Why should the scaffolding wall tie be set within 300mm from the main node

The scaffolding wall tie has two main functions:
The first is to resist the horizontal force generated by the wind on the scaffolding and transfer it to the structure.
The second is to serve as an intermediate constraint of the frame to reduce the calculated length of the vertical pole.
Through the study of scaffolding, it is found that its failure form is mainly overall lateral instability failure. Under this form of failure, the scaffolding has a large wave bulging phenomenon in the direction perpendicular to the building, and the wavelength is related to the spacing of the wall tie. Therefore, setting the wall tie near the main node can effectively prevent overall lateral instability. If it is set in the middle of the vertical pole, due to the poor bending stiffness of the vertical pole, the constraint effect will be greatly reduced. Therefore, we can see that when calculating the wall tie, a 3KN horizontal force must be superimposed. Why should the scaffolding wall tie be set within 300mm from the main node? This is the reason.

So what is the main node? Here is the simplest judgment method. The node with rods in three directions (horizontal, vertical, and vertical) is the main node.

Furthermore, the precise consideration of setting the wall ties within 300mm from the main node also contains the wisdom of structural mechanics. As the core intersection of the scaffolding structure, the stability and strength of the connection of the main node directly affect the integrity and bearing capacity of the entire scaffolding system. By arranging the wall ties closely around the main node, the restraining effect of the wall ties can be maximized, so that when the scaffolding encounters wind loads or other lateral forces, these external forces can be quickly and effectively dispersed and transmitted to the building structure, thereby avoiding damage caused by local stress concentration.

In addition, the 300mm distance setting is the result of practical verification combined with theoretical calculations. It not only ensures that the wall ties can effectively restrain the lateral deformation of the scaffolding, but also avoids construction difficulties or material waste that may be caused by too close distance. Within this distance range, the wall ties can not only play the best reinforcement effect, but also maintain the flexibility of construction operations, ensuring the efficiency and safety of scaffolding erection.

In summary, the setting of scaffolding wall parts within 300mm from the main node is based on comprehensive considerations of structural safety, mechanical principles, and construction practice. It is not only an important measure to ensure the stability of the scaffolding and prevent overall lateral instability, but also a key link to improve the quality and safety of scaffolding construction. In actual projects, strict compliance with this specification is of great significance to ensuring the safety of construction personnel and improving project quality.