What are the operating requirements for construction tower cranes?

What are the operating procedures for tower cranes in construction? Below, Zhongda Consulting will give you a detailed introduction.

1. Before crane operation, check that the track foundation is straight and without subsidence, and that the fishplate connecting bolts and spikes are not loose. Obstacles on the track should be removed, and the rail clamp should be loosened and fixed upward. good.

2. Key inspection items before starting should meet the following requirements:

1) The appearance of the metal structure and working mechanism is normal;

2) Each safety device and all indicating instruments are complete and intact;

3) The oil levels of each gear box and hydraulic oil tank meet the regulations;

4) The connecting bolts of the main parts are not loose;

5) The wear of the steel rope and the winding of each pulley comply with the regulations;

6) The power supply cable is not damaged.

3. Before powering on, the handles of each controller should be in the zero position. When the power is turned on, a test pen should be used to check the metal structure part, and only after confirming that there is no leakage, can the machine be put on.

4. Before operation, no-load operation should be carried out to test whether each working mechanism is operating normally, whether there is any noise and abnormal noise, and whether the brakes and safety protection devices of each mechanism are effective. Operation can only be carried out after confirming that they are normal.

5. When lifting heavy objects, the total weight of the heavy object and the spreader shall not exceed the specified lifting capacity of the crane's corresponding range.

6. The appropriate working speed should be selected according to the lifting weight and the site conditions. When operating each controller, start from the stopping point (zero point) and gradually increase the speed. Over-blocking operations are strictly prohibited. When changing the running direction, the controller handle should be moved to the zero position, and then turned to the other direction after the motor stops. Direct changing of the running direction, sudden speed change or braking is not allowed.

7. Before the hook is lifted, the lifting trolley or the traveling trolley reaches the limit device, it should slow down to the stop position and keep a certain distance from the limit device (the hook must not Less than 1m, the running wheel shall not be less than 2m). It is strictly prohibited to use a limit device as a control switch to stop operation.

8. The lifting, turning and walking of the luffing jib crane can be carried out at the same time, but the luffing should be carried out separately. The luffing parts should be inspected after each amplitude change. Amplitude variation with load is allowed, but when the load reaches more than 90% of the rated lifting capacity, amplitude variation is strictly prohibited.

9. When lifting heavy objects, free descent is strictly prohibited. When the heavy object is in place, a slow positioning mechanism can be used or the brake can be used to lower it slowly.

10. When lifting heavy objects for horizontal movement, they should be at least 0.5m higher than the obstacles they cross.

11. For cranes without a central collector ring hoisting mechanism that is not installed in the slewing part, continuous rotation in one direction is not allowed during operation.

12. Cranes equipped with upper and lower control systems must not be used up and down at the same time.

13. During operation, when there is a power outage or voltage drop, the controller should be moved to zero position immediately and the power supply should be cut off. If there is a heavy object hanging on the hook, the brake should be slightly loosened and tightened repeatedly to make the heavy object slowly drop to a safe zone.

14. Cranes using eddy current braking speed regulation systems are not allowed to operate at low speed or at slow positioning speed for a long time.

15. If you encounter strong winds or gusts of level 6 or above during operation, you should stop the operation immediately, lock the rail clamp, completely loosen the brake of the slewing mechanism, and the boom should be able to rotate with the wind. For light luffing cranes, the boom should be lowered and locked with the tower structure.

16. During operation, when the operator temporarily leaves the control room, the power supply must be cut off and the rail clamping device must be locked.

17. It is strictly forbidden to overcrowd the special elevator for carrying people in the crane, and its rope breaking protection device must be reliable. When the crane is operating, it is strictly prohibited to operate the elevator. When the elevator is out of service, it should be lowered to the bottom of the tower and should not be suspended in the air for a long time.

18. After the operation is completed, the crane should be parked in the middle of the track, the boom should be turned to the downwind direction, and the slewing brake should be released. The trolley and counterweight should be placed in a non-working state, and the hook should be The height is 2~3m away from the top of the boom.

19. When stopping, each controller should be returned to the zero position, each switch should be turned off in turn, and the doors and windows of the control room should be closed. After getting off the machine, the rail clamp should be locked to fix the crane to the track. , turn off the main power switch and turn on the altitude indicator light.

20. Maintenance personnel must fasten their seat belts when inspecting or repairing high-altitude parts such as towers, booms, and balance arms.

21. In the cold season, the motor, electrical cabinet, rheostat box, brake, etc. of the crane that is out of service should be tightly covered.

22. For luffing jib and unattached self-elevating tower cranes, placards are not allowed to be hung on the tower body.

For more information about engineering/service/purchasing tender document writing and production to improve the bid winning rate, you can click on the official website customer service at the bottom for free consultation: /#/?source=bdzd