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Seattle Tunnel Partners' work plan for repairing Bertha

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Published on Jun 16, 2014

This animation illustrates Seattle Tunnel Partners' work plan for repairing Bertha, the SR 99 tunneling machine. The plan includes four major repair and enhancement elements:
• Replacing the damaged seal system with a more robust system
• Replacing the main bearing
• Installing enhanced monitoring systems
• Adding steel to strengthen the machine and accommodate the new seal system

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