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20世纪60年代初,交通部为加强公路战备工作,适应特殊情况下的军事行动、突发事件,以及后来的抗震、抗洪抢险救灾等应急交通保障,使被毁桥梁迅速抢修、恢复通车,于1962年4月下达研制和生产的装配式公路钢桥(即321钢桥)的任务,该产品一直是国家重要的国防交通战备储备物资。由于
In the early 1960s, the Ministry of Transportation accelerated the readjustment of the road to combat readiness and rehabilitation of the destroyed bridge in order to strengthen the road readiness work, adapt to the special military operations, emergencies and subsequent emergency traffic support such as earthquake resistance and flood fighting and disaster relief. In April 1962, the task of developing and manufacturing the fabricated highway steel bridge (ie 321 steel bridge) was issued, which has been a national important reserve of national defense traffic control and readiness. due to