拱顶油罐罐顶设计中应注意的问题

扇形板形式的拱顶是国内拱顶油罐普遍采用的拱顶结构，其展开图按惯例都设计成两侧为直线，两端为圆弧的形状。但在实际安装中常出现扇形板中部搭接宽度达不到设计要求的问题，造成拱顶的返修，施工周期延长，经济效益下降。从剖析现有文献中给出的扇形板几何计算公式入手，对这一问题进行了深入研究，找到了扇形板中部搭连宽度不足的原因，通过对拱顶对接结构（不搭接）的扇形板几何计算，得出了扇形板侧边不是直线而是曲线的结论，

Some Design Points for Tank Top of the Dome-Roof Tank.

The dome-roof consisted of fan-shaped plates is the structure which is generally adopted in domastic construction for dome-roof tank. However,the problem that insufficient width of lap joint between the middle parts of fan-shaped plates often exists due to the plate with the shape of straight lines at its two sides and arcs at its two ends designed according to its stretched-out view by usual practice,resulting in reconstruction of the dome roof,longer construction period and decreasement of economical benefits. Through profound study on this problem starting with analyzing the geometrical equations calculating fan-shaped plate given in current literatures,the cause that the insufficient width of lap joint between the fan-shaped plates is found,and it is concluded that the sides of fan-shaped plate are not straight lines but curves by geometrical calculating for fan-shaped plate with butt joint (not lap joint Structure. New relative formulae are given, involving fewer relative parameters. It is more simple to calculate the arc length of the two ends of the plate and is easier to observe the curves' shape.