The triangular structure between the wing plate and the rib plate of the T-beam is called the negative moment toothed plate, and then the beam is placed on the deck due to the tension of the composite bridge.

The function of tooth plate of bridge box girder is the same as that of T-beam negative moment tensioning groove, that is, it is used for negative moment tensioning, which makes the simply supported beam become a whole after negative moment tensioning and disperses the load of the bridge.

Toothed plate is used for prestress tension in negative bending moment area. At the position below the two side plates in the negative bending moment area of the continuous end, there is no negative bending moment tension at the simply supported end, and naturally there is no toothed plate. If the two ends of the T-beam are continuous, there are four toothed plates (one at the bottom of the left and right wing plates in the negative bending moment area at both ends), and one end is simply supported and the other end is continuous (only at the bottom of two side plates in the negative bending moment area).

Extended data:

Precast beam construction matters needing attention:

1. Read the general plan of precast beam carefully, paying special attention to the layout of prestressed pipes, the installation of anchor pads and anchorages, the layout of steel bars at the tensioning end, the layout of steel bars outside the curve, and the layout of steel bars at the negative bending moment of toothed plates.

2. The curve line type of the outer beam or the inner beam should be carefully checked to ensure that the line type is symmetrical and beautiful. The plane position of the pre-embedded reinforcement of the crash barrier should be slightly embedded inside, and the line type should be smooth.

3. The order of formwork removal is opposite to that of formwork installation. Pay attention to handle with care, do not touch the beam, and ensure that the beam is not short of edges and corners.

4, pay special attention to the angle of the anchor plate, must be parallel to the prestressed pipe section, avoid by all means have an angle, steel strand welding, it is forbidden to burn. Only the cutting machine can be used for blanking. When blanking, both sides of the cutting machine are wrapped with wet cloth to prevent the steel strand from being burned.

Baidu encyclopedia-box girder

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