Distinguish by the material of the rod

① A rack pipe made of a single specification steel pipe: it uses steel pipes of the same specification

② A scaffold tube composed of multiple specifications of steel pipes: It is composed of two or more different specifications of steel pipes combined

③ Scaffolding mainly composed of steel pipes: Its meaning can be understood as a scaffold mainly composed of steel pipes and supplemented by other types of steel members

(For example: scaffolding with a base or scaffolding with channel steel top support and scaffolding with connected fixed steel plates)

Distinguish based on the vertical force between the upright pole and the horizontal pole

① Relying on the friction between the scaffold and the ground to transmit force: it can be understood as using the reaction force generated by the friction and compression of the scaffold nodes when they are in contact with the ground to support the load of the crossbar and then transmit it to the upright

② Relying on welding seam to transmit force: can be understood as the use of socket joints between horizontal bars and vertical bars), for example, a gantry is constructed in this way.

③ Relying on direct pressure transmission force: mostly seen in the transmission force that is dry and placed at the top of the pole

④ Relying on the anti shear force transmission of the pin rod: that is, using a shear rod to pass through the vertical hole of the horizontal bar and the hole of the vertical bar to complete and achieve the connection