Replacing 1m length of sewer pipe with suspected cement blockage

[Seanog]

Hi, I want to replace an approx. 1 meter section of underground sewer drain where I hope to locate a blockage of dried cement (from a new extension building project). MY question is what would the exact procedure be, if for example, the pipe is 15 cm in diameter. Would I just use a 1 meter length of new 15 cm dia. pipe, connected with Fernco connectors? I was wanting to avoid any "lips" at the joints which may slightly impede flow. Thank you.

 

[supper plumb]

is it new or old pipe run how hard is the dig clay plastic

 

[mountainman]

The exact procedure, imo, would be to get someone who knows what they are doing to sort it out and you recoup the cost from whoever blocked the pipe with cement.

 

[supper plumb]

if you can rod the drain to see how far the blockage is mark out on the ground where the pipe run is and get digging.
clear out say 1.5m of the pipe so you can get round it use two rubber slip collors and 1m pipe cut and clean adges of pipe then re rod the pipe from the hole to see if you missed any blockage lube up the pipe fix the pipe in place with slip collers 2/3 bags of gravel round the pipe back fill done

 

[kozak1968]

Have a cctv survey first to find out what the exact problem is.

 

[Seanog]

if you can rod the drain to see how far the blockage is mark out on the ground where the pipe run is and get digging.
clear out say 1.5m of the pipe so you can get round it use two rubber slip collors and 1m pipe cut and clean adges of pipe then re rod the pipe from the hole to see if you missed any blockage lube up the pipe fix the pipe in place with slip collers 2/3 bags of gravel round the pipe back fill done

When you say "slip collars", do you mean fernco flexible rubber couplings? Actually, I haven't started digging yet, and don't know exactly what material the drain pipe is made of. My question basically is would the flow be impeded a bit, over time, by the slight gaps at the ends of the inserted pipe. Please see drawing of my proposed solution. Thank you.

 

[supper plumb]

no if fitted right its a black rubber coller with two jewberlee clips to tighten up use a light file to clean the pipe some washing up liquid to lube the collers up are you 100% it needs digging out have you tried rodding it or calling out some one to look first

if it needs digging up after this then do it your self will save abit of cash this way where in the world are you

 

[Seanog]

Actually, this is a friend's house. A CCTV camera has already been down there, but seemingly with inconclusive results. Apparently the images were too unclear...Yea, the black rubber collar, I think is the same as a Fernco flexible connector. It has 2 stainless steel jubilee clips at both ends - a rugged rubber "sleeve". So you think if I file the ends of the pipes to, maybe 45 degree angle, it would improve the flow of waste water? Actually, it's a Victorian house in Dublin. Thanks.

 

[supper plumb]

you can only follow whats there if you cut out 1m pipe you can only put back a 1m pipe so it will sit in the same place the old one did

 

[Seanog]

you can only follow whats there if you cut out 1m pipe you can only put back a 1m pipe so it will sit in the same place the old one did

Yea, Got it. So, I assume I should make the new 1m of pipe as tight a fit as possible, and file the pipe edges a bit to improve water flow, right? Actually, what I'm thinking of doing, especially since I'm told there's no nearby manhole, is to open the pipe under the new extension, near to the back garden, then probe back "upstream" along the pipe to see if I can locate the blockage (at least then there's no chance of pushing the blockage towards the main sewer). In the case that the existing pipe is old clay type, I assume it would be ok to use another material, like pvc, to replace the pipe I cut out? As long as I use the appropriate flexible rubber collars with jubilee clips, I mean.