锚杆静压桩联合截桩法在纠偏加固中的应用

Application of Anchored Static Pressuring Pile Combined with Column Interception Method in Tilted Building Restoration

在我国长三角沿海地区,楼高24 m以下住宅楼多采用复合地基作为主要基础形式,由于其地质环境的特殊性,既有建筑物建成后偶现不均匀沉降情况,而既有建筑物常规纠偏加固工艺工期较长且成本昂贵。以江苏省启东市某既有建筑物基础纠偏加固的工程为例,提出一种锚杆静压桩联合截桩法,采用有序截桩来进行楼房纠偏处理,可在满足此类建筑物纠偏处理效果的前提下,大幅降低工期要求及成本需求,并通过全程监测数据分析,得出该类方法可适用于采用复合地基的建筑楼群的纠偏处理。

In the coastal areas of the Yangtze River Delta area,the soil improved composite ground is the most widely used foundation type for the multi-story residential buildings with a total height below 24 meters.Due to its special geological and geotechnical environment,there are occasional differential settlements occurred after the completion of these residential build-ings.To mitigate the differential settlements in these buildings,the conventional improvement methods usually have a long con-struction duration and are often costly.This paper presents a case history of a tilted existing residential building restoration in Qidong City,Jiangsu Province by using the anchored static pressuring pile combined with interception pile method.The exist-ing building was improved by soil-cement mixing columns.Throughout the planned interception of the existing soil-cement col-umns,this method can restore the tilting and at the same time,significantly reduce the construction duration and the cost.From the construction monitoring data,this combined method can be applied in the buildings on the composite ground with a total height less than 24 meters.