| 摘要 |
PROBLEM TO BE SOLVED: To construct an ultra-large depth large bore shaft by a simple facility and an execution method by excavating a second charge shaft down to a required depth after a first charge shaft, a first carrying-out shaft, a first in clined shaft, a first level drift and a first large bore shaft are constructed, and repeatedly performing these processes. SOLUTION: In an ultra-deep large bore shaft 1, after a first shaft T1 constituted of a peripheral wall 2, a first carrying-out shaft 3, a first charge shaft 4, a first inclined shaft 5 and a first level drift 6 are constructed, and these processes are repeatedly performed as the excavation bottom face of the following first shaft T1 and the excavation end of the first level drift 6 are made a base, and construction is performed down to the n-th shaft Tn of prescribed depth. The ultra-deep bore shaft can be safely, surely and inexpensively constructed by such a simple facility and an execution method. In addition, after the ultra-large depth large bore shaft is completed, the carrying-out shaft, the inclined shaft and the level drift can be used for the transportation of a person and materials, maintenance or the like, and can be effectively utilized without waste.
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