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Transporting drilling rig over the existing railroad steel bridge 1

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maranep

maranep

Geotechnical
Aug 22, 2019
3
I am doing an evaluation of the existing rail steel bridge for drilling rig movement. Because it is required to cross the bridge and do some secant drilling for the shoring wall. The client provides tight spacing/urban environment and no other access to transport the rig. It is a 1968 old steel bridge and grider is designed for e80 loading. I am planning to use an 8-axle truck with a trailer to transport the rig. From the old drawing, I got the max. moment(grider) for the LL, 3500 kipsft(4745 kNm), based on the truck axle load and configuration, Max. bending moment is calculated for the bridge span (8m). it is about 750 kNM. looks like it is safe to use the bridge for transport. Am I missing something to check? Thanks.
 
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Can you send it by rail?

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik
 
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shouldn't you be asking the owner of the bridge, ie, the railroad? presumably they have an engineering staff.
 
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Typically, rail bridges have the girders directly under the rails, but not much in the way of a deck to support very much load anywhere else. Have you checked the shear and moment capacity of the transverse members for the wheel loads?
 
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maranep said:
1)It is a 1968 old steel bridge and girder is designed for e80 loading.

2) Am I missing something to check?
Click to expand...

1) Would have been designed using "old" ASD (Allowable Stress Design); fairly generous safety factor.

2) Yes. Get a recent, thorough field inspection report, by a qualified inspector, to verify that the bridge remains rated for E80 loading. If a report is not available, have an inspection made.

 
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maranep, can you ask the railroad what are the typical or heaviest rail loads and axel spacings that currently use or recently used the bridge? Might be E80 load, but probably not. If you can get the loads, model those moving loads on the bridge and compare the stresses to those from your drill rig/truck analysis.
BridgeSmith made good comments. Bending of the main girders may not be the weak link.

 
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