摘要
平潭海峡公铁大桥处于典型的大风海洋环境,其FPZQ-3标段的3座通航孔桥均为双塔双索面钢桁-混凝土混合梁斜拉桥,均采用H形钢筋混凝土桥塔,桥塔墩承台采用哑铃形防撞吊箱围堰施工。围堰采用"永-临"结合的原则设计,施工后将围堰作为防撞箱使用。围堰采用工厂化制造,整体拼装后利用滑道将其滑移出厂,减少了现场作业时间;围堰分2次吊装,利用千斤顶精准就位技术,保证了围堰在恶劣海况下的精准对接施工;采用三层限位、斜撑和消波孔技术,克服了波浪对围堰施工的影响;系梁区采用系梁桁架,解决了系梁区的抗浮和抗沉问题;采用底板、侧板可拆卸技术,满足了后期防撞箱侧板更换要求;采用密封胶等防渗措施,保证了围堰的止水效果。
The Pingtan Straits Rail-cum-Road Bridge is a typical sea-crossing bridge exposed to harsh winds.The 3 navigable bridges in Contract FPZQ-3 of the project are all steel truss-concrete hybrid girder cable-stayed bridges,each with two pylons and double cable planes.The pylons are all H-shaped reinforced concrete pylons.The pile cap of each pylon pier is constructed with the aid of the dumbbell-shaped anti-collision box cofferdam.The cofferdam consists of both permanent and temporary components,after the completion of the pile cap construction,which can be used as the box to prevent ship collision.The cofferdam is manufactured in a workshop and slipped out of the workshop by sliding rails after being integrally assembled,so as to cut down the time used for in-situ operation.The cofferdam is hoisted twice and lowered accurately into position by jacks to realize the precise connection of cofferdam lifts in the harsh sea environment.Three layers of restraints,inclined struts and wave absorbing holes are added to overcome the effects of waves on the cofferdam construction.In the tie beam zone,trusses are used to resolve the problems of buoyancy and sinking.The bottom and wall plates are all detachable for the future replacement.The cofferdam is sealed by sealant to assure its waterproof effect.
引文
[1]张立超.平潭海峡公铁两用大桥通航孔桥桥塔墩承台施工技术[J].桥梁建设,2017,47(6):1-6.(ZHANG Li-chao.Construction Techniques for Pile Caps of Pylon Pier of Navigable Span Bridges of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2017,47(6):1-6.in Chinese)
[2]陈翔,梅新咏.平潭海峡公铁两用大桥主航道斜拉桥深水基础设计[J].桥梁建设,2016,46(3):86-91.(CHEN Xiang,MEI Xin-yong.Design of Deepwater Foundations of Main Ship Channel Cable-Stayed Bridge of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2016,46(3):86-91.in Chinese)
[3]马晓东.平潭海峡公铁两用大桥总体施工方案[J].桥梁建设,2017,47(2):1-6.(MA Xiao-dong. General Construction Scheme of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2017,47(2):1-6.in Chinese)
[4]王东辉.平潭海峡公铁两用大桥非通航孔引桥围堰设计与施工[J].桥梁建设,2016,46(3):1-5.(WANG Dong-hui.Design and Construction of Cofferdam for Non-Navigable Span Approach Bridge of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2016,46(3):1-5.in Chinese)
[5]吕奖国,朱瑞允,吴义龙,等.马鞍山长江公路大桥钢围堰精确定位与渡洪技术[J].桥梁建设,2014,44(4):9-14.(LU Jiang-guo,ZHU Rui-yun,WU Yi-long,et al.Techniques of Accurate Position and Safety of Steel Cofferdam for Maanshan Changjiang River Highway Bridge in Flood Season[J]. Bridge Construction,2014,44(4):9-14.in Chinese)
[6]孙英杰,梅新咏.平潭海峡公铁两用大桥鼓屿门航道桥主墩基础设计[J].世界桥梁,2016,44(1):15-19.(SUN Ying-jie,MEI Xin-yong.Design of Main Foundation for Guyumen Channel Bridge of Pingtan Straits Rail-cum-Road Bridge[J]. World Bridges,2016,44(1):15-19.in Chinese)
[7]肖世波.平潭海峡公铁两用大桥防撞吊箱围堰施工关键技术[J].中国高新科技,2018(10):55-60.(XIAO Shi-bo.Key Techniques for Constructing of Anti-Collision Steel Boxed Cofferdams of Pingtan Straits Rail-cum-Road Bridge[J].China High-Tech,2018(10):55-60.in Chinese)
[8]刘成钢,茹启江,陈琳,等.海域深水区高桩承台钢吊箱围堰施工技术[J].建筑技术,2016,47(6):533-536.(LIU Cheng-gang,RU Qi-jiang,CHEN Lin,et al.Construction Technology Application of Steel Boxed Cofferdam on High-Rise Pile Cap in Deep Ocean Area[J].Architecture Technology,2016,47(6):533-536.in Chinese)
[9]杨博,严伟飞,张海霞.鳌江特大桥主墩钢吊箱施工技术[J].公路交通科技(应用技术版),2017,13(8):255-258.(YANG Bo,YAN Wei-fei,ZHANG Hai-xia.Construction Techniques of Steel Suspension Box in Main Pier of Aojiang River Bridge[J].Journal of Highway and Transportation Research and Development(Applied Technology Edition),2017,13(8):255-258.in Chinese)
[10]黄博,段伦良,祝兵.三维波浪作用下钢吊箱围堰下放过程受力研究[J].西南交通大学学报,2018,53(3):525-532.(HUANG Bo,DUAN Lun-liang,ZHU Bing.Study of Three-Dimensional Wave Forces on Lowering of Steel-Suspending Cofferdam[J].Journal of Southwest Jiaotong University,2018,53(3):525-532.in Chinese)