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受路网改造形成的新布局以及新交通量的发展等因素的影响,已经建成的许多互通式立交面临改造。该文结合工程实践,简要介绍大同市南出口西河河互通改扩建的方案设计思路,最终采用的方案既满足交通量发展的需求,也尽可能利用已建工程,减少工程浪费,节约工程造价。文中从方案型式选择、改扩建方式以及工程经济、实施难度等方面对互通式立交改扩建做一探讨。
Due to the new layout resulting from the road network reform and the development of new traffic, many intercontinental interchanges already under construction are undergoing transformation. Based on the engineering practice, this paper briefly introduces the scheme design of Xihe interchange in Datong City. The final scheme not only meets the demand of traffic development, but also makes use of the built projects as much as possible to reduce the project waste and save the project cost. In the paper, the paper discusses the reform and expansion of the interchange between the types of schemes, the ways of reconstruction and extension, the engineering economy and the difficulty of implementation.