Bridge Collapse (Page 11): It's going to be interesting to find out (hopefully), if there is still a viable anchor on the end of that chain which just dragged along the bottom, in a...

dustie Loc: Nose to the grindstone

srt101fan wrote:

Why do you say that dropping the anchor didn't happen? Photographs clearly show an anchor chain on the port side....

It's going to be interesting to find out (hopefully), if there is still a viable anchor on the end of that chain which just dragged along the bottom, in a typical emergency slowdown attempt procedure, or if that anchor did catch solidly enough on something to distort/break off part of the anchor or separate it from the chain.

There is a whole lot of curious stuff that hopefully is eventually made accessible publicly, after there has been time for staff on scene to find out the particulars.

dustie Loc: Nose to the grindstone

dwermske wrote:

The head of the NTSB went on to say that the bridge was one of hundreds in the US that would not withstand even the slightest failure without total failure. There were no secondary support mechanisms built into this bridge.

It's not like Costco or Walmart roof truss systems that have multiple trusses supported by walls over the width of the building.

How, where, would any other trusses and supports be placed within the perimeter foot print of that continuous truss bridge section, so that there are standby trusses and supports just waiting for Murphy to happen?

dustie Loc: Nose to the grindstone

dwermske wrote:

I hope you don't think that 8mph is a high rate of... (show quote)

Maybe the information the NTSB has so far publicly reported is "snapshots" at "intervals" in giving times of critical events and audio, as they provide information to a curious public that wants to know.

Where is the information that the voice/data recorder that was retrieved from the ship is very primitive and does not do continuous recording? (Except for the loss of sensor data recording that occured in the power failure because there was no power to those sensors. The audio recording from the ship bridge did not stop during power failure, because it is powered by it's own power supply which functions during power outage, right?)

dwermske

The information regarding the Black Boxes on marine vessels being obsolete when compared to the Black Boxes in aircraft; was reported by the NTSB during a live news conference (Fox News). She went on to say that they have been debating for a number of years as to whether they should mandate marine black boxes be upgraded to equipment equivalent to the black boxes required on aircraft. Notice that the statement was the marine black boxes were obsolete WHEN COMPARED to the current black boxes on aircraft.

TriX Loc: Raleigh, NC

dwermske wrote:

The information regarding the Black Boxes on marin... (show quote)

Well we have the audio track from the bridge, the course, position, speed, probably rudder angle and that the anchor (at least on the port side) was deployed. We know there was a power failure, but it seems to me, the big question is what caused the electrical failure.

If I understand correctly, large cargo vessels have electro-hydraulic steering where electrical controls regulate hydraulic pressure on the rudder. From my understanding, there are one or two main diesel engines that drive the props and several diesel generators (typically 3) that provide electricity as well as a backup electric generator. What puzzles me is how all these electrical generators or associated switchgear failed, causing the crew to lose control of the rudder and the main engines so that could neither steer or reverse the engines. We’re “lucky” there was no fire and the vessel isn’t flooded, so hopefully the cause will eventually be found.

robertjerl Loc: Corona, California

dustie wrote:

How big was the ship in the movie?

The behemoths carrying containers nowadays, if they need anchors in normal circumstances, are going to use them when they are outside the port/bay/harbor, waiting for space and their turn to enter after others have cleared out.

The anchors don't do them any holding in position service where they are restrained by mooring lines in the dock.

Since the movie was pre-war and supposedly took place around 1930 the ships were probably in the 300-400 foot range. Before the war only large warships and liners were much bigger, maybe a few tankers, but nowhere near the size of today's huge tankers, some of them make the Dali look small.

dustie Loc: Nose to the grindstone

robertjerl wrote:

Since the movie was pre-war and supposedly took place around 1930 the ships were probably in the 300-400 foot range. Before the war only large warships and liners were much bigger, maybe a few tankers, but nowhere near the size of today's huge tankers, some of them make the Dali look small.

Oh, yeah. The Dali is definitely not one of the big kids on the block!

clint f. Loc: Priest Lake Idaho, Spokane Wa

dustie wrote:

I'd be interested in seeing photo/video info on that.

I’d like to see how you deploy 4 anchors. I have enough trouble with one.

bbrown5154 Loc: Baltimore, MD

Mr. SONY wrote:

You won't have to worry about taking that bridge, it's gone.
There were a few cars and trucks on the bridge when it collapsed.
They have it all recorded.

Fortunately the container ship called out a mayday and had the bridge closed before it collapsed. You can see the last tractor trailer making it across by the skin of its teeth.
The cars and unfortunately people who fell from the bridge were workers fixing potholes.

robertjerl Loc: Corona, California

bbrown5154 wrote:

Fortunately the container ship called out a mayday and had the bridge closed before it collapsed. You can see the last tractor trailer making it across by the skin of its teeth.
The cars and unfortunately people who fell from the bridge were workers fixing potholes.

6 workers, the two pulled out alive fairly quickly, the two found dead in their pickup truck after trying to get away when they got dumped in the water as the bridge went down and 2 still unaccounted for.

dustie Loc: Nose to the grindstone

clint f. wrote:

I’d like to see how you deploy 4 anchors. I have enough trouble with one.

Oh, well.......
.......could you try weaving all four lines together in a nice four-strand braid, so, maybe it wouldn't increase the troubles?........much

BebuLamar

robertjerl wrote:

6 workers, the two pulled out alive fairly quickly, the two found dead in their pickup truck after trying to get away when they got dumped in the water as the bridge went down and 2 still unaccounted for.

4 unaccounted for. 8 workers total. 2 found quickly. 6 was missing and 2 bodies were found days later.

dwmoar Loc: Oregon, Willamette Valley

SuperflyTNT wrote:

That’s the nature of a suspension bridge. One part goes the entire bridge goes. As for protecting the towers the rebuilt Sunshine Skyway bridge after its collapse has concrete “islands” that won’t let a boat near, but I doubt they have that kind of space in Baltimore Harbor.

Sorry it is not a suspension bridge in any means or form. The Francis Scott Key Bridge, was a truss style bridge. Trusses are usually triangular structures that interlock and support the bridge. They were among the most common types of long-distance bridges built in America for much of the mid-20th century before going out of vogue in the 1980's.

dwmoar Loc: Oregon, Willamette Valley

Kiron wrote:

In remarks delivered from the White House, President Biden...vowed that the federal government would pay for the cost of rebuilding the bridge. Meaning we taxpayers.

So what.... This disaster will cost the economy millions of dollars. Why is it OK for the federal government to come to the aid of those that are effected by hurricanes or other mishaps and yet they shouldn't help aid in rebuilding after a bridge collapse. How about not complaining about the federal government coming to the aid of a disaster such as this.

dwmoar Loc: Oregon, Willamette Valley

SuperflyTNT wrote:

Totally different thing. It was a suspension bridge and that’s pretty much what’s gonna happen if you take out one tower. It was a pretty standard type of design. As for tugs, they were used to move it from the dock out into the harbor, but from their harbor pilots are pretty much the standard now. Those big ports are too busy for tugs.

It was not a suspension bridge it is a truss style bridge.