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SOD-108 Unrecycleable (permanent) Symmetix Casing System
- Casing O.D: 108mm
- Casing Wall Max: 8mm
- Ring Bit I.D: 77mm
- Ring Bit O.D: 118mm
- Pilot Bit O.D: 86mm
- Drill Pipe: 76
Permanent ( Unrecycleable , one-time usage ) SOD Symmetric Overburden Drilling System , which is designed to drill and case a hole simultaneously through unstable ground conditions.
Ring Bit and the Casing Shoe are combined to form a reaming assembly, which can rotate freely with each other, but cannot be separated. The reaming assembly is welded on the Casing Tube.
The driver rock drill bits incorporated with one-time usable 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, minimizing the disruption of the drill hole\'s surrounding.
1.Permanent type SOD casing drill bit with no connection between Ring Bit and Casing Shoes
2.Permanent type SOD casing drill bit with soft pin connection between Ring Bit and Casing Shoes
3.Permanent type SOD casing drill bit with no seperation between Ring Bit and Casing Shoes
Application Range: suitable for drilling water wells, geothermal wells, short mircopiles, medium mini-type grouting hole of building, dam and harbor 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.
For more details please watch PDF online: Unrecycleable (permanent ) Symmetric Casing System by DTH Hammer Catalogue
