钢筋工培训教材
目 录
1-1 钢筋的配料和代换 ................................................................................. 2 1-1-1下料计算; ............................................................................................. 2 1-1-2基本计算 ................................................................................................. 2 1-2-3钢筋代换: ............................................................................................. 3 1-2 钢筋加工 ............................................................................................... 4 1-2-1 钢筋除锈 ................................................................................................ 4 1-2-2 钢筋调直 ................................................................................................ 5
1-2-2-1 机具设备 ..................................................................................... 5 1-2-2-2 调直工艺 ..................................................................................... 7 1-2-3 钢筋切断 ................................................................................................ 8
1-2-3-1 机具设备 ..................................................................................... 8 1-2-3-2 切断工艺 ..................................................................................... 9 1-2-4 钢筋弯曲成型 ...................................................................................... 10
1-2-4-1 钢筋弯钩和弯折的有关规定 ................................................... 10 1-2-4-2 机具设备 .................................................................................... 11 1-2-4-3 弯曲成型工艺 ........................................................................... 14 1-2-5 钢筋加工质量检验 .............................................................................. 18 1-2-6 弯曲成型工艺 ...................................................................................... 19
1-1 钢筋的配料和代换
钢筋配料:根据施工图,分别确定钢筋的种类、下料长度、根数、重量,并填写配料单;
1-1-1下料计算;
基本概念:
1) 外包尺寸:钢筋的外轮廓尺寸(外包就是曲线切线的交点连成的直线段); 2) 轴线长度:钢筋的截面圆心的集合;
3) 量度差值:钢筋弯曲段的外包尺寸与轴线长度的差值;
4) 下料长度:各段直线钢筋外包长度之和-量度差值+弯钩增加长度=轴线长
度;
(1) 直钢筋下料长度:外包尺寸+弯钩增长值
(2) 弯起钢筋下料长度:直段长度+斜段长度+弯钩增长值-量度差值 (3) 箍筋下料长度:外(内)皮尺寸+箍筋调整值
5) 配料单:工程名称、构件名称、钢筋编号、钢筋简图及尺寸、钢筋直径、钢
号、数量、下料长度及重量;
1-1-2基本计算
1) 弯钩增加长度
180°弯钩增加长度=半园周长(取钢筋轴线上的弯弧直径)+平直段长-弯钩的弯弧外半径。代入规范所规定的数据,可得:(3.5dπ/2+3d)- 2.25d =8.5d-2.25d=6.25d。
(a) 1800弯钩 (b) 900弯钩