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The importance of the precast segment is basically
to ensure that there's no exposed rock
for the tunnel itself
it ensures it's structurally sound
Wagners are producing concrete tunnel segments for the project
Roughly about five hundred... six hundred segments a day
In total 25,000 segments will be required for this project
Six segments per ring.
We will be producing these rings in a factory that's just behind me
and we're going to produce them during day shift during the initial phase
and we'll be moving to having day shift and night shift.
The segments are going to be loaded onto trucks
Forty rings that are going to be loaded per night
All the transfer of the segments are through night shift
and they're being transferred to the holding yard of the Gabba
Two rings that we have here that are put together
so we can check the dimensions of the mould
and the whole production process
with these dimensions, we can see if all the segments are going to fit perfectly
in the final products and all the moulds that are going to be making these segments
are going to have identical dimensions.
We're standing right beside the segment storage area at the Gabba
You can see all the segments getting stored behind us
So these are what will be lined behind the tunnel boring machines
as they progressively excavate the tunnels
once it arrives here, obviously you can see behind us there's a forklift
and it gets picked up off the back of a semi
it arrives as a full ring
so a ring has six segments
it's carried three stacks
two separate areas on the back of the truck
Forklift takes up three segments at a time
and it gets placed onto those plinths
and once it's on those plinths, you can see there
at the moment they do measurements checks and make sure it conforms with the quality
ensure there is no cracking or any defects during the transfer to site.
Around the perimeter of each of the segments
is a waterproofing membrane, or gasket
and that touches on each of the segments
and when the machine pushes off the segment, it compresses the gasket to ensure that it's water proof
Two of these particular segments are actually smaller
but it's the keystone to form the ring, the circumference of the segmental lining
once the segment has been installed, there's dowels on each of the transfers
and also speed bolts are attached to make sure the ring is locked in
it's an exciting role because you're coming in every day
seeing a new segment being produced, a new ring being produced
and the camaraderie between people working on the line
and the aim and target for everyone
is to have a complying segment that is going to perform well in its intended use
We all come together to make this happen.
We can proudly look back and tell the next generation that we've been a part of this project.
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