Construction of underground tanks – If the construction of an underground reservoir being at a high level standing finding groundwater, further arrange the filter hole to reduce the groundwater level after excavation. Filter typically drilled hole on the outside wall of the tank and frozen deep equip pump for pumping water over the lip installed inside the well.
The bottom of an underground tank suit after excavation, careful cleaning the inner wall surface and reduce groundwater below the top of the subgrade under the bottom.
To freeze to the bottom scraped laid the foundation system of distributing the refrigerant pipes. Before supplying the refrigerant pipe covered with moistened sand layer to 50 cm thick, and the vertical supply pipe and exhaust pipe of the refrigerant was placed in the shroud, which protects the outside of the thermal insulation layer of polyurethane foam. Bottom of the tank it usually gives a concave shape.
After freezing the bottom and pumping water out of the tank, which appeared during the period of works by freezing a layer of sand, arrange heat and waterproofing bottom. On the sandy bottom at first stack insulating layer. Polyurethane foam thickness of 50 cm, and then laminated waterproofing coating of thin aluminum alloy sheets. When laying the waterproofing coating arrange compensator and sealed by coating the periphery into the wall. After freezing, the bottom of the tank and laying insulation for refrigeration is stopped and the system is filled with liquefied natural gas to reduce the temperature at the bottom to about the temperature of the liquefied gas to be stored in an underground tank.
Simultaneously with the completion of work on the bottom of the device begin to tank roof. On steel, I-beams mounted radially placed lap steel roofing sheets, and the contour of the roof drainage arrange and gutters to drain water from the surface of the lower bench beams welded or fastened bolted sheets of aluminum alloy and steel between the upper and lower sheets of roofing aluminum alloy stack insulating layer of polyurethane foam, glass wool or perlite.
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