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青温铁路杨柳中桥、步云小桥的河床工程地质是:在砂粘土下,有3.0～3.3m细砂层,地下水位高,常年处于过饱和状态。桥墩台基础须穿过流砂层,置于砂卵砾石层上。根据这一情况,在查阅有关资料的基础上,提出了钢组装矩形沉井挖基方案。其设计原理为:将角钢用螺栓及电焊组装成一个矩形骨架,承受钢板传来的荷载;在角钢骨架四周插钢板,挡住流砂泥土,直接承受水土的压力。其特点是:①可多次周转使用,打破了以往施工沉井不回收或当作主体构件一部分的习惯做法;②在设计取值上,突破了一般沉井设计的范围;③构件轻,最重构件302kg,人力组装拆卸方便;④利用钢板与土壤附着力最小时拆除沉井。钢组装矩形沉井经济效益好,仅两座中小桥,5次周转,实现经济效益32656元。在冲积平原的河流上修建铁路、公路、市政桥梁工程,遇到基础要穿过流砂层时,均有推广、使用价值。
Qingyang railway bridge in Yangliu, step cloud bridge riverbed engineering geology is: in the sand clay, there are 3.0 ~ 3.3m fine sand layer, groundwater level is high, all year round in the state of oversaturation. Pier abutment base to go through the sand layer, placed in sand and gravel layer. According to this situation, on the basis of referring to the relevant data, a scheme of steel assembly rectangular caisson dredging was proposed. The design principle is: the angle with bolts and welded into a rectangular frame, to withstand the load from the plate; steel plate inserted around the corner of the skeleton, blocking the flow of sand and soil, directly to withstand the pressure of water and soil. Its features are: ① can be used repeatedly to break the previous caisson construction is not recycled or as part of the main body of the customary practice; ② in the design value, breaking the scope of the general design of caisson; ③ lightweight components Reconstruction of 302kg, easy assembly and disassembly of human; ④ the use of steel and soil adhesion when the minimum removal of caisson. Rectangular metal well assembly economic benefits of steel caisson, only two small bridges, 5 turnover, to achieve economic benefits of 32,656 yuan. In the alluvial plain of the river to build railways, highways, municipal bridge project, encounter the foundation to go through the sand layer, have promotion, use value.