Introduction: Protecting the Material Handling Heart of Shield Machines

The screw conveyor is critical for removing excavated material from the TBM face and advancing the machine. Operating in continuous contact with muck, groundwater, and abrasive soil, screw conveyors suffer rapid wear and corrosion that reduces efficiency and can cause catastrophic failures. FLD’s corrosion protection coating for shield machine screw conveyor provides comprehensive protection for this vital component.

Core Benefits

Combined Wear and Corrosion Resistance

Our coating addresses both the abrasive wear from excavated material and corrosion from groundwater, providing complete protection in one system.

Maintained Efficiency

Smooth, coated surfaces reduce friction between the screw and muck, maintaining conveyor efficiency and reducing power consumption.

Extended Component Life

Coated screws last 2-3x longer than uncoated alternatives, reducing replacement costs and downtime.

Leakage Prevention

Corrosion-induced pitting can cause muck leakage at the conveyor-to-chamber seal. Our coating prevents this deterioration, maintaining pressure control.

Key Features

Abrasion-Resistant Surface

Hard coating surface resists wear from sand, gravel, and rock particles in the excavated material.

Corrosion Barrier

Impermeable film prevents groundwater and soil chemicals from attacking the screw steel.

Low Friction Surface

Reduces material adhesion and improves muck flow through the conveyor.

High Adhesion

Maintains coating integrity under screw rotation and vibration.

Application Areas

• Screw conveyor shaft
• Screw flights and blades
• Conveyor trough interior
• Discharge gate areas
• Drive shaft connections

Why FLD?

• Specialized in TBM component coatings since 2001
• CE, ISO 9001, ISO 14001 certified
• Proven performance in major tunnel projects
• Custom formulations for soil conditions
• Full technical documentation

Conclusion

Shield machine screw conveyors are too critical for unprotected operation. FLD’s corrosion protection coating delivers wear and corrosion resistance that keeps conveyors operating efficiently throughout tunnel construction.

Contact FLD today.