公路上跨高速铁路桥梁防护措施方案探讨

Research on Protective Measures for Highway Bridge Crossing High-speed Railway

研究目的:目前,在建和已建的公路上跨铁路的公路桥比较多,随着地方经济发展,拟建和规划的上跨公路桥也在积极准备和报批,同时新建高速铁路不可避免需要下钻既有公路。公路上跨高速铁路桥梁的防护措施直接影响到桥下高速铁路的安全,本文针对新建上跨公路桥和高速铁路下钻既有公路桥的防护措施方案进行了探讨,以确保工程措施安全可靠,可实施性强。研究结论:(1)设计荷载根据实际道路通行情况宜适当提高,防撞等级宜采用最高SS级;(2)防抛网形式可根据公路桥所在位置确定采用封闭或半封闭形式;(3)既有公路桥防撞防抛改造可根据工程实际重新更换,或采用安全可靠、可操作性强的刚架桥方案。

Research purposes： At present, there are many built highway bridge and the bridges under construction to cross the railway. With the development of local economy, there will be more and more highway bridges to cross the railway and at the same time, the new high - speed railway will inevitably under - pass the existing highway. The protective measures for the highway bridge crossing the high speed railway directly affect the high - speed railway safety. This paper discusses the protective measures for the highway bridge to cross the railway and the railway to under - pass the existing the highway bridge for making the measures more safe, more reliable and more operable. Research conclusions：（ 1 ） The design load should be appropriately increased according to the actual road conditions and the highest grade SS of the anti - collision should be adopted. （3） The anti - throwing network of full - closed form or semi - closed form can be determined according to the position of the highway bridge. （ 3 ） The anti - collision and anti -throwing network can be rebuilt according to the real engineering requirement, or the scheme of the more safe, reliable and operable strong rigid frame bridge can be used for the existing highway bridge.