March Towers

Project Scope and Purpose

This project was to design and construct four 60 foot high bridged antenna towers including foundations and site work. 

Specific Work Details

We drilled for concrete piers (36 in diameter and 26 feet deep) which required liquid drilling mud to prevent caving of subsurface soils.  Then we constructed concrete foundations for the towers (rebar, anchor bolts, and concrete caps with structural backfill).  The foundation system included large pier caps to help withstand seismic and wind loading on the structures.  We assembled and erected four 60' structural steel towers, each with 2 complete stairway systems from ground level to the top, including all galvanized steel: guardrails, stringers, treads, and grate landings.  We assembled and erected platform assemblies between tower pairs and one electrical equipment canopy.

Electrical work for this project included all associated infrastructure for lighting, power, and communications infrastructure.  This included but was not limited to:  tie into new existing encased electrical conduit and route to new transformer location; install new 4" electrical conduit and 2" communication conduit; install all infrastructure related to PGE transformer; install transfer switch, UPS, and generator with a strut based back board to support and underground conduits; pull rope for new communication system; install boxes, light switch, photo eye, wire, and lights.

We designed and constructed the lighting system for this project with a combination of airfield obstruction lights, stair landing lights, and lights at the antennae.   Each light served specific purposes, and therefore had specific control components.  The stair landing and antennae lights were controlled via a switch at the junction box, and the antennae lights were night sky compliant, while for the airfield obstruction lights we installed photocell controls.