Method, apparatus and hollow core forming member for casting concrete products by slipform casting

摘要

Disclosed is a method, apparatus (1) and core forming member (4) for casting concrete hollow core products. The disclosure notes that hollow core concrete slabs have webs of uniform thickness. End areas of the slab usually provide support and are subject to maximum shear stresses. The present apparatus (1) allows the core forming member (4) to be adjusted during the casting process to produce thicker end areas and relatively thinner webs distal to the end areas. The apparatus (1) includes a slipform mould (5, 6, 7) defining a limited cross-section for the product to be cast. A feed screw (3) feeds concrete mix through the slipform mould in at least one feeding stage. The apparatus (1) further comprises the core forming member (4) which includes a linear motion device to change the width of the core forming member (4) during the slipform casting process.