Sliplining is typically used in locations where digging long trenches may be difficult. It involves digging a sending and receiving pit to accommodate specialized equipment crews use to push or pull a new pipe into an existing, deteriorating pipe.
The work involves the following steps:
- Dig short trenches to expose existing sewer service lateral connections where adjacent properties are connected to the mainline public sewer.
- Disconnect existing sewer service laterals from the mainline public sewer pipe to be repaired and provide a temporary connection to maintain sewer service.
- Cover the sewer service lateral trenches with steel plates and proceed with the sliplining process.
- Remove roots from the pipe and flush debris from the pipe.
- Dig a sending and a receiving pit to the required length and depth.
- Lower sliplining equipment into the sending and receiving pit.
- Set up a sewer bypass system, if necessary, to re-route wastewater to other nearby pipes during the sliplining process.
- Use equipment to pull or push one or more segments of new sewer pipe into the existing sewer pipe being repaired.
- Open and reconnect sewer service lateral connections that were covered by the sliplining process.
- 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.
- Fill in any spaces with grout.
- Remove the bypass system, if used.
- 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 inspection.