Reinforcement Scheme Of Bridge Crane Bridge

Reinforcement Scheme of Bridge Crane Bridge
 

The metal structure of the bridge crane is the skeleton of the crane, and all mechanical and electrical equipment are distributed on it, which is the load-bearing structure of the crane and makes the crane a mechanical device as a whole.
 

The metal structure of the 20 ton bridge crane is mainly composed of crane bridge (also known as cart bridge), trolley frame and driver's cab.
 

Due to the needs of steelmaking production, the bridge crane is in the state of frequent lifting with full load for a long time, which will cause serious problems such as downward deflection and side bending of the bridge frame of the crane, which greatly shortens the service life of the bridge frame, and is not conducive to the safe operation of the crane. .
 

Therefore, it is necessary to strengthen the bridge crane bridge to improve the bearing capacity and safety factor of the bridge. The following is a reinforcement plan for the bridge:

Taking the common box-type bridge crane as an example, if the bridge frame of the reinforced crane is a box-shaped regular rail beam bridge frame, improving the overall bearing capacity of the bridge frame is mainly aimed at the three parts of the main girder, the connecting weld between the main girder and the end girder, and the end girder. Reinforce the dangerous section, the scheme is as follows:

Reinforcement scheme for improving the bearing capacity of the main girder

Increasing the cross-sectional area of the main beam can increase the moment of inertia, thereby increasing the strength and stiffness of the main beam, which is a reliable and effective method to improve the bearing capacity of the main beam.
 

The most common ways to increase the cross-sectional area of the girder are as follows, and their respective characteristics are as follows:

(1) The increased cross-sectional area of welded small box girders is large, the increased mass of structural parts is large, the workload of structural parts is large, the construction is difficult, and the amount of welding is large. It is suitable for main cranes with large tonnage and large spans. Beam reinforcement.

(2) The increased cross-sectional area of welded channel steel reinforcement is smaller than that of the welded small box beam reinforcement method, and the amount of welding is large, but the weight of the added structural parts is lighter, the workload of structural parts is small, and the construction difficulty is small. It is suitable for larger Reinforcement of the main girder of a crane with a large tonnage and a small span.

(3) The increased cross-sectional area of the prestressing method is equivalent to that of the welding small box beam reinforcement method. The amount of welding is small, the weight of the added structural parts is light, the workload of structural parts is small, and the construction difficulty is small. It is suitable for small-tonnage cranes The main beam is reinforced.