66″ CMP w/ Separated Joints
The Town of Cary called us about a void that existed under some sidewalk in a neighborhood. They thought they would need to build a new pipe (spincast), and were interested in a price for spincasting. When we inspected the pipe, we found it to be in sound structural condition. The individual sticks of pipe simply weren't joined correctly at time of original install, and those joints had been allowing infiltration. For a couple thousand dollars, and in just one day, we filled the voids that had been created over the years, stabilized the soils around the pipe, and permanently sealed the separated joints. One day, when the metal does begin to oxidize and the CMP becomes compromised structurally, we will return and spincast the Town a new pipe. Since have now sealed the joints and filled the voids, we will be able to spincast the new pipe for even less money than normal.
Void under sidewalk created by the separated joints in the pipe below
Dangerous void under sidewalk created by separated joints in pipe.
Injecting hydroactive grout behind pipe to fill voids, stabilize soils, and permanently seal joints.
Injection grouting from inside the pipe.
As we were injecting beside this joint, we pushed all the water out of the void with the more dense hydroactive grout. Once the water was out of the void, the hydroactive grout itself began coming out of the joint. In this picture, we are about the contain that material, keep it in the void, and allow it to fill the entire void and seal the joint as it expands and builds strength.
Hydroactive grout is swelling, expanding, and building strength as it fills the entire void and seals the joint.
Permanently sealed separated joint
Permanently sealed joint.
Void has been filled with hydroactive grout, and we placed a layer of dirt atop the hydroactive grout to allow for grass to grow there.