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Lesage
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Ona
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Bomont
Clay
Dille
Duck
Glen
Indore
Ivydale
Lizemores
Maysel
Nebo
Procious
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Widen

Cities in Doddridge County, WV
Center Point
New Milton
Smithburg
West Union

Cities in Fayette County, WV
Alloy
Ansted
Boomer
Cannelton
Charlton Heights
Danese
Deep Water
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Edmond
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Glen Jean
Hico
Hilltop
Kanawha Falls
Kimberly
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Lansing
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Lochgelly
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Minden
Montgomery
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Oak Hill
Page
Pax
Powellton
Prince
Robson
Scarbro
Smithers
Spring Dale
Thurmond
Victor
Winona

Cities in Gilmer County, WV
Cedarville
Coxs Mills
Glenville
Linn
Normantown
Rosedale
Sand Fork
Shock
Troy

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Cabins
Gormania
Lahmansville
Maysville
Mount Storm
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Asbury
Caldwell
Charmco
Crawley
Fairlea
Frankford
Grassy Meadows
Leslie
Lewisburg
Maxwelton
Quinwood
Rainelle
Renick
Ronceverte
Rupert
Smoot
White Sulphur Springs
Williamsburg

Cities in Hampshire County, WV
Augusta
Bloomery
Capon Bridge
Delray
Green Spring
High View
Levels
Points
Purgitsville
Rio
Romney
Shanks
Slanesville
Springfield
Yellow Spring

Cities in Hardy County, WV
Baker
Fisher
Lost City
Mathias
Milam
Moorefield
Old Fields
Wardensville

Cities in Harrison County, WV
Anmoore
Bridgeport
Clarksburg
Enterprise
Gypsy
Haywood
Hepzibah
Lost Creek
Lumberport
Meadowbrook
Mount Clare
Reynoldsville
Salem
Shinnston
Spelter
Wallace
West Milford
Wyatt

Cities in Jackson County, WV
Advent
Cottageville
Evans
Gay
Given
Kenna
Le Roy
Millwood
Ravenswood
Ripley
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Cities in Jefferson County, WV
Charles Town
Harpers Ferry
Kearneysville
Ranson
Shenandoah Junction
Summit Point

Cities in Kanawha County, WV
Alum Creek
Belle
Blount
Blue Creek
Cabin Creek
Cedar Grove
Charleston
Clendenin
Dawes
Drybranch
Dunbar
East Bank
Elkview
Eskdale
Falling Rock
Gallagher
Glasgow
Handley
Hansford
Hernshaw
Hugheston
Institute
London
Mammoth
Miami
Nitro
Pinch
Pond Gap
Pratt
Saint Albans
Tad
Tornado
Winifrede

Cities in Lewis County, WV
Alum Bridge
Camden
Crawford
Horner
Ireland
Jane Lew
Orlando
Walkersville
Weston

Cities in Lincoln County, WV
Alkol
Branchland
Griffithsville
Hamlin
Harts
Midkiff
Myra
Ranger
Sod
Spurlockville
Sumerco
West Hamlin
Yawkey

Cities in Logan County, WV
Accoville
Amherstdale
Big Creek
Blair
Bruno
Chapmanville
Chauncey
Clothier
Cora
Davin
Ethel
Henlawson
Holden
Kistler
Lake
Logan
Lorado
Lyburn
Mallory
Man
Mount Gay
Omar
Peach Creek
Pecks Mill
Sarah Ann
Sharples
Stollings
Switzer
Verdunville
Whitman
Wilkinson
Yolyn

Cities in Marion County, WV
Baxter
Carolina
Colfax
Fairmont
Fairview
Farmington
Four States
Idamay
Kingmont
Mannington
Rachel
Rivesville
Worthington

Cities in Mason County, WV
Apple Grove
Ashton
Gallipolis Ferry
Glenwood
Hartford
Henderson
Leon
Letart
Mason
Mount Alto
New Haven
Point Pleasant
Southside
West Columbia

Cities in Mcdowell County, WV
Anawalt
Avondale
Bartley
Berwind
Big Sandy
Bradshaw
Cucumber
Davy
Eckman
Elbert
Elkhorn
Gary
Hensley
Iaeger
Isaban
Jenkinjones
Jolo
Kimball
Kyle
Maybeury
Mohawk
Newhall
Northfork
Pageton
Panther
Paynesville
Premier
Raysal
Roderfield
Squire
Switchback
Thorpe
War
Warriormine
Welch
Wilcoe

Cities in Mercer County, WV
Athens
Beeson
Bluefield
Bramwell
Camp Creek
Flat Top
Freeman
Hiawatha
Kegley
Kellysville
Lashmeet
Lerona
Matoaka
Montcalm
Nemours
Princeton
Rock
Spanishburg
Wolfe

Cities in Mineral County, WV
Burlington
Elk Garden
Fort Ashby
Keyser
New Creek
Piedmont
Ridgeley
Wiley Ford

Cities in Mingo County, WV
Baisden
Borderland
Breeden
Chattaroy
Delbarton
Dingess
Edgarton
Gilbert
Justice
Kermit
Lenore
Matewan
Naugatuck
Newtown
North Matewan
Ragland
Rawl
Red Jacket
Varney
Verner
Wharncliffe
Williamson

Cities in Monongalia County, WV
Morgantown

Cities in Monroe County, WV
Alderson
Ballard
Gap Mills
Greenville
Lindside
Peterstown
Secondcreek
Sinks Grove
Union
Waiteville
Wayside
Wolfcreek

Cities in Morgan County, WV
Berkeley Springs
Great Cacapon
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Cities in Nicholas County, WV
Belva
Birch River
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Canvas
Craigsville
Dixie
Drennen
Fenwick
Gilboa
Keslers Cross Lanes
Leivasy
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Mount Nebo
Nettie
Pool
Richwood
Summersville
Swiss
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Cities in Pendleton County, WV
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Riverton
Seneca Rocks
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Cass
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Cities in Preston County, WV
Aurora
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Kingwood
Newburg
Rowlesburg
Terra Alta
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Cities in Putnam County, WV
Bancroft
Buffalo
Eleanor
Fraziers Bottom
Hometown
Hurricane
Liberty
Poca
Red House
Scott Depot
Teays
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Cities in Raleigh County, WV
Arnett
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Beaver
Beckley
Bolt
Bradley
Clear Creek
Coal City
Colcord
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Daniels
Dorothy
Dry Creek
Eccles
Fairdale
Ghent
Glen Daniel
Glen White
Harper
Helen
Josephine
Lanark
Lester
Mabscott
Mac Arthur
Midway
Naoma
Odd
Piney View
Princewick
Prosperity
Raleigh
Rhodell
Rock Creek
Saxon
Shady Spring
Skelton
Slab Fork
Sophia
Stanaford
Surveyor
White Oak

Cities in Randolph County, WV
Beverly
Bowden
Coalton
Dailey
Dryfork
Elkins
Ellamore
Glady
Harman
Helvetia
Huttonsville
Kerens
Mabie
Mill Creek
Monterville
Montrose
Norton
Pickens
Valley Bend
Valley Head
Whitmer

Cities in Ritchie County, WV
Auburn
Berea
Cairo
Ellenboro
Harrisville
Macfarlan
Pennsboro
Petroleum
Pullman
Smithville

Cities in Roane County, WV
Amma
Gandeeville
Left Hand
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Newton
Reedy
Spencer
Walton

Cities in Summers County, WV
Forest Hill
Green Sulphur Springs
Hinton
Jumping Branch
Meadow Creek
Nimitz
Pence Springs
Pipestem
Sandstone
Talcott

Cities in Taylor County, WV
Flemington
Grafton
Rosemont
Simpson
Thornton

Cities in Tucker County, WV
Davis
Hambleton
Hendricks
Parsons
Red Creek
Thomas

Cities in Tyler County, WV
Alma
Friendly
Middlebourne
Shirley
Sistersville

Cities in Upshur County, WV
Adrian
Buckhannon
Cleveland
French Creek
Frenchton
Kanawha Head
Lorentz
Rock Cave
Selbyville
Tallmansville

Cities in Wayne County, WV
Ceredo
Crum
Dunlow
East Lynn
Fort Gay
Genoa
Huntington
Kenova
Kiahsville
Lavalette
Prichard
Shoals
Wayne
Wilsondale

Cities in Webster County, WV
Bergoo
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Diana
Erbacon
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Upperglade
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Folsom
Jacksonburg
New Martinsville
Paden City
Pine Grove
Porters Falls
Reader
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Cities in Wirt County, WV
Brohard
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Elizabeth
Palestine

Cities in Wood County, WV
Belleville
Davisville
Mineral Wells
Parkersburg
Rockport
Vienna
Walker
Washington
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Cities in Wyoming County, WV
Allen Junction
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Bud
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Cyclone
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Herndon
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Itmann
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Simon
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Please call us at: 1-800-406-1981

Commercial Helical Anchors / Tiebacks

Screw Anchor and Soil Nailing in West Virginia

Helical Anchors (also referred to as tiebacks) provide lateral stability to foundation walls and retaining walls with unbalanced earth pressures. Helical anchors can be installed with hand-held equipment, mini-excavators, skid steers, backhoes, trackhoes, or crane-supported rigs so the anchors can be installed in almost any application. This versatility, along with the ability to immediately load and test the anchors, make helicals a convenient and economical solution for a wide variety of projects. helical tiebacks in West Virginia

ADVANTAGES

Predictable capacity
Helix blade configuration selected to achieve design embedment and capacity
All-weather installation
Can be installed in areas of limited or tight access
Installation does not generate spoils
Clean installation with no messy grout
Load tests can be performed immediately following installation
Available with optional hot-dip galvanizing for added corrosion protection

Design Considerations

Helical anchors are a factory-manufactured steel foundation system consisting of a central shaft with one or more helix-shaped bearing plates, commonly referred to as blades, welded to the lead section. Extension shafts, with or without additional helix plates, are used to extend the anchor into competent load-bearing soils. Helical anchors are advanced ("screwed") into the ground with the application of torque.

The terms helical piles, screw piles, helical piers, helical anchors, helix piers, and helix anchors are often used interchangeably by specifiers. However, the term "pier" more often refers to a helical foundation system loaded in axial compression, while the term "anchor" more often refers to a helical foundation system loaded in axial tension.

Determination of Capacity
Anchor Capacity
Model 150
Model 175

Determination of Capacity

The ultimate capacity of a helical anchor may be calculated using the traditional bearing capacity equation:

Q_u = ∑ [A_h (cN_c + qN_q)]

Where:

Q_u	=	Ultimate Anchor Capacity (lb)
A_h	=	Area of Individual Helix Plate (ft²)
c	=	Effective Soil Cohesion (lb/ft²)
N_c	=	Dimensionless Bearing Capacity Factor = 9
q	=	Effective Vertical Overburden Pressure (lb/ft²)
N_q	=	Dimensionless Bearing Capacity Factor

Total stress parameters should be used for short-term and transient load applications and effective stress parameters should be used for long-term, permanent load applications. A factor of safety of 2 is typically used to determine the allowable soil bearing capacity, especially if torque is monitored during the helical anchor installation.

Like other deep foundation alternatives, there are many factors to be considered in designing a helical anchor foundation. Foundation Supportworks™ recommends that helical anchor design be completed by an experienced geotechnical engineer or other qualified professional.

Another well-documented and accepted method for estimating helical anchor capacity is by correlation to installation torque. In simple terms, the torsional resistance generated during helical anchor installation is a measure of soil shear strength and can be related to the bearing capacity of the anchor.

Q_u = KT

Where:

Q_u	=	Ultimate anchor Capacity (lb)
K	=	Capacity to Torque Ratio (ft^-1)
T	=	Installation Torque (ft-lb)

The capacity to torque ratio is not a constant and varies with soil conditions and the size of the anchor shaft. Load testing using the proposed helical anchor and helix blade configuration is the best way to determine project-specific K-values. However, ICC-ES AC358 provides default K-values for varying anchor shaft sizes, which may be used conservatively for most soil conditions. The default value for the Model 150 Helical Anchor System (1.50" square shaft) is K = 10 ft^-1.

-- View Our Helical Anchors and Tiebacks Product Specifications document --

Anchor Capacity

The cross section of a square shaft is very compact which can allow the anchor to penetrate more easily through the soil. This compact shape also reduces the stiffness of the cross section and introduces more potential for buckling. These two factors make square shaft helical anchors better suited for tension loads. Foundation Supportworks™, Inc. therefore recommends their use mainly for these types of applications. Square shaft helical anchors (piles) used in compression should be evaluated on a case by case basis by the project engineer.

Mechanical Axial Capacity (see note):

Allowable Tension = 26.5 kips*

* The mechanical tensile capacity of the Model 150 Helical Anchor System is limited by the allowable stress levels dictated by AISC for a high strength bolt in double shear. The allowable tensile capacity of the shaft is actually much higher than this Allowable Tension value.

Torque Limited Axial Design Capacities based on Ultimate Torsional
Resistance of Anchor Shaft = 6,340 ft-lbs**:

Ultimate Soil Capacity = 63.4 kips** (with K = 10 ft-1, see note)

Allowable Soil Capacity = 31.7 kips (FOS = 2, Allowable System Capacity therefore governed by mechanical capacity = 26.5 kips*)

** This Ultimate Torsional Resistance and its corresponding Torque Limited Capacities are based on laboratory test results from an IAS accredited facility and may only be approached in idealized conditions. Plastic torsional deformations can begin in the anchor shaft near 4,600 ft-lbs. This value may be reached and exceeded in the field by maintaining alignment between the anchor and the drive head, limiting impact forces and torque reversal, and reducing the tendency to "crowd" (push down on) the anchor. Installation through soils with obstructions or high variability may result in impact loading on the anchor. In these cases, achieving high torque values becomes more difficult and a further reduction in the Design Torque Limit may be appropriate.

Note

K = 10 ft^-1 is a default value as published in ICC-ES AC358 which can, in many cases, be considered conservative. Higher capacities can often be achieved with site-specific load testing. Allowable capacities based on site testing shall not exceed the Mechanical Axial Capacity.

-- View Our Helical Anchors and Tiebacks Product Specifications document --

Model 150 Helical Anchor System

Outer Dimensions = 1.50" x 1.50"
Anchor Shaft Yield Strength = 90 ksi (min.)
Coupling Hardware: ¾" Grade 8 Bolt with Nut
Available Helix Blade Diameters = 6", 8", 10", 12" and 14"
Helix Blade Thickness = 0.375"
Termination Hardware: 1" Threaded Rod, Tensile Strength = 120 ksi (min.)

-- View Our Helical Anchors and Tiebacks Product Specifications document --

Model 175 Helical Anchor System

Outer Dimensions = 1.75" Round Corner Square Bar
Anchor Shaft Yield Strength = 90 ksi (min.)
Coupling Hardware: (2) ¾" Grade 8 Bolt with Nut
Available Helix Blade Diameters = 6", 8", 10", 12" and 14"
Helix Blade Thickness = 0.375"
Termination Hardware: 1" Threaded Rod, Tensile Strength = 120 ksi (min.)

-- View Our Helical Anchors and Tiebacks Product Specifications document --

Helix Blade Geometry

Foundation Supportworks' helical anchors feature blades manufactured with a true helix shape conforming to the geometry criteria of ICC-ES AC358. The leading and trailing edges of true helix blades are within one-quarter inch of parallel to each other and any radial measurement across the blade is perpendicular to the anchor shaft. A true helix shape along with proper alignment and spacing of the blades is critical to minimize soil disturbance during installation.

Conversely, blades that are not a true helix shape are often formed to a 'duckbill' appearance. These plates create a great deal of soil disturbance and do not conform to the helix geometry requirements of ICC-ES AC358 since their torque to capacity relationships are not well documented.