五通岷江大桥钢梁架设及关键技术-钢结构.PDF

施工技术 五通岷江大桥钢梁架设及关键技术 张建金 ( ， 肥 230022) 中铁四局集团钢结构有限公司 合 : ， (140 + 224 + 140)m ， N 摘 要 五通岷江特大桥主桥为下弦变桁高双主桁连续钢桁梁桥 跨径布置为 主桁采用 型 K 。 ， 、 、 。 和 型组合桁式 钢梁采用下弦变桁高桁式 结构体系新 技术标准高 架设难度大 采用从两边跨向主跨对称悬 、 。 、 。 臂拼装 跨中合龙技术 边跨钢梁在临时墩上采用半悬臂拼装架设 主跨钢梁采用悬臂架设施工 系统介绍钢梁 架设关键技术及主要创新点。 : ; ; 关键词 钢桁梁 架设 关键技术 DOI :10. 13206 /j． gjg201609022 THE EＲECTION OF STEEL TＲUSS GIＲDEＲ OF WUTONG MINJIANG BＲIDGE AND ITS KEY TECHNIQUES Zhang Jianjin (Steel Structure Engineering Co． Ltd of CTCE Group ，Hefei 230022 ，China) ABSTＲACT :The design of variable cross section and double main truss continual steel trusses bridge were applied to Wutong Minjiang Extra-Large Bridge． With its span arrangement (140 + 224 + 140)m ，the combination of N-shape and K- shape bottom chords with variable truss height and truss type for the main truss were used． When the bottom chord with variable truss height and truss type was applied to the steel beam ，the structure system was original ，the technique standard was high ，and the erection was very difficult． The technique of symmetrical cantilever assembling for the main span from both sides ，and gathering up in the process of assembling was applied． The half-cantilever erection was used in the temporary pier for the side span steel beam and the construction of the cantilever erection was used for the main span steel beam． This paper introduced the key techniques and main innovative points for steel beam erection． KEY