跨越既有繁忙铁路连续梁转体施工关键技术  

Key Construction Technology of Continuous Girder Rotation Crossing the Existing Busy Railway

作　　者：户东阳[1] 周昆[1] 陈玉峰 保亮 HU Dongyang;ZHOU Kun;CHEN Yufeng;BAO Liang(Kunming Survey,Design and Research Institute Co.,Ltd.of CREEC,Kunming,Yunnan 650200,China)

机构地区：[1]中铁二院昆明勘察设计研究院有限责任公司,云南昆明650200

出　　处：《施工技术（中英文）》2022年第3期134-137,共4页Construction Technology

基　　金：中铁二院科研项目(KYY2018059(18-20))。

摘　　要：渝昆高铁八家村2号特大桥采用(70+128+70)m预应力混凝土连续梁跨越既有沾昆铁路,该桥21,22号墩连续梁T构采用水平转体法施工。既有繁忙铁路上跨新建铁路施工,受既有铁路运营与工期等因素影响,技术含量高,施工难度大。以八家村2号特大桥转体系统为研究对象,针对施工难点,对转体球铰选型、转体过程中的受力、牵引系统牵引力、惯性制动距离等关键参数进行计算,对连续梁转体施工关键技术进行研究,确保转体施工过程顺利进行,保证合龙精度。The No.2 super-large bridge of Bajiacun in Chongqing to Kunming high-speed railway adopts(70+128+70)m prestressed concrete continuous girder crossing the existing Zhanyi to Kunming railway.The T-frame of No.21 and No.22 pier continuous girder bridge is constructed by horizontal rotation method.The construction of the existing busy railway crossing the new railway is affected by factors such as the operation and construction period of the existing railway,which has high technical content and is difficult to construct.Taking the rotation system of No.2 super-large bridge in Bajiacun as the research object,aiming at the engineering construction difficulties,the key parameters such as the selection of rotation spherical hinge,the force in the rotation process,the traction force of the traction system and the inertia braking distance are calculated,and the key technologies of the rotation construction of the continuous beam are studied to ensure the smooth progress of the rotation construction process and the closure accuracy.

关 键 词：桥梁工程 铁路 连续梁桥 预应力 混凝土 转体施工 

分 类 号：U445[建筑科学—桥梁与隧道工程]