摘要
北京新机场地下综合管廊需要在既有桥梁承台之间进行深基坑开挖施工,深基坑的开挖造成承台和部分桩基外露,影响既有桥梁下部结构的稳定性。施工通过注浆孔布置、注浆深度、注浆顺序及开挖顺序的设计,确保了开挖土体的稳定性,同时补偿了桩基外露而减小的摩擦阻力,保证了既有桥梁下部结构的稳定性。
The excavation and construction of the deep foundation pit of an underground utility tunnel in Beijing new airport are to be carried out between the existing pile caps,and the excavation of the deep foundation pit leads to the exposure of the caps and part of piles,which influences the stability of existing substructure.By designing the layouts of grouting holes,grouting depth,grouting sequence and excavation sequence,the stability of excavated soil is ensured,the decrease of friction resistance due to the exposure of pile is compensated,and the stability of substructure of the existing bridge is ensured.
作者
刘佳杰
Liu Jiajie(Beijing Municipal Road and Bridge Group Co.,Ltd.,Beijing 100045)
出处
《工程建设》
2020年第1期45-50,共6页
Engineering Construction
关键词
深基坑开挖
既有桥梁
注浆保护
承台
桩基
excavation of deep foundation pit
existing bridge
grouting protection
caps
pile foundation
