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在钢筋混凝土结构中,钢筋多为3号和5号平炉钢,其接头多用接触焊接法(对焊和点焊)制造。苏联已经生产了对焊直径100公厘以下钢筋的对焊机和直径100+60公厘的点焊机。接触焊的接头质量很高,生产率大,而且节约金属。但是在安装条件下的接头,特别是装配式钢筋混凝土的钢筋接头,由于高功率固定性的接触焊机灵活性不够,不能在工地上应用,只能用普通电弧焊接法施焊.此时必须把钢筋弯折(图1а)或采用连接件(如钢筋接头或角钢等,见图1б和в)。这样不但浪费金属,而且生产率低。由于这种方法要求很长的焊缝才能保证强度,因而对装配式钢筋混凝土结构的接头来说,不一定可用,即使勉强应用,也因焊接应力很大,常使混凝土开裂。所以就必须研究适合上述条件的焊接
In the reinforced concrete structure, the steel is mostly No.3 and No.5 open hearth steel, and its joints are mostly made by contact welding (butt welding and spot welding). The Soviet Union has produced butt welders with buttresses of up to 100 mm in diameter and spot welders with a diameter of 100 + 60 mm. Contact welded joints of high quality, productivity, and save the metal. However, under the conditions of the joints, especially the reinforced concrete joints, due to high-power fixed contact welding machine flexibility is not enough, can not be applied on the site, only ordinary arc welding method of welding. Bend the bar (Figure 1 a) or use connectors (such as bar joints or angles, etc., see Figures 1 and 2). This is not only a waste of metal, but also low productivity. Because this method requires very long welds to ensure strength, it is not always available to the joints of fabricated RC structures. Even barely applied, cracks are often caused by large welding stresses. So we must study for the above conditions of welding