高水头水轮机配水环管(蜗壳)水压试验及保压浇筑混凝土

Hydraulic Pressure Test on Water Distribution Ring of High-head Hydraulic Turbine and the Pressure Keeping Concrete-pouring

高水头冲击式水轮机配水环管(蜗壳)采用分段压力试验,消除大厚度钢板焊接过程中产生的应力;大型中高水头抽水蓄能机组也采用水压试验来有效消除蜗壳焊接过程中的应力并检查焊接质量,同时检验蜗壳充水后的变形规律。两种类型机组的配水环管和蜗壳均采用保压浇筑混凝土施工的方法,取消蜗壳与混凝土之间的弹性垫层,使蜗壳与混凝土紧贴,减小机组运行中的振动,减小蜗壳内水压力对混凝土的作用力,增加安全裕度。

The water distribution ring of high-head percussive turbine adopt subparagraph pressure test to remove the stress caused by thick plates during the process of welding. Large-scale and high-head pumped storage units also adopt hydrostatic test to eliminate the stress and inspect the welding quality, further to test the deformation water distribution ring （volute）. Two types of water distribution units and volute adopt the pressure keeping concrete pouring methods and abolish the elastic cushion between the volute and the concrete volute to reduce the vibration of the operate units and reduce water pressure on the concrete and increase the safety margin.