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We have a project showing the following detail (77-1631-087_BridgeEnd.pdf), where it is a bridge deck overlay and they are upgrading the bridge ends from Type C (page 3 of BA-202) to a more updated Type B (page 2 of BA-202). New bridge ends are
On past projects where we are only replacing guardrail, we’ve allowed the bridge side of our BTS (BA-201) to sit at 30” or 31” to match the old transition height as reconstructing new bridge ends was beyond the scope of the project. However, since this project is updating the bridge ends, in which order are the alternatives from most preferable to least?
a) Stay at 32” to the top of the bridge end and install 32” BTS. This leaves only 2
b) Stay at 32” to the top of the bridge but lower the bolt hole pattern by 1” or 2” to
c) Taper the new bridge end from 32” existing up to 34” by the first bolt holes (three
d) Another option?
Thanks for your assistance on this and future applicable instances.
|Other Keywords||concrete end parapet|
|Date||May 8, 2015|
We had a similar discussion to this just last week at our annual Midwest States Pooled Fund meeting. At that time, multiple State DOTs had said they have transitioned the ends of the bridge parapet up a few inches to provide a few more inches of cover to the attachment bolts/hardware of the thrie beam transition. This is very similar to your Option C, and I recommend this method for use. You vertical height transition of 1/10 seems well within reasonable bounds to prevent snag and vehicle instability during reverse direction impacts.
|Date||May 8, 2015|
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