Research On Key Technologies Of The Design And Construction About Temporary Road-bridge System In Cover-excavation Metro

The construction of rail transit is one of the important means to ease urban traffic congestion. And the main purpose to use cover-excavation method to construct subway station in a city is to minimize the impact of urban transportation and environment caused by subway station construction, so achieve the urban infrastructure construction and environment friendly and harmonious. Thus the key of cover-excavation method is the success of design, construction and maintenance of temporary road-bridge system, because if there is any problem will seriously bring about a series of problems. Then it is necessary to suspend construction, and do not have enough space for another conversion, which result to the temporary road bridge system restoration difficult, and urban traffic will appear obstruction.Temporary road-bridge system includes the temporary road surface system and the vertical support system. because there is no design code about the calculation of temporary road-bridge system, while the use of temporary road-bridge department of time is often longer, so in the construction process of the entire station foundation, how to ensure that temporary road-bridge system are be used safely is an important issue for cover-excavation construction needs to resolve. To this end, this paper apply temporary road-bridge system of Tiexi station, through theoretical analysis and numerical simulation method to analysis the design method of temporary road surface system and temporary road -bridge structural system, the parameters of military beam, the interaction of fender post and temporary road-bridge system. Then the detailed calculation of the theoretical principles and the corresponding design parameters of a temporary road-bridge system are given.