Supporting and retaining method for large-diameter cantilever double-row piles near subway deep foundation pit: Fid-Bau Portal

Supporting and retaining method for large-diameter cantilever double-row piles near subway deep foundation pit

ZHOU CHANGLIN / YANG LIN / XU TIELIN

The invention discloses a supporting and retaining method for large-diameter cantilever double-row piles near a subway deep foundation pit. Comprising the following steps that a damping wall located between a deep foundation pit and a subway tunnel is built, a long-arm twist drill or a rotary drilling rig is adopted for drilling two large-diameter formed holes in a slope body of the deep foundation pit, soil is taken to a pile end bearing stratum, and a reinforcement cage is hoisted and conveyed to the pile end bearing stratum; and after a designed pile end bearing layer is reached, concrete is poured into the reinforcement cage, a beam crown is poured on the tops of the two poured pile bodies, the beam crowns are connected through a connecting beam, and the large-diameter cantilever double-row pile is formed. According to the supporting and retaining method for the large-diameter cantilever double-row piles, the technical problems that in the prior art, safety is poor, the displacement control deformation effect is poor, and construction efficiency is low are solved.

本发明公开了一种用于临地铁深基坑大直径悬臂双排桩的支挡方法，包括如下步骤：建造位于深基坑和地铁隧道之间的减震墙、采用长臂螺旋钻或旋挖钻机在深基坑的坡体钻两个大直径进成孔取土至桩端持力层、将钢筋笼吊运送至桩端持力层，到达设计的桩端持力层后向钢筋笼内浇筑混凝土、浇筑好的两个桩体的顶部浇筑出梁冠，梁冠之间通过连梁进行连接，形成大直径悬臂双排桩。本发明通过大直径悬臂双排桩的支挡方法解决了现有技术中的安全性差、位移控制变形效果差和施工效率低的技术问题。

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