Author Topic: Florida Bridge collapse  (Read 7012 times)

RoadKingLarry

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Florida Bridge collapse
« on: March 15, 2018, 03:51:02 PM »
New Pedestrian bridge in Sweetwater Florida collapses on to road, multiple vehicle crushed.

http://www.miamiherald.com/news/local/community/miami-dade/west-miami-dade/article205316174.html

News reports said it was designed to withstand a Cat 5 hurricane and stand for 100 years.
Apparently it wasn't built to design specs.
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MechAg94

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Re: Florida Bridge collapse
« Reply #1 on: March 15, 2018, 04:14:15 PM »
Wow.  Collapsed onto a road where traffic was held up at a stop light.  Looks bad. 
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Fly320s

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Re: Florida Bridge collapse
« Reply #2 on: March 15, 2018, 04:32:39 PM »
One article I read says it was assembled overnight and today was the first day in service.

edit: Not one day old, but first built on Saturday.

I wonder if there was a bunch of weight on the bridge while it was being finished and before is was ready for the weight.
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dogmush

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Re: Florida Bridge collapse
« Reply #3 on: March 15, 2018, 04:33:38 PM »
Not even in service yet.  The large span was dropped in place very recently, but the approach steps/ramps weren't finished.

MechAg94

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Re: Florida Bridge collapse
« Reply #4 on: March 15, 2018, 04:36:13 PM »
It is very early, but a voice in the back of my head keeps asking if the corruption around the local Sheriff's office and the school district is more widespread. 

I wasn't sure if people were still alive trapped under the rubble or not...so I hate to get into that now. 
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Hawkmoon

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Re: Florida Bridge collapse
« Reply #5 on: March 15, 2018, 04:42:41 PM »
New Pedestrian bridge in Sweetwater Florida collapses on to road, multiple vehicle crushed.

http://www.miamiherald.com/news/local/community/miami-dade/west-miami-dade/article205316174.html

Designed as a cable-supported bridge, the $14.2 million bridge project was a collaboration between MCM Construction, a prominent Miami-based contractor, and Figg Bridge Design, based in Tallahassee.[/quote]
Doesn't look like a cable supported bridge to me. It's a truss. I don't think there's any way a cable-supported bridge can be built off-site and then hoisted into position all in one.

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MechAg94

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Re: Florida Bridge collapse
« Reply #6 on: March 15, 2018, 04:47:41 PM »
https://twitchy.com/gregp-3534/2018/03/15/mass-casualties-reported-after-brand-new-pedestrian-bridge-at-fiu-in-miami-collapses-photos-video/

This Twitchy thread has a video about half way down showing some footage of the span being put in place. 
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HankB

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Re: Florida Bridge collapse
« Reply #7 on: March 15, 2018, 05:13:09 PM »
One eye witness was being interviewed by Shep Smith on Fox and claimed that a large crane was holding a "piece of equipment" used to tension a cable; the crane's hook or cable broke, dropping the "piece of equipment" on the bridge and causing the collapse. We'll see what happens.

Bet the lawyers are furiously working to figure out who to sue - from the construction company to the programmers that made the FEA software the architect presumably used, and everyone in between.
« Last Edit: March 16, 2018, 09:27:01 AM by HankB »
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230RN

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Re: Florida Bridge collapse
« Reply #8 on: March 15, 2018, 05:19:50 PM »
Apparently live coverage from the air at a good angle.

https://youtu.be/93BQG71Mr68

Audio is kind of crazy, with repetitive beeps sometimes.

They've got at least two large cranes out there working it over.

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Re: Florida Bridge collapse
« Reply #9 on: March 15, 2018, 05:56:23 PM »
Ancillary FYI  "10 Worst" bridge collapses.

https://youtu.be/-IUkZmswYuc

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KD5NRH

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Re: Florida Bridge collapse
« Reply #10 on: March 15, 2018, 07:52:00 PM »
Doesn't look like a cable supported bridge to me.

Maybe that's what they forgot.

Quote
I don't think there's any way a cable-supported bridge can be built off-site and then hoisted into position all in one.

I can think of a couple ways.  Not practical ways, mind you, but that wouldn't stop government from insisting that contractors try them.

cordex

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Re: Florida Bridge collapse
« Reply #11 on: March 15, 2018, 08:09:41 PM »
I can think of a couple ways.
But where would they find that much used dental floss and chewing gum on such short notice?

KD5NRH

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Re: Florida Bridge collapse
« Reply #12 on: March 15, 2018, 08:31:55 PM »
But where would they find that much used dental floss and chewing gum on such short notice?

More of a question of how to transport ballasts big enough, since cable-supported bridges normally use giant deadman anchors for the cables.  If you're making a portable one, you need hundreds of tons of ballast to replace a couple tons of whatever buried in hundreds of tons of the ground off the ends.

Cable-stayed could be done, but they tend to be rather tall for a given span compared to a simple truss, so logistics of transport come into play.

Firethorn

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Re: Florida Bridge collapse
« Reply #13 on: March 15, 2018, 10:57:44 PM »
Designed as a cable-supported bridge, the $14.2 million bridge project was a collaboration between MCM Construction, a prominent Miami-based contractor, and Figg Bridge Design, based in Tallahassee.
Doesn't look like a cable supported bridge to me. It's a truss. I don't think there's any way a cable-supported bridge can be built off-site and then hoisted into position all in one.

The article says that the span was built next to the road, then they used a "mechanical transporter" to move it into place in one day, in order to minimize disruption.  Looking at the pictures, it's a device like what they used to move the space shuttle into position, or transport nuclear power station cores to their site - basically all wheel drive tractors with massive numbers of wheels/axles, with hydraulic lifts that allow the devices to keep what they're carrying level despite minor grades.  Also, to account for varying shapes for the object across multiple transports.

Well, it's certainly not minimized now.

As for truss vs suspension:
You don't have to have the cables above the bridge:
https://en.wikipedia.org/wiki/Millennium_Bridge,_London
Third video shows the theoretical completed bridge.  It's only seen a couple times, but it's definitely suspension.  Or perhaps, given the structure between the bridge bottom and the roof, a hybrid.
https://www.cnn.com/2018/03/15/us/fiu-pedestrian-bridge-stats-trnd/index.html


The bridge was supposed to be strong enough to survive without the suspension parts outside of hurricane conditions...

Hawkmoon

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Re: Florida Bridge collapse
« Reply #14 on: March 15, 2018, 11:04:00 PM »

Third video shows the theoretical completed bridge.  It's only seen a couple times, but it's definitely suspension.  Or perhaps, given the structure between the bridge bottom and the top, a hybrid.
https://www.cnn.com/2018/03/15/us/fiu-pedestrian-bridge-stats-trnd/index.html



No cable stays in place when it fell. The bridge shown in the time lapse is only half the total length -- there was going to be a second span to crosss a river next to the highway. I don't think the pylon and cables were in place yet.
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Firethorn

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Re: Florida Bridge collapse
« Reply #15 on: March 15, 2018, 11:06:00 PM »
Where did you see cables or suspension? I didn't see anything like that.

See the giant picture of the bridge I posted?  The big central tower with the poles?

btw, if you replace the img with https://s19.postimg.org/9kxyk1bo3/DX77gar_VAAAUBdw.jpg it'll shrink a bunch, it's a tad large of a picture right now.  Source I grabbed it from had resized it, sadly APS doesn't let me do that with images here.  It's native or nothing.

Hawkmoon

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Re: Florida Bridge collapse
« Reply #16 on: March 15, 2018, 11:40:31 PM »
The team that designed and built this thing has prior experience with their bridges collapsing:

http://www.dailymail.co.uk/news/article-5507475/Two-construction-cos-Miamis-instant-bridge-collapses-violations.html

Good photo from the article showing the segment that collapsed. It is only half the total length, and doesn't have any cables attached. Those have to be tensioned symmetrically, so that part of the operation would have happened after the other span was erected.

« Last Edit: March 16, 2018, 08:17:07 AM by Hawkmoon »
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K Frame

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Re: Florida Bridge collapse
« Reply #17 on: March 16, 2018, 06:48:20 AM »
And holy *expletive deleted*it the anti-Trumpers are coming out of the frigging woodwork to blame the collapse on him...

I've seen some stuff from the left over this that's just... unfreakingbelievable.
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Hawkmoon

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Re: Florida Bridge collapse
« Reply #18 on: March 16, 2018, 08:18:13 AM »
And holy *expletive deleted*it the anti-Trumpers are coming out of the frigging woodwork to blame the collapse on him...

I've seen some stuff from the left over this that's just... unfreakingbelievable.

And they accused the Obama "birthers" of being delusional!
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MechAg94

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Re: Florida Bridge collapse
« Reply #19 on: March 16, 2018, 09:11:59 AM »
http://www.mammoet.com/

A neighboring site just built a large chemical plant and they were using those multi-wheeled crawlers to move heavy equipment in.  Mammoet was the company doing all the rigging and heavy moving.  They actually built up a barge dock a couple miles away on the Intercoastal and rolled the heavy equipment in from there at night.  They put in a temporary heavy bridge across a canal as well.
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MechAg94

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Re: Florida Bridge collapse
« Reply #20 on: March 16, 2018, 09:13:46 AM »
And holy *expletive deleted*it the anti-Trumpers are coming out of the frigging woodwork to blame the collapse on him...

I've seen some stuff from the left over this that's just... unfreakingbelievable.
I wonder if anyone has suggested the bridge was shot with an AR15 yet? 
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Perd Hapley

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« Last Edit: March 16, 2018, 09:44:17 AM by fistful »
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Frank Castle

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Re: Florida Bridge collapse
« Reply #22 on: March 16, 2018, 03:09:50 PM »
 Only people over 21 should be allowed to use bridges.

But seriously which politician got kickback from hiring this company ?

TechMan

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Re: Florida Bridge collapse
« Reply #23 on: March 16, 2018, 03:20:30 PM »
Only people over 21 should be allowed to use bridges.

But seriously which politician got kickback from hiring this company ?

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dogmush

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Re: Florida Bridge collapse
« Reply #24 on: March 16, 2018, 03:21:16 PM »
Only people over 21 should be allowed to use bridges.

But seriously which politician got kickback from hiring this company ?

It's Miami-Dade.  All of them.