高速公路改扩建中净空受限的跨线桥改造研究

STUDY ON THE RECONSTRUCTION OF OVERPASS BRIDGE WITH LIMITED CLEARANCE IN EXPRESSWAY RECONSTRUCTION AND EXPANSION

跨线桥的还建设计是高速公路改扩建设计中的重要组成部分,由于历史遗留问题,其会存在桥位限定、桥下净空受限的特殊还建跨线桥工点,这是高速公路改扩建设计中的难点之一。研究以2022年扩容建成通车的G0512线成都至乐山高速公路中一座桥位固定、桥下净空受限的特殊还建跨线桥为工程实例,研究论述了还建跨线桥的设计过程,以期为类似工程提供借鉴。

The reconstruction plan of overpass bridge is an important component of expressway reconstruction and expansion design.Due to the problem of historical omission,there will be special construction work points of overpass bridge with limited bridge location and limited clearance under bridge,which is one of the difficulties in expressway reconstruction and expansion design.Taking a special reconstructed bridge with fixed bridge position and limited clearance under the G0512 Chengdu-Leshan expressway,which will be expanded and opened to traffic in 2022,as an example,this study discusses the design process of the reconstructed bridge in detail,in order to provide reference for similar projects.