Sensational-Adelaide.com

Goodsy wrote: ↑

Mon Aug 12, 2024 5:01 pm

SBD wrote: ↑

Mon Aug 12, 2024 4:48 pm

I think I heard this morning that the TBM(s) get built in a big hole, so there's a lot of digging needed before assembly can begin.

I imagine that one of them will proceed north from the north portal of the southern tunnel to the south portal of the north tunnel - this could even be how part of the trench is excavated!

Leaving them underground to rust and decay does not seem like a practical solution, just in terms of where that could be since there will be a road portal right in front, and rust would eventually lead to subsidence if they drove under the end of the surface roads.

If possible, reusing some of the TBM for a future Mount Barker/Murray Bridge link would be attractive, if only the cutting head needs to be changed from western suburb silt to Adelaide Hills rock. A tunnel under Cross Road is not an attractive solution as it extends the long decline we already have problems with. A KPMG report a few years ago had a "short south" option that built a freeway from south of Mount Barker to meet the NSM in the Darlington area by a mix of bridges and tunnels. This would avoid the long steep grade, and provide an alternate route from Mount Barker and Murray Bridge to city and suburban destinations for both commuters and road freight.

They don't "bury" them, they drive them into the ground in a burial chamber and concrete them in. The British did it after the Channel Tunnel with their TBM's. Interestingly enough the French recovered theirs

Goodsy wrote: ↑

Mon Aug 12, 2024 5:01 pm

SBD wrote: ↑

Mon Aug 12, 2024 4:48 pm

I think I heard this morning that the TBM(s) get built in a big hole, so there's a lot of digging needed before assembly can begin.

I imagine that one of them will proceed north from the north portal of the southern tunnel to the south portal of the north tunnel - this could even be how part of the trench is excavated!

Leaving them underground to rust and decay does not seem like a practical solution, just in terms of where that could be since there will be a road portal right in front, and rust would eventually lead to subsidence if they drove under the end of the surface roads.

If possible, reusing some of the TBM for a future Mount Barker/Murray Bridge link would be attractive, if only the cutting head needs to be changed from western suburb silt to Adelaide Hills rock. A tunnel under Cross Road is not an attractive solution as it extends the long decline we already have problems with. A KPMG report a few years ago had a "short south" option that built a freeway from south of Mount Barker to meet the NSM in the Darlington area by a mix of bridges and tunnels. This would avoid the long steep grade, and provide an alternate route from Mount Barker and Murray Bridge to city and suburban destinations for both commuters and road freight.

They don't "bury" them, they drive them into the ground in a burial chamber and concrete them in. The British did it after the Channel Tunnel with their TBM's. Interestingly enough the French recovered theirs

SBD wrote: ↑

Mon Aug 12, 2024 4:48 pm

I think I heard this morning that the TBM(s) get built in a big hole, so there's a lot of digging needed before assembly can begin.

I imagine that one of them will proceed north from the north portal of the southern tunnel to the south portal of the north tunnel - this could even be how part of the trench is excavated!

Leaving them underground to rust and decay does not seem like a practical solution, just in terms of where that could be since there will be a road portal right in front, and rust would eventually lead to subsidence if they drove under the end of the surface roads.

If possible, reusing some of the TBM for a future Mount Barker/Murray Bridge link would be attractive, if only the cutting head needs to be changed from western suburb silt to Adelaide Hills rock. A tunnel under Cross Road is not an attractive solution as it extends the long decline we already have problems with. A KPMG report a few years ago had a "short south" option that built a freeway from south of Mount Barker to meet the NSM in the Darlington area by a mix of bridges and tunnels. This would avoid the long steep grade, and provide an alternate route from Mount Barker and Murray Bridge to city and suburban destinations for both commuters and road freight.

Hooligan wrote: ↑

Tue Aug 13, 2024 7:02 am

SBD wrote: ↑

Mon Aug 12, 2024 4:48 pm

I think I heard this morning that the TBM(s) get built in a big hole, so there's a lot of digging needed before assembly can begin.

I imagine that one of them will proceed north from the north portal of the southern tunnel to the south portal of the north tunnel - this could even be how part of the trench is excavated!

Leaving them underground to rust and decay does not seem like a practical solution, just in terms of where that could be since there will be a road portal right in front, and rust would eventually lead to subsidence if they drove under the end of the surface roads.

If possible, reusing some of the TBM for a future Mount Barker/Murray Bridge link would be attractive, if only the cutting head needs to be changed from western suburb silt to Adelaide Hills rock. A tunnel under Cross Road is not an attractive solution as it extends the long decline we already have problems with. A KPMG report a few years ago had a "short south" option that built a freeway from south of Mount Barker to meet the NSM in the Darlington area by a mix of bridges and tunnels. This would avoid the long steep grade, and provide an alternate route from Mount Barker and Murray Bridge to city and suburban destinations for both commuters and road freight.

The short south option looked good, and would cost less than a cross road tunnel.

I personally like the short north option they also mentioned, extending Grand Junction road with a tunnel through the hills and having an at grade freeway connecting to the South Eastern Freeway just east of Mount Barker. I like this one because it also gives freight and alternative north-south option.

SBD wrote: ↑

Tue Aug 13, 2024 1:52 pm

Hooligan wrote: ↑

Tue Aug 13, 2024 7:02 am

SBD wrote: ↑

Mon Aug 12, 2024 4:48 pm

I think I heard this morning that the TBM(s) get built in a big hole, so there's a lot of digging needed before assembly can begin.

I imagine that one of them will proceed north from the north portal of the southern tunnel to the south portal of the north tunnel - this could even be how part of the trench is excavated!

Leaving them underground to rust and decay does not seem like a practical solution, just in terms of where that could be since there will be a road portal right in front, and rust would eventually lead to subsidence if they drove under the end of the surface roads.

If possible, reusing some of the TBM for a future Mount Barker/Murray Bridge link would be attractive, if only the cutting head needs to be changed from western suburb silt to Adelaide Hills rock. A tunnel under Cross Road is not an attractive solution as it extends the long decline we already have problems with. A KPMG report a few years ago had a "short south" option that built a freeway from south of Mount Barker to meet the NSM in the Darlington area by a mix of bridges and tunnels. This would avoid the long steep grade, and provide an alternate route from Mount Barker and Murray Bridge to city and suburban destinations for both commuters and road freight.

The short south option looked good, and would cost less than a cross road tunnel.

I personally like the short north option they also mentioned, extending Grand Junction road with a tunnel through the hills and having an at grade freeway connecting to the South Eastern Freeway just east of Mount Barker. I like this one because it also gives freight and alternative north-south option.

Short North would likely then eventually require a freeway supplement/replacement for Grand Junction Road to provide a better freight route down to the Port River Expressway. It's kind of surprising we don't hear about more runaway trucks coming down from Hampstead Road and failing to stop at Main North Road now. If they're all built, we'd end up with a freeway ring route anyway!

SBD wrote: ↑

Tue Aug 13, 2024 1:52 pm

Hooligan wrote: ↑

Tue Aug 13, 2024 7:02 am

SBD wrote: ↑

Mon Aug 12, 2024 4:48 pm

I think I heard this morning that the TBM(s) get built in a big hole, so there's a lot of digging needed before assembly can begin.

I imagine that one of them will proceed north from the north portal of the southern tunnel to the south portal of the north tunnel - this could even be how part of the trench is excavated!

Leaving them underground to rust and decay does not seem like a practical solution, just in terms of where that could be since there will be a road portal right in front, and rust would eventually lead to subsidence if they drove under the end of the surface roads.

If possible, reusing some of the TBM for a future Mount Barker/Murray Bridge link would be attractive, if only the cutting head needs to be changed from western suburb silt to Adelaide Hills rock. A tunnel under Cross Road is not an attractive solution as it extends the long decline we already have problems with. A KPMG report a few years ago had a "short south" option that built a freeway from south of Mount Barker to meet the NSM in the Darlington area by a mix of bridges and tunnels. This would avoid the long steep grade, and provide an alternate route from Mount Barker and Murray Bridge to city and suburban destinations for both commuters and road freight.

The short south option looked good, and would cost less than a cross road tunnel.

I personally like the short north option they also mentioned, extending Grand Junction road with a tunnel through the hills and having an at grade freeway connecting to the South Eastern Freeway just east of Mount Barker. I like this one because it also gives freight and alternative north-south option.

Short North would likely then eventually require a freeway supplement/replacement for Grand Junction Road to provide a better freight route down to the Port River Expressway. It's kind of surprising we don't hear about more runaway trucks coming down from Hampstead Road and failing to stop at Main North Road now. If they're all built, we'd end up with a freeway ring route anyway!

Will wrote: ↑

Mon Jun 05, 2006 1:43 pm

From the Advertiser:


OVERPASSES COULD
SLASH $133m
FROM ROAD COSTS
By CAMERON ENGLAND and KARA PHILLIPS
05jun06
EXCLUSIVE
BUILDING overpasses rather than tunnels on South Rd could shave $133 million off the bill on the blowout-plagued projects, the state's peak resources body said yesterday.

abc wrote: ↑

Wed Aug 14, 2024 9:31 pm

30 years to upgrade a road

it'll be 100 years before Adelaide sees an underground rail line... meanwhile Perth...

Saltwater wrote: ↑

Thu Aug 15, 2024 9:09 am

30 years to upgrade a road really does make it a once in a generation event. Hopefully it's worth it when built. The current plans are looking very good.

As for Perth, good on them as they've been at the centre of a once in 100 year mineral boom, and it's great to see they've funnelled some of that back into some decent infrastructure including a sizeable freeway network, underground rail through the city and an airport link. Stuff we could only dream of.

rhino wrote: ↑

Thu Aug 15, 2024 9:31 am

[quote=Saltwater post_id=219450 time=<a href="tel:1723678794">1723678794</a> user_id=8131]
30 years to upgrade a road really does make it a once in a generation event. Hopefully it's worth it when built. The current plans are looking very good.

As for Perth, good on them as they've been at the centre of a once in 100 year mineral boom, and it's great to see they've funnelled some of that back into some decent infrastructure including a sizeable freeway network, underground rail through the city and an airport link. Stuff we could only dream of.