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Old December 22nd, 2013, 09:14 PM   #2661
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A tunnel longer than 11 km would be necessary.

And I am not sure about the quality of the ground for digging...
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Old December 22nd, 2013, 09:14 PM   #2662
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Probably due to the length. A tunnel would have to be at least 11 kilometers long and twin-tube. The island is volcanic in nature, I don't know if that would pose any geologic problems with regards to tunnel construction.
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Old December 22nd, 2013, 09:38 PM   #2663
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At 11 kilometers, length would not be a problem. I might be wrong, but I would expect volcanic rock would be a nearly ideal material for tunnel boring.
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Old December 22nd, 2013, 10:04 PM   #2664
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Quote:
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At 11 kilometers, length would not be a problem. I might be wrong, but I would expect volcanic rock would be a nearly ideal material for tunnel boring.
Not if there is still some volcanic activity at a relative low depth.
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Old December 22nd, 2013, 10:08 PM   #2665
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What about securing the cliffs above the road? It's something done all the time and not so expensive.
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Old December 22nd, 2013, 10:29 PM   #2666
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According to French Wikipedia about this subject; http://fr.wikipedia.org/wiki/Route_du_Littoral the cliffs are geologically unstable with 19 fatalities due to rockslides since opening (data goes up to 2008). Netting is installed at most locations, but doesn't prevent all rockslides and makes the road expensive to maintain.

Furthermore, the area is subject to flooding an average of 64 days per year. This may be direct cyclone impact, but also high surf from distant cyclones that floods the road.

N1 is the only connection between the capital Saint-Denis and communities on the western side of the island. The nearest cross-island route is via Col de Bellevue, located 65 kilometers to the south. Especially between Saint-Denis and Le Port, the detour is 160 kilometers, while the normal distance is only 20 kilometers.
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Old December 22nd, 2013, 11:28 PM   #2667
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ChrisZwolle do you speak French ?
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Old December 23rd, 2013, 12:08 AM   #2668
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Quote:
Originally Posted by italystf View Post
Not if there is still some volcanic activity at a relative low depth.
There are two active volcanoes on the island, but neither is nearby. The nearer of the two is at the center of the island.

Quote:
Originally Posted by ChrisZwolle View Post
Furthermore, the area is subject to flooding an average of 64 days per year.
If tunnels were to slope upward from each end to a higher elevation in the middle, then any water leaking in would flow out (under each carriageway).
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Old December 23rd, 2013, 11:15 AM   #2669
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Quote:
Originally Posted by ChrisZwolle View Post
Furthermore, the area is subject to flooding an average of 64 days per year. This may be direct cyclone impact, but also high surf from distant cyclones that floods the road.
I was thinking of that, tropical cyclones. I believe the new road won't escape to storm surge of them.
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Old December 23rd, 2013, 03:11 PM   #2670
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The new route is elevated, so it's much less likely impacted by flooding than the current route.
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Old December 23rd, 2013, 08:45 PM   #2671
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Quote:
Originally Posted by ChrisZwolle View Post
Launch of the Nouvelle Route du Littoral coastal highway on Reunion Island, including France's longest offshore viaduct
A render of this project:

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Old December 23rd, 2013, 09:15 PM   #2672
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A75

One of my favorite motorways in Europe. A75 in southern France.

image hosted on flickr

A75 "La Méridienne" - Lodève (France) by Meteorry, on Flickr
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Old December 29th, 2013, 09:24 PM   #2673
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A51 motorway in southern France, from its beginning close to Marseille to its end (more like an interruption) south of Gap.

Sadly I ran out of battery and I couldn't film the last 10 kilometers.





Plans to join it with the stretch south of Grenoble seem to be definitely abandoned.
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Old December 30th, 2013, 07:01 PM   #2674
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Bris has posted this on SSP:

Quote:
Originally Posted by New Brisavoine View Post
The official launch of construction for the Nouvelle Route du Littoral freeway/motorway, in Réunion, took place on Friday last week. After many years of discussions and heated public debates, this is at last the start of the most spectacular motorway project in the European Union! [img]http://i39.************/200tfmc.gif[/img]

Due to a massive lava field which ends in cliffs above the ocean, the capital of Réunion, St Denis, is isolated from the international seaport of Réunion and the touristy and populated southern part of the island, located beyond the lava field. It has always been hard to link St Denis to the seaport and the southern part of the island through that lava field.

Currently, there exists a motorway that was built in the 1970s at the bottom of the cliffs, but it is extremely dangerous, with tons of volcanic rocks regularly crashing on the road, sometimes killing motorists, and blocking traffic for weeks between St Denis and the rest of the island.

This is the current motorway:













And this is what happens when the cliff collapses on the current motorway:





Oftentimes, due to risk of rocks falling on the motorway, they have to redirect northbound traffic on the southbound lanes (the two lanes on the ocean side), so the motorway becomes a simple two-lane road, with all the traffic jams that you can imagine.



Some solutions have been sought to solve this problem. Some have argued in favor of a tunnel bored under the lava field, but the distance to cross is very long for a tunnel, and the road tunnel would in any case be dangerous due to the heavy traffic on that motorway (55,000 vehicles per day in 2010, but due to rise to 80,000 vehicles per day in 2040 because of Réunion's brisk demographic and economic growth).

Eventually, after years of public consultations and political arguments, it was decided to choose the offshore viaduct solution, which will be an engineering marvel, but will cost a lot of money. It must be said that construction of the offshore viaduct has become a reality essentially thanks to the efforts of the right-wing president of Réunion's regional council, Didier Robert, who came to power in 2010 and has tenaciously pushed for this very costly engineering solution (the former Communist president of the regional council was opposed to an offshore viaduct, and favored a tram-train solution through the lava field). Didier Robert managed to convince the French state and the European Union despite the dire state of public finances.

The Nouvelle Route du Littoral ("New Coastal Road") will be 12.3 km (7.6 miles) long. It will be a 6-lane motorway (the current Route du Littoral under the cliffs is only a 4-lane motorway). It will cost 2.23 billion US dollars ($180 million per km/$290 million per mile). The French state will contribute 1.07 billion US dollars, Réunion's regional council will contribute 915 million US dollars, and the European Union will contribute 207 million US dollars. Despite its cost, the Nouvelle Route du Littoral motorway will be toll free!

5.4 km of the 12.3 km will be the offshore viaduct proper. This is 2.5 times the length of the Golden Gate Bridge in San Francisco, and slightly more than two-third the length of the Oresund Bridge between Sweden and Denmark. The width of the 6-lane viaduct will be 28.9 meters (95 ft), which is larger than the width of both the Golden Gate Bridge (27.4 m/90 ft) and the Oresund Bridge (23.5 m/77 ft). The viaduct will run parallel to the coast at a distance of more than 60 meters (200 feet) from the coast, in order to be out of reach of the worst possible cliff collapse. At that distance from the coast, the ocean floor is between 10 and 15 meters below the surface of the ocean.

The deck of the viaduct, where motorists will be driving, is 29.7 meters (97 ft) above sea-level. This height is meant to leave the deck out of reach of the worst possible waves in a situation of high tide + worst centennial Indian Ocean hurricane. The deck is closer to the surface of the ocean than the Golden Gate Bridge (whose deck is 67 m/220 ft above sea-level), but it is considerably higher than regular overseas viaduct such as the Overseas Highway through the Florida Keys. Price tag for this impressive viaduct: 980 million US dollars, i.e. 44% of the total cost of the Nouvelle Route du Littoral. For comparison, the famous Millau Viaduct in southern France cost "only" $670 million in 2013 US dollars.

Millau viaduct: cost $670 million to build:


Viaduct of the Nouvelle Route du Littoral: will cost $980 million to build:
[img]http://i39.************/2ppzu5k.jpg[/img]

The 6 lanes on the deck of the viaduct:
(There will unfortunately be no standard motorway hard shoulders on boths sides of the motorway. They were scrapped to diminish the cost of this already very expensive motorway. Instead, there will be a BDD, a sort of sub-standard shoulder that will only be about 1 meter wide, although the two bus lanes will be used as hard shoulders for some years before the bus line is put into service.)
[img]http://i54.************/2lj00hz.png[/img]

More pictures of the viaduct:









The rest of the Nouvelle Route du Littoral's 12.3 km will be 6.7 km (4.1 miles) of dikes and a smaller 220 m (720 ft) viaduct.

This map shows the viaducts in red and the dikes in blue:


The dikes will be built out into the ocean (with their oceanside plunging 11 meters below the surface of the ocean), but closer to the cliffs than the viaduct, along sections of the coast where the cliffs are smaller and less dangerous in terms of rock falls.



The top of the dike, where the motorway will run, will be 18.7 meters (61 feet) above sea-level. The width of the motorway on the dike will be 34 meters (112 feet), larger than on the deck of the viaduct.



Between the dikes and the cliffs, where the motorway currently runs, the terrain will be returned to nature and left as a zone to absorb rock falls.



At its southern end, the Nouvelle Route du Littoral will be joined with the spectacular Route des Tamarins motorway which was opened to traffic in 2009. It will thus be possible to drive uninterruptedly on a motorway all the way from the northern coast to the southern coast of Réunion.





On to the south!
[img]http://i41.************/656e1e.jpg[/img]

In total, 18 million cubic meters (23.5 million cubic yards) of rocks and materials will be needed to build the viaduct and especially the dikes. Construction is due to be completed by 2019, and the new motorway should open to traffic in late 2019 or early 2020.

In these videos you can see the future drive on the Nouvelle Route du Littoral, how motorists will experience it.

Here we start in St Denis and move southward along the viaduct and part of the dikes, before returning to St Denis:


Here the French construction and civil engineering company Vinci, which is in charge of building the main viaduct, explains the technicalities of the viaduct:
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Old December 30th, 2013, 07:06 PM   #2675
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An article talking about the Route du Littoral:

Quote:
Nouvelle Route du Littoral: Ceremony laying the foundation stone
Zinfos974.com
December 20, 2013


The prefect of Réunion, left. The president of the regional council, right.

The first accropode block was officially laid at La Possession, on Friday, December 20, under heavy rainfall.

[...]

During construction of the Nouvelle Route du Littoral, which will spread over several years, more than 20,000 accropode blocks will be used to build the dikes and the La Possession interchange.

At the ceremony were present several top officials, among them Jean-Luc Marx, prefect of Réunion, Alain Saint-Ange, Seychelles minister of tourism, Senator Michel Fontaine, the mayor of La Possession Roland Robert, and of course the president of Réunion's regional council, Didier Robert.

[...]

"I am very happy to be able to respect a promise that I made 3 years ago. It's December 20, and we're on schedule to start construction", said Didier Robert, after laying the first accropode block with the prefect of Réunion.

A construction work which he calls "colossal and most usefull in terms of security for all users of the road, and most useful for the Réunionese economy."

Bernard Siriex, chairman of Réunion's federation of construction businesses, described the day as "a great day for the construction industry. This project ensures that public works will pick up again and give us hope that construction activity will rise in Réunion." "Specialists from the entire world will come to visit the construction sites, because never has such a long and wide overseas structure been built to resist hurricane forces", he added.


[IMG]http://i44.************/25icabm.jpg[/IMG]

[IMG]http://i41.************/2eb7b80.jpg[/IMG]

http://www.zinfos974.com/Nouvelle-Ro...ee_a65854.html
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Old December 30th, 2013, 07:09 PM   #2676
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And another one:

Quote:
Nouvelle Route du Littoral: Didier Rober proud to start "the largest construction project ever launched on our island"
Zinfos974.com
December 20, 2013


[...]

According to Didier Robert, this is a road "distant enough from the cliffs so that we are definitely safe from any massive rock fall."

More than 2,000 Réunionese working on the construction

This 4-lane toll free road for motorists, with some added lanes for public transports, is "one of the most important infrastructure project launched nationwide, and the largest road project in Europe", underlined Didier Robert, adding that 2,000 Réunionese will work on the construction.

[...]

"We'll do it without scaling back anything"

The cost of the project, estimated at 1.662 billion euros and depicted as "astronomic" by some, is also under control according to Didier Robert. "Not only are we going to sustain this project, but we will do so without scaling back other commitments that we've made", assured he, mentioning the modernization of the Rolland Garros and Pierrefonds airports, the financial help to the tourism industry, renewable energies, sugarcane, ...

Conscious that this project will never gather unanimous support, Didier Robert said he wished to "let the detractors opposed to this project, as they are to many other projects, by principle, enjoy their full freedom of speech. As for me, I'm on the side of those who choose to move from words to action", concluded he.

http://www.zinfos974.com/NRL-Didier-...le_a65857.html
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Old December 30th, 2013, 11:59 PM   #2677
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Quote:
Originally Posted by Sesto Elemento View Post
Bris has posted this on SSP:
Where? The after "Originally Posted by New Brisavoine" leads to the Polish forum.
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Old December 31st, 2013, 03:39 PM   #2678
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Quote:
Originally Posted by Coccodrillo View Post
Where? The after "Originally Posted by New Brisavoine" leads to the Polish forum.
http://forum.skyscraperpage.com/show...19#post6387719
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Old December 31st, 2013, 07:42 PM   #2679
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What's that, a SSC clone? And why Brisavoine disappeared from here?
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Old December 31st, 2013, 07:55 PM   #2680
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I know he got banned a couple of times. I haven't seen him for a while. I think he's alright...
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