Email: sales@prodrill.com.cn
Tel:0086-18959243380
Addr: Room 805 C1 Wanda Plaza, No.5 Jinzhong Road, Huli District, Xiamen, China
SOD140 Symmetrica Casing System for Overburden Drilling in water well project
- Casing tube O.D.: 140mm
- Casing tube wall thincess : ≤6mm
- Ring Bit I.D.: 116mm
- Ring Bit O.D.: 156.5mm
- Pilot Bit O.D.: 127mm
- Drill Pipe: 76mm
Retrieable ( Recyclable ) Symmetric Overburden Drilling Casing System, Casing Tube OD140 mm, ID116mm, including Polit Bit, Ring Bits + Casing Shoe.
Symmetric Casing System SOD140 Technical Drawing
Symmetric Casing System SOD140 ( Ring Bit I.D.: 116mm, Ring Bit O.D.: 156.5mm Polit bit O.D.: 127mm , ,Casing tube O.D.: 140mm, Casing Tube wall thickness : ≤6mm )
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.
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.
