不中断交通下连续箱梁桥拼接缝浇筑方式分析  

Analysis of Joint Casting Method of Continuous Box Girder Bridge under Uninterrupted Traffic

作　　者：于利存[1] 袁朝华 连萌 常丁[1] YU Li-cun;YUAN Zhao-hua;LIAN Meng;CHANG Ding(CCCC First Highway Consultants Co., Ltd, Co-Innovative Platform For Green and Intelligent Maintenance Technology on Highway, Ministry of Transport, Xi'an 710075, China;Shenzhen Expressway Co.,Ltd, Shenzhen 518026, China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,公路绿色智能养护技术协同创新平台,西安710075 [2]深圳高速公路集团股份有限公司,深圳518026

出　　处：《科学技术与工程》2022年第19期8486-8493,共8页Science Technology and Engineering

基　　金：陕西省重点研发计划(2019GY-211);中交一公院科技创新基金(KCJJ202017)。

摘　　要：为了探究不中断交通条件下连续箱梁桥拼宽关键技术,依托机荷高速改扩建工程,通过现场桥梁的车桥耦合振动测试,得到某连续箱梁桥的最大振动频率为5.62 Hz,最大振动速度为18 mm/s。考虑现场车流量的随机性,以安全的原则共设置两种车辆振动环境(5 Hz,25 mm/s和10 Hz,50 mm/s),并在实验室中测定了不同龄期抗扰动纤维增强混凝土(fiber reinforced cementitious-composite material 50,FRCM50)的弹性模量和抗拉强度。结合现有的施工工艺和新型接缝材料的特点,提出微差浇筑施工工艺。然后,分别分析了采用一次浇筑、分段浇筑和微差浇筑施工工艺时拼宽连续箱梁的受力特点、接缝时变应力、交通组织模式以及经济性,结果表明微差浇筑工艺具有受力合理、施工机械少、经济性好等优点,可指导实际工程施工,具有良好的应用性。The key technology of continuous box girder bridge widening without interruption of traffic was explored.Based on the reconstruction and expansion project of locomotive-load high-speed,the vehicle-bridge coupling vibration test of the bridge was performed on site.The testing results show that,the maximum vibration frequency of a continuous box girder bridge was 5.62 Hz and the maximum vibration velocity was 18 mm/s.Considering the randomness of traffic flow,two vibration environments(5 Hz,25 mm/s;10 Hz,50 mm/s)were configured according to the safety principle.Besides,the elastic modulus and tensile strength of fiber reinforced cementitious-composite material 50(FRCM50)at different ages were measured in the laboratory.Combined with the existing construction technology and the characteristics of new joint materials,the differential pouring construction technology was proposed.Then,the stress characteristics,joint time-varying stress,traffic organization and economy of wide continuous box girder under three construction technologies(one-time pouring,sectional pouring and differential pouring)were analyzed.The results show that the differential pouring technology has the advantages of reasonable stress,less construction machinery and good economy,which can guide the actual construction and has good application.

关 键 词：桥梁拼宽 不中断交通 场地试验 施工工艺 微差浇筑 

分 类 号：U445[建筑科学—桥梁与隧道工程]