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我国以钢绞线为主筋的中小跨度的先张法预应力混凝土桥梁,从1975年开始试生产,迄今已有10个单位正式生产和试生产。我段在铁道部专业设计院和局勘设所等单位帮助下,并学习了辽阳、昌平、徐州等兄弟厂生产经验,于1981年1月成功地灌注了第一孔12米低高度先张法预应力混凝土曲线梁。3月1日进行钢绞线放松作业,并对钢绞线和混凝土应力进行测定,5月30日又
In our country, the pretensioned prestressed concrete bridges with medium and small spans as the main reinforcement of steel strands have been put into trial production since 1975, and so far 10 units have been formally produced and put into trial production. With the help of such institutes as the Professional Design Institute of the Ministry of Railways and the Bureau of Survey and Mapping, I studied the production experience of brother factories such as Liaoyang, Changping and Xuzhou. In January 1981, I successfully perforated the first hole with a height of 12 meters Law prestressed concrete curve beam. March 1 to relax the work strand, and strand and concrete stress determination, May 30 and