Scaffolding safety rules 5
To be continued:
DISMANTLING OF SHORING EQUIPMENT
Premature releasing or stripping of shoring can be a cause of failure. A qualified engineer must decide when and how stripping is to proceed.
Variables which enter into this phase include load transfer, weather conditions, variations in different parts of the structure and the setting qualities of the concrete. After approval of a qualified engineer is obtained,
follow approved dismantling procedure. Screw jacks should be released only far enough to remove forming member. The dismantling of the equipment can then be performed in the reverse method used in erection and moved to the next location for reuse. It is often more desirable to merely release the adjusting screws to such a point that the forming members can be pulled away from the underside of the concrete and allowed to rest in certain modules on top of the frame shoring equipment and the entire unit moved to the next location. Formwork and shoring of varying sizes are frequently moved from one pour to other pours without dismantling or removing formwork. Lower shoring components in a safe manner. Do not drop or throw components as this could result in injury to personnel or damage to equipment.
THE RESHORING OPERATION
Reshoring is one of the most critical operations in formwork; consequently, reshoring procedure must be designed by a qualified person and approved by the architect/engineer of record. Extreme care must be taken to release the adjustment screws to a point where the slab takes its actual permanent deflection. The adjustment screws should then be tightened until contact is again made with the underside of the slab. In this manner, the frame reshoring below will not be carrying the load of the slab that it had previously shored. Reshoring is usually done to facilitate maximum reuse of framework and may utilize the strength of the completed construction below when such construction is fully cured and capable of supporting the loads to be imposed by the additional construction above. While reshoring is being placed, no construction loads should be permitted on the new construction. Extra care should be taken during a reshoring operation where an upper slab being poured is heavier than the slab being reshored.