| 摘要 |
To temporarily secure pit and tunnel construction a prop device (1) is intended which consists of an inner pipe (2) and an out pipe (3) which can be moved while inserted in each other. The pulling apart motion is initiated when a liquid is filled into a filler opening (11) into the outer pipe (3) whose cavity (9), (2) is separated form the cavity (9) by a plate (10). This plate (10) features a weak point (18). An endangerment of the workers is therefore eliminated. After the extension of the inner pipe (2) from the outer pipe (3) the partial wedges (40,41,42) are pushed into the remaining narrow gap (45) so that the desired locking effect takes immediatley place. The water or liquid can exit again from the cavity (9), (2) via the filler opening (11). A very light prop device (1) that absorbs sufficient straining forces has been created. |
