摘要
重庆市新九中路项目主线桥第五联为连续钢箱梁桥,跨径为(40+49+40)m,分为左右两幅,钢箱梁总重1535.8t。钢箱梁桥采用单箱单室等截面形式,顶板宽9m,底板宽5m,梁高2m,钢箱梁顶板厚20mm,底板厚24mm,腹板厚24mm,每幅划分为19个钢箱梁节段。由于新九中路主线桥第五联下穿重庆市轨道交通二号线,垂直相交,上跨快速路陈庹路高架桥段,垂直相交,上跨九中立交转盘既有交通线路,故设计为钢箱梁,采用钢箱梁顶推施工工艺。顶推施工中,设置了拼装临时支墩、顶推临时支墩、钢导梁等临时结构;利用650t智能步履式顶推设备进行多点同步连续顶推技术;运用了钢箱梁顶推技术、钢箱梁人字坡调整技术,完成了该桥钢箱梁顶推施工。结果表明,顶推过程稳定,钢箱梁及导梁结构强度满足规范要求。
The fifth connection of the main line bridge of New JiuZhong Road in Chongqing is a continuous steel box girder bridge with a span diameter of(40+49+40)m,which is divided into left and right frames with a total weight of 1535.8t.The steel box girder bridge adopts a single-box single-chamber cross-section form,with a roof width of 9m,a bottom plate width of 5m,a beam height of 2m,a steel box girder roof thickness of 20mm,a bottom plate thickness of 24mm,and a web plate thickness of 24mm.Each frame is divided into 19 steel box girder sections.Because the fifth connection of the main line bridge of New Jiuzhong Road crosses the second line of Chongqing Rail Transit,it intersects vertically.It crosses the viaduct section of Chen Tuo Road on the expressway and intersects vertically.There are existing traffic lines on the upper nine neutral intersections.Therefore,it is designed as a steel box girder and adopts the construction technology of steel box girder top push.In the jacking construction,temporary structures such as assembly temporary piers,jacking temporary piers,steel guide beams,etc.are set up;multi-point synchronous continuous jacking technology is carried out using 650t intelligent stepping equipment;steel box girder jacking technology and steel box girder herringbone slope adjustment technology are used to complete the bridge steel box girder jacking construction.The results show that the push process is stable,and the structural strength of the steel box girder and guide beam meets the requirements of the specification.
作者
熊斌
虞志钢
马明
陈宇波
葛玉强
秦宗琛
XIONG Bin;YU Zhigang;MA Ming;CHEN Yubo;GE Yuqiang;QIN Zongchen(China Construction Fifth Engineering Bureau Limited,Changsha 410007,China;China Construction Tunnel Co.,Ltd.,Chongqing 401320,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期3138-3141,共4页
Building Structure
基金
中国建筑第五工程局有限公司科技研发课题(cscec5b-2020-16)
中建隧道科技研发课题(cscec5b-SUI-2021-10)
关键词
跨线桥
钢箱梁
步履式顶推
顶推施工
bridge across the existing line
steel box girder
walking-type jacking and pushing
incremental launching method monstruction
作者简介
第一作者:熊斌,硕士,工程师,Email:314706116@qq.com。
