×
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

Restoration of existing opens in waste water concrete tank

Restoration of existing opens in waste water concrete tank

Restoration of existing opens in waste water concrete tank

(OP)
Hi every body,

I am reviewing a design of reinforced concrete section to close seven circular opens ( one foot diameter each and one foot apart (edge to edge) . the seven opens are located at the corner of dividing wall between a 22'x 60'tank and 18' x 60'tank with 15' hieght and the seven open are located one foot high from the bottom slab.

The design proposed two 12" section walls (one on each side) 15' long and 5' high with one layer of rebar (#6 @ 12" vertically embedded 8" to the bottom slab & # 4@12" Horizontally) matching the original reinforcement of the wall to replace rebars that has been cut during the coring of the seven opens.

I am not sure if having 3 feet section of concrete (12" new wall section + 12" of existing wall) 15 long X 5 feet high (height of original wall dowels) is really required
to close the seven holes.

I think that design is ignoring the structural value of 5' high of the existing wall because the dowels through the seven holes were cut.     I feel that solution is over-designed.
 Is anyone has better idea of closing the holes and keep the wall structurally sound to handle the liquid pressure if one tank is fool and the other side is empty.  At the same time I am trying to reduce the cost ($ 21,000).

                              Thank You for your kind help
 

RE: Restoration of existing opens in waste water concrete tank

If the wall can support the condition (one side full, one side empty) with the 7 holes closed (assuming there is shut-off mechanism of some kind), then you can simoly plug the holes with some details to hold the plugs to resist push-out by hydrostatic pressure, but not for carrying flexural stress (the original wall will).

If the existing 7 holes were designed to be open all the time, means the wall wasn't design for full unbalanced load, then the 5' addition maybe is justified.

RE: Restoration of existing opens in waste water concrete tank

(OP)
The wall originally designed to support the full unbalanced load but the seven holes have been cored later to use both tanks at the same time without shut-off mechanism.

Thanks

RE: Restoration of existing opens in waste water concrete tank

So the wall strength has been compromised, then the 5' additions could be the simplest solution without further damage the existing wall by chipping/drilling.

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