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Application Range: It is suitable for drilling water wells , geothermal wells , short mircopiles ,medium mini-type grouting hole of building , dam and harbour 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.
1.Full face head desigh for faster penetration and straighter hole
2.Less torque is required
3.Can drilll in vertical, horizotal or any direction
4.Minimize disruption to the drilled hole
Specifications:
Consist of: Pilot bit, Ring bit and casing shoe
Type: Permanet and Retrievable type
Shank available: DHD, SD, QL, Mission and Numa type
Symmetrix overburden drilling system:
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Delivery: By sea, By air or by Express
