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RE: Sewer Aerial Crossing

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I would suggest you contact the Ductile Iron Pipe Research Association @
http://www.dipra.com/

They have Regional Engineers will be able to provide you with some
valuable guidance.

hth
Pat Symons
Roseville, Ca

-----Original Message-----
From: Keith Fix [mailto:kefix(--nospam--at)yahoo.com]
Sent: Wednesday, August 28, 2002 1:22 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Sewer Aerial Crossing


I can't vouch for its applicability to your conditions, but Type 304
stainless
is the most readily available.  I recommend you use that if it suits
your
needs.

-Keith Fix, PE
-Little Rock, Arkansas

--- "Speck, Todd M" <tmspeck(--nospam--at)pbsj.com> wrote:
> Thanks for the responses; feel free to add should one wish.
>  
> A few other items to clarify.
>  
> It is a stream crossing.
>  
> The total length is 60' +/-.  Each individual span length will be 20',
equal
> to the lay length of the pipe.
>  
> The pipe is continuously supported by a concrete "beam" or cradle or
> straddle.  The cradle spans between abutments and bents.  The cradle
is a
> flat rectangle with a semicircle cut from the top to hold the pipe.
The
> pipe will be strapped to the cradle using stainless steel brackets at
each
> pipe segment end.  
>  
> I'd still like to hear what type of stainless steel one would
recommend.
>  
> Straight pipe with a slight vertical grade.
>  
> Any thoughts on the differential vertical movement due to soil heave?
>  
> Thanks, again.
>  
> Todd
>  
> 
> -----Original Message-----
> From: Speck, Todd M [mailto:tmspeck(--nospam--at)pbsj.com]
> Sent: Wednesday, August 28, 2002 8:16 AM
> To: SEAInt (E-mail)
> Subject: Sewer Aerial Crossing
> Importance: High
> 
> 
> 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
> abutment?
>  
> 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 concern.
>  
> Thank you in advance for your comments.
> 
> Todd M. Speck, P.E.
> 
> 


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