How to set up the wall connecting components for mobile scaffolding?
The wall connecting components of mobile scaffolding are the core components that ensure the stability of the scaffolding, effectively resisting horizontal forces such as wind loads and operational impacts, and preventing the scaffolding from overturning or deforming. The setting should follow the principle of "rigid connection, uniform distribution, and nearby anchoring", and the specific specifications are as follows:
1、 Basic requirements for wall connecting components
Connection method: Rigid wall connectors must be used (flexible materials such as steel wire ropes, lead wires, etc. are prohibited). Common forms include:
Steel pipe fastener type: Use right angle fasteners to connect the frame uprights with wall penetrating steel pipes (fixed through the wall);
Pre embedded part type: U-shaped bolts are pre embedded in the wall and fixed to the frame uprights through the connecting ear plates of the bolts;
Adjustable: Composed of flower basket bolts, steel pipes, and hooks, the tightness can be fine tuned to adapt to different wall thicknesses.
Material requirements: The steel pipe of the wall connecting component must be consistent with the material of the main frame of the scaffold (Q235 steel, diameter ≥ 48mm, wall thickness ≥ 3.2mm), with bolt strength grade ≥ 8.8, ensuring a bearing capacity of not less than 10kN (pull-out resistance) and 8kN (shear resistance).
2、 Set spacing and position
Vertical spacing: Along the height direction of the frame, the spacing between wall connecting components should be ≤ 4m (i.e., 1 horizontal bar should be set every 2 steps, while for conventional horizontal bars with a step spacing of 1.5m, approximately 1 horizontal bar should be set every 3 steps). If the height of the frame exceeds 24m, the vertical spacing should be reduced to ≤ 3m to enhance the anti overturning ability.
Horizontal spacing: Along the length direction of the frame, the single row frame should be ≤ 3m, and the double row frame should be ≤ 6m (or according to the principle of "two steps and three spans", that is, one line should be set every three horizontal poles). At narrow spaces or irregular structures, the horizontal spacing can be adjusted appropriately, but the maximum should not exceed 8m.
Location selection:
Prioritize setting at the node between the vertical pole and the horizontal pole (distance from the node ≤ 30cm), utilizing the rigidity of the node to distribute the force;
Avoid weak areas such as door and window openings, pipelines, etc. If it is necessary to set them near the opening, one wall connecting piece should be installed on each side of the opening, with a spacing of ≤ 2m;
Within a range of 3 meters on both sides of the high and low sections of the scaffold, one wall connecting piece must be installed.
3、 Specification for Setting up Special Scenarios
No walls or elevated areas:
Surrounding fixed structures (such as concrete columns and steel structure supports) can be used to set up wall connecting components, using column support (enclosing the column with steel pipes and bolted to the frame);
If there is no anchorage structure, temporary bracing (slant support with an angle of 45 ° -60 ° to the ground) shall be set for auxiliary fixation, with the spacing of bracing ≤ 6m, and it shall be removed after the installation of wall fasteners.
Special requirements for mobile scaffolding:
Mobile scaffolding must be equipped with wall connectors when in fixed use (non mobile state), and the wall connectors must be removed before moving, and reinstalled after being moved in place;
Mobile scaffolding with a height exceeding 6 meters must have wall connecting components installed in both directions (connected horizontally and vertically) to form a stable triangular load-bearing system.
4、 Acceptance and maintenance
Post installation inspection:
Use a torque wrench to test the bolt torque (40-65N · m) to ensure a tight connection;
Check whether the contact between the wall connecting components and the frame or wall is tight, without looseness or gaps (adjustable with iron pads);
Simulated horizontal force test: Use a 100N force to push the frame horizontally, and a displacement of ≤ 10mm is considered qualified.
Regular maintenance:
Check the wall connecting components once a week for rust and deformation, and replace them immediately if any problems are found;
In case of strong wind and rainstorm, it is necessary to recheck the anchoring strength of wall fasteners to prevent the wall from loosening and causing connection failure.
Attention: Wall connecting components are the "lifeline" of scaffold safety, and unauthorized removal or reduction of quantity is strictly prohibited. If temporary dismantling is required during homework (such as wall construction), temporary supports must be set up first and restored within 24 hours, and the dismantling of each connecting wall component must be approved by the on-site safety officer.
