Tower Crane Technical Glossary

This glossary covers essential terms and components used in the operation of tower cranes, helping you understand key technical aspects of these heavy-duty machines.

1. Boom: The long horizontal arm of the crane that extends out to lift and move loads.

2. Counterweights: Weights attached to the crane’s base or jib to balance the load and prevent tipping.

3. Jib: The horizontal arm of the crane that carries the load. It can be fixed or moveable.

4. Mast: The vertical part of the crane that provides the height and stability.

5. Slewing: The rotation of the crane’s upper section (jib and mast) around its base to move the load horizontally.

6. Winch: A motor-driven device used to raise and lower the load on the crane.

7. Hoist: The lifting mechanism, typically including a hook and rope, used to move the load vertically.

8. Cab: The operator’s control room, typically located at the top of the crane, where they manage crane functions.

9. Outriggers: Extendable legs on the base of the crane that provide additional stability by spreading the weight load.

10. Load Chart: A table that outlines the crane’s maximum lifting capacities at various radii and heights.

11. Radius: The distance from the centre of the crane to the load being lifted, often affecting the crane’s capacity.

12. Tower Crane Foundation: The base structure that supports the crane, anchored to the ground for stability.

13. Tower Crane Climbing Frame: A system used to increase the height of the crane as the building rises, enabling the crane to climb up as construction progresses.

14. Top-Slewing Crane: A type of crane where the rotating section (the jib) is located at the top of the mast, often used for high-rise construction.

15. Luffing Jib: A crane with a jib that can be raised or lowered to adjust the angle of the load, providing greater flexibility and reach.

16. Wind Speed Limit: The maximum wind speed at which the crane can safely operate.

17. Load Moment: The product of the weight of the load and its distance from the crane's pivot point, used to determine safe operating conditions.

18. Turntable: A rotating platform that allows the crane’s upper section (mast and jib) to rotate around the base.