| 摘要 |
PROBLEM TO BE SOLVED: To efficiently perform raising work in the existing manhole. SOLUTION: In this repair method for the circumference of the lid frame in the manhole M where the lid frame 2 is provided on the upper end of a cylindrical neck seat 1 raised from the underground conduit and a lid 3 is fitted to the lid frame 2, a receiving member 7 striding over the top face of the neck seat 1 is fixed at both ends thereof to the ground G, a raising member 8 having horizontal locking surfaces 8a, 8b confronting the upper end and lower end is provided on the receiving member 7 to elevate, and the lower end locking surface 8b is locked on a collar part 2a in the inner periphery of the lid frame 2. A jack 5 is placed on the receiving member 7, a plunger 5a of the jack 5 is applied to the upper end locking surface 8a from below, and the raising member 8 is elevated by the operation of the jack 5. When the raising member 8 is elevated, the lid frame 2 is raised to a designated height by the above locking, the height is kept to the neck seat 1 by a pedestal receiving bolt 9 vertically screwed in the lid frame 2 to fix the lid frame 2 to the neck seat 1, and the periphery of the lid frame 2 and the lower part thereof are filled with repairing material. COPYRIGHT: (C)2004,JPO&NCIPI
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