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Posts Tagged ‘trenchless technology’

When wastewater repairs started in our small street we were told that our end was to be done using “trenchless technology”, but this has proved impossible.  Early yesterday morning a workman came to the door and warned us to close our windows because they were about to start excavating and there would be lots of dust.

Excavating the trench

Starting on the trench

I asked why a trench now needed to be dug and was told that while they’d hoped to do it “trenchlessly” they’d found that the underground pipe, which should be straight, had been pushed into wavy curves by the earthquakes.   Consequently a trench is needed and the pipe will have to be replaced.  This kind of plan change must happen all the time.  No wonder repairs take longer than expected.

“They thought this job was not so big
but now they know they have to dig.”

 

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This month they’re repairing the wastewater main right outside the cottage.  Part of Nova Place is expected to be closed for about three weeks.  Our section will be done using trenchless technology (i.e. pipelines), but further down the street the wastewater pipe will be replaced through open trenching.  We’ve been warned to expect increased noise, dust, and vibration, and we’re not allowed to use our usual parking space.

They started by cutting a section of our footpath

They started by cutting a section of our footpath

They lifted up the slice of footpath

Then they lifted up the slice of footpath

A big sucker truck was used to remove the earth

A big sucker truck was used to remove the earth

They sprayed water in the hole to make a sludge, then they sucked all the earth out.  This way they can see where all the pipes and cables are.  They don’t use shovels to dig things out any more because lines may have moved in the earthquake and there’s a danger that a shovel might cut something vital.   We’ve been assured “There will be no expected interruptions to your existing water, wastewater, power, or telecommunication services while we undertake this work.”  Does this mean there may be unexpected interruptions?  I just hope they get it finished before Xmas.

“My feelings re all this are mixed.
I’ll just be glad to have it fixed.”

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