Commercial Foundation Repair in IA, IL and MO, including Peoria, Pekin & Quincy.

Commercial Push Pier Systems

Foundation Underpinning in Iowa, Illinois, and Missouri

Commercial Push Pier Installation in Kahoka, Missouri

The Supportworks Push Pier System utilizes high-strength round steel tubes and a load transfer bracket (retrofit foundation repair bracket) to stabilize and/or lift sinking or settling foundations. The foundation bracket is secured against the existing footing and pier sections are driven hydraulically through the foundation bracket and into the soil below using the combined structural weight and any contributory soil load as resistance. Pier sections are continuously driven until a suitable load-bearing stratum is encountered. At that point, the structure either begins to lift or the target pressure/load is achieved. The weight of the structure is then transferred from the unstable soil, to the foundation brackets, through the piers, and to firm load-bearing soil or bedrock.

The Supportworks Push Pier System develops a factor of safety against pier settlement by the pier installation methods used and the sequence with which multiple piers are driven and then re-loaded. Piers are first driven individually using the maximum weight of the structure and any contributory soil load. After all of the piers are driven, the piers are re-loaded simultaneously, and the total reaction load is distributed over the multiple pier locations. Since the average load on each pier during the load transfer operation is less than the load during pier installation/driving, a factor of safety against settlement is achieved. Typical factors of safety against pier settlement range from about 1.5 to 3.0, with higher values generally achieved for structures with greater rigidity. These factors of safety conservatively ignore any additional long-term frictional component to the pier’s capacity (see below for more information).

Supportworks Model 288 Pier System Specifications

  • Bracket: Weldment manufactured from 0.25", 0.375", and 0.50"-thick steel plate. Yield strength = 36 ksi (min.), tensile strength = 58 ksi (min.).
  • External Sleeve: 3.50" OD x 0.216" wall x 30" or 48" long with sleeve collar welded to one end. Yield strength = 50 ksi (min.), tensile strength = 62 ksi (min.).
  • Pier Starter Tube: 2.875" OD x 0.165" wall x 50" long, triple-coated in-line galvanized. Yield strength = 50 ksi (min.), tensile strength = 55 ksi (min.). 3.375" OD x 0.188" wall x 1" long friction reducing collar welded to one end.
  • Pier Tube: 2.875" OD x 0.165" wall x 36" long, triple-coated in-line galvanized. Yield strength = 50 ksi (min.), tensile strength = 55 ksi (min.). 2.50" OD x 0.180" wall x 6" long internal coupler at one end with 3" extending out of pier tube.
  • Pier Cap: 5.0" wide x 9.0" long x 1" thick plate with confining ring welded to one side. Yield strength = 50 ksi (min.), tensile strength = 65 ksi (min.).
  • All-Thread Rod: 0.75" diameter x 16" long, zinc plated, Grade B7, tensile strength = 125 ksi [min.].

-- View Our Push Pier System Product Specifications document --

Supportworks Model 288 Capacity Summary

Soil Strength Parameters(2)

Allowable System Capacity(1,2,3,4,5) (kips)

Allowable System Capacity(1,2,3,4,5) (kips)

Soil Type

Consistency/
Relative Denisty

SPT, N-Value

Cohesion (psf)

Friction Angle (degrees)

48" Ext. Sleeve

30" Ext. Sleeve

Clay

Very Soft

< 2

< 250

-

23.5

19.2

Clay

Soft

2-3

250-500

- 27.0

21.5

Clay

Medium Stiff

4-7

501-1,000

-

32.0

23.9

Clay

Stiff

8-15

1,001-2,000

-

34.5

26.9

Clay

Very Stiff

16-31

2,001-4,000

-

34.5

30.8

Sand

Very Loose

< 3

-

26-30

33.0

24.2

Sand

Loose

4-9

-

28-34

33.0

24.2

Sand

Medium

10-29

-

30-36

34.0

26.3

Sand

Dense

30-39

-

34-40

34.5

27.2

(1) ‐ Retrofit brackets shall be used for support of structures that are considered to be fixed from translation. Structures that are not fixed from translation shall be braced in some other manner prior to installing retrofit bracket systems.

(2) ‐ Allowable capacities are based on continuous lateral soil confinement in soils with SPT blow counts as listed. Piles with exposed unbraced lengths or piles placed in fluid soils should be evaluated on a case by case basis by the project

(3) ‐ Allowable capacities consider a loss in steel thickness due to corrosion. Scheduled thickness losses are for a period of 50 years and are in accordance with ICC‐ES AC358.

(4) ‐ Allowable capacities assume a concrete footing with a minimum compressive strength (f'c) = 2,500 psi.

(5) ‐ Allowable capacities with FS350BV retrofit bracket.

-- View Our Push Pier System Product Specifications document --

Supportworks Model 350 Pier System Specifications

  • Bracket: Weldment manufactured from 0.38”, 0.50”, and 0.63” thick steel plate, Yield strength = 36 ksi (min.), tensile strength = 58 ksi (min.).
  • External Sleeve: Ø4.000” x 0.226” wall x 48” long with sleeve collar welded to one end. Yield strength = 50 ksi (min.), tensile strength = 62 ksi (min.).
  • Pier Starter Tube:Ø3.500” x 0.165” wall x 50” long, triple-coated in-line galvanized. Yield strength = 50 ksi (min.), tensile strength = 55 ksi (min.). Ø4.000” x 0.226” wall x 1” long friction reducing collar welded to one end.
  • Pier Tube: Ø3.500” x 0.165” wall x 36” long, triple-coated in-line galvanized. Yield strength = 50 ksi (min.), tensile strength = 55 ksi (min.). Ø3.125” x 0.180” wall x 6” long internal coupler at one end with 3” extending out of pier tube.
  • Pier Cap: 4.00” wide x 8.50” long x 1.25” thick plate with pier locator plate welded to one side. Yield strength = 50 ksi (min.), tensile strength = 65 ksi (min.).
  • All-Thread Rod: Ø7/8” x 18” long, zinc plated. Grade B7, tensile strength = 125 ksi (min.).

-- View Our Push Pier System Product Specifications document --

Supportworks Model 350 Capacity Summary

Soil Strength Parameters(2)

Allowable System Capacity (1,2,3,4,5) (kips)

Soil Type

Consistency/Relative Density

SPT, N-value (blows/ft)

Cohesion (psf)

Friction Angle (degrees)

Clay

Very Soft

< 2

< 250

-

32.5

Clay

Soft

2-3

250-500

- 36.5

Clay

Medium Stiff

4-7

501-1,000

-

41.5

Clay

Stiff

8-15

1,001-2,000

-

43.5

Clay

Very Stiff

16-31

2,001-4,000

-

43.5

Sand

Very Loose

< 3

-

26-30

43.5

Sand

Loose

4-9

-

28-34

43.5

Sand

Medium

10-29

-

30-36

44.0

Sand

Dense

30-39

-

34-40

44.0

(1) ‐ Retrofit brackets shall be used for support of structures that are considered to be fixed from translation. Structures that are not fixed from translation shall be braced in some other manner prior to installing retrofit bracket systems.

(2) ‐ Allowable capacities are based on continuous lateral soil confinement in soils with SPT blow counts as listed. Piles with exposed unbraced lengths or piles placed in fluid soils should be evaluated on a case by case basis by the project

(3) ‐ Allowable capacities consider a loss in steel thickness due to corrosion. Scheduled thickness losses are for a period of 50 years and are in accordance with ICC‐ES AC358.

(4) ‐ Allowable capacities assume a concrete footing with a minimum compressive strength (f'c) = 2,500 psi.

(5) ‐ Allowable capacities with FS350BV retrofit bracket.

-- View Our Push Pier System Product Specifications document --

Supportworks Model 400 Pier System Specifications

  • Bracket: Weldment manufactured from steel plates with integrated pipe sleeve. Steel plate: 0.38” and 0.50” thick steel plate, yield strength = 36 ksi (min.), tensile strength = 58 ksi (min.). Pipe sleeve: Ø4.50” x 0.237” wall x 14.50” long. ASTM A53 Grade B Type E & S, yield strength = 35 ksi (min.), tensile strength = 60 ksi (min.).
  • Pier Starter Tube:Ø4.00” x 0.226” wall x 36” long. ASTM A500 Grade B or C, yield strength = 50 ksi (min.), tensile strength = 62 ksi (min.). Ø4.50” x 0.237” wall x 1” long friction reducing collar welded to one end.
  • Pier Tube:Ø4.00” x 0.226” wall x 36” long. ASTM A500 Grade B or C, yield strength = 50 ksi (min.), tensile strength = 62 ksi (min.). Ø3.50” x 0.216” wall x 8” long internal coupler at one end with 4” extending out of pier tube.
  • Pier Cap: 4.00” wide x 8.50” long x 1.25” thick plate with pier locator plate welded to one side. ASTM A572 Grade 50, yield strength = 50 ksi (min.), tensile strength = 65 ksi (min.). All-Thread Rod: Ø0.875” x 18” long, zinc plated. ASTM A193 Grade B7, tensile strength = 125 ksi (min.).

-- View Our Push Pier System Product Specifications document --

Supportworks Model 400 Capacity Summary

Allowable System Capacity: 39,000 lbs. (with FS400BV Bracket)

Notes:

1.Retrofit brackets shall be used for support of structures that are considered to be fixed from translation. Structures that are not fixed from translation shall be braced in some other manner prior to installing retrofit bracket systems.

2.Concrete bearing assumes a minimum compressive strength (f’c) of 2,500 psi. Local concrete bending and other local design checks should be evaluated on a case by case basis by the project engineer.

3.Mechanical capacity is based on continuous lateral soil confinement in soils with SPT blow counts ≥ 4. Piles with exposed unbraced lengths or piles placed in weaker or fluid soils should be evaluated on a case by case basis by the project engineer.

-- View Our Push Pier System Product Specifications document --

Design Considerations

push pier installation

Push piers are installed directly adjacent to the existing structure utilizing side-load brackets. This introduces eccentricity into the system. The Model 288 Push Pier System incorporates an external sleeve at the top of the pier to aid in resisting the bending forces generated by this loading condition. This helps preserve the axial compressive capacity of the pier shaft. The external sleeve extends through and below the foundation bracket to essentially create a bracket that is 48 inches tall.

The moment or bending force is localized within a relatively short distance below the bracket. Although the bending force is dissipated quickly by the pier bearing against the confining soil, it is significant and cannot be ignored. The depth or length of sleeve and pier over which the bending force dissipates is a function of the soil stiffness near the surface. The depth is greater in soft clay and loose sand, and less in stiff clay and dense sand. In soft or loose soils, a small portion of the bending force may be transferred to the pier below the sleeve, thereby reducing the pier’s allowable axial compressive capacity. A modified, lower capacity system is also available with a shorter, 30-inch long sleeve for low headroom applications.

Friction Reducing Collar

The first pier section advanced into the ground includes a larger-diameter "friction reducing collar" welded to the lead end. This collar, being larger in diameter than the pier tube, effectively creates annular space around the pier as it is advanced through most clayey soils. In soft clay or clean sand and gravel, an annular space may only temporarily be created. However, the larger diameter collar causes soil disturbance or remolding to occur, which also significantly reduces frictional resistance on the outside surface of the pier during driving. The result is a driven pier that generates most of its capacity in endbearing. Over time, the soils surrounding the pier relax back into the annular space and against the pier shaft. This provides an additional frictional component to the pier’s capacity. Even though this frictional capacity may be significant, it is conservatively ignored in the determination of the pier’s factor of safety against pier settlement.

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Cities in Des Moines County, IA
Burlington
Danville
Mediapolis
Middletown
Sperry
West Burlington
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Cities in Henry County, IA
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Birmingham
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Keosauqua
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Cities in Adams County, IL
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Fowler
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Liberty
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Mendon
Paloma
Payson
Plainville
Quincy
Ursa

Cities in Brown County, IL
Mount Sterling
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Cities in Dewitt County, IL
Farmer City
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Cities in Ford County, IL
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Cities in Fulton County, IL
Astoria
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Cities in Hancock County, IL
Augusta
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Bowen
Carthage
Colusa
Dallas City
Elvaston
Ferris
Hamilton
La Harpe
Nauvoo
Niota
Sutter
Warsaw
West Point

Cities in Henderson County, IL
Biggsville
Carman
Gladstone
Lomax
Media
Oquawka
Raritan
Stronghurst

Cities in Iroquois County, IL
Ashkum
Beaverville
Buckley
Chebanse
Cissna Park
Clifton
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Danforth
Donovan
Gilman
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Martinton
Milford
Onarga
Sheldon
Thawville
Watseka
Wellington

Cities in Knox County, IL
Abingdon
Altona
Dahinda
East Galesburg
Galesburg
Gilson
Knoxville
Maquon
Oneida
Rio
Saint Augustine
Victoria
Wataga
Williamsfield
Yates City

Cities in La Salle County, IL
Dana
Earlville
Grand Ridge
La Salle
Leland
Lostant
Marseilles
Mendota
Oglesby
Ottawa
Peru
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Rutland
Seneca
Serena
Sheridan
Streator
Tonica
Utica

Cities in Livingston County, IL
Ancona
Blackstone
Chatsworth
Cornell
Cullom
Dwight
Emington
Fairbury
Flanagan
Forrest
Graymont
Long Point
Odell
Pontiac
Saunemin
Strawn

Cities in Logan County, IL
Atlanta
Emden
Hartsburg
New Holland

Cities in Mason County, IL
Bath
Easton
Forest City
Havana
Kilbourne
Manito
Mason City
San Jose
Topeka

Cities in Mcdonough County, IL
Adair
Bardolph
Blandinsville
Bushnell
Colchester
Good Hope
Industry
Macomb
Prairie City
Sciota
Tennessee

Cities in Mclean County, IL
Anchor
Arrowsmith
Bellflower
Bloomington
Carlock
Chenoa
Colfax
Cooksville
Cropsey
Danvers
Downs
Ellsworth
Gridley
Heyworth
Hudson
Le Roy
Lexington
Mc Lean
Normal
Saybrook
Shirley
Stanford
Towanda

Cities in Schuyler County, IL
Browning
Camden
Frederick
Huntsville
Littleton
Plymouth
Rushville

Cities in Tazewell County, IL
Armington
Creve Coeur
Deer Creek
Delavan
East Peoria
Green Valley
Groveland
Hopedale
Mackinaw
Minier
Morton
Pekin
South Pekin
Tremont
Washington

Cities in Warren County, IL
Berwick
Cameron
Gerlaw
Kirkwood
Little York
Monmouth
Roseville
Smithshire

Cities in Woodford County, IL
Benson
Congerville
El Paso
Eureka
Goodfield
Lowpoint
Metamora
Minonk
Roanoke
Secor

Cities in Adair County, MO
Brashear
Gibbs
Greentop
Kirksville
Novinger

Cities in Chariton County, MO
Brunswick
Dalton
Keytesville
Mendon
Rothville
Salisbury
Sumner
Triplett

Cities in Clark County, MO
Alexandria
Kahoka
Luray
Revere
Saint Patrick
Wayland
Wyaconda

Cities in Knox County, MO
Baring
Edina
Hurdland
Knox City
Newark
Novelty
Plevna

Cities in Lewis County, MO
Canton
Durham
Ewing
La Belle
La Grange
Lewistown
Monticello
Williamstown

Cities in Linn County, MO
Brookfield
Browning
Bucklin
Laclede
Linneus
Marceline
Meadville
New Boston
Purdin

Cities in Macon County, MO
Anabel
Atlanta
Bevier
Callao
Elmer
Ethel
Excello
La Plata
Macon
New Cambria

Cities in Marion County, MO
Hannibal
Maywood
Palmyra
Philadelphia
Taylor

Cities in Monroe County, MO
Holliday
Madison
Monroe City
Paris
Santa Fe
Stoutsville

Cities in Putnam County, MO
Livonia
Lucerne
Powersville
Unionville
Worthington

Cities in Ralls County, MO
Center
New London
Perry
Saverton

Cities in Randolph County, MO
Cairo
Clark
Clifton Hill
Higbee
Huntsville
Jacksonville
Moberly
Renick

Cities in Schuyler County, MO
Coatsville
Downing
Glenwood
Lancaster
Queen City

Cities in Scotland County, MO
Arbela
Gorin
Granger
Memphis
Rutledge

Cities in Shelby County, MO
Bethel
Clarence
Emden
Hunnewell
Lentner
Leonard
Shelbina
Shelbyville

Cities in Sullivan County, MO
Green Castle
Green City
Harris
Humphreys
Milan
Newtown
Pollock
Winigan

Our Locations:

Foundation Supportworks of the Tri States
8910 N. Industrial Rd.
Peoria, IL 61615
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