Prefabricated box girder construction process and construction preparation

The box girder is a kind of bridge beam in the bridge project. The interior is hollow, with flanges on both sides of the upper part, similar to boxes, hence the name. Single box, multiple boxes and so on. The following small series introduces the prefabricated box girder construction process and construction preparation.

Prefabricated box girder construction process flow:

The quality of the bottom plate is the key point of the construction of the box girder. In order to ensure the construction quality of the bottom plate, we analyzed two kinds of technological processes.

A technological process is: beam steel production → Strand tension → stand side mold → casting floor → placing the inner mold → top plate, wing steel production → pouring web, roof → health → remove the mold → release → Keep the beam.

This process is easy to ensure the compactness of the floor, but requires many construction workers, long working hours and close cooperation. If there is a problem in one of the links, the quality of the project will be affected. In particular, the casting interval between the bottom plate and the web and the wing plate is long, and it is easy to produce significant construction joints.

The other is a molding process, the flow of which is: beam steel production → steel strand tension → stand side mold → placed inside the mold → roof, wing steel production → pouring floor, web, roof → health → demolition Die → release → save the beam.

In this process, the bottom plate is poured from the bottom of the web after the reinforcing bar and the formwork are all completed. Since the soleplate thickness is only 18cm, two layers of steel strands and body-beam reinforcements are distributed, which has a great retarding effect on the flow of concrete. To prevent the boards from swelling, the inner molds are wrapped in plastic sheets. If the ash is thrown from both sides, voids may easily form on the floor due to poor exhaust. Even if there is no void, it is difficult to ensure that it is compact and dense.

Prefabricated box girder construction preparation:

1. Technical preparations Carefully organize and implement the construction technicians and quality management personnel related to the project, and be familiar with the drawings, read the tender content carefully, and all the rules and reference standards of the owner. Pre-combed and grasp the various stages involved in the prefabrication construction of the box girder. , Acceptance of beam pedestal and steel formwork.

2. Materials such as gravel, sand, cement, steel bar, steel strand, anchorage, etc. required for prefabrication of box girders have been put into the market, and the quantity meets the requirements for start-up. Wherever there is an experimental test requirement, it has been carried out before entering the market. The experiment can only be purchased to the construction site with the agreement of the supervision engineer.

3. Personnel preparation The project management personnel shall set up posts, carry out quotas and posts according to relevant requirements, and the labor force shall be equipped according to the needs of the construction. The ideological education and pre-job training shall be conducted for all personnel participating in the construction of the project, and special types of work shall be implemented. With certificates, all managers and employees participating in the construction work are unified in thoughts, step by step, and their responsibilities and responsibilities are fully fulfilled. This ensures that the project can be successfully completed on time, with high quality and with high efficiency.

Xiao Bian concludes: The above introduced the preparation process flow and construction preparation of the prefabricated box girder, and we hope to help everyone. For more relevant knowledge, please continue to pay attention to this website information platform. Follow-up will bring more exciting content for everyone.

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