Of for the safe erection and use of scaffolding

The safe load of a tie must not exceed one-quarter of the breaking load of tieand anchorage.A tie that is not capable of transmitting tension and compression must be usedin conjunction with a spreader or putlog extension. They must be placed closeto each other and be adequately held in position.A wire tie must be fastened to a structure by an approved anchorage, athrough bolt or tied to a strong back. The strength of the building structure atthe location of the tie must be checked for its adequacy to sustain the loadswhich will be transferred to it.When intending to fix cast-in and drilled-in anchorages, the manufacturer’srecommended safe working load may be used.Where the tie spacing of table 1 cannot be complied with, additional planbracing or dogleg bracing shall be provided between tie points.3.11 BRACINGAdequate bracing must be provided as follows:3.11.1 PLAN BRACINGWhere the horizontal tie spacings cannot be complied with, plan bracing shallbe provided. Even with this bracing provided, the maximum horizontaldistance between tie points shall not exceed 9.6 m. (Fig 12(a)).Tied standard9.6 m or 4 standards maxTied standardFig. 12 (a) Plan bracing where horizontal tie distance is excessive.Note that substantial ties are required.3.11.2 DOGLEG BRACINGWhere it is impracticable to fit ties at the vertical spacing specified, doglegbracing shall be provided. With such bracing the distance between tie pointsshall not exceed 8.4 m or 4 lifts. (Fig.12 (b)).Temporary ties may be required to ensure stability of the scaffold duringerection and dismantling.When plan or dogleg bracing is used, the ties are required to carry substantialloads. The ties shall be capable of carrying this load.SAFE ERECTION AND USE OF SCAFFOLDING 37