闸墩大型裂缝成因分析及其治理.pdfVIP

第 24 卷 第 2 期 水 　力 　发 　电　学 　报 Vol . 24 　No . 2 2005 年 4 月 JOURNAL OF HYDROELECTRIC EN GINEERIN G Apr . , 2005 闸墩大型裂缝成因分析及其治理 邢林生 ,聂广明 ( 国家电力公司大坝安全监察中心 ,浙江杭州 　310014) 摘 　要 : 水电站闸墩上的大型裂缝 ,不仅影响到闸墩的耐久性 ,并危及到闸墩的强度 、稳定和水电站大坝的安全运行 。 闸墩配筋量明显不足 、闸墩温度应力超限和静冰压力过大 ,是引起闸墩严重开裂的一些主要原因。在对闸墩裂缝进行灌 浆封闭、预应力锚固或外贴式加固时 ,所采用的方法 、材料和工艺 ,直接关系到治理的效果 。位于严寒地区的水电站泄水 建筑物 ,必须设法防止闸门前库水结冰 , 以避免静冰压力对闸墩产生严重损害 。 关键词 : 水工结构 ; 闸墩裂缝 ;综述 ;治理 中图分类号 : TV31 文献标识码 : A Cause analysis and treatment of large cracks of piers XIN G Linsheng ,NIE Guangming (L arge Dam S af ety S upervision Center of S PCC , Hangz hou 　310014) Abstract : The large cracks in the piers of hydropower dams not only influenced the durability of the piers , but also endangered the strength and stability of the piers , as well as safe operation of hydropower dams , especially during discharging. The main causes that resulted in the piers seriously cracking were inadequate arrangement of pier reinforcement , over2temperature2stress of the piers and higher values of static ice pressures. The adopted materials and techniques to strengthen the piers with grouting for sealing , prestressed anchorage and so on were directly affected with treatment result . For the discharge structures of hydropower dam proj ects located in the severe cold regions , they would do their best to prevent from reservoir water frozen in front of the gates , so as to avoid the severe damages of piers resulting from static ice pressures. Key words : hydraulic structure ; pier cracks ; overview ; treatment 1 　概述 水电站泄水建筑物闸墩上产生裂缝 ,是一个比较普遍的现象 ,在对 100 余座水电站大坝定