Close Fit Pipe – Temporary Outer Casings
The methodology below shows how pezzimenti utilises a retractable head for the Close-Fit Bore
Section with a temporary outer casing, e.g. for:
• GRP Jacking Pipe for sewer
• Concrete Jacking Pipe for stormwater
+ Close-Fit Pipe Bore Section
01. Microtunnel
The retractable microtunnelling head is launched from the entry shaft inside the first outer casing.
02. An Obstruction Encountered
In the event that an an obstruction is encountered, ground conditions change or the head requires repair – the microtunnelling head can be retracted – while the outer casings remain in place to support the ground.
03. Situation Remedied
Once the Obstruction has been removed; the Cutters replaced to match ground condition; or the microtunnelling head has been repaired, the microtunnelling head is pushed back to the face and microtunnelling recommenced.
04. Bore Completed
The microtunnelling head can be removed via the exit Shaft OR retracted back to the launch shaft.
05. Permanent Outer Casings
Carrier Pipes are jacked in to replace the temporary outer casing, e.g. Temporary steel casings are replaced by concrete jacking pipes under a railway.
Book a Presentation
For futher information on Retractable Microtunelling Head Capabilities and Methodologies book a presentation for your design team with Pezzimenti today. Call Scott Wells on: +61 (2) 4735 6676 or email scott.wells@pezzimenti.com.au
