×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

Pipe jacking size limitations

Pipe jacking size limitations

Pipe jacking size limitations

(OP)
We are researching ways to place RCPs through an existing road embankment where an 8-foot diameter conduit already exists.  Either two additional 10-foot ID conduits along side the 8-foot pipe or one 16-foot ID conduit are required to handle the flows.  Hard, basalt bedrock may be encountered along the alinement.  

Are there practical limitations on the maximum size of RCP that can be "jacked" through an embankment?  

RE: Pipe jacking size limitations

Limitations?  Yep.  Basalt.

Seriously, a 10 foot diameter pipe is within the limitations of the larger pipe jacking contractors.  But a 16 foot pipe diameter may not be - in your area.  Site and soil conditions have a lot to do with the success of this construction technique.  Have you checked with the local pipe jacking contractors?

If you think that you may encounter basalt - even the weathered variety - along the pipe alignment, you would probably be better off with hand mining the two smaller shafts.  Delays to the pipe jacking scheme could result in very costly extras - resulting in a much higher cost than hand mining.  Something to think about, anyway -



Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.  See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"

RE: Pipe jacking size limitations

I guess at 16 foot ID no pipe jacking cutting head would be provided and that a combination of jacking and hand mining would be used.

Zambo

RE: Pipe jacking size limitations

(OP)
I realize that the mixed face conditions may require hand mining; I am more interested if anyone has experience jacking 16-foot ID pipe into place after excavation at the face has occurred?  What is the maximum size that has been successfully jacked?  Will the conduit need to be cast in place after the opening is tunneled by traditional methods?

RE: Pipe jacking size limitations

you need to look at the costs of manufacturing, transporting and jacking this large pipe versus the cost to line the tunnel in place.  It may be cheaper to just install a tunnel liner

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