杭温铁路主跨216m钢混刚构连续梁桥总体设计及技术创新  

Technological Innovation and Overall Design of the Hybrid Girder Continuous Frame Bridge with Main Span of 216 m on Hangzhou-Wenzhou Railway

作　　者：杨朝龙[1,2] YANG Chaolong(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;China Railway Construction Bridge Design and Research Branch,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]中铁建大桥设计研究院,武汉430063

出　　处：《铁道标准设计》2023年第2期77-83,共7页Railway Standard Design

基　　金：中铁第四勘察设计院集团有限公司科技研究开发项目(2019K002);中国铁路上海局集团有限公司科技研究开发项目(2020136)。

摘　　要：新建杭温铁路永嘉右行线跨甬台温特大桥采用(100+216+100) m钢混刚构连续梁桥跨越楠溪江。该桥主跨采用钢混混合梁形式,中跨跨中82 m采用单箱双室钢箱梁,其余主梁采用单箱单室混凝土梁;钢梁与混凝土梁之间通过4 m长的钢混结合段连接;刚臂墩采用矩形空心墩,基础采用钻孔灌注桩基础。该桥混凝土主梁采用悬臂浇筑施工,跨中钢箱梁部分采用工厂制造、桥面吊机整体吊装的方式施工,极大地缩短了工期;采用“一端先永久连接,另一端精确配切合龙”的方法进行大尺寸、大质量钢箱梁的整孔吊装合龙,很好地解决了钢结构之间“硬合龙”的难题;将墩高较矮的主墩由刚臂墩替换为带支座的常规桥墩,减少了结构的超静定次数,更有利于结构的受力;相比于已在铁路箱形混合梁中较为成熟的有格室前后承压板式钢混结合段,本项目采用了带PBL连接件和剪力钉的有格室后承压板方案很好地实现了力的顺畅传递;体外预应力索的设置有效地减小了连续刚构桥后期徐变变形大的问题。The Yongjia right line super-large bridge on the newly-built Hangzhou-Wenzhou Railway adopts(100+216+100) m hybrid girder continuous frame bridge to cross Nanxijiang River. The main girder of the bridge is in the form of steel-concrete mixed beam, the middle span of 82 m employs single box double chamber steel box girder, and the other main beams uses single box single chamber concrete beam. The steel beam and concrete beam are connected by 4 m long steel-concrete joint section. The rigid arm piers are rectangular hollow piers, and the foundations are of bored pile. The concrete girder of the bridge is constructed by cantilever pouring, and the middle span steel box girder is built with factory manufacturing and integral hoisting is performed by deck crane, which greatly shortens the construction period. The whole section hoisting closure of large-size and heavy-weight steel box girder is carried out by using the method of “permanent connection at one end and accurate cutting closure at the other”, which solves the problem of “hard closure” between steel structures. The rigid frame pier with lower pier height is replaced by conventional pier with support, which reduces the number of statically indeterminate times of the structure and is more conducive to the stress of the structure. Compared with the relatively mature steel-concrete joint section with front and rear pressure plates in railway box hybrid beams, the project follows the scheme of rear pressure plate with PBL connectors and shear nails, which realizes the smooth transmission of force. The setting of external prestressed tendon effectively reduces the large creep deformation in the later stage of continuous rigid frame bridge.

关 键 词：铁路桥 刚构-连续梁 钢-混结合段 混合梁 总体设计 体外索 大节段钢箱梁 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U448.38[交通运输工程—道路与铁道工程]