地铁施工影响下既有桥梁桩基沉降的主动补偿方法  

An Active Compensation Method for the Pile Foundation Settlement of an Existing Bridge Influenced by Metro Construction

作　　者：苏洁[1] 张顶立[1] 杨广武 牛晓凯[1,3] 赵江涛[1] 

机构地区：[1]北京交通大学隧道与地下工程教育部工程研究中心,北京100044 [2]北京市重大项目建设指挥部办公室,北京100029 [3]北京市市政工程研究院,北京100037

出　　处：《现代隧道技术》2015年第3期39-46,共8页Modern Tunnelling Technology

基　　金：国家自然科学基金"青年"基金项目(51308036);中央高校基本科研业务费专项资金资助项目(2012JBM079);国家重点基础研究发展计划(973)项目(2010CB732102)

摘　　要：在新建地铁线路穿越既有桥梁施工过程中,传统的被动防护措施存在可控性差、桥梁前期沉降无法弥补甚至有时难以实施等不足。鉴于此,文章提出了既有桥梁桩基沉降的主动补偿方法。该法将桥梁上、下部结构分别按两个独立单元考虑,在实施过程中,通过确定合理的关键技术参数,运用由计算机控制的顶升设备,并在自动化监测系统的保障下,对上部结构的沉降进行主动调整,使其始终保持在安全姿态。该项技术在北京地铁7号线穿越双井桥工程中得到了成功应用。In response to poor controllability and difficulties with compensating for early settlement by conventional passive protective measures during metro construction beneath existing bridges, an active compensation method for pile foundation settlement of an existing bridge is presented in this paper. The upper and lower structures of the bridge are considered as two separate units—specifically, settlement of the upper part is actively adjusted using the help of an automatic monitoring system to keep it in a safety state by means of determining the rational key technical parameters and applying computer-controlled jacking-up devices. This technique has been successfully applied to the construction of Beijing Metro Line 7 beneath the Shuangjing Bridge.

关 键 词：地铁工程 桥梁工程 桩基沉降 主动顶升 主动补偿 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]