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上海市地铁2号线静安寺站采用部分逆作法施工,在逆作区段由钻孔立柱桩作为承载桩,由于采用“一柱一桩”,桩身定位及桩垂直度要求极高,对沉降要求也较高。为确保承载力及沉降量的要求,该桩在施工中必须采取特殊的技术措施。 在一般工程建设中,为提高钻孔灌注桩的承载力和减少桩身沉降量,通常采用扩大桩径、增加桩长或桩底及桩周注浆等方法。在地铁2号线静安寺站施工中则采用了较新的施工工艺——竹节形钻孔灌注桩,即用特殊工艺在桩身的适当部位进行扩孔,形
The Jing’an Temple Station of Shanghai Metro Line 2 is partially inverted and is constructed by drilling upright piles in the counter-operation section. Due to the “one pillar and one pile”, the pile positioning and pile verticality are extremely demanding. Settlement requirements are also higher. To ensure the bearing capacity and settlement requirements, the pile in the construction must take special technical measures. In general engineering construction, in order to increase the bearing capacity of bored piles and reduce the settlement of the pile body, methods such as enlarging the pile diameter, increasing the pile length or grouting at the pile bottom and the pile periphery are usually adopted. In the Metro Line 2 Jing’an Temple station construction is the use of a relatively new construction technology - bamboo-shaped bored piles, that is, with a special process in the appropriate parts of the pile reaming, shaped