明挖法下穿通道涉既有桥梁桩基托换施工技术分析  

ANALYSIS ON PILE FOUNDATION UNDERPINNING CONSTRUCTION TECHNOLOGY OF EXISTING BRIDGE INVOLVED IN OPEN CUT UNDERPASS

作　　者：吕显福 毕经东 Lyu Xian-fu;Bi jing-dong

机构地区：[1]中铁隧道勘测设计院有限公司,天津300133 [2]中铁第六勘察设计院集团有限公司,天津300133

出　　处：《建筑技术开发》2022年第3期30-32,共3页Building Technology Development

摘　　要：伴随着城市的发展,城市用地空间日益紧张,后建工程不可避免地与既有桥梁发生位置冲突,桩基托换技术越来越多地应用于市政工程项目中。对明挖基坑内既有桥梁桩基被动托换的设计及施工方案进行分析,并建立数值模型,总结基坑开挖和桩基托换过程中的桩基变形行为,提出合理化建议,可对类似工程提供参考。With the development of the city,the urban land space is becoming increasingly tight,and the post construction projects are inevitably conflicted with the existing bridges.Pile foundation underpinning technology is more and more used in municipal engineering projects.The paper analyzes the design and construction scheme of passive underpinning of existing bridge pile foundation in open excavation foundation pit,establishes a numerical model,summarizes the deformation behavior of pile foundation in the process of foundation pit excavation and pile foundation underpinning,and puts forward reasonable suggestions,which can provide reference for similar projects.

关 键 词：明挖基坑 桩基托换 切桩 数值分析 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]