×
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

Minipiles versus pipe piles

Minipiles versus pipe piles

Minipiles versus pipe piles

(OP)
To support a structural foundation slab within a building with very limited headroom, specs call for minipiles (1-3/4" Dywidag rod in 5-1/2" hole); tolerance of max 2% to vertical. Soil is 18' dense fill, 20' very soft to soft clay, and medium to stiff clay down to hardpan at 90' depth. Contractor proposes change to concrete-filled segmental pipe piles (including 5-1/2" and 3-1/2" diameter). I am concerned about the proposed substitution. Any ideas?

RE: Minipiles versus pipe piles

I personally would not have a problem with the contractor's solution using the 5.5" piles - this is a pipe pile of similar tip diameter to long timber piles. You didn't say if open or closed tip - I'd use the latter. But at the depth of 90 ft, you'll need to check the mode of buckling.  The smaller size, well, it just seems too small!

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