ECP Utility
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Helical Anchors 4-1/2” Round Shaft

ECP Utility is a leading producer of round shaft helical anchors for the electric, solar and wind power industry. The 4-1/2” tubular shaft anchor is employed on the toughest high voltage electric transmission tower foundations. From H Frame Towers to Monopoles and Lattice Towers, ECP Utility offers 4-1/2” round helical anchors as a stable foundation solution for transmission grids.

4-1/2” ECP Utility Helical Anchors has many applications including:

  • 143,000# Capacity
  • Tower Foundations
  • Substation Platforms
  • Solar Panel Foundations
  • Equipment Platforms
  • Wind Turbines
  • Lattice Towers
  Helical Anchors

ECP Utility offers 4-1/2” round shaft helical anchors and their matching extensions provide a solid foundation for your tower, pole or substation needs. Their ease of installation and ability to be immediately loaded and installed in remote locations make the ECP Utility 4-1/2” helical anchor the heavy duty helical anchor for tower construction.

Why 4-1/2” helical anchors are the best solution:

    • Ease of Installation
    • Little to No Vibration
    • Immediate Load Transfer upon Installation
    • Installed Torque Correlates to Capacity
    • Easily Load Tested to Verify Capacity
    • Installs Below Active Soils
    • All Weather Installation
    • Little to No Disturbance to Jobsite

The electric transmission tower industry has relied on round shaft helical anchors for tower support for numerous years. The largest consumers of helical anchors, the electric power transmission and distribution industries, has embraced heavy duty 4-1/2” helical anchors for their lateral strength and reliable performance.

4 1/2" round
Standard ECP Torque Anchor™ Lead Configurations
Product Designation
Plate Diameter-inches
Plate Area sq. ft.
Length
“A”
“B”
“C”
TAF-450-84 (10-12-14)
10
12
14
2.07
84”
HTAF-450-120 (10-12-14)
10*
12*
14*
2.07
120”
Standard ECP Torque Anchor™ Extensions
Part Number
36”
60”
84”
120”
TAE-450-36
TAE-450-60
TAE-450-84
TAE-450-120
Note: Products Listed Above Are Standard Items And Are Usually Available From Stock.
Other Specialized Configurations Are Available As Special Order – Allow Extra Time For Processing.
All Helical Plates Are Spaced At Three Times The Diameter Of The Preceding Plate
Extensions are Supplied with an Internal Coupling and Hardware.
All Product Hot Dip Galvanized Per ASTM A123 Grade 100.
Shaft Weight per Foot – TAF-350 - 10.2 lb; TAF-450 – 15.4 lb
* “H” before part designation indicates helical plate thickness of 1/2 inch instead of standard 3/8”
Table 2.                                 Capacities of ECP Helical Torque Anchors™
Shaft Size
Installation Torque Factor (k)
Axial Compression Load Limit
Ultimate-Limit Tension Strength
Useable Torsional Strength
Practical Load Limit Based Torsional Strength
9 - 11
70,000 lb.
70,000 lb.
7,500 ft-lb
Load limited to the rated capacity of the attachments and the lateral soil strength against the shaft
9 - 11
100,000 lb.
100,000 lb.
10,000 ft-lb
10 - 12
200,000 lb.
200,000 lb.
23,000 ft-lb
8 - 9
100,000 lb.
100,000 lb.
9,500 ft-lb
80,000 lb
7 - 8
115,000 lb.
120,000 lb.
13,000 ft-lb
97,000 lb
6 - 7
160,000 lb.
160,000 lb.
22,000 ft-lb
143,000 lb
The designer should select a product that provides adequate additional torsional
capacity for the specific project and soil conditions.

IMPORTANT NOTES: 
The capacities listed for Axial Compression, Tension and Torsion in Table 2 are mechanical ratings.  One must understand that the actual installed load capacities for the product are dependent upon the actual soil conditions on a specific job site.  The shaft “Useable Torsional Strengths” given here are the maximum values that should be applied to the product.  Furthermore, these torsional ratings assume homogeneous soil conditions and proper alignment of the drive motor to the shaft.  In homogeneous soils it might be possible to achieve up to 95% or more of the “Useable Torsional Strength” shown in Table 2.  In obstruction-laden soils, torsion spikes experienced by the shaft may cause impact fractures of the couplings or other components.  Where impact loading is expected, reduce shaft torsion by 30% or more from “Useable Torsional Strength” depending upon site soil conditions to reduce chance of fracture or damage.  Another advantage of selecting a torsional rating below the values shown in Table 2 is that one may be able to drive the pile slightly deeper after the torsional requirements have been met, thus eliminating the need to cut the pile shaft in the field.
The load transfer attachment capacity must be verified for the design.  Standard attachments and ratings are shown on the following pages.  Special configurations to fit your project can be fabricated to your specifications upon request.
4-1/2" 115,000# Compression Helical Piles
Part #
Size
Length
# Helix
Helix Diameter
Leads
TAF-450-60 (12)
3-1/2"
60"
1
12"
TAF-450-60 (8,10)
3-1/2"
60"
2
8",10"
TAF-450-60 (10,12)
3-1/2"
60"
2
10",12"
TAF-450-84 (10,12)
3-1/2"
84"
2
10",12"
TAF-450-84 (12,14)
3-1/2"
84"
2
12",14"
TAF-450-84 (8,10,12)
3-1/2"
84"
3
8",10",12"
TAF-450-84 (10,12,14)
3-1/2"
84"
3
10",12",14"
Round Helicals
4-1/2" Helical Extensions
Part #
Size
Length
# Helix
Helix Diameter
Extensions
TAE-450-36
4-1/2"
36"
0
NA
TAE-450-60
3-1/2"
60"
0
NA
TAE-450-84
3-1/2"
84"
0
NA
TAE-450-36 (14)
3-1/2"
36"
1
14"
TAE-450-60 (14)
3-1/2"
60"
1
14"
TAE-450-60 (12,14)
3-1/2"
60"
2
12",14"
Round Extensions
   
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