Cavity former

摘要

A cavity former 10 for use in forming a cavity in a concrete slab is disclosed. The cavity former comprises a support member which supports the weight of a person standing on the cavity former or of wet concrete bearing down on the array until the concrete has cured sufficiently to support itself. The array is reconfigurable between a compact state for stacking with other similarly configured arrays to facilitate transport and an expanded state to define a volume about which the wet concrete is poured. The cavity former 10 has a cover 34 which is engageable with the array to distribute the weight onto the array elements and prevent wet concrete flowing into the volume defined by the elements in the expanded state.