如图所示计算10根钢筋混凝土预制柱的预埋铁件工程量:
解(1)计算-10钢板理论重量
m-1:0.4×0.4×78.5㎏/㎡×10=125.60㎏
m-2:0.3×0.4 ×78.5㎏/㎡×10=92.40㎏
m-3:0.3×0.35 ×78.5㎏/㎡×10=82.40㎏
m-4:2×0.1×0.32 ×2×78.5㎏/㎡×10=100.50㎏
m-5:4×0.1×0.36 ×2×78.5㎏/㎡×10=226.10㎏
(2)计算¢ 12、 φ18 钢筋理论重量
m-1: ¢ 12 钢筋:2×(0.3+0.36×2+12.5×0.012)× 0.888㎏/m×10=20.80㎏
m-2: ¢ 12 钢筋:2×(0.25+0.36×2+12.5×0.012)× 0.888㎏/m×10=19.90㎏
m-3: ¢ 12 钢筋:2×(0.25+0.36×2+12.5×0.012)× 0.888㎏/m×10=19.90㎏
m-4: φ18 钢筋:2×3×0.38× 2.00㎏/m×10=45.60㎏
m-5: φ18 钢筋:4×3×0.38×2.00㎏/m×10=91.20㎏
小计:20.80+19.90+19.90+45.60+91.20=197.4 ㎏
合计:627+197.4=824.4 ㎏ 预埋铁件工程量=0.824 t
4、钢筋工程量计算实例
(1)钢筋混凝土现浇板如图所示计算10块板的钢筋工程量
解:① φ8=(2.7-0.015×2)×[(2.4-0.015×2)÷0.15+1]×0.395 =2.67×13×0.395 =13.71 kg
② φ8=2.37×19×0.395=17.79 kg
③ φ12=(0.5+0.1×2)×[(2.67+2.3)×2÷0.2+4 ]×0.888=33.56 kg
④ φ6.5=(2.67 ×6+2.37 ×6) ×0.26=7.86 kg
小计: φ10以内:(13.71+17.79+7.86)×10=393.60 kg
φ10以上:33.56×10=335.60 kg
铁马钢筋按经验公式1%计算:
φ10以内:( 393.60 + 335.60 )×0.01=7.29 kg
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