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Solutions and tools for overburden drilling

THE POWER TO CUT THROUGH

CONSTRUCTION.SANDVIK.COM

OVERBURDENDRILLINGDrilling through overburden is always a challenging task. Ground conditions can vary greatly, and sensitive handling is often needed, especially on sites where there are existing foundations.

A key to success is having tools that can eliminate over-drilling, thus preventing settlement and damage to nearby buildings and structures. Air control is critical. You need sufficient air pressure, but it must be mastered effectively.

SANDVIK CENTREX PRO

RETRIEVABLE RING BIT SYSTEM

Our overburden drilling system, Sandvik Centrex Pro, answers the challenges of drilling through difficult materials in sensitive terrain. It delivers outstanding performance in virtually any conditions, with unmatched air control, flushing and straightness control.

Zero or reduced risk of air

escape, especially in clay

Crosswise flushing with no

pressure against the ground

Back flush reduces risk of

getting stuck in the hole

and helps remove material

Guide centre minimizes

risk of hole deviation

Cutting edges for improved

drilling in hard clay

Slim design for

easy retrieval

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Double shoulders

for long service life

Large inner diameter

for maximum space for

installed elements

Integrated wear

resistant ring set

Zero or reduced risk of

over-drilling, especially

in sand

Zero or reduced disturbance

of marine deposits

For applications where the casing is retrieved and used several times, two main criteria must be met: a large ID and a strong structure. The sets are designed to last for hundreds of metres, even when hard rock formations are encountered. The system is designed so that the casing can always be pulled out after drilling. The large ID enables the use of maximum size rock socket and installed elements.

Main applications for multi-use retrievable system:

In situ piles (skin friction) where casing is fully retrieved

Anchoring applications

Pre-drilling/temporary casing applications

Energy/water wells where casing is fully removed

LARGE ID RING BIT SYSTEM

INTEGRATED THICK-WALL RING BIT SYSTEM

In applications such as water or geothermal well drilling, where you need to continue drilling after the casing is installed, a maximal inner diameter is required to allow for a regular drill bit.

End-bearing piles are typically drilled several metres into bed-rock, where the casing often serves as a load-bearing member. If any rock socket is drilled after casing is set (typically for a tensioning rod), there are no specific ring bit ID requirements.

This system is designed to drill straight piles through boulders, rock layers and into inclined bedrock. Often, the casing is also a load-bearing member. The heavy duty ring bit and casing shoe are not integrated, making this the most economical ring bit alternative. Typical applications include end-bearing piles or micro-piles, slope stabilization, pipe wall, king piles, etc.

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SOLITARY RING BIT SYSTEM– SACRIFICED CASING

Heavy duty ring bit

Heavy duty ring bit

Strong shoulders

Strong shoulders

The ring bit protects the

gauge buttons of the pilot

The ring bit protects the

gauge buttons of the pilot

Easy locking with

single shoulder design

Integrated ring bit

and casing shoe

Integrated ring bit

and casing shoe

The casing shoe

and ring bit are

not integrated

Large inner diameter

for maximum drill-

through possibilities

The ring bit protects

the gauge buttons

of the pilot

WHEN ONLY THE TOUGHEST WILL DO

If your job is so challenging that stock product is not enough, we

can create a project-specific heavy duty product for you. The tool

will be designed to meet the specific requirements specified.

Features will include strong double shoulders, ring bits made from

extra-durable material, and the option of long solitary ring bits and

interlocked ring bits.

Main applications for integrated systems:

End bearing piles including micro-piling

Pilings with sacrificed casings, which have

no large ID ring bit requirements

Slope stabilization

Pipe walls, king piles

Main applications for large ID ring bit systems:

Piling with sacrificed casings and rock socket

Energy/water wells

Surface casings (sealing, dewatering)

Main applications for solitary systems:

End bearing piles including micro piling

Pilings with sacrificed casings, which

have no large ID ring bit requirements

Slope stabilization

Pipe walls, king piles etc.

WELLDRILLINGWater and geothermal boreholes now tend to be drilled deeper and deeper. Depths of 300m are commonplace, so the right equipment is essential in order to meet the challenge. To ensure optimal results and project economy, the complete drill string – including drill pipes, hammer and bits – should be designed to optimize air flow.

A successful project demands technical solutions thatminimize fuel consumption and speed up drilling; time andcost are always major pressures. Reliability is key – abortingdrilling due to tool failure is expensive and unnecessary.

When drilling a water well or geothermal well, you need to go deep. Sandvik Twin Gauge bits takes you all the way. Sandvik Twin Gauge will continue drilling and keep the right diameter where conventional DTH drill bits reach the limit and should be resharpened or discarded.

SANDVIK TWIN GAUGE BITS

Over 15% longer service life compared to a conventional bitUnique design with enhanced flushing Assures smooth and reliable drillingUltimate performance in combination with Sandvik RH460 DTH hammer series

Sandvik High Flow pipes give longer life, improved drilling performance and the lowest pressure drop in the industry. The secret? Surface hardened tool joints, energy-optimized internal design and highly accurate threads. The cold-drawn seamless pipes are extremely straight, which means smoother drilling with less stress on the rig. Their higher strength enables thinner walls and lower weight.

SANDVIK HIGH FLOW DRILL PIPES

Friction welding removes

the need for shrink fit, which

means lower weight.

Joints are 100% metal to metal, with parent

metal properties and a low-temperature

process. This ensures high strength with

low risk of failure.

Threads are case hardened and

typically give 50% longer service life

compared to traditional materials.

A smooth inside surface

eliminates risk of scaling

destroying the hammer.

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FUEL-SAVING DESIGN

Lower air consumption means lower fuel

costs. The air cycle of the RH460 hammer

optimizes the expansion and compression

rate, giving more power with less air.

ROCK SOLID

The V-lock system is designed to prevent the movement of

the inner cylinder and air distributor, reducing galling-related

failures. This simple design means no tools are required for

assembly or disassembly. The steel make-up ring creates a

constant make-up force, independent of temperature and time.

SMOOTH RUNNING

The special oil grooves in the RH460 piston

ensure constant and consistent lubrication

between the piston and internal parts to re-

duce galling-related failures. They are also

designed to help to minimize air leakage.

The RH460 down-the-hole hammer has been developed with a focus on improving reliability and economy through reducing air consumption, increasing power and improving lubrication. It gives higher impact energy with lower levels of air consumption, securing high productivity in variable ground conditions.

The RH460 series consists of five standard-sized hammers from 3 1/2” to 8”. All are designed to utilize bits with generic shank types.

SANDVIK RH460

NO VIBRATION

The piston bearing surface is

designed and located for better

bearing capabilities. It eliminates

bending vibrations that can

result in galling failures.

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LARGE ID – SACRIFICED CASING

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RETRIEVABLE RING BITS SYSTEM

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INTEGRATED THICK-WALL RING BIT SYSTEM

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SOLITARY RING BIT SYSTEM – SACRIFICED CASING

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