17 June 2011

Queanbeyan road closures

| johnboy
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Queanbeyan City Council will be repairing a collapsed sewer main at the intersection of Morisset and Collett Sts from Monday 20 June until Friday 26 June.

As the sewer main runs under the eastbound side of Morisset St there will be disruptions to traffic in the area.

• Morisset St will be closed to through traffic in an eastbound direction (heading towards the low-level bridge) between Crawford St and Carinya St. Access to the Woolworths and City Link Plaza carparks will not be affected.
• Collett St, between Morisset and Antill St, will be closed to traffic in both directions. Local access to carparks will not be affected.
• Drivers approaching the Collett St roundabout from the south (Queens Bridge direction) will only be able to turn left.

Variable messages signs will be placed around the affected area and detour signs will be visible for drivers.

“About two metres of the sewer main was damaged during the December 2010 floods and since then Council’s Water and Sewer team has been investigating the problem,” Council’s General Manager, Mr Gary Chapman said.

“Due to significant damage caused the only option was to replace the affected part of the sewer main. The sewer main, which was installed in the 1940s, is 300mm in diameter and is located eight metres under Morisset St.

“Once the collapsed section has replaced the sewer main will be relined, extending the life of the main for another 50 years.

“There will be some traffic disruptions around the affected area during the week and residents are urged to avoid the area if possible. Council conducted a letter drop to surrounding businesses and residents alerting them to the disturbance.”

[Courtesy Queanbeyan City Council]

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The Frots said :

Eight metres………………………damn, that’s deep! That can’t be right surely…………………..

With sewer it’s all about maintaining grade. Gotta have fall on that pipe, because as any decent plumber will tell you, shit don’t like to flow uphill. You can assist it with a handily placed pump station, but I’m guessing they would be few and far between in the 1940’s. Deapest sewer I know of in canberra is at least 12 metres from current surface to invert of pipe. It’s a much bigger pipe though. Consider that when you excavate below a couple of metres you have to bench (step or batter) the excavation, and Imagine buying a block of land over that easement. :p (I kid I kid, as if anyone would allow such a thing! Right????)

The other consideration is that in the 1940’s the surface level in that location may not have been as high as it is now. Developers do like to cut and fill to give themselves a nice level playing field/shopping precinct.

Given that it’s lasted close to 70 years, that’s pretty impressive for a little old ceramic pipe! Gives me hope for the 6″ VCP running out from under my house. 🙂 For some perspective, modern ductile iron pipe systems are supposed to be good for 100+ years lifespan. Ahhh sewer. Fascinating subject.

Eight metres………………………damn, that’s deep! That can’t be right surely…………………..

“The sewer main, which was installed in the 1940s, is 300mm in diameter and is located eight metres under Morisset St.”

Damn! That’s deep. I had no idea they stuck pipes that far underground. Also 300mm strikes me as being rather narrow for a sewer main. Household wastewater pipes are about 100mm in diameter.

There were actually a bunch of guys with pumping trucks and hoses blocking off part of the Collett St./Morisset St. intersection this afternoon.

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