Direct Push Rigs Manufacturers,
Exporter & Suppliers
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Direct push
technology includes several types of drilling rigs and
drilling equipment which advances a drill string by
pushing or hammering without rotating the drill string.
This should perhaps not properly be called drilling,
however the same basic results (i.e. a borehole) are
achieved. Direct push rigs include both cone penetration
testing (CPT) rigs and direct push sampling rigs such as
a Geoprobe. Direct push rigs typically are limited to
drilling in unconsolidated soil materials and very soft
rock.
CPT rigs advance specialized testing equipment (such as
electronic cones), and soil samplers using large
hydraulic rams. Most CPT rigs are heavily ballasted (20
metric tons is typical) as a counter force against the
pushing force of the hydraulic rams which are often
rated up to 20kn. Alternatively, small, light CPT rigs
and offshore CPT rigs will use anchors such as
screwed-in ground anchors to create the reactive force.
In ideal conditions, CPT rigs can achieve production
rates of up to 250-300 meters per day.
Geoprobe rigs use hydraulic cylinders and a hydraulic
hammer in advancing a hollow core sampler to gather soil
and groundwater samples. The speed and depth of
penetration is largely dependent on the soil type, the
size of the sampler, and the weight and power the rig.
Direct push techniques are generally limited to shallow
soil sample recovery in unconsolidated soil materials.
The advantage of direct push technology is that in the
right soil type it can produce a large number of high
quality samples quickly and cheaply, generally from 50
to 75 meters per day. Rather than hammering, direct push
can also be combined with sonic (vibratory) methods to
increase drill efficiency |
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