Jiffy Lube Shop On Helical Screw Piles

When a swampy and saturated build site causes serious problems with compaction, a commercial project is threatened. See how our team overcame challenging soil to deliver an economical foundation.

    Client: Jiffy Lube
    Location: Moncton, NB
    Helical Pile Material: Galvanized steel
    Helical Pile Dimensions: ● 3-1/2" x 10', 12" helix● 5' extensions
    Embedment Depth: 20' - 25'
    Site Conditions: Engineered fill that failed the compaction test
    Time to Complete:● 1 week

Saturated Soil Threatens Project

Postech Moncton was approached by a client who was looking to build a Jiffy Lube location on an existing site. However, the job site was located in an area that was originally a swamp. Ground conditions were wet, mucky, and soft.
Building plans called for poured concrete beams to support the structure, but there were engineering concerns about the bearing capacity of the soil.
The engineer requested that fill be added to ensure the ground was suitable for construction. In response, the client obliged and had large amounts of fill brought in. Unfortunately, the fill did not improve conditions enough to gain engineer-approval.
With money already invested in the site and facing the prospect of having to abandon it, the client was in serious need of a foundation solution that would overcome muddy conditions and allow their project to continue.

Illustration

Our Solution

Once our team had a good look at the site and understood the difficult conditions, we knew there was only one solution: go deeper.
We determined that by installing helical screw piles to 20' deep or more, the swampy layer could be avoided and the foundation anchored into strong soil. Coordinating with our client's engineers, Postech Moncton designed the piles and top-plates so rebar could be easily tied-in to transition to concrete beams. We also handled the loading calculations.
During the design process, we established required torque figures for the screw piles. One of the huge benefits of a screw pile foundation is we can use torque to ensure the safety, quality, and accuracy of installation by confirming we're anchoring the pile in firm soil.
Our installers used a digital torque reader to monitor and record installation depth and torque in real-time, giving the client and their engineers complete confidence and traceability.
It only took one single week to install the helical screw piles. Using 5' extensions allowed us to quickly install each pile to the appropriate depth and torque.
Rebar was then tied into the pile caps, concrete poured, and the construction on Jiffy Lube would be successfully completed.

Results

Here in New Brunswick, and especially Moncton, we're no strangers to swampy and wet soil conditions. In this Jiffy Lube project, conditions were so poor that even trucking-in loads of fill wasn't enough to create a stable platform for construction. When it comes to building a reliable foundation on saturated soil, the only real option is to go deeper into the earth to find better conditions.
Because our team at Postech Moncton bypassed the poorly-supportive surface layers and anchored into firm stratum, the concrete beams poured on-top aren't relying on the weak soil to support them. They rest on a strong, durable, and unshakeable deep foundation that will protect against any sinking or shifting.
Other solutions for this project, like concrete, would have involved extensive excavation, dewatering, and sleeving. This type of work can increase the costs and timeline for construction by a significant margin, in addition to concerns about long-term concrete performance in saturated conditions.
The helical screw pile solution we delivered required no excavation, dewatering, or sleeving. Our steel galvanized piles will effectively resist corrosion or decay and they will not heave or sink during the freeze/thaw cycle. In short, they'll do what every good foundation should: stand strong.

Benefits

  • Overcame swampy and muddy conditions that threatened project

  • Avoided extensive excavation and concrete work

  • Empirical relationship between capacity and torque ensures accuracy, safety, and quality

  • Easily tied helical screw piles into rebar for concrete beams

  • Saved enormous time and money compared to other solutions

  • Client can have confidence in foundation performance for decades to come

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