Double Casing Drilling System

Double casing drilling system Top hammer type drilling inside the casing DTH hammer type drilling inside the 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...

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Product Details

Double casing drilling system

Top hammer type drilling inside the casing

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DTH hammer type drilling inside the casing

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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.

 

Application Range

It can be widely used in drilling for grouting holes in projects such as cofferdam, foundation and geothermal well and etc.


Working principle:( Top hammer type)

1. Firstly, connect the crown opener bit and the outer casing tube, the drifter of the rig impacts the advancing of the outer casing tube, until finish the completion of the first tube.

2. The inner opener bit is connected with the drill rod, the drifter alongside the bore of the outer tube, until finish the completion of the first tube.

3. Connect the drill rod and the tube, the drifter of the rig push forward the external casing tube altogether with the drill rod until the external casing tube is reached the desired depth.

4. No need to add any casing tube in the bedrock, only apply with the drill rod to push down to the desired depth.

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Working principle:( Top hammer type)

1. Firstly, connect the crown opener bit and the external casing tube, the drifter of the rig impacts the advancing of the external casing tube, until finish the completion of the first tube.

2. The hammer connected with the drill rod, the hammer drill alongside the external casing tube until finish the completion of the first tube.

3. Connect the drill rod with the casing tube, the drifter of the rig push forward the external casing tube, the hammer impacts the drill rod forward until the external casing tube is reached the desired depth.

4. Drilling continues to the desired depth in the bedrock using a conventional drilling tools.

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