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昆明钢铁公司250轧钢车间,1958年3月由原北京钢铁没计总院设计。主要建筑物是18m跨度6m柱距的单层厂房,普通钢筋混凝土T形截面吊车梁,5t和10t桥式吊车各一台,工作制为重级。1958年投产后,经多次工艺改造,年产量从30000t/上升到100000t,吊车使用也日见频繁,但直到1977年吊车轨道翻修,没有发现吊车梁严重开裂的现象。1979年开始,主要生产线上40根吊车梁有32根
The 250 rolling mill of Kunming Iron and Steel Company was designed by the former Beijing Iron and Steel Institute in March 1958. The main building is a single storey building with 18m span and 6m column spacing, ordinary reinforced concrete T-section crane beams, 5t and 10t bridge cranes, and the working system is heavy. Since it was put into production in 1958, after many process transformations, the annual output has increased from 30000 t/ to 100,000 t. The use of cranes has also become more frequent. However, until the crane track was renovated in 1977, no serious cracking of the crane girder was observed. Since 1979, there are 32 crane beams in the main production line.