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文章以沪宁高速公路扩建工程软基处理施工为例,为了避免静压式预应力薄壁管桩给新老路结合部留下隐患以及降低特殊条件下的施工难度,将部分位置的预应力管桩、湿喷桩改为素混凝土桩,保证了新老路的拼接质量,加快了施工进度。文章从施工工艺、质量、便宜性及经济性等角度分析了素混凝土与管桩、湿喷桩等的优缺点,并分析了其变更机理,针对实际施工现场,对素混凝土桩施工工艺进行了总结。
Taking the soft foundation treatment of the Shanghai-Nanjing Expressway expansion project as an example, in order to avoid the hidden danger of the static-pressure pre-stressed thin-walled pipe pile to the junction of old and new roads and to reduce the construction difficulty in special conditions, Pipe piles, wet piles replaced by plain concrete piles, to ensure the quality of new and old splicing, speeding up the construction progress. The article analyzes the advantages and disadvantages of plain concrete, pipe pile, wet jetting pile and so on from the aspects of construction technology, quality, economy and economy, and analyzes its changing mechanism. According to the actual construction site, the construction process of plain concrete piles to sum up.