1前言砼管道用于农业低压输水灌溉，由于其耐久性好和易成型各种口径的特点，深受广大农民朋友的欢迎。通常，这些砼管道大都是采用集中预制的方法，检验合格后，再运送到施工现场。由于受到应用成本的限制，管壁无加筋，为素砼。在设计时，考虑到各种因素对管材的破坏影响，预 1 Introduction Concrete pipe for agricultural low pressure water delivery irrigation, because of its durability and easy to shape a variety of caliber characteristics, welcomed by the majority of farmers friends. Often, most of these concrete pipes are manufactured by centralized prefabrication. After passing inspection, they are transported to the construction site. Due to the application of cost constraints, wall without reinforcement, as plain concrete. In the design, taking into account the destructive effects of various factors on the pipe, pre-