Research on Replacement Design of Anti-collision Guardrail of Old Bridge Spanning Railway
With the continuous renewal of highway and railway industry norms and standards,the anti-collision guardrail of early built highway bridge spanning railway cannot meet the current traffic protection needs,which needs to be reconstructed and upgraded.According to the current norms and standards,the grade of the single-layer anti-collision guardrail of the highway bridge spanning the important existing railway has been increased to not less than HA level.In order to ensure the safety of existing railway,it is necessary to set up a durable protective screen and consider the protection design of form traveler during the construction of anti-collision guardrail.Due to the lower requirements of the design technical standards of the old bridge compared with the existing specifications,it is particularly important to consider the compatibility of the deck slab and the anti-collision guardrail of the existing highway bridge when anti-collision guardrail of the highway bridge spanning railway is designed to replace.Taking the replacement design of anti-collision guardrail of an old bridge spanning the existing railway in Tianjin as an example,the calculation method and principle of the replacement design of anti-collision guardrail after the implementation of the current standards are discussed,which can provide reference for similar railway-related projects.
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