沧德特大桥基坑支护方案设计与施工技术

The Design of and the Construction Techniques for the Supporting Scheme for the Foundation Pit of the Cangde Mega Bridge

根据沧德特大桥的工程实际,通过对地质条件和周边环境分析,最终确定了拉森钢板桩和型钢作为支护结构。由于临近既有线,为了减少施工对临近京沪线的影响,临近铁路区域采用了拉森钢板桩的施工方案。为了减小支护结构周边的沉降,采用了大刚度的的腰梁和内撑结构,并且采用基坑专业软件对防护结构进行了计算,还编制了相应的施工具体方案。目前基坑已按照要求回填完毕,计算结果与实测值基本一致,施工过程安全。

According to the pract ical engineering condit ions of the Cangde Mega Bridge.the Larsen steel sheet pi les and shape steels are chosen as the supporting structures through the analysis of the geological conditions and the surrounding environment of the project. Owing to the fact that the project neighbors an existing railway.the construction scheme of the Larsen steel plate pi les is adopted for the construction in the rai lway-neighboring section so as to reduce the effect of the construction on the neighboring Beijing-Shanghai Railway. To reduce the settlement around the support structure. the waist beams of great stiff-ness and the internal support structure are adopted. The protective structure is analyzed and calculated by means of the profes-sional software for foundation pits,with the specific corresponding construction scheme worked out. Now,the backfill of the foundation pit is already completed as required. The calculated results and the real measured results are found to be in full agreement with each other. And the whole process of construction is also safe.