一、关于菱形配筋原理的提出振动挤压管在我国已有15年以上的生产史了,我们已经积累了不少的经验与教训。目前在生产中仍存在着许多问题急待解决。其中钢筋骨架的质量问题、纵向预应力值的不足问题长期以来未曾得到满意的解决。繁杂的纵向筋的调直切断、镦头、运输、穿丝张拉及封油泥堵眼等等工序,给生产带来很多麻烦。在加料振动过程中,又往往会发生 First, on the rhombic reinforcement principle proposed Vibratory extrusion tube in China has more than 15 years of production history, and we have accumulated a lot of experience and lessons. At present, there are still many problems that need to be solved in production. The problem of the quality of the reinforcing steel frame and the lack of the longitudinal prestress value have not been satisfactorily solved for a long time. The complicated straightening and straightening of the longitudinal ribs, boring heads, transportation, threading tensioning, and mud sealing and mud sealing are all problems that have caused a lot of trouble for production. In the process of adding vibration, it often happens