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Quick Erection

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Quick Erection

Old 11th Mar 2015, 19:58
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Quick Erection

Not a thread about Viagra or some variant, but the seemingly incredible speed at which these buildings were erected. Assuming that they are structurally sound, it's an impressive feat all in all.

Chinese firm builds 57-storey block in 19 days at a rate of three floors a day | Daily Mail Online

There's a largish house being built near me that is now almost 3 years in the making. It's for a discrete high worth individual and the spec is second to none, but all the same it's taken an age, especially when most of the sub-structure is of pre-cast concrete. Perhaps they should've used Chinese workers



SHJ
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Old 11th Mar 2015, 20:12
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Ignoring the Napoleonic granite bit underneath, the concrete bit on top it is rumoured was constructed at the rate of 30 feet a day in the vertical. This during the Occupation.
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Old 11th Mar 2015, 20:22
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For the secrets of quick erection, one might study this phenomenon or this other one.

If this building is still there in a hundred years, I'll be impressed. Betting the under on that one. I seem to recall a shopping mall/store in Korea that came down a few years ago in a horrible mess, quite a few people dead, which was put up without due regard to a lot of codes.

I would suspect that this building's "record breaking" production rate has ample risk of same.
Block party: It was originally planned to be built up to a height of 220
stories, but it was cut down because of concern it was too close to a nearby
airport
At least somebody injected a modicum of common sense into this operation.
^^ Yes, I know, aviation content is not allowed on JB ... ^^
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Old 11th Mar 2015, 21:25
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Quick Erection

Didn't a block collapse somewhere recently killing lots of people, and was put down to the fact it had been thrown up in a very short space of time ? It's not big and it's not clever
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Old 11th Mar 2015, 22:14
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I have never, in fifteen years of working in China, heard of a steel frame building collapsing. Most of the **** or ***** hotels I have been in have been outstanding both inside and out. The apartments I have lived in have been to a standard one would expect dependent on the rent. Some good some bad, but I have never suspected the basic structure of the building.
I have a feeling that the timing for this building was AFTER the hole was dug, the piledriving completed and the underground services and car parks finished so the clock started at surface level.
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Old 11th Mar 2015, 22:30
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The fastest I heard was for ground level cottages. Floor slab trucked in, wall panels erected, roof on, services connected and state issued furniture carried in. 20 minutes!
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Old 11th Mar 2015, 22:47
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I'd agree that the buildings are probably solid, as long as decent foundations were dug and affixed. The rest is obviously Meccano on a large scale and again as long as they use the requisite grade of steel it should be ok. In a way the building was prefabricated, so the erection was simply putting things back together.


SHJ
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Old 12th Mar 2015, 00:33
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Nine held over Shanghai building collapse - Telegraph
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Old 12th Mar 2015, 09:46
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Looking at those buildings it seems that the construction is pretty tough, you could almost lean them up again and dust them down................. now the piling appears to have been very sub standard
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Old 12th Mar 2015, 11:05
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Been watching a building down the road go up at a high rate of knots.

Some pillars are crooked, some pillars are fatter than others, even seen a concrete quality inspector scare the willies out of the construction crew. I guess once you dress it you can hide all its faults.

Been also watching a bunch of low-rise buildings go up in my neighbourhood. $600k for a shoebox?

With so many buildings going up so fast there are many opportunities for the unscrupulous to exploit, and they do.
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Old 12th Mar 2015, 11:30
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Pah! Tis nothing. Observe.

Ringway Tower

My absolute apology to the PPRuNe elite for linking to the GODDAMN, leftist, pinko, etc, etc BBC.
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Old 12th Mar 2015, 12:18
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We Aussies did this style of speed-building nearly a century ago.

ANZAC Cottage - the house that was built in a day

ANZAC Cottage (precisely defined as a 4-room brick, timber, and tile-roofed bungalow) was erected in 1 day on 12th February 1916, as a community effort to award a home to an injured, returned ANZAC soldier - and to be an ANZAC memorial to the Gallipoli campaign.

70 drays of building materials were gathered on the site and the construction was commenced by approximately 200 men, at 3:30AM on the 12th February, initiated by the ringing of a bell and an announcement by a town crier.

At 5:00PM on the same day, a flag with ANZAC on it was raised, and the basic house structure, fencing and lawn was declared completed.
The interior and final detail of the bungalow was finished off by tradesmen over the next four to five weeks.

The house was awarded to a Pte John Porter who initially declined the gift. However, he was persuaded to accept it, and lived in the home until his death in 1964. His wife lived in the house until her death 4 years later.

The State Library of W.A. has digitally reproduced a copy of the souvenir booklet produced to commemorate the event. This little booklet is amply illustrated with photos of the event proceeds and construction.

Souvenir of the construction of ANZAC Cottage

Last edited by onetrack; 12th Mar 2015 at 12:31.
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Old 12th Mar 2015, 19:48
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The rest is obviously Meccano on a large scale and again as long as they use the requisite grade of steel it should be ok
Not just the steel, but the right grade bolts as well. Had to replace all the bolts in building once because the guys who started the job had used 5.3s instead of the 8.8s which the stress engineer had specified. Luckily the Building Inspector spotted a couple of stripped bolts and saw they were the wrong grade. He said at first he thought a couple of duff bolts had slipped in until he checked the numbers and found they were all gash.
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Old 12th Mar 2015, 21:33
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Awfully rare to use grade 8 on a building I would have thought.
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Old 13th Mar 2015, 00:20
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Awfully rare to use grade 8 on a building I would have thought.
The property class is normally stamped on the head of the bolt. The two figures indicate the tensile and yield strengths of the bolt or screw.

In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.

Whether things have changed since the 1980s I don't know but we generally used 20mm 24mm and 30mm dia bolts and on one occasion 36mm dia bolts and nuts all 8.8. As we mostly built farm buildings and filling station canopies we didn't use really big stuff.
The length of the bolt had to allow for at least one complete thread or preferably one and a half threads to protrude from the nut and the threaded portion of the shank was not allowed to enter more than 20% (IIRC) of the plate forming the nut side of the joint and definitely no set screws allowed on any structural joints. No paint was allowed on any joints in shear as it acted as a lubricant and would allow the joint to slide. Nuts and bolts had to be the same grade. We once received a large order of nuts and found that they had mixed low tensiles in with the batch so we had to spend a whole afternoon fishing out the duds so we could send them back.
We did use 12mm and 16mm 5.3s to bolt on the rolled sheet Zeta purlins to take the cladding but as mentioned all structural stuff was done with 8.8s

I seem to remember that we did one building where part of it was preloaded the same as they do with car cylinder heads, we used 10.9s for that and had to order them specially as they were not stocked by the suppliers we normally used.
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