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Rail trackbed design
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Posted by: JonSmith

03/13/2007, 15:29:37

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Can anyone point me to a good reference on trackbed design. I've got a heavy crane rail to replace under a track mounted dockside crane. Say 30t/bogey.

Why do modern rails have an elastomeric underlay pad? from what i see it allows small movement and that pumps rainwater. Don't want to use the pad but need to know reasoning for it's use.








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Re: Rail trackbed design
Re: Rail trackbed design -- JonSmith Post Reply Top of thread Forum
Posted by: randykimball
Barney
03/13/2007, 18:03:05

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Well someone out there is a professional at this. There are companies that contract out to the rail lines to replace rails. This is no information nor a surprise.

However, to me the logical reason for the elastomeric pad would to provide better pressure contact spread between the flat rail base and the less than perfect support system profile.
If on concrete ties, I would think to prevent the rails from eating up the rail seats, and the above reason.

Someone knows if I'm all wet.. and I'm sure they will let me know.....

Come on guys, this is a good problem to solve. If you are an engineer in this dicipline or know one, ring out.





The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.


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Re: Re: Rail trackbed design
Re: Re: Rail trackbed design -- randykimball Post Reply Top of thread Forum
Posted by: JonSmith

03/24/2007, 07:22:26

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Thanks for that. Take the point on rail flange eating up a concrete tie, if a dry joint. My track is under a heavy crane, so big local wheel loads. Think I will grout in the bed plate so well distributed bearing with close joint. will ignore the rubber pads as suspect they are a (new) 'old tradition'. That is, they get copied from job to job as they look good but no-one quite knows what they're for. I'm replacing a 50 year old track that has not got them and reckon 50 years is good enough!







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Re: Re: Rail trackbed design -- randykimball Post Reply Top of thread Forum
Posted by: k_rg

03/13/2007, 23:16:24

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The rubber pad, made normally out of Polychloroprene (Neoprene*)
serves the same purpose as the ones placed in between concrete road bridges (called "Bridge Pads" ) and the pillars - namely, to absorb compressive stress when the wheel passes over the gap from one rail to the next.
RG




R.Gopal


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