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钢筋混凝土梁柱等主体结构大部采用低合金Ⅱ、Ⅲ级钢筋以及国外进口的类似强度的钢筋,主筋直径都比较大,大都在20mm以上。施工过程中由于固定位置的需要,有时将主筋和垂直交叉的箍筋电弧点焊(下称“粗钢筋点焊”)。在使用和研究国外进口钢筋时曾发现,粗钢筋点焊有脆断现象,因此我们在1980年制定国家建委颁发的《进口热轧变形钢筋应用若干规定》时,在第20条列入“对进口钢筋严禁采用电弧点焊和在非焊接部位上打火”的要求,但在有些地方尚未得到重视。同时,我国生产的钢筋是否也存在电弧点焊脆断现象,也是我们关心的问题。
Most of the main structures such as reinforced concrete beams and columns are made of low-alloy Grade II and Grade III steel bars, and similarly-strength steel bars imported from abroad. The diameters of the main bars are relatively large, most of which are more than 20 mm. During the construction process, due to the need for a fixed position, sometimes the main ribs and arcs that cross vertically are spot welded (hereinafter referred to as “coarse steel spot welding”). In the use and research of imported steel bars, it was found that there were brittle fractures in spot welding of coarse steel bars. Therefore, when we formulated the “Several Regulations for the Use of Imported Hot-Rolled Deformed Steel Bars” issued by the State Construction Commission in 1980, it was included in Article 20 The requirements for arc spot welding and ignition of non-welded parts are strictly prohibited for imported steel bars, but they have not been taken seriously in some places. At the same time, whether or not the steel bars produced in China also have the phenomenon of arc spot brittle fracture is also a concern.