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| Magnum Piering
- Helix Piers | Case Study |
Project: On a much-cherished Island in the heart of
Virginia Beach, a custom residence was showing signs of settlement.
Engineers were called to evaluate the problem.
Description- During construction of the building
the intermediate pilings and grade beams called for on the
structural drawings were excluded. The floating pier and footings
that were installed had settlement of as much as 6”.
In addition, the right front corner of the house and masonry
fireplace had 1” of settlement. A soils investigation
showed that organic peat materials existed down to a depth
of 8' below grade. This home was built on a crawl space with
a height of 36”.
Solution- Magnum Piering
Crawl Space Piering- The contractor proposed
the installation of modified 60 kip duty Helix piers to replace
the failed footings and piers. The helix piers were manufactured
to 24” lengths with a 12” flight to allow installation
in the low crawl space. Each girder line required 5 helix
piers with an ultimate capacity of 16 kip and a working capacity
of 8 kips. Average pier depths were 14’ below grade.
After installation 60 kip wall pier caps were installed with
a 12” diameter cast in place pier cap to the new 12”X10”
laminated girder. After concrete placement and a 10-day curing
period the interior was lifted and loaded onto the piers,
then shimmed to the correct floor beam deflections.
Exterior Piering- Due to the affected area
being supported on pilings with grade beams, a decision was
made to stabilize this area with 6 Magnum Standard duty piers.
Each section was a standard 5’ length, galvanized, with
a 10” and 12” diameter flight. Each had dual cutting
edges with moment-balanced blades for cutting through debris
and to lesson wobble during installation. Average pier depth
of 13' with ultimate capacity of 38 kips and a working capacity
of 19 kips. |
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