About Trimmer bars and Diagonal bars?

Providing over the openings

*In the UK Trimmer Bars is the name for additional bars placed round an opening, such as pipe penetrations through an RC tank wall or a large opening. They are usually placed at 45 degrees across corners (assuming horz bars at 0 deg and vert bars at 90 deg).
*Trimmer bars shall be installed around the perimeter of all joint free slabs and along the edge of all pour breaks as detailed. Diagonal trimmer bars shall be installed at the corners of all penetrations and at all re-entrant corners. A minimum HD12 bars shall be installed around the perimeter.

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