在建筑工地上,我们常会听到一句话,即“按图施工”。这里的图指的是建筑施工图,而一幢房屋建筑是立体的东西,它有长、宽、高三个向度的尺寸;平面、立面、剖面图则均限于表达两个向度的尺寸,没有立体形象。如平面图只能表示长度和宽度,立面图只能表示高度和宽度(或长度),因此,只有将平、立、剖面图按一定步骤联合起来 On the construction site, we often hear a sentence that “construction according to plan”. The map here refers to the construction drawings, and a building is a three-dimensional thing. It has three dimensions of length, width, and height. The plane, elevation, and profile are all limited to two dimensions. There is no stereoscopic image. For example, the floor plan can only show the length and width, and the elevation can only show the height and width (or length). Therefore, only the flat, vertical, and sectional drawings can be combined according to certain steps.