Patent ID: 6637977
Filing Date: 2003-10-28
Classification: B65G,Y02E

Abstract:
A compressed gas storage tank utilizing a rock-bed cavity in which a bentonite slurry is fed into an underground cavity formed in a rock-bed, and a compressed gas forcibly fed to said underground cavity through a compressed gas pipe is stored in said rock-bed cavity in a state in which the compressed gas is loaded with a pressure load of the bentonite slurry from the underside of the compressed gas,wherein said compressed gas pipe is open downward from a top portion of said rock-bed cavity, and said bentonite slurry in said rock-bed cavity is of a dual layer structure consisting of an upper layer composed of a light bentonite slurry mixed with a filling-up material invading into and filling up a void and a crack formed in an inner wall surface of the rock-bed cavity and having a specific gravity of 1.05 to 1.20, and a lower layer composed of a heavy bentonite slurry mixed with a high specific gravity fine powder as a load condition material and having a specific gravity of 1.20 to 2.0.