| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of self-supporting an arched concrete reinforcement for a tunnel, which not only achieves positive self-supporting of the arched reinforcement but also improves the water cutoff performance of a tunnel internal wall surface, and contributes to improved workability and cost reduction. SOLUTION: According to the method, the reinforcements are assembled into an arched shape while being supported by a reinforcement assembling carriage 10. Then a plurality of tie rods 5 each stretched between both edges of an upper arch portion 3a of the arched reinforcement 3, are arranged in parallel with each other in a direction in which the tunnel 1 extends, and at the same time the reinforcement assembling carriage 10 is advanced forward of the tunnel 1. Thereafter while the arched reinforcements 3 are supported by a slide centering 20, the tie rods 5 are detached, and rail bearing fittings 22 are detached from the slide centering 20, followed by detaching a rail 4 from the arched reinforcements 3. Further thereafter, concrete 8 is placed in a gap between an internal wall surface 1a of the tunnel 1 and a form surface 23 of the slide centering 20. COPYRIGHT: (C)2009,JPO&INPIT
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