早在55年夏天我们部分教师去南厂参观时,就注意到南厂有砖拱吊车梁,它已使用很久而工作情况至今良好。去年春天以来,祖国开始全面躍进,工业建设的规模空前宏伟;钢筋水泥等建筑材料普通感到非常缺乏,有时甚至因材料供应不上而严重影响工程进度,而且这种情况看来短期内不会很快改变。因此全国各地都想法找钢筋砼的代用品,重庆北京等地的设计单位不约而同地想用砖拱吊车梁。在北京某次会议上谈到这问题时,我院同志介绍说南厂有这种结构,可以走几十吨的吊车而且已用了几十年。这情况 As early as the 55th year of summer, when some of our teachers went to visit the South Plant, we noticed that there was a brick arch crane beam in the South Plant. It has been in use for a long time and its work has been good so far. Since the spring of last spring, the motherland has made a full leap forward and the scale of industrial construction has been unprecedented in scale. Ordinary materials such as reinforced concrete and cement are generally scarce, and sometimes the project progress is seriously affected by the shortage of materials and the situation does not appear to be going to be short-term Change quickly. Therefore, all over the country are looking for alternatives to reinforced concrete, Chongqing, Beijing and other places of design units invariably want to use brick arch crane beam. When addressing this issue at a meeting in Beijing, my comrades in our hospital explained that the South Plant has such a structure that it can take tens of tons of cranes and has been using it for decades. This situation