丰台桥梁工厂用离心法生产混凝土管桩,已有近三十年的历史。1966～1970年发展为预应力混凝土管桩,在技术经济上又向前迈进了一步。如生产40万米预应力离心混凝土管桩代替钢管桩,估计可节约钢材3万余吨;代替普通离心混凝土管桩,也可节约钢材1万余吨。可见,采用预应力混凝土桩省钢省钱,意义重大。预应力混凝土桩的某些技术性 The Fengtai Bridge Plant has produced concrete piles by centrifuging for nearly 30 years. The development of prestressed concrete pipe piles from 1966 to 1970 was a step forward in terms of technology and economy. For example, 400,000 meters of prestressed centrifugal concrete pipe piles instead of steel pipe piles is estimated to save more than 30,000 tons of steel; instead of ordinary centrifugal concrete pipe piles, it can save more than 10,000 tons of steel. It can be seen that using prestressed concrete piles to save steel and save money is of great significance. Some technical aspects of prestressed concrete piles