Oil tank with good drainage method for making the oil tank with good drainage and method for making installed oil tank into oil tank with good drainage

摘要

The present invention relates to an underground drainage type oil storage tank, a constructing method thereof, and a constructing method for repairing the existing underground oil storage tank into the drainage type oil storage tank. The underground drainage type oil storage tank comprises: a tank main body of which side walls, the bottom surface, and the top surface are made of steel plates, and which includes an inside collecting well formed on the bottom surface thereof, and an inside drainpipe for discharging a fluid in the inside collecting well to the outside; a concrete top surface unit which is formed over both a concrete outside wall unit, formed outwards from the side walls of the tank main body, and the top surface of the tank main body unit; a basic concrete unit which is placed in the lower part of the bottom surface of the tank main body unit; and a drainage unit including one or more collecting grooves which are formed on the top surface of the basic concrete unit, a reversed n-shaped collecting channel which is inserted into the collecting groove, of which the top end touches the bottom surface of the tank main body unit, and is made of steel, an outside collecting well which is positioned at the center of the top surface of the basic concrete unit, and an outside drainpipe which discharges a fluid in the outside collecting well to the outside and is made of steel. Therefore, the underground drainage type oil storage tank and a constructing method thereof can effectively prevent damage to the oil storage tank installed under the ground due to underground water, etc.