The world's first high -speed railway concrete beam holding bridge

In the early morning of September 13th, the world's first high -speed railway concrete beam laid -up bridge designed by the Fourth Court of Railway Courtyard, the main bridge of the Guanjiang Tail Bridge of Guangshan Railway, successfully coexist.

The Zengjiang Extra Bridge is a controlled project of Guangshan Railway. It is located in Shidan Town, Zengcheng District, Guangzhou, with a total length of 2569 meters. Among them, the main bridge uses the double tower cable -stayed bridge, the main crossing of 260 meters across the main channel of Zengjiang, and the main tower adopts the main tower. Reinforced concrete H bridge tower, the tower is 100 meters high. After the bridge, it marks that the construction of the Guangshan high -speed rail will enter the entire track laying stage.

Fight with the building blocks to build a bridge

The bridge is the world's first railway concrete beam cable bridge for the prefabricated assembly technology in the world. The prefabricated assembly of the section is to complete the concrete beams of the large section in the factory, and assemble it at the scene like "patching the blocks". This can not only greatly shorten the construction cycle, but also achieve the intelligent, standardized, and modular assembly construction of the bridge.

Add "blended" high -tech to the beam

In order to adapt to the characteristics of the prefabrication of the beam body, the "blending" technology is also adopted in the design.

Just as mixed with cotton and polyester fibers in the fabric of the clothes, with the breathability of cotton and the smoothness of polyester fibers, two types of prestressed tendons are also used in the beam body -the prestressed steel bars of the refined rolling thread+prestressed steel Gling lines, fine -rolled thread prestressed steel bars can be fixed flexibly, prestressed steel twisted wire can reduce "relaxation", allowing "rubber bands" to be tightened, lasting and effective.

Through the ideas of the design team, the prestressed "blending" design of this beam body has greatly improved the characteristics of structural stress and ensuring that the bridge is more secure, economical and reasonable.

The "tenon and tenon structure" of the new era

After the building blocks are overlap, how to ensure that they are closely connected?

The design team was inspired by the ancient tenon -and -mortise structure, and innovatively proposed the "large tooth block shear bonding design design" -the use of large tooth block construction measures in the beam section, and "building blocks" like a tenon bumpy bite -bite -babbing bite -babes. , Tightly connect together.

Combined with the structural characteristics of the Zengjiang Extra Bridge, since December 2019, the Fourth Court of Railway has fully launched a technical research, overcome the five major technical problems, and completed the major topic of the National Railway Group "Guangshan High -speed Railway Large Slip section prefabricated assembly concrete cable holder. "Bridge key technology and intelligent research" has accumulated deep technical experience. The Bridge Scientific Research Research Team published 3 papers in the domestic core journals and applied for 6 national patents.

After the completion of the Zengjiang Extra Bridge, it will become the world's first railway concrete beam holding bridge that applies prefabricated assembly methods in sections, which greatly promotes the development of my country's railway concrete cable -keeping bridge construction technology and concrete beam section prefabricated assembly method.

- END -