I have a clay 4" side sewer that is 100ft long but is 20 feet deep as it nears the city sewer. The sewer is 60 years old and in very good shape no bellies very few roots, but at 88ft out it has a break in the bottom of the pipe creating a very jagged triangle pointing up in the middle of the bottom of the pipe. I have been asked to do a patch on this spot so my thinking is to get a chain knocker and using the camera try to beat or grind it down to apply a patch. I was not the camera person on the job or I would have jabbed at it to see if it moves so I must approach this from the standpoint that it is solid and wedged in place. If the chain knocker broke the pipe on the side or top it would be ok as it will be getting patched. Any body try this with a chain Knocker before?
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