特殊地形下污水泵站基坑支护与施工

Support and Construction of Deep Foundation Pit of Wastewater Pumping Station in Special Area

某污水泵站西侧紧邻古运河道,东侧位于解放环路人行道下的特殊地段,泵站施工时采用上部拉森钢板桩支护开挖与下部沉井施工相结合的方法,不仅解决了沉井因上部原有石砌驳岸基础无法下沉的问题,而且还解决了因大开挖基坑较深,无法保证邻近城市主干道的正常通行,且施工期相当紧张的问题。运用此种支护与施工方法,具有基坑开挖深度浅、变形小、降水措施简单、施工工期短等优点,可为相关工程施工提供借鉴。

A pumping station is close to age-old canal in the west and under the sidewalk of Jiefang Circle Road in the east. In the construction, the combined method of Larsen steel sheet pile for support at the top and open caisson construction at the bottom was adopted. Problems were solved, such as the difficult sinking of the open caisson due to the stone bank at the top, the abnormal road traffic due to excavation of deep foundation pit and the short construction period. The combined method has advantages of shallow pit depth, small deformation, simple dewatering measure, short construction period and so on. It can provide reference for construction of similar projects.