HDD Conductor Casing Grouting
The Job
This conductor casing grouting project took place in Panama City, Florida. It was part of a utility relocation associated with the Dupont Bridge replacement project. An HDD contractor installed two 48-inch diameter conductor casings. They then launched intercepting HDD shots from each casing to the middle of the river. The contractor successfully pulled a 24-inch PVC waterline into place.
Performing the HDD conductor casing grouting.
The Challenge
After pulling the pipe, the contractor needed to grout the conductor casings. This grouting had to displace the existing drilling fluid with a moderate strength grout. This process ensures long-term stability of the surrounding infrastructure at each launch site. The grout needed to uniformly displace the mud while minimizing placement pressures on the new pipe. The material also had to minimize the heat of hydration. Finally, the contractor needed to prevent losing material beyond the ends of the casings.
The Solution
CJGeo proposed using an 80-pound per cubic foot CJFill-Under Water cellular grout. We successfully placed this material to meet all project requirements. The cellular grout uniformly displaced the mud without putting excessive pressure on the new PVC pipe. It also minimized heat generation and prevented material loss outside the casings. Our crew completed the work in a single day. The displaced mud volumes perfectly matched the grout placement volumes.
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