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Old February 20th, 2013, 12:25 PM   #9041
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That is a mere 2km away from home

There are some large bridges of that navigation canal in Tilburg that are barely used. They were meant for expressways or fast/wide links never completed. Unfortunately, the leftist population of the city in the 1970s killed those projects.

This is one example: http://goo.gl/maps/bMFPa . There is a whole ROW all the way to the ring road, but they are now building new flats over it (easily seen on that link, direction NW)

The new ring road (sector West) posted by Chris did reduce noticeably traffic on the former link. Now it is fairly easy to drive from A58 to A261 and to/from Dongen.
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Old February 20th, 2013, 01:11 PM   #9042
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Wow, that eco-crossing does look nice!
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Old February 20th, 2013, 01:51 PM   #9043
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IJssel River bridges, Zwolle

I took a few photos this morning of the two IJssel River bridges at Zwolle.

The arch bridge opened in 1930 and was the first large arch bridge in the Netherlands. The box girder bridge opened in 1970 as a part of the A28 motorway.

1.
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Zwolle-1 by Chriszwolle, on Flickr

2.
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Zwolle-2 by Chriszwolle, on Flickr

3.
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Zwolle-3 by Chriszwolle, on Flickr

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Zwolle-4 by Chriszwolle, on Flickr
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Old February 20th, 2013, 03:04 PM   #9044
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A4 Delft - Schiedam

A few pictures from last sunday. More here.
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Old February 20th, 2013, 05:45 PM   #9045
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Still sad to think they had to lose all this time just to remove the enbankment already in place and ready to get paved over.
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Old February 20th, 2013, 06:17 PM   #9046
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A4 Steenbergen

There is another missing link of A4 under construction a bit farther to the south, around the town of Steenbergen.

Here are some aerial photos taken this month by Joop van Houdt / Rijkswaterstaat.











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Old February 21st, 2013, 11:33 PM   #9047
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Nice to see these beautiful aerial updates of that part of the A4 under construction as well.
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Old February 23rd, 2013, 10:55 PM   #9048
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True. It has taken way too long before they even started.
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Old February 23rd, 2013, 10:58 PM   #9049
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I see water filling the excavated trenches. How do they deal with that normally? Will they use the existing parallel ditches as outlets for that water? Are there problems with too high water table there?
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Old February 23rd, 2013, 10:59 PM   #9050
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Usually there is a full time waterpump I believe!
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Old February 23rd, 2013, 11:25 PM   #9051
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Ground water levels are very high in the Netherlands, in fact the Netherlands has the wettest soil of all of Europe. These ditches are for no other reason than to drain the area of excess water.

A common method of construction is using under water concrete. That way they don't have to attempt to keep the construction site dry. This usually only works in areas with sand soils, the A2 tunnel at Maastricht is a good example of that, even though they do need to pump a lot in that area. The downside of pumping is that ground water levels drop and some minor ground subsidence can occur.
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Old February 24th, 2013, 11:26 PM   #9052
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Quote:
Originally Posted by Suburbanist View Post
I see water filling the excavated trenches. How do they deal with that normally? Will they use the existing parallel ditches as outlets for that water? Are there problems with too high water table there?
If I understand correctly (Dutch members can provide more info), because so much of the Netherlands is below sea level, the water table level is very near the surface. As a result, if excavations are required, it's normal to have water seep into said excavation.

As for how it's dealt with, the answer is obvious. A series of pumps would be used to deal with the water, given that this is a very common issue in all aspects of construction in general.
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Old February 25th, 2013, 10:57 AM   #9053
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The bottom line is that the Western half of the country is marshland. So you can't dig a hole without running into water. Literally. You go a foot deep and water starts to come up.

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Old February 25th, 2013, 04:46 PM   #9054
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Aquaduct Drachtsterweg, Leeuwarden

Fryslân province signed a construction contract today in Leeuwarden to construct a 4-lane aquaduct under the Van Harinxma Canal in Leeuwarden. The new aquaduct is located on the southern side of Leeuwarden and will carry traffic from N31 to the city. The current bridge carries 36 000 vehicles per day and is severely exceeding its capacity. The new aquaduct will carry 48 000 vehicles per day. In addition, a grade-separated interchange will be constructed south of the aquaduct. The new aquaduct will open to traffic in 2016.

This is one of four aquaducts currently under construction along the Van Harinxma Canal, three of them being in the city of Leeuwarden.

location @ Google Maps

Video:
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Old February 25th, 2013, 09:28 PM   #9055
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Is it really proper to call roads "aquaducts" in English? It sounds very weird and I've never heard it outside this forum. In my understanding the word only refers to the ancient water delivery systems...
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Old February 25th, 2013, 09:31 PM   #9056
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Nearly no other country has road aquaducts, that's why the term is hardly ever used for such constructions internationally. The Netherlands has 29 aquaducts completed or under construction.

Aquaducts are separated from tunnels because their enclosed sections are shorter (generally less than 250 m and often less than 100 m). The Netherlands also has many river tunnels, but these are never called aquaducts.

Their function are not that different from ancient Roman aquaducts. They carry water over other things, usually roads in the Netherlands (there are two aquaducts across railways as well).

I guess they could be called underpasses or dive-unders, but they are quite different in appearence from such constructions.

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Akwadukt Mid-Fryslan-7 by Chriszwolle, on Flickr
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Old February 25th, 2013, 10:11 PM   #9057
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I'm just curious, where on this Akwadukt is the sea level (0.00 meters above the sea level)? Is the sea level equal to the water level on it?
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Old February 25th, 2013, 11:31 PM   #9058
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According to this website: http://ahn.geodan.nl/ahn/viewer3/index.html the top edge of the akwadukt lies around sea level. The water in the canal that flows trough it is actually about 50cm below sea level. The bottom of the road appears to be around 10 meters below sea level.
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Old February 26th, 2013, 04:53 AM   #9059
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Quote:
Originally Posted by ChrisZwolle View Post
Nearly no other country has road aquaducts, that's why the term is hardly ever used for such constructions internationally. The Netherlands has 29 aquaducts completed or under construction.

Aquaducts are separated from tunnels because their enclosed sections are shorter (generally less than 250 m and often less than 100 m). The Netherlands also has many river tunnels, but these are never called aquaducts.

Their function are not that different from ancient Roman aquaducts. They carry water over other things, usually roads in the Netherlands (there are two aquaducts across railways as well).

I guess they could be called underpasses or dive-unders, but they are quite different in appearence from such constructions.
Ok, now I understand. Strictly speaking an aquaduct would be not the road itself or the tunnel but the artificial water channel above it as shown in your picture. In common usage the whole construction is reffered to as aquaduct.

Indeed there aren't too many other places where something like this would be needed/possible.
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Old February 26th, 2013, 06:25 AM   #9060
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I think it would be nicer to call the raod as aqueduct underpass or something like that and the construction itself as aqueduct. It is weird to read that aqueduct carries xy vehicles... when aqueduct in fact carries only the water. But it’s not that important.
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