预成孔型钢水泥土搅拌桩在某深基坑中的应用

Application of Soil Mixed Wall Inserted with Hot Rolled Steel Beam in to Preformed Hole for a Deep Excavation Support Project

以武汉市江夏区荆楚大厦项目深基坑工程实践为研究背景,主要介绍了预成孔型钢水泥土搅拌桩这一新型支护排桩形式结合热熔可回收式锚索在武汉老粘土地区深基坑中的应用。该深基坑采用预成孔型钢水泥土搅拌桩+一层钢筋混凝土水平支撑+一道热熔可回收式锚索(局部设置)的支护形式。基坑监测数据表明,支护结构自身变形及基坑周边建(构)筑物的沉降可控制在合理范围内,同时也能有效降低施工成本及节省施工工期,可为老粘土地区深基坑类似设计与施工提供借鉴。同时,也对基坑在开挖过程中遇到较典型的“基坑超挖”进行了浅析。

This paper presents a deep excavation support case history of Jingchu Mansion in Jiangxia District,Wuhan City.The application of soil mixed tangent pile wall inserted with hot rolled steel beams into the preformed hole plus the reusable hot formed ground anchor in the deep excavation in the Wuhan old clay strata is the focus of this paper.The deep excavation used soil-cement mixed column tangent pile wall with hot rolled steel beam inserting into preformed holes plus one layer of reinforced concrete waler plus some local hot formed reusable ground anchors as the supporting structure.The excavation monitoring data indicate that,both the deformation of the supporting structures and the settlement of the adjacent buildings and utilities are controlled within the acceptable range.The innovative supporting structure could effectively reduce the construction cost and shorten the construction schedule and further provides references for the excavation supporting in similar conditions.The typi-cal construction problems such as excessive excavation are also discussed in the paper.