Prop device for mining and tunnel construction

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. 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 immediately 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.