A 120-MT concrete beam is lifted from the floor by two tandem heavy lift cranes up to a target height of 7.5 meters.
To calculate the work done by the two tandem heavy lift cranes, we can use the equation:
Work = Force x Distance
First, we need to calculate the total force exerted by the cranes to lift the concrete beam. The force can be calculated using the weight of the beam:
Force = mass x gravity
Given:
Mass of concrete beam = 120 MT
Gravity = 9.8 m/s^2
Force = 120 MT x 9.8 m/s^2 = 1176 kN
Now, we can calculate the total work done by the cranes:
Work = Force x Distance
Given:
Distance = 7.5 meters
Work = 1176 kN x 7.5 meters = 8820 kNm (kilo Newton meters)
To determine the lifting capacity required by each crane, we need to consider the weight of the concrete beam and the target height it needs to be lifted.
First, let's calculate the total weight of the concrete beam in metric tons (MT). The given weight of the beam is 120 MT.
Next, we need to determine the lifting capacity required to raise the beam to the target height of 7.5 meters. To do this, we can use the formula:
Lifting Capacity (in MT) = Weight (in MT) × Height (in meters)
Using this formula, we can calculate the lifting capacity required for each crane:
Lifting Capacity for each crane = Total Weight of the Beam (in MT) × Target Height (in meters)
Lifting Capacity for each crane = 120 MT × 7.5 meters
Lifting Capacity for each crane = 900 MT
Therefore, each crane needs to have a lifting capacity of at least 900 metric tons to lift the 120-MT concrete beam up to a height of 7.5 meters.
To lift a 120-MT concrete beam from the floor using two tandem heavy lift cranes up to a target height of 7.5 meters, you can follow these steps:
1. Assess the lifting capacity of the cranes: Confirm that the combined lifting capacity of the two tandem heavy lift cranes is sufficient to handle the weight of the concrete beam. Ensure that the cranes are in good working condition and have the necessary load charts available.
2. Rigging and lifting plan: Develop a rigging and lifting plan, taking into consideration the weight and dimensions of the concrete beam, the crane configuration, and the distance to be lifted. Consult with a qualified engineer or a certified rigger to ensure the lifting plan is safe and effective.
3. Position the cranes: Place the two tandem heavy lift cranes in suitable positions, ensuring that they are stable and can operate safely. The cranes should be positioned to evenly distribute the load and provide adequate access for lifting.
4. Rigging and attaching the lifting slings: Use appropriate lifting slings, such as steel wire ropes or synthetic slings, to securely attach the concrete beam to the crane's hook. Ensure that the slings are positioned correctly to evenly distribute the load.
5. Communicate and coordinate: Establish clear communication between the crane operators, riggers, and any other personnel involved in the lifting operation. Use hand signals or radio communication to ensure everyone is synchronized and aware of the lifting sequence.
6. Pre-lift checks: Perform pre-lift checks to verify that all connections and rigging are secure and properly aligned. Confirm that the lifting equipment is functioning correctly and that the crane operators have clear visibility of the lifting area.
7. Monitor the load: During the lift, carefully monitor the load to ensure it remains stable and does not swing or tilt unexpectedly. Use tag lines or other control measures, if necessary, to maintain control over the load.
8. Lift the concrete beam: With coordinated efforts between the two cranes, begin lifting the concrete beam slowly and steadily. The crane operators should work in sync to maintain balance and control over the load. Keep a close eye on the load and make any necessary adjustments to ensure stability.
9. Raise to the target height: Continuously raise the concrete beam to the target height of 7.5 meters, ensuring that all movements are controlled and deliberate. Communicate with the crane operators to maintain smooth and synchronized lifting.
10. Secure the load: Once the concrete beam reaches the desired height, make sure it is securely positioned and stable before releasing the tension on the lifting slings. Follow proper procedures to lower and detach the slings, ensuring the safety of all personnel involved.
Remember, it is crucial to always prioritize safety during lifting operations of heavy loads. Consult with experienced professionals and follow all relevant regulations and guidelines to ensure a successful and safe lifting process.