| 摘要 |
<p>In the process of concreting prefabricated wall slabs, the device is used for making grooves and cutouts for service ducts. The purpose is to make such grooves fully exposed over their whole length, as soon as formwork is dismantled, so that the ducts can be laid in position immediately. A shaped batten unit (10), which is open, is fitted on to the formwork. It is wider on its open side (16) than on its closed rear (13). It is trapezoid in cross-section, with laterally fitted fixing flanges (12) bent back outwards on its sloping side surfaces (11) and lying in a plane parallel to its rear side.</p> |
