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Concentric Overburden Drill System
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Description:

The concentric overburden drilling system is composed of a center-oriented bit, a casing shoe and a symmetrical annular bit. The center-oriented bit drills the central portion of the hole and guides the drill string, which is combined with the sacrifice-symmetric ring bit to form a full-scale bit. Connect the casing shoe to the casing by welding or thread. The casing is pulled down by the impact of the Ding Hammer and the center guide bit.

The symmetrical annular bit and the Casing Shoe Assembly are locked in the center guide bit with a hammer handle, and the annular bit is used to push the casing down the drilling section. The upper shoulder of the guide bit is engaged with the shoulder of the casing shoe.

The impact energy of the Impact Hammer is transmitted through the guide bit and Ring Bit and the broken rock, and part of the impact energy is pushed through the casing. After the drilling and casing are completed, the drill string with the guide bit is removed by slight reverse rotation, and the bayonet coupling is released. The ring bit remains in the hole and can only be recovered when the casing is removed. Continue drilling to the desired depth in bedrock using conventional drilling methods.

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Product Detail
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Specifications of Concentric overburden drill system
Casing Tube OD Ring Bit OD Min. Casing Shoe ID Pilot Bit Diameter Hammer Shank Style
mm inch mm inch mm inch mm inch
108~127 4 1/4 ~ 5 118~134 4 5/8 ~ 5 1/4 78~101 3 1/16 ~ 4 77~92 3 1/32 ~ DHD3.5, Cop34, Mission 30
3 5/8
140~146 5 1/2 ~ 150 ~156 5 27/64 ~ 94~117 3 45/64 ~ 105~124 4 1/8 ~ DHD340A, SD4, QL40, Mission40
5 3/4 6 1/8 4 5/8 4 57/64
168~178 6 5/8 ~ 7 178~195 7 ~ 7 5/8 121~150 4 3/4 ~ 5 7/8 125~156 4 59/64 ~ DHD350R, SD5, QL50, Mission50
6 9/64
194~219 7 5/8 ~ 203~234 8 ~ 9 1/4 148~190 5 5/8 ~ 150~203 5 7/8 ~ 8 DHD360, SD6, QL60, Mission60
8 5/8 7 1/2
219~325 8 5/8 ~ 235~348 9 1/4 ~ 190~284 7 1/2 ~ 165~306 6 1/2 ~ DHD380, QL80, SD8, Mission 80
12 3/4 13 11/16 11 3/16 12 3/64
244~406 9 5/8 ~16 273~440 10 3/4 ~ 210~364 8 1/4 ~ 190~340 7 1/2 ~ SD10, Numa100
17 5/16 14 5/16 13 25/64
406~558 16 ~ 22 419~590 16 1/2 ~ 328~514 12 27/32 ~ 340~440 13 25/64 ~ SD12, DHD112, Numa120, Numa125
23 1/4 20 1/4 17 3/8
508~762 20 ~ 30 526 ~798 20 45/64 ~ 412~716 16 1/4 ~ 470~685 18 1/2 ~ SUP205
31 7/16 28 3/16 26 31/32
609~762 24 ~ 30 637~798 25 ~ 513~716 20 3/16 ~ 540~685 21 1/4 ~ SUP245
31 7/16 28 3/16 26 31/32
863 34 900 35 7/16 815 32 3/32 785 30 27/32 SUP325
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Other Products

Drilling through loose, loose materials such as soil, clay, silt, sand, gravel, and boulders is known as overburden, which is often problematic because the earth tends to collapse behind the drill. The symmetric casing drilling system is drilling in the rock stratum containing the Ellipse and the crack, and it represents the latest technology of the casing drilling system.

Our concentric overburden drilling system is designed to drill multiple sizes at any angle (including horizontal plane) and at any depth (over 100 m) simultaneously with the casing in unconsolidated formations, range from 108 mm to 863 mm (4 1/4 to 34 inches) .

The internal flush tank, together with the built-in casing shoe, seals the drill button well to minimize damage around the hole. It makes casing easy to track, equipment and operation simple, suitable for micro-piling, underpinning, anchoring, offshore operations and horizontal drilling and other applications.

Features and Advantages

☑ Stable and reliable working performance
☑ Full face head design for faster penetration and straighter hole
☑ Less torque is required than eccentric drilling
☑ Can drill in vertical, horizontal or any direction
☑ Minimize disruption to the drilled hole
☑ Effective cuttings removal
☑ Unlocking-relocking easily
☑ Easy to operate and system security
☑ Varied ring bit diameters to suit different casing requirement
☑ The less vibration of drill rig

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OUR SERVICE
☑ We will provide more precisely and efficiently manufacture and serve according to clients' drawings.
☑ We have professional QC team to ensure your product more better.
☑ Check the raw material before starting production.
☑ Have the random inspection during the processing.
☑ Make the 100% inspection before the shipments.
WHY ARE YOU CHOOSE US
☑ We have been engaged in tapered cross bit for more than 20 years.
☑ apered cross with conical pipe drilling perfect;
☑ Reliable work, high cost performance;
☑ Accurate the dimension of taper degree perfectly matches the rods;
☑ High grade tungsten carbide inserts;
☑ The drill bit is made of high quality steel and uses the most advanced CNC machinery and heat treatment process.
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