The kangaroo type compactor (also know as rammer or vertical, percussion or jumping type tamper) is a powerful vibratory impact tool powered by a combustion engine. It can apply tremendous force to the soil surface in consecutive impacts, evenly leveling and packing the void spaces between soil particles to raise its dry density, that is, the weight of solid soil particles per unit volume.
The compactor It is designed for use in confined areas and is particularly useful in compacting gravel, cohesive clay, and granular soils to prevent settlement and provide a firm, solid base for the placement of footings, concrete slabs, and foundations. It is also used in patching over asphalt and backfilling open trenches for gas pipelines, aqueducts and cable installation.
Essential parts that make up a compactor or rammer
Operation of a rammer – kangaroo type compactor
The power source of a compactor it is the air-cooled engine that, depending on the model, can be fueled with gasoline or diesel. Power transmission is achieved by increasing engine speed to engage the clutch or bag centrifugal and then substantially reduced by means of gears, whereby rotational motion becomes reciprocal (vertical) motion. A high-strength, lubricated spring (or system of springs) is located in the part of the tool where the up and down motion occurs, so its force and the weight of the rammer combine to develop a powerful compaction force on the footing.
Characteristics of the rammer or compactor
The compactor It is a manual tool that works in a vertical position. The characteristics of each compactor They vary widely depending on the model, but in general the machine weighs between 65 and 80 kg, is approximately 1 meter high and generates between 500 and 800 impacts per minute, with an impact force that ranges between 1 and 1.5 tons. It typically shows a forward speed of 10-15m per minute and is capable of compacting an area of 140-280mtwo per hour. The dimensions of the shoe make up a rectangle of about 25 x 35 cm, although there are also square shapes.
There are models of compactors environmentally friendly that not only provide great vibration isolation, but also mufflers or low-noise 4-stroke engines that eliminate the need for 2-stroke gasoline and oil mixtures .
Care and precautions in the use of rammers and compactors
Proper operation and servicing is essential for optimum performance of this tool, therefore all instructions in the user manual must be followed. In addition, since it is a machine that emits high levels of vibration, the operator must also take precautions to protect his health.
To extend the life of the kangaroo rammer or compactor
- Keep all filters (air, oil and fuel) on the tool clean.
- Always use superior grade fuel and oil.
- Check the correct lubrication of the spring(s) before use, inspecting the oil level through the corresponding sight glass.
- Renew the oil, according to the manufacturer’s instructions.
- Empty the fuel and oil tanks when the machine is transported to distant places or when it is not used for a long time.
- Operate the machine in an upright position and hold it firmly by the handlebars with both hands.
- Make sure that the footing always hits parallel to the ground.
- Wear gloves to keep your hands warm and reduce the effect of vibrations. These cause serious problems in the bones, joints, muscles, circulation, and nervous system. For this type of tool, the use of anti-vibration gloves is highly recommended.
What should never be done
- Increase engine speed above recommended speed. Not only will this not improve the effectiveness of the compactor, but the impact will be less, because instead of creating an effect compactor a resonance is originated, with the consequent damage to the unit.
- Use the tool on sloping ground, where it may become unbalanced, for example on foundations on piles or steep banks, or on firm ground such as asphalt or concrete.
- Work in closed or poorly ventilated places. Not only does this condition cause engine damage, but combustion gives off carbon monoxide, which is a deadly gas.
Video of operation of a compactor