Bridge foundation deep foundation pit excavation construction method: Fid-Bau Portal

Bridge foundation deep foundation pit excavation construction method

FANG WEIDU

The invention discloses a construction method for excavation of a deep foundation pit of a bridge foundation. The construction method comprises the following steps: surveying and setting out: surveying and setting out a construction site for excavation of the deep foundation pit of the bridge foundation by adopting a total station; the excavation wall face of the foundation pit is protected through hanging net guniting, and the foundation pit with the excavation depth smaller than or equal to 4 m is excavated in a sloping mode; a closed steel cofferdam support is formed by adopting Larsen steel sheet piles in a foundation pit with the excavation depth larger than 4 m; monitoring and accepting the foundation pit: monitoring the settlement displacement of the foundation pit support structure in the excavation process of the foundation pit and after excavation, and accepting the foundation pit according to the acceptance standard after the excavation of the foundation pit is completed. According to the construction method, different excavation modes are adopted for the deep foundation pits with different depths, the stability of the foundation pits is improved, and the construction quality is guaranteed.

本发明公开了一种桥梁基础深基坑开挖施工方法，包括：测量放样：采用全站仪对桥梁基础深基坑开挖施工场地进行测量，放线；基坑开挖：对基坑开挖壁面采用挂网喷浆防护，开挖深度小于等于4m的基坑采用放坡开挖；开挖深度大于4m的基坑采用拉森钢板桩形成封闭钢围堰支护；基坑监测与验收：基坑开挖过程中以及开挖后对基坑围护结构的沉降位移进行监测，基坑开挖完成后根据验收标准对基坑进行验收。本发明的施工方法针对不同深度的深基坑采用不同的开挖方式，提高了基坑的稳定性，保证了施工质量。

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