南京长江五桥钢壳混凝土桥塔足尺模型工艺试验
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摘要
南京长江五桥主桥为主跨600m的中央双索面三塔组合梁斜拉桥,桥塔采用内外钢壳-混凝土组合结构,采用工厂内分节段制造拼装、桥位现场整节段吊装并浇筑混凝土的施工工艺。为验证施工工艺的可行性与适应性,开展桥塔足尺模型工艺试验,重点进行钢壳吊装定位、钢筋现场连接、钢壳节段间环缝焊接和混凝土浇筑工序,并测试混凝土的工作性能及温度、应变变化规律。结果表明:钢壳节段制造及桥位施工所采用的工艺方案总体可行;钢壳节段现场吊装及混凝土浇筑等作业基本反映实际情况;混凝土温度仿真计算结果与实测值相吻合,能够指导实际施工;混凝土内部变形基本均匀。
The main bridge of Fifth Changjiang River Bridge in Nanjing is a cable-stayed bridge with a main span of 600 m,which possesses a composite girder,central double cable planes,and three pylons.The internal and external steel shell-concrete composite structures are adopted for the pylon.In the construction process of the pylon,segments are manufactured and assembled in the factory,the entire section of the pylon is hoisted in situ,and the fresh concrete is poured.In order to verify the feasibility and adaptability of the construction process,we performed the process tests of the full-scale model of pylon,focusing on the steel shell hoisting and positioning,on-site connection of steel bar,circumferential seam welding of steel shell segments,and concrete pouring;moreover,we tested the work performance of concrete,and analyzed the variation law of temperature and strain.The results show that the technological scheme for the manufacture of steel shell segments and the construction of bridge position is feasible;the on-site lifting of steel shell segments and concrete pouring basically reflect the actual situation;the simulation calculation results of temperature are consistent with the measured values,which can be adopted to guide the actual construction;the internal deformation of the concrete is basically uniform.
The main bridge of Fifth Changjiang River Bridge in Nanjing is a cable-stayed bridge with a main span of 600 m,which possesses a composite girder,central double cable planes,and three pylons.The internal and external steel shell-concrete composite structures are adopted for the pylon.In the construction process of the pylon,segments are manufactured and assembled in the factory,the entire section of the pylon is hoisted in situ,and the fresh concrete is poured.In order to verify the feasibility and adaptability of the construction process,we performed the process tests of the full-scale model of pylon,focusing on the steel shell hoisting and positioning,on-site connection of steel bar,circumferential seam welding of steel shell segments,and concrete pouring;moreover,we tested the work performance of concrete,and analyzed the variation law of temperature and strain.The results show that the technological scheme for the manufacture of steel shell segments and the construction of bridge position is feasible;the on-site lifting of steel shell segments and concrete pouring basically reflect the actual situation;the simulation calculation results of temperature are consistent with the measured values,which can be adopted to guide the actual construction;the internal deformation of the concrete is basically uniform.
引文
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[10]张鸿,田唯,王敏,等.大跨径斜拉桥组合梁节段匹配制造足尺模型试验[J].桥梁建设,2014,44(3):75-80.(ZHANG Hong,TIAN Wei,WANG Min,et al.Full-Scale Model Tests for Matching Fabrication of Composite Girder Blocks of Long Span Cable-Stayed Bridge[J].Bridge Construction,2014,44(3):75-80.in Chinese)
[2]中交二航局南京长江第五大桥A1标项目经理部.主桥索塔足尺模型试验总结[Z].南京:2018.(The Fifth Nanjing Changjiang River Bridge Engineering A1 Standard Project Manager of CCCC Second Harbor Engineering Co.,Ltd.Summary of Full-Scale Model Test of the Main Bridge Pylon[Z].Nanjing:2018.in Chinese)
[3]许颖强.太原摄乐大桥异型钢-混混合塔柱施工技术[J].桥梁建设,2018,48(2):99-104.(XU Ying-qiang.Construction Techniques for SpecialShape Steel and Concrete Hybrid Pylon Columns of Shele Bridge in Taiyuan[J].Bridge Construction,2018,48(2):99-104.in Chinese)
[4]唐勇,张瑞霞.马鞍山钢-混叠合塔施工技术研究[J].铁道工程学报,2011(11):77-81.(TANG Yong,ZHANG Rui-xia.Research on Construction Technology of Steel-Concrete Coincided Tower of Maanshan Bridge[J].Journal of Railway Engineering Society,2011(11):77-81.in Chinese)
[5]易云焜.曲线形独塔无背索斜拉桥施工控制关键技术[J].桥梁建设,2018,48(2):116-120.(YI Yun-kun.Key Techniques for Construction Control of a Curved Single Pylon Cable-Stayed Bridge Without Backstays[J].Bridge Construction,2018,48(2):116-120.in Chinese)
[6]朱伯芳.大体积混凝土温度应力与温度控制[M].北京:清华大学出版社,2014.(ZHU Bo-fang.Thermal Stresses and Temperature Control of Mass Concrete[M].Beijing:Tsinghua University Press,2014.in Chinese)
[7]张鸿,郑和晖,陈鸣.波形钢腹板组合箱梁桥节段预制拼装工艺试验[J].桥梁建设,2017,47(1):82-87.(ZHANG Hong,ZHENG He-hui,CHEN Ming.Tests of Segmental Precasting and Assembling Technology for Composite Box Girder Bridge with Corrugated Steel Webs[J].Bridge Construction,2017,47(1):82-87.in Chinese)
[8]张光辉,张启伟,刘玉擎,等.斜拉桥混合塔结合部受力机理模型试验[J].哈尔滨工业大学学报,2017,49(3):106-112.(ZHANG Guang-hui,ZHANG Qi-wei,LIU Yu-qing,et al.Model Test of Composite Joint for Tower of Cable-Stayed Bridge[J].Journal of Harbin Institute of Technology,2017,49(3):106-112.in Chinese)
[9]杨炎华,齐云慧.组合梁斜拉桥整体节段悬臂拼装足尺模型试验[J].桥梁建设,2014,44(4):40-44.(YANG Yan-hua,QI Yun-hui.Full-Scale Model Tests for Cantilever Installation of Integral Blocks of Composite Girder Cable-Stayed Bridge[J].Bridge Construction,2014,44(4):40-44.in Chinese)
[10]张鸿,田唯,王敏,等.大跨径斜拉桥组合梁节段匹配制造足尺模型试验[J].桥梁建设,2014,44(3):75-80.(ZHANG Hong,TIAN Wei,WANG Min,et al.Full-Scale Model Tests for Matching Fabrication of Composite Girder Blocks of Long Span Cable-Stayed Bridge[J].Bridge Construction,2014,44(3):75-80.in Chinese)