×
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

Nailing through CFA Wall

Nailing through CFA Wall

Nailing through CFA Wall

(OP)
I'm looking at an application for soil nailing in Long Island.  The fills are alternatively decribed as "fill" and glacial till.  Typical crap decriptions.  However, where the the fills are present they are described as med dense sands and gravels, so to retain I'd like to propose soil nailing.  However when we cut them they'll collapse.  So I'm thinking of installing a row of soldier CFA piles along the cut line (installed hit and miss to let the concrete go off) using a very weak mix to allow us to drill through the CFA wall and install the nail.

Am I missing somethng?

RE: Nailing through CFA Wall

MSEMan,

Why not just construct a permanent tieback wall using H-Piles placed in CFA piles? We're using this technique on a 19-foot excavation to be constructed later this summer. The trick is to fabricate the H-Piles prior to construction so that you can install the tiebacks and preserve the shear and moment capacity of the section.

Jeff

RE: Nailing through CFA Wall

Soil naiing is most appropriate where there is some soil cohesion, where the temporary excavation will stand vertically, and where you can drill open holes for the nails.  You do not have these conditions.  Soil nailing can be done without these conditions but it becomes more difficult and more expensive.  Your idea of using the soil nail wall and CFA piles is even more expensive.  You seem to be going out of your way to make an inappropriate application work.

How high will your wall need to be?  I agree with jdonville that a soldier beam wall, tiedback if needed, may be a better way to go.

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