138kV Underground Transmission Duct Bank Installation, Garrott to Polk Substation
BBI provided engineering services for the installation of 13,000 linear feet of a 138 kV Transmission system for CenterPoint Energy Houston Electric Transmission from Garrott substation to Midtown substation ultimately ending at the Polk substation. The project required the creation of designs and the use of construction methods including trenchless technologies to minimize impact on automobile and pedestrian traffic in this congested urban areas. This stipulation required the use of Micro-tunneling, Box Tunneling, Open Trench, and Horizontal Directional Drill (HDD) construction methods. Binkley & Barfield used specialized planning and equipment to accommodate two HDD drills in very restrictive, narrow, and congested areas of the project. One of the equipment used to successfully complete the project within the constraints of space and time was a 300,000-pound-pullback drill rig manufactured by Laney, used on both street crossings. This HDD unit was powered by a 500-horsepower engine to allow for the significant field power necessary to complete the project.
BBI was responsible for full engineering services including Horizontal Directional Drill (HDD), Surveying, Construction Staking, Plan and Profile design for ductbanks, Manholes, Traffic Control Design, and approvals/permitting from multiple agencies including TxDOT, City of Houston, METRO, Houston Community College, and The Midtown District.