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1问题的提出萧山风情大道立交桥位于浙赣线萧山-长河间K18+326.7(下行)处,建设规模为三孔6m-16m-6m的铪箱形桥,结构高度为6.9m,穿越上下行正线,箱身长度为20.5m,边孔入口端和出口端分别接长3.6m和4.9m的铪开口箱,采用顶进法施工。根据设计文件,箱形桥基底位于淤泥质粘土层上,地基土容许承载力为σ0=80kPa,为防止箱形桥在顶进过程中产生过大低头,提高地基承载力,基础在箱形桥顶进过程中采用压入铪方桩加固。由于工期要求紧,设计文件采用的施工方案是:在下行线侧开挖工作坑,预制铪箱形桥;在预制铪箱形桥的同时,利用两孔D24型低高度便梁加固线路,先
1 PROBLEM PROTECTION Xiaoshan style Avenue overpass is located at Xiaoshan-Changhe K18 + 326.7 (down) office of Zhejiang-Jiangxi line, with a construction scale of hafnium box-shaped bridge of 6m-16m-6m with three holes and a height of 6.9m. Line, the length of the box is 20.5m, side entrance and exit side of the hole respectively, then the length of 3.6m and 4.9m of hafnium open box, using the jacking construction. According to the design documents, the box-shaped bridge base is located on the silt clay layer, the allowable bearing capacity of the foundation soil is σ0 = 80kPa. In order to prevent the box-shaped bridge from generating excessive bow in the jacking process and improving the foundation bearing capacity, The process of pressing into hafnium square pile reinforcement. Due to the tight schedule requirements, the design documents used in the construction program are: excavation work pits in the downlink side, prefabricated hafnium box-shaped bridge; in the prefabricated hafnium box-shaped bridge at the same time, using two holes D24 low height beam to reinforce the line, the first