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一、概述六十年代,许昌地区部分社、队,在自己的机井旁,将拌合好的混凝土骨料或炉渣三合土,用简单的模具,拍打成U形渠。到1976年,全郊区4.8万亩耕地,已发展各种衬砌渠十九万多米,其中U形渠道四万多米,发挥了一定的灌溉效益。若干年后,砖砌明渠和预制混凝土板渠中杂草丛生,渗水越来越严重,不到十年基本全部报废,可是现浇混凝土U形渠仍然可以应用。后因管理不善,早在八十年代初已经搞得无影无踪了。
I. Overview In the 1960s, some communities and teams in the Xuchang area tapped the concrete aggregate or slag tripartite soil alongside their own wells to tap U-shaped channels with simple molds. By 1976, 48,000 mu of arable land in the entire suburbs had been developed, and a total of 190,000 meters of lining channels had been developed. U-shaped channels of over 40,000 meters of them had played a certain irrigation benefit. A few years later, the weeds in bricked open channels and precast concrete slabs were weakened and the seepage was more and more serious. In less than a decade, they basically scrapped. However, the U-shaped cast-in-place concrete can still be used. After the poor management, as early as the early 1980s has been made without a trace.