Bs 1139-1.2-1990

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

British Standard

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BRITISH STANDARD

Metal scaffolding —

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

Part 1: Tubes — Section 1.2 Specification for aluminium tube

BS 1139-1.2: 1990

BS 1139-1.2:1990

Committees responsible for this British Standard

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

The preparation of this British Standard was entrusted by the Civil Engineering and Building Structures Standards Policy Committee (CSB/-) to Technical Committee CSB/57, upon which the following bodies were represented:

This British Standard, having been prepared under the direction of the Civil Engineering and Building Structures Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 October 1990

Association of Consulting Engineers Association of Consulting Scientists British Constructional Steelwork Association Ltd. British Steel Industry Building Employers’ Confederation Concrete Society Construction Health and Safety Group Construction Industry Training Board Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users’ Association English Net Manufacturers’ Association Federation of Civil Engineering Contractors Health and Safety Executive Institute of Building Control Institution of Civil Engineers Institution of Structural Engineers National Association of Formwork Contractors National Association of Scaffolding Contractors National Federation of Master Steeplejacks and Lightning Conductor Engineers Prefabricated Aluminium Scaffolding Manufacturers’ Association Suspended Access Equipment Manufacturers’ Association

© BSI 02-1999 First published as BS 1139 November 1943 Second edition November 1951 Third edition June 1964 Fourth edition as BS 1139-1 April 1982 Fifth edition as BS 1139-1.2 October 1990 The following BSI references relate to the work on this standard: Committee reference CSB/57 Draft for comment 87/15200 DC ISBN 0 580 18471 4

Amendments issued since publication Amd. No.

Date of issue

Comments

BS 1139-1.2:1990

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Method of manufacture 1 3 Materials 1 4 Dimensions and tolerances 1 5 Workmanship 1 6 Finish 1 7 Identification 1 Appendix A Drift expanding test for extruded aluminium scaffold tubes 2 Figure 1 — Arrangement of drift expanding test 2 Table 1 — Dimensions and tolerances for aluminium tubes 1 Publications referred to Inside back cover

© BSI 02-1999

i

BS 1139-1.2:1990

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

Foreword This Section of BS 1139 has been prepared under the direction of the Civil Engineering and Building Structures Standards Policy Committee. Together with Section 1.1, it supersedes BS 1139-1:1982, which is withdrawn. This Section of BS 1139 is one of a series specifying requirements for the design, construction and testing of equipment for use in scaffolding and other temporary structures. It specifies requirements for aluminium tubing of the type traditionally used in tube and fitting scaffolding. The need for this new edition arose because of the advent of European proposals covering steel scaffold tube, whereas any such action for aluminium tubes is further away. Steel tubing is now covered in BS 1139-1.1. This Section retains the style and technical content of the 1982 edition, and is substantially the same as the 1964 version. The separate Parts and Sections are as follows. — Part 1: Tubes; — Section 1.1: Specification for steel tubes; — Section 1.2: Specification for aluminium tube; — Part 2: Couplers; — Section 2.1: Specification for steel couplers, loose spigots and base plates for use in working scaffolds and falsework made of steel tubes (Identical with EN 74); — Section 2.21): Specification for aluminium couplers, fittings and accessories for use in tubular scaffolding; — Part 3: Specification for prefabricated access and working towers; — Part 4: Specification for prefabricated steel splitheads and trestles; — Part 52): Specification for materials, dimensions, design loads and safety requirements for service and working scaffolds made of prefabricated elements. (Identical with HD 1000) 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.

Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, 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

preparation: it will cover fittings not included in Section 2.1. Additional couplers have not yet been harmonized. 2)

ii

In preparation.

© BSI 02-1999

BS 1139-1.2:1990

1 Scope

4 Dimensions and tolerances

This Section of BS 1139 specifies requirements for the material, dimensions and method of manufacture of extruded aluminium tubes for use in scaffolding. It specifies one grade of material and one range of dimensions. Appendix A describes a drift expanding test for extruded aluminium scaffold tubes.

The dimensions and tolerances for aluminium tubes shall be as given in Table 1. Table 1 — Dimensions and tolerances for aluminium tubes

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

2 Method of manufacture Aluminium scaffold tubes shall be produced by extrusion, e.g. by means of a process using a mandrel, a bridge die or a porthole. When tested in accordance with Appendix A, a tube in its finished state shall show no sign of an unsound weld. NOTE A tube with faulty welding will tend to exhibit a straight line, rather than jagged, fracture at the position of the weld. This test procedure should be considered as being a part of a quality control programme and the frequency of testing should be such as to ensure adequate quality control.

3 Materials 3.1 General The tube shall be manufactured from aluminium complying with the requirements of 3.2 and 3.3. 3.2 Chemical composition Tubes shall be extruded aluminium tubes complying with the requirements for alloy 6082-TF (formerly HE30-TF) as specified in BS 1474. NOTE As these tubes are heat-treated, heat should not be applied to them by welding, flame cutting, etc., unless this is carried out under the controlled conditions recommended in CP 118.

3.3 Mechanical properties The mechanical properties of the tubes shall be as follows:

3)

tensile strength (Rm)

295 N/mm2 min.

yield strength (Re) (0.2 % proof stress)

255 N/mm2 min.

elongation (A) on a gauge length, Lo, of 50 mm

7 % min.

Dimensions and mass

Tolerance

Outside diameter 48.30 mm

± 0.5 mm

Thickness 4.47 mm

± 0.56 mm

Nominal mass per unit length 1.667 kg/m (48.30 mm × 4.47 mm)

Single tube max. reduction 7.5 % Quantities of 150 m and over ± 5 %

Length if specified exact

± 6.0 mm

NOTE The following nominal values for the properties of aluminium scaffolding tubes of the dimensions in Table 1 are given for information purposes only. Details of maximum permissible stresses are given in BS 5973. Symbol

Value 6.15 cm2

Cross-sectional area

A

Second moment of area

I

Elastic modulus

Z

6.18 cm3

Radius of gyration

r

1.56 cm

14.9 cm4

5 Workmanship A tube shall not deviate from a straight line by more than 1/600 of its length, measured at the centre of the length. Tubes shall be clean and free from detrimental defects. The ends shall be cut cleanly and square with the axis of the tube.

6 Finish Tubes shall be mill finished, i.e. without any surface treatment. NOTE For all normal purposes no painting or other surface treatment is required. Tubes likely to remain in contact with wet acid or alkaline materials, e.g. damp cement or lime renderings, need protection. Advice on suitable coatings can be obtained from the Aluminium Federation3).

7 Identification The method of identification used shall not impair the performance of the tube.

Aluminium Federation Ltd., Broadway House, Calthorpe Road, Five Ways, Birmingham, B15 1TN.

© BSI 02-1999

1

BS 1139-1.2:1990

Appendix A Drift expanding test for extruded aluminium scaffold tubes

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

A.1 Principle The end of a tube or test piece is expanded using a conical mandrel until it tears or splits. The test is carried out at ambient temperature unless otherwise specified. A.2 Apparatus A.2.1 Polished steel conical mandrel, of adequate hardness and having a conical included angle of 30°, 45° or 60°.

A.3 Test piece The test piece shall consist of a piece of tube having a length equal to at least twice the external diameter of the tube. Both ends of the test piece shall be plane and perpendicular to the axis of the tube. The test piece shall be cleaned to remove any loose chips or dirt from the inside surface. NOTE The end to be tested is normally rounded by filing. However, a test piece with edges that have not been rounded is acceptable provided that the test result is satisfactory.

A.4 Procedure Lubricate the mandrel so that it does not rotate in relation to the tube during the test. Force the conical mandrel under pressure into the open end of the test piece, so that the axis of the cone coincides with the axis of the test piece. Continue applying pressure until the tube tears or splits.

Figure 1 — Arrangement of drift expanding test

2

© BSI 02-1999

BS 1139-1.2:1990

Publications referred to

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

BS 1474, Specification for wrought aluminium and aluminium alloys for general engineering purposes: bars, extruded round tubes and sections. BS 5973, Code of practice for access and working scaffolds and special scaffold structures in steel. CP 118, The structural use of aluminium.

© BSI 02-1999

Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad, 06 March 2003, Uncontrolled Copy, (c) BSI

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