Long Distance Microtunnelling Capability
In all the works required the installation by microtunnelling of 782 lin metres Ø225, 300 and 375 PVC encased by steel casing pipe. The drive lengths were 170m, 120m, 185m 132m & 175m.
Pezzimenti Tunnelbore were awarded the works by Zinfra P/L. The works were designed by Qalchek.
Project Details
The ground conditions were shale and clay. On two of the runs high plasticity clay was encountered which slowed progress considerably.
In all progress achieved was 20-30m per day for the drilling. Freeboring was carried out wherever possible to hasten the process and to change the cutters as required in the highly variable ground conditions.
Typical shaft setup in close proximity to the operating golf course.
Freeboring in Clayey Shale
300 Diameter RRJ PVC Pipes strapped with timber
Breakthrough of the microtunnelling head into the exit shaft.
MICROTUNNEL 1.
Free Pipe by Freebore Method
Length. 170m
Diameter. X
Ground. Shale & Clay
Casing Pipe. Steel
Carrier Pipe. PVC
MICROTUNNEL 2.
Free Pipe by Freebore Method
Length. 120m
Diameter. X
Ground. Shale & Clay
Casing Pipe. Steel
Carrier Pipe. PVC
MICROTUNNEL 3.
Pipe in a Pipe by Pipejack Method
Length. 185m
Diameter. X
Ground. Shale & Clay
Casing Pipe. Steel
Carrier Pipe. PVC
MICROTUNNEL 4.
Pipe in a Pipe by Pipejack Method
Length. 132m
Diameter. X
Ground. Shale & Clay
Casing Pipe. Steel
Carrier Pipe. PVC
MICROTUNNEL 5.
Pipe in a Pipe by Pipejack Method
Length. 175m
Diameter. X
Ground. Shale and Clay
Casing Pipe. Steel
Carrier Pipe. PVC
