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近年来,我在现场施工中总结出几种就地取材、简单易行、快速简便和经济可行的施工方法,可以有效地保证工程质量,取得良好的效果。一、用“三四五”法放水平线在垂直面上一般用水准仪或水平尺来确定水平线,但当条件不允许且又急于确定水平线时,可用“三四五”法放水平线。如图1要确定在垂直墙面上的MN直线是否水平,可先在墙面上选一点O,过O点用铅垂线作垂线OA,在OA上取OA=3(单位长,下同),过点O用灰线引直线OB,量OO′=4,用小钢尺过点A作直线AC,量AO″=5,移动OB的B端、AC的C端,使O′与O″重合,则∠AOB′=90°,OB′为水平线,则可判定MN是否水平。
In recent years, I summed up several on-site construction materials, easy, rapid and economical and feasible construction methods, which can effectively ensure the quality of the project and achieved good results. First, with the “three four five” law put the horizontal line in the vertical plane generally level or horizontal ruler to determine the horizontal line, but when the conditions do not allow and rush to determine the horizontal line, the “three four five” method to put the horizontal line. As shown in Figure 1 to determine whether the MN vertical line in the vertical wall is horizontal, you can choose a point on the wall first O, O points vertical plumb line with OA, OA take OA = 3 (unit length, under The same OO, OO ’= 4, point A with a small steel rod for a straight line AC, the amount of AO “= 5, moving the OB side of B, AC of the C-side, so that O’ And O ”overlap, then ∠ AOB ’= 90 °, OB’ is the horizontal line, you can determine whether MN level.