×
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

Concrete Removal and Repair

Concrete Removal and Repair

Concrete Removal and Repair

(OP)
So, I have a manhole opening on a 350mm slab. The manhole cover would supposedly bear on a 50mmx50mm recess on the 350mm slab. Now, the manhole cover apparently needs to sit on a 90mmx90mm recess so part of the slab surface needs to be hacked.
My question is, how do I repair the concrete slab so that it would still have adequate concrete cover and what about the reinforcement that would need to be cut (possibly affecting the supporting pit wall reinforcements)?

RE: Concrete Removal and Repair

The coffee hasn't quite kicked in yet but I see two options:

1. cut off the wall below the bracket and start over

2. Can you raise the grade slightly to avoid cutting the top part of the hairpin bar? This way you only need to cut out a small piece and concrete and you don't need to drill and grout horizontal bars. No matter, where you have bars at the surface, you'll need to chip out the concrete around the bars; go at least an inch deep; cut off the bars; and patch with epoxy mortar. Saw cutting vertically shouldn't be a problem but you probably won't be able to completely saw cut horizontally, so you'll have to chip out concrete. Sika has a product - the name escapes me at the moment - that can be applied 1/8" thick to smooth out surfaces. I saw it used on a wastewater treatment plant and it worked well.

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