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某大桥有φ1.25m 钻孔灌注桩300多根,桩长在40--70多米,相当大的一部分为深孔桩。在钻孔工序中,成功地应用膨润土浆护壁、气举反循环清渣以及重锤高落点破岩(孤石)等工艺,克服了地质复杂和海上深孔钻进等一系列困难,积累了不少经验,取得了比较满意的成绩。但在钻孔、成桩中,特别是深孔灌注桩水下混凝土时,由于技术措施有缺陷,施工人员对灌注深孔桩水下混凝土的要害问题缺乏经验,同时在有关施工规范规程上理解不深,屡次速规操作。教训是深刻的,现总结于下。
A bridge has φ1.25m bored piles more than 300 roots, pile length 40 - 70 meters, a considerable part of the deep hole piles. In the drilling process, the successful application of bentonite slurry retaining wall, gas lift reverse circulation slag removal and hammer high rock breaking (bouldering) and other processes to overcome the complex geological and deep sea drilling a series of difficulties and accumulated A lot of experience and achieved satisfactory results. However, when drilling and forming piles, especially for deep-hole grouting piles, due to technical defects, construction workers lack experience in the key issues of underwater pours for pours deep piles. Meanwhile, it is understandable in the regulations on construction practices Not deep, repeated regular operation. The lesson is profound, now summarized in the next.