近年来,我国由于钢铁工业和防腐技术的发展,钢管在大型输水管道工程中的应用逐渐广泛起来。在管段连接方面,钢管具有与传统使用的铸铁管不同的特点,影响着连通闸的工作状态,在连通闸设计中必须予以充分注意。输水管应用铸铁管材时,管间是承插连接,无论水温变化还是不均匀沉陷,都会由于管口的微小变形(可能造成管口的微渗)将温度应力及剪切应力抵消。而焊接连接的 In recent years, due to the development of the iron and steel industry and anti-corrosion technology, the application of steel pipes in large-scale water pipeline projects has gradually become widespread. In terms of pipe section connection, the steel pipe has different characteristics from the conventionally used cast iron pipe, which affects the working status of the communicating gate, and must pay full attention to the design of the communicating gate. When cast iron pipes are used for water pipes, the pipes are socket joints. No matter whether the water temperature changes or uneven sinks, the temperature stress and shear stress will be offset due to the tiny deformation of the nozzles (possibly causing micro-permeation of the pipes). Welded connection