用H型钢吧,大致HN200X100X5.5X8,22kg/m,5.33m长,用6根,间距是5x2.1=10.5m吧(没做计算)工字钢桥型也行,I18和上面的差不多,就是腔游重伍消销些加密也好,按1米间距,用10号工字钢吧