Foundation pit supporting device and construction method thereof: Fid-Bau Portal

Foundation pit supporting device and construction method thereof

GAO QIANG / YU JIANJIN / GUAN ZHONGJIAN / FEI HUANGGEN / SUN FEI / WU BINHUA

The embodiment of the invention provides a foundation pit supporting device. The foundation pit supporting device comprises a front-row steel sheet pile, a rear-row steel sheet pile and an interlocking type steel box girder. The front-row steel sheet piles and the rear-row steel sheet piles are symmetrically arranged and form included angles with the vertical plane, and the longitudinal sections are trapezoids with narrow upper parts and wide lower parts; and the interlocking type steel box girder is fixedly connected to the upper ends of the front-row steel sheet piles and the rear-row steel sheet piles. The embodiment of the invention further provides a construction method of the foundation pit supporting device. The method comprises the steps of construction preparation, measurement and positioning, determination of the model and specification of a steel sheet pile, determination of the model of a pile driver and piling, installation of an interlocking type steel box girder, real-time detection of a foundation pit monitoring instrument, installation of a prestressed screw rod, grouting of the bottom of the prestressed screw rod and recovery of the foundation pit supporting device.

本说明书实施例提供一种基坑支护装置，包括前排钢板桩、后排钢板桩和互锁式钢箱梁；前排钢板桩和后排钢板桩与竖直面成夹角设置，且对称设置，纵截面呈上窄下宽的梯形；互锁式钢箱梁固连在前排钢板桩和后排钢板桩的上端部。本说明书实施例还提供了基坑支护装置的施工方法，该方法包括：施工准备、测量定位、确定钢板桩的型号及规格、确定打桩机型号并打桩、安装互锁式钢箱梁、基坑监测仪器实时检测、安装预应力螺旋杆、预应力螺旋杆底部注浆、基坑支护装置回收。

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