×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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.

Students Click Here

Jacking and Boring in Aggressive Soils

Jacking and Boring in Aggressive Soils

Jacking and Boring in Aggressive Soils

(OP)
I have a project that requires jacking & boring 400 feet of 48-inch pipe.  The pipe will be used as a storm drain, and no separate casing pipe is to be installed.  The pipe is to have 10 to 12 feet of cover and will operate under pressure flow.  There is a concern with the use of steel pipe because the soils are aggressive (pH = 4.4, resistivity = 18,400, Chlorides = 33, and Sulfates = 16).  If the steel is coated to improve its resistance to corrosion, the coating could be damaged by welding the pipe or from friction as the pipe is pushed through the soil.  Any suggestions as to a suitable alternate to steel for a sleeveless jack & bore pipe?

Please keep in mind that a casing larger than 48" is undesirable due to surrounding properties and utilities.

Jim Lee, P.E.
City of Tallahassee
Stormwater Division

RE: Jacking and Boring in Aggressive Soils

you could jack reinforced concrete pipe, but this would reduce the capacity of the storm drain.  Why not protect it with cathodic protection?

RE: Jacking and Boring in Aggressive Soils

Kubota of Japan manufacture ductile iron jacking pipe with an integral exteranl concrete sleeve and internal cement mortar lining, but it may not be available in the US. A 1200mm nominal diameter has an external dia of 1362 and internal dia of about 1198mm.

RE: Jacking and Boring in Aggressive Soils

You could use a polymer concrete pipe. Hobas Pipe in Texas makes a good jacking pipe. It is used extensively in  Microtunneling applications.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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