A cell phone tower company has a tower site at the top of a steep hill in a remote location in Eastern Tennessee. As the hill has grades as steep as 2 on 1, and averaging 3 on 1, a roughened concrete road was installed for traction to perform periodic tower maintenance. A concrete-lined ditch had been installed on one side of the access road. While the cross slope on the access road directed most of the water into this concrete ditch, some water still ran along the opposite side of the road from the nearby shoulder.
This water created a drop-off along the access road that was threatening the integrity of the road itself. Water had begun to undermine the access road’s concrete surface and the drop-off itself was becoming a hazard. This erosion had to be taken care of and future stormwater controlled before it compromised the access road entirely.
The engineer and cell phone tower company were both trying to find better materials and methods to solve their erosion control problems, so they selected Concrete Cloth GCCM.
On the first day, the contractor was unable to relocate the swale away from the access road because of the difficult terrain. Instead, he excavated a swale directly along the side of the roughened concrete access road. Due to the steep terrain and the soil filled cobblestone, the swale surface was rough. Concrete Cloth GCCM was able to conform to uneven grading contours.
The contractor poured concrete for a cross culvert replacement and a couple of spots on the roughened access road where the concrete had previously been undermined.
On the second day (8-10 hours spread over two days), the contractor built a rig for the front of a skid steer loader that allowed him to roll out a complete bulk roll of Concrete Cloth GCCM on the access road alongside where the new swale was to be located. Then the contractor’s superintendent and his one onsite laborer easily dragged the Concrete Cloth GCCM laterally into the correct position in the swale. The far side of the Concrete Cloth GCCM was buried and grouted on the edge along the access road to prevent water from getting under the material.
On the third and final day, the contractor continued grouting the edge of the concrete access road where it met the Concrete Cloth GCCM.
Concrete Cloth GCCM was successfully installed and continues to provide erosion protection. The contractor and the engineer have another project where Concrete Cloth GCCM is planned for use.
Application: Culvert Invert Lining
Client: Elba Township, Knox County, IL
Location: North of Yates City, Illinois
Installation: August 2014