form of the manufacturers drawings, specially prepared sketches or extracts from trade catalogues. b) Confirmation of whether or not the equipment satisfies the material requirements of clause 4. c) Conf
37、irmation of whether or not the equipment satisfies the design requirement of clause 5, with details of the test loads achieved. d) The type of surface finish. e) Other information relevant to the test, e.g. the organization commissioning the test, the testing laboratory, the date of the test and com
38、ments on the behaviour of the equipment under test loads, including a description of failure modes and the location of any point of failure.BS1139-4:1982 4 BSI 02-1999 Figure 1 Test layout for adjustable steel trestleBS1139-4:1982 BSI 02-1999 5 Figure 2 Test layout for splitheads6 blankBS1139-4:1982
39、 BSI 02-1999 Publications referred to BS4, Structural steel sections. BS970, Wrought steels in the form of blooms, billets, bars and forgings. BS1139, Metal scaffolding. BS1139-1, Specification for tubes for use in scaffolding. BS1449, Steel plate, sheet and strip. BS1775, Steel tubes for mechanical
40、, structural and general engineering purposes. BS4360, Specification for weldable structural steels. BS4848, Hot-rolled structural steel sections. BS5135, Metal-arc welding of carbon and carbon manganese steels. BS5493, Code of practice for protective coating of iron and steel structures against cor
41、rosion. DD24, Recommendations for methods of protection against corrosion on light section steel used in building. BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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