Pipejacking a reinforced concrete jacking pipe.
Pipejacking Steel Casings
Pipejacking GRP Jacking Pipes
Pipejacking Microtunneling Methods
There are 3 primary outcomes for all microtunneling and pipe installations. These are the
- Free Pipe – Carrier Pipe is grouted into a microtunneling where the ground is self supporting.
- Close Fit Pipe– Carrier Pipe is also the Casing Pipe. Use for projects where the gap between Pipe OD and Microtunnel ID is less than 25mm, and;
- Pipe-in-a-Pipe – A carrier Pipe sits within an Outer Casing Pipe.
The Pipejacking Microtunneling method can achieve the Close Fit Pipe and Pipe in a Pipe outcomes as outlined below.
Close Fit Pipe – Pipejacking Method
Step 1. The ground has been determined as not self-supporting. Jacking pipes are jacked behind the microtunnelling head. For Sewer lines, GRP jacking pipes act as the carrier pipes. For Stormwater lines, GRP and / or concrete pipes act as the carrier pipe.
Pipe in a Pipe – Pipejacking Method
Step 1. The ground has been determined as not self-supporting, requiring additional ground support during microtunneling. The selected Casing Pipes are jacked behind the microtunnelling head. Step 2. The Carrier Pipe is inserted into the Casing Pipe and the annular space grouted.