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Old August 5th, 2012, 10:36 PM   #3041
patrykus
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I live in Poland and I once seen it on a podium/mall, but never on a tower. Anyway I presented some more arguments than just this.
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Old August 5th, 2012, 11:54 PM   #3042
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One of the interesting aspects of construction is the different methods that are used in different parts of the world, or within a country. Sometimes it's tradition, or simply the choice of the contractor to get the job done. Whatever it takes to meet the construction schedule.

With pumps, the concrete has to have a higher slump (more "liquid) in order to be pumped and flow through the piping to the placement location. Low slump (stiffer mix) concrete is better handled with a bucket. The choice of method depends on the job requirements.
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Old August 6th, 2012, 12:40 AM   #3043
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Here is a building, actually one of two residential towers that was done using the bucket method of concrete delivery. This is Silver Towers (600 W.42 Street).


Here are the two buckets at the street, of 3 cubic yards each, with 12,150 pounds of concrete and a bucket weight of 2000 pounds, for 7.075 tons total weight .



I timed the hoisting portion of the cycle, which came to about one minute and twenty-five seconds from bucket full to pouring the slab. When I took these photos, this tower was about 40+ stories.
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Old August 6th, 2012, 04:44 AM   #3044
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One 57 is being built wit this method too.
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Old August 6th, 2012, 07:27 AM   #3045
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yep. both in the US. Yet to see a supertall/skyscraper build with this method somewhere else.
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Old August 6th, 2012, 12:22 PM   #3046
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I've seen it used on a couple of towers in Japan, but it's not as common as using prefab elements for concrete towers.

Anyway, I'm looking forward to see how the work will be developing on the site this new week.
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Old August 6th, 2012, 02:41 PM   #3047
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Another workweek, another Monday on the job.
Preparations begin for placing tendons into the five south tower pads. The drill is working on the last of the tower pads, grouting mixers have been placed, along with the bags of cement. Forms may be stripped from the west wall that was cast last week.
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Old August 6th, 2012, 04:06 PM   #3048
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what was that tower in the last pic please ?
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Old August 6th, 2012, 04:57 PM   #3049
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Quote:
Originally Posted by patrykus View Post
yep. both in the US. Yet to see a supertall/skyscraper build with this method somewhere else.
seriously does it really matter? as long as the building gets built were fine
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Old August 6th, 2012, 06:33 PM   #3050
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The drill is now being lifted upon a waiting truck after drilling it's final holes in the last tower pad.
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Old August 6th, 2012, 06:38 PM   #3051
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As the drill makes its way out of the site, the last of the tower pads have been drilled, and the tendon installation has begun. The mini-excavator appears to be backfilling around the core footing, and the larger Hitachi 850 was breaking rock adjacent to the 56th Street perimeter wall for footings there.
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Old August 6th, 2012, 08:01 PM   #3052
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The barricades on 56th Street are being relocated, so concrete delivery will be for the new footing adjacent to the perimeter wall that was excavated earlier. The mini-excavator continuies with backfilling against the core footing, most likely in preparation for pouring another section of slab on grade after waterproofing membrane is installed. The triple-boom Hitachi continues with tendon installation, which might be its final tasks at this site.
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Old August 6th, 2012, 08:05 PM   #3053
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I see the perimeter column tendons in place now on the bottom side of the 56th view. A also see that the slab for the perimeter columns have been poured into one platform. I have a question, underground, will the perimeter columns be connected to form essentially a perimeter wall, or will they be only connected like on the above ground part?
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Old August 7th, 2012, 05:09 AM   #3054
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i think that's common in areas with soil instabilities. But noting this buildings height and thinness, it sounds like a possibility.
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Old August 7th, 2012, 10:19 AM   #3055
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The bedrock already connects the perimeter columns. The tendons anchor the columns and the core into this solid piece of stone, there's no need to make a solid wall from the current level up and they won't go down into the bedrock anymore. That will only make the this natural foundation weaker.
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Old August 7th, 2012, 03:56 PM   #3056
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Old August 7th, 2012, 05:04 PM   #3057
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Today's job report:
Tendon installation continues on the south footing pads. Those footings should be formed soon. The smaller excavator is currently backfilling the void within the core footing. My thoughts were that they would have dewatered the void before backfilling. Earler, this excavator backfilled along the north side of the core footing. It is my guess that preparations may begin for pouring another section of the slab on grade. Forms are being stripped from the west walls cast last week.
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Old August 7th, 2012, 05:33 PM   #3058
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The dirt used for backfilling - where does it come from? Is it from the site or trucked in?

How do they make sure it doesn't settle once concrete is poured on top of it?
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Old August 7th, 2012, 05:58 PM   #3059
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And now, as I write, the final tendon is being installed. The dirt has come from the various excavations that took place on site while hammering and digging rock for footings, which is mainly rock dust. They may run the excavator back and forth, using its tracks for compaction before placing the waterproofing membrane. Since it rests on the bedrock, there is no settling.

Please, anyone else that has additional info, please chime in!!
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Old August 7th, 2012, 07:00 PM   #3060
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It's interesting to see that the number and position of the tendons are different on every pad. From this you can see that the perimeter columns on the corners will face the most upward pressure when the tower is completed. And that the designers take into account that the forces that will pull and push on the tower foundations will be different on all 4 corners.

It's fantastic that with the webcams we can see such small things that are very important for the foundation that we usually don't see.
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