Method of erecting a 80m long and 8.2m tall steel truss??
Method of erecting a 80m long and 8.2m tall steel truss??
(OP)
I am doing a steel railway bridge which carries 2 heavy rail tracks and spans over 3 tracks at 7.5m below the bottom of the bridge (in the midspan region). For a span / depth ratio of 10, the steel truss might be 8m deep.
Could any bridge guys propose some practical solution of erecting this structure?
(e.g. Cut the bridge into several pieces and get spliced on site and slide into position by launching…….).
There is a restriction: No permanent columns can be constructed around the 3 tracks.
Could any bridge guys propose some practical solution of erecting this structure?
(e.g. Cut the bridge into several pieces and get spliced on site and slide into position by launching…….).
There is a restriction: No permanent columns can be constructed around the 3 tracks.





RE: Method of erecting a 80m long and 8.2m tall steel truss??
In this manner the bridge is built without impeding rail traffic and the bridge can be set or moved inbetween train schedules.
This is quite common here in the US, especially in the midwest.
Regards,

Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: Method of erecting a 80m long and 8.2m tall steel truss??
RE: Method of erecting a 80m long and 8.2m tall steel truss??
The general contractor was Allan A. Myers of Worcester, PA. The steel erector was Cornell & Company from Woodbury, NJ. I think the engineer may have been Gannett Fleming in Audubon, PA.
RE: Method of erecting a 80m long and 8.2m tall steel truss??
No launching in my case, just rolling.
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Try the link above and cursor down to the photo where the two bridge are side by side. Picture the old bridge sliding to the right out of the picture and the new bridge sliding right onto the old bridge's supports.
Regards,

Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: Method of erecting a 80m long and 8.2m tall steel truss??
If the above situation is correct is it possible to erect a falsework to support the new structure during construction. From a space point of view I would expect this would be possible, but perhaps there are regulations which do not permit this.
Launching is the other option. The only disadvantage is that for an 80m span you need a large launching nose which may cost as much as a falswork from below.