SMW工法加斜抛撑及挂网喷砼组合支护在深基坑中的应用

Application of SMW Construction Method Combined with Slanting Bracing and Net Hanging Shotcrete Support in Deep Foundation Pit

采用SMW工法+斜抛撑与坡面挂网喷砼组合辅以管井降水适合地下水位高,部分需要垂直支护与部分放坡的施工场地。该支护体系是在有垂直支护要求位置采用SMW工法,在其桩顶部施作冠梁,其内侧与型钢斜抛撑组合形成。在地势开阔区采用SMW工法止水+坡面挂网喷砼的组合方式,施工过程简单,速度快,能很快形成止水帷幕,造价较低且位移相对较小,适用于部分空间可以放坡,部分垂直支护,对水平和垂直位移要求严格的工程。

The combination of SMW construction method+inclined throwing support and slope surface hanging net shotcrete combined with pipe well dewatering is suitable for construction sites with high groundwater level,some requiring vertical support and some sloping.The support system adopts the SMW construction method at the position with vertical support requirements,constructs a crown beam at the top of the pile,and its inner side is combined with the inclined throwing support of section steel.In the open area,the combination mode of water stopped by SMW construction method+hanging mesh shotcrete on the slope is adopted.The construction process is simple,the construction speed is fast,and the water stop curtain can be formed quickly.The cost is low and the displacement is relatively small.It is suitable for projects where slope can be made in part of the space and some vertical support is required to have the same horizontal and vertical displacement.