摘要
Abstract
The contradiction between the increasing traffic flow and the limited traffic capacity,as well as the increasing public demand for high-quality traffic service level,require the highway reconstruction and expansion to improve the traffic capacity not only by increasing the lanes,but also by adjusting the horizontal and vertical linetypes to improve the road comfort and quality.In the process of horizontal and vertical alignment adjustment of expressway,how to make efficient and high-quality use of existing roads and bridges is of great significance for saving project construction funds,prolonging the service life of existing lines and implementing the concept of green construction.Taking the reconstruction and expansion of an expressway as a case,this paper introduces a synchronous construction technology of multi-bridge lifting mode under different working conditions.The comprehensive utilization of this technology includes many kinds of lifting methods,such as support cushion stone heightening,cover beam connecting height,broken column connecting height and so on.The realization of multi-span synchronous slope adjustment and lifting of bridges has the advantages of economy and practicality,safety and high efficiency,high control precision and so on.关键词
高速公路/桥梁/改扩建/平纵线型/整体同步/调坡顶升Key words
highway/bridge/reconstruction and expansion/horizontal and vertical linetype/overall synchronization/slope adjustment and lifting分类
交通工程
