| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily recover a guide rail for guiding an excavator for excavating directly under a cutting edge. Ž<P>SOLUTION: A perforated member 71 having a hole 71a is fixed to a caisson box body 1, and a pin 72 is suitable for a bracket 73 provided at a reinforcement member 17. The reinforcement member 17 is suspended, the pin 72 is inserted to the hole 71a of the perforated member 71, and the drop-out of the pin 72 from the hole 71a is prevented by a locking mechanism 19. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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