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Geo-Technical Performance Tooling

Boart Longyear's advanced manufacturing abilities not only result in quality products, but also enables Boart Longyear to produce custom tooling for unique drilling environments and applications.

Boart Longyear began manufacturing overburden drilling products in 1989 at our Burghaun facility in Germany to serve the foundation construction market in Europe. From the start, our customers appreciated our use of high-quality steels, precise heat treating friction welding and thread gauging as well as the development of new tungsten carbides for the drill bit line. Boart Longyear geo tools were quickly recognized by the industry as reliable and well-designed have become one of most respected in the industry. Within its geo tools line, Boart Longyear provides tooling for overburden cased drilling systems, jet grouting systems and ground freezing systems.

Overburden Cased Drilling Systems

Tools that allow controlled drilling in heaving sand and gravel conditions. Boart Longyear’s cased drilling systems add flexibility to drilling in varying conditions. In addition to the benefits of increased flushing control, the Inner and outer strings are able to be independently controlled on some systems, which greatly increases control over drilling. For deeper applications Boart Longyear’s double head drilling system allows for a dual string drilling system with internal flushing, which minimizes deviation from target. This method of drilling reduces risk, project time and produces optimal results.

icon-drive-drillingsystemDrive Drilling System

Ideal for use in soft ground conditions where flushing is not necessary or where flushing can be used without the risk of cavities.

icon-duplexdrillingsystemDuplex Drilling System

Duplex drilling utilizes an inner drill string and outer casing to control flushing and avoid cavities.

icon-doubleheadrotaryrotaryDouble Head Rotary / Rotary

This system independently advances an inner drill string and an outer casing to maintain borehole integrity and reach greater depths.

icon-doubleheadrotarypercussiveDouble Head Rotary / Percussive

Utilizes a rotary head to drive the outer casing and a hydraulic drifter to drive the inner drill string.

Jet Grouting System

These tools play an important role in ground modification / ground improvement.

Jet grouting is performed with either single, double or triple tube jet grouting systems. All components of the system are designed to withstand high injection pressures. Above the drill bit is the drill string monitor which houses the injection nozzles as well as the automatic valve which controls flushing and injection. The automatic valve allows regular low pressure flushing through the drill bit while the hole is being drilled. Once high pressure fluids are injected into the drill string the automatic valve closes, directing the high pressure flow out through special injection nozzles.

 

Jet Grouting Single Tube

Single Tube

Provide a path only for the injection of the cement suspension from the top of the drill string at the drill rig to special injection nozzles on the bottom of the drill tools above the drill bit.

Jet Grouting Double Tube

Double Tube

Made up of drill rods that have an inner and outer tube providing two separate paths for injection of the cement suspension and high pressure air into the soil.

Ground Freezing System

Prevent water intrusion and provide structural support for excavation with these tools.

Ground freezing is a temporary ground support technique that is used extensively for groundwater control and ground stabilization in underground construction and deep excavations. The process involves circulating refrigerated liquids through a series of subsurface pipes to freeze the ground creating a solid barrier that prevents water intrusion and provides structural support for excavation.

Product range

  • Freezing rods up to 114 mm diameter and lengths up to 3 m.
  • Driving rods with various bit configurations including carbide tips and flushing holes with check valves.
  • Rotary drive flanges.
  • Rotary percussive freeze rod systems available upon request.

Key features

  • Specially selected steel to provide strength required for drilling while also remaining stable when subjected to extreme low temperatures.
  • Specially designed threads that maintain a tight seal in the drill string, preventing leakage of freezing fluids into the surrounding ground.
  • Custom designed rod seals that can withstand low temperature as well as tolerate various greases commonly found on drilling sites.
  • Various configurations of driving points incorporating carbide inserts, flushing holes with check valves, and percussive bits.
  • Economical rod designs keeping total project cost to a minimum.

Boart Longyear offers a full range of bits designed for specific drilling applications. Our bits are constructed of high strength quenched and tempered steel and feature high quality tungsten carbide inserts. From Hemispherical button inserts to scalping button inserts our clients can customize their bits to meet their needs.

Casing Bits

Boart Longyear offers a large selection of casing bit to serve a wide variety of ground conditions. Casing bits are designed for rotary-percussive or rotation only drilling based on the tungsten carbide inserts utilized as well as the geometry of the bit. In addition to our standard offering, we offer customized tools for unique drilling applications.

Construction

Casing bit bodies are constructed of high strength quenched and tempered steel. The high quality tungsten carbide inserts are induction brazed into the steel bodies ensuring a secure fit without overheating issues associated with flame brazing. Strict machining control of the carbide seats prevent premature loss of carbide inserts.

Gauge Protection

Boart Longyear offers tungsten carbide gauge protection on casing bits. Gauge protection will prevent excessive wear on the outer diameter of the bit in abrasive grounds. Additionally, in unconsolidated ground conditions where the ground is caving in on the drill string the gauge protection will assist in freeing the bit and casing by providing another cutting surface.

Shrink Fit Carbides

We can offer, on request, shrink fitting installation of all hemispherical, ballistic, and two-step tungsten carbide inserts instead of the standard induction brazing. This very precise construction method is often utilized when drilling in extremely hard ground conditions and provides both increased button retention and longer overall life.

Advantages

  • Computer controlled inductive brazing of tungsten carbide inserts provides superior process control and prevents overheating common with flame brazing.
  • High grade body construction with quenched and tempered steels.
  • Optional tungsten carbide gauge protection available to assist in unconsolidated grounds and increase life in abrasive conditions.
  • Specialized designs for unique drilling situations such as drilling through reinforced concrete and drilling without inner bits.

Inner String Bits

We offer a selection of bits for the inner drill string of overburden drilling systems to serve the wide variety of ground conditions that drillers face every day. The inner drill string bits are primarily designed for rotary-percussive drilling but in some situations can perform well in mixed drilling or pure rotary drilling. In addition to the common designs, Boart Longyear™ offers several specialty designs for unique drilling situations and can also design custom bits on request.

Construction

The bit bodies are constructed of high strength quenched and tempered steel. The high quality tungsten carbide inserts are induction brazed into the steel bodies insuring a permanent fit without overheating issues associated with flame brazing. Strict machining control of the carbide seats prevent premature loss of carbide inserts.

Gauge Protection

We offer tungsten carbide gauge protection on some designs. Gauge protection will prevent excessive wear on the outer diameter of the bit in abrasive grounds.

Shrink Fit Carbides

Boart Longyear can, on request, shrink fitting installation of all hemispherical, ballistic, and two-step tungsten carbide inserts instead of the standard induction brazing. This very precise construction method is often utilized when drilling in extremely hard ground conditions giving the bits enhanced performance.

Advantages

  • Computer controlled inductive brazing of tungsten carbide inserts provides superior process control and prevents overheating common with flame brazing.
  • High grade body construction with quenched and tempered steels.
  • Optional gauge wear protection tungsten carbides available to assist.

Drive Drilling Bits

flatcollarbitsFlat Collar Bit

Fits into end of casing with no locking mechanism to the casing, designed to leave in the ground not able to be reterived. No flushing holes or cutting surface on this bit.


rotationlockbitsRotation Lock Bit

Bit locks onto the bottom of the casing and allows for the bit to be reterived if desired. No flushing holes or cutting surface on this bit.


rotationlockbit-flushingholes-cuttingbladeRotation Lock Bit with Flushing Holes and Cutting Blade

Bit locks onto the bottom of the casing and allows for the bit to be retrieved if desired. Designed to utilize a flushing medium and also has carbide surfaces for cutting.


rotationlockbit-flushingholesRotation Lock Bit with Flushing Holes

Bit locks onto the bottom of the casing and allows for the bit to be retrieved if desired. Designed to utilize a flushing medium and also has carbide surfaces for cutting.


flatcollardriveshoesFlat Collar Drive Shoes

Threads onto the drive casing and then mates with the flat collar bit to provide a true drive shoulder and prevents damage to the casing.


rotaionlockdriveshoesRotation Lock Drive Shoes

Thread onto the drive casing and then locks with the lock bits to provide a locking surface and prevents damage to the drive casing.

Bit Inserts

Boart Longyear offers five unique button inserts to match client’s needs. Dependent upon drilling method and formation being encountered specific inserts can be selected to obtain maximum results.

hemisphericalbuttonHemispherical Button

Applicable for hard rock- Best suited for rotary-percussive drilling- Low abrasion

- 25 000 to 45 000 PSI (170 a 300 MPa)


ballisticbuttonRotation Lock Bit Ballistic Button

Applicable for medium hard rock (mudstone, marl, sandstone), as well as loose rock- Best suited for rotary-percussive drilling- 10,000 to 20,000 PSI (70 to 140 MPa)


Scraping Button Scraping Button

Applicable for loose rock as well as soft geological formations (mudstone, marl)- Best suited for rotary drilling with temporary percussion


twostepbuttonRotation Lock Bit with Flushing Holes Two Step Button

Applicable for medium hard rock (mudstone, marl, sandstone), as well as loose rock- Best suited for rotary-percussive drilling


Flat Collar Drive Shoes Scalping Button

Applicable for concrete, conditional, loose rock and soft geological formations- Best suited for rotary drilling

Overburden Rods and Casing

Rotary Percussive Rods Friction Welded – TDN

  • TDN drill rods are designed for use on the inner drill string of Duplex and rotary-percussive drilling systems. TDN rods are an alternate to the T3 and T45 extension rods used in these systems. Up-hole flushing velocity may be reduced when using T38 and T45 rods due to the large annulus.
  • TDN systems are designed to minimize the area between the inner rod and casing so that up-hole flushing velocity is optimized. The bigger inner diameter of the inner rod allows a higher flushing medium flow without creating back-pressure. In addition to improved flushing, TDN systems also utilize the patented TwinDrive rotary percussive thread and the highest grade thread steel to provide longer rod life.
  • Friction welded rods have quenched and tempered pin and box ends constructed of high tensile strength steel. The threaded ends are friction welded onto a mid-body manufactured from annealed mid-grade steel.

API Drill Rods 

  • API DTH drill rods are designed for use in rotary and rotary DT applications. These are commonly used as single rotary rods or as the inner drill string on double head rotary-rotary applications.
  • The rod ends of our API rods are constructed of high tensile strength quench and tempered steel. The rod ends are gas nitrated to provide additional life to the drill string. Rod ends are friction welded onto mi grade mid-body material.
  • API rods are manufactured in a variety of lengths and wall thickness and include IF designs for additional flushing capacity. Boart Longyear can manufacture alternative rod lengths and spanner flats upon request.

Extension Rods T38/T45

  • T38 and T45 extension drill rods are designed for use as the inner drill rod extension for double head rotary percussive drilling systems. The extension drill rod is designed with male threads on both ends with a coupling connection between them.
  • The T38 and T45 thread profiles are specially designed to withstand the percussive forces exerted on the inner drill string by the hydraulic drifter.
  • The outer diameter of the extension drill steel is relatively small compared to the inner diameter of the casing. This can cause the inner drill string to have movement within the casing. To reduce this movement, Boart Longyear also offers couplings with centralizing guides to keep the rods on center in the casing.
  • TDN drill rods are an alternative for T38 and T45 drill steel and feature improved flushing capacities and decreased tolerances between the inside diameter of the casing.

Jet Grouting Rods and Casing

Jet Grouting Rods

  • The jet grouting rod ends are constructed from the same high strength steel utilized in all percussive casing. Rod ends are then nitrated and friction welded to an annealed steel mid-body.
  • Inner tubes in the dual tube systems are secured inside the outer rod utilizing a circlip or wire fuse connection. This allows for easy removal, repair, or replacement of the inner rod as required.
  • The sealing materials in the jet grouting systems are specially designed to resist damage from the abrasive grouts and numerous make and break cycles, which limits the amount of time spent changing rod seals and maximizes time spent grouting.

Ground Freezing Rods and Casing

Boart Longyear manufactures ground freezing drill rods that are installed for refrigerated liquid circulation. Freezing rod applications have some unique challenges that are not found in typical foundation construction drilling application. Boart Longyear has gone through extensive development processes to ensure the freezing rods we provide incorporate our knowledge of construction drilling as well as unique technologies that are special to the ground freezing application.

Warranty

Boart Longyear offers a warranty for its Geo Tooling.

From wrenches and plugs to fishing tools, Boart Longyear  offers a full range of tools and accessories that meet the demands of today’s driller.