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关于钢筋混凝土屋架中下弦钢筋在端节点中的锚固构造,在标准图“G 117装配式钢筋混凝土桁架图集”、“G145、G146钢筋混凝土三角形屋架”和“G 314钢筋混凝土折线形屋架”中分别采用了如图2和图3(a)、(b)的锚固方案,这两种方案传力较复杂,所需材料及焊接量较多。我厂从1970年开始先后在15～22米屋架上采用了如图1的锚板锚固方案,它传力直接,用料较省,焊接量少,施焊方便。现将这几年来的实践作一小结,以供同志们参考。在锚板方案中,锚板上的圆孔,对于螺纹钢筋,应大于或等于钢筋的外缘直径及相应正公差之和,或14～25钢筋,圆孔应
The anchorage structure of the steel bar in the reinforced concrete truss in the end node, in the standard diagram “G 117 assembled reinforced concrete truss atlas ”, “G145, G146 reinforced concrete triangular truss” and "G 314 reinforced concrete The anchorage schemes of Fig. 2 and Fig. 3(a) and (b) are respectively adopted in the trussed roof truss. These two schemes have more complex transmission forces, and require more materials and welding quantity. From 1970, our factory adopted the anchor plate anchorage scheme as shown in Fig. 1 successively on a truss between 15 and 22 meters. It has direct force transmission, less material consumption, less welding, and convenient welding. A brief summary of the practice in recent years is provided for reference by comrades. In the anchor plate scheme, the round hole on the anchor plate shall be greater than or equal to the sum of the outer diameter of the steel bar and the corresponding positive tolerance, or 14 to 25 bars, for the threaded steel bar.