Track-type tractor (=Bulldozer) is very popular machine in the landfill. TTT usually prepares the site by spreading the first waste layer because bottom layers of a new site can be damaged when real landfill compactor is used. During the normal landfill operation TTT is usually used for building access and haul roads and spreading cover soil. It can be also used as a feeding machine for landfill compactor by pushing and spreading waste during peak hours and when the waste needs to be pushed long distances.
TTT as a compactor
Track-type tractor can also be used as a “compactor” but then achieved compaction rate is essentially lower compared to a real landfill compactor. This is due to the fact that TTT´s ground contact area (=area of the tracks against ground) has been designed as large as possible in order to ensure the maximum traction and to keep the machine on the surface.
When TTT is used as a compactor, the landfill working method is in most cases so called open face method meaning that the waste is pushed over the landfill edge instead of working in the down slope. Down slope operation with TTT is practically impossible because the low ground clearance of the TTT makes the machine to stuck in the loose waste.
Common features of TTT:
- width of tracks 2 x 450 – 650 mm (loose area between tracks)
- ground contact area of the tracks 3,5 – 4,7 m2
- ground clearance 400 – 620 mm
Pros of TTT as landfill compactor :
Cons of TTT as landfill compactor:
Typical compaction ratios at MSW landfills
|Track-type tractor||500 - 700 kg/m3|
|Four wheel compactor||700 - 1000 kg/m3|
|Two drum compactor||800 - 1200 kg/m3|
The compaction rates shown above are depending on:
- weight of the machine
- content of the waste
- waste moisture
- operation method
- driver skills
Compaction rate related to landfill revenue and life time (annual waste amount 150 000 t)
landfill revenue EUR
time in years
time in years