Boring
Machine Recovery
King County, Department fo Public Works
Renton, Washington
Other
Projects
I-405/SR-522 Stormwater Detention Vault—Woodinville, WA
Madison Park Condominium Basement—Seattle, WA
Terminal 5 Pipe Repair—Seattle, WA
Boring Machine Receiving Pit—Renton, WA
Remedial Excavation at Shuffleton Substation—Renton, WA
Microtunnel Receiving Shaft, Bear Creek Crossing—Redmond, WA
Arapahoe Coal Handling Facility—Englewood, CO
Canterbury Castle Underpinning—Portland, OR
I-405/SR-522 Stormwater Detention Vault—Woodinville, WA
Madison Park Condominium Basement—Seattle, WA
Terminal 5 Pipe Repair—Seattle, WA
Boring Machine Receiving Pit—Renton, WA
Remedial Excavation at Shuffleton Substation—Renton, WA
Microtunnel Receiving Shaft, Bear Creek Crossing—Redmond, WA
Arapahoe Coal Handling Facility—Englewood, CO
Canterbury Castle Underpinning—Portland, OR
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The goal of this project was to recover a $5 million boring machine which was stuck and unable to proceed. The machine was located between the Cedar River and the Renton Airport, 30 feet below the ground surface.
- Height restrictions at the airport would not allow the installation of sheet piles, and dewatering at this location was not permitted.
Freeze pipe installation
in trenches between runway and river.
Boring machine retrieval
from pit.
14-foot-diamter
manhole lowered inside frozen soil shoring after boring machine was retrieved.-
A frozen soil shoring wall was constructed around and below the boring machine to allow its safe retrieval.
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The frozen soil shoring provided stable walls during excavation and resulted in the successful retrieval of the boring machine. Because it also provided a dry excavation dewatering was not required.
- During the final phase of the project, the frozen soil shoring was widened to accommodate the placement of a 14-foot-diameter precast concrete vault.
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