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水口工程主围堰由上下游两座心墙堆石围堰组成,上部采用土工膜防渗心墙,下部采用塑性混凝土防渗心墙。塑性混凝土防渗墙是厚度为80cm的地下连续墙,两端分别与明渠导墙和岸坡混凝土刺墙连接,墙底嵌入新鲜基岩30～50cm,混凝土标号为R_(28)~(20)。心墙施工采用泥浆固壁冲击钻配以抓斗造孔成槽,水下导管法浇筑。墙体总截水面积17795m~2,月最大成墙强度7416.5m~2/月,平均成墙工效5.11m~2/台·日,平均造孔进尺6.39m/台·日。在国内居领先地位。
The main cofferdam of the outlet project consists of two core rockfill cofferdams on the upper and lower reaches, the upper part adopts the geomembrane impervious core wall and the lower part adopts the plastic concrete impervious core wall. The plastic concrete cutoff wall is an underground continuous wall with a thickness of 80cm. The two ends of the plastic continuous concrete wall are connected with the concrete wall of the open channel guide wall and the bank slope concrete wall respectively. The fresh concrete floor is embedded with 30-50cm of concrete, R_ (28) ~ (20) . The construction of the heart wall using mud solid wall impact drilling with grasping into a slot, underwater catheter pouring. The total wall water cutoff area is 17795m ~ 2, and the maximum monthly wall forming strength is 7416.5m ~ 2 / month, with an average wall work efficiency of 5.11m ~ 2 / t · day. The average drilling hole footage is 6.39m / t. In the domestic leading position.