Recovery device for subterraneous curtain wall grab in deep foundations - has grab cradle with cross saddle with captive tie rods, connected to traction unit outside foundations

摘要

The cradle (3) carries a cross saddle (6) both of which and the tie rods (4) are positively connected. Two captive tie rods (9), which are symmetrical to the centre axis (8) of the grab (1), pass through the saddle. The ends of the tie rods inside the grab each carry a stop plate (10). Each stop plate is connected to the main body (2) under the cross saddle. The connection has a separator unit (15) and a traction unit (12) connected to the captive tie rods, is located outside the deep foundations. ADVANTAGE - Permits secure opening of jammed grab buckets and recovery of grab. It can be adapted to various grab versions.