不同跨度的電纜橋架結構受力分析
從可持續(xù)發(fā)展視點動身，橋架內宜預留10回以上電纜通道。在滿足電纜安置的斷面需求尺度的基礎上，30m和40m跨度的橋架選用一般鋼結構桁架能滿意承載力和剛度的要求。40m以上跨度的電纜橋架主張選用預應力鋼桁架結構系統(tǒng)，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.
對桁架承載力起操控效果的工況是的組合，因而關于簡支的預應力鋼桁架，選用雙折線預應力安置方法效果較好。提出了一些標準化締造的主張。
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.
隨著國民經濟快速增長，各地關于供電的需求進一步進步，但由于土地大范圍的開發(fā)，往往使得輸電線路途徑的挑選困難，常常遇到高壓電力電纜跨過河流的狀況?？邕^較寬河流時較多的選用電纜橋架結構，其間以混凝土渡槽和鋼結構橋架為常見。
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.
混凝土渡槽橋架計劃需在河面支設模板澆筑溝槽混凝土并維護成型，其缺陷是支模較困難，施工周期長，施工難度較大，如在航道上施工會較長時刻影響通航，受時節(jié)和當?shù)睾竭\交通狀況影響較大。
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.
現(xiàn)在，鋼結構的規(guī)劃和締造技能日漸，選用鋼結構橋架能夠完成較大跨度的直接跨過而無需在河流中部設置支點，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.
