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一般的高速公路改扩建工程常常采用路基两侧拼接加宽的方式为主要设计方案,由原来的双向4车道对称拓宽为8车道,为确保路基稳定,减小新老路基差异沉降,拼接部分以路基沉降为主要控制对象。文章提出采用预应力管桩地基处理技术对桥头路堤、涵洞通道基底台背、高填方路段进行了地基处理,结合预应力管桩在高速公路扩建工程复合地基处理中的应用,对其施工技术、质量控制标准进行了探讨,可为相关工程提供参考。
The general highway expansion project often use both sides of roadbed splicing widening as the main design options, from the original two-way symmetrical 4 lane widening to 8 lanes, in order to ensure the stability of subgrade, reducing the differential settlement of new and old subgrade, splicing part Subgrade settlement as the main control object. In this paper, the foundation treatment of bridgehead embankment, foundation back of culvert tunnel and high fill road section are proposed by using pretreatment pipe pile foundation treatment technology, combined with the application of prestressed pipe piles in the treatment of composite foundation of expressway expansion project, the construction technology , Quality control standards were discussed, can provide reference for related projects.