钢筋一般知识.doc

钢筋知识
一、钢筋一般知识
1、 钢筋进场需有产品质量证明书，进场后应进行二次复检，检验以同批、同牌号、同径级、同一交货状态每60T为一检验批，冷拉20T为一检验批；
2、 钢筋按照钢及钢产品一般交货要求GB/T17505-1998的要求：
①、交货的重量、级别、径级、牌号、生产厂家、经销商、到货日期、车号、炉号、执行的标准等等；
②、力学性能、化学成分、B类钢材的冲击检验、质检检验专用章、代表签字及第三方检验章及签字等；
③、外观检查，钢筋应标写厂名、直径、等级等；
3、钢筋混凝土用热轧光圆钢筋GB13013-91及钢筋混凝土用热轧带肋钢筋GB13788-2000：
①、化学成分分析1组（只），弯曲2组、拉伸2组；拉伸试验伸长率为（Lu-L0）/ L0，其中L0为原始标距，其值为5d，Lu为断后标距；
②、弯曲试验180，无裂纹；
③、见证取样时在钢筋端头不小于50CM处取得，直径大于20MM的钢筋取样长度为45CM两根，30CM两根；直径16、18、20MM的钢筋取样长度为40CM两根，25CM两根；直径小
Reinforcement of knowledge
1, reinforced the general knowledge
1, reinforced the need for quality certificate approach, approach should be carried out after the second re-examination, examination with the same batch, same brand, same diameter, the same delivery conditions for a test every batch of 60T, 20T for the cold-drawing inspection lot;
2, reinforced steel and steel products in accordance with the general delivery requirements GB/T17505-1998 requirements:
①, delivery, weight, grade, diameter class, brand, manufacturer, distributor, arrival date, number, heat number, the implementation of standards, etc.;
②, mechanical properties, chemical composition, B type steel impact test, quality inspection seal, signature and third party inspection on behalf of Chapter and signed, etc.;
③, visual inspection, reinforcement should be marked to write plant name, diameter, grade, etc.;
3, the reinforcement of concrete rolled round bar GB13013-91 and the reinforcement of concrete rolled ribbed steel GB13788-2000:
①, the chemical composition of a group (only), group 2 bending, stretching group 2; tensile elongation test (Lu-L0) / L0, where L0 is the original gauge, the value of 5d, Lu to bring up the rear gauge;
②, 180 bending test, no cracks;
③, witness the end of the first sample of reinforced obtaining not less than 50CM diameter greater than the sample length of reinforced 20MM 45CM 2, 30CM 2; diameter 16,18,20 MM reinforced sample length 40CM 2, 25CM 2 root; diameter small
 

2009-8/钢筋一般知识.rar

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