改扩建项目在新一轮的公路建设中已越来越普遍,精细化设计对改扩建项目节省工程造价具有重要意义。该文依托224省道昆山北段改扩建项目,阐述精细化设计理念在实际项目设计中的应用,并抛砖引玉,为改扩建项目的设计提供实际案例。 Reconstruction and expansion project in the new round of highway construction has become more and more common, fine design of renovation and expansion project to save construction cost is of great significance. Based on the reconstruction and expansion project of the north section of Kunshan in section 224, this article elaborates the application of the concept of refinement design in the actual project design and gives some suggestions to the design of the reconstruction and expansion project.