Utility Structure Foundations | Hubbell Power Systems
Our pole base grillages offer the support you need to maintain sturdy foundations during construction. Comprised of a welded steel plate and hollow structural steel, grillages facilitate
For most substation equipment support structures and line support structures, the foundations are required to resist moderate shear forces and overturning moments. For A-frame and lattice-type line support structures, shear, uplift, and compression are typical design loads.
Common sizes for substation foundations range from 24 inches to 60 inches in diameter, in 6-inch increments. Drilled shafts above 84 inches in diameter are typically installed in 12-inch increments with a maximum diameter of 120 inches available for extreme substation applications.
There are three types of foundations typically installed in a substation: helical piles installed with an excavator; driven piles installed with a large piling rig; and concrete cast-in-place type foundations where carpenters frame up forms and pour concrete to create the foundation.
The designer must consider what level the top of the foundation should be installed at when laying out the substation, such as foundation below, at, or above finished ground level, with the equipment support either directly on top of the foundation, a small distance above the foundation, or say 100 or 200 mm above the foundation.
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