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Old June 20th, 2012, 08:02 PM   #3161
kanye
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Old June 20th, 2012, 11:22 PM   #3162
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begin of preparations for the first pour?
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Old June 20th, 2012, 11:29 PM   #3163
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Looks good.
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Old June 21st, 2012, 01:46 PM   #3164
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There is progress on this now, sure it's slow but at least the progress is visible now.
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Old June 21st, 2012, 08:57 PM   #3165
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Progress was visible a few days ago too, this same group of workers.
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Old June 23rd, 2012, 01:45 PM   #3166
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Old June 23rd, 2012, 05:59 PM   #3167
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Quote:
Originally Posted by TRSB View Post
It seems to be on hold
More likely the heavy rain and 15 cm of water.

They are building a 660m ST.

They are going to take the time to get the foundation laid correctly and have the base for the super column be top-notch.
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Old June 24th, 2012, 06:41 AM   #3168
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Hi all.

Let's not forget the piles for this project were dug BY HAND.
And now some expect the thing to shoot up like a beanstalk ...

What's the hurry anyway ... ?


Ray.
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Old June 24th, 2012, 07:18 AM   #3169
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Why were they dug by hand vs. machine? Also how are piles usually dug in?
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Old June 24th, 2012, 09:03 AM   #3170
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Quote:
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Why were they dug by hand vs. machine? Also how are piles usually dug in?
I think because of the subway nearby.
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Old June 24th, 2012, 09:12 AM   #3171
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Nah, we've seen several construction sites in shenzhen using this method. I think it has nothing to do with the metro. The reason was most likely the size of the piles. I have never seen such piles constructed anywhere else. It seems to be characteristic to this city. Maybe because of it's soil conditions or simply because it's cheaper than using heavy machinery, which as we've seen used to be often replaced by more primitive techniques on this site. Remember pouring of the concrete slab?
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Old June 24th, 2012, 01:13 PM   #3172
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Soil in Shenzhen, unlike Shanghai (which is muddy), is stable which means they don't need very advanced and deep-digging techniques. Right?
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Old June 24th, 2012, 05:22 PM   #3173
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Circular foundation holes reminds me of the Chicago Fordham Spire (aka Chicago Spire).
"The Chicago Spire was a supertall skyscraper project in Chicago, Illinois, which was abandoned in 2008 with only its foundation work completed."
http://en.wikipedia.org/wiki/Chicago_Spire

Last edited by kanye; June 24th, 2012 at 05:33 PM.
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Old June 25th, 2012, 01:16 AM   #3174
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Quote:
Originally Posted by Pansori View Post
Soil in Shenzhen, unlike Shanghai (which is muddy), is stable which means they don't need very advanced and deep-digging techniques. Right?
True. You can see that from page 90 on.
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Old June 25th, 2012, 02:27 AM   #3175
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Hi all.

Quote:
Originally Posted by FM 2258 View Post


Why were they dug by hand vs. machine? Also how are piles usually dug in?
Hi FM.

Most projects use pile rigs to install the piles before excavating the site. They then drop in the rebar cages and pour the concrete up to what will be just above the bottom of the planned excavation. This allows freedom of movement for the rigs. Once they get near the bottom of the excavation they carefully dig out around the pile caps that they then break, leaving the rebar sticking up to be tied in to the raft rebar they put in later. The Shanghai Tower used this method for the piles under the main structure.
Some do the piles after excavation and pour right to the top, then they only have to dig a few feet to expose the pile caps.

I agree with Pat, the size of these piles may have some bearing on the method. That being said, there is no reason I can see that they couldn't have used piles that are say, 1.5 meters in diameter and put them in with rigs, before beginning the top down process they used on the podium lower levels. Perhaps the budget is extremely tight for the foundation stage for the projects in this geographical area.

The caveman methods used in various procedures in this project, notwithstanding, the overall sequence in the foundation stage for both this project and the ST are interesting.
Here they top downed the podium lower levels, leaving the hole for the main structure, hand dug the piles, poured the raft (using some very low tech procedures), and are in the process of doing the main structure lower levels conventionally.
On the ST project they did the piles, dug the hole for the main structure, and did the main structure lower levels conventionally while simultaneously doing the podium lower levels using the top down method.
Both sequences are a little strange and very interesting.


Ray.
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Old June 25th, 2012, 02:37 PM   #3176
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Old June 25th, 2012, 02:45 PM   #3177
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Ahhh you just beat me Kanye! This is progress I can believe in!!!!
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Old June 25th, 2012, 05:54 PM   #3178
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Woah.
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Old June 25th, 2012, 08:53 PM   #3179
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how thick will the concrete be around the steel walls that are going up in the last pic please ?. if i am right thinking that is what will happen ?
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Old June 25th, 2012, 10:57 PM   #3180
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Seriously now, I can't wait to see Ping An above ground!
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