INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Culvert river crossing

Culvert river crossing

(OP)
We are designing a large sewage collection culvert system where the culvert size is a twin 3m high by 3m deep.

Please can anyone advise if there are any standard designs available. I am concerned not just with the physical size and installation aspects of the projects, but also the tendency for the sewage to collect at the low point.

Regards

RE: Culvert river crossing

2 no of 3m wide x 3m high culverts beneath a river. Sounds challenging.

What are the soils? Alluvial soft souls o guess.

How wide is the river? How deep beneath the river bed do you need to be?

I've heard about Culvert jacking as an option. I've never used it or seen it being used but from what I've seen online you would have cutting blade on the front of your box section. Dig a pit and then lower the culverts in a jack them off the back wall of the pit. 3x3m would be tight to get a small excactor in to remove the soil. I'd say there are people here that know Moore about it than I do, so please correct me if I am wrong
 


Re the low point, i presume it's a gravity system? I would ensure that there is no low point beneath the river portion. With a rising main you can have low points depending on the topography. These low points require flushing wells for maintence to clear out the solids that sit in the low point. I imagine it would he te same fi you have a low point in your culvert.

RE: Culvert river crossing

river crossings for sewage are generally either siphoned or force mains. you really cant do it with a concrete box section as they do not make a precast box with a joint/gasket that can handle water pressure. on the other hand, there are plenty of round pipe options that can handle both jacking forces and water pressure. suggest you switch to a round pipe or series of pipes. unless this is a dry riverbed, you will need to jack and bore / microtunnel under the river, below the potential scour depth. or potentially directional drill. call a pipe jacking contractor for some help with the installation.

RE: Culvert river crossing

(OP)
Thank you for the replies will consider all these comments to progress the design.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close