What is the box girder prefabricated water film iron sheet process

Fifth, the main construction machinery and equipment of the main machinery and equipment prefabrication plant name model quantity concrete tanker 8m3 2 post-tensioned prestressed concrete prestressed box girder construction technology block diagram see the attached drawing. Fabrication and installation of steel bars of raw materials.

1. The position of the embedded steel plate at the end, the vertical and horizontal slope.

2. If there is a middle diaphragm, the installation and location of the steel bar.

3. Prestressed pipeline coordinates and positioning ribs.

4. Installation of reinforcement at the anchor end.

5. Inner membrane installation and anti-floating measures.

6. Top plate brushing.

7. Sprinkling cover maintenance.

8. Prestressed tension construction.

9. Grouting and anchoring.

The box girder of the reinforced concrete structure is divided into prefabricated box girder and cast-in-place box girder.

The prefabricated box girder combined bridge erecting machine in an independent site can be erected after the completion of the lower project, which can accelerate the progress of the project and save the construction period; Cast-in-place box girders are mostly used for large continuous bridges. At present, there are two main kinds of common materials, one is the prestressed reinforced concrete box girder, and the other is the steel box girder. Wherein, the prestressed reinforced concrete box girder is on-site construction, and in addition to longitudinal prestress, some are also provided with transverse prestress; The steel box girder is generally processed in the factory and then transported to the site for installation, with all-steel structure and some reinforced concrete pavement layer.

In the prefabricated construction of box girders, it is necessary to pay attention to:

1. The position of the embedded steel plate at the end, the vertical and horizontal slope.

2. If there is a middle diaphragm, the installation and location of the steel bar.

3. Prestressed pipeline coordinates and positioning ribs.

4. Installation of reinforcement at the anchor end.

5. Inner membrane installation and anti-floating measures.

6. Top plate brushing.

7. Sprinkling cover maintenance.

8. Prestressed tension construction.

9. Grouting and anchoring.

In the prefabricated construction of box girders, it is necessary to pay attention to:

1. The position of the embedded steel plate at the end, the vertical and horizontal slope.

2. If there is a middle diaphragm, the installation and location of the steel bar.

3. Prestressed pipeline coordinates and positioning ribs.

4. Installation of reinforcement at the anchor end.

5. Inner membrane installation and anti-floating measures.

6. Top plate brushing.

7. Sprinkling cover maintenance.

8. Prestressed tension construction.

9. Grouting and anchoring.

You are talking about cast-in-situ concrete prestressed box girder, cast-in-place generally use the bracket method, let me tell you about its main construction process: construction preparation foundation treatment bracket position pay-off bracket erection bracket verification adjustment laying vertical and horizontal timber installation support installation bottom template, side template bottom template leveling bracket preload bracket and bottom mold adjustment binding bottom plate, side plate reinforcement installation bellows installation inner template installation end template binding roof reinforcement self-inspection, inspection concrete pouring concrete curing dismantling side formwork and inner formwork prestressed tension grouting, Plugging end maintenance Removal of bottom template and bracket Bridge deck pavement waterproof layer and protective layer Bridge deck system installation. Hope to adopt.

Prefabricated partially prestressed concrete continuous box girder, often called composite box girder, is a kind of first simply supported and then continuous partial prestressed concrete structure. It has the characteristics of large torsional stiffness, good transverse distribution, high bearing capacity, small structural weight, steel saving, good transportation and hoisting stability, etc., and has been widely used in traffic engineering construction.

The section is prefabricated in the factory, and then hoisted and spliced, tensioned and prestressed to form a whole, and finally a continuous box girder is formed.

It can be simply understood as a beam that is hoisted after the factory is processed and manufactured according to the construction drawings or specification atlas, and the strength reaches a certain level.

Box girder, a kind of beam in bridge engineering, is hollow inside, and there are flanges on both sides of the upper part, similar to a box, hence the name. Divided into single boxes, multiple boxes, etc. The box girder of the reinforced concrete structure is divided into prefabricated box girder and cast-in-place box girder.

The middle of the beam is empty, which is called the beam chamber, and the plug plate is used to seal the beam chamber.

After the box girder is stretched, the template installed at the end of the box girder is called the plug plate, and the concrete is poured for end sealing construction after the installation is completed.

Now the simply supported small box girder bridge is more common in the urban bridge, because the prefabrication, construction, hoisting are convenient, many design institutes are using, but the height of the small box girder bridge is relatively short, how to take out the inner membrane in the prefabrication process needs to be considered by the designer, now the usual practice one: it is the small box girder roof slotted to facilitate the removal of the inner membrane, and then the notch reinforcement and closure are finally complete.