We understand the importance of engineering designs, reviews, and approvals. As there was no previously established or industry accepted design philosophy or equation to define shotcrete liners installed on existing culverts, we worked with a third-party engineering firm to build a program to ensure the future performance of all work done by National Gunite.
National Gunite’s Customized Pipelining Design Program takes user input on the type, size, and structural makeup of the conveyance system and the geotechnical constraints for the surrounding soil conditions then iterated on coating thickness and reinforcement per foot to provide the optimized and most economical structural design for the repair. The design equations assume zero strength of the existing structure and are based on concrete pipe design with a flexibility factor applied for applications onto corrugated metal piping.
With National Gunite’s quality craftmanship and custom designs engineered for your project, you can have the confidence that you are investing in a fully structural solution that is not overdesigned nor under designed.
- Microsilica Additives
- PSI Strength
- Water Flow
Fully Structural Rehabiliation using merely 2” of structural Gunite with 2” x 2” 12-gauge welded wire mesh reinforcement added.
Several days after the sewer was structurally rehabiliated, the Prime Contractor, using pneumatic chipping hammers, chipped off all the brick from the outside of the sewer leaving the fully structural Gunite in place (top picture). Internal bypass was achieved by running rigid PVC through the invert (botton right) when lining the crown and sides of the pipe. Bypass was then hung fom the side of the pipe (bottom left) while structurally lining the Invert.
National Gunite’s key to success are the trusted relationships we have built with our customers. Service doesn’t end when the project is completed.