| 主权项 |
1. A device for enlarging caisson bases, comprising a engine shaft at upper extremity thereof and a socket of engine shaft, wherein the fixation of shaft in the socket is by means a cylindrical fixation pin, wherein a guide ring is arranged just below, that is bound to moveable column, below of moveable column being arranged the soil excavating mechanism comprising side arms and knives fixed to said arms which perform the enlarging of caisson base; said arms are pivotable through the pins that make a fixation between arms, the pivotable bars and the horizontal bars, at later, being arranged a rotary joint, a stationary column, and a collector vessel of excavated soil arranged at lower extremity of said device for enlarging, wherein said collector vessel has the same diameter as the guide ring. |
