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.
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.
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.
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.
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.