The box column beam is a beam composed of two steel plates and other parts, which is delimited by the symmetry axis or the joint of different shapes, and is installed and welded in the hoisting sequence. It is often used in steel structure construction projects like H-shaped steel, usually used in steel structure workshops and bridge construction, and is used as a column or main beam in steel structure projects. Compared with the concrete and wooden column beam has the advantages of large carrying capacity, light weight, good stability and stiffness, convenient construction and transportation, and has been widely used in various bridge construction, such as highway Bridges, railway Bridges, cable-stayed Bridges, etc., box beam looks like a large iron box from the appearance, so as the name suggests, it is called "box column beam".

 Steel structure box column and beam is a common form of steel structure, mainly composed of box column and box beam. They are usually welded from steel plates and have high strength and rigidity, which can be used in a variety of building and industrial structures. 

Box columns are welded from rectangular steel plates closed on all sides, and have greater load capacity and lower weight than traditional square or round columns. The box beam is also welded from rectangular steel plates, and its section shape is rectangular, which is more compact than the traditional I-beam, and can reduce the height of the structure.

 Steel structure box column and beam have the following advantages:

 1, high strength and rigidity, can withstand large loads and shear.

 2, the structure is light, can reduce the size and weight of the foundation.

 3, convenient construction, can be prefabricated in the factory, on-site assembly.

 4, can use a variety of connection methods, such as welding, bolt connection, etc.

 5, with good fire resistance and seismic performance.