Kajima Kensetsu Kabushiki Kaisha

Munetaka Kubota

Hiroshi Fujita

Kazuo Hosoya

Yukishige Takahashi

Takashi Makita

Subjacent and lateral supporting soil for an underground tank is stabilized wherein a tank embedded therein is secured against flotation irrespective of the water table level of the surrounding soil. The lateral supporting soil is encased within a well and the subjacent soil is hardened to minimize seepage of water into the soil adjacent to the tank. Means are also provided to remove excess water from the confines of the well thereby minimizing flotation pressure on the tank.

Method and construction of underground tank well

The ground surrounding a liquified gas storing underground tank is excavated into a form of a columnar cavity or wall shaped cavity, and then a synthetic resin bag or envelope is placed therein, after which granular materials such as sand or gravel is filled therein, thus forming a water permeable body of a columnar shape or wall-like shape. Then, water is injected into the water permeable body from its bottom and then discharged from the top of the body, thereby warming the peripheral ground of the underground tank for preventing freezing thereof. An apparatus for preventing the freezing of a liquified gas storing underground tank is also disclosed, which includes water feeding and discharging devices provided for the aforesaid water permeable body.

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Hino, Japan

Munetaka Kubota