大跨度钢箱系杆拱桥温差变形的规律与控制技术研究  

Study on The Law and Control Technology of Large Span Steel Box Tied Arch Bridge Temperature Deformation

作　　者：张涛 李东兴 ZHANG Tao LI Dongxing(Hebei Vocational and Technical College Track Transport, Shijiazhuang, Hebei 050091, China Shijiazhuang Zhongtian Construction Supervision Co. Ltd. Shijiazhuang, Hebei 050091, China)

机构地区：[1]河北轨道运输职业技术学院,河北石家庄050091 [2]石家庄中天工程建设监理有限公司,河北石家庄050091

出　　处：《公路工程》2017年第1期66-70,共5页Highway Engineering

基　　金：河北省社会科学发展研究重点课题(201602120102);河北省科技支撑项目(13211213D)

摘　　要：随着我国桥梁建设迅猛发展,对系杆拱桥研究及应用也越来越多。以成都某钢箱系杆拱桥为对象,采用自动测温系统进行大桥主梁温度场的测试,根据钢箱梁顶板、顶板加劲肋、底板、底板加劲肋、腹板等实测温度变化,分析了钢箱梁温差变形对主梁线形控制和墩部温差变形对线形控制的影响,研究表明,由于温差的作用,主梁在横桥向发生的变化非常大,离梁部悬臂端部越近,横桥向变形与竖向挠度变形差值变化值越大,最大值分别为51.2、74.1 mm;钢箱梁两个壁墩间因日照温差,整个结构倾斜于温度较低的一侧。在顺桥的方向,钢箱梁壁墩向阴凉侧偏移距离为34.3 mm,主梁整体偏移约38 mm的距离;在横桥方向,墩顶偏移的距离为67.1 mm,主梁横向偏移约85 mm的距离。最后提出消除温度变形影响误差的控制措施为白天进行吊装定位、钢箱梁安装,晚上进行节点焊接和张拉索力施工等工序,早上进行主梁拱肋偏位、应力、标高等复测。With the rapid development of bridge construction in our country, the research and ap- plication of tied arch bridge is more and more. This paper takes Chengdu steel box tied arch bridge as the object of bridge temperature field testing by automatic temperature measuring system, according to the roof, roof steel box girder stiffener, soleplate and stiffeners,webs of measured temperature, temperature and deformation of steel box girder girder and piers deformation shows that the temperature control of the line- ar control. Analysis, due to temperature effect, the girder in the transverse direction of the bridge changes is very large,from the end of the cantilever beam is near, transverse deformation and vertical deflection difference value is greater, the maximum value was 51.2 mm and 74. 1 mm respectively; the sunshine temperature between two steel box girder for wall piers, the whole structure is inclined to the side low tem- perature. In the direction of the bridge girder to cool wall pier lateral offset distance is 34.3 mm, the whole beam shift about 38 mm distance;in the transverse direction, the pier top offset distance is 67.1 mm,about 85 mm of the distance of lateral displacement of girder. The last day of the installation is pro- posed to eliminate the influence of temperature deformation of steel box girder hoisting and positioning, the control measures of the error, night node welding and cable tension construction processes, the morn- ing girder deviation, arch rib stress, elevation survey.

关 键 词：温差变形 控制技术 大跨度 系杆拱桥 

分 类 号：U448.223[建筑科学—桥梁与隧道工程]