3. Lattice Boom Truck Mounted Crane

Try these first

1. 1.

   What is the purpose of outriggers on a crane?

   Hint

   Think of what supports a structure.

2. 2.

   Define the 'operating radius' in the context of cranes.

   Hint

   Consider how far the load extends from the crane.

3. 3.

   What is the distance from the load line to the tipping axis referred to as?

   • U
   • R
   • X

   Hint

   Focus on the definitions we've just discussed.

4. 4.

   True or False: The safety margin for a crawler-mounted crane is 85% of the tipping load.

   • True
   • False

   Hint

   Review the safety guidelines.

5. 5.

   A truck-mounted lattice boom crane has an operational radius of 50 feet with a maximum lifting capacity of 80 tons. If the operational radius increases to 70 feet, what will happen to its lifting capacity? Discuss mathematically and conceptually.

   Hint

   Refer back to our discussion on operational radius and tipping stability.

6. 6.

   Given that a crane is rated for a maximum load of 100 tons on a level surface, calculate how this must change when operating on an uneven surface without outriggers. Provide a brief explanation.

   Hint

   Consider how ground stability affects lifting capacity.