| 选用桥架的步骤 |
| 添加时间：2019/2/23 16:10:48 浏览次数： |
| (1)确定桥架宽度、层数、支撑点的型式和间距、以及电缆在各层桥架上的分布。 (1) Determine the bridge width, number of layers, type and spacing of support points, and the distribution of cables on each layer of the bridge. (2)计算每层电缆的均布荷载(kN/ m2),初步确定桥架的型号、规格。 (2) Calculate the uniform load (kN/m2) of each cable layer, and preliminarily determine the type and specifications of the bridge. (3)按最大的电缆总均布荷载值来验算桥架强度。验算式如下： (3) Calculate the strength of bridge frame according to the maximum total uniform load of cable. The checking formulas are as follows: Q使用=q1+q2 Q uses = Q1 + Q2 式中：q1 --电缆的均布荷载（各层的均布荷载中取最大值）（kN/ In the formula: Q1 - the uniform load of the cable (the maximum value of the uniform load of each layer) (kN)/ m2），均布荷载是托盘、梯架或电缆槽的荷载； M2), the uniform load is the load of pallet, ladder or cable trough. q2--考虑电缆敷设或检修时,人的重量等效的均布荷载（kN/ Q2 - Consider the equivalent uniform load (kN) of human weight when laying or repairing cables./ m2）,q2值的计算，人的重量一般按p=90kg计。 In the calculation of M2 and q2, the weight of a person is generally calculated as p=90 kg. 表示集中荷载和均布荷载的弯距如图2 Bending distances representing concentrated and uniformly distributed loads are shown in Figure 2. 按最大弯距相等的条件折算： Converted according to the condition that the maximum bending distance is equal: 式中：P--1人的荷载(kg) Formula: P-1 load (kg) ι--1个支撑点间距(若支点间距不等时取最大值)(m) _-1 support spacing (maximum value if the support spacing is unequal) (m) q2--1 人的等效均布荷载(kg/m) Equivalent uniform load of q2-1 person (kg/m) 根据上述初步确定的桥架型号、规格及支点间距,查阅生产厂家的样本资料,反复核查间距和桥架型号,直至满足负荷要求为止。 According to the bridge type, specifications and fulcrum spacing initially determined above, the sample data of the manufacturer are consulted, and the spacing and bridge type are checked repeatedly until the load requirements are met. (4)挠度 (4) deflection 挠度值如何取定,尚无明确的规定,在重负区显然应考虑减小绕度,这意味着钢材的用量会相应增加,因此,计算时只要充分利用钢材的最大允许应力,并保证有足够的安全系数,一般最大挠度与跨距(支撑点间距)之比取1/250~1/150为宜。 How to determine the deflection value has not been clearly stipulated. Obviously, the reduction of the www.fenqieji.net.cnwww.qiezhiji.net.cnwww.weishengzhiji.com.cnwww.gangxianwei.net.cn www.wushuichulii.cnwww.jiedixuanxian.cnwinding should be considered in the heavy load area, which means that the amount of steel will increase accordingly. Therefore, as long as the maximum allowable stress of steel is fully utilized and enough safety factor is guaranteed, the ratio of the maximum deflection to the span (spacing between support points) is generally 1/250-1/150. |
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