混凝土U型渠被广泛应用到小型渠道输水和灌溉节水中，但U型渠的混凝土衬砌施工质量饱受诟病，其原因是混凝土U型渠施工技术要点没被重视或掌握，没有合适可行的施工机械。本文从U型渠的施工准备着手，分析土方渠道碾压、U断面开挖、混凝土现浇衬砌等施工环节对工程质量的影响；详细介绍了混凝土U型渠施工机械--U型渠土方掘进衬砌一体机的工作原理和施工技术要点，并用实测资料对比和分析了传统施工方法影响U型渠道混凝土工程质量的原因。

U-shape concrete channel is widely applied as field canal to water delivery and water-saving irrigation. However, the bad quality of U-shape concrete channel’s lining construction is diffusely savaged too. The reason goes to that the key points of U-shape concrete channel construction technical are not valued or mastered. Besides, there is no suitable or feasible construction machinery. Therefore, starts from the construction preparation of U-shape channel, this paper analyses the impact of construction procedures such as earthwork channel roller compaction, U-shape section excavation, cast-in-place concrete lining construction to the quality of project; introduces the working principle and key points of the excavating-and-lining machine for U-shape concrete channel; contrasts and analyses the impact of different construction methods for U-shaped concrete channel’s quality with measured data.