摘要
福建省沙埕湾跨海大桥位于台风频发地区,桥位地形为丘陵山区,施工条件恶劣。南引桥主梁采用钢混组合梁形式,桥梁标准跨径80 m,墩高超过50 m,其中钢槽梁采用顶推施工工艺。针对南引桥钢槽梁顶推施工经历的高墩、大跨径、曲线等特点,为确保南引桥钢槽梁顶推施工安全可靠,分析了施工阶段钢槽梁切向顶推的横向偏移规律,使用有限元对顶推过程中梁体所受应力进行了分析模拟及计算,最终选择以减小主梁顶推时最大悬臂状态的负弯矩为目的的轻质导梁。设计了箱型变截面承载梁体系作为托梁,设计了多点同步顶推控制系统以实现顶推过程中的远程操作及千斤顶的同步性,提出了中间不设临时墩和墩旁支架的钢槽梁步履式顶推施工工艺。实际工程检验表明:沙埕湾跨海大桥南引桥通过该工艺成功节约成本近2000万元,施工过程安全可靠,且成桥线形平顺、美观,荷载试验结果及应力分析数值均满足规范及设计要求。该工艺既保证了施工过程中的安全,又节省了工程造价,该顶推施工技术可以为今后类似大跨度、大曲率、高墩身桥梁顶推施工所借鉴。
The Shachengwan Sea-crossing Bridge in Fujian Province is located in a typhoon-prone area,the terrain of the bridge is hilly and mountainous area,the construction environment is poor.The main beam of south approach bridge adopts steel-concrete composite structure,the standard span of the bridge is 80 m,the piers are over 50 m high,the steel trough beam adopts incremental launching method construction technology.Aimed at the characteristics of high pier,long-span and curve of steel trough beam in incremental launching construction of south approach bridge,in order to ensure the safety and reliability of the launching construction of steel channel beam of the bridge,the transverse displacement rule of tangential launching of steel channel beam in the construction stage is analyzed,the stress of the beam in the launching process is analyzed,simulated and calculated by FE method.The lightweight guide beam is finally selected to reduce the negative bending moment of the maximum cantilever state when launching the main beam.The box type variable cross-section bearing beam system is designed as the support beam,and the multi-point synchronous launching control system is designed to realize the remote operation and jack synchronization in the launching process.The walking launching construction technology of steel trough beam without temporary pier and pier side bracket is proposed.The actual engineering inspection result shows that(1)the south approach bridge of shachengwan Sea-crossing Bridge successfully saved nearly 20 million yuan by this technology,the construction process is safe and reliable,and the finished bridge is smooth and beautiful,the load test result and stress analysis values meet the requirements of the specification and design.This technology not only can ensure the safety in the construction process,but also can save the project cost.This technology can be used for reference for similar lang-span,large curvature and high pier bridge incremental launching construction in the future.
作者
杨增权
YANG Zeng-quan(Ningde Shachengwan Sea-crossing Expressway Co.,Ltd.,Ningde Fujian 355200,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2021年第3期56-62,72,共8页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
顶推施工
高墩身
大跨径
大曲率
钢槽梁
bridge engineering
incremental launching construction
high pier body
long span
large curvature
steel trough beam
