摘要
佛山里水大道跨线桥分西、中、东三幅上跨广佛高速,为消除安全隐患、提升道路使用空间,需拆除并重建里水大道广佛跨线桥。针对西幅跨线桥改造所采用的架桥机法对交通影响大、安全风险高、效率低等问题,提出采用整体移运法快速改造中、东幅跨线桥。为提高施工的安全性,降低对交通的影响,采用分批次架设,梁体、墩柱首先在路外封闭区域预制,然后封闭交通,利用驮运子系统将梁体及墩柱快速移运至桥位,墩柱通过快速连接子系统与承台临时固定后移除驮运子系统,随后恢复原交通,最后进行墩柱永久固结施工。通过预制墩柱快速连接子系统和驮运子系统实现了墩、梁同步快速安装,解决了整体移运法在混凝土小箱梁安装过程中梁体易开裂的问题。实践证明,整体移运法具有施工效率高、交通影响低、安全性高、适应性强的优点。
The Lishui Avenue Overpass in Foshan City consists of three parallel superstructures(the west,the central and the east)that span over Guangzhou-Foshan Expressway.To prevent the likely transportation risks and widen the carriageways,it was determined to reconstruct the overpass.An accelerated construction method of using self-propelled modular transporters(SPMTs)to integrally remove the original central and west superstructures and install the new superstructures and piers is proposed,which brings less disturbance to the traffic below,compared to the utilization of gantry cranes in the west superstructure,resulting in reduced safety risk and improved construction efficiency.To minimize the safety risk and traffic disturbance,the girders and piers were fabricated off site,and integrally transported to the bridge site using the SPMTs.With traffic closed,the piers were temporarily-connected with an installation subsystem and the pile caps,and the SPMTs drove away,and the traffic was resumed.Afterwards,the piers were permanently connected.The piers and the superstructures were rapidly installed in parallel due to the utilization of the rapid connection subsystem of the prefabricated piers and the SMPTs,and the cracking of the small concrete box girders during the installation by SMPTs was significantly alleviated.The engineering practice proves that the proposed integral transportation and accelerated construction method improves the construction efficiency,reduces traffic disturbance,and improve the safety level of the project,which will have potential utilization in similar projects.
作者
孙博文
朱世峰
SUN Bowen;ZHU Shifeng(CCCC Special Engineering Technology Co.,Ltd.,Wuhan 430071,China;National Engineering Research Center for High-Efficiency Maintenance and Safety and Durability of Highways and Bridges(Wuhan),Wuhan 430071,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2024年第2期145-151,共7页
Bridge Construction
基金
国家自然科学基金项目(51778094)
国家重点研发计划项目(2017YFC0806008)
交通运输行业重点科技项目(2021-ZD1-035)。
关键词
跨线桥
混凝土桥
整体移运法
预制墩柱
墩、梁同步快速安装
驮运子系统
桥梁改建
overpass
concrete bridge
integral transportation
prefabricated pier
synchronized pier and girder installation
SMPT
bridge reconstruction
