Contractors working on the Cherry Street sewer relocation are using a specialized technique to minimize vibrations caused while excavating a 25-to-28 feet-deep trench for a new 60-inch sewer line.
Evansville Water and Sewer Utility Deputy Director of Utilities, Mike Labitzke, said steel sheet pilings are being driven into the ground to stabilize the trench wall and keep it from caving in.
“The trench shoring system being used is called a slide rail system which minimizes the amount of pile driving to 10 percent of a typical deep-shoring application,” Labitzke said. “Slide rail trenching reduces the volume of vibration by up to 90 percent. Even at 10 percent, we realize there are some vibration issues with the construction. We are continuing to monitor it with seismic equipment to make sure we don’t exceed vibration limits.”