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Author Topic: Alaskan Way Viaduct Replacement Tunnel  (Read 119816 times)

Bruce

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #750 on: May 16, 2019, 12:40:47 AM »

An aerial shot that was posted by a random Twitter user.


Bickendan

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #751 on: May 16, 2019, 06:16:52 AM »

Quick! Someone film a sequel to Speed and jump an articulated trolley bus!!!
(It's Hollywood; they'll handwave it)
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Sub-Urbanite

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #752 on: May 16, 2019, 01:40:08 PM »

By god it does look like a totally different city
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jakeroot

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #753 on: May 16, 2019, 02:57:43 PM »

Great photos from WSDOT from the ground...the changes are especially noticeable down there:

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rte66man

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #754 on: May 22, 2019, 09:05:02 PM »

So where are they disposing of all that steel?  I'm assuming the concrete is being crushed and recycled.
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jakeroot

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #755 on: May 22, 2019, 09:34:56 PM »

So where are they disposing of all that steel?  I'm assuming the concrete is being crushed and recycled.

Concrete is going to fill the closed Battery Street Tunnel. Not sure about the steel.

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Beltway

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #756 on: May 22, 2019, 09:58:32 PM »

So where are they disposing of all that steel?  I'm assuming the concrete is being crushed and recycled.
Concrete is going to fill the closed Battery Street Tunnel. Not sure about the steel.

That looks like aggregate base material.  Filling the whole invert with concrete would be super-expensive.  Earthen fill could handle most of the backfilling necessary.
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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #757 on: May 22, 2019, 10:41:53 PM »

That looks like aggregate base material.  Filling the whole invert with concrete would be super-expensive.  Earthen fill could handle most of the backfilling necessary.

They're filling the tunnel with the rubble concrete from the viaduct.
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Beltway

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #758 on: May 22, 2019, 11:12:45 PM »

That looks like aggregate base material.  Filling the whole invert with concrete would be super-expensive.  Earthen fill could handle most of the backfilling necessary.
They're filling the tunnel with the rubble concrete from the viaduct.

Oh OK … rubblized concrete would look somewhat like aggregate base material.

That is putting it to good use!
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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #759 on: May 22, 2019, 11:49:50 PM »

That looks like aggregate base material.  Filling the whole invert with concrete would be super-expensive.  Earthen fill could handle most of the backfilling necessary.

They're filling the tunnel with the rubble concrete from the viaduct.
And then earth to complete the fill, I imagine.

Beltway

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #760 on: May 23, 2019, 12:02:05 AM »

That looks like aggregate base material.  Filling the whole invert with concrete would be super-expensive.  Earthen fill could handle most of the backfilling necessary.
They're filling the tunnel with the rubble concrete from the viaduct.
And then earth to complete the fill, I imagine.

Probably, depending on how much concrete there is in the viaduct.
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jakeroot

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #761 on: May 23, 2019, 12:05:49 AM »

Here's an image from WSDOT's website:

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Beltway

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #762 on: May 23, 2019, 12:49:01 AM »

4,000 Ready Mix truck loads of concrete?  Wow... that will be expensive. 

About 10 cubic yards in the average size truck.

That is the equivalent amount … they are going to set up a central mix plant on the site and produce the concrete there.
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jakeroot

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #763 on: May 23, 2019, 12:06:14 PM »

I don't know if setting up shop on site would be more or less expensive than trucking in all the cellular concrete. Based on the density of the area, and the number of affected businesses and homes, they're probably just going for the one that is least noisy or disruptive.
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Beltway

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #764 on: May 23, 2019, 01:55:20 PM »

I don't know if setting up shop on site would be more or less expensive than trucking in all the cellular concrete. Based on the density of the area, and the number of affected businesses and homes, they're probably just going for the one that is least noisy or disruptive.

If the equivalent of 4,000 Ready Mix trucks of concrete is needed in a specific location, several blocks of street in this case, the central mix plant will be considerably less expensive per cubic yard of concrete, assuming that there is enough space to set it up, which of course would be temporary.

There are several different types --
https://www.vincehagan.com/central-mix-concrete-batch-plants/
 
« Last Edit: May 23, 2019, 01:59:36 PM by Beltway »
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jakeroot

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #765 on: May 23, 2019, 02:16:32 PM »

I don't know if setting up shop on site would be more or less expensive than trucking in all the cellular concrete. Based on the density of the area, and the number of affected businesses and homes, they're probably just going for the one that is least noisy or disruptive.

If the equivalent of 4,000 Ready Mix trucks of concrete is needed in a specific location, several blocks of street in this case, the central mix plant will be considerably less expensive per cubic yard of concrete, assuming that there is enough space to set it up, which of course would be temporary.

There are several different types --
https://www.vincehagan.com/central-mix-concrete-batch-plants/

Cool, thanks for the link. Sounds like a win-win for everyone. Assuming the mixing process isn't incredibly noisy. Though even then, I doubt it could be any louder than the noise produced by the traffic in the old tunnel, coming up through the vents.
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Beltway

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #766 on: May 23, 2019, 02:51:50 PM »

Cool, thanks for the link. Sounds like a win-win for everyone. Assuming the mixing process isn't incredibly noisy. Though even then, I doubt it could be any louder than the noise produced by the traffic in the old tunnel, coming up through the vents.

Cellular concrete as about 1/3 the density of structural concrete, but the production is still fairly similar.

http://www.cellularconcreteinc.com/

Cellular Concrete is a low-density fill material primarily used in geotechnical applications.  The Lightweight Cellular Concrete is made by the injection (or blending) of a pre-formed stable foam into a cement-based slurry.
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The Ghostbuster

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #767 on: May 23, 2019, 03:24:09 PM »

Now we have to see how well the new tunnel will hold up when Seattle has its next earthquake. Since they can't be predicted, we might be in for a very long wait.
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jakeroot

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #768 on: May 23, 2019, 06:16:57 PM »

Now we have to see how well the new tunnel will hold up when Seattle has its next earthquake. Since they can't be predicted, we might be in for a very long wait.

The tunnel was designed to move with the dirt around it. I don't understand all the engineering, but it's probably going to be the safest place to be in an earthquake. Since the ground is what's moving, being inside the ground should be optimal.
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Bruce

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #769 on: May 23, 2019, 11:26:48 PM »

Now we have to see how well the new tunnel will hold up when Seattle has its next earthquake. Since they can't be predicted, we might be in for a very long wait.

The tunnel was designed to move with the dirt around it. I don't understand all the engineering, but it's probably going to be the safest place to be in an earthquake. Since the ground is what's moving, being inside the ground should be optimal.

Most of the danger from earthquakes comes from other structures falling onto you. Being in a tunnel helps minimize that, compared to say Pioneer Square (where most of the buildings have tons of brick masonry that will come crashing down).

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #770 on: May 23, 2019, 11:52:41 PM »

Now we have to see how well the new tunnel will hold up when Seattle has its next earthquake. Since they can't be predicted, we might be in for a sudden strike at any time.

FIFY.  It has been 319 years and counting since the last one.  Might want to check intervals between Cascadia Subduction Zone quakes before playing the "long time to go" card.  For those of us in the PNW, we are playing a game of You Bet Your Life, no matter whether you are aware of the hazard or just an ostrich.

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Bruce

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #771 on: May 24, 2019, 02:14:05 AM »

Demolition timelapse from a Western Avenue office building:

Bickendan

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #772 on: May 24, 2019, 05:36:21 AM »

Amazing how the removal of an icon like that improves everything.
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Bruce

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #773 on: June 12, 2019, 03:24:26 PM »

Tolling is delayed until fall due to missed deadlines from the tolling vendor.

jakeroot

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Re: Alaskan Way Viaduct Replacement Tunnel
« Reply #774 on: June 12, 2019, 06:02:31 PM »

Tolling is delayed until fall due to missed deadlines from the tolling vendor.

Dammit. The congestion is getting worse, so I was looking forward to a toll, to get some relief.
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