Model 288 Push Pier System
Technical Specifications
Bracket: Weldment manufactured from 0.25”, 0.38”, and 0.50” thick steel plate, Yield strength = 36 ksi (min.), tensile strength = 58 ksi (min.).
Pier Tube: Ø2.875” x 0.165” wall x 36” long, triple-coated in-line galvanized. Yield strength = 50 ksi (min.), tensile strength = 55 ksi (min.). Ø2.500” x 0.180” wall x 6” long internal coupler at one end with 3” extending out of pier tube.
Pier Starter Tube: Ø2.875” x 0.165” wall x 50” long, triple-coated in-line galvanized. Yield strength = 50 ksi (min.), tensile strength = 55 ksi (min.). Ø3.375” x 0.1.88” wall x 1” long friction reducing collar welded to one end.
External Sleeve: Ø3.500” 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 Cap: 5.00” wide x 9.00” long x 1.00” thick plate with pier locator plate welded to one side. Yield strength = 50 ksi (min.), tensile strength = 65 ksi (min.).
All-Thread Rod: Ø3/4” x 16” long, zinc plated. Grade B7, tensile strength = 125 ksi (min.).
|
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/ |
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.
