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Faster construction Building on weak soil sites High-capacity
applications Limited-access installation Underpinning foundations
New construction foundations Authorized installationcontractors are
trained and certified by CHANCE Co.
Patented
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History of CHANCE in Civil Construction. . . standard
construction practices to build onOver 95 years of Chance
engineering research anddevelopment have brought the unique
advantages of helicalanchors to meet today's construction
challenges.
CHANCE is the world leader in screw anchor technology.Regardless
of the application, CHANCE products and methods areefficient and
predictable. They give a cost-effective alternatives totraditional
construction methods.
CHANCE helical anchors extend bearing plates into stable
strataunder soft, loose or expansive surface soils without
significantdisturbance.
HELICAL PIER Foundaton Systems:Underpinning & New
Construction Foundations
Retaining Wall Tieback Anchors
Pipeline BouyancyControl Systems
Soil Nailing with Soil Screw Retention Wall System
2
GroutReservoir
Neat Cement Grout(Very Flowable)
ExtensionDisplacement Plate
SS (Square Shaft)Extension
Helix BearingPlates
LeadDisplacement Plate
SubstationFoundations
Telecom TowerFoundations &Guy Anchors
TransmissionTowerFoundations
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Speed Ease High CapacityThe HELICAL PULLDOWN Micropile also
develops additional capacityby combining both end-bearing on the
helical plates and skin frictionalong the rough surface of the
grout column. The result is a highercapacity pile system.
The HELICAL PULLDOWN Micropile could be just the Deep
FoundationSolution youre looking for. . .put it to work on your
next project.
ContentsNewConstruction
3
Underpinning
TelecomTowers
Page
5Page
6
SubstationPage
6
ExtensiveTesting
Page
7
InstallationEquipment
Page
7
The HELICAL PULLDOWN Micropile is a system for constructing
agrout column around the shaft of a standard HELICAL PIERFoundation
Systems pile.To begin the process, a screw anchor is placed into
the soil by applyingtorque to the shaft. The helical shape of the
bearing plates creates atremendous pulling force that keeps the
anchor advancing downwardinto the soil. After the lead section with
the helical plates penetrates thesoil, a Lead Displacement Plate
and Extension are bolted onto theshaft. Resuming torque on the
assembled shaft advances the helicalplates and pulls the
displacement plate downward, forcing soil outwardto create a
cylindrical void around the shaft. From a reservoir at thesurface,
a flowable grout immediately fills this void, surrounding
andencapsulating the shaft. Additional extensions and displacement
platesare added until the helical bearing plates reach competent
load-bearingsoil. This displacement pile system does not require
removing spoilsfrom the site.Benefits of this system include:
Resistance to buckling in weak surface soils Stiffer pile (deflects
less at a particular load) Additional corrosion protection in
aggressive soils
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4
Higher load capacities than ever now areachievable by the
patented HELICAL PULLDOWN Micropiletechnology. It continues to
overcome obstacles to traditionalfoundation methods for a growing
number of applications.
What is aHELICAL PULLDOWNMicropile?
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Installing a (4) helix lead-section. Installing an extension
withLead Displacement Plateand PVC grout reservoir.
Installing additionalextensions through thePVC reservoir.
Cutting the extension to therequired elevation.
An excavator with torque motor installs a row of HELICALPULLDOWN
Micropiles to support a new building.
Helical lead sections have been installed.Extensions with a Lead
Displacement Plateare ready for installation with grout
reservoir.
Installion of grout reservoir.
Adding more groutto the reservoir
Monitoring torque duringinstallation confirms
bearingcapacity.
Pulling out the groutreservoir afterreaching thespecified
torque.
A HELICAL PULLDOWNMicropile is a displacementpile that forces
soil out aroundthe shaft. The void is filledwith grout.
Topping up themicropile with grout.
New Foundation ConstructionTypicalProject A
4
TypicalProject B New Foundation Construction
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Failing shear-wall foundations were causing distress to the
structure.
Preparing the footing for a HELICAL PULLDOWN Micropile.
Mixing grout and adding it to a micropile.
Adding an extension to get to founding depth and installing a
repairbracket. The PVC casing minimizes negative down-drag
forces.
5
Underpinning Restoring a Settled Foundation
5
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Telecommunication Tower Foundations
SubstationFoundations
72' 2"TotalDepth
23' 10"10' GroutColumn
17' 0"8' GroutColumn
14' 0"7' GroutColumn
16' 8"SS175 w/(5) 14"Helices
6
HELICALPULLDOWN
MicropileDetail
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Installation of the micropile is completed quickly and easily
with ahydraulic torque motor mounted on readily available
equipment.Challenging sites, even with limited access, are overcome
with theHELICAL PULLDOWN Micropile.
HELICAL PULLDOWN Micropile:Tested to 205 tons
Close-up of HELICALPULLDOWN Micropileextracted from clay
soil
HELICAL PULLDOWNMicropile extracted forvisual inspection
Extensive Load Testing
Standard Construction Equipment
7
Cross-sectionof extractedmicropile
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NOTE: Because Hubbell has a policy of continuous product
improvement, we reserve the right to change design and
specifications without notice.
Printed in U.S.A. Copyright 2002 Hubbell / Chance10M RGS
01/02
ISO 9001-1994Cert. No. 001136
A. B. Chance Co.Centralia, MO USA
Bulletin 01-0201
To locate a Certified Installer in your local area,consult our
Distributor Network listed onhttp://www.hubbell.com/abchance
ANDERSON Hubbell Power Systems, Inc.
UNITED STATESHUBBELL POWER SYSTEMS, INC.210 N. AllenCentralia,
Mo 65240Phone: 573-682-8414Fax: 573-682-8660e-mail:
[email protected]
CANADAHUBBELL CANADA, INC.870 Brock Road SouthPickering, Ontario
L1W 1Z8Phone: 905-839-1138Fax: 905-831-6353e-mail:
[email protected]
EUROPEHUBBELL POWER SYSTEMSRonald CloseWoburn Road Industrial
EstateKempston, BedfordMK42 7SH, EnglandPhone: 44-1-234-843632Fax:
44-1-234-841435e-mail: [email protected]
MEXICOHUBBELL DE MEXICO, S.A. DE. CVAv. Coyoacan No. 1051Col.
Del Valle03100 Mexico, D.F.Phone: 525-575-2022Fax:
525-559-8626e-mail: [email protected]
ASIAHUBBELL S.E. ASIA PTE. LTD.159 Sin Ming Road#05-08 Amtech
BuildingSingapore 575625Phone: 65-4544772Fax: 65-4544775e-mail:
[email protected]
E-mail: [email protected]
