What components need to be checked before using a mobile scaffold?
The component inspection of mobile scaffolding before use is a key link to ensure operational safety, which needs to cover core parts such as structural load-bearing, stable connection, and mobile function. The specific inspection contents are as follows:
1、 Basic and Mobile Components
Universal Wheel/Brake Device
Check whether the wheels are intact: whether there are cracks or wear on the wheel body (if the tread depth is ≤ 1mm, it needs to be replaced), whether the connection between the wheel hub and the bracket is loose, and whether the rotation is smooth (without jamming or abnormal noise).
Test brake function: After stepping on the brake, the wheels should be completely locked (pushing the frame by hand without displacement), and can rotate flexibly after release to avoid sliding during use due to brake failure.
Wheel axle lubrication: Check if the axle pin is rusted, and add a small amount of lubricating oil (such as sewing machine oil) to ensure that the rotation is not stuck.
Base and adjustment device
Adjustable base (if any): Whether the screw rod can extend and retract freely, whether the adjusting nut matches (without sliding wire), whether the base plate is flat (without deformation, with a contact area with the ground of ≥ 90%).
Overall stability: Push the frame to a level ground and observe if it tilts (measured with a level ruler, with a vertical deviation of ≤ 1/100 of the frame height). If it shakes, adjust the base to level it.
2、 Main structural components
Pole and crossbar
Appearance of steel pipe: Whether there is obvious bending (local bending ≤ 3mm/m, overall bending ≤ 1/200 rod length), cracks or welding defects (such as weld bead, virtual welding), and whether the corrosion depth exceeds 1/10 of the original wall thickness (measured with a vernier caliper).
Connection node:
Buckle type: Whether the buckle can tightly fasten the crossbar, whether the spring elasticity is normal (shaking the crossbar without looseness after fastening), and whether the locking pin is complete and can be inserted into place.
Pin type: Whether the pin matches the upright hole (without being too loose or too tight), the exposed length after insertion should be ≥ 10mm to prevent detachment.
Diagonal rods and supports
Whether the diagonal bars are complete: According to the specifications, a diagonal bar should be set every 2-3 steps (to enhance the overall stiffness), and the connection between it and the upright/horizontal bar should be checked for firmness (no loose screws, no broken welding points).
Is the angle reasonable: The angle between the diagonal pole and the ground should be between 45 ° -60 °. If the angle is too large or too small, the installation position needs to be readjusted.
3、 Homework platform components
Pedal board/pedal
Material inspection: Check whether the wooden scaffold board is decayed or cracked (scrapped when the crack length is greater than 10cm or the depth is greater than 1/3 of the board thickness); Whether the steel scaffold board is deformed or corroded (perforation or broken reinforcement needs to be replaced); Is the bamboo scaffold board securely tied (with no loose or broken wire).
Fixed situation: Whether the two ends of the scaffold board are fixed to the crossbar with galvanized iron wire or special buckles (at least 2 fixing points at each end), and the gap between the boards is ≤ 5cm (to prevent tools from falling).
Guardrails and toe boards
Guardrail height: The height of the guardrail at the top of the pole is ≥ 1.2m, the height of the middle protective fence (if any) is 0.6-0.8m, the diameter of the guardrail steel pipe is ≥ 48mm, and there is no looseness in the welding or connection points.
Toe board: Height ≥ 18cm, fixed on the inner side of the pole (without shaking), made of tough material (such as iron sheet thickness ≥ 0.5mm, wood thickness ≥ 2cm) to prevent material from falling off.
4、 Additional safety components
Ladder/Step Ladder
Whether the spacing between pedals is uniform (30-35cm), whether there are anti slip patterns on the surface of the pedals (repair welding or replacement is required if wear is severe), and whether the connection with the pole is firm (screws are not missing).
Two side handrails: height ≥ 90cm, continuous without breaks, no cracks at bends, ensuring stable grip when climbing up and down.
Safety net (if any)
Whether the net is intact: no holes or tears (holes with a diameter greater than 5cm need to be repaired or replaced), whether the binding points are firm (at least one binding point every 1m, and the knots are not loose).
Connection with the frame: The safety net should be tightly attached to the inside of the crossbar, with no sagging at the edge (sagging amount ≤ 10cm), to prevent personnel or materials from falling.
5、 Overall functional testing
Load Test (Simplified Version): Two people stand in the center of the highest scaffold board (about 200kg) at the same time, let it stand for 1 minute, and observe whether the frame has obvious sinking, abnormal noise or component deformation. If there is any abnormality, stop immediately.
Mobile test: Push the frame in an unloaded state to check whether it can move in a straight line (without deviation), whether the wheels turn flexibly when turning, and avoid tipping over during movement due to component jamming.
Precautions after inspection
If any problematic components are found, they should be immediately marked (such as hanging a "disabled" warning sign), and use with faults is prohibited. After repairing or replacing qualified components, they should be checked and confirmed again.
The inspection results need to be recorded in the "Pre use Inspection Form for Mobile Scaffolding", signed and archived by the inspector, and traced for responsibility.
By thoroughly inspecting the above components one by one, safety accidents such as collapse and sliding caused by structural defects can be effectively avoided, especially suitable for high-frequency use scenarios such as building decoration and equipment maintenance.
