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HELICAL & STRUCTURAL SYSTEMS, LLC installs structural foundation support for various clients/projects, including environmental, new construction and repair type projects. Such as house razing/new footings, retaining well construction/repair, sea walls, bulkhead, piers, cell tower installations, solar lighting field installations, bridge, walkway and ramp installations.
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Helical Pile Applications inOil and Gas Industry
by Howard A. Perko, Ph.D., P.E.Magnum Geo-Solutions, LLC
Copyright 2011 – Howard A. Perko, All Rights reserved. May be
distributed and printed by express written permission of the author only.
MAGNUM Informational Bulletin ISO-HAP1-12B
Copyright © 2011 – Howard A. Perko
What is a Helical Pile?
Helical Piles:Central Steel Shaft with One or More Helix Shaped Bearing Elements that is Screwed Into the Ground to Support the Loads of Structures
(a.k.a. Helical Piers, Screw Piles, Torque Anchors, Auger Screw Piles, Helix Piers)
Plate Cap
Extension
Coupling
Lead
Helix
Pitch
Pilot Point
Copyright © 2011 – Howard A. Perko
Bearing Capacity & Sizing
Helical Piles are sized using traditional soil mechanics:
Individual Bearing
Q = R2(1.3cNc+Nq)
Cylindrical Shear
Q = 2RL(c+Ktan) +
R2(1.3cNc+ Nq)
Limit State = Cylindrical Shearor Individual Bearing,whichever is less.
From Perko (2009) Helical Piles
Copyright © 2011 – Howard A. Perko
Why Use Helical Piles?Save Money
Easy to Transport to Remote SitesDoesn’t Produce Drill SpoilMinimal Site Work
Save TimeRapid InstallationNo Concrete CuringSet Platforms Directly on Piles
Proven Technology Invented in 1836Appears in 2009 IBC ISO2009 Accredited Manufacturer
Copyright © 2011 – Howard A. Perko
Gas Compressor Pad
90 tons
Designing the foundations for vibrating machines is not as simple as dividing the weight amongst the piles. The lifespan and maintenance cycle of compressors and other machines is greatly diminished with improper foundation design and excessive vibrations.
Copyright © 2011 – Howard A. Perko
Pipe Rack Foundations
Copyright © 2011 – Howard A. Perko
Compressor Pad Construction
Copyright © 2011 – Howard A. Perko
Completed Compressor Pad
Helical piles saved $100,000 per compressor pad versus conventional heavy reinforced concrete mat. Compressors were started without incident, vibrations were within target levels, and compressors continue to operate without flaw.
Copyright © 2011 – Howard A. Perko
Installation and Load Tests
Load tests passed with good results. Measured 0.28 inches movement at 110 kips design compression and tension loads. Installation was completed on budget and on schedule.
Copyright © 2011 – Howard A. Perko
Installation Photos
MH425 helical piles installed on schedule and on budget.
Copyright © 2011 – Howard A. Perko
Installation Over Water
Installation of helical piles over water helped protect wetlands from risks of silt, spoil, and contaminants.
Copyright © 2011 – Howard A. Perko
Use of Battered Piles
Contractor was able to replace 80 large pre-cast driven piles under this pipeline thrust block with just 20 helical piles by incorporating batter angle to handle lateral loads.
Copyright © 2011 – Howard A. Perko
Pipeline Support
Adjustable caps were used under pipe racks so that bolting could be done instead of welding.
Copyright © 2011 – Howard A. Perko
Limited Site Access
Helical piles installation equipment was able to access areas that drilling and pile driving equipment could not.
Copyright © 2011 – Howard A. Perko
Platform Design
MAGNUM Patent Pending Design created by Magnum Geo-Solutions, LLC to provide harmonic dampening and keep harmonic motion within tolerable limits.
Copyright © 2011 – Howard A. Perko
MAGNUM Quality
Many convenient features including steel plate for electrical, integrated access step, and crane lift points. Meets NEC specifications for grounding.
Copyright © 2011 – Howard A. Perko
Platform Installation
MAGNUM Steel Platform is set in afternoon of same day as helical pile installation. Note same excavator being used to crane 9,000 lb platform in place.
Copyright © 2011 – Howard A. Perko
Pump Unit in Place
Old SchoolPre-Cast New MAGNUM
“Concrete-Less” Pump Platform
Copyright © 2011 – Howard A. Perko
Still Going!
MAGNUM Steel Platform resists frost heave, expansive soils, settlement, and shallow soil shifting. These foundations reduce risk of costly shut-downs.
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