Tampa Thermal Grouting
The Job
Duke Energy is upgrading an underground transmission system in Tampa, Florida. As part of this extensive project, contractors mined a 184-linear-foot, 48-inch diameter microtunnel beneath an arterial roadway. This microtunnel serves as a conduit for high-voltage electrical cables. CJGeo performed the thermal grouting for the microtunnel’s annular space.
CJTherm TM-5 grout venting at the far end.
The Challenge
The high-voltage transmission lines generate significant heat during operation. To ensure the cables operate at optimal temperatures without sacrificing performance or longevity, this heat must be efficiently transferred away from the conduit. The project required a specialized grout with specific thermal resistivity properties to facilitate this heat dissipation.
The Solution
CJGeo’s crew filled the space around the pipe in a single operation using our TM-5 thermal grout. We checked the pressure while pumping the grout, which reached a peak of 22.79 psi. To ensure a complete fill, we watched for grout to come out of a vent at the far end of the tunnel. We finished the job in one day, causing minimal disruption. After completing the work, Geotherm of Houston, Texas, tested the grout to see how well it handled heat. The tests showed the grout had a wet cast rho of 52 and a 0% moisture rho of 90, meeting the project’s strict heat requirements.
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