I-10 138kV Underground Transmission

Location: Houston, TX
Project Type: Expansion
CenterPoint Energy Houston Electric, LLC
Erich Schoennagel, P.E. 713 207-6496
Binkley & Barfield
Larry Barfield 713 869-3433

Project Scope

Scope included 5.5 miles of dual duct bank each containing nine 8 Inch Schedule 40 conduits (total conduit footage over 500,000 feet). The 11 miles of underground duct bank encloses a 138 kV transmission line with a large portion under the Interstate 10 West bound frontage road. The project presented many challenges due to the proximity to existing utilities, businesses, streets and the always-congested Interstate 10 corridor. Project requirements included placement of 25,000 yards of special thermally conductive red concrete encasement and 20,000 yards of flowable thermal back-fill under paved areas. There were 46 manholes sized 24 foot by 11 foot by 8 foot tall varying in burial depth from 16 to 30 feet. Several creek and road crossings required tunneling and directional drilling the longest was 1200 feet long.

Project Details

Original Construction Cost
Final Construction Cost
Date of Notice to Proceed
Type of Construction
Original Substantial Completion
Actual Substantial Completion
Final Payment Dates
Project Managers
Paul Greenwell
Project Superintendent
Dan Cassel & Shawn Adams
Project Engineer
Binkley & Barfield/Larry Barfield 713 869-3433
MEP Subcontractor
Boyer Self Performed
Length of Relationship with Owner
13 years