According to the relevant test materials, double row couplers type tubular scaffolding overall stability test and the result of calculation and analysis, the excluded from the change of the load factor, the main factors influencing the scaffolding buckling bearing capacity as follows:

(1) step distance (horizontal bar spacing). In other conditions, the change of step distance has great influence on the bearing capacity of scaffolds. The carrying capacity of the scaffold decreases with the stepping distance, and the step distance is from 1.2m goes up to 1. At 8m, the critical load will fall by 26-29%.

(2) vertical spacing of the wall poles. In other conditions, the vertical distance of the wall bar is 3.6m goes up to 7. At 2m, the critical load will fall by 28% to 33%.

(3) lateral support. The critical load that sets the lateral support ratio without transverse support will increase by more than 15%.

(4) degree of the scaffolding coupler. The fastening degree of the coupler is 40N squared m - 5oN squared m. When the fastening degree of the scaffolding coupler is reduced, the anti-slip stiffness of the scaffold is reduced accordingly. When the fastening torque of the scaffolding coupler is 30N squared m, it will be 20% lower than the critical load of 50N squared m. However, when it reaches 50N squared m, it increases the fastening strength of the coupler, and the carrying capacity of the scaffold increases very little. This means that after the fastening degree reaches a certain value, the effect of increasing the lateral stiffness is very small.

(5) longitudinal support (scissors strut). The vertical support can be increased by more than 12 %. This is because after the vertical support, the space stiffness of the scaffold has been enhanced to enhance the stability of the scaffold.