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一、前言LNG(液化天然气)地下贮罐中贮存的LNG 温度为-162℃,贮罐体采用钢筋混凝土。罐的内侧装隔热材料,阻止LNG 的冷热传导,钢筋混凝土罐体温度可以保持在-40—50℃的低温。地下结构物的侧壁受着巨大的土压及地下水压的作用,支持结构壳体的受力构件可用钢筋混凝土。这是因为混凝土在-40℃～-50℃的抗压强度是常温抗压强度的2倍以上,而且混凝土对钢筋的握裹强度也大大增加。钢筋或混凝土在这一温度中具有良好的性能,钢筋混凝土复合体的低温屈伏强度、胶结强度都比常温时大得多,制作LNG 地下贮罐结构构件是一种非常合适的材料。
I. Introduction The temperature of LNG stored in LNG (liquefied natural gas) underground storage tanks is -162°C, and the tank body is reinforced concrete. The inside of the tank is equipped with heat insulation material to prevent the cold and heat conduction of LNG, and the temperature of the reinforced concrete tank can be kept at a low temperature of -40-50°C. The sidewalls of the underground structures are subjected to significant earth pressure and groundwater pressure, and the force members supporting the structural shell can be made of reinforced concrete. This is because the compressive strength of concrete at -40°C to -50°C is more than twice the compressive strength at normal temperature, and the grip strength of concrete on reinforcing steel is also greatly increased. Reinforced concrete or concrete has good performance at this temperature, and the low-temperature buckling strength and cementing strength of the reinforced concrete composite are much larger than those at room temperature. Therefore, it is a very suitable material to make LNG underground tank structural members.