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Repair to cracked drain/sewer pipe

Earlier today we had a problem with a blocked sewer pipe and we called someone out to clear the blockage which he did without too much trouble though while in the process around 10ft from the manhole some liquid (lets just call it that) was pushed up through the block paving (between two bricks) which he said meant there was a cracked pipe possibly where there is a joint though this section of pipe was replaced in 1974 when the bathroom in the property was moved. In any event he wants to dig up the area removing the block paving in order to repair the pipe. Having done some reading online I have seen some companies advertising services where repairs are possible without digging the area up and they would normally put a camera down to check the damage first which he did not do.
I am having reservations about whether to go along with his proposal, is it normal to simply move to digging the area up when it would appear that putting a camera down to check out any damage should be relatively easy bearing in mind the location from the manhole?

There are no trees nearby this is a path beside the neighbours drive between two houses and there has been no other obvious disturbance to that area (i.e. no other digging work or repairs to any other pipes etc) this area has not been disturbed since the block paving was put down several years ago.

Any help and advice would be gratefully received.

4 Answers from MyBuilder Plumbers

Best Answer

have the camera put down first to check the drain,ie is just a joint leaking a cracked pipe tree roots or the drain has collapsed ,you will then be able to see if it needs to be dug or the drain can be lined without digging.


Answered 6th Mar 2018

In my opinion. If liquid sediments were rising up through the paving whilst rodding, or power flushing unblocking techniques were in progress. It would normally suggest that there is a fault in the pipe run. This could be either a collapsed section of pipe, or a fault at one of the collar joints within that specific pipe run.
I would definitely say that there is a fault somewhere on the pipe run.
As I do not know what method was used to unblock the drain, it is difficult to say how severe the problem may be.
Rodding manholes shouldn't normally cause liquid sediment to rise above the surface as the pig end of the rod should only push sediment further down the run of the pipe. If a severe blockage is located, the rods would no longer continue to brake up or push the blockage through, preventing this method in clearing the pipe run.
At this stage, I would then suggest a camera survey of the blockage within the pipe. This would then provide the customer with an indication of the blockage or problem. The correct solution and location to the problem can then be addressed.

If power flushing was used before a camera survey has been completed. There is the possibility that any fault within the pipe (blockage, fracture or collapse) will only add to the pressure already in place. The increased pressure will eventually find its own way out of the blockage, as it has no where else to go. If there was a previous fault or fracture with the pipe run, this technique could also increase the damage at that point of the pipe run. Especially if it is a clay pipe.

My recommendation, if not already been done, is to have a camera survey on the pipe run first to assess where the problem lies and what the problem might be.

I believe that excavation and exposure of the pipe run will be inevitable, with repair work to the fault to be completed to resolve the problem.

Another point to think of, after finding where the fault lies. Is where on the run the responsibility lies. The problem may not be within the boundaries of you're property. It may turn out to be a council issue or possibly an issue for one of you're neighbours to resolve.

Kind regards,
A. Drum


Answered 6th Mar 2018

As you mentioned that liquid is rising upwards there is no doubt this is not normal and there is clearly a fault with the drains.
The contractor who has suggested digging up the area will not of advised cameras clearly as he will not have them or the tools or means of repairing the pipe via internal lining where as companies like Dino Rod will however there cost will most definitely be more expensive than your contractor.
I think the decision you must make is that if your contractor is to lift the block paving and fix the problem will he be able to guarantee the block paving is reset as well as before it was lifted and experience tells me this wont be the case so I think I would be tempted to bite the bullet and get the bigger companies in who can cover your patio or paving under there insurances.


Answered 6th Mar 2018

O dear. Advice of not to dismiss water pipe damage. .
Can cause a sinkhole I have seen what this can cause. Manholes. Gulls that have not been pointed to brick work
Sinkhole is result.
Excavate area. Findings of broken pipe. Cut repair with same size in diameter.
Two plastic collars.
Look in side collars there is a middle of pipe seem.
Break seam with small chisel
To make inside smooth.
Slide each collar over pipe .
Place new piece pipe to repair slid collars over joint to close repair.
There is a joint compound to use.
If left one could look at a sink hole 20 to 30 fthe deep...
Sorry to bare bad news.
For water to pass through wearing course that's evidence of damage.
Solution = investigate. .


Answered 6th Mar 2018

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