| 摘要 |
<p>Freshly cast hollow-cored concrete slabs are subjected to an immediate cutting operation prior to the hardening of the concrete mix in such a manner that exposes the cores, and the ends of the cores are automatically filled to avoid jointing mix from subsequently intruding into the cores. The cutting is performed by driving two sheet-like cutting blades (3), which are mutually placed in a V-shaped posture, through the slab so that cutting tips (10) of the blades (3) meet near the bottom of the slab; then driving an end cutting knife (1), whose sides (16) facing the mix are substantially parallel to the cutting blades (3), through the slab between the cutting blades (3) towards the cutting tips (10) of the blades (3) so that a homogeneous sheet (17) of the concrete mix is formed on the sides (16) of the end cutting knife; and, when the end cutting knife (1) reaches its lower position, lifting out the cutting blades (3) and pushing the formed homogeneous sheet (17) of mix by means of the end cutting knife (1) to adhere to the cut surface (18) of the slab formed by the cutting blades.</p> |
