山区高速铁路高墩大跨桥梁综合比选  

Comprehensive Comparison and Selection of High-pier and Large-span Bridges for High Speed Railway in Mountainous Area

作　　者：杨申 YANG Shen(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055

出　　处：《铁道标准设计》2020年第S01期128-131,157,共5页Railway Standard Design

摘　　要：山区铁路地形复杂多变,地面高差大,多深沟峡谷,桥梁结构成为首选通过方案。依托于某山区高速铁路项目,选取一处U形、地势起伏较大、墩高30~70 m的典型桥梁工点,分别采用48 m及56 m简支梁桥、(64+64)m T形刚构三种桥式布跨方案,通过上下部结构设计、工程用量、施工方法、经济性能等方面综合比选,最终推荐(64+64)m T形刚构方案。经研究发现,当桥墩墩高大于70 m时,大跨桥梁结构相较于简支梁桥更具竞争力。The terrain of mountain railway is complex and variable with great ground elevation difference and deep valley.Based on a mountain high-speed railway project,this paper selects a typical bridge construction project with U-shaped and undulating terrain and pier height range of 30~70 m.Three bridge span layout schemes of 48 m,56 m simply supported beam bridge and(64+64)m T-shaped rigid frame are proposed and comprehensive comparison and analyses are made from the aspects of upper and lower structure design,engineering quantity,construction method and economic performance.Finally,the(64+64)m T-type rigid frame is recommended.It is concluded that when the pier height is higher than 70 m,large-span bridge structure is more competitive than simple-supported beam bridge.

关 键 词：山区铁路 高速铁路 铁路桥梁 简支梁 T形刚构 高墩大跨 综合比选 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]