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随着交通量不断增长和路网布局的逐年更新,高速公路改扩建项目日益增多,互通立交布设成了改扩建工程的重点和难点,而多肢枢纽互通立交方案在国内高速公路改扩建工程中尚不多见,现有设计规范对此也较少涉及。笔者以南宁外环高速公路安吉枢纽互通立交改扩建项目为例,介绍了多肢枢纽互通立交用于改扩建工程的必要性以及设计中采取的技术思路,在分析设计中遇到的主要问题的基础上,总结提出相应设计原则并给出具体方案,可供类似工程参考。
With the continuous growth of traffic volume and the yearly updating of road network layout, the number of expressway reconstruction and expansion projects is increasing day by day. Interchanges have become the focus and difficulty of the expansion and expansion project. However, Not yet seen, the existing design code is also less involved. Taking Nanning Outer Ring Expressway Anji Interchange Project as an example, the author introduces the necessity of interoperability interchange of multi-limbs interchange project and the technical ideas adopted in the design, and analyzes the main problems encountered in the design Based on the conclusion of the corresponding design principles and give specific programs for similar projects for reference.