168mm Eccentric Casing System for Large Foundation Piles | 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: The Innovative Eccentric Mechanism

MSD's Eccentric Casing System provides a robust and efficient solution. This innovative system consists of a pilot bit and an integrated, swing-out reamer wing. During forward drilling, the reamer swings out to enlarge the borehole, allowing the 168mm casing to advance simultaneously with the drill string. This process drills and cases the hole in a single, fast operation. Once the desired depth is reached, a slight reverse rotation retracts the reamer, allowing the entire drill bit to be retrieved, leaving the casing in place.

Key Features and Advantages

• Fast Drilling and Casing: The aggressive design of the eccentric system allows for high penetration rates, making it one of the fastest methods for simultaneously drilling and casing a hole.

• Fully Retrievable and Reusable: The entire pilot bit and reamer assembly can be fully retrieved from the hole upon completion, ready for use on the next borehole. This significantly reduces tooling costs per project.

• Simple and Robust Design: With fewer moving parts, the eccentric system is exceptionally robust, reliable, and easy to use on-site, minimizing the risk of operational issues.

• Powered by DHD350 Class Hammers: The pilot bit features a DHD350 shank, designed to handle the higher impact power of 5-inch class DTH Hammers for drilling larger diameter holes through tough overburden.

Primary Applications

• Large Foundation Piling: The primary application. Ideal for major construction and infrastructure projects requiring 168mm piles to be drilled through challenging ground conditions.

• Slope Stabilization and Anchoring: A perfect system for installing deep, large-diameter ground anchors for major projects like highways and dams.

• Large-Diameter Water Well Casing: An essential tool for setting the surface casing for large-capacity industrial or municipal water wells.

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.