219mm Concentric Casing System for Major Civil Projects | MSD

The Challenge: Drilling in Difficult Ground

Drilling through loose overburden like sand, gravel, or backfill often leads to collapsing holes, stuck equipment, and significant project delays. In fractured or weathered rock, borehole integrity is constantly at risk, making it nearly impossible to achieve a clean, stable hole for piling or anchoring. These challenging ground conditions demand more than just a standard drill bit—they require a complete engineered system.

Our Solution: Simultaneous Drilling and Casing

MSD's Concentric Casing System is the definitive solution to these challenges. This advanced system features a pilot bit and a ring bit that work in unison. As the pilot bit drills the center of the hole, the ring bit simultaneously expands the hole to a larger diameter, allowing the 219mm steel casing to advance down with the drill string. This innovative process drills and cases the hole at the same time, completely securing the borehole wall from the moment drilling begins.

Key Features and Advantages

• Guaranteed Borehole Integrity: By casing the hole as it is drilled, this system completely eliminates the risk of hole collapse, ensuring a clean and stable large-diameter borehole for your most ambitious projects.

• Exceptional Hole Straightness: The concentric design provides superior guidance, delivering perfectly straight holes which is essential for the structural integrity of deep foundations and shafts.

• Powered by DHD360 Class Hammers: The pilot bit features a DHD360 shank, designed to handle the immense impact power of 6-inch class DTH Hammers for efficient drilling through challenging overburden.

• System Reusability: After reaching the desired depth into bedrock, the pilot bit is easily retracted through the casing for use on the next hole, making the system a highly cost-effective investment.

Primary Applications

• Major Foundation Piling: The primary application. Ideal for the largest construction and infrastructure projects, such as bridges, high-rises, and marine structures.

• Shallow Shaft Construction: A perfect system for creating shallow shafts for elevators, ventilation, or utility access in difficult ground.

• Specialized Geotechnical Projects: The go-to solution for complex geotechnical projects that require large, deep, and perfectly straight cased boreholes.

Technical Specifications

Standard & Custom-Engineered Solutions

Whether your project requires a proven tool from our standard catalog or a completely custom-engineered solution, our team of drilling experts is ready to assist. 

We excel at solving unique geological challenges and developing tools for non-standard requirements.