Specifications
Shaft Material:
- 1.75" Round Corner Square Bar
- C1530, Yield Strength = 90 ksi (min)
Helix Plates:
- ASTM A36 x 3/8" Thick (Standard)
- ASTM A572 Grade 50 x 3/8" Thick (Available)
- ASTM A572 Grade 50 x 1/2" Thick (Available)
- Helix plate geometry conforming to ICC-ES AC358
Shaft Coupler Material:
- (2) - Ø3/4" Grade 8 Bolts with Nuts
End Termination Hardware (Optional):
- Ø1.25" x 48" long all-thread rod and nut
- Grade 1045SR, Tensile Strength = 120 ksi (min)
- Beveled Washer
Finish:
- Available plain or with hot-dipped galvanized coating
in accordance with ASTM A123.
Helical Pile HA175 Section Properties
|
- Corroded properties based on a 50-year scheduled sacrificial loss in thickness per ICC-ES AC358.
- Hot-dip galvanized coating in accordance with ASTM A123.
|
| |
Plain |
Corroded Plain(1) |
Corroded Galvanized(1,2) |
| t (in) |
1.750 |
1.714 |
1.743 |
| G (in) |
2.268 |
2.232 |
2.261 |
| R (in) |
0.250 |
0.232 |
0.247 |
| A (in2) |
3.01 |
2.89 |
2.99 |
| I x, I (in4) |
0 75 |
0 69 |
0 73 |
| Iz (in4) |
0.75 |
0 69 |
0.73 |
| Sx, Sy (in3) |
0.85 |
0.80 |
0.84 |
| Sz (in3) |
0.66 |
0.62 |
0.65 |
| Zx, Zy(in3) |
1.28 |
1.21 |
1.26 |
| Z z(in3) |
1.31 |
1.24 |
1.30 |
| rx, ry(in3) |
0.50 |
0.49 |
0.50 |
| rz(in3) |
0.50 |
0.49 |
0.50 |
| |
Minimum Yield (ksi) |
Minimum Tensile (ksi) |
| Material Properties |
90 |
115 |
|
| Helical Pile Capacities Summary |
| |
Maximum Allowable Mechanical Shaft Capacities (3,5)
|
| |
Default Torque Correlation Factor (6) Kt (ft-1)
|
Maximum Installation Torque (ft-lbs) |
Maximum Ultimate Torque Correlated Soil Capacity (6,7)Qu = Kt X T
(kips) |
Axial Compression (kips) |
Axial Tension (kips) |
|
HA150
|
10
|
6,500
|
65.0(8)
|
26.5(1,8)
|
26.5(1)
|
|
HA175
|
10
|
10,000
|
100.0(8)
|
53.0(8)
|
53.0(1)
|
|
HP287
|
9
|
5,600
|
50.4
|
46.4(4)
|
23.6(2)
|
|
HP288
|
9
|
7,900
|
71.1
|
65.4(4)
|
34.1(2)
|
|
HP349
|
7
|
13,000
|
91.0
|
88.7(4)
|
50.8(2)
|
|
HP350
|
7
|
16,000
|
112.0
|
107.8(4)
|
62.5(5)
|
- Governed by AISC allowable capacity of single Ø3/4" (HA150) or (2) Ø3/4" (HA175) Grade 8 bolt(s) in double shear.
- Governed by bearing at the bolt holes.
- Capacities include a scheduled loss in steel thickness due to corrosion for black, uncoated steel. Scheduled thickness losses are for a period of 50 years and are in accordance with ICC-ES AC358.
- Allowable compression capacities are 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.
- Listed mechanical capacities are for the shaft only. System capacities should also not exceed the installed torquecorrelated capacity or those listed in the respective bracket capacity tables.
- Listed default Kt factors are widely accepted industry standards. They are generally conservative and are consistent with those listed in ICC-ES AC358. Site-specific K t factors can be determined for a given project with full-scale load testing.
- Soil capacities listed are ultimate values at maximum installation torque. Allowable soil capacity values are obtained by dividing the ultimate values by the appropriate factor of safety (FOS). FOS is most commonly taken as 2.0, although a higher or lower FOS may be considered at the discretion of the helical pile designer or as dictated by local code requirements.
- Square shaft piles may be considered for compression applications in soil profiles that offer sufficient continuous lateral support; e.g., in soils with SPT blow counts ≥ 10. Even in these higher strength soil conditions, buckling analyses should be considered, taking into account discontinuities and potential eccentricities created by the couplers
