天津南郊电站地下机房是安装机电设备及控制系统的防水工程。主机房与巡视通道间设置一条沉降缝,相邻砼用止水带防水封闭。由于沉降缝结构独特,设计断面较小,给施工带来一定的困难。突出的是止水带不易固定和止水带下砼难以捣固密实两大难题,因而造成了沉降缝3m长范围内渗漏(图1)。 The underground room of the Tianjin Nanjiao Power Station is a waterproof project to install electromechanical equipment and control systems. A settling seam is set between the host room and the inspection channel, and the adjacent jaws are sealed with a waterproof band. Due to the unique structure of the settlement joints and the small design section, it brings certain difficulties to the construction. The prominent problem is that the water stop zone is difficult to fix and the water stop zone is difficult to tamping and consolidating under the water zone. As a result, the settling seam leaks within a range of 3m (Figure 1).