1. Reduce Wind Load on the Tower Crane (When Conditions Permit)
- Lower the Independent Height or Free-Standing Section: Reducing the height of the tower crane above the attachment point helps minimize wind damage, as the force of the typhoon is proportional to the square of the crane's independent height or free-standing section.
- Position Climbing Frame at the Lowest or Top Attachment Point**: Lower the climbing frame to the bottom or top attachment point, allowing the load-bearing plates to absorb wind loads. Retract the hydraulic cylinder and secure the frame with steel cables.
- Secure with Guy Wires: Attach guy wires in four directions from the base or top of the tower crane structure to enhance stability and prevent displacement during high winds.2. Inspect and Reinforce the Attachment Frame
- Check and Reinforce Strength: Examine the attachment frame’s structural integrity, strengthening components as necessary, including embedded parts, adjustment bolts, and support rods.
- Ensure Proper Installation of Support Rods: Verify that the internal support rods within the attachment frame are properly installed, especially for the top two attachment frames, ensuring sufficient stability.3. Secure All Connection Points Firmly
- Tighten Connectors: Confirm that all pins, high-strength bolts, and foundation bolts are securely fastened to maintain structural stability and prevent loosening in high winds.4. Ensure Unobstructed 360° Rotation of the Tower Crane
- Disconnect Main Power Cable from Control Cabinet: Detach the main power cable from the control cabinet to prevent cable twisting or breakage due to rotational stress.
- Install Wind Shields as Required: Follow the manual’s instructions for installing wind shields at specified locations on the jib or counter jib, depending on jib length, allowing the upper part of the tower crane to rotate freely with the wind.
- Unlock Wind-Vane Braking System: Confirm that the normally closed wind-vane brake is in the open position, enabling the crane to rotate a full 360° without restriction in response to wind direction.5. Adjust Hook Position
- Raise Hook to Highest Point: Secure the hook at approximately 10 meters radius and fix the main power cable to prevent excess swinging, which could cause damage or additional load in high winds.
These measures will help stabilize the tower crane, reduce wind load impact, and maintain safety during typhoon conditions.
