论文部分内容阅读
近年来,我国和世界上许多国家和地区一样,出现了严重的缺水现象,全国约有200多个城市缺水。随着输水量的不断增加及输水距离的拉长,输水管材逐断向大口径、高压力发展,对输水管材的需要量也日趋增加。就管材材料而言,我国有铸铁管、钢管和预应力砼管三种。其中,中小口径铸铁管的质量存在着很大问题,经常发生爆裂事故,大口径铸铁管国内尚未生产。由于钢管耗钢量多,售价也较高,目前仅用于特殊工程的大口径输水管线。预应力砼管,虽在国内已有几十年的使用历史,但是要大批量生产大口径、高压力管(指φ1600mm以上),
In recent years, as in many countries and regions in the world, China has experienced serious water shortages, and there are about 200 cities in the country that lack water. With the continuous increase of the amount of water and the lengthening of the distance of water transmission, the water supply pipes are progressively developed toward large diameters and high pressures, and the demand for water transmission pipes is also increasing day by day. In terms of pipe materials, China has cast iron pipes, steel pipes and prestressed concrete pipes. Among them, the quality of small and medium sized cast iron pipes is very problematic, and bursting accidents often occur. Large-diameter cast iron pipes have not yet been produced domestically. Due to the large amount of steel consumed by the steel pipe and the high selling price, it is currently only used for large-diameter water transmission pipelines for special projects. Although pre-stressed concrete pipes have been used in China for several decades, large-scale, high-pressure pipes (above φ1600 mm) have to be produced in large quantities.