Concrete Collar:   
Description:  Installing a concrete collar involves building a form around the area to be repaired and encasing it in concrete.
    
Installation Instructions:   Cut out the damaged area, make cuts in the center of the corrugation valley.  Cut the replacement pipe section to the desired length.  Trim any polyethylene burrs from saw cut.  Excavate bedding from under the existing pipe cut ends.  Place gaskets in the pipe corrugation on each cut end.  Strut or brace the pipe as necessary.  Encase the damaged section of pipe with a concrete collar.  Carefully replace and compact bedding and backfill to provide proper support for pipe and coupler.
    
For cracks, joint defects and minor damage excavate bedding from under the existing pipe to a width 12" greater than the damaged portion.  Encase the damaged section of pipe with a concrete collar.  Carefully replace and compact bedding and backfill to provide proper support for pipe and coupler.
A concrete collar diagram.
    
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