Singapore legislation
Regulation 31
Regulation 31
Ties for metal scaffolds
Subregulation 1
It shall be the duty of the responsible person to ensure that the requirements of paragraphs (2) to (7) are complied with.
Subregulation 2
Every alternate lift and every uppermost lift of an independent tied metal scaffold in a workplace shall be effectively tied to the building or structure by means of ties.
Subregulation 3
Ties shall be located no further than one bay from the ends of the independent tied metal scaffold and thereafter, at intermediate spacing of not more than 3 bays or 7.5 metres apart, whichever is the lesser.
Subregulation 4
Ties other than tie tubes and couplers shall not be used without the approval in writing of the Commissioner.
Subregulation 5
Every tie under this regulation shall conform with the following:
tie tubes shall be attached by right angle couplers to the outside ledger or standard or, in the case of an independent scaffold, to both the inside and outside standards as close as possible to the junction of the standards and ledgers; and
the ends of the tie tubes shall be attached to the building or structure by one of the following methods:
the tie tubes shall form part of a yoke constructed of tubes and couplers which passes around and bears hard against the sides of a column, pier, beam or similar structural members;
each tie tube shall pass through the wall and be secured with 2 pieces of tube of minimum length of 300 millimetres and shall be attached one on each side of, and bear hard against, the wall;
each tie tube shall be attached to a reveal tie not greater than 1.5 metres in length but reveal ties shall not be used where a horizontal diagonal plan bracing is used; or
each tie tube shall pass through ring bolts which shall be secured by casting in or being anchored in the wall.
Subregulation 6
Every tie tube shall be perpendicular to the longitudinal plane of the scaffold and, where this is not practicable, the deviation from the perpendicular shall not exceed 15°.
Subregulation 7
Every tie shall be capable of withstanding a force of 1,000 kgf applied in either direction along the length of the tie.