114mm Concentric Casing System for Foundation Piling | 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 114mm 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, stable, and full-depth borehole for your project.

• Exceptional Hole Straightness: The concentric design provides superior guidance through any formation, delivering perfectly straight holes that are critical for the structural integrity of 114mm foundation piles.

• Optimized for DHD3.5 Hammers: The pilot bit is designed with a DHD3.5 shank, ensuring perfect compatibility and efficient energy transfer from one of the industry's most reliable and widely used 3.5-inch DTH Hammers.

• 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

• Foundation Piling and Micro-piling: The primary application. Ideal for creating 114mm foundation piles that must pass through layers of unstable soil, sand, or backfill before reaching competent rock.

• Ground Support Anchoring: Perfect for drilling anchor holes in fractured or weathered rock for major civil engineering projects, ensuring the integrity of the hole for grouting.

• Water Well Casing: An essential tool for setting the initial surface casing in water well drilling, particularly in areas with deep overburden.

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.