*mydirectindustry

Catalogs
MAXDRILL ROCK TOOLS CO., LTD
CONCENTRIC OVERBURDEN DRILLING SYSTEM

CONCENTRIC OVERBURDEN DRILLING SYSTEM

Product catalog summary

Concentric Casing Systems Overview

Application Range:
Recommended for drilling in rock formations with ovals and fractures.

Design Principles:
Focus on stable and reliable performance with minimal vibration.

Structures:
Includes concentric systems with ring bits, wings, and blocks.

Components:
A: Discharge Head, B: Drill Rod, C: Guide Sleeve, D: DTH Hammer, E: Casing Tube, F: Pilot Bit, G: Casing Shoe, H: Ring.

With Ring Bits:

Permanent: The pilot bit drives the ring bit down, followed by the casing shoe and tube. At bedrock, reverse circulation removes the pilot bit, leaving the ring bit in place for concrete pouring or further construction.
Retrievable: Similar to permanent, but the casing tube and ring bit are removed together, allowing for concrete pouring simultaneously.

Technical Specifications:
Various models (KC85 to KC815) with specifications such as outer diameter, thickness range, and compatible hammer types. For example, KC85 has an outer diameter of 108 mm and uses a DHD 3.5 hammer.

With Wings:

Operation Procedure: Wings extend during drilling to drive casing shoes and tubes. Upon completion, reverse drilling closes the wings for tool retrieval.

Technical Specifications:
Models (KCC125 to KCC275) with details on outer diameter, thickness, and hammer types. For instance, KCC125 has an outer diameter of 114 mm and uses a DHD 350 hammer.

With Blocks:

Operation Procedure: Blocks slide down grooves to drive casing shoes and tubes. Upon completion, blocks close for tool retrieval.

Technical Specifications:
Models (KB1 to KB8) with specifications such as outer diameter and pilot bit size. For example, KB1 has an outer diameter of 184 mm and uses a QL 50 hammer.

Catalog excerpts

Concentric Casing Systems Application Range: It is recommended to drill in rock formation where contains some ovals and fractures. Design Principles: The stable and reliable working performance and the less vibration of drill rig. Different Structures: Concentric system with ring bits, wing and blocks. A: Discharge Head B: Drill Rod C: Guide Sleeve D: DTH Hammer E: Casing Tube F: Pilot Bit G: Casing Shoe H: R

Open the catalog to page 1

With Ring Bits 1. When drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing tube. 2.At the bedrock, start Reverse circulation of tools and pull the pilot bit from the drill hole leaving the ring bit in the hole. 3. Pour the concrete or do the next constructions work. 1.After the drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing tube. 2. At the bedrock, start Reverse 3. Pull the casing tube out with the circulation of tools and pull the pilot ring bit and at the same time pour the...

Open the catalog to page 2

Thickness Range Hammer Type Drill Pipe Range

Open the catalog to page 3

MAXDRILL ROCK TOOLS CO., LTD www.max-drilling.com MAXDRILL

Open the catalog to page 4

With Wings Guide Device Operation Procedure 1. The wings swing out soon after the drilling start and the ream drives the casing shoes and tubes in the drill hole. 2. After completed the drilling process in overburden rock formation, as soon as the reverse drilling process start the wings will get closed, so the drilling tools can be pull back from the drill hole. 3. Follow the next drilling process. Thickness Range Hammer Type Drill Pipes

Open the catalog to page 5

MAXDRILL ROCK TOOLS CO., LTD www.max-drilling.com With Blocks Assembly Operation Procedure 1. At the start of drilling, the blocks slides down through the grooves on pilot bit, and the ream drives the casing shoes and tubes into the drill hole. 2. After complete the drilling process in overburden rock formations, raise the drilling tools then the blocks will get closed through the grooves, the drilling tools can be pulled out from the drill hole. 3. Next construction can be followed.

Open the catalog to page 6

CONCENTRIC OVERBURDEN DRILLING SYSTEM

CONCENTRIC OVERBURDEN DRILLING SYSTEM

Catalog excerpts

All MAXDRILL ROCK TOOLS CO., LTD catalogs and technical brochures