Patent ID: 6116568
Filing Date: 2000-09-12
Classification: B28B,E02D,E04G,Y10S

Abstract:
A pair of reinforced cardboard panels for forming a reinforced box shaped structure for creating a void area in a concrete formation, each panel comprising:a series of two adjacent wall panel sections, the two adjacent wall panel sections divided by a slit score with a transverse slit extending across the slit score; and a horizontal panel section adjacent each of the two adjacent wall panel sections, each of the horizontal panel sections and respective adjacent wall panel sections divided by a crease line;said two adjacent wall panel sections of each reinforced cardboard panel defining a double-thickness wall with a flat top edge when folded about the slit score and the transverse slit of each reinforced cardboard panel sized to receive the double-thickness wall of the other reinforced cardboard panel so that each of the flat top edges is parallel to and supports the horizontal panel sections of the other reinforced cardboard panel when the pair of reinforced cardboard panels are interlocked via the transverse slits so that the horizontal panel sections of each reinforced cardboard panel define surfaces that may support poured concrete due to the support provided by the parallel flat top edges.