沐若水电站压力钢管设计

Penstock design of Murum Hydropower Station in Malaysia

马来西亚沐若水电站引水发电系统的压力钢管设计水头高,抗外压稳定性要求高,设计难度大。阐述了钢管设计原则,即由内水压力确定管壁厚,用抗外压稳定进行复核,通过设置加劲环和增加管壁厚度来加固局部不满足规范要求的管段。用三维有限元方法计算了调压井岔管、月牙岔管和支段钢管在设计运行工况和水压试验工况下的应力和变形。计算结果表明,钢管应力、变形值均满足设计规范要求。

The design of diversion penstock of Murum Hydropower Station is confronted with the difficulties arising from high water head and strict requirements of anti - buckling. We present the design principle, namely the width of the penstocks is de- termined by internal pressure and rechecked through buckling analysis, and some less safety parts are further strengthened by stiffener rings and increase of wall width. The deformation and stress of bifurcated pipe and crescent bifurcated pipe under design operation case and water pressure test case are calculated by 3D FEM. The results show that the deformation and stress values of the penstock are complied with the requirements of the design specification.