1、BSI Standards PublicationBS 1139-6:2014Metal scaffolding Part 6: Prefabricated tower scaffoldsoutside the scope of BS EN 1004, bututilizing components from suchsystems SpecificationPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas
2、last issued. The British Standards Institution 2014Published by BSI Standards Limited 2014ISBN 978 0 580 83646 6ICS 91.220The following BSI references relate to the work on this document:Committee reference B/514/24Draft for comment 14/30286613 DCPublication historyFirst published December 2005Secon
3、d (present) edition, December 2014Amendments issued since publicationDate Text affectedBS 1139-6:2014 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 General Requirements 135 Materials 136 Dimensions 137 Structural design 208 Verification 239 Markings 2
4、410 Information to be supplied with a prefabricated tower scaffold 25Bibliography 27List of figuresFigure 1 Example of a cantilever tower scaffold 2Figure 2 Example of a large deck tower scaffold 3Figure 3 Example of a linked tower scaffold 4Figure 4 Example of a linked tower scaffold with bridge de
5、cks 5Figure 5 Example of a stepped tower scaffold 6Figure 6 Example of a high clearance frame 7Figure 7 Example of a walk through end frame at ground level 8Figure 8 Example of a step through end frame 8Figure 9 Example of a portal end frame 9Figure 10 Examples of bridge beams 10Figure 11 Example of
6、 a prefabricated tower scaffold cantilever platform 11Figure 12 Example showing a prefabricated tower scaffold of 2 bay lengths inElevation A and 3 bays width in Elevation B 12Figure 13 Minimum clear height and width of a high clearance frame on thehighway for the passage of the general public 14Fig
7、ure 14 Minimum clear height and width of a walk through end frame forwalk through frames not intended for use on the highway for the passage ofthe general public 15Figure 15 Minimum clear height and width for walk through end frames onthe highway for the passage of the general public 16Figure 16 Min
8、imum clear width for step through end frames 17Figure 17 Minimum clear width and height for portal end frames 18Figure 18 Maximum vertical distance between platforms used for assembly anddismantling 19List of tablesTable 1 Dimensions for portal end frames 17Table 2 Load classes 21Summary of pagesThi
9、s document comprises a front cover, an inside front cover, pages i to ii,pages 1 to 28, an inside back cover and a back cover.BRITISH STANDARD BS 1139-6:2014 The British Standards Institution 2014 iForewordPublishing informationThis part of BS 1139 is published by BSI Standards Limited, under licenc
10、e fromThe British Standards Institution, and came into effect on 31 December 2014. Itwas prepared by Subcommittee B/514/24, Access towers, under the authority ofTechnical Committee B/514, Access and support equipment. A list oforganizations represented on these committee can be obtained on request t
11、otheir secretary.SupersessionThis part of BS 1139 supersedes BS 1139-6:2005, which is withdrawn.Relationship to other standardsThis part of BS 1139 should be read in conjunction with, and is complementaryto, BS EN 1004, Mobile access and working towers made of prefabricatedelements Materials, dimens
12、ions, design loads, safety and performancerequirements.Information about this documentThis is a full revision of the standard and introduces the following principalchanges: clarification of the scope; updated terms and definitions; dimensions for certain components; new requirements for structural d
13、esign and positional stability; new requirements for design verification; new requirements for marking and for the information to be supplied.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the
14、principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Requirements in this standard are drafted in accordance with The BSI guide tostandardization Section 2: Rules for the structure,
15、 drafting and presentation ofBritish Standards, subclause 11.3.1, which states, “Requirements should beexpressed using wording such as: When tested as described in Annex A, theproduct shall .”. This means that only those products that are capable ofpassing the specified test will be deemed to confor
16、m to this standard.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Attention is drawn to the Work at Height Regulations 2005 1.Compliance with a British Standard cannot confe
17、r immunity from legalobligations.BRITISH STANDARDBS 1139-6:2014ii The British Standards Institution 20141 ScopeThis part of BS 1139 specifies requirements for the structural design ofprefabricated tower scaffolds utilizing components from mobile access andworking towers specified in BS EN 1004 but i
18、n configurations that are outside ofthe scope of that standard.These configurations include:a) prefabricated tower scaffolds outside the height limits of BS EN 1004;b) towers with more than one working platform;c) large deck tower scaffolds;d) linked tower scaffolds;e) cantilever tower scaffolds;f)
19、stepped tower scaffolds;g) tower scaffolds used as a means of access;h) towers built on base plates instead of castors.This British Standard applies to prefabricated tower scaffolds subject to windloads up to and including 0.1 kN/m2.NOTE Where a prefabricated tower scaffold might be subject to wind
20、in excess of0.1 kN/m2, and it cannot be dismantled or moved to avoid these winds, suitablewind design criteria can be found in BS EN 1991-1-4.This British Standard does not cover prefabricated tower scaffolds using guys asa method of stabilization.2 Normative referencesThe following referenced docum
21、ents are indispensable for the application ofthis document. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including anyamendments) applies.BS EN 74 (all parts), Couplers, spigot pins and baseplates for use in falseworkand
22、scaffoldsBS EN 1004, Mobile access and working towers made of prefabricated elements Materials, dimensions, design loads, safety and performance requirementsBS EN 1298, Mobile access and working towers Rules and guidelines for thepreparation of an instruction manualBS EN 1999-1-1, Eurocode 9: Design
23、 of aluminium structures Part 1-1: Generalstructural rulesBS EN 12811-2, Temporary works equipment Part 2: Information on materialsBRITISH STANDARD BS 1139-6:2014 The British Standards Institution 2014 13 Terms and definitionsFor the purposes of this part of BS 1139 the terms and definitions given i
24、nBS EN 1004 together with the following apply.NOTE The figures in this clause are not working drawings.3.1 prefabricated tower scaffoldstructure made up from prefabricated components which have their dimensionsfixed by the design and which are used in mobile access and working towersspecified in BS
25、EN 1004 but in one or more configurations that are outside thescope of that standard. It might be:a) be rendered moveable by the fitting of castor wheels or other mobilitydevices in contact with the supporting surface at the base, or be renderedstatic by the fitting of base plates in contact with th
26、at surface;b) be structurally self-supporting and/or self-stabilized, or be structurallysupported and/or stabilised by:1) securing it to an adjacent supporting structure;2) using other methods which provide the required strength and stability;c) have one or more working platforms and intermediate ac
27、cess platforms3.2 prefabricated tower scaffold configurations3.2.1 cantilever tower scaffoldprefabricated tower scaffold with one or more projecting working platformsNOTE See Figure 1 for an example.Figure 1 Example of a cantilever tower scaffoldBRITISH STANDARDBS 1139-6:20142 The British Standards
28、Institution 20143.2.2 large deck tower scaffoldassembly of adjoining prefabricated tower scaffolds connected together laterallyat their ends and sidesNOTE 1 See Figure 2 for an example.NOTE 2 Large deck tower scaffolds are also known as birdcage towers or boxingring towers.Figure 2 Example of a larg
29、e deck tower scaffoldBRITISH STANDARD BS 1139-6:2014 The British Standards Institution 2014 33.2.3 linked tower scaffoldassembly of adjoining prefabricated tower scaffolds connected together laterallyat their ends or sides either by the sharing of end frames, or by the use ofbridge decks or bridge b
30、eamsNOTE 1 See Figure 3 and Figure 4 for examples.NOTE 2 Linked tower scaffolds are also known as faade towers.NOTE 3 See 3.3.6 for definition of bridge beam and 3.3.7 for definition of bridgedeck.Figure 3 Example of a linked tower scaffoldBRITISH STANDARDBS 1139-6:20144 The British Standards Instit
31、ution 2014Figure 4 Example of a linked tower scaffold with bridge decksBRITISH STANDARD BS 1139-6:2014 The British Standards Institution 2014 53.2.4 stepped tower scaffoldprefabricated tower scaffold where the bases at the opposite ends of the towerare at different heightsNOTE Figure 5 shows an exam
32、ple of a stepped tower scaffold a tower built on astaircase.Figure 5 Example of a stepped tower scaffold3.2.5 high level tower scaffoldprefabricated tower scaffold of any configuration where the uppermostplatform is:a) more than 12 m from the ground when the tower is not subject to windforces or;b)
33、more than 8 m from the ground when the tower is subject to wind forcesNOTE Prefabricated tower scaffolds indoors might also be subject to wind forces.BRITISH STANDARDBS 1139-6:20146 The British Standards Institution 20143.3 prefabricated tower components3.3.1 base platecomponent secured to the base
34、of a prefabricated tower scaffold to provide asupport on the ground when movement of the tower is not required3.3.2 high clearance framecomponent which is installed at the base of a prefabricated tower scaffold andwhich provides unrestricted passage through the width of the tower at groundlevel or t
35、o span obstructionsNOTE 1 See Figure 6 for an example.NOTE 2 High clearance frames are also known as goalpost frames.Figure 6 Example of a high clearance frame3.3.3 walk through end framecomponent which provides unrestricted passage through the end frames of atowerNOTE 1 See Figure 7 for an example.
36、BRITISH STANDARD BS 1139-6:2014 The British Standards Institution 2014 7NOTE 2 Walk through end frames are also known as pavement frames.Figure 7 Example of a walk through end frame at ground level3.3.4 step through end framecomponent which provides passage between the ends of adjoined towers at the
37、uppermost platform levelNOTE See Figure 8 for an example.Figure 8 Example of a step through end frameBRITISH STANDARDBS 1139-6:20148 The British Standards Institution 20143.3.5 portal end frameend frame with an aperture which enables passage through the ends of thetowerNOTE See Figure 9 for an examp
38、le.Figure 9 Example of a portal end frame3.3.6 bridge beamcomponent which is used to connect two prefabricated tower scaffolds andmight support the platformNOTE See Figure 10 for an example.BRITISH STANDARD BS 1139-6:2014 The British Standards Institution 2014 9Figure 10 Examples of bridge beams3.3.
39、7 bridge deckcomponent which connects and creates a bridge between two prefabricatedtower scaffolds3.4 working platform levelplatform unit or combination of platform units and/or cantilever platforms atthe level at which the work task is undertakenNOTE There might be more than one working platform.3
40、.5 access platform levelplace to stand when installing or removing components of the tower whenassembling, altering or dismantling the tower, or as a place to stand whenascending or descending the tower3.6 platform unitprefabricated unit which forms the platform or part of the platform of theprefabr
41、icated tower scaffold3.7 cantilever platformworking platform which projects outwards from the side or end of, and issupported by, the prefabricated tower scaffoldNOTE See Figure 11 for an example.BRITISH STANDARDBS 1139-6:201410 The British Standards Institution 2014Figure 11 Example of a prefabrica
42、ted tower scaffold cantilever platformKeyA Working level platformB Cantilever platform3.8 bayvertical section between uprights of a prefabricated tower scaffold throughthe entire length or width of the tower when viewed in elevationNOTE See Figure 12 for an example.BRITISH STANDARD BS 1139-6:2014 Th
43、e British Standards Institution 2014 11Figure 12 Example showing a prefabricated tower scaffold of 2 bay lengths in Elevation Aand 3 bays width in Elevation Ba) Elevation Ab) Elevation BBRITISH STANDARDBS 1139-6:201412 The British Standards Institution 20144 General Requirements4.1 GeneralThe requir
44、ements from BS EN 1004 shall apply with the exceptions given in thisBritish Standard.4.2 Load classAll prefabricated tower scaffolds shall be capable of supporting a uniformlydistributed load (UDL) relevant to the nature of the work being undertaken(see 7.2.3).4.3 Base platesBase plates used in conj
45、unction with a mobile tower shall conform to therequirements of BS EN 74.4.4 ConnectorsConnectors used to attach loose tubes used as structural members inprefabricated tower scaffolds shall conform to the relevant requirements ofBS EN 74.4.5 BallastIf ballast is necessary, it shall be secured in pos
46、ition against displacement andunauthorized removal. The ballast shall be made of rigid materials such as steelor concrete. Ballasts shall not utilize liquid or granular materials.5 Materials5.1 The materials of prefabricated tower scaffolds shall conform to the materialrequirements of BS EN 1004.5.2
47、 Loose tubes used as structural members in prefabricated tower scaffolds shallconform to the relevant material requirements of BS EN 12811-2.6 Dimensions6.1 High clearance frames6.1.1 When not intended for use on the highway for the passage of the generalpublic, high clearance frames shall have a mi
48、nimum clear height of 1.85 m andshall have a minimum clear width of 0.5 m.6.1.2 When intended for use on the highway for the passage of the generalpublic, high clearance frames shall have a minimum clear height of 2.44 m and aminimum clear width of 1.2 m.NOTE 1 See Figure 13.NOTE 2 Attention is draw
49、n to the PASMA document “Guidance notes andapplication for a licence to assemble and use a mobile tower on the highway” 2which gives guidance on the use of high clearance frames.BRITISH STANDARD BS 1139-6:2014 The British Standards Institution 2014 13Figure 13 Minimum clear height and width of a high clearance frame on the highway for the passageof the general public6.2 Walk through end frames6.2.1 When not intended for use on the highway for the passage of the generalpub
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