Abstract: An apparatus for forming voids in concrete including baseplates secured to a wood supporting deck or form for a concrete floor by a plurality of short wood screws. An adjustable sleeve assembly is attached to each baseplate and is adjustable to a height generally equal to the thickness of the floor with the upper end of the sleeve being accessible and observable when concrete is poured. After the baseplates have been secured in place, various subsequent work procedures may be carried out without the workers encountering obstructions that would exist if upwardly projecting cavity forming members where attached to the wood deck and the sleeve assemblies are mounted prior to pouring the concrete. After the concrete has been poured and set, the sleeve assemblies and the baseplates are removed by unscrewing the sleeve assemblies, removing an upper sleeve and pulling a lower sleeve and baseplate up from the wood deck.

Abstract: An apparatus for forming voids in concrete which includes baseplates secured to a wood supporting deck or form for a concrete floor by a plurality of removable screws and a removalbe sleeve attached to each baseplate and having a height generally equal to the thickness of the floor with the upper end of the sleeve being accessible and observable when concrete is poured. After the baseplates have been secured in place, various subsequent work procedures may be carried out without the workers encountering obstructions that would exist if upwardly projecting cavity forming members were attached to the wood deck. A sleeve is then attached to each baseplate immediately prior to pouring concrete. After the concrete has been poured and set, the sleeves are detached from the baseplates and removed. The wood deck can then be stripped from the bottom of the concrete floor and the baseplates removed for reuse.