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一、概述用预应力混凝土管代替钢管不仅可以节省大量的钢材(混凝土管所用的钢材只有同直径钢管的25～30%)、降低造价(比同直径的钢管省10～15%),而且还可大大延长使用寿命,一般是钢管的2～3倍。如:日本于1935年在东北铺设的一条水泥管,在1985年挖开检查时,仍完整无损);同时,混凝土管还具有制作方便、维护简单、抗腐蚀性能好等特点,因此,不仅在钢铁产量趋于紧缺的国家大量采用混凝土管代替钢管,而且在那些钢产量较多的资本主义国家也在大量使用混凝土管。在我国随着电力事业的迅速发展,在电力系统中广泛采用大直径预应力混凝土压力
I. Overview Prestressed concrete pipes instead of steel pipes can not only save a large amount of steel (25 to 30% of the steel used in concrete pipes is the same diameter as steel pipes), but also reduce the cost (compared with the same diameter steel pipes by 10 to 15%). Can greatly extend the service life, generally 2 to 3 times the steel pipe. For example, a concrete pipe laid in the northeast of Japan in 1935 was still intact in 1985. At the same time, the concrete pipe also has features such as easy fabrication, simple maintenance and good corrosion resistance. Therefore, not only Countries where steel production tends to be in short supply use a large number of concrete pipes instead of steel pipes, and concrete pipes are also used extensively in capitalist countries where steel production is large. In China, with the rapid development of the electric power industry, large-diameter prestressed concrete pressure is widely used in power systems.