Measurement point with hydraulic sleeve

Our system of convergence measurement points anchored with a hydraulic sleeve has the advantage that they can be removed between measurements, which is practical, for example, in tunnels where no protruding bolts are allowed to break the tunnel profile. The hydraulic sleeve is installed at a sufficient depth in the rock borehole and the measuring bolt is fixed inside the sleeve by means of a locking mechanism if the tunnel profile is to be widened, the measurement points can be retained and replaced by new shorter measuring bolts.