On the Key Construction Technology of Roadbed Splicing in Expressway Widening Project

China's infrastructure construction is developing rapidly. Among them, in the construction of expressway widening projects, the subgrade splicing construction has become more and more prominent as a traditional construction technology, which attracts people's attention. In order to adapt to social and economic development, keeping pace with the development of the times, improving the technical level of subgrade splicing construction has become an inevitable development, because the level of the technical level directly affects the quality of the entire highway project. Based on this, this paper analyzes the subgrade splicing construction technology in the expressway widening project, studies the key points of the subgrade splicing construction control in the expressway widening project, and hopes to provide a reference for the future construction of the expressway reconstruction and expansion project in China.