复杂地质及周边环境超长全回转全套管灌注桩施工技术

Construction Technology of Ultra Long Filling Pile with Full Rotary Casing Method Under Conditions of Complex Geology and Surrounding Environment

针对福建罗源钢坯打捞工程围护桩施工遇到的问题,分别从复杂地质条件下全套管掘进钻孔工艺、桩身垂直度控制、混凝土凝固时间及拔管控制等方面,提出了长度达63m的超长全回转全套管灌注桩施工技术。基坑开挖完成后,围护桩的成桩质量及效果明显优于泥浆护壁灌注桩,验证了技术的可行性。该技术无污染、适用条件广、对周边扰动小、成桩效果好,能够有效在各种复杂地质条件及周边环境下施工,具有良好的社会效益和经济效益。

During the construction of salvage billet project in Luoyuan Fujian,the technology of ultra-long filling piles with full rotary casing（TUFPFRC） was adopted to build the retaining structure. The difficulties encountered during construction were discussed. The drilling technology,verticality control,concrete solidification speed,and case pulling control were studied in detail in conditions of complex geology and surrounding environment. The TUFPFRC for the length of 63 m was proposed. According to the test results,the quality of filling pile by TUFPFRC was much better than the one by the method of slurry wall. The TUFPFRC has many advantages such as non-pollution,wide application condition,small disturbance to surrounding,and good effect of pile. This technology can be used to construct filling pile for various conditions complex geology and surrounding environment. Social and economic effectiveness is significant.