Canterbury
Castle Underpinning
Private Owner
Portland, Oregon
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 Recovery—Renton, 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
I-405/SR-522 Stormwater Detention Vault—Woodinville, WA
Madison Park Condominium Basement—Seattle, WA
Terminal 5 Pipe Repair—Seattle, WA
Boring Machine Recovery—Renton, 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
- Frozen soil was used to underpin a historical structure in Portland, Oregon’s west hills area while the vacant lot between it and a neighboring home was stabilized and a foundation for a new home was built.
- Site soils consisted of silts and clay with three slide planes present in the unstable hillside lot; one ancient slide plane; and two recent planes
Frozen-soil shoring system installed on difficult slope.
View of castle and frozen-soil system.
Main footing of new home being poured.
Start of freeze-pipe installation.
- The recent slide planes failed in February 1996 and also in November 1998 depositing hundreds of cubic yards of soil onto a city street below.
- Previous attempts to stabilize the vacant lot were unsuccessful.
- The unstable vacant lot jeopardized the access road to several homes above and below it.
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