Device for making relief cuts in drills in concrete and rock and method for joining together two slabs of concrete including such drills

摘要

In the device, about a rotary shaft (2) are located several pivot pins (20) which are parallel to this shaft (2) and can rotate in conjunction with it (2), and displacement-conversion members (8, 20, 22, 24, 25) are provided, with the aid of which axial displacement of a driving member (10) which can be displaced linearly may be converted into a common movement of pivoting of the pivot pins (20), independently of the rotational movement of the shaft (2), and the pivot pins (20) are connected, at their lower end zones, to material-removal tools. Application particularly to the connecting of concrete slabs for making airfield runways.