| 摘要 |
PROBLEM TO BE SOLVED: To provide a removal method of an existing shaft for removing the existing shaft abreast with draining work in the shaft without building up and dismantling a scaffolding. SOLUTION: In this removal method of the existing shaft 1, floating scaffoldings 4, 5 are floated on the water in the shaft 1, and the water level in the shaft is regulated according to the removal part of the existing shaft to remove the existing shaft from the floating scaffoldings 4, 5. COPYRIGHT: (C)2006,JPO&NCIPI
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