BS 2482-2009 Specification for timber scaffold boards《木脚手架板规范》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1BS 2482:2009 Specification for timber scaffold boardsBS 2482:2009 BRITISH STANDARDPublishing and copyright inform

2、ationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2009ISBN 978 0 580 54403 3ICS 91.220The following BSI references relate to the work on this standard:Committee reference B/514/42Draft for comment 08/30113948 DCPublication historyFirst publishe

3、d May 1954First revision, February 1963Second revision, August 1970Third revision, July 1981Fourth revision, June 2009Amendments issued since publicationDate Text affected BSI 2009 iBS 2482:2009BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Types of ti

4、mber 25 Dimensions and tolerances 36 Construction 37 Timber quality 58 Factory production control 179 Marking 18AnnexesAnnex A (informative) Properties of scaffold boards 19Annex B (informative) Support centres 20Annex C (informative) Method of test for determining bending strength 21Bibliography 23

5、List of figuresFigure 1 Typical knots and groups of knots 7Figure 2 Measurement of rate of growth 13Figure 3 Measurement of slope of grain 13Figure 4 Measurement of wane 14Figure 5 Measurement of bow, spring, twist and cup for a 3.9 m board 15Figure C.1 Set-up for testing of scaffold boards 21List o

6、f tablesTable 1 Timbers for machine grading of scaffold boards, for which settings have been derived 2Table 2 Timbers for visual grading of scaffold boards 2Table 3 Target cross-sectional sizes 3Table 4 Cook Bolinder grade settings 17Table 5 Computermatic and Micromatic grade settings 17Table A.1 St

7、rength properties 19Table B.1 Target spans 20Table C.1 Ultimate moments to be achieved in load tests 22Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 24, an inside back cover and a back cover.ii BSI 2009BS 2482:2009 BRITISH STANDARDForewordPub

8、lishing informationThis British Standard is published by BSI and came into effect on 30 June 2009. It was prepared by Subcommittee B/514/42, Access and working platforms, under the authority of Technical Committee B/514, Access and support equipment. A list of organizations represented on this commi

9、ttee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 2482:1981, which is withdrawn.Information about this documentThis is a full revision of the standard, and introduces the following principal changes.a) 50 mm thick boards are no longer included within th

10、e standard.b) The method of selection of 38 mm thick boards has been revised and two grades with different maximum support centres (1.2 m and 1.5 m) are now specifi ed. c) The method of selection of 63 mm thick boards has been revised and a single grade with maximum support centres of 2.5 m is now s

11、pecifi ed.d) Annex A provides updated information on the performance characteristics of boards conforming to this standard.e) Annex B provides information on support centres, which are defi ned in terms of a target span with a setting-out allowance.Guidance on the use of scaffold boards in access sc

12、affolding is given in the National Access and Scaffolding Confederations technical guidance notes, A guide to good practice for scaffolding with tubes and fi ttings (TG20:08) 1 and also BS EN 12811 for scaffold platforms.Attention is drawn to the UK governments timber procurement policy, which requi

13、res that timber used at construction sites for all central government projects is from a legal and sustainable source. Guidance on implementation is offered by the Central Point of Expertise for Timber Procurement (CPET).1)Product certifi cation/inspection/testingUsers of this British Standard are a

14、dvised to consider the desirability of third-party certifi cation/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.Presen

15、tational conventionsThe 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”.1)Available at BSI 2009 iiiBS 2482:2009BRITISH STANDARDCommentary, explanation and general informative materia

16、l is presented in smaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis 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

17、confer immunity from legal obligations.This page deliberately left blankiv BSI 2009 BSI 2009 1BS 2482:2009BRITISH STANDARD1 ScopeThis British Standard specifies requirements for timber scaffold boards with a width of 225 mm and a thickness of either 38 mm or 63 mm.It covers board sizing, board const

18、ruction, and timber quality and grading, for which it specifies: a) two grades for 38 mm thick scaffold boards, as follows:1) 1.2 m support centre a grade that is suitable for support at centres up to 1.2 m, which may be selected by visual or machine strength grading;2) 1.5 m support centre a grade

19、that is suitable for support at centres up to 1.5 m, which may only be selected by machine strength grading.b) a single grade for 63 mm thick scaffold boards that is suitable for support at centres up to 2.5 m, which may be selected by visual or machine strength grading.This British Standard does no

20、t cover laminated or finger-jointed scaffold boards.NOTE Annex A provides information on performance characteristics. Annex B provides information on support centres.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references,

21、 only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 1706, Method for specifying electroplated coatings of zinc and cadmium on iron and steelBS 4978, Specification for visual strength grading of softwoodBS 6100-4

22、, Glossary of building and civil engineering terms Part 4: Forest productsBS 6338, Specification for chromate conversion coatings on electroplated zinc and cadmium coatingsBS EN 10143, Continuously hot-dip coated steel sheet and strip Tolerances on dimensions and shapeBS EN 13183-1, Moisture content

23、 of a piece of sawn timber Part 1: Determination by oven dry methodBS EN 13556, Round and sawn timber Nomenclature of timbers used in Europe3 Terms and definitionsFor the purposes of this British Standard, the nomenclature given in BS EN 13556, and the terms and definitions given in BS 6100-4 and th

24、e following apply.2 BSI 2009BS 2482:2009 BRITISH STANDARD3.1 scaffold boardboard intended to provide part of the support surface or platform in scaffolding when supported at appropriate centres and subjected to anticipated loadingsNOTE Alternative names include “scaffold plank” and “scaffold batten”

25、.3.2 target spansupport centres for which the grading rules for the scaffold board have been developed4 Types of timberTimbers for scaffold boards shall be selected from those specified in Table 1 or Table 2, as appropriate.Table 1 Timbers for machine grading of scaffold boards, for which settings h

26、ave been derived Standard name Botanical species Other common namesEuropeRedwood Pinus sylvestris European redwoodWhitewood Picea abies European whitewoodAbies alba European whitewoodTable 2 Timbers for visual grading of scaffold boards Standard name Botanical species Other common namesEuropeRedwood

27、 Pinus sylvestris European redwoodWhitewood Picea abies European whitewoodAbies alba European whitewoodCanadian species combinationsDouglas fi r larch Pseudotsuga menziesii Douglas fi rLarix occidentalis Western larchHem fi r Tsuga heterophylla Western hemlockAbies amabilis Amabilis fi rAbies grandi

28、s Grand fi rSpruce pine fi r Picea mariana Black sprucePicea engelmanni Engelmann spruceEastern Canadian sprucePicea rubens Red sprucePicea glauca White sprucePinus banksiana Jack pinePinus contorta Lodgepole pinePinus ponderosa Ponderosa pineAbies lasiocarpa Alpine fi rAbies balsamea Balsam fir BSI

29、 2009 3BS 2482:2009BRITISH STANDARDTable 2 Timbers for visual grading of scaffold boards (continued)Standard name Botanical species Other common namesUSASouthern yellow pine Pinus echinata Shortleaf pinePinus palustris Longleaf pinePinus elliottii Slash pinePinus taeda Loblolly pineNOTE 1 The most c

30、ommonly available timber is European whitewood.NOTE 2 This table lists those timbers known to be suitable for use for the production of scaffold boards. No attempt has been made to list timbers in such a manner as to indicate their relative strengths.5 Dimensions and tolerancesBasic cross-sectional

31、sizes, when measured at 20% moisture content in accordance with BS EN 13183-1, shall conform to Table 3.Table 3 Target cross-sectional sizesThickness Widthmm mm38 2 225 563 3 225 5It shall be assumed that the thickness and width of a board: a) increase by 0.25% for every 1% of moisture content highe

32、r than 20% up to 27%; andb) decrease by 0.25% for every 1% of moisture content lower than 20%.A finished scaffold board shall be of the length described by the supplier, with a tolerance of 25 mm, except in the case of boards of basic length greater than 3.9 m, for which the tolerance on length shal

33、l be 50 mm.NOTE 1 If more precise lengths than those specifi ed are required for system (prefabricated) scaffolds, the tolerances should be those defi ned as acceptable by the scaffold manufacturer.NOTE 2 Crosscutting is permissible as this does not affect the structural integrity of the board. For

34、visually graded boards, all defects will have been visually assessed. For machine graded boards, the board will have been mechanically assessed along its length.6 Construction6.1 GeneralThe face surface shall be sawn, edges shall be sawn or planed, and corners shall be left square. Ends shall be pro

35、tected from splitting by the use of either end bands (see 6.2) or nailplates (see 6.3), fitted in such a manner as to avoid causing injury.4 BSI 2009BS 2482:2009 BRITISH STANDARD6.2 End bands6.2.1 GeneralEnd bands shall be so finished as to avoid causing injury through sharp ends.6.2.2 38 mm thick b

36、oardsEnd bands shall be made from zinc-coated mild steel conforming to BS EN 10143, with a thickness of not less than 0.6 mm. The width of the end bands shall be not less than 20 mm and not greater than the thickness of the board. They shall extend for a minimum of 150 mm along the edge of the board

37、.The end bands shall be secured to the edge of the board along each side with:a) not fewer than two 30 mm 3.0 mm clout nails, galvanized in accordance with BS 1706 or zinc-plated and chromate-conversion-coated in accordance with BS 6338; orb) not fewer than two 1.8 mm wire 11.3 mm crown 30 mm long s

38、taples, galvanized to BS 6338 or made from stainless steel. NOTE 1 When using staples to secure the end band to the board, the crowns of the staples should be fi tted perpendicular to the edge of the board.The end bands shall be secured to the end of the board with:1) not fewer than three 30 mm 3.0

39、mm clout nails, either galvanized in accordance with BS 1706 or zinc-plated and chromate-conversion-coated in accordance with BS 6338; or2) not fewer than three 1.8 mm wire 11.3 mm crown 30 mm long staples, galvanized to BS 6338 or made from stainless steel; orNOTE 2 When using staples to secure the

40、 end band to the board, the crowns of the staples should be fi tted perpendicular to the end of the board.3) not fewer than 28 teeth, stamped or pressed from the end band in such a way that sharp strips of steel are bent from the slots to project at approximately 90 from the inner face of the band.6

41、.2.3 63 mm thick boardsEnd bands shall be made from zinc-coated mild steel conforming to BS EN 10143, with a thickness of not less than 0.6 mm. The width of the end bands shall be not less than 47 mm and not greater than the thickness of the board. They shall extend for a minimum of 100 mm along the

42、 edge of the board. BSI 2009 5BS 2482:2009BRITISH STANDARDThe end bands shall be secured to the edge of the board along each side with:a) not fewer than two 30 mm 3.0 mm clout nails, galvanized in accordance with BS 1706 or zinc-plated and chromate-conversion-coated in accordance with BS 6338; or b)

43、 not fewer than two 1.8 mm wire 11.3 mm crown 30 mm long staples, galvanized to BS 6338 or made from stainless steel. NOTE 1 When using staples to secure the end band to the board, the crowns of the staples should be fi tted perpendicular to the edge of the board.The end bands shall be secured to th

44、e end of the board with:1) not fewer than three 30 mm 3.0 mm clout nails, either galvanized in accordance with BS 1706 or zinc-plated and chromate-conversion-coated in accordance with BS 6338; or2) not fewer than three 1.8 mm wire 11.3 mm crown 30 mm long staples, galvanized to BS 6338 or made from

45、stainless steel; orNOTE 2 When using staples to secure the end band to the board, the crowns of the staples should be fi tted perpendicular to the end of the board.3) not fewer than 28 teeth, stamped or pressed from the end band in such a way that sharp strips of steel are bent from the slots to pro

46、ject at approximately 90 from the inner face of the band.6.3 NailplatesNailplates shall be made from galvanized sheet steel, by stamping or pressing a pattern of slots so that sharp strips of steel are bent from the ends of the slots to project at approximately 90 from the inner face of the plate.Th

47、e plates shall have a thickness of not less than 0.7 mm (22 gauge) with a width of not less than 27 mm and length of not less than 190 mm.There shall be not fewer than 42 teeth per plate and at least 50% of these teeth shall have a length of not less than 8 mm. At least two plates shall be attached

48、across each end of the board (one on each face) and shall be positioned within 230 mm of the end of the board.The nailplates shall be attached by being pressed into the face of the scaffold board until the upper surface of the nailplate is flush with that of the board. Before the nailplate is insert

49、ed, pressure shall be applied to the edges of the board in order to close any fissures that might be present. The size limits of fissures shall conform to 7.2.2.4.7 Timber quality7.1 GeneralTimber shall be assessed in accordance with 7.2 or 7.3, as appropriate.Both visual and machine strength grading operations shall be carried out by a competent, adequately trained and supervised person.6 BSI 2009BS 2482:2009 BRITISH STANDARDNOTE 1 If testing of sc