Tunnel shield support frame - has box-framed sole unit and walking mechanism with hydraulic ram

摘要

The support frame has a sole plate (1) supporting hydraulic jacks (6). It has a walking mechanism working along the channel (4) of the sole unit (1). A retreating frame (7) comprises two vertical parallel profiled legs (12) formed into cutters (14) along the bottom edge, and is linked to a hydraulic ram (8). The cutters (14) work along the channel base (5). USE/ADVANTAGE - The frame (7) is so constructed as to preserve the function of the sole skids and lifting mechanism.