Case Study 551-3
ATLAS
RESISTANCE
PIERS
Damaged Foundation Drains
Cause 1-1/2 Inch Settlement of New House
Snowmass Village, Colorado
Installed by:
Stabilization Technology
Grand Junction, Colorado
DAMAGED DRAIN LINE CAUSE SETTLEMENT!
Description of the Structure: The custom
built split level residential structure is of wood frame construction with wood siding,
wood floor and composition shingle roof. The foundation is a concrete stem wall on a
concrete footing.
Cause of the Problem: During final grading, the contractor
crushed the foundation drain lines near the entry. Water was trapped adjacent to the
footing. As a result, water saturated the soil and caused the footing to settle at the
front wing of the house.
Soil Description: No soil information was available. The
house is situated on a sloping lot. The garage is at grade level and the living areas are
split above and below grade. The rear of the structure has a "walk-out"
basement. Based upon the pier installation records, the soil profile consisted of fill
soil and 10 to 15 feet of clay over a very dense stratum or rock layer.
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PROJECT
SUMMARY |
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| Repaired By: |
Stabilization Technology, Grand Junction,
Colorado |
| Average Drive Force: |
40,000 pounds |
| Average Lift Force: |
23,000 pounds |
| Number of Piers: |
3 ATLAS AP2S-3500 2-Piece Piers |
| Average Depth: |
22 Feet |
| Average Factor of Safety: |
1.74 : 1 Working F.S.
3.70 : 1 Ultimate F.S. |
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QUICKLY INSTALLED!
After excavation, the footing was notched to place the
structural load directly over the ATLAS RESISTANCE PIERS. Then the pier pipe was
driven vertically to a suitable bearing stratum and tested to an average force of 40,000
pounds before the structure was restored.
The photograph above shows pier number 1 being driven at the front corner
of the structure. Piers 2 and 3 have already been installed.
SUCCESS!
Once all of the ATLAS RESISTANCE PIERS were driven
to a suitable load bearing stratum and tested, the structure was gently and evenly lifted
using multiple hydraulic rams, a manifold assembly, and a hand pump.
The photo at right shows the project after lifting and prior to backfill. |
 
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