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Fundamental
concepts
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There are different drilling systems; the first distinction to make is
between the spin drilling and the rotopercussion. The spin drilling is
worther than the rotopercussion because it is less destructive, more
silent and needs less energy to work, but it involves a certain
workman’s “sensitivity and experience” and the pure-advancement
services are slightly disavantageous. The choice between these two
possibilities depends on different elements.
If it is required a borehole or a core avoiding vibrations and powders,
it is necessary the spin drilling. Carried out this choice, it is
indispensable to know if it is required a simply borehole (non-coring
drilling and/or core boring) or if the purpose is the analysis of the
core (core boring drilling). There are many kind of spin drilling and
each of them has its own peculiarity: the execution speed, the
possibility to catch up determinate depths, the guaranty of the core
recuperation, the possibility of not contaminating the core with the
drilling fluid, etc..
Finally, for the optimisation of any drilling system, it is
indispensable to use the most suitable cutting tool for the equipments
and the conditions of the soil which is going to be drilled.
The following tables will be helpfull for the choice of the drilling
system and will provide you with informations about the main
characteristics of the available cutting tools.
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THE
NON-CORING DRILLING SYSTEM
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Denomination
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Characteristics
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Limits
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Selection chart
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Non-coring
drilling
(deepenings)
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ˇ Possibility
to reach high depths.
ˇ It
avoids problems connected with the production of the core: the
extractions and the wedgings of the battery during the drilling.
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ˇ It
is not as efficient as the core boring with hard materials (for exemple
those materials containing quartz).
ˇ It
does not permit the recuperation of the core (eventual analysis on the
drilled material can be done on the cuttings and advancement
parameters).
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ˇ Any
kind of drilling that does not require the production of core.
ˇ Boreholes
for tie rods in damaged buildings.
ˇ Boreholes
for injections of grouting or resins for soil consolidations.
ˇ Boreholes
for the passage of diamond threads.
ˇ Boreholes
for the introduction of explosifs.
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CORE BORING DRILLING SYSTEM
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Denomination
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Characteristics
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Limits
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Selection chart
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Thin wall
diamond bits
(deepenings)
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Thin cutting section 2/5 mm
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Standard diameters from 8 to 1500
mm.
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Possibility to chose between wet
or dry drilling.
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Cutting depth 500 mm (max 3/4 m
with extensions)
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No previewed systems for the
breaking and the extraction of the core.
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Drilling of concretes, asphalts,
tiles, floor tiles, any kind of masonries.
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Drilling of marbles, granites and
stone materials.
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Drilling of refractory materials.
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Boreholes for dowellings.
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Boreholes for the passage of
tubes and/or cables.
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Boreholes for controlled
demolitions.
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Withdrawal of samples for
laboratories.
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Continuous
Coring System
(deepenings)
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Cutting section 6/7 mm.
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Standard diameters from 20 to 300
mm.
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It avoids manoeuvres for the
extraction of the core.
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Possibility to chose between wet
or dry drilling.
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Cutting depth max 30 m according
to the diameter and the material to be drilled.
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The core is in contact with the
drilling fluid and with the drill rod in rotation.
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Boreholes for tie rods in damaged
walls.
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Boreholes for injections of
grouting or resins for soil consolidations.
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Boreholes for the analysis of the
core.
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Boreholes for the passage of
tubes and/or cables.
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Boreholes for the passage of
diamond threads and pulleys.
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Boreholes for the introduction of
explosifs.
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Boring
(deepenings)
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SIMPLE
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Strong for hard conditions of
work.
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Standard diameters from 46 to 146
mm
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The core is in contact with the
drilling fluid and with the drill rod in rotation.
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Necessity of effectuing
manoeuvres every 1.5 and 3 m to empty the core barrel.
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Borings at little-medium depths
in the geotechnical, geological and environmental sectors.
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DOUBLE and TRIPLE
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The core is not in contact with
the drilling fluid and with the external tube in rotation.
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Possibility of different varyings
for specific applications (T2, T6, T6S, D, etc..)
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Standard diameters from 46 to 146
mm.
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Necessity of effectuing
manoeuvres every 1.5 and 3 m to empty the core barrel.
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Borings at little-medium depths
in the geotechnical, geological, environmental and mining research
sectors.
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They are used when it is required
a high percentage of core recuperation.
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They are used when it is required
a not disturbed core.
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WIRE-LINE
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The core is not in contact with
the drilling fluid and with the external tube in rotation.
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Possibility of reaching hundreds
meters of depth.
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The core can be quickly
recuperated without any manoeuvre.
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The borehole is covered by
staffs, avoiding sliding down.
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Standard diameters from 47.7 to
146 mm.
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The workman needs a specific
preparation.
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High beginning investment.
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Feelers need to be properly
equipped.
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Borings at high depths in the
geotechnical, geological,environmental and mining research sectors.
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They are used when it is required
a high percentage of core recuperation.
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They are used when it is required
a not disturbed core.
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TOOLS
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Denomination
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Description
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Characteristics
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Selection chart
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CORMET
Hard metal tools
(deepenings)
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Tools with a
hard metal sharp, braze-welded on a steel support.
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Available in 3
qualities and geometries (prism, octagonal, small-plates, spherical
buttons, etc..)
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Suitable only
for tender or melted materials.
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CORPAX
PCD Tools
(polycristalline)
(deepenings)
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Tools with a PCD
sharp (polycrystalline) with a hard metal support for the
braze-welding.
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Available in
different qualities and geometries (cylinders, parallelepipeds etc..).
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Suitable for the
cutting of tender and medium-hard materials.
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CORSIN
PCD Tools
(deepenings)
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Tools with a PCD
sharp (polycrystalline)surface set
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Available in
different qualities and geometries (cubes, parallelepipeds etc..).
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Suitable for the
cutting of medium-hard materials.
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CORSET (WATER)
CORSET2(AIR)
Set Tools
(deepenings)
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Tools with
natural diamond sharps set on the cutting surface.
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Available in
different sizes (dimensions of the diamond) according to the
application.
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Suitable for the
cutting of tender and medium-hard materials; hard if not fractured.
They produce
cores with an optimal finishing degree
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CORDIM
Utensili
impregnati
(deepenings)
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Tools with
sharps composed by synthetic powder of diamond.
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Available in
different tipologies according to the application.
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Suitable for the
cutting of hard materials also in conditions of extreme fracturation..
They produce
cores with an optimal finishing degree
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