| 摘要 |
PROBLEM TO BE SOLVED: To provide a quick construction method of a shaft for shortening a construction period, and reducing cost. SOLUTION: A key groove forming means 1 has a key groove forming body 3 (a hardening material 4 is filled inside) formed in response to a key groove shape of a bottom slab joining position and arranged so that an opening surface forming an opening part of a key groove abuts on the bottom slab side natural ground, a steel frame 3A having a recessed place for separably containing this key groove forming body 3 and assembled in a reinforcement gabion built up in a vertical groove, and a pushing-out device 5 arranged in this steel frame 3A and pushing out the key groove forming body 3 to the bottom slab side by swelling by supplying liquid or gas inside. The pushing-out device 5 is made of, for example, rubber, and pushes out the key groove forming body 3 to the bottom slab side via an insertion hole 3B formed in the steel frame 3A when swelling. The lower end of an injection pipe 6 communicates with the pushing-out device 5, and the injection pipe 6 communicates with a liquid or gas supply means having its upper end arranged in an aboveground part via the inside of the reinforcement gabion. COPYRIGHT: (C)2006,JPO&NCIPI
|
