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|Casing O.D:||89mm||Casing Wall Max:||8mm|
|Ring Bit I.D:||50.8mm||Ring Bit O.D:||94.9mm|
|Pilot Bit O.D:||70mm||Code No.:||RoBit-SOD 89|
RoBit-SOD 89 Symmetix Casing System by Top Hammer;Symmetric / Concentric Overburden Casing Drilling System
Rock drilling tools manufacturer ProDrill: Symmetric drilling system is designed to drill and case a hole simultaneously through unstable 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 minimizing the disruption of the surrounding of the drill hole.
Concentric eccentric with tube drill bit with reaming ring Concentric high-pressure drilling tool Drilling hole with high drilling efficiency, to prevent collapse of the hole, the hole is not bent and is mainly used for: hard, loose, broken or gravel, etc. The drilling of the formation into the casing has the advantages of good wall protection performance and high drilling efficiency.
With the industry-leading imported heat treatment technology, the hardness and toughness of the steel body are increased by 35%.
The alloy teeth adopt a professional over-pressure sintering process to greatly improve the strength of the alloy teeth.
The use of high-quality steel as the product steel body, life expectancy, steel body does not break.
Perfect after-sales guarantee system, quality problems occur, return and exchange.
RoBit SOD 89 Symmetix Casing System with rock drill bits: Ring bit and Pilot bit by Top Hammer
Application Range: Suitable for drilling water wells, geothermal wells, medium mini-type grouting hole of building, dam,tunnel umbrella 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.
Forepoling,also known as tube umbrella,tunnel umbrella, is an application used to strengthen tunnel roof in broken rock condition.Drilling system consists of casing tubes which are drilled through the overburden as an umbrella and filled with grouting.ProDrill symmetric casing system allows easy driving of the casing tubes into the ground with low torque demand.
ProDrill symmetric casing overburden drilling system mostly used in forepoling are ProDrill+88,9/8, ProDrill 114,3/10,and ProDrill 139,7/10.
|Code No.||Casing O.D.||Wall thickness||Ring bit I.D.||Ring bit O.D.||Polit bit O.D.|
|Code No.||Casing wall max.thickness||Ring bit||Pilot bit||Unit|
ROBIT-SOD and Atlas-SOD