×
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

Clear distance between Pile & Caison foundation

Clear distance between Pile & Caison foundation

Clear distance between Pile & Caison foundation

(OP)
I am designing a pile group to support a bridge pier. Just adjoining to the proposed pile location, there is an existing caisson/well foundation. I am searching if there are any guidelines for minumum clear distance required between this pile group and the caison/well foundation. Please post if you know any guidelines / reference.

Pile group consists of 4 piles - bored cast-in-situ piles (in square pattern, each of 1.2m dia). Caisson/well foundation's diameter is 3m.

Thanks in advance

RE: Clear distance between Pile & Caison foundation

From a construction point of view, you have several points to consider :

- possibility of a concrete overbreak in the top meters of the 3 m diameter existing caisson, which might make it difficult to contruct the new piles ( deviation )
- you don't want the ground between the existing caisson and the new pile under construction to collapse in the new pile hole before it's concreted. Murphy's law applies to these soils : when you don't want them to collapse, they do and if you want them to collapse, they don't. If you need to stay close ( less than 1 m ) then think about protecting the new pile excavation with a temporary casing.

From a design point of view it would be better to go deeper than the existing caisson ( provided you know their depth ! )

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