China Symmetric Overburden Casing Drilling System with Ring Bits Pilot Bit

Symmetric Overburden Casing Drilling System With Ring Bits and pilot bit
The Prodrill symmetric drilling system is designed to drill and case a hole simultaneously through unstabled ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimising the disruption of the surronding of the drill hole.
Application Range: It is suitable for drilling water wells , geothermal wells , short mircopiles ,medium mini-type grouting hole of building , dam and harbour project .
1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit's upper shoulder engages the shoulder of the casing shoe.
2. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock . Part of impact energy advances casing.
3. On completion of drilling and casing , the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling . The ring bit stays in the hole , and can be recovered only if the casing is retrieved
4. Drilling continues to the desired depth in the bedrock using a conventional drilling.
Advantages:
Full face head desigh for faster penetration and straighter hole
Less torque is required
Can drilll in vertical, horizotal or any direction
Minimize disruption to the drilled hole
Other Models

RoBit Size Permanent/Top hammer
Symmetrix overburden drilling systemCode No.Casing O.D.Wall thicknessRing bit I.D.Ring bit O.D.Polit bit O.D.ThreadmminchmminchmminchmminchmminchRoBit-SOD 89893 1/2''40.157712.795993.898803.15T38RoBit-SOD 76763''80.315471.85903.543592.323T38RoBit-SOD 89893 1/2''80.31550.8294.93.736702.756T38RoBit-SOD 101101.64''100.394652.5591104.331793.11T38RoBit-SOD 1141144 1/2''100.39473.52.894120.34.73692.53.642T38RoBit-SOD 1401405 1/2''100.394943.701145.75.736117.54.626T45RoBit-SOD 1681686 5/8''100.3941275182.37.1771475.787T45

SOD Permanent/Top hammer
Symmetrix overburden drilling systemOrder numberCasing wall
max. thicknessRing bitPilot bitUnitInnerOuterOuterATLAS-SOD 768418858mm0.311.613.462.26inchATLAS-SOD 8985410070mm0.312.133.942.76inch

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