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BS1139 Scaffold Tube Specification
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This Section of BS 1139 describes a tube intended for use in falsework and working scaffolds.
Other very similar tubes are available, and to ensure that scaffolding tubes are able to be identified without doubt on the building site, there is a requirement for marking.
Scaffolds or falsework using these tubes should be erected in accordance with sound national practice;
in some countries this could restrict the choice of tube. Prefabricated steel scaffold components may be fabricated with these tubes, or others.
The design of such scaffolds will relate to the steel sections actually used in them.
BS1139 Scaffold Tube Object and Field of Application
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Object and field of application This Section of BS 1139 specifies requirements for steel tube intended for use in falsework and in access and working scaffolds constructed with separate tubes and couplers.
It has an outside diameter of 48,3 mm, and a wall thickness of 4,0 mm.
It also specifies tests on protective coatings and gives values for the design of structure.
2 References The titles of the publications referred to in this standard are listed on the inside back cover.
BS1139 Scaffold Tube Chemical COmposition and Tensile Strength
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3 Terminology The tube is referred to as “type 4” tube and represents a wall thickness of 4,0 mm.
4 Steel 4.1 Chemical composition Tubes shall be manufactured from steel whose chemical composition shall be in accordance with Table 1.
Table 1 — Determination of chemical composition of steel by ladle analysis For steel treated with aluminium, the nitrogen content may be increased to a maximum of 0,015 %. For steel which is to be protected by hot dip galvanizing (see 6.1) the silicon content shall not exceed 0,05 %. The use of rimming steel is not permitted.
Lo = original gauge length of the tensile test piece.
So = original cross-sectional area of the gauge length.
5 Manufacture
5.1 General
5.1.1 The tube shall be produced by a seamless or welded process. If the method of manufacture of the tube is not specified in the order, the choice of the method shall be at the option of the tube manufacturer.
5.1.2 The tubes shall have a smooth external surface consistent with the method of manufacture. Surface imperfections are permissible provided that the tube dimensions remain within the tolerance limit specified in Table 3.
5.1.3 The tubes shall have a circular profile and any ovality shall not exceed the tolerance limits on outside diameter specified in Table 3.
