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Dealing with redundant cast-in channels in close proximity to post-fixed anchors

Here, brick support specialist, Ancon, provides details of how redundant cast-in channels should be treated when located in close proximity to post-fixed anchors.

This information was compiled by the Ancon Technical Services Team, who are available to answer any Ancon product related enquiry. This guidance is based on using Ancon cast-in channels 38/17 or 30/20. Anchors that are greater than 100mm away from redundant cast-in channels can be designed in the normal way, treating the cast-in channels as the concrete edge.

Case 1

For applications where the redundant channel is at least 50mm above the new post-fixed anchor.

In such applications, the filling of cast-in channel locally is not required. A bolt with a 20mm greater embedment depth should be used, for example:

  • M12 FBNII 12/30 becomes FBNII 12/50
  • M12 FAZII 12/30 becomes FAZII 12/50

Case 2

For applications where the redundant channel is less than 50mm above the new post-fixed anchor.

Where post-fixed anchors are to be used in close proximity to cast-in channels, it is essential that the channel is filled locally in order to maintain the compressive resistance of the structure around the anchor.

Ancon recommends the use of Epoxy Putty, from Epoxy Products Ltd. Firstly, fill the cast-in channel locally (min. 100mm) using the Epoxy Putty and use a bolt with 20mm greater embedment, for example:

  • M12 FBNII 12/30 becomes FBNII 12/50
  • M12 FAZII 12/30 becomes FAZII 12/50

Case 3

For applications where the redundant cast-in channel is a minimum of 50mm below the new post-fixed anchor.

In such applications, fill the cast-in channel locally (min 100mm) using Epoxy Putty and use a bolt with 20mm greater embedment depth, for example:

  • M12 FBNII 12/30 becomes FBNII 12/50
  • M12 FAZII 12/30 becomes FAZII 12/50

Case 4

It is NOT RECOMMENDED to install a new post-fixed anchor in applications where the redundant cast-in channel is to be less than 50mm below the new post-fixed anchor. Please contact Ancon Technical Services with details of your brick support application.

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