What are the common problems with scaffolding?

Have a clear understanding of heavy scaffolding. If the floor thickness exceeds 300mm, we should change our thinking and design according to heavy scaffolding. If the scaffold load exceeds 15KN/㎡, experts shall be organized to demonstrate the design scheme. The sweeping bar is missing, the vertical and horizontal junctions are not connected, and the distance between the sweeping bar and the ground is too large or too small; When the scaffold board is cracked and the thickness is not enough, it is necessary to distinguish which parts of the steel pipe have great influence on the bearing capacity. Regarding formwork support, it should be considered that the length a between the center line of the top horizontal bar and the formwork support point should not be too long, generally less than 400 mm When calculating the vertical bar, the top step and the bottom step are the most stressed, which is the main calculation point.

When the bearing capacity does not meet the requirements of the group, vertical poles should be added to reduce the vertical and horizontal spacing, or horizontal poles should be added to reduce the step distance. The quality of steel pipes, fasteners, top bracing and bottom bracing of scaffolding in China is generally unqualified, which is not considered in theoretical calculation in actual construction. It is best to take a certain safety factor in the design and calculation process. The construction sweeping rod is missing, the vertical and horizontal junctions are not connected, and the distance between the sweeping rod and the ground is too large or too small; The scaffold board is cracked, the thickness is not enough, and the lap joint does not meet the standard requirements; After the large formwork is removed, there is no anti-falling net between the inner column and the wall; The support is discontinuous in the plane; Open scaffolding has no diagonal braces; The small bar spacing under the scaffold is too large; Even the wall part is not rigidly connected inside and outside; The distance between protective railings is greater than 600mm；; Fasteners are not tightly connected, and fasteners slip. Local deformation of scaffolding caused by foundation settlement. On the cross section of the double bent frame, a figure of eight or bracing is arranged, and a group of vertical rods are arranged every other row until the deformation zone is discharged. The splay or scissors must be placed on a solid foundation.

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