摘要
浙江省淳安县环湖公路上江埠大桥1号桥主桥为(77.5+7×130+77.5)m刚构连续梁组合体系桥,采用深水桩基、高桩承台,合龙口多,体系转化复杂,施工监控难度大。采用有限元软件计算主梁线形和结构内力,对施工过程关键截面的应力、温度及关键工况的线形进行监测,并将实测结果与计算值进行对比。为保证全桥合龙后主墩受力合理,计算桩基对次中跨合龙顶推施工的影响,确定3号与4号墩、5号与6号墩次中跨合龙锁定前在合龙口用千斤顶朝边跨方向对称顶推主梁。监控结果表明,该桥主桥主梁线形和结构内力均达到了设计要求。
The main bridge of the Bridge No. 1 of Shangjiangbu Bridge on the Lake Ring Road in Chun＇an City, Zhejiang Province, is a rigid-frame and continuous girder hybrid system bridge with span arrangement （77.5＋7× 130＋77.5） m. The bridge utilizes deep water pile foundations and elevated pile caps and is characterized by a number of closure gaps, complicated system trans- formation as well as difficult construction monitoring and control. The finite element software was used to calculate the geometric shape and structural internal forces of the main girder, the stress, temperatures and load cases of the critical sections in the construction process were monitored and the results of the field measurement were compared to those of calculation. To ensure the rational force conditions of the main piers after closure of the whole bridge, the effect of the pile foundations on the incremental launching construction for closure of the secondary central spans was calculated and it was determined that before the closure and locking of the central spans on Piers No. 3 -No. 4 and Piers No. 5 - No. 6, the main girder was to be symmetrically pushed towards the side spans by jacks at the closure gaps. The monitoring and control indicate that the geometric shape and structural internal forces of the main girder of the bridge can all meet the design requirements.
出处
《世界桥梁》
北大核心
2011年第4期33-35,41,共4页
World Bridges
关键词
梁式桥
线形
应力
顶推
有限元法
施工监控
girder bridge
geometric shape
stress
incremental launching
finite element method
construction monitoring and control
