PROJECT OVERVIEW.

With the completion of the main trunk of sewers running along First Ponds Creek a few years ago, the next stage of the project was to construction major lead-ins off the trunk sewer to enable the construction of future reticulation sewers. Comdain was awarded the civil contract and then awarded the microtunnelling works to Pezzimenti Tunnelbore.

Riverstone Microtunneling Method

Riverstone Microtunneling Length Diameter Ground Pipe

Project Specifications

The Northwest Growth Centre is a combination of woodland, vegetable gardens and residential acreage. All this is changing as these areas are being developed for prime residential use to help meet Sydney’s chronis housing shortage.

Protecting Aboriginal Heritage.

Microtunnelling was the preferred method of construction as there are areas of significant Aboriginal Heritage. The longest microtunnel of 192m took a total of 20 days

 

Riverstone Microtunnelling Craning Steel Pipes

Steel Casing being craned into position ready to lower into the shaft.

Riverstone Microtunnelling Emptying Vacuum Truck

On-site Spoil Disposal. Emptying the spoil from V3 into a simple bunded area

Riverstone-Microtunnelling

The steel casing is considered to be part of the temporary works for the microtunnelling process. It’s prime function is to provide continuous ground support during microtunnelling. 

Riverstone Microtunnelling Site Layout

View along the alignment of the microtunnel from the exit shaft end.

Riverstone Microtunnelling Site Layout

View along the route of one microtunnel. The farm dam was adjacent to the microtunnel alignment

MICROTUNNEL 1.

SWGC Microtunneling Free Pipe Method
Free Pipe by Freebore Method

Length. 68m
Diameter.  430
Ground.  Saturated Clay / Sand /Gravel
Casing Pipe.  406 Steel
Carrier Pipe.  225 PVC

MICROTUNNEL 2.

SWGC Microtunneling Free Pipe Method
Free Pipe by Freebore Method

Length. 124m
Diameter.  630
Ground.  Saturated Clayey Sand / Gravel
Casing Pipe. 610 Steel
Carrier Pipe.  450 PP

MICROTUNNEL 3.

SWGC Microtunneling Pipe in a Pipe
Pipe in a Pipe by Pipejack Method

Length. 192m
Diameter.  630
Ground.  Saturated Clayey Sand / Gravel
Casing Pipe. 610 Steel
Carrier Pipe.  450 PP

MICROTUNNEL 4.

SWGC Microtunneling Pipe in a Pipe
Pipe in a Pipe by Pipejack Method

Length. 101m
Diameter.  530
Ground.  Saturated Clayey Sand / Gravel
Casing Pipe. 508 Steel
Carrier Pipe.  300 PP

Microtunnelling Riverstone Case Study