×
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

Reasonable Ratio of coring/bolting in RCC cutting through the rebar.
2

Reasonable Ratio of coring/bolting in RCC cutting through the rebar.

Reasonable Ratio of coring/bolting in RCC cutting through the rebar.

(OP)
Hello guys,

I have a query that

Question:
What civil engineering code says about the reasonable number or ratio of coring/bolting around an openings in a manner that it cut through the rebar?

Picture below shows a case with damper secured to wall with bolts cut through the steel as marked in red. Opening is 4.2m wide by 2.25m high. In this case, lintel and walls at both side got hooked with broken steel.

Background:
I am part of a Mechanical Contractor working on Tunnel Ventilation. We have to drill holes in order to bolt the ducts around concrete openings. The duct size varies from 3m x 3m to 6m x 6m. During drilling, we encounter steel reinforcement and we have to core to cut through the steel. Due to large openings, the steel quantity is quite high and we have to core through the steel to bolt the ducts.


RE: Reasonable Ratio of coring/bolting in RCC cutting through the rebar.

A structural engineer for your project should be giving you guidance for this, not we random people on the internet. There are good reasons for that reinforcement being there, but there are no rules of thumb as to how much can be sacrificed.

RE: Reasonable Ratio of coring/bolting in RCC cutting through the rebar.

Agree wtih that.

And per your original question about "what the code says" - it essentially says that the structural engineer should review it to determine how it affects the structural system.

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

RE: Reasonable Ratio of coring/bolting in RCC cutting through the rebar.

I agree too.

You may be required by the SE of record to map the reinforcing pattern using X-ray scanning or similar to locate the rebar.

The SE should then tell you exactly where he will allow the penetrations you need.

The choice of penetration location is not just up to you.

Recently, I had to document where duct penetrations were allowed in a nine story concrete frame building where horizontal penetrations were needed through an existing concrete shear wall that was also functioning as a vertical load transfer element. There was a lot of critical steel in that wall that could not be cut. All the steel in the area of the cut haqd to be located and the critical steel missed.


Mike McCann, PE, SE (WA)


RE: Reasonable Ratio of coring/bolting in RCC cutting through the rebar.

Wun 'n dun I guess, huh?

Mike McCann, PE, SE (WA)


RE: Reasonable Ratio of coring/bolting in RCC cutting through the rebar.

As noted by others, the Codes don't cover this. Actually, I believe your Contract should address this. If it doesn't, I see a claim, for or against you. Did you notify owner?

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

Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now
eBook - Managing the Context of Product Complexity Using the Digital Twin
Keeping track of changes to complex products is difficult—think Aerospace & Defense equipment, new generations of commercial aircraft, and software-based automobiles. A new way to managing the digital context of the physical product is required and the answer is the Digital Twin. This ebook explores the opportunity available for Operations and Maintenance for the Digital Twin. Download Now
White Paper - Trends in Industrial Filtration
Substantial progress has been made in filtration technologies in recent years. New filter media materials, designs and processes have led to filters that are more efficient, reliable, compact and longer lasting. This white paper will discuss the various trends that are impacting operational responsibilities of MROs today and the resources that are available for staying up-to-date on the latest filtration solutions. 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