| 摘要 |
PROBLEM TO BE SOLVED: To contrive the correction of the tail clearance of both longitudinal ends by making the bolt attaching hole of a newly set segment for the existing segment of a corner part a slot centering a segment center by a plurality of pieces having the four corner parts. SOLUTION: An circular arc-like slot 25 centering the center O of a segment is provided on the corner part of an existing segment 20, and a slot 25A is also provided on the corner part of a newly set segment 20A. In the case where a shield excavator is rolled and the tail clearance of the corner part is improper, shifting is performed due to the slot to tighten a bolt. As the result, in the case where the segment 20A is assembled, a tail clearance is easily corrected, and the excavation efficiency of the width enlargement excavator can be improved. Thereby when the clearance becomes large by rolling, a lining member is matched on the state after rolling to be assembled so as to make the clearance small, and sealing effect can be improved.
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