Construction method for rock-socketed underground diaphragm wall of deep foundation pit: Fid-Bau Portal

Construction method for rock-socketed underground diaphragm wall of deep foundation pit

FU XINHUI / ZHAO HONGGANG / LIN QINGYANG

The invention discloses a construction method for a rock-socketed underground diaphragm wall of a deep foundation pit in the technical field of concrete pole pre-embedded foundation structures, which comprises the following steps of: 1, grabbing the rock-socketed underground diaphragm wall into a sandy-soil-shaped strong weathered granite stratum by adopting a hydraulic grab bucket trenching machine, and reserving 1-1.5 metres of sandy-soil-shaped strong weathered granite as a subsequent rotary drilling deviation rectifying and limiting stratum; secondly, main holes are constructed side by side at intervals through a rotary drilling rig, and perpendicularity is checked regularly; thirdly, auxiliary holes are constructed between every two adjacent main holes through a rotary drilling rig, and the perpendicularity is checked regularly; 4, trimming and normalizing the corner angle area where the main hole and the auxiliary hole intersect with each other by using a rotary drilling rig; according to the construction method, the construction method that the hydraulic grab bucket trenching machine and the rotary drilling rig are combined is adopted, the construction efficiency is greatly improved, and the cost is reduced.

本发明公开了水泥杆预埋基础结构技术领域的一种用于深基坑嵌岩地下连续墙施工方法，包括步骤一：采用液压抓斗成槽机抓至砂土状强风化花岗岩地层中，并预留1～1.5米砂土状强风化花岗岩作为后续旋挖钻纠偏限位地层；步骤二：采用旋挖钻并排间隔施工主孔，并定时校核垂直度；步骤三：采用旋挖钻在相邻两个主孔之间施工副孔，并定时校核垂直度；步骤四：对主孔和副孔相交的棱角区域用旋挖钻进行修边规整；步骤五：下放钢筋笼并进行浇筑，本发明采用了液压抓斗成槽机与旋挖钻相结合的施工方法，大大提高了施工工效，降低了成本。

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