Button Bit
Drill Rod
Shank Adapter
Coupling Sleeve
Blade Bit
Coal Mining Drill Bit
Reaming Tool
Retrac Button Bit
Rotary Drill Bit
Cemented Carbide Grinding
Integral Steel Grinding
DTH Hammer
DTH Pipe
Jumbo Cluster Hammer
Low Air Pressure DTH
Anchor Tools
Sub Adaptor
DTH Bit Profile
Special DTH Bit
RC Tools
Overburden System
Pneumatic Rock Drill
Hydraulic Rock Drill
Excavator Mounted
Paving Breaker
Air Pick
Block Splitting
Block Pushing
Integral Steel Grinding
Polishing and Grinding
Abrasive Consumable
Diamond Blade and Drill

Concentric Casing

Prodemo has developed a range of Concentric Overburden Drilling Systems for the continuous casing of medium to large diameter holes-up to 378mm diameter. The equipment gives excellent performance for drilling through loose overburden materials down into solid bedrock. At the start of the drilling operation, the seat against the casing shoe, When drilling commences, the segments swing out to drill the hole to the PESired diameter. The machines can be withdrawn through the casing by rotating the system anti-clockwise against the solid base of the hole or up against the casing shoe.

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. When drilling starts , the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly
2. When the required depth is reached , rotation is reversed carefully, whereupon the reamer swings in , allowing the drill bit assembly to be pulled up through the casing.
3. Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent.
4. Drilling continues to the desired depth in the bedrock using a conventional drilling.

Concentric Casing

Features :
Hardening treatment of the part’s surface:with longer operating life and excellent anti-wear properties
Simple structure:greatly minimize the chances of structural failure, convenient operation
superior performance:take care of both the drilling wear life and drilling efficiency

Technical Data

Operation Procedure

1.when the drilling starts, the blocks slides down through the grooves on pilot bit,and reams to drive the casing shoes and tubes into the hole.

2.When finished the drilling in overburden rock formations, raise
the drilling tools and the blocks will get closed through the grooves,and the drilling tools can be pulled out from the hole.

3.Next construction can be followed.

Several Typical Models

 COD 168

COD 194

COD 274