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杭州市种猪试验场地处杭州市西北的大观山麓,距杭州20余公里。场里除生产长自种猪外,还在1100余亩的丘陵地上种植茶叶、梨、蔬菜、西瓜等经济作物。78年开始搞喷灌,现有蔬菜、茶叶、果树喷灌700余亩,其中固定喷灌300亩,半固定喷灌400亩。共敷设钢丝网水泥管10170米,其中φ300钢丝网自应力管1860米,φ250自应力管750米,φ150自应力管3360米,φ100自应力管4200米。经过几年来的使用情况良好,即使在工作压力8公斤/厘米~2,连续工作十五昼夜也从未发生爆管、漏水现象。它和铸铁管、聚氯乙烯管相比,具有工作可靠、寿命长(约60~70年,比铸铁管还长)、不易腐蚀,不会老化等优点。且内壁经久不结污垢,管道输水能力不变,我场70年按装的φ100自应力输水管道使用十年后,内壁光滑,80年改为喷灌管道,性能不变,根根可用。而同期按装的φ100铸铁管,内壁生满锈
Hangzhou pig breeding ground is located in the northwest of Hangzhou, the foothills of the Grand, 20 km away from Hangzhou. In addition to the production of self-growing pigs in the field, but also more than 1,100 acres of hilly tea, pear, vegetables, watermelon and other cash crops. 78 years began to engage in sprinkler irrigation, the existing vegetables, tea, fruit trees sprinkler 700 acres, of which 300 acres of fixed sprinkler, semi-fixed sprinkler 400 acres. A total of laying 10,070 meters of steel mesh cement pipe, of which φ300 steel wire from the stress tube 1860 meters, φ250 self-stress tube 750 meters, φ150 self-stress tube 3360 meters, φ100 self-stress tube 4200 meters. After several years of good use, even at the working pressure of 8 kg / cm ~ 2, working continuously for 15 days and nights have never burst pipes, leakage phenomenon. Compared with cast iron pipe and PVC pipe, it has the advantages of reliable working, long service life (about 60-70 years, longer than cast iron pipe), corrosion resistance and aging. And the endurance of the wall does not end dirt, water pipe capacity unchanged, I field 70 years by the installation of φ100 self-stress water pipe ten years later, the wall smooth, 80 years to sprinkler pipe, the same performance, roots available. The same period by the installed φ100 cast iron pipe, the inner wall full of rust