摘要
阜阳市向阳路颍河大桥主桥为(47+148+47)m三跨下承式梁拱组合体系钢结构拱桥,主桥上部采用搭设支架辅以跨桥高架龙门吊先梁后拱逐节对称拼装,拼装成型后进行结构体系转换,最后依次拆除梁部拼装支架.受梁下空间限制,位于梁底的上、中、下游3组贝雷梁组拆除存在一定的技术难度及安全风险.为安全、高效地对拼装支架的贝雷梁组实施拆除,借鉴浮拖法架梁的基本原理,在运输船上搭设顶升支架,通过船体浮力将贝雷梁组整体顶升并浮运出梁底,最后用大型浮吊将贝雷梁组吊装上岸.通过对各工况下的顶升支架整体应力及变形、船体稳定性进行力学分析,其结果均满足规范要求.实践证明:该拆除施工方案在技术上是可行的,保证了梁部拼装支架拆除施工安全并已获得国家发明专利.
The main bridge of Yinghe Bridge on Xiungyang Road in Fuyang City is a steel structure arch bridge with(47+148+47)m three-span through beam-arch composite system.The upper part of the main bridge is symmetrically assembled by erecting brackets and the gantry crane of the viaduct.After assembling and forming,the structural system is transformed,and the beam assembly brackets are dismantled in turn.Due to the limitation of the space under the beam,there are some technical difficulties and safety risks in the demolition of three groups of Bailey beams located at the bottom of the beam.In order to dismantle the Bailey beam group of the assembled bracket safely and efficiently,the lifting bracket is installed on the transport ship with the basic principle of beam-erecting by floating-towing method,and the whole Bailey beam group is lifted out of the bottom of the beam by the buoyancy of the hull.Finally,the Bailey beam group is lifted ashore by a large floating crane.Through the mechanical analysis of the overall stress and deformation of the jack-up bracket and the stability of the hull under various working conditions,the results meet the requirements of the code.Practice has proved that the demolition construction scheme is technically feasible,ensuring the safety of the demolition construction of the beam assembly bracket,the national invention patent has been obtained already.
作者
周伟明
Zhou Weiming(China Railway 24^th Bureau Group Anhui Engineering Co.Ltd.,Hefei Anhui 230011,China)
出处
《铁道建筑技术》
2019年第10期77-81,共5页
Railway Construction Technology
基金
中铁二十四局集团有限公司科技研发项目(科研2015-01号)
关键词
拼装支架
贝雷梁组
顶升支架
浮运
拆除
船体浮力
梁拱组合体系拱桥
assembled support
Bailey beam group
jack-up bracket
floating
dismantle
hull buoyancy
arch bridge with beam arch combination system
