随着经济水平持续高速发展,极大地拉动了地区交通需求快速增长,我国早期建设的部分一级公路出现通行能力不足、交通服务水平下降的情况,亟待升级改造为高速公路。笔者以工程设计实践中遇到的问题为例,把握节约实用的原则,分析“一改高”项目中的技术难点并提出解决方案,希望对同类设计项目有所裨益。 With the sustained rapid economic development, the demand for transportation in the region has greatly stimulated the rapid growth of traffic demand. Some of the first-level highways built in our country have not had enough capacity and traffic services have been reduced. Therefore, it is urgent to upgrade and transform them into expressways. Taking the problems encountered in engineering practice as an example, the author grasps the principle of conservation and practicality, analyzes the technical difficulties in the project of “a higher elevation” and puts forward the solutions, hoping to benefit similar projects.