A retrofit of the foundation of a 200 foot self-support communications tower. We worked with the designing engineering firm Global Production Solutions, Inc., B-Line Construction was a subcontractor of Westower Communications. The on-site inspectors were Neil Anderson & Associates.
The project required careful attention to the existing utilities and the existing structures on the site while excavating and installing the helical piers. Before anything could be done, including the ordering of any materials, a load test was performed to verify that the helical piers would provide the required load capacity taking into account the soil conditions. The helical piles were protected from corrosion using an anchor guard cathodic protection system with monitoring. Due to the location of the tower, vineyard equipment and materials had to be moved before excavation could proceed.
Dowels were installed under the field inspection of Neil Anderson & Associates. The epoxy used in this project was HILTI HIT-RE 500 SD Epoxy. The existing caisson foundation was prepared for installation of rebar. Prior to the dowel installation, the caissons were X-Rayed so that existing reinforcing steel and anchor bolts were not damaged. Helical piers and pile caps were installed to the required foot pounds of torque, providing the ultimate bearing capacity as specified by the engineer in the provided plans. A SIKADUR 32 HI-MOD Gel was used to bond the existing concrete to the new. New construction pile caps were installed by bolting them to the top of the helical pier, the caps were then grounded with copper wire, and the concrete was then poured. Upon completion, the site was restored to its original condition.