在现代建筑中,钢筋混凝土螺旋楼梯大为流行,但在许多工程设计中,对螺旋楼梯板只标明一个厚度,这是不正确的。据调查,施工放线也是做不到的。螺旋楼梯内外圈不等厚,可以从计算证明。图1是螺旋楼梯内圈与外圈垂直展平图,设外圈板的厚度为f_1,则内圈板的厚度为f_2。放大局部看坡度不同对板厚的影响。在外圈(图2)中,直角△ In modern buildings, reinforced concrete spiral staircases are very popular, but in many engineering designs, only one thickness is indicated for spiral staircases, which is incorrect. According to the survey, the construction of the line can not be done. Spiral staircases with unequal thickness inside and outside can be calculated from the proof. Figure 1 is a vertical plan of the inner ring and the outer ring of a spiral staircase. The thickness of the outer ring is f_1, and the thickness of the inner ring is f_2. Zoom in to see the effect of different slopes on plate thickness. In the outer ring (Figure 2), the right angle △