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21/30412754 DC BS 1139-6. Metal scaffolding - Part 6. Prefabricated tower scaffolds outside the scope of BS EN 1004, but utilizing components from such systems. Specification, 2021
- Form 36_30412754.pdf
- BS 1139-6 DPC (1).pdf [Go to Page]
- 1 Scope
- 2 Normative references
- 3 Terms and definitions and symbols [Go to Page]
- 3.1 Terms and definitions [Go to Page]
- 3.1.1 prefabricated tower scaffold
- 3.1.2 standard configuration
- 3.1.3 non-standard configuration
- 3.1.4 prefabricated tower scaffold standard configurations [Go to Page]
- 3.1.4.1 cantilever tower scaffold
- 3.1.4.2 large deck tower scaffold
- 3.1.4.3 linked tower scaffold
- 3.1.4.4 stepped tower scaffold
- 3.1.4.5 high level tower scaffold
- 3.1.5 prefabricated tower scaffold components [Go to Page]
- 3.1.5.1 base plate
- 3.1.5.2 end frame [Go to Page]
- 3.1.5.2.1 walk through end frame
- 3.1.5.2.2 step through end frame
- 3.1.5.2.3 portal end frame
- 3.1.5.3 high clearance frame
- 3.1.5.4 bridge beam
- 3.1.5.5 bridge deck
- 3.1.5.6 platform unit
- 3.1.6 working platform level
- 3.1.8 cantilever platform
- 3.1.9 bay
- 3.1.10 cladding
- 3.1.11 netting
- 3.1.12 sheeting
- 3.1.13 tie
- 3.1.14 anchor
- 3.1.15 supplier
- 3.1.16 application
- 3.1.17 use
- 3.1.18 alteration
- 3.1.19 user
- 3.1.20 variation
- 3.2 Symbols
- 4 Classification [Go to Page]
- 4.1 Load classes
- 4.2 Access classes
- 4.3 Height classes
- 4.4 Configuration classes
- 4.5 Wind classes
- 5 Materials
- 6 General requirements [Go to Page]
- 6.1 General [Go to Page]
- 6.1.1 Standard configurations
- 6.2 Dimensions [Go to Page]
- 6.2.1 High clearance frames
- 6.2.2 Walk through end frames
- 6.2.3 Step through end frames
- 6.2.4 Portal end frames
- 6.3 Openings within platforms
- 6.4 Side protection
- 6.5 Castor wheels and base plates
- 6.6 Access to platforms
- 6.7 Means for stabilizing [Go to Page]
- 6.7.1 Stabilizers and outriggers
- 6.7.2 Ballast
- 6.7.3 Tying in
- 6.8 Connections
- 6.9 Working and access platform units
- 6.10 Assembly and dismantling
- 6.11 Requirements for prefabricated tower scaffolds less than 2 m working platform height
- 6.12 Requirements for prefabricated tower scaffolds used for access to another place
- 6.13 Vertical distances between platforms [Go to Page]
- 6.13.1 Requirements for platforms used for vertical ascent and descent and work
- 6.13.2 Requirements for platforms used only for work and not for vertical ascent or descent
- 7 Requirements for structural design [Go to Page]
- 7.1 General [Go to Page]
- 7.1.1 Cladding
- 7.1.2 Internal and external support
- 7.2 Characteristic actions on the complete structure including its parts [Go to Page]
- 7.2.1 Vertical loads [Go to Page]
- 7.2.1.1 Tower nominal self-weight as given by the manufacturer
- 7.2.1.2 Uniformly distributed load on the working platform(s)
- 7.2.1.3 Load resulting from an inclination of 1%
- 7.2.1.4 Minimum vertical service load on the structure, equally distributed on four legs
- 7.2.2 Horizontal loads [Go to Page]
- 7.2.2.1 Horizontal service loads
- 7.2.2.2 Horizontal loads to simulate wind
- 7.3 Characteristic actions on parts of the structure [Go to Page]
- 7.3.1 Loads on platform units
- 7.3.2 Load on side protection [Go to Page]
- 7.3.2.1 Downward load
- 7.3.2.2 Horizontal loads
- 7.3.3 Loads on stairways and stairladders
- 7.3.4 Load on inclined ladders
- 7.3.5 Load on vertical ladder
- 7.4 Deflections [Go to Page]
- 7.4.1 Elastic deflection of platform components
- 7.4.2 Elastic deflection of side protection
- 8 Structural design [Go to Page]
- 8.1 Basic design principle [Go to Page]
- 8.1.1 Introduction
- 8.1.2 Structural design of components [Go to Page]
- 8.1.2.1 Steel
- 8.1.2.2 Aluminium
- 8.1.2.3 Timber
- 8.1.2.4 Other materials
- 8.1.3 Limit states
- 8.2 Structural analysis
- 8.3 Verification [Go to Page]
- 8.3.1 General, partial safety factors and ultimate limit state
- 8.3.2 Side protection
- 8.3.3 Serviceability limit state
- 8.3.4 Verification report
- 8.3.5 Design certificate
- 8.4 Positional stability [Go to Page]
- 8.4.1 General
- 8.4.2 Load Case 1 [Go to Page]
- 8.4.2.1 Safety factor
- 8.4.2.2 Vertical loads
- 8.4.2.3 Horizontal loads
- 8.4.2.4 Additional loads
- 8.4.3 Load Case 2 [Go to Page]
- 8.4.3.1 Safety factor
- 8.4.3.2 Vertical loads
- 8.4.3.3 Horizontal loads
- 8.4.3.4 Additional loads
- 8.4.4 Special load case for cantilever tower scaffolds
- 9 Deflection
- 10 Information to be supplied with the prefabricated tower scaffold [Go to Page]
- 10.1 General
- 10.2 Identification of components in the structure [Go to Page]
- 10.2.1 Assembly, permissible alterations and dismantling
- 10.3 Inspection information
- 10.4 Stability
- 10.5 Application and moving [Go to Page]
- 10.5.1 The instruction manual or assembly use and dismantling plan shall give at least the following information regarding what should be checked before each application of the prefabricated tower scaffold as an addition to the checks made during the ...
- 10.5.2 The instruction manual or assembly, use and dismantling plan shall give guidelines for the safe application of the prefabricated tower scaffold.
- 10.5.3 The instruction manual or assembly, use or dismantling plan shall give information regarding the means of access to the prefabricated tower scaffold.
- 10.5.4 The instruction manual or assembly, use and dismantling plan shall give guidelines for the lifting of tools and materials to the working platform of the prefabricated tower scaffold within the limits of the permitted load and stability.
- 10.5.5 The instruction manual or assembly, use and dismantling plan shall detail the procedure for moving the prefabricated tower scaffold, including:
- 10.5.6 The instruction manual or assembly, use and dismantling plan shall state at least the following safety information:
- 10.6 Inspection, care and maintenance
- 11 Marking
- 12 Assessment [Go to Page]
- Annex A (informative) Contents of an assembly, use and dismantling plan
- A.1 General
- A.2 Assembly, Use and Dismantling Plan contents
- A.3 Engineering drawing
- A.4 Method statement
- A.5 Risk assessment
- A.6 Instruction manual(s)
- A.7 Rescue plan
- A.8 Handover/Inspection records [Go to Page]
