Bull Run Water Filtration Project
Custom Tunneling Shield System
Project Location
Portland, OR
Project Overview
KEE engineered and fabricated a 114-inch diameter digger shield to excavate twin, parallel 1,240-foot-long tunnel alignments as part of the Portland, Oregon’s Bull Run Filtration Project. Designed to operate in both soft soils and hard rock, the shield features a reinforced digger arm engineered to accommodate a hydraulic drum cutter (aka, road header) for use in formations too hard for standard bucket teeth. Primary ground support will be provided by ribs and boards assembled within the shield. Final assembly and factory testing were completed at Bradshaw Construction Corporation’s facility in Maryland, with the shield delivered to the project site in early February 2025.
Custom Convertible Digger Shield
The project involved providing twin rolling gantry cranes with onboard diesel generator and hydraulic power units.
Key features include:
- Articulated Digger Arm
- Axial hydraulic drum cutter
- Articulated Steering
- Hydraulic Thrust System
- Belly Pack Wireless Remote Control System (Thrust, Steering, Digger Arm, Drum Cutter, Etc.)
- Trailing gear
- 200 hp HPU
- Lighting system
- Automated Fire System
- Gas Monitoring System
