Of for the safe erection and use of scaffolding

TABLE 1: TUBULAR SCAFFOLDS IN STEEL AND ALUMINIUMMember Light- Medium- Heavy-Duty Duty Duty Notes1. Working Platforms (i) Maximum height of scaffold must not exceed 33 m.Number per bay that may be used(ii) Height of each lift must not exceed 2.1 m, exceptat one time, whenfor the first lift which may be up to 3 m in height.(a) height does not exceed 33 m 2 1 1(b) height does not exceed 13.5 m 4 2 22. Scaffold Planks When the span of a medium-duty platform decked ...with timber planks exceeds 2.0 m, one intermediate(a) Timber planksputlog must be used.(solid or laminated) 2.4 m 2.0 m 1.2 m One intermediate putlog must be used on heavy-duty(b) Metal planksplatforms decked with timber planks.(steel or aluminium) 2.4 m 2.4 m 1.8 m3. Standards (i) All members, including bracing, guardrails and(a) Longitudinal spacing 2.4 m (max) 1.8 m midrails, consist of either steel tubes for steel(b) Transverse spacing 1.55 m (max) 1.27 m scaffolds, or aluminium tubes for aluminium scaffolds.Aluminium tubes and steel tubes must not be mixed4. Ledgers unless it is a requirement of a special design.(a) Horizontal spacing (between(ii) Putlogs are connected to ledgers at each pair ofstandards) 1.45 m standards.(b) Vertical spacing (i.e. Iift height) 2.1 m (max) (iii) Guardrails and midrails are fixed to the inside of1.8 m (min) standards.5. Putlogs (iv) All dimensions are from centre to centre of theMaximum span 1.45 m 1.27 m respective members.6. Ties (i) One tie must be provided at or as near as(a) Horizontal spacing 4.8 m (i.e. on alternative practicable to the top-most working platform.pair of standards)(ii) The vertical tie spacing may be increased to(b) Vertical spacing 4.2 m (i.e. on alternative 8.4 m provided one substantial tie is placed at thelifts)top-most working platform and that transverse doglegbracing is used on alternate pairs of standards.(iii) The horizontal tie spacing may be increased to9.6 m provided that substantial ties are placed at theend pairs of standards and that plan bracing isplaced at the level of the ties.7. Bracing At each end of standards and at not more than every(a) Tranverse diagonaltenth pair of standards along the scaffold. This is notrequired when dogleg bracing is used in lieu of ties.(b) Longitudinal diagonal One diagonal for every 3 bays or less in length, and 3lifts in height of scaffold, on outer face and at approximately40 o slope, arranged either in a zigzag pattern .from bottom to top or sloping continuously from ...bottom to top (see fig. 13).SAFE ERECTION AND USE OF SCAFFOLDING 45