Application in Cable-stayed Bridge Construction

The construction technology of long-span continuous bridges is widely used in the construction of cable-stayed bridges, playing a crucial role in modern bridge construction. The cable-stayed bridge is a relatively special bridge structure in modern bridge structures. The cable-stayed bridge is a bridge structure in which many cables on the main girder are directly connected to the bridge tower, typically including the cable tower, the main girder and the stay cable. At the same time, the cable-stayed bridge uses cables instead of anchors, forming a long-span multi-span elastic support continuous bridge. Therefore, the cable-stayed bridge's stay cable is the main force-bearing component, and the traction force is relatively large. In bridge construction, the construction technology of tensioning and beam segment traction is mostly used to meet the force requirements of the bridge. Additionally, during the construction of the cable-stayed bridge, it is crucial to ensure that the steel wire of the stay cable cannot be twisted, which will significantly improve the bridge's construction quality. In the construction of cable-stayed bridges, the construction technology used for long-span continuous bridges also needs to be considered.

(1) During the design stage of cable-stayed bridge construction, the integrated design of the bridge deck crane and the beam end traction guiding device should be fully considered. This design effectively reduces the load at the front end of the cantilever, thereby enabling the bending radius of the stay cable to meet the actual needs.

(2) During the construction of the cable-stayed bridge, the main girder of the long-span bridge must be closely monitored to prevent errors. During the construction of the main girder, it 's crucial to ensure that the axis offset error should be controlled between -10 and 10, the deflection error should be controlled between -20 and 20, the offset of the closing height difference should be controlled between -30 and 30, and the linear error should be controlled between -40 and 40.

Application for Arch Bridge Construction

The construction technology for long-span continuous bridges is more mature in the construction of arch bridges. Arch bridges are the most widely used in bridge projects at present, and they are also a type of long-span bridge construction. The technology of the construction technology of long-span continuous bridges in the construction of arch bridges primarily involves:

(1) Arch bridge construction primarily involves the installation of steel pipe arch ribs and rope hoisting.

(2) Prefabricated arch ribs are primarily used in rope hoisting, but the quality of prefabricated arch ribs, such as strength, must be closely inspected to ensure that the quality of bridge construction meets the standards.

(3) If steel pipe arch ribs are used for construction, the installation methods that can be considered include the inclined cable buckle method, the non-bracket hoisting method, the less-bracket hoisting method, etc. The specific construction method should be determined based on a comprehensive evaluation of the geotechnical engineering conditions in the construction area.

Prestressing Technology Application

With the continuous development of bridge construction components,  bridge construction technology has become increasingly diverse. In recent years, the number of long-span continuous bridge projects has gradually increased, while at the same time, it has promoted the rapid development of bridge precast structures. The application of prestressing technology is crucial for improving the structural quality of long-span continuous bridges and is a crucial aspect of construction design, such as prestressed cable-stayed bridges and prestressed suspension bridges. By using prestressed components and prestressed model exercises, the overall performance of the bridge can be effectively designed and strengthened. This is, through prestressed construction, which analyzes the stress state of the bridge construction and further improves the design quality of the bridge. At the same time, constructing prestressed components can minimize the impact on the quality of the subsequent link or stage. Furthermore, a large number of prestressed components are used in the bridge prestressing construction process, and the lap between different components can effectively shorten the construction period and improve construction efficiency. The application of prestressing technology in the construction of long-span continuous bridges can timely discover the difference between the actual stress state and the design index, which is crucial for making effective adjustments in a timely manner.

To Sum Up

In conclusion, the construction technology of long-span continuous bridges has become widely used due to its higher safety, versatility, reliability, and economy, particularly in modern bridge design. The construction technology of long-span continuous bridges has greatly advanced bridge engineering technology and has led to the development of bridge construction technology worldwide. Furthermore, the bridge structure of long-span continuous bridges has a stronger bearing capacity, making the safety and reliability of bridge engineering better, improving the service quality and service life of the bridge, and contributing to regional economic development.