| 摘要 |
<p>Sliding box element for positioning a film of insulating or draining material in a trench. The said box element comprises a front part for receiving a roll of film and a rear part for distributing the film in the trench. Between the front part (2) and the rear part (13), the box element comprises a splicing chamber (4) provided, at each end, with a pair of rollers (5-6, 7-8) mounted in the said chamber by means making it possible to vary the lateral separation of the rollers from a same pair between an active position in which the two rollers clamp the film (3) and a separated position in which the film runs freely between the rollers. <IMAGE></p> |
