现代工厂桥式吊车大梁大都是箱形刚体,整个大梁体为塑性箱式梁结构。在吊装货物过程中,梁体受交变荷重的影响,使主梁拱度消失而变形,天车将被迫停产检修(起拱度、矫正梁体,有时还要加固)。以往起拱是采用火焰法,加固多用钢骨架焊结构,既费工,又费料,而且工期长,很不经济。 为了及时、省工、省料地检修因主梁拱度消失而变形的天车,我们遵照毛主席关于“自力更生”的教导,组成了老工人、领导干部、工程技术人员的三结合班子,自己动手,采用圆钢拉筋法加固天车主梁的工艺,在我厂4天车(起重量10吨,跨距22米)大修上试验, Modern factory bridge crane beams are mostly box-shaped rigid bodies, and the entire girder body is a plastic box-type beam structure. In the process of lifting the cargo, the beam body is affected by the alternating load, so that the crown of the main beam disappears and deforms, and the overhead crane will be forced to stop production and repair (lifting degree, correcting the beam body, and sometimes strengthening). In the past, the arch was fired using a fire method to reinforce a multi-purpose steel skeleton welded structure, which was both laborious and wasteful. It also had a long construction period and was uneconomical. In order to promptly, labor-savingly, and materially repairing the overhead cranes that deformed due to the disappearance of the main beam, we followed Chairman Mao’s guidance on “self-reliance” and formed a three-team combination of old workers, leading cadres, and engineering and technical personnel. The hands-on, round steel reinforcement method used to reinforce the main beam of the overhead crane was tested on the overhaul of our four-day vehicle (with a capacity of 10 tons and a span of 22 meters).