请问建筑上扎架用钢管，是哪种型号？2.75吗？一顿钢管大约长多少米？ 声测钢管A57*3.5一顿多少米
\u67e5\u53e3\u7ecf4.8\u516c\u5206\u7684\u5efa\u7b51\u7528\u67b6\u624e\u94a2\u7ba1l\u7c73\u6709\u591a\u5c11\u516c\u65a4\u6211\u662f\u4e00\u540d\u5efa\u7b51\u5de5\u4eba\u60f3\u638c\u63e1\u4e00\u70b9\u8fd9\u65b9\u9762\u7684\u77e5\u8bc6\u53e3\u5f844.8\u662f\u5185\u5f84(r2)\u8fd8\u662f\u5916\u5f84(r1)
\uff3b(\u03c0r1²-\u03c0r2²)*L\uff3d7.8
L\u662f\u7ba1\u7684\u957f\u5ea6\uff0c7.8\u662f\u94c1\u7684\u6bd4\u91cd
\u3000\u3000\u666e\u901a\u78b3\u94a2\u3001\u5408\u91d1\u94a2\u94a2\u7ba1\u7406\u8bba\u91cd\u91cf\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a
\u3000\u3000W=0.02466\uff08D-S\uff09S ------\u94a2\u7684\u5bc6\u5ea6\u53d67.85kg/dm³
\u3000\u3000\u6ce8\u91ca\uff1a\u6bcf\u7c73\u91cd\u91cfkg/m=\uff08\u5916\u5f84-\u58c1\u539a\uff09*\u58c1\u539a*0.02466 \u5355\u4f4d\u53d6\u6beb\u7c73\uff1amm
\u3000\u3000\u6240\u4ee5\u042457*3.5\u7684\u94a2\u7ba1\u6bcf\u7c73\u91cd\u91cf\u4e3a\uff1a
\u3000\u3000(57-3.5)*3.5*0.02466=4.618\u516c\u65a4/\u7c73\uff1b\u4e00\u5428\u5927\u6982\u6709216.544\u7c73\u3002
脚手架钢管,48*2.75 或48*3 标准的脚手架。
联系电话：0635-8876700 鑫航钢管厂
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