大兴机场线共构结构总体设计研究

摘要:

轨道交通大兴机场线高架区间长16.2km,其中7.9km为路-轨共构结构。共构结构体系为四层立体布置,最上层为大兴机场高速公路,中间层为大兴国际机场线,地面层为团河路,布置于桥墩外侧,两桥墩承台基础之间,地面以下设置综合管廊。根据高速公路设计要求、出入共构段线路布置以及立交匝道布置的需要,共构结构桥墩分为两墩柱、三墩柱和四墩柱三种形式。共构结构体系可以节约土地,提高土地综合利用率。本文结合大兴机场线共构段设计,介绍了共构结构体系的确定,共构断面的确定,设计规范选取,共构结构桥墩(双墩柱和四墩柱)形式研究。

Abstract:

The length of Daxing airport elevated line is 16.2km, of which the length of road-rail co-structure is 7.9km. The road-rail co-structure system is arranged in four layers, the top layer is Daxing Airport Expressway, the middle layer is Daxing airport line, and the ground layer is Tuanhe Road, which is arranged outside the pier. The utility tunnel is arranged under the ground and between the foundation of two pier caps. There are three pier types, namely, two pier, three pier and four pier. The application of CO structure system could save land and improve the comprehensive utilization. The road-rail co-structure system, cross-section of co- structure , design code and structure research of the different piers are introduced in this paper.