• Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!

Raising Brick and Masonry Railway Bridges for increased clearances

Status
Not open for further replies.

2192

Member
Joined
16 Aug 2020
Messages
372
Location
Derby UK

Bridge lift to increase clearances​


28 October 2016

tn_gb-elevarch-overview-freyssinet.jpg


The Railway Gazette published this item in 2016 "Bridge lift to increase clearances. UK: An innovative process to raise arched masonry bridges to increase clearances for electrification was successfully demonstrated in Buckinghamshire on October 26." This was also reported in Modern Railways. It involved jacking up both sides of the bridge simultaneously using computers to give millimetre accuracy of lift so as not to disturb the mortar. Did the firm get any contracts following the demo? (I can't read their name on the banner over the arch.)
 
Sponsor Post - registered members do not see these adverts; click here to register, or click here to log in
R

RailUK Forums

yorksrob

Veteran Member
Joined
6 Aug 2009
Messages
39,236
Location
Yorks
It's a shame it hasn't received more interest really. It seemed quite a quick process.
 

hwl

Established Member
Joined
5 Feb 2012
Messages
7,433
If memory serves it also is only suitable for a sub-set of better constructed arch bridges (probably all with Portland cement too).
 

InOban

Established Member
Joined
12 Mar 2017
Messages
4,227
And bridges which don't carry services (water, power, telephone etc )That's most of the reason it takes so long to carry out the work.
 

yorksrob

Veteran Member
Joined
6 Aug 2009
Messages
39,236
Location
Yorks
If memory serves it also is only suitable for a sub-set of better constructed arch bridges (probably all with Portland cement too).

That could be quite problematic. I'm guessing a lot of bridges built during the main construction phase of the railways will have used mortar.
 

swt_passenger

Veteran Member
Joined
7 Apr 2010
Messages
31,543
If memory serves it also is only suitable for a sub-set of better constructed arch bridges (probably all with Portland cement too).
I think on the demonstration they basically rebuilt the entire infill in reinforced concrete before starting anyway. I suspect this demonstration shows there is a last resort solution if some particularly obstructive local authority insists an old bridge cannot be altered, but we‘re unlikely to see it normally.
 

EbbwJunction1

Established Member
Joined
25 Mar 2010
Messages
1,568
Something tells me that one of the bridges between Newport and Cardiff (or Severn Tunnel Junction and Newport) was raised rather than replaced during the electrification works, but I can't remember any details (or even if I'm right!).
 

edwin_m

Veteran Member
Joined
21 Apr 2013
Messages
25,025
Location
Nottingham
Something tells me that one of the bridges between Newport and Cardiff (or Severn Tunnel Junction and Newport) was raised rather than replaced during the electrification works, but I can't remember any details (or even if I'm right!).
It might have been a beam rather than an arch bridge. That would be easier to raise, as the beam is solid from end to end whereas with an arch there's a risk of masonry breaking up.
 

EbbwJunction1

Established Member
Joined
25 Mar 2010
Messages
1,568
It might have been a beam rather than an arch bridge. That would be easier to raise, as the beam is solid from end to end whereas with an arch there's a risk of masonry breaking up.
Ah, you could well be right, thanks; I did say that my memory was a little vague on it!
 

edwin_m

Veteran Member
Joined
21 Apr 2013
Messages
25,025
Location
Nottingham
If the extra height is needed for structure gauge enhancement rather than electrification then an arch could have to be raised quite a way to achieve the necessary clearance at the corners where containers are larger than traditional trains. Replacing it with a beam bridge might allow the road to stay at or near the same level, reducing the work needed to re-profile the approaches.
 
Status
Not open for further replies.

Top