杭州湾跨海铁路大桥总体设计与关键技术研究

Research on the Overall Design and Key Technology of Hangzhou Bay Cross-sea Railway Bridge

研究目的:南通至宁波高速铁路杭州湾跨海大桥将是世界上距离最长、建设标准最高的高速铁路跨海桥梁,建设条件复杂,国内外可借鉴的工程经验少,工程建设面临巨大困难和挑战。基于项目特点,提出超长距离跨海桥梁总体设计思路,研究450 m级大跨度斜拉桥铺设无砟轨道、80 m跨径超长联混凝土连续梁无缝线路及超长距离跨海铁路大桥四电设备集约布置、应急救援、运营维护等典型的关键技术,以期为项目决策提供依据,也可为其他跨海铁路工程建设提供参考。研究结论:(1)选择海盐西通道以桥梁方式跨越杭州湾、修建双线铁路桥梁是合适的;(2)杭州湾跨海大桥3座航道桥宜铺设无砟轨道,全桥不限速;(3)超长距离引桥宜采用80 m跨径超长联混凝土连续梁无缝线路,设置钢轨伸缩调节器;(4)超长距离跨海铁路大桥四电设备宜集约布置,设置海上四电平台和墩顶集成平台;(5)超长距离跨海桥梁宜设置紧急救援站,集中救援与随机救援相结合;(6)超长距离跨海铁路大桥宜根据工务、电务、供电运维需求,合理布置运维通道。

Research purposes: Hangzhou Bay Bridge of the Nantong-Ningbo High-speed Railway will be the world’s longest high-speed railway cross-sea bridge with the highest construction standard. The construction conditions are complex, and there are few engineering experiences available for reference at home and abroad, and the engineering construction will face enormous difficulties and challenges. Based on the characteristics of the project, the overall design idea of ultra-long-distance sea-crossing bridges is proposed, and the typical key technologies such as laying of ballastless tracks for 450 m-class long-span cable-stayed bridges, the seamless line of 80 m-span ultra-long-connected concrete continuous beams, and intensive arrangement of four electric/electronic systems, emergency rescue, operation and maintenance of the ultra-long-distance sea-crossing railway bridges are studied, to provide a basis for project decision-making, and also provide reference for other cross-sea railway projects.Research conclusions:(1) It is appropriate to choose the Haiyan West Passage to cross Hangzhou Bay as a bridge and build a double-track railway bridge.(2) The three waterway bridges of the Hangzhou Bay Sea-Crossing Bridge should be laid with ballastless tracks, and the whole bridge has no speed limit.(3) The ultra-long-distance approach bridge should adopt the 80 m-span ultra-long concrete continuous beam seamless line, and set up the rail expansion regulator.(4) The four electric/electronic systems of the ultra-long-distance cross-sea railway bridge should be arranged intensively, and the offshore four-electrical platform and pier should be arranged.(5) Emergency rescue stations should be set up for ultra-long-distance sea-crossing bridges, and centralized rescue should be combined with random rescue.(6) The ultra-long-distance cross-sea railway bridge should reasonably arrange the operation and maintenance channel according to the needs of public works, electricity, and power supply operation and maintenance.