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The Melkweb Bridge

Posted December 13, 2012 8:52 AM

From Neatorama:

This freaky and beautiful bridge is located in Purmerend, the Netherlands. The lower level is for bicycles and the top level is for pedestrians:This deck was designed as a pendulum over the water, so that the slope could be limited to a minimum. Because pedestrian traffic was separated from cyclists, the direct line between the Melkweg-road and city centre could remain. Furthermore the 48m arch remains the fastest possible way to cross the water.The pedestrian bridge weighs 85 tons, consists of 130 steps and is supported by a steel arch. The design makes it able to retain the spatial openness of the channel and its surroundings. Both bridge sections flow smoothly into each other and form one whole. This unity is enhanced by the continuity of materials and colors. In the edges of the bridge LED lines are applied that follow the contour of the bridge and guarantees a spectacular view on the bridge even after sunset.

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#1

Re: The Melkweb Bridge

12/13/2012 3:57 PM

Can anyone explain to me why this is not just a "monumental" waste of money?

I can see no practical reason, nor any need, for such an expensive structure.

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#2
In reply to #1

Re: The Melkweb Bridge

12/13/2012 4:43 PM

It's an engineered attraction, and a lot more practical and functional than other structures I could mention.

There are other similar separating designs for roadways and bridges which are also engineered more for attraction than for cost and efficiency.

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#3
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Re: The Melkweb Bridge

12/13/2012 5:01 PM

Let's design a bridge over the channel. Keep it simple, but wide, to move both pedestrian an bicycle traffic.
Cost
: Euro 1.000.000,00

Let's design the bicycle bridge so it coils over the water to create sufficient length to limit the angle of inclination of the bicycle path. The section that opens is divided diagonally and consists of two revolving bridge decks. Oh, and an arched walkway on top, it's got to have one of those. We'll call it an engineered attraction!

Cost: Euro 6.000.000,00

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#5
In reply to #3

Re: The Melkweb Bridge

12/13/2012 5:37 PM

Just consider if modern art that actually performs a useful function.

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#12
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Re: The Melkweb Bridge

12/14/2012 4:09 AM

One could say the same about the Eiffel Tower, Nelson's Column, the Statue of Liberty, the CN Tower, etc., etc......

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#13
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Re: The Melkweb Bridge

12/14/2012 4:14 AM

Don't try to confuse me with facts!

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#16
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Re: The Melkweb Bridge

12/14/2012 12:18 PM

I can see several reasons that this is not a monumental waste of your money from just the pictures provided. And as everyone here knows, I'm not a civil engineer.

  • The approaches to this bridge fit very neatly between roadway and drainage ditch on each side of the bridge. While the ditch could probably be moved at low cost the roadway and city infrastructure would be very costly to move and are likely the actual reason for having this bridge in the first place.
  • The load points for this dual bridge reside inside the waterway. As such the reinforcing of the waterway banks were minimized. The proximity to bedrock below the waterway may have made this the most cost effective load points. The relatively short distance between water and ground levels imply to me that this is a controlled waterway like a canal. So I expect excessive rip-wrap is not needed.
  • The pedestrian step bridge that requires less rotational support on the base due to the high arc and presumed lower traffic load mass is always available when the lower bridge is open to boat traffic.
  • The most important reason, they did not spend your money. They spent their money after going through their proper political channels.
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#17
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Re: The Melkweb Bridge

12/14/2012 12:31 PM

I NEVER made any reference to MY money.

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#4

Re: The Melkweb Bridge

12/13/2012 5:23 PM

It looks like modern art.

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#9
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Re: The Melkweb Bridge

12/13/2012 11:21 PM

so does Munch's paintings. more interesting and alot cheaper.

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#10
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Re: The Melkweb Bridge

12/13/2012 11:40 PM

I'm not sure about the "cheaper"; I think a copy of "The Scream" sold for more than that at recent auction.

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#18
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Re: The Melkweb Bridge

12/16/2012 1:20 PM

And unlike a bridge you cannot walk on it (they get really upset if you try).

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#6

Re: The Melkweb Bridge

12/13/2012 7:56 PM

"...the top level is for pedestrians:This deck was designed as a pendulum over the water, so that the slope could be limited to a minimum." I've puzzled over this a while and can only guess what this means.

"A pendulum over the water'??? But it does not appear to move, not does it look like a pendulum. "So the slope could be limited to a minimum"??? Looks pretty steep to me. The center section appears to be 4X the height of an average person, which is much higher than it needs to be, I think, unless they want to accomodate stilt walkers.

By 'deck' do they mean the lower level? By 'pendulum' do they mean it zig-zags so that there is a single point where the upper section crosses the lower section? But why cross at all?

You can't completely separate the bicyclists from pedestrians since some people can't climb stairs, and other people need to push strollers or use wheelchairs. So why not just build one wide span with a section marked for cyclists and another section marked for pedestrians and another section where people have benches to sit on?

But hey, it looks cool in a post-modern sort-of 'this will go out of style in 20 years' kind of way.

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#7
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Re: The Melkweb Bridge

12/13/2012 8:47 PM

And, they had 6,000,000.00 Euros to spend.

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#8

Re: The Melkweb Bridge

12/13/2012 9:53 PM

Both the engineering and the editing are weird.

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#11

Re: The Melkweb Bridge

12/14/2012 2:00 AM

Typical of what happens when the "powers that be" start to forget where the public money comes from and listen too closely to the artists, artisans, architects, greenies, "sustainable development" types and general socialist freeloaders in the population, who all want to leave their footprints in the sands of time by this kind of waste. And god forbid, not on their dime!!

And don't forget to put some moving parts in it, too, so it can employ some government hack for the next century to operate the swing span when a boat comes along once a day.

As someone else pointed out, it will likely be out of style in 20 years.

Jon.

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#14

Re: The Melkweb Bridge

12/14/2012 8:41 AM

I'd say "pendulum" is a mis-translation of "swing bridge". The sketches below are from Contemporist, showing the cycle bridge open for tall vessels to pass. Photos of the bridge open would've been nice.

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#15
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Re: The Melkweb Bridge

12/14/2012 8:52 AM

Breaks in the middle and swings horizontally, like a pendulum.

I think you've got it.

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