山区高墩桥梁上部结构选型讨论  

Discussion on Selection of Superstructure for High Pier Bridges in Mountainous Areas

作　　者：许延祺 赵洁 XU Yanqi;ZHAO Jie(TPRI(Beijing)Engineering Consulting Co.,Ltd.,Beijing 100028)

机构地区：[1]交规院(北京)工程咨询有限公司,北京100028

出　　处：《公路交通技术》2025年第1期110-117,共8页Technology of Highway and Transport

摘　　要：山区高速公路桥隧比高,地形地质复杂,跨越河谷和深沟时会出现很多高墩桥梁,当墩高介于50 m~70 m时,需对桥梁上部结构进行综合比选,择优选择合理的结构形式。以长沙至吉首高速公路(长沙段)为工程背景,以40 m预制T梁、50 m钢板组合梁以及悬浇刚构桥作为比选对象,综合考虑地形地质、结构受力、施工方案等因素,重点从经济性层面研究了低烈度区、覆盖层厚度不大的情况下,桥梁结构的合理选型。结果表明:墩高50 m~70 m时,预制T梁经济性最好,但随墩高的增加,其经济性降低;对工期控制性工程建议采用50 m钢板组合梁;当跨越V形或U形山谷或河谷时,建议采用悬浇刚构桥跨越沟底,以减少下部结构的数量及高度。The mountainous expressway has the characteristics of high bridge tunnel ratio,complex terrain and geology,and many high pier bridges will appear when crossing river valleys and deep ditches.When the pier height is between 50m and 70 m,it is necessary to conduct a comprehensive comparison of the upper structure of the bridge and select the optimal structural form.This paper takes the Changsha to Jishou expressway(Changsha section)as the engineering background,and takes 40 m prefabricated T-beams,50 m steel plate composite beams,and suspended rigid frame bridges as the comparison objects.Taking into account factors such as geological terrain,structural stress,and construction plans,the paper focuses on studying the reasonable selection of bridge structures in low intensity areas with small coverage layer thickness from an economic perspective.The results show that prefabricated T-beams have the best economic efficiency when the pier height is between 50 m and 70 m,but as the pier height increases,the economic advantage becomes smaller and smaller.It is recommended to use 50 m steel plate composite beams for construction period control projects.When crossing V-shaped or U-shaped valleys or valleys,it is recommended to use a suspended rigid frame bridge to cross the bottom of the ditch,in order to reduce the number and height of the lower structure.

关 键 词：高墩 经济性 上部结构 结构选型 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]