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Old March 12th, 2015, 10:05 PM   #2821
ChrisZwolle
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http://www.dot.state.fl.us/planning/...rridors/TB-NE/

A new toll road is being studied to link Tampa and Jacksonville.

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Old March 12th, 2015, 11:00 PM   #2822
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US 89, Arizona

The US 89 section that was destroyed in a landslide two years ago is being completed. They started paving the restored highway. It will open later this month.


US 89 Landslide Repair (March 2015) by Arizona Department of Transportation, on Flickr


US 89 Landslide Repair (March 2015) by Arizona Department of Transportation, on Flickr
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Old March 16th, 2015, 10:57 PM   #2823
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Golden Gate Bridge
by rovertrain, on Flickr
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Old March 17th, 2015, 04:39 AM   #2824
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Quote:
Originally Posted by ChrisZwolle View Post
Bertha (the name of the tunnel boring machine):


Bertha's parking spot by WSDOT, on Flickr
Mazel tov - they finally can start fixing thins thing
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Old March 17th, 2015, 04:54 AM   #2825
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120 feet, so around 36 meters. It's quite the repair job. Imagine if this had happened under the sea.
the bill for this repair is about 120 million $. I wonder who will pay the bill?
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Old March 17th, 2015, 04:56 AM   #2826
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They aren't expecting Bertha to start tunneling again until August.

At this rate, I don't think it will be done until 2020.
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Old March 17th, 2015, 05:01 AM   #2827
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They aren't expecting Bertha to start tunneling again until August.

At this rate, I don't think it will be done until 2020.
some progress - all because some shmack could not do his job right and forgot the metal pipes in the ground
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Old March 17th, 2015, 05:06 AM   #2828
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Using untested technology for such a project (this is the widest tunneling machine ever built) wasn't a great idea. The tunneling for the light rail has been much more successful because it was more conventional. But there's too much stuff done to scrap the whole thing now. It's Seattle's Big Dig.
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Old March 17th, 2015, 05:09 AM   #2829
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Quote:
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Using untested technology for such a project wasn't a great idea.
What untested technology?
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Old March 17th, 2015, 05:13 AM   #2830
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Bertha is the widest tunneling machine ever built, have you seen the size of that thing? It's a total monster.

Why didn't they use a more conventional TBM instead?
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Old March 17th, 2015, 05:20 AM   #2831
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I think the problem is just the geometry of TBM (circle) and the required geometry of a highway (rectangle)
Light-rail trains are narrow and tall, and usually only 2 tracks so it fits easily.
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Old March 17th, 2015, 05:30 AM   #2832
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The geography doesn't help either. There have been reports of buildings slightly sinking due to Bertha.

I still want to see this finished however because there are few alternatives to I-5 when going through downtown to go to points south or north. The current Alaskan Way does a decent job but it's risky due to the earthquake risks.
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Old March 17th, 2015, 07:08 AM   #2833
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Quote:
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Bertha is the widest tunneling machine ever built, have you seen the size of that thing?
No, Bertha is not the largest diameter tunnel boring machine ever built. Bertha's diameter is 17.45 meters. The TBM boring the Orlovski Tunnel is 19.25 meters in diameter. Anyway, being slightly larger does not make something new technology. It just makes it slightly larger.

Quote:
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Why didn't they use a more conventional TBM instead?
Bertha is a conventional TBM.
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Old March 17th, 2015, 10:57 AM   #2834
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OK. So what's the problem then?
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Old March 17th, 2015, 11:30 AM   #2835
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Quote:
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OK. So what's the problem then?
The problem is they got it stuck. Same thing happened in Bangalore last year with a much smaller 5.5 meter diameter TBM boring a tunnel for the Bangalore Metro.
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Old March 17th, 2015, 03:59 PM   #2836
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Quote:
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the bill for this repair is about 120 million $. I wonder who will pay the bill?
Large projects like this include some kind of risk reserve to cover unforeseen expenditures. It's likely that this repair and delay consumes all that reserved money (and more).
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Old March 18th, 2015, 07:46 AM   #2837
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Quote:
Originally Posted by ChrisZwolle View Post
Large projects like this include some kind of risk reserve to cover unforeseen expenditures. It's likely that this repair and delay consumes all that reserved money (and more).
Yes a repair like this would probably expend the contingency funds. Assuming a 15% contingency for the uncertainties with tunneling and the scope, you have about $465 million in reserve based on the $3.1 billion budget.

Looks like most is state and local funds with about $700 million from Uncle Sam.
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Old March 21st, 2015, 01:18 AM   #2838
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The diameter of Bertha has nothing to do with the incident that damaged its cutting head (pipes not properly mapped).

Using 2 smaller TBMs wouldn't have prevented the incident.

Using an even larger TBM wouldn't have changed the incident.

The whole hype about the diameter of Bertha is overblown. I know politicians and local newspaper love it, but it is unrelated to the current situation.
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Old March 21st, 2015, 03:25 AM   #2839
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The cutter head is being brought to the surface in sections. Here's a YouTube video of the first section being hauled up.

https://www.youtube.com/watch?v=pCyu...ature=youtu.be

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Old March 21st, 2015, 06:04 PM   #2840
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Seattle is a rich city and they can afford to fool around with such pet projects.
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