These
versatile equipments are commonly used in construction projects. It is
essentially a heavy steel blade which is mounted on the front of a
tractor. The tractor can be of the crawler or the wheel type. The heavy
blade attached to the tractors pushes the material from one place to
another. Bull dozers are classified on the basis of:
(A). Position of Blades:
- Bull dozers with blades perpendicular to the direction of movement.
- Angle dozers in which the blade is set at an angle with the direction of movement
(B). Based on Mountings:
- Wheel mounted
- Crawler mounted
(C). Based on the Control:
- Cable controlled
- Hydraulically controlled
The
earth moving bull dozer consist of a heavy blade of somewhat concave
profile. The blade is attached to the body of the tractor with two arms
and a supporting frame. The blade is held at the lower edge on the two
heavily built push arms which are hinged to the track frame of the
tractor. The top of the blade is supported by two brace arms attached to
the push arms. The blade is projecting ahead at the bottom.
Application-
Bull dozer are mainly used for the following operations-
- For spreading the earth fill
- For opening up pilot roads through mountainous and rocky terrains
- Clearing construction sites
- Maintaining haul roads
- Clearing land from the trees and stumps
- Back filling trenches at construction sites by dragging the earth from one place to another
