Hengshui Kaixiang Rubber Products Co., Ltd.

As a professional manufacturer of prestressed anchors, we have the responsibility to help everyone understand the relevant operations of this equipment. Among them, how much do you know about the application of external prestressed beams in the construction of new bridges? Next, Let me give you a detailed explanation
The first type is a long bridge constructed with prefabricated segments span by span. This type is represented by bridges. The external prestressed beams use the same ordinary multi-strand steel strands and anchors as the internal prestressed ones, and also use cement grouting. Therefore, the cost of prestressing is lower. This kind of externally prestressed structure usually adopts dry joints and double shear keys in the prefabricated sections. After all the prefabricated segments of the entire span are installed on the supporting structure, external prestressing is added to form an overall structure of the span. The external prestressed beams are deflected at the steering blocks within the span. The outer casing of the external beams is made of polyethylene pipes or steel pipes. The pipes are cast integrally with the main beam at the fast turning point. This external beam can only be removed and cannot be replaced.
The second type is a prestressed concrete continuous girder bridge using cantilever construction or push construction, which usually uses internal and external mixed beam beams. In this form, external prestressed cables are used to replace a large number of prestressed tendons originally arranged in the web, which simplifies the web structure and reduces its thickness. When using cantilever
construction, the cantilever beams are linear internal prestressed, and the continuous beams tensioned after the bridge is completed are externally prestressed with large tonnage, thus eliminating a large number of beam threading and grouting processes, and making it easy to Control construction quality.
The third type is a derivative of the second type, characterized by changing the concrete box girder webs into concrete trusses or using steel structures. This type is often a representative work that integrates innovative structural concepts and beautiful appearance to form an external prestressed structure.
The fourth type is called Tanla type external prestressed structure. It places the external tendons above the effective height of the beam, where the eccentricity of the prestressed tendons was controlled within the effective height of the main beam in the past. Therefore, it has the dual characteristics of a beam bridge and a cable-stayed bridge, and can be regarded as a structural system between a prestressed concrete box girder bridge and a prestressed concrete cable-stayed bridge. It uses a partial cable structure to help the main beam bear the vertical load, thereby achieving the purpose of
reducing the beam height.
The main applications of external prestressed beams in the construction of new bridges are these. I hope the above information can be helpful to everyone's operations. If you
have any questions during the specific operation, please feel free to contact us in time. consult.
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