| 摘要 |
A method for manufacturing hollow-core concrete slabs, the method comprising: preparing a mould by suspending in the mould between first and second end-pieces a plurality of substantially parallel elongate void formers; filling the mould with a wet concrete mix up to the crown of the void formers; laying an inert pliable filamentary sheet on the surface of the concrete with filaments of the sheet extending transverse to the long axes of the elongate void formers, the filamentary sheet being restrained so as to resist movement of the concrete mix when the void formers are withdrawn from the mix; further filling the mould with the wet concrete mix over the filamentary sheet; and, subsequently forming hollow channels in the wet concrete mix by withdrawing the plurality of void formers from the concrete mix through the second end-piece. |
