太原迎宾桥钢塔牵引竖向转体施工关键技术
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摘要
太原迎宾桥主桥为(86+93+155+86)m自锚式悬索桥,钢箱式桥塔全长114m,立面倾斜22.8°,重约1 200t,采用"卧式拼装、竖向转体"的牵引竖向转体法施工。转体系统由主转铰、临时风撑、拉压杆、牵引系统、后锚系统等组成,主转铰设置在塔梁固结段与相邻钢塔节段接头位置,刚性临时风撑通过铰轴与主转铰同心旋转,拉压杆与钢塔组成稳定三角体系,由计算机同步系统控制牵引索完成桥塔竖向转体。桥塔转体过程中,采取工具轴和精密测量技术,实现主转铰与风撑较轴"四铰共转";试转体通过后,在风力小于4级的清晨开始正式转体,在12h以内实现竖转67.2°。对钢塔、拉压杆、铰座及锚座实时监控,结果表明结构受力和竖转机构运行均满足要求。
The main bridge of the Yingbin Bridge in Taiyuan is a self-anchored suspension bridge with spans of 86,93,155 and 86 m.The steel box pylon rises to a full height of 114 m,inclines at an angle of 22.8°,and weighs about 1 200 t.The pylon was constructed by hauling and vertical rotating method,by which the pylon sections were assembled in lying position and vertically rotated.The rotating system consisted of main rotating hinges,temporary wind bracings,tensile and compressive rods,hauling system and the post anchoring system.The main rotating hinges were installed at the locations where the pylon-girder fixed section and the adjacent pylon sections converge.The rigid temporary wind bracings rotated with the main rotating hinges circling the same center.The tensile and compressive rods and the steel pylon formed a stable triangular system.The hauling cables were controlled by the synchronized system to carry out the vertical rotation of the pylon.During the rotating process of the pylon,the synchronized rotation of four hinges(two main hinges and two hinges in the wind bracings)was realized using tool axles and precise measuring technique.After the success of the trial rotation,the formal rotation was carried out in a morning when the wind force was lower than 4 on the Beaufort scale.It took less than 12 hours to complete a rotation of 67.2°.The steel pylon,tensile and compressive rods,hinge pedestals and anchorages were monitored in real time.The results show that the mechanical performance of the structure and the vertical rotating system can meet the requirements.
The main bridge of the Yingbin Bridge in Taiyuan is a self-anchored suspension bridge with spans of 86,93,155 and 86 m.The steel box pylon rises to a full height of 114 m,inclines at an angle of 22.8°,and weighs about 1 200 t.The pylon was constructed by hauling and vertical rotating method,by which the pylon sections were assembled in lying position and vertically rotated.The rotating system consisted of main rotating hinges,temporary wind bracings,tensile and compressive rods,hauling system and the post anchoring system.The main rotating hinges were installed at the locations where the pylon-girder fixed section and the adjacent pylon sections converge.The rigid temporary wind bracings rotated with the main rotating hinges circling the same center.The tensile and compressive rods and the steel pylon formed a stable triangular system.The hauling cables were controlled by the synchronized system to carry out the vertical rotation of the pylon.During the rotating process of the pylon,the synchronized rotation of four hinges(two main hinges and two hinges in the wind bracings)was realized using tool axles and precise measuring technique.After the success of the trial rotation,the formal rotation was carried out in a morning when the wind force was lower than 4 on the Beaufort scale.It took less than 12 hours to complete a rotation of 67.2°.The steel pylon,tensile and compressive rods,hinge pedestals and anchorages were monitored in real time.The results show that the mechanical performance of the structure and the vertical rotating system can meet the requirements.
引文
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[3]卫军,曾志豪,李定有.斜拉桥异型拱塔施工临时横撑方案比选[J].桥梁建设,2017,47(4):113-118.
[4]王杰,徐启利.平潭海峡公铁两用大桥元洪航道桥桥塔桁架式临时横撑设计[J].世界桥梁,2018,46(4):22-26.
[5]孙九春.竖转提升工艺下拱肋体系转换与合龙控制方法研究[J].桥梁建设,2017,47(1):53-58.
[6]聂磊,谢国平.公路跨铁路桥梁转体施工设计[J].铁道勘察,2018(3):117-121.
[7]曾甲华,刘智春,陈裕民,等.转体施工钢箱梁独塔斜拉桥设计[J].世界桥梁,2016,44(4):11-15.
[8]高光品,何乔东.京张高铁土木特大桥连续梁墩顶转体施工技术[J].桥梁建设,2018,48(6):1-5.
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