Email: sales@prodrill.com.cn
Tel:0086-18959243380
Addr: Room 805 C1 Wanda Plaza, No.5 Jinzhong Road, Huli District, Xiamen, China
Retrieable SOD168 Symmetric Casing System ( Robit Type )
- Casing tube O.D.: 168.3mm
- Casing tube wall thincess : 10mm
- Ring Bit I.D.: 135mm
- Ring Bit O.D.: 178mm
- Pilot Bit O.D.: 176mm
- Drill Pipe: 76,89mm
- Ring Bits : 42CrMo
- Pilot Bit : 23CrNi3MoA
- Heat Treatment : Quenching and tempered
Retrieable ( Recyclable ) Symmetric Overburden Drilling Casing System, Casing Tube OD168 mm, ID155mm, including Polit Bit, Ring Bits + Casing Shoe.
Premium high qulity steel code DZ40 Casing Tube dia 168.3mm*3m*6mm left threaded pin and box threaded in casing pipe for SOD168 symmetric Casing System
Casing pipe weled with casing shoe of ring bit of Symmetric Overburden Drilling
Hydraulic puller casing tube for symmetric casimg system SOD168, 219mm
SOD168-DHD350 Symmetric Overburden Drilling System Assembly with 10 mm wall thickness Casing Tubes
Robit type SOD273-DHD380 Symmetric Overburden Drilling System Assembly with 10 mm thickness Casing Tubes
Pilot Bits for SOD168
Ring Bit Sets including Casing Shoes for SOD168
SOD168 Symmetrica Casing System
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.
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