小浪底水利枢纽孔板泄洪洞改建施工简述

Reconstruction of plate flood discharging tunnels in Xiaolangdi Hydro Project

介绍小浪底水利枢纽工程在大坝施工期间的 3条导流洞在完成导流任务后 ,通过以龙抬头的形式抬高进水口高程 ,回填封堵导流洞在进水塔基础范围内的部分 ,在龙抬头和中闸室之间设置孔板环以及缩小中闸室过流断面等施工方法 ,有效地解决了导流洞重复利用所遇到的高水头、高流速问题 .

Some engineering measures are introduced for reconstruction of flood discharging tunnels from three diversion tunnels after accomplishment of water diversion during the construction period of the Xiaolangdi Hydro Project. The measures include the construction of a head-rise structure to raise the elevation of the inlets, backfilling and blocking of part of the diversion tunnels in the range of the foundation of intake towers, arrangement of orifice-plate rings between the head-rise structure and middle lock chamber, and reduction of the overflow section of the middle lock chamber, effectively solving the problems of high water head and high flow velocity in reutilization of the diversion tunnels.