The main body of the Jumbo has two or a maximum of three drilling rigs, a basket, and a movable roof that moves vertically, and four jacks are installed in its four corners to stabilize it during drilling and prevent it from changing the drilling angle. Its movement system is carried out by two axles with rubber wheels.
The rigs include rails and a motor to move the hammer. The hammers operate hydraulically and drill with continuous rotation and blows, and high-pressure water is used to remove the soil from the excavation. The length of the rig varies and is about 3.5 meters.
A basket rig is installed on a rig to access the drilled holes, measure them, and set the cost for explosion.
All drilling systems, including the hammer, movement motors, and jacks used in the Jumbo Drill, operate hydraulically. To perform this operation, hydraulic pumps are used, the number of which varies depending on the dimensions and number of rigs of the machine. In jumbo drills, the driving force of the hydraulic pumps is provided by electric motors and diesel engines. An operator is required for each rig to guide the machine and drill with it.
For tunnels with a high percentage of collapse, the explosive drilling method with this machine is not suitable and rotary machines are used instead.
