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B10-6021ENG Solutions and tools for overburden drilling THE POWER TO CUT THROUGH CONSTRUCTION.SANDVIK.COM

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  • B1

    0-6

    02

    1E

    NG

    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

    3

    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.

    4

    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.

    6

    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.

    7

  • LARGE ID – SACRIFICED CASING

    8

    RETRIEVABLE RING BITS SYSTEM

    9

  • INTEGRATED THICK-WALL RING BIT SYSTEM

    10

    SOLITARY RING BIT SYSTEM – SACRIFICED CASING

    11