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Sewer Aerial Crossing
- To: "SEAInt (E-mail)" <seaint(--nospam--at)seaint.org>
- Subject: Sewer Aerial Crossing
- From: "Speck, Todd M" <tmspeck(--nospam--at)pbsj.com>
- Date: Wed, 28 Aug 2002 08:15:53 -0500
I'm designing a
sewer aerial crossing bridge. The bridge will only support the sewer
itself, no vehicular traffic. It's a 16" ductile iron pipe continuously
supported by a cast in place cradle/saddle spanning between single column
bents/abutments. The pipe/bridge at 100 yr occurrence will be completely
submerged. The overall span length is only 60'. I don't believe
expansion/contraction will be an issue.
1. I'd appreciate any words of wisdom with respect to general
design issues. I also have a few specific questions.
2. I'll be
specifying stainless steel brackets and bolts to connect pipe to the
cradle. What type of stainless steel should I specify?
3. The soil
has a potential vertical rise of 2.5". The abutment foundation will be
drilled shafts socketed into hard limestone and will not move. What is
done to assure the pipe can handle the differential movement at the
4. Sitting in
a cradle with a semi-circle cut out to hold the pipe I can envision water being
held in contact with the pipe indefinitely. Is corrosion of the pipe a
Thank you in advance
for your comments.
Todd M. Speck, P.E.