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NEW CONSTRUCTION
REMEDIAL REPAIR
HELICAL PULLDOWN® MICROPILE
SITE PREPARATION
ATLAS RESISTANCE® PIERS
TELECOM/SUBSTATION
UTILITY/SOLAR
RETAINING WALLS
EARTH RETENTION
HELICAL UNDERPINNING
PIPELINE STABILIZATION
SOIL SCREW®
HELICAL TIEBACK
HELICAL FOUNDATION SOLUTIONS
CERTIFIED INSTALLERMASON GRADY FOUNDATIONS
GENERAL CONTRACTOR GREENHUT CONSTRUCTION
STRUCTURAL ENGINEER BERUBE LEONARD
GEOTECHNICAL ENGINEER
NOVA ENGINEERING
Hubbell Power Systems, Inc. is the
world’s leading helical pile/anchor
manufacturer. The CHANCE® brand
offers a technically advanced,
cost effective solution for the Civil
Construction and Electric Utility and
Telecommunications markets.
PROJECT: The YMCA of Northwest Florida had plans to construct a new state of the art facility to replace its existing facility in Pensacola, FL. The new 52,000 square foot building was to contain an indoor, accessible aquatic center with two pools. Plans called for the building and pool foundations to be supported by auger cast piles. The key to the project schedule would be installing the roof system as quickly as possible so that the building would be dried in so that weather could no longer affect the production schedule. In order for this to be accomplished the deep foundations for the pools would need to be installed after the roof was complete. The general contractor, Greenhut Construction, also wanted to perform the pool excavations after the roof was installed to decrease the de-watering period for the pool area, and so that the building would not have to be constructed around the excavation. Greenhut estimated that this would save approximately six (6) weeks of production time. To accomplish this, a high capacity deep foundation was needed that could be installed indoors in a limited access area.
SOLUTION: The CHANCE Helical Pulldown Micropile (HPM) was the perfect fit for this scenario. HUBBELL/CHANCE is the world's leading manufacturer of helical foundation systems. Backed by more than 100 years of engineering experience, the HPM is a technologically advanced, cost effective, high capacity deep foundation system. The HPM is a true composite pile that combines both skin friction and end bearing components to provide much higher capacities than provided by standard helical piles. To view a load test database, please visit the Helical Pile Association website at loadtest.helicalpileassociation.com/
continued
CASE HISTORY
View of the work area
Load Test results
View of the work area
CHANCE Civil Construction | Hubbell Power Systems, Inc. | hubbellpowersystems.com/abchance
©Copyright 2014 Hubbell Incorporated. Because Hubbell has a policy of continuous product
improvement, we reserve the right to change design and specifi cations without notice.
Printed in the U.S.A. | CH_04_067E
CASE HISTORY
Mason Grady Foundations specializes in CHANCE Helical Pile Systems primarily for foundations and retaining walls. The company is the only certified CHANCE installer in the Tallahassee, FL area, we are family owned and operated, and we are a member of the CHANCE Alliance Network.
MASON GRADY FOUNDATIONS LLC GA(229)872-3991 FL (850)688-2005
CHANCE CERTIFICATION #1912-0009-3630
THE WORK
The pools were supported by a total of (36) Helical Pulldown Micropiles. Working loads per pile ranged from 65 to 100 kips in compression and 10 to 65 kips in
tension. Pile depths ranged from 50 to 70 feet in length. Each pile was equipped with a 10" square new construction plate to allow for connection to the new poured
concrete footings. Lead sections consisted of an 8"/10"/12"/14" helix configuration on a SS225 shaft (2-1/4" square). The grout column was 7" in diameter and
provided an additional 3,000 lbs. of capacity per linear foot of grout column. A load test was conducted prior to production pile installation to verify the additional
load that would be achieved by the grout column. All piles were installed to meet the design loads with a minimum factor of safety of two (2). Pile installation was
completed in one (1) 40 hour work week.
Installation equipment - 30K Hydraulic Drive Head,Digital Toque Indicator, 29,000 lb excavator
Helical lead section and lead displacement plate Digital Torque Indicator above displacement plate
Grout reservoir, plain extension shaft, and extension displacement plate
Grout column, and new construction cap
-1.4
-1.3
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-1
-0.9
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-0.5
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0
0 50 100 150 200 250
AXIA
L D
EFLE
CTI
ON
(IN
CH
ES)
AXIAL COMPRESSION (KIP)
Foundation Technologies, Inc. B.J.'s Restaurant - TP-1 - Compression
Helical Pulldown Micropile, SS200 8"x10"x12"x14" Lead Section Total Depth 76', Final Torque 16,000 ft-lbs
PL/AE
PL/AE + 0.08(D)
AVERAGE DEFLECTION
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