| At present, earlier freeway is under reconstruction and expansion in China, to adapt to the needs of the development of the social economy. Interchange is the transportation conversion node, its expansion is an important component of the highway reconstruction project. Expansion of interchange involves environment, natural, land use and cost, etc. Therefore, the study for interchange reconstruction program is very necessary.People put forward higher request for the construction of interchange along with the experience gradually accumulate of interchange construction and deepening understand of interchange. Especially in the reconstruction and expansion should actively implement the new concept, achieve "people-oriented, safety first."This paper summarizes the design principle and influence factors of reconstruction program, emphasis on summary of interchange reconstruction program, and puts forward some practical suggestions. For the particularity of alignment design requirements of expansion, the on-board Light Detection and Ranging technique is raised. Based on the analysis of the reconstruction design standards, this paper works out mainline design standards within the interchange scope, the design essentials of horizontal, longitudinal alignment and overpass bridge, explores ramp flat, longitudinal surface alignment design and ramp ends design respectively, and puts forward corresponding design essentials. Interchange expansion construction work should on the basis of "safety, unblocked, easy to operate". Through the analysis of traffic characteristics of drivers, construction zone, vehicles of interchange reconstruction section, summarizes the reconstruction principle and program of traffic organization, works out the safety countermeasures during expansion operations. General principles and methods of flared interchange expansion are briefly explained, combined with actual interchange reconstruction project, so as to provide a theoretical basis to interchange expansion project. |
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