| 摘要 |
PROBLEM TO BE SOLVED: To exclude the effect of a leak at the middle of a pipe and the expansion of the pipe, to measure an injection flow rate at high precision and to conduct an air permeation test in the depth of a small-diameter bored pit. SOLUTION: This fluid permeation test device is provided with a container 5 arranged in the space S of a shutoff zone 3 in a bored pit 2 shut off by at least a pair of packers 4a and 4b, a liquid communicating pipe 15 provided at the bottom section of the container 5 and capable of communicating the shutoff zone 3 with the container 5 as required, a liquid feed/discharge pipe 13 connected to the bottom section of the container 5 and capable of communicating the container 5 with a liquid feed/discharge facility 7 on the outside of the bored pit 2 as required, a liquid quantity measuring means 19 measuring the fluctuation quantity of the liquid in the container 5, an air feed pipe 14 capable of communicating the shutoff zone 3 with an air feed facility 6 on the outside of the bored pit 1, an air feed/discharge pipe 12 connected to the upper section of the container 5 and capable of communicating the container 5 with the air feed/discharge facility 6 on the outside of the bored pit 2, and a gas quantity measuring means measuring the mass reduction of the gas in the shutoff zone 3. Water is injected into or discharged from the shutoff zone 3 by utilizing the container 5 and the gas pressure applied to it, thus a test zone for a permeability test is formed.
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