Steel structure is made up of steel plate and section steel ect, such as girder, column and frame ect. They are assembled as a whole after they carried to construction site, such as workshop and bridge girder ect. Connection takes very important role in steel structure which can influence the installation of steel structure, economic index and function directly.

ZZHZ has many ways about connection of steel structure of gantry crane , which conform to safe and reliable principle, simple structure and convenient assembly.gantry crane (box girder)

  1. Welding

Welding is the most widely used at the present.

Advantage: the geometric figure has strong adaptability, saves material and doesn’t reduce the section; fabricates conveniently which can make the automatic operation come true; good tightness of connection and high stiffness of structure.

Disadvantage: high stiffness of connection can produce residual stress and deformation. And the low temperature can influence the welding line heavily.

2) Riveting

Advantage: transmission force is reliable, toughness and plastic is good. Resistance dynamic load is also excellent. Especially, it applies to the structure with heavy duty and direct bearing dynamic load.

Disadvantage: the structure and construction are very complex, the quantity of steel is very large, and the noise is very loud.

3) The common bolt connection

Advantage: Assembly is very convenient and the equipment is sample.

Disadvantage: when the precision of bolt is low, the shear is not easy. And when the precision of bolt is high, the fabrication and assembly are not easy.

4) High-strength bolt connection

Advantage: Toughness and plastic is good, and transmission force is very uniform; the connections of dynamic load structure and the structure which works in the low temperature are very reliable.

Disadvantage: The technology of treatment of friction surface is a little complex, and the price is high.

5) Pin Connection

Advantage: Transmission force is reliable, toughness and plastic is good. Resistance dynamic load is also excellent.

Disadvantage: The requirement of fabrication is very strict.