摘要
旧城区开发项目中,地下残留的旧桩(木桩、灌注桩、预制桩等)往往成为地下连续墙施工过程中非常棘手的问题。尤其是埋深较深的障碍物,只有在成槽过程中才会被发现,如果不及时处理易造成槽壁失稳并加大对周边建(构)筑物的影响。实际支护结构为空间结构,尤其对于局部切改后的地下连续墙,更是增加了空间结构分析方法的复杂性,难以应对成槽过程中发现旧桩的突发情况。基于受力特点和合理的假定,将实际钢筋笼切改后的遇障地下连续墙简化为平面问题进行分析、复核;结合实际工程案例中的不同情况进行具体分析,并考虑项目周边环境条件提出了相应的补强措施,实际证明是可行的。
In the development projects of old urban areas,the remaining old underground piles(wood piles,cast-in-place piles,precast piles,etc.)often become a very difficult problem in the construction of diaphragm wall.Especially for obstacles that are deeply buried,they are only discovered in trenching period of diaphragm wall,if not handled in a timely manner,it can easily cause instability of the groove wall and increase the impact on surrounding buildings and structures.The supporting structure is actually a spatial structure,especially for the diaphragm wall after partial cutting,which increases the complexity of spatial structure analysis methods and is difficult to cope with the sudden situation when finding old piles in trenching period.Based on the stress characteristics and reasonable assumptions of diaphragm wall,simplify diaphragm wall which the reinforcement cage has been cut and modified into a plane problem for analysis and review;Specific analysis was conducted based on different situations in actual engineering cases,and corresponding reinforcement measures were proposed considering the surrounding environmental conditions of the project,which has been proven feasible in practice.
作者
高洪健
于晓东
李守庆
GAO Hongjian;YU Xiaodong;LI Shouqing(Tianjin Geo-Engineering Institute of Investigation&Surveying Design Co.,Ltd.,Tianjin 300191,China;China Railway Construction Group Co.,Ltd.,Beijing 100040,China)
出处
《建筑结构》
北大核心
2023年第S02期2629-2635,共7页
Building Structure
关键词
基坑支护
软土地区
地下障碍物
地下连续墙
钢筋笼切除
嵌固段补强
foundation pit support
soft soil area
underground obstacle
diaphragm wall
excision of reinforcement cage
reinforcement measure
