Modelling helical screw piles in soft clay and design

Foundation Helical Piers/Screw piles/Helical anchor

Shaft Size

Installation Torque Factor (k)

Axial Compression Load Limit

Ultimate-Limit Tension Strength

Useable Torsional Strength

Practical Load Limit Based Torsional Strength

1-1/2” Square Bar

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

1-3/4” Square Bar

9 - 11

100,000 lb.

100,000 lb.

11,000 ft-lb

2-1/4” Square Bar

10 - 12

200,000 lb.

200,000 lb.

23,000 ft-lb

2-7/8” Tubular – 0.203” Wall

8 - 9

60,000 lb.

60,000 lb.

5,500 ft-lb

44,000 lb

2-7/8” Tubular – 0.262” Wall

8 - 9

100,000 lb.

100,000 lb.

9,500 ft-lb

80,000 lb

3-1/2” Tubular – 0.300” Wall

7 - 8

115,000 lb.

120,000 lb.

13,000 ft-lb

97,000 lb

4-1/2” Tubular – 0.337” Wall

6 - 7

160,000 lb.

160,000 lb.

22,000 ft-lb

143,000 lb

Helix Blade

8", 10", 12" and 14" in diameter with 3/8", 1/2" thickness.

Finish

Plain, Hot Dipped Galvanized, Painted, Powder Coating are available on your request.

A time-proven, versatile, and technically sound system

Lower cost and faster installation than other methods

Installs quickly with small or handheld equipment.

Can be installed in limited-access areas or tight access.

Site cleand minimize damage to landscape.

Soil load bearing capacity is tested during installation.

Helical anchors available with single, double and triple helix blades.

Available with optional hot-dip galvanization for added corrosion protection.