When a road is built over/under a railway line

[sheff'd victoria]

Here is a link to a picture of the M67 going under the Woodhead Line near Newton For Hyde station , the M67 was build in 1978, my questions are, how did they manage to keep the railway running when the road was under constuction and is there any other examples people can think off ?


http://maps.google.co.uk/maps?hl=en...noid=ZY-up5K3zI7qPzH7UgbCZw&cbp=12,54.65,,0,5

 

[CarterUSM]

The M74 extension is currently being constructed from the centre of Glasgow to the south east of the city, this has, amongst many other things, involved placing huge steel beams over the railway at eglinton st junction and also over the Ayr line too. Many notices have been issued with regards to this from a distraction point of view, i.e. do not watch them working when you should be watching the line ahead. It has resulted in little or no disruption to the railway whatsoever, though I think much work is done at night also. On a slightly related note, some high rise flats were recently demolished next to the queen st-falkirk-edinburgh line at around the cowlairs area, they were blown up at around 2 or 3 in the morning to minimise disruption to the railway!

 

[jopsuk]

There's recently been two new bridges built crossing the line south of Cambridge. The bridge beams and decks were installed during weekend closures.

 

[Old Timer]

Practice is to construct the new underbridge alongside the track in advance.

The track is removed and the underpass is excavated, and the bridge is slid into position.

 

[j0hn0]

I think that the (useless) contractors hired to build the Rugby relief road should be asked this question.

The bridge over the trent valley line is the one I am talking about

 

[royaloak]

Practice is to construct the new underbridge alongside the track in advance.

The track is removed and the underpass is excavated, and the bridge is slid into position.

Am I right that on a few occasions a temporary bridge has been built beside the old one, the track slewed over, a new bridge built on the site of the old one and the track put onto the new bridge on the old alignment.

Now I am sure I have seen this somewhere (ECML?) but cant remember where.

 

[moonrakerz]

When the A350 bypass round Chippenham was built a few years ago, the road had to pass under the main line to Bristol, which is on a high embankment.

The new (under)bridge was built in the field alongside the track. As soon as the last train had passed on Christmas Eve, the track was lifted, a huge section of the embankment was cut away and the new bridge slid into place.
The line was out of use for 72 hours, 48 of which were train free anyway.

Very impressive to see how it was done.

 

[Geezertronic]

Isn't this what they did at Tipton recently? They removed a level crossing and "moved" the road to run underneath the railway line?

http://www.tiptonboxjack.co.uk/timelapse.html

 

[starrymarkb]

I know they replaced the A38 sliproads into plymouth by building the new ones on temp supports, demolishing the old, building the permanent supports, then moving each sliproad into the final position over a weekend. Each sliproad was about 400m...

 

[Ploughman]

Am I right that on a few occasions a temporary bridge has been built beside the old one, the track slewed over, a new bridge built on the site of the old one and the track put onto the new bridge on the old alignment.

Now I am sure I have seen this somewhere (ECML?) but cant remember where.

Bingley bypass is an example of this.
A temporary alignment was built then track slewed over / relaid on to it.
Old alignment removed, new bridge built and then track relayed and temp track removed.

 

[ailsa]

Am I right that on a few occasions a temporary bridge has been built beside the old one, the track slewed over, a new bridge built on the site of the old one and the track put onto the new bridge on the old alignment.

Now I am sure I have seen this somewhere (ECML?) but cant remember where.

This was done on the Chiltern line near Bicester when the ring road was built. Steel piles were driven into the embankment and the ground alongside. The space between them filled in, and the track moved to one side. Then the new concrete bridge was poured and left to set. After this the track was moved back across onto the new bridge, and the remaining embankment demolished. IIRC the longest closure was a weekend.

 

[royaloak]

Am I right that on a few occasions a temporary bridge has been built beside the old one, the track slewed over, a new bridge built on the site of the old one and the track put onto the new bridge on the old alignment.

Blimey I didnt realise it was used that much thanks chaps.

 

[MrC]

Another example is St Cross Tunnel between Winchester and Shawford which is having to be replaced due to gauge enhancement along the route. First a complete new footbridge was built to take pedestrians and service cables etc which the old tunnel used to carry. Now a new bridge deck is being built over the top of the old tunnel to carry the road and, when this is complete, the new bridge will be reopened to road traffic while the old tunnel is dismantled around it. When all is complete the new footbridge will be removed.

For info see http://www3.hants.gov.uk/roads/hampshire-roadworks/winchester-stcross-roadworks-2010.htm and some good pics at http://www.flickr.com/photos/foilman/4464040185/