DTH is the short for "down-the-hole". The down-the-hole drilling is used to produce large-diameter holes in rocks, usually in the initial stage prior to blasting, but it is also used in non-blasting applications. DTH drilling are used mostly in mining quarries but can be used in a variety of other construction applications. The DTH drilling method is growing in popularity, with increases in all application segments, including blast-hole, water well, foundation, oil & gas, cooling systems and drilling for heat exchange pumps. Applications were later found for the DTH method underground, where the direction of drilling is generally upwards instead of downwards.
DTH (Down The Hole) hammer
The “Down-the-hole” or DTH hammer is used for drilling holes through a wide range of rock types. In DTH drilling, the hammer is located directly behind the drill bit. The drill pipes transmit the necessary feed force and rotation to hammer and bit plus compressed air for the hammer and flushing of cuttings. The drill pipes are added to the drill string successively behind the hammer as the hole gets deeper. The piston strikes the impact surface of the bit directly, while the hammer casing gives straight and stable guidance of the drill bit. This means that the impact energy does not have to pass through any joints at all. The impact energy therefore remains constant, regardless of the hole depth.
The “Down-the-hole” or DTH hammer is used for drilling holes through a wide range of rock types. In DTH drilling, the hammer is located directly behind the drill bit. The drill pipes transmit the necessary feed force and rotation to hammer and bit plus compressed air for the hammer and flushing of cuttings. The drill pipes are added to the drill string successively behind the hammer as the hole gets deeper. The piston strikes the impact surface of the bit directly, while the hammer casing gives straight and stable guidance of the drill bit. This means that the impact energy does not have to pass through any joints at all. The impact energy therefore remains constant, regardless of the hole depth.
- DTH (Down The Hole) hammer range:
3” DTH (Down The Hole) hammer: DHD 3.5, COP 34, COP 32, Mission 30, BR 3, Mach 303;
4” DTH (Down The Hole) hammer: DHD 340/COP 44, COP 42, QL 40, SD 4, Mission 40, XL 4, Mach 44;
5” DTH (Down The Hole) hammer: DHD 350/COP 54, COP 52, QL 50, SD 5, Mission 50, XL 5;
6” DTH (Down The Hole) hammer: DHD 360/ COP 64, COP 62, QL 60, SD 6, Mission 60, XL 6;
8” DTH (Down The Hole) hammer: DHD380, QL 80, SD 8, Mission 80;
DTH (Down The Hole) bits
“Down-the-hole” (DTH) drill bits are used with “Down-the-hole” hammers for drilling holes through a wide range of rocks types. In conjunction with DTH hammers, drill bits are designed with a splined drive for rotating the bit in the ground. Drill bits are available in different sizes and different styles so they can drill a wide range of hole sizes.
“Down-the-hole” (DTH) drill bits are used with “Down-the-hole” hammers for drilling holes through a wide range of rocks types. In conjunction with DTH hammers, drill bits are designed with a splined drive for rotating the bit in the ground. Drill bits are available in different sizes and different styles so they can drill a wide range of hole sizes.
- DTH (Down The Hole) bits range:
Front type: Flat face, Convex face, Concave face, DGR face;
T.C inserts shape: Spherical buttons/ dome buttons, Ballistic buttons/parabolic buttons;
DTH shank identification: DHD, COP, SD, QL, MISSION, XL, MACH...
Chart of famous brand hammer and their shank style: BR, DHD, COP, SD, QL, XL, MISSION, MACH...
DTH bits diameter range:
3" DTH bits (90mm - 105mm), shanks : DHD 3.5, COP 34, COP 32, Mission 30, BR 3, Mach 303;
4" DTH bits (105mm- 130mm), shanks: DHD 340/COP 44, COP 42, QL 40, SD 4, Mission 40, XL 4, Mach 44;
5" DTH bits (130mm- 152mm), shanks: DHD 350/COP 54, COP 52, QL 50, SD 5, Mission 50, XL 5;
6" DTH bits (152mm- 171mm), shanks: DHD 360/ COP 64, COP 62, QL 60, SD 6, Mission 60, XL 6;
8" DTH bits (200mm- 305mm), shanks: DHD380, QL 80, SD 8, Mission 80;
Customs design is available.
DTH (Down The Hole) drill rods:
DTH drill rods are used for connecting DTH hammer and DTH button bits; they are made from seamless tubes. Tubes play a significant role in all DTH drilling, regardless of application, rock type, hole depth or drill rig. The key features of a high quality DTH tube are durability, accuracy and manageability.
DTH drill rods are used for connecting DTH hammer and DTH button bits; they are made from seamless tubes. Tubes play a significant role in all DTH drilling, regardless of application, rock type, hole depth or drill rig. The key features of a high quality DTH tube are durability, accuracy and manageability.
ODEX/ Eccentrics overburden drilling system:
The ODEX overburden drilling system utilizes an eccentric under reamer to cut a drilled hole ahead of the bottom of the casing. The casing is then simultaneously advanced by a percussive force applied to either the top or bottom of the casing. As the hole is advanced, the drill cuttings are normally removed by air and travel up the inside of the casing in the annular space between the casing ID and the drill rod OD. The ODEX method is highly effective in overburden soils where boulders or gravel layers are present, or when layers of rock must be penetrated. This method also subjects surficial and localized soils to some vibration.
The ODEX overburden drilling system utilizes an eccentric under reamer to cut a drilled hole ahead of the bottom of the casing. The casing is then simultaneously advanced by a percussive force applied to either the top or bottom of the casing. As the hole is advanced, the drill cuttings are normally removed by air and travel up the inside of the casing in the annular space between the casing ID and the drill rod OD. The ODEX method is highly effective in overburden soils where boulders or gravel layers are present, or when layers of rock must be penetrated. This method also subjects surficial and localized soils to some vibration.
- How does the ODEX/ Eccentrics drilling system work?
ODEX/ Eccentrics drilling system size:
ODEX 90 for 3” DTH hammer, including the specifications of Guide device, casing shoe, reamer and pilot bits:
ODEX 115 for 4” DTH hammer, including the specifications of Guide device, casing shoe, reamer and pilot bits:
ODEX 140 for 5” DTH hammer, including the specifications of Guide device, casing shoe, reamer and pilot bits:
ODEX 144 for 5” DTH hammer, including the specifications of Guide device, casing shoe, reamer and pilot bits:
ODEX 165 for 6” DTH hammer, including the specifications of Guide device, casing shoe, reamer and pilot bits:
ODEX 190 for 6” DTH hammer, including the specifications of Guide device, casing shoe, reamer and pilot bits:
ODEX 240 for 8” DTH hammer, including the specifications of Guide device, casing shoe, reamer and pilot bits:
Symmetrix Overburden drilling system
Symmetrix is a concentric drilling system with retrievable pilot bits. This system drills in any direction and in any type of ground condition. It is, in fact, the most flexible and efficient overburden system on the market today.
Symmetrix is a concentric drilling system with retrievable pilot bits. This system drills in any direction and in any type of ground condition. It is, in fact, the most flexible and efficient overburden system on the market today.
- How does the Symmetrix overburden drilling system work?
The Symmetrix components are made up of:
---A pilot bits with large internal flushing holes and external flushing grooves
---Symmetrical ring bit (reamer) with internal bayonet coupling
---Casing shoe for driving of casing.
The Pilot bits is attached to any common DTH hammer shank.
DTH (Down The Hole) Spare parts:
We are supplying high quality spare parts for refurbishing of DTH hammer, and also the following:
We are supplying high quality spare parts for refurbishing of DTH hammer, and also the following:
