硬梁包水电站水轮机金属蜗壳与压力钢管连接凑合节位置的优化选择

Optimal Selection of Make-up Joint Position between Metal Spiral Case and Penstock of Hydraulic Turbine in Yingliangbao Hydropower Station

硬梁包水电站水轮机蜗壳与压力钢管的连接处设计有凑合节,但压力钢管与蜗壳的连接处是各工序的交汇点,通常会由于水轮机蜗壳的设备制造误差、安装误差、工程测量误差、土建施工浇筑偏差以及压力钢管安装误差而产生误差累计,为了保障施工质量,调整了施工工序,把该处的凑合节取消,待机组座环蜗壳安装完成后,依次安装上游侧压力钢管,凑合节位置设置在钢管运输通道处,再与上游侧的压力钢管相连接。设置凑合节不仅有效解决了以上问题产生的误差累计,还有效克服了凑合节安装产生的强大金属内应力,提高了水轮机安装质量,达到水轮发电站机组安全稳定运行的目的。

The make-up joint between the spiral case and the penstock of the turbine in the Yingliangbao Hydropower Station is designed and set,but the connection between the penstock and the spiral case is the intersection of various processes.Error accumulation that causes by manufacturing error,installation error,engineering measurement error,civil construction casting error and penstock installation error often exists.In order to guarantee the construction quality,the construction procedure was adjusted and the make-up joint of this place was canceled.After the installation of the spiral case of the unit seat ring is completed,the upstream side pressure steel pipe will be installed in turn,and the position of the make-up joint will be set at the transportation passage of the steel pipe,then connected with the upstream side pressure steel pipe.In order to improve the installation quality of the hydraulic turbine,the installation of the make-up joint not only effectively solves the error accumulation caused by the above problems,but also effectively overcomes the strong metal internal stress caused by the installation of the make-up joint.In this way,the installation quality of the turbine is promoted,and the safe and stable operation of hydroelectric generating units is guaranteed.