SOD-114-Retrievable Symmetric Casing System by DTH Hammer

Rock drilling tools manufacturer ProDrill: Retrievable symmetric drilling system by DTH hammer is designed to drill and case a hole simultaneously through unstable ground conditions. The driver rock drill bits 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, minimizing the disruption of the drill hole’s surrounding.

Casing O.D.: 114mm
Casing Wall Max: 8mm
Ring Bit I.D.: 82mm
Ring Bit O.D.: 127mm
Pilot Bit O.D.: 91mm
DTH Hammer: 3.5”
Drill Pipe: 76mm

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.

SOD-114-Retrievable Symmetric Casing System by DTH Hammer:

Concentric Casing System by DTH Hammer Technical Data:

A complete set of the symmetric overburden drilling system

For more details please watch PDF online: Retrievable Symmetrix Casing System by DTH Hammer Catalogue