Transmission And Substation Foundations - Technical Design Manual (TD06088E)

Recommendation: 1. Center Piles

a. Install 2-RS8625.188 i. Minimum spacing is 48” (6*largest helix dia) ii. Installation Torque=25,000 ft-lbs

iii. Estimated embedment=40 ft iv. Minimum embedment=15 ft

2. Guy Anchors

a. Install SS150 Helical Anchors i. Minimum effective installation torque: 6,000 ft-lbs ii. Estimated Embedement=55 ft iii. Batter piles within ±5° of guy wires

2. Assumptions

i. Boring is representative of the location 1. Water table deeper than 40 ft ii. Loads given are working loads 1. Center Base a. Compression: 100 kip b. Shear: 1 kip 2. Guyes a. 30 kip iii. Piles are installed at ground level iv. Torque to Capacity Ratio:

DESIGN EXAMPLES

1. RS8625 is 4:1 2. SS150 is 10:1

v. RS8625 piles have pinned head condition vi. Require an axial factor of safety of 2.0 vii. ½” of lateral deflection acceptable at working loads

3. Notes a. May reach installation torque before reaching minimum embedment. Adhere to minimum embedment i. Ensure final torque is greater than required installation torque at given depth

b. Maximum torque for RS8625.188 is 50,000 ft-lbs. Do not overtorque c. Maximum torque for SS150 is 7,000 ft-lbs. Do not overtorque

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