水利学报Issue(2)：213-219,7.DOI:10.13243/j.cnki.slxb.2014.02.011
厂坝分缝处钢管预留环缝焊接时机对垫层蜗壳的影响
Influence of welding time to circumferential seam reserved for connecting penstock in dam and powerhouse parting on spiral case with cushion layer
摘要
Abstract
For a hydropower station at the dam toe, two factors have an influence on the spiral case with cushion layer and generator unit pedestal. They are the welding time to circumferential seam reserved for connecting penstock in dam and powerhouse parting and the optional anti-thrust ring at the downstream side of the joint. Based on a dam-powerhouse three-dimensional finite element model, the above-mentioned factors were investigated through numerical simulation. Firstly, if the penstock surrounded by cushion layer is adopted to cross the joint between dam and powerhouse, the diversion penstock acts a considerable thrust force on the spiral case in downstream direction due to the deformation of dam body. Therefore, ap-plying axial restraint on spiral case inlet is inadequate to reflect the real situation. Secondly, under differ-ent welding time,the anti-thrust ring all benefits the structural performance of spiral case and the shear-re-sisting of stay ring. If the girth welding is performed at a low water level of upstream reservoir, the above function is more obvious and the anti-thrust ring is recommended if allowed. Thirdly, in order to ensure safe and stable operation of the hydroelectric generator units, the non-uniform deformation of stay ring and generator pedestal should be considered as the mainly contributing factors, and the girth welding is recom-mended to be performed when the upstream reservoir water level is low.关键词
水工结构/厂坝分缝/焊接时机/止推环/垫层蜗壳Key words
hydraulic structure/joint between dam and powerhouse/welding time/anti-thrust ring/spiral case with cushion layer分类
建筑与水利引用本文复制引用
胡蕾,石长征,伍鹤皋,傅丹..厂坝分缝处钢管预留环缝焊接时机对垫层蜗壳的影响[J].水利学报,2014,(2):213-219,7.基金项目
国家自然科学基金资助项目（51179141）；中国博士后科学基金资助项目 （）
