| 摘要 |
An elongated hollow mould for the integral formation of a raised sill or hob on the surface of a cast-in-situ concrete building slab, said mould comprising two generally parallel, continuous side panels joined in fixed spatial relationship at their upper and lower edges by spacer elements which permit the entry of concrete from above and the passage of concrete therethrough to formwork below upon which said slab is to be formed, thereby making the concrete within said filled mould contiguous with that of said concrete slab beneath; said mould being supported upon a plurality of discrete chairs, each said chair comprising two narrow, parallel, vertically oriented side panels joined at their lower ends by a transverse bottom part fixed to said formwork, said mould being supported in a said chair by a height-adjustable transverse bridge fixed to said chair side panels.
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