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 146mm 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.
Exceptional Hole Straightness: The concentric design provides superior guidance, delivering perfectly straight holes which is critical for the structural integrity of deep foundation piles.
Powered by DHD340 Class Hammers: The pilot bit features a DHD340 shank, designed to handle the high impact power of 4-inch class DTH Hammers for efficient drilling through tough 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
Demanding Foundation Piling: The primary application. Ideal for large-scale construction projects requiring 146mm piles to be drilled through challenging overburden or boulder-filled ground.
Deep Ground Anchors: A perfect system for installing deep, large-diameter ground anchors for major civil engineering projects like bridges and retaining walls.
Pre-Drilling for Larger Piles: Can be used to create a secure, cased pilot hole for even larger piling systems.
Technical Specifications
MSD-CCS-D340-146 Concentric Overburden Casing System |
Casing Outer Diameter (OD) | 146mm |
Casing Inner Diameter (ID) | 126mm |
Casing Wall Thickness | 10mm |
Drilled Hole Diameter | 124mm |
Pilot Bit Diameter | 10mm |
Compatible Shank Type | COP44/DHD340/TH4/SD4/QL40 |
Max. Pass-Through Diameter | 110mm |
Weight | 22kg |
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.