But ultimately, we were able to do what we needed to do with our standard pumps,” Synder says.ĭewatering was even trickier. “The staging area on the embankment meant that we had to pump down, then up plus, of course, we were pumping through nearly 500 ft of hose, all of which added significant pumping load. The “complications” Snyder referred to on this particular culvert, included a staging area that was on an embankment 25 ft above the pipe invert and high groundwater entering the culvert via numerous perforations in the seriously corroded CMP, especially in the upstream half of the culvert. “But, on the other hand, we learned a lot about what can be done with CCCP, and I’m looking forward to projects that are even bigger and more challenging.” CMP, with complications, was a big project for us, approaching the maximum that we’re able to undertake successfully with our current setup,” Snyder says. “And the material used (PL-8,000, a cementitious mortar from AP/M Permaform) is on our approved list, so this should work well for us.”Īs of July 2015, AWC has completed work on four of the seven highway culverts, including the obvious standout in the above list: “ 460 ft of 48-in. “We want as little hydraulic constriction as possible,” said a CDOT hydraulic engineer. The thickness, or rather thinness, of CCCP culvert renewal was valuable to CDOT. Lengths, diameters and composition of the seven CCCP-rehabilitated culverts are as follows: And the process is cost-effective, especially when compared to cured-in-place pipe (CIPP) in large diameter pipe. CentriPipe also requires smaller staging areas than most competing solutions. The process creates a new pipe within the old sewer or culvert, a pipe that is structurally sound (independent of the original substrate), waterproof and long lasting. “And since specifications were written in a way that permitted CCCP, we went for it - it’s the largest CentriPipe project in Colorado, so far.”ĬentriPipe is a technology developed by AP/M Permaform, based on a spincasting sled that is inserted into pipe and withdrawn, while an operator on the sled monitors the withdrawal rate to spray thin, even, layers of high-strength cementitious mortar that adheres to most substrates, including CMP, brick and clay. “There were a total of 10 large culverts in this particular project (CDOT #20158R, Region One, covering the Greater Denver Metro and Central Colorado area) and seven seemed like good candidates for CCCP,” says Paul Snyder, president of American West Construction LLC (AWC). Centrifugally cast concrete pipe (CCCP) is an established trenchless rehabilitation solution for large diameter sewers and culverts and is gaining ground with state departments of transportation (DOTs), which are traditionally conservative when adopting new technology.Ī recent culvert rehabilitation project, let by the Colorado Department of Transportation (CDOT) is groundbreaking in this regard.