U girder is an optimized form of a prestressed concrete bridge, primarily composed of bottom plate, web plate, and transverse beams. It possesses high aesthetic appeal, short construction periods, and low investment costs, offering distinct advantages. This article provides a brief analysis of the construction characteristics and comparison U girder of subway viaducts.

Construction Characteristics of U Girders

During the precast process of U shaped girder, it can be found that U shaped girder have the following characteristics:

Firstly, it uses a post-tensioning production process that requires high technical requirements for the positioning of the steel bars of the U-shaped beam itself, and requires high precision.

Secondly, the concrete pouring part is a thin-walled fine component, and the U beam is relatively thin. During the pre-fabrication process, technicians must ensure uniform stress throughout the process to prevent uneven stress.

Thirdly, except for the anti-flow bar process, other steel bars should not be welded. The binding distance, position, and protective layer thickness of the steel bars must be strictly required to avoid data errors.

Fourth, the U girder is an open structure with weak torsional stiffness and needs to bear a large beam load, which requires high post-tensioning prestressing.

From the above points, it can be seen that during the prefabrication process, technicians must strictly control the process to ensure stable prefabrication construction quality of U-shaped girder and avoid the occurrence of bubbles, honeycombs, cracks, pitting, cracks, and other diseases.

Comparative Analysis of U Girder Construction

Compared to traditional box girder structures, the prefabricated construction technology of U-shaped beams is significantly different. From a cross-sectional comparison, cross-sectional design of the traditional box girder structure is a closed thin-walled cross-section type with relatively strong torsional stiffness. Compared to the T-shaped cross-section structure, it has a higher cross-sectional efficiency index; from the perspective of the bottom plate area and the top surface area of the box girder construction, its area is larger, has a stronger positive and negative bending bearing effect, and it can meet the configuration requirements better. Therefore, in the past, box girder structures have been widely used in bridge design and construction.

The U-shaped beam is a relatively new type of prestressed concrete bridge structure. Its cross-section design is an open thin-walled section. The main structure is composed of a base plate and a web beam, and it is a bottom-bearing prestressed concrete bridge type. Compared to traditional box girder structure technology, the U girder construction technology has lower costs and shorter construction periods. The bridge after construction has a more beautiful appearance and a stronger noise reduction effect, which is in line with the trend of modern urban rail transit construction. .

To Wrap Up

Based on the above articles, U girder demonstrate strong operability in the construction of urban subway viaducts, and have a short construction period, high efficiency, and strong safety. Its construction process is stable and can effectively ensure construction quality. Furthermore, it also has characteristics of reasonable prices and low costs, which can effectively improve the capital utilization rate of urban subway viaduct construction, meet the construction and development needs of urban rail transit, and has distinct application advantages and broad development prospects.