不同跨度的电缆桥架结构受力分析
从可持续发展视点动身，桥架内宜预留10回以上电缆通道。在满足电缆安置的断面需求尺度的基础上，30m和40m跨度的桥架选用一般钢结构桁架能满意承载力和刚度的要求。40m以上跨度的电缆桥架主张选用预应力钢桁架结构系统，可下降桁架截面高度。
From the perspective of sustainable development, more than 10 cable channels should be reserved in the bridge. On the basis of meeting the cross-section requirements of cable placement, the general steel truss is selected for the 30 m and 40 m span bridge, which can meet the requirements of bearing capacity and stiffness. For the cable bridge with a span of more than 40m, the prestressed steel truss structure system is recommended to reduce the height of truss section.
对桁架承载力起操控效果的工况是的组合，因而关于简支的预应力钢桁架，选用双折线预应力安置方法效果较好。提出了一些标准化缔造的主张。
Therefore, for the simply supported prestressed steel truss, it is better to choose the double broken line prestressed placement method. This paper puts forward some suggestions on the creation of standardization.
随着国民经济快速增长，各地关于供电的需求进一步进步，但由于土地大范围的开发，往往使得输电线路途径的挑选困难，常常遇到高压电力电缆跨过河流的状况。跨过较宽河流时较多的选用电缆桥架结构，其间以混凝土渡槽和钢结构桥架为常见。
With the rapid growth of the national economy, the demand for power supply in various places has been further improved. However, due to the large-scale development of land, it is often difficult to select the transmission lines, and high-voltage power cables often cross rivers. When crossing a wide river, cable tray structure is often used, among which concrete aqueduct and steel structure bridge are common.
混凝土渡槽桥架计划需在河面支设模板浇筑沟槽混凝土并维护成型，其缺陷是支模较困难，施工周期长，施工难度较大，如在航道上施工会较长时刻影响通航，受时节和当地航运交通状况影响较大。
The plan of concrete aqueduct bridge needs to set up formwork on the river surface, pour trench concrete and maintain it. The defect is that the formwork is difficult, the construction period is long, and the construction is difficult. If the construction is carried out on the waterway, the navigation will be affected for a long time, and the construction will be greatly affected by the season and local shipping traffic conditions.
现在，钢结构的规划和缔造技能日渐，选用钢结构桥架能够完成较大跨度的直接跨过而无需在河流中部设置支点，且施工速度快。
Now, the planning and building skills of steel structure are increasingly advanced. The selection of steel structure bridge can complete the direct crossing of large span without setting fulcrum in the middle of the river, and the construction speed is fast.
