CROSS Safety Report
Differing reinforcement couplers
This report is over 2 years old
Overview
On a recent project, because of supply problems, the contractor decided to change from the specified rebar couplers (type ‘A’) to those of another manufacturer (type ‘B’).
Key Learning Outcomes
For construction professionals:
-
Any proposed changes to the specified connection detail should be approved by the design engineer
Full Report
Find out more about the Full Report
The Full Report below has been submitted to CROSS and describes the reporter’s experience. The text has been edited for clarity and to ensure anonymity and confidentiality by removing any identifiable details. If you would like to know more about our secure reporting process or submit a report yourself, please visit the reporting to CROSS-UK page.
On a recent project, because of supply problems, the contractor decided to change from the specified rebar couplers (type ‘A’) to those of another manufacturer (type ‘B’). This was done without informing the consulting engineer. Although they look similar unless closely inspected, the two types have different tapered threads and thread pitches.
The threaded bars of type ‘B’ will not go into the couplers of type ‘A’ because they are slightly larger; however the threaded bars of type ‘A’ will go into the couplers of type ‘B’. The problem is that because the threads and taper are different the threaded bars of type ‘A’ do not engage properly with the type ‘B’ couplers and render the coupler joint ineffective.
The problem was discovered because the concrete cracked at the affected connection. The reporter concludes that it is important to ensure that couplers are not replaced with different makes on the same project.
Submit a report
Your report will make a difference. It will help to create positive change and improve safety.
Our secure and confidential safety reporting system gives professionals the opportunity to share their experiences to help others.
Feedback
No feedback has yet been published for this page.
Expert Panel Comments
Expert Panels comment on the reports we receive. They use their experience to help you understand what can be learned from the reports. If you would like to know more, please visit the CROSS-UK Expert Panels page.
Another confirmation of the need for alert site engineers. Also, confirmation that any propriety product must be used exactly as given in the manufacturer’s instructions.