To provide an underground water storage tank which improves a rainwater supply pipe for supplying rainwater to the underground water storage tank.
In this cleaning method for the underground water storage tank, after a self-propelled head 20 is guided to a first upper passage 4 and a passage 21, it is self-propelled in the passage 21 by the injection of high-pressure water, so as to cross a recessed groove section 5. After that, a force as great as/greater than a self-propelling force of the self-propelled head 20 acts on a hose 7 in a direction opposite to the self-propelling direction of the self-propelled head 20, and the self-propelled head 20 crosses the recessed groove section 5 by being moved in the direction opposite to the self-propelling direction of the self-propelled head 20, while continuing the injection of the high-pressure water from the self-propelled head 20. Sediment in a stacked body is collected in the recessed groove section 5 by the injection of the high-pressure water from the self-propelled head 20, and removed from inside the stacked body via a second upper passage 6, so that the inside of the stacked body can be cleaned.
COPYRIGHT: (C)2009,JPO&INPIT
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Ichiro Irie
Juichi Nosue