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一、概述水力发电站露天式引水压力钢管两镇墩之间的管路,由于受内部水温,周温气温,日光辐射,支承基础等的温度变化的影响,引起钢管伸缩,由于受镇墩的约束,在钢管管壁中产生很大的温度应力。例如,钢管所在地区最高和最低温度差一般都在30°～40℃以上,而钢管温度每变化10℃时产生的温度应力约为250公斤/平方厘米,因此,钢管温度应力常常很大,于是造成钢管同时承受内水压力、管重、水重等的重力和沿管轴向温度载荷的三向受力条件。为了改善上
First, an overview of hydropower station open-air pilot pressure pipe between the two town piers, due to internal water temperature, ambient temperature, solar radiation, supporting the basis of the temperature changes, resulting in steel telescopic, due to the town pier Constraints, in the steel pipe wall produces a great temperature stress. For example, the temperature difference between the highest and the lowest temperature in the region where the steel pipe is located is generally above 30 ° to 40 ° C, and the temperature stress produced by every 10 ° C change in the pipe temperature is about 250 kg / cm². Therefore, Resulting in steel pipe at the same time withstand the internal water pressure, pipe weight, water and other gravity and axial load along the axial direction of the three-dimensional stress conditions. To improve on