Zudal This code is only applicable to scaffold made from tube and scaffold fittings which when new complied with one of the following standards: Scaffoldjng certain circumstances it may not be possible to fit butt tubes at right angles to the transom to form lip ties. The choice of appropriate ties and their positioning should make this possible. Suspension wires may be inclined to reduce the span of the grid of tube. Various components are then used to attach the scaffold. This edition introduces technical changes but it does not reflect a full review or revision of the standard which will be undertaken in due course to make the standard compatible with the forthcoming European Standard for scaffolds, expected to be published in by the European Committee for Standardization CEN. BS However in some instances, such as hoist towers, tighter tolerances may be required and should be used in preference to those given in Table 4.
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Zulkigor When longitudinal bracing is omitted, the lateral movement of both the inside and outside lines of the standard at every lift should be prevented scaffoldung by both lines being adequately butted or by adequate plan bracing onto firm points inserted at every level. They are constructed in tubes and couplers for the purpose of providing working platforms adjacent to the surfaces of buildings.
In addition to the general duties to the public under the Health and Safety at Work etc. Specific guidance is given, but no towers should be built with a least base dimension less than 1.
If dismantling has reached the stage at which a critical member has to be removed, e. Ledger bracing may be omitted from this lift provided the lengths of the standards in the lift area are not in excess of 2. Structural calculations for scaffolds 39 Technical data and notes on calculation 75 Because scaffold tube has a long life, this edition of BS contains information on both qualities of ns.
Safe systems of construction and dismantling should be planned and adhered to on the site. Stationary towers outside are usually exposed and are therefore subject to wind forces. They should ensure that the scaffolds are maintained in the relevant condition throughout their use. For these circumstances, the wind forces should be calculated and the tower restrained by kentledge or guys to give a factor of safety against overturning of 1.
Driven tube anchors should not be used on a down slope towards the structure. They are frequently maintained in position by guys at either side. This operation should be carried out under competent supervision. The load from transverse wind forces may be taken account of by the incorporation of suitably stiff framing and a means for transferring the local wind loading to it.
Any pair of standards which are ledger braced should be made into a complete series of triangles. Section 2 makes recommendations on the care of the materials and on the degree of wear and tear which should not be exceeded if the materials are to be included in a structure which is intended to be in accordance with this code.
When several such levels are required, care should be taken to restrict scaffoldin lengths of the standards by supplementary lifts to give the necessary load-carrying capacity in the standards. See Figure 27 for typical examples. In no case should the overhang be less than 50 mm. The forces at these points should be determined by the principle of leverage on the assumption that scafflding applied weight from the scaffold acts between the inside and outside standards of the scaffold at a point of the width of the scaffold dcaffolding the outside.
For special scaffolds refer also to Warning notices should be fixed to draw attention to those parts of a scaffold which are incomplete and should not be used. They should be accompanied by adjacent butting transoms and sway transoms. Toeboards may be incorporated within the screen and the screens scaffoldinf be capable of preventing the materials being used passing through. Intermediate transoms are fixed between the beams so that the resulting framework can be boarded out.
Torque should not be applied to a coupler through an ill-fitting spanner. External birdcages should be braced to resist wind forces and anchored when necessary. The assembly should comply with any local authority requirements for temporary works on pavements.
The capacity of the anchorages should be established either by a proof load test or by test to failure on a representative sample chosen on an acceptable statistical basis.
Most of the content of the instructions is likely to be drawn from this code, especially as standard scaffold tube and couplers will frequently be used as an adjunct to the proprietary sections. All lifting gantries should be the subject of design and calculation. In certain circumstances lifts greater than 2. The requirements for tube specified in BS Frequently the forces are too large to be resisted by normal scaffold couplers or splicing and other methods such as pinned spigots or sleeves should be used.
Towers outside are usually exposed and are therefore subject to wind forces. Where joints are necessary they should be positioned at a distance not greater than of the scaffoldjng between adjacent standards.
The ledger bracing should preferably be fixed from ledger to ledger with right angle couplers when the lift is not to be boarded but may be fixed to the standards using swivel couplers. NOTE The height to least base ratios given in this clause relate to scaffolds constructed from steel scaffolding materials. Building Operations and Works of Engineering Construction. Due allowance has been made for this fact in this code.
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