Construction method for dismounting and replacing support of ultra-deep foundation pit in sandy soil: Fid-Bau Portal

Construction method for dismounting and replacing support of ultra-deep foundation pit in sandy soil

TIAN YUDI / WANG FEILONG / LI BO

The invention relates to a support replacement construction method for an ultra-deep foundation pit in sandy soil. The support replacement construction method comprises the following steps that firstly, preparation is conducted before support replacement; the method comprises the following steps: 1, arranging a force transmission belt, pouring concrete to the top surface of a foundation slab, and removing a concrete support; 2, various original data before support dismounting are obtained, and the foundation pit is detected; 2, a force transmission belt is arranged; a force transmission belt is arranged between the foundation pit supporting piles and the main body structure wall, and steel pipe supports are arranged at the positions of the vertical supporting piles to support the main body structure wall; thirdly, a crane station is selected; step 4, positioning and paying off; 5, cutting a groove; sixthly, the rope sawing machine and a guide wheel are fixed; seventhly, a rope is installed; step 8, cutting; and ninthly, hoisting is conducted. The construction period and the construction cost of the main body structure are effectively shortened, and the secondary construction cost of support disassembly and reshipment after the main body structure is completed and plugging of the reserved hole of the main body structure support concrete outward transportation channel is reduced.

本发明涉及一种砂性土内超深基坑拆换撑施工方法，包括如下步骤：步骤一：换撑前准备；1、设置传力带，并浇筑混凝土至基础底板顶面，拆除混凝土支撑；2、获取拆撑前的各项原始数据，对基坑进行检测；步骤二：设置传力带；基坑支护桩与主体结构墙之间设置传力带，并在竖托桩位置设置钢管撑支撑主体结构墙体；步骤三：选择吊车站位；步骤四：定位放线；步骤五：割槽；步骤六：固定绳锯机及导向轮；步骤七：安装绳索；步骤八：切割；步骤九：吊运。本发明有效缩短主体结构施工工期和施工成本，减少主体结构完成后拆撑倒运和主体结构支撑混凝土外运通道预留洞封堵的二次施工成本。

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