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Cotter Dam expansion up to 14 metres, the trickier 65 to go.

By johnboy - 27 September 2011 24

ACTEW have posted more glorious video of their work to build the new Cotter Dam.

Intriguing that they’re building the intake tower with jump form construction which they claim is unique.

screenshot

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24 Responses to
Cotter Dam expansion up to 14 metres, the trickier 65 to go.
braddonboy 11:02 am 28 Sep 11

krats said :

The old dam wall will remain and be inundated during extended periods of average to above average rainfall.

http://en.wikipedia.org/wiki/Cotter_River

Thanks krats…so the new dam wall is only good if it rains a lot?

Deref 10:16 am 28 Sep 11

Congratulations to ACTEWAGL for posting these video reports. I don’t know whether anyone else does it, but it’s a brilliant way of keeping people informed.

No mention of the problems they’ve been having with scaffolding, though.

krats 9:46 am 28 Sep 11

The old dam wall will remain and be inundated during extended periods of average to above average rainfall.

http://en.wikipedia.org/wiki/Cotter_River

johnboy 8:44 am 28 Sep 11

The vid appears to be back now.

braddonboy 8:07 am 28 Sep 11

I’m sure this question has been answered somewhere, but what happens to the old dam wall?

chewy14 5:14 pm 27 Sep 11

Deref said :

YetAnotherBlowIn said :

The embedded video is currently reporting “This video is private” when I try to play it and I can’t find the video up on the ACTEW YouTube channel. Has it been taken down for some reason? (Or am I just special?)

Same here. Very odd.

Obviously they can’t let you see the part of construction where they bury Megatron in the bottom gallery of the dam. Oops.

Deref 3:41 pm 27 Sep 11

YetAnotherBlowIn said :

The embedded video is currently reporting “This video is private” when I try to play it and I can’t find the video up on the ACTEW YouTube channel. Has it been taken down for some reason? (Or am I just special?)

Same here. Very odd.

johnboy 2:31 pm 27 Sep 11

how curious…

YetAnotherBlowIn 2:27 pm 27 Sep 11

The embedded video is currently reporting “This video is private” when I try to play it and I can’t find the video up on the ACTEW YouTube channel. Has it been taken down for some reason? (Or am I just special?)

rohbo 1:07 pm 27 Sep 11

Spectra said :

Intriguing that they’re building the intake tower by jacking up the base and shoving the next tier in at the bottom.

I’m not quite sure where you got that idea – it looks like (and was described as) a standard jump-form system. The formwork is in that white bit at the top, the concrete is poured into it (you can see the concrete pump arm on the left) and when that’s set the formwork is “jumped” up to the next level and the process repeated. It’s exactly the same system you’ll see used in building elevator shafts for most buildings.

Yeap looks like typical slip forming to me: http://en.wikipedia.org/wiki/Slip_forming

johnboy 12:59 pm 27 Sep 11

there we go guys.

davo101 12:56 pm 27 Sep 11

Well it is the only jump-form being used for dam construction, in the ACT, at the present. If you add enough qualifiers to anything it becomes unique.

Spectra 12:55 pm 27 Sep 11

johnboy said :

well they’re the ones claiming it’s unique!

It might well be a unique way of building intake towers; I really wouldn’t know. The basic principle, however, is extremely well established for building tall, narrow, hollow things. Nice video on it here.

johnboy 12:53 pm 27 Sep 11

well they’re the ones claiming it’s unique!

Spectra 12:50 pm 27 Sep 11

Intriguing that they’re building the intake tower by jacking up the base and shoving the next tier in at the bottom.

I’m not quite sure where you got that idea – it looks like (and was described as) a standard jump-form system. The formwork is in that white bit at the top, the concrete is poured into it (you can see the concrete pump arm on the left) and when that’s set the formwork is “jumped” up to the next level and the process repeated. It’s exactly the same system you’ll see used in building elevator shafts for most buildings.

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