Abstract: The invention relates to a tong system for connecting a drill rod element (12) to an often stationary drill rod element (12) or for disconnecting a drill rod element from another drill rod element (12), wherein the tong system comprises at least two clamping blocks (20, 22), which face each other and are intended to fasten the tong system to the stationary drill rod element (12), and wherein at least one clamping block (20, 22) comprises movable means (30, 32) having a centering contour, which movable means (30, 32) are effective for adjusting the tong system in relation to the stationary drill rod element (12). The invention further relates to a clamping block (20, 22) as a component of such a tong system.

Abstract: The invention relates to a method for operating a tongs system (10) designed for assembling a drill string element (12) and an often stationary drill string element (12) or for separating a drill string element (12) from another drill string element (12), said tongs system having lower tongs and upper tongs that can be moved relative to the lower tongs by means of a drive unit (18). A displacement-measuring system (44) detects a position (46) of the upper tongs relative to the lower tongs. A control unit (48) compares an application torque determined as a function of the detected position (46) with a defined or definable desired application torque (54). The assembly of the two drill string elements (12) is terminated when the determined application torque reaches or exceeds the desired application torque (54). The invention also relates to a tongs system (I 0) operating according to said method.

Abstract: The invention relates to a tong system for connecting a drill rod element (12) to an often stationary drill rod element (12) or for disconnecting a drill rod element from another drill rod element (12), wherein the tong system comprises at least two clamping blocks (20, 22), which face each other and are intended to fasten the tong system to the stationary drill rod element (12), and wherein at least one clamping block (20, 22) comprises movable means (30, 32) having a centering contour, which movable means (30, 32) are effective for adjusting the tong system in relation to the stationary drill rod element (12). The invention further relates to a clamping block (20, 22) as a component of such a tong system.