Construction method for slope excavation-free foundation pit supporting structure: Fid-Bau Portal

Construction method for slope excavation-free foundation pit supporting structure

LI YING / DAI SHIAN / CAI XINYUE / GAO YING / LIU YIFAN

The invention discloses a construction method for a slope-free excavation foundation pit supporting structure, which is used for underground space structure construction and comprises the following construction steps of: 1, drilling and placing a reinforcement cage; secondly, concrete is poured into the drilled hole to form a pile; thirdly, a foundation pit is excavated; fourthly, a soil retaining plate is installed; fifthly, a crown beam is installed; sixthly, supporting rods are erected; seventhly, remaining soil bodies continue to be excavated to the position of a bottom plate of the underground space structure, and the underground space structure is constructed; and 8, recovering the original state of the ground. According to the construction method, the measure of sloping excavation which obviously enlarges the affected area is omitted, the influence and damage of construction on ground road traffic, surrounding existing buildings and the like are greatly reduced, the supporting rods, the top beams and the soil retaining plates can be detached and reused, and the construction method is suitable for the construction of the large-scale construction from the two aspects of reducing the construction area, reducing the influence on the periphery and reusing materials. The construction cost is remarkably reduced, and meanwhile the construction efficiency and safety are improved.

本发明公开了一种免放坡开挖基坑支护结构施工方法，用于地下空间结构施工，施工步骤如下：第一步骤是钻孔并放入钢筋笼；第二步骤是在钻孔内浇筑混凝土成桩；第三步骤是开挖基坑；第四步骤是安装挡土板；第五步骤是安装冠梁；第六步骤是架设支撑杆；第七步骤是继续开挖剩余土体至地下空间结构的底板位置，施做地下空间结构；第八步骤是恢复地面原状。本发明的施工方法取消放坡开挖这一明显扩大影响区域的措施，大幅减轻了施工对地面道路交通和周边既有建筑物等的影响和破坏，且支撑杆、冠梁和挡土板可拆卸重复使用，从缩减施工面积减轻对周边的影响和重复利用材料两方面，显著降低了施工成本，同时提高了施工效率和安全性。

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