273mm Eccentric Casing System for Mega-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: 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 273mm 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 DHD380 Class Hammers: The pilot bit features a DHD380 shank, designed to handle the ultimate impact power of 8-inch class DTH Hammers for efficient drilling of extra-large diameter holes.

Primary Applications

• Mega-Foundation Piling: The primary application. Ideal for the largest and most ambitious construction projects, such as major bridges, skyscrapers, and offshore platforms.

• Large Shaft Construction: A perfect system for creating large shafts for elevators, ventilation, or utility access in challenging ground conditions.

• Specialized Geotechnical Projects: The definitive solution for complex geotechnical projects that require extra-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.