To do the calculations for the deflection and the flaw width of pre stressed concrete tower drum, the stiffness of the cross sections is essentially basic data.
在预应力混凝土塔筒的挠度和裂缝宽度计算中，截面的刚度是必不可少的基本资料。
The axial gap of the balancing drum and a cross channel is a cone-shaped structure with a small entrance and large exit and can prevent from being obstructed by sand flowing through the gap;
平衡鼓和交叉流道的轴向间隙为入口小、出口大的锥形 结构，防止被流经间隙的砂子阻塞；
Moreover, as the radial dimension of the rotary drum or the cross rod is larger, no dart can be formed in the middle bending position of the fabric of the trousers after long-term laying.
此外，由于转筒或横杆的径向尺寸较大，长期搭放不会在裤子布料的中间弯折处造成死褶。
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