铁路连续梁顶升法更换支座技术方案研究  

Research on Technical Scheme of Railway Continuous Girder Bearing Replacement by Jacking Method

作　　者：孙明德 班新林 臧晓秋 曹志峰 董亮 刘文荐 SUN Mingde;BAN Xinlin;ZANG Xiaoqiu;CAO Zhifeng;DONG Liang;LIU Wenjian(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Engineering Management Center,CHINA RAILWAY,Beijing 100844,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国国家铁路集团有限公司工程管理中心,北京100844

出　　处：《铁道建筑》2021年第8期36-39,共4页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2020YJ117)。

摘　　要：以一座在建(48+80+48)m铁路连续梁桥3#墩的球型支座为例,分析支座变形原因,提出单墩顶升梁体更换支座的整治方案。采用数值模拟方法分析了不同顶升高度时的梁体应力,根据计算结果确定支座更换时梁体的安全顶升高度。结果表明:支座下座板异常变形是由砂浆垫层局部区域支承强度不足引起;在3#墩处顶升梁体对相邻两侧梁体应力影响较大;施加二期恒载前后在3#墩处顶升5~30 mm时梁体顶底板应力均满足规范要求,建议梁体顶升高度取20 mm。Taking the spherical bearing of a(48+80+48)m railway continuous girder bridge 3#pier under construction as an example,the causes of bearing deformation were analyzed,the treatment scheme of jacking girder of single pier and replacing the bearing was put forward.The girder stresses at different jacking heights were analyzed by numerical simulation method,and the safe jacking height of the girder was determined according to the calculation results.The results show that the abnormal deformation of the bottom slab under the bearing is caused by the insufficient support strength in the local area of the mortar cushion.Jacking girder at 3#pier has a great influence on the stress of adjacent girders on both sides.Before and after applying secondary dead load,when the 3#pier is jacked for 5~30 mm,the stresses of the top and bottom slabs of the girder meet the specification requirements.It is recommended that the jacking height of the girder be 20 mm.

关 键 词：铁路连续梁 桥梁支座 支座更换 整治技术 有限元分析 球型支座 梁体顶升 支承强度 

分 类 号：U443.36[建筑科学—桥梁与隧道工程] U448.215[交通运输工程—道路与铁道工程]