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当地基的弱土层较厚(一般指4米以上),建筑物的荷载较大,采用浅埋基础不能满足强度和变形限制要求,做人工地基又没有条件或不经济时,常常采用桩基础,钻孔灌注桩基因其造价低、节省钢筋等优点,被广泛采用。我们建的大连快轨一号桥,总长1102延长米,总计51根桩基础,桩径为3.2米、2.0米两种,深度在13—28米之间,桩基混凝土6812立方米,由于其地质情况复杂,地下水量大,设计采用了水下灌注混凝土方法。现结合我们在此桩基础水下灌注混凝土的施工体会,谈几点粗浅的质量控制方法:
When the weak foundation of the foundation is thick (generally 4 meters or more) and the load of the building is large, the foundation with shallow foundation can not meet the requirements of strength and deformation limits. When the artificial foundation is no condition or uneconomical, pile foundation , Bored pile gene its low cost, save the advantages of steel, is widely used. Dalian Rapid Rail Bridge No. 1 built by us has a total length of 1102 meters and a total of 51 pile foundations, with a pile diameter of 3.2 meters and 2.0 meters. The depth is between 13 and 28 meters, and pile foundation concrete is 6812 cubic meters. Because of its Geological conditions are complex, large amounts of groundwater, the design uses underwater concrete pouring method. Now we are in the foundation of underwater concrete pouring concrete construction experience, talk about a few superficial quality control methods: