摘要
沪通长江大桥主航道桥为(140+462+1 092+462+140)m公铁两用钢桁梁斜拉桥,主航道桥6个桥墩均采用沉井基础,沉井上部为钢筋混凝土结构,下部为钢结构。其中,桥塔墩沉井平面尺寸为86.9m×58.7m,平面布置24个12.8m×12.8m的井孔;边墩及辅助墩沉井平面尺寸为39.2m×26.8m。为解决在巨大水流力下钢沉井的浮运、定位、着床等难题,确保施工质量,桥塔墩钢沉井在工厂整体制造,采取临时封闭12个井孔的助浮措施,整体出坞浮运,并采取了大直径钢管桩锚碇系统及液压千斤顶多向快速定位技术;边、辅墩沉井工厂整体制造,分两大段整体运输、吊装,采取了沉井内部大直径钢管桩定位技术;29号主墩采取河床预防护技术。采取以上关键技术后,主航道桥6个桥墩沉井均已进入稳定深度,实施效果良好。
The main ship channel bridge of the Hutong Changjiang River Bridge is a rail-cumroad steel truss girder cable-stayed bridge with span arrangement（140＋462＋1 092＋462＋140）m.The foundations for the 6piers of the main ship channel bridge are all the open caissons,the upper parts of which are the reinforced concrete structures while the lower parts are the steel structures.Of the caissons,the plan dimensions of the caissons of the pylon piers are 86.9 m×58.7mand in the plan,24 nos.of the well holes in dimensions of 12.8m×12.8mare arranged for each caisson.The plan dimensions of the caissons of the side and auxiliary piers are 39.2m×26.8m.To resolve the problems of the floating,positioning and landing of the steel caissons onto the riverbed under the tremendous current forces and to ensure the construction quality,the steel caissons of the pylon piers were integrally manufactured in the workshop,integrally floated out from the shipyard by the floating aid measure of temporarily closing the 12 well holes in a caisson and the caissons were rapidly positioned in multiple directions,using the technique of the large diameter steel pipe pile anchorage system and hydraulic jacks.The caissons of the side and auxiliary piers were also integrally manufactured in the workshop,were integrally transported,lifted and installed in each two lifts of a caisson and were positioned,using the technique of the large diameter steel pipe piles inside the caissons.At the main pier No.29,the technique of the riverbed preprotection was applied.With all these key techniques as mentioned,the open caissons of the 6piers of the main ship channel bridge have all reached their stable depth and the construction effect is sound.
出处
《桥梁建设》
EI
CSCD
北大核心
2015年第6期12-17,共6页
Bridge Construction
基金
中国铁路总公司科技研究开发计划(2014G004-B)~~
关键词
公路铁路两用桥
斜拉桥
钢沉井
整体制造
锚碇
定位
河床防护
桥梁施工
rail-cum-road bridge
cable-stayed bridge
steel open caisson
integrally manu-facturing
anchorage
positioning
riverbed protection
bridge construction
