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SR 99 Tunnel Project
Tunnel Boring Machine Repair Plan Update
6/16/14
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Objectives of repair plan:
• Replace seals with more robust seal system
• Install new main bearing • Add steel repair pieces accommodate the new seal
system and provide additional rigidity
• Configure TBM operation and performance monitoring enhancements
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Update on Work in Progress
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Outer seal ring June 2, 2014
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Outer seal ring June 9, 2014
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Bearing block June 2, 2014
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Bearing block June 9, 2014
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Hitachi Zosen
Tunnel Boring Machine Repair Plan
6/16/14
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Video goes here
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Hitachi Zosen Tunnel Boring Machine Repair Plan
A. Preparation work in the shaft – 12 steps
B. Disassembly work in the shaft and lifting – 12 steps
C. Preparation work on the ground – 2 phases
D. Disassembly work on the ground – 10 steps
E. Assembly work on the ground – 9 steps
F. Lowering and assembly work in the shaft – 6 steps
G. Final activities – 8 activities
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A. Preparation work in the shaft Steps 1 to 5
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A. Preparation work in the shaft Steps 6 to 9
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A. Preparation work in the shaft Steps 10 to 12
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B. Disassembly work in the shaft and lifting work Steps 1 to 5
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Disassembly work in the shaft and lifting work Steps 6 to 9
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B. Disassembly work in the shaft and lifting work
Steps 10 to 11
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B. Disassembly work in the shaft and lifting work
Step 12
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C. Preparation work on the ground Phase 1 of 2
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C. Preparation work on the ground Phase 2 of 2
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D. Disassembly work on the ground Steps 1 to 4
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D. Disassembly work on the ground Steps 5 to 10
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E. Assembly work on the ground Steps 1 to 3
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E. Assembly work on the ground Steps 4 to 9
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F. Lowering and assembly work in the shaft Steps 1 to 4
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F. Lowering and assembly work in the shaft Steps 5 to 6
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G. Final activities
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Repair Schedule Milestones
Late May: Begin building the access pit’s underground walls.
Late July through September: Excavate the pit.
October: Remove the machine’s cutterhead and begin repairing damage to the seal
system and main bearing.
February 2015: Test machine to ensure it is ready to tunnel beneath downtown.
Late March 2015: Resume tunneling.