跨度430m铁路钢管混凝土拱桥主拱设计  

Design of Main Arch of Concrete-filled Steel Tube Arch Railway Bridge with Span of 430m

作　　者：陈克坚[1] 陈建峰[1] 张志勇[1] CHEN Kejian;CHEN Jianfeng;ZHANG Zhiyong(China Railway Eryuan Engineering Group Co Ltd,Chengdu Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《中国铁路》2021年第9期46-52,共7页China Railway

摘　　要：依托拉林铁路藏木雅鲁藏布江特大桥,对主跨430 m中承式钢管混凝土拱桥主拱拱圈的拱轴线、矢跨比、拱肋截面、拱肋高度及拱肋倾角进行对比分析,确定主拱主要设计参数,拱轴线采用悬链线,矢跨比为1/3.84,拱肋截面采用全桁式截面。研究提出铁路大跨度拱桥计算拱肋高度的推荐公式,并对场地狭窄V形峡谷区钢管混凝土主拱结构进行简要介绍,钢管桁架节段利用缆索吊机悬臂拼装架设,钢管内灌注自密实无收缩混凝土,单管采用四级接力泵送混凝土。该研究可为类似结构设计提供参考。Based on the Zangmu Yarlung Zangbo River Super Major Bridge of Lhasa-Nyingchi Railway,for a 430 m main span half-through concrete-filled steel tube arch bridge,the arch axis,rise-span ratio,arch rib section,arch rib height and arch rib inclination angle of the main arch ring are compared and analyzed to determine the main design parameters of the main arch.The arch axis is of catenary with a rise-span ratio of 1/3.84,and the arch rib section is of full-truss section.In the study,the recommended formula is proposed for calculating the arch rib height of the railway long-span arch bridges,and the concrete-filled steel tube main arch structure in the narrow V-shaped canyon area of the site is briefly introduced.The steel pipe truss segments are assembled and erected by the cable crane cantilever,and the steel tubes are poured with the self-compaction nonshrinkage concrete,which is pumped in four-stage relay pumping mode for a single pipe.This study may provide references for similar structural designs.

关 键 词：铁路桥梁 中承式钢管混凝土拱桥 拱轴线 矢跨比 拱肋截面 拱肋高度 内倾式拱 

分 类 号：U442[建筑科学—桥梁与隧道工程]