The balanced cantilever construction method refers to a construction method in which drop-offs are set up on both sides of the bridge pier, the prefabricated concrete beams are cantilevered section by section to the mid-span in a balanced manner, and prestressed section by section is applied until the bridge span structure is closed.
 

The balanced cantilever method bridge construction is suitable for bridges with a span of 50~250m. The method easily adapts to irregular and long spans, congested project sites, rugged and watery terrain, railway crossings and environmentally sensitive areas. Also, it is very suitable for building cable-stayed bridges. This is because once the segments are placed, they can be supported by new cable stays at each stage of installation, without the need for additional auxiliary supports, making it an economical and practical approach for long cable-stayed bridges.

 

After construction of the bridge's lower infrastructure was completed, the complete pier segments were used as mounting platforms to support formwork runners for the cast-in-place segments. Complete the positioning of the bridge's lower infrastructure and special formwork, then fix the corresponding formwork on both sides of the bridge pier, and then pour concrete on both sides of the bridge pier. The formwork trolley is synchronized with each section of pouring to continue the segmented construction. Bring the balanced pair of segments together until you reach the midpoint of the connection.

The preliminary preparation work is the same as above. When ready, start to place the first pair of prefabricated segments, then build the wet joints, then install the next pair of prefabricated segments, consolidate and construct World Wind, repeat the above steps until the construction is completed, and finally dismantle Just lift the stand.

 

1. Shorten the construction time: The balanced cantilever method construction is much faster than the traditional method. The segments can be poured off-site and quickly erected. The upper and lower structures of the bridge can be operated in parallel, but the construction accuracy is high, so it can be done in It is selected for bridges with a span of less than 100 meters. Shorten the construction period and improve construction efficiency.

 

2. Reduce interference with traffic: The balanced cantilever method can be constructed without or with fewer supports. The construction will not affect normal traffic on the road or under the bridge, reducing the impact on the traffic and environment where the construction is located.

 

3. Economical and efficient: The balanced cantilever construction method can give full play to economic benefits, minimize costs, make full use of the construction space and site, operate efficiently, and accelerate the construction period.

 

4. Reliable high quality: long service life, construction safety and stability reach new heights, both prefabricated segments and cast-in-place stages  ensure high quality to maintain the long life cycle of bridges and other buildings. The structure is stable and safe.

 

5. Wide range of applications: The balanced cantilever method is not affected by bridge height, river depth, etc., has strong adaptability, is suitable for the construction of long-span progress bridges, and can meet the needs of various special bridge types, such as concrete cable-stayed bridges and reinforced concrete Construction of arch bridge.

There is no need for fixed lifting machinery  at the construction site, which can save space and equipment resources and provide more operable space for on-site construction.

 

6. It can ensure the overall stability and stress performance of the bridge, and improve the service life and safety performance of the bridge.
 Cantilever pouring construction is simple, the structure has good integrity, and the position can be continuously adjusted during construction. It is often used on bridges with a cross-border distance of more than 100 meters;

When building a prestressed concrete cantilever bridge by extending it section by section from both sides of the pier, in order to withstand the unbalanced moment that occurs during the construction process and ensure the stability of the structure during the construction process, measures need to be taken to make the No. 0 express on the top of the pier and the bridge pier temporary Consolidate and cut off when necessary to unconsolidate.

During the construction process, when a certain construction procedure is completed, the stress system of the bridge structure changes. During bridge construction, the impact of the stress system changes at each stage must be considered and comprehensive responses must be taken. Way. For example, the layout of the prestressed tendons within the beam changes.

 

 

During construction, attention should be paid to the influence of weather conditions and other external factors to avoid delaying the construction progress.

Performing segmented construction requires professional equipment and skilled labor for operation and operation.

The construction process requires precise coordination and planning to maintain balance and stability.

 

The balanced cantilever construction method has a wide range of applications and is now widely favored by construction projects. Only a professional team can promote the smooth delivery of construction projects. BGI can provide complete customized solutions for construction projects and a complete set of supporting equipment to provide customers with Satisfactory one-stop service. Let customers experience satisfactory solutions and professional and meticulous services.

 

In addition, along with the balanced cantilever construction method, necessary equipment for an efficient construction site includes: segment lifter, beam launcher, straddle carrier, girder transporter and other machinery. If you have any interest or needs in this area, please contact BGI directly! We will have professionals available to provide you with quotations and consultation services online at any time.