在现有机井中,有90%以上使用无砂砼井管,它具有材料来源广泛,制作工艺简单,产品价格低廉,使用寿命长等优点,颇受群众欢迎。近年来,随着井灌事业的发展,特别是“利用银行贷款发展平原井灌项目”下达之后,无砂砼井管需求量急剧增加。为了保证井管质量,提高成井率,广大凿井工作者迫切要求掌握无砂砼井管预制技术,但目前还没见到系统介绍这方面知识的书籍。鉴于此,笔 More than 90% of the existing wells use sand-free concrete well pipe. It has the advantages of wide source of raw materials, simple production process, low price and long service life. In recent years, with the development of well irrigation business, especially after the issuance of the project “Development of Plain Well Irrigation Project with Bank Loans”, the demand for non-sand concrete well pipes has dramatically increased. In order to ensure the quality of well tube and increase the rate of well completion, the majority of shaft sinking workers are urgently required to master the prefabrication technology of sandless concrete well tube. However, no books have been found systematically introducing this knowledge. In view of this, pen