Transmission And Substation Foundations - Technical Design Manual

SECTION 7: DESIGN EXAMPLES

Design Example 3

A.B. Chance SS176 PULLDOWN(R) Micropile Installation Torque vs. Required Pile Length

45

Torque and Pile Length Required to Achieve 85 kip Ultimate Load

40

Based on 6” Diameter Grout Column Providing .242 kip per Foot Friction Capacity

35

THORQUE VS. DEPTH

30

Pile Length (ft)

25

7677

7777

7877

7977

8077

8177

8277

I nIsntsatl al al ltai ot ino nToTroqruqeu e( f (t -f tl b- l)b )

Torque vs. Required Length Figure 7 -13

A pile layout for this design is included in Figure 7-14.

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