宁马市域（郊）铁路（南京段）高架区间总体设计

Overall Design of Elevated Sections in Nanjing-Maanshan Urban (Suburban) Railway (Nanjing Section)

摘要:

市域（郊）铁路高架区间边界条件复杂、控制因素多，合理的总体设计方案至关重要。依托宁马市域（郊）铁路（南京段）项目，对高架区间桥梁结构体系、梁型、标准跨径、墩型及施工工法进行了研究。结合项目特点，区间标准跨桥梁采用35 m跨单箱单室简支箱梁、支架现浇施工，桥墩一般采用花瓶墩。简支箱梁预应力钢束采用梁端张拉，每片梁梁端设置后浇带，相邻梁体可同步施工，节省工期。跨越河流或路口采用连续梁或系杆拱桥，其中跨越G205国道桥采用1-144.2 m简支系杆拱桥，尼尔森体系，为国内城市轨道交通及市域（郊）铁路同类桥型跨度之最，可供类似工程参考借鉴。

Abstract:

The boundary conditions of elevated sections in the urban (suburban) railways are complex with multiple control factors. The rational overall design scheme is crucial. Relying on the Nanjing-Maanshan Urban (Suburban) Railway (Nanjing Section) Project, the structural systems, beam types, standard spans, pier types and construction methods for the elevated sections of the bridge are studied. Combined with the project characteristics, the standard bridge span of the elevated sections is the 35-m span single-box single-cell single-box simple-supported box beam constructed by cast-in-place method with supports. The bridge pier is a vase-shaped pier. The prestressed steel tendons of the simple-supported box beam is tensioned at the beam end. The end of each beam segment is equipped with a post-cast strip. The adjacent beams can be simultaneously constructed, which saves the construction time. The continuous beams or bowstring arch bridges are used to span the rivers or intersections, in which the bridge spanning the National Highway G205 is a 1-144.2 m simple-supported bowstring arch bridge, following Nielsen system. The bridge has the largest span of similar bridge types in domestic urban rail transit and urban (suburban) railways, and can be used as a reference for similar projects.