| 摘要 |
<p>The box has a sidewall provided with an extraction system (17) to extract the box installed in concrete. A coupling device (13) couples the box to a holding structure (14). The system has an uncoupling system (18) to uncouple the box relative to support legs (4) of bottom (3). The uncoupling system has a pin (21) extending outwardly from the bottom and a tubular leg forming barrel closed at a free end (4-1) and opened at another end for being engaged on the pin and stopped against the bottom. The uncoupling system has a removing system to remove attachment of the box relative to the structure. An independent claim is also included for a method for installation of pipes in a concrete slab.</p> |
