| 摘要 |
PROBLEM TO BE SOLVED: To provide a vertical shaft for a waste underground burying disposal facility, and a construction method of the vertical shaft attaining the disposal of waste in a long-term stable state by positively preventing the degradation of a back-filling material for isolating waste. SOLUTION: The vertical shaft 20 for the waste underground burying disposal facility to which a drift for the disposal of waste is connected is extended from the ground surface toward the depth of the natural ground G. The vertical shaft 20 comprises a steel pipe 22 insert-installed in an excavated pit 5 formed by excavating the natural ground G, to partition a space 21 connected to the drift, and a back-filling filler 23 formed of a bentonite admixture 23b filled between the excavated surface 5a of the excavated pit 5 and the steel pipe 22 to fill a clearance between water permeable materials 23a to thereby degrade water permeability. COPYRIGHT: (C)2008,JPO&INPIT
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