| 摘要 |
PROBLEM TO BE SOLVED: To securely prevent the diffusion of stored gas leaking from a tank at a low cost. SOLUTION: Water injecting boring holes 16, 16, etc., are disposed at positions surrounding a tank 14 in bedrock R, drain water holes 17, 17, etc., are provided between the water injecting boring holes 16, 16, etc., and the tank 14 to be positioned around an outer surface of a gas-tight member 13, the water injecting boring hole 16 and the drain water hole 17 are both composed to be communicated with the bedrock R, and the water injecting boring hole 16 and the drain water hole 17 are connected to each other through a pump P.
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