Precision Measuring Instrument for Stay Cable Bridge Repair
The Eugene Talmadge Memorial Bridge underwent cable and damper system repairs after 15 years of service. DYWIDAG’s state-of-the-art precision measuring technology enabled the successful retrofit.
Background:
• Originally built (1953-1954), the old Talmadge Bridge was replaced with a new cable-stayed bridge in 1991 to accommodate larger vessels.
• The bridge features a 185 ft (311m) vertical clearance at high tide and 1,023 ft (56m) horizontal clearance.
Problem & Challenges:
• Urethane dampeners, placed at the base and top of each cable, suffered from continuous vibration, causing them to loosen over time.
• Due to temperature variations, both the cables and deck expand and contract, making damper placement highly complex.
• Retrofit difficulty: The new dampeners had to fit within the existing exit pipe geometry, requiring extreme precision.
DYWIDAG’s Solution & Innovation:
• State-of-the-art measuring instruments and reverse engineering software enabled precise data collection.
• Robotic arms measured down to one-thousandth of an inch, ensuring exact damper fit.
• A 3D model was generated based on real-time measurements for fabrication and installation.
Results & Impact:
• New dampeners were fabricated and installed within just one week.
• DYWIDAG’s advanced technology streamlined the measurement, production, and installation process.
• The Talmadge Memorial Bridge’s stability was restored, extending its service life and ensuring safe operation.
This project demonstrated cutting-edge precision engineering, reinforcing DYWIDAG’s expertise in structural rehabilitation.
