Crews dig a sending pit and a receiving pit to install a new sewer pipe. They place a microtunnel boring machine in the sending pit and cut a hole underground horizontally from the sending pit to the receiving pit, without disturbing the surface above. As the machine drills the hole, a jacking rig functions like a jack hammer to push the new sewer pipe in place between the boring machine and the jacking rig.
The work involves the following steps:
- Dig a sending and a receiving pit to the required depth.
- Place a microtunnel boring machine into the sending pit.
- Use the machine to cut a hole through the ground and push the new sewer pipe in place.
- Remove the microtunnel boring machine and the jacking rig.
- Connect the new pipe to the existing public sewer.
- Cover open pits with steel plates—or secure the pits with fencing—at the end of each day as needed while work is in progress.
- Backfill pits with sand or gravel and apply temporary asphalt patches.
- Conduct quality control inspections.
- Complete permanent pavement restoration of patched pits after work passes inspections.