| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent buckling of a jacking rod by stretching a beam member for supporting a ring-like bending regulating member for limiting bending of an inserted jacking rod over between the opposite side wall surfaces substantially parallel to the advancing direction of the jacking rod in a starting shaft, and adjusting the support position in the stretching direction. SOLUTION: A rectilinear beam member 21 can be adjusted in its axial length by a handle 23 provided on one side in the axial direction, and a ring-like bending regulating member 20 for limiting bending of an inserted jacking rod 28 is supported by a support member 22. The support member 22 can be moved in the axial direction of the beam member 21 and fixed at an arbitrary position. Holding plates 24, 25 are respectively provided on both ends in the axial direction of the beam member 21, and allowed to contact the surface of a sheet pile for retaining the side of a starting shaft. The bending regulating member can be split into two, upper and lower parts, the upper side and the lower side are connected to each other by a connecting part 26, and when the other end connecting part 27 is opened, the jacking rod 28 is enveloped.</p> |
