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清江隔河岩水利枢纽于1987年1月开工,1995年6月第一台机组发电。主要导流建筑物由导流隧洞、RCC过水围堰、上石混凝土面板过水围堰和厂房施工围堰组成。初期施工导流方式为:枯水期用围堰挡水,导流隧洞过流,围堰挡水流量标准为3000立方米/秒;汛期用导流隧洞和围堰过水联合泄洪,导流标准为20年重现期洪水。导流建筑物经过4年的运行,导流隧洞的实际泄流能力与设计标准很接近,最大流速达15米/秒,洞顶锚喷混凝土完好无损。RCC围堰和上下游土石围堰挡水期间防渗效果较好,围堰共过水21次,最大洪水流量10700立方米/秒,接近10年重现期洪水,上游及下游过水围堰的下游坡面最大流速分别达8.5米/秒及11.5米/秒,经汛后检查,围堰安全完好。厂房围堰最高档水位达90米,其基础防渗墙采用柔性材料,防渗效果很好。导流建筑物安全运行的实践表明,该工程导流设计标准和方法切合实际,节省了工程费用,缩短了工期,确保主体工程的施工。
Qinghe Geheyan Water Control Project was started in January 1987 and the first generating unit was started in June 1995. The main diversion structures are diversion tunnels, RCC water cofferdam, Shangshi concrete face water cofferdam and plant construction cofferdam. The initial construction diversion methods are as follows: the cofferdam is used to block water in the dry season, the diversion tunnel is overcurrent, and the cofferdam drainage flow standard is 3000m3 / s; flood diversion tunnel and cofferdam combined discharge of water are used in flood season, and the diversion standard is 20-year recurring flood. After four years of operation of the diversion structure, the actual drainage capacity of the diversion tunnel is very close to the design standard with a maximum flow rate of 15 m / s. The roof anchor sprayed concrete is intact. The seepage prevention effect of RCC cofferdam and upstream and downstream rock-soil cofferdam is better. The cofferdam has been through water 21 times with the maximum flood flow 10700m3 / s, close to 10-year recurring flooding, upstream and downstream cofferdam Of the downstream slope maximum flow rate of 8.5 m / s and 11.5 m / s, after the flood inspection, cofferdam safe and intact. The highest cofferdam cofferdam water level of 90 meters, the basic impervious wall with flexible materials, seepage control effect is very good. The practice of safe operation of diversion structures shows that the standard and method of diversion design of the project are practical, saving the project cost, shortening the construction period and ensuring the construction of the main project.