NEW YORK | 432 Park Ave | 426m | 1398ft | 89 fl | U/C

[Ajaypp]

Originally Posted by thejacko5

rebar couplings are also really damn expensive.

But they also help to reduce wastage of rebar and usually pay back the additional expenses. I remember recommending this as part of value engineering to a large engineering conglomerate in India.

[Eric Offereins]

Originally Posted by JohnFlint1985

this is actually a stronger way of making the "box". more expensive and time consuming too.

More time consuming? They can make these rebar cages off site (prefab)

[AltinD]

Originally Posted by UrbanRat

Wow, an austrian firm shapes that building! --> DOKA

Why so amaized? They are No. 1 afterall in their line of work

Originally Posted by JohnFlint1985

I think this is perimeter siding for cement structure.

Well, they provide formworks, and that;s what the picture shows

[JohnFlint1985]

Originally Posted by Eric Offereins

More time consuming? They can make these rebar cages off site (prefab)

doubt they can do this. this is a complicated site with irregular plan. I am positive all the cages have to be custom made on site. It is not like it is very difficult, but it is more time consuming. Just think of a nail that you can put into a wood by power hummer in a second. And then if you need to do the same with the screw. It is a much stronger construction, wood will never splinter from screws and longer lasting effect. But it takes more time and thus money. same thing here. But it is a better way.

[MrSlippery519]

Originally Posted by JohnFlint1985

doubt they can do this. this is a complicated site with irregular plan. I am positive all the cages have to be custom made on site. It is not like it is very difficult, but it is more time consuming. Just think of a nail that you can put into a wood by power hummer in a second. And then if you need to do the same with the screw. It is a much stronger construction, wood will never splinter from screws and longer lasting effect. But it takes more time and thus money. same thing here. But it is a better way.

We have seen trucks pull up with the cages on the back so they are absolutely being done offsite.

[CCs77]

Originally Posted by MrSlippery519

We have seen trucks pull up with the cages on the back so they are absolutely being done offsite.

Indeed we did see that.
But whatever they made those in site or offsite, they are prefabricated anyway, meaning that while they are pouring the columns of one level, they can already be assembling the rebar cages of the next (whatever if it is in or offsite) making the overall speed of construction faster, not slower.

[MrSlippery519]

Originally Posted by CCs77

Indeed we did see that.
But whatever they made those in site or offsite, they are prefabricated anyway, meaning that while they are pouring the columns of one level, they can already be assembling the rebar cages of the next (whatever if it is in or offsite) making the overall speed of construction faster, not slower.

Exactly spot on.

[600West218]

What are the blue beams?

[ZZ-II]

Originally Posted by 600West218

What are the blue beams?

i saw these blue beams yesterday already. it could be a part of the climing-formwork system for the core. but not sure though

[MrSlippery519]

Originally Posted by 600West218

What are the blue beams?

Someone mentioned its likely the vehicle hydraulic elevator

[thejacko5]

its probably for the material hoist

[MrSlippery519]

Looks like the core is starting another jump

[Kanto]

Originally Posted by ZZ-II

i saw these blue beams yesterday already. it could be a part of the climing-formwork system for the core. but not sure though

They look like thinner steel columns. I dunno but aren't they an additional reinfocement of the core?

[McSky]

[jconyc]

The blue structures in the core must be for the core elevators and as stated before the rectangular blue structure must be for the truck elevator and will soon be placed in the rectangular hole elevator shaft just behind it.

I stand corrected...on giving it a closer look it appears that the blue structures are all part of a sliding form for the inner walls of the core including the walls for the five elevator shafts within the core...it appears that they will form the walls first then move the form up and then pour the core floor spaces after???

[tim1807]

It looks like that indeed, you can see similiar steel on the core and the structure wouldn't fit in the hole behind it.

[DinoVabec]

Is that steel for the cube down there in the pit?

[Buyckske Ruben]

Originally Posted by McSky

Its a ugly building and hase a boring look.
But its rising fast and it is a pretty high building


I mis that on the top of the building with a spire on top but it isnt.

Originally Posted by Eric Offereins

30 september:

[Builder37]

Reinforcing couplers are not cheaper and are typically only used when required by specification or if the means and methods of construction necessitate it. That said, in some instances, couplers do increase production; especially when the dowels would need to pass through formwork. Additionally, any bar that is a #14 or larger must be coupled per ACI and any time bars are "bundled" they must be coupled.

The "blue steel" is part of the core climbing system. See http://www.doka.com/doka/en_us/produ...snew/index.php for description of the system you are looking at on this project. What separates this system from the rest, is that it will jump the entire core system - formwork, pump booms and mini-hoist - in one movement of the hydraulic rams; there is no ratcheting action. The following is a graphic of the system to be utilized:




As it relates to the column cages, all them will be built off-site and ahead of schedule. This is certainly the most efficient way this can be done. Please note that both the columns and the spandrel beams are actually high-strength threaded bars - like foundation tie-backs - and not traditional reinforcing.

In terms of schedule, the bottom half the building is schedule to be a 4 day cycle for typical floors and the top half will be on a three day cycle.

I hope this clears some stuff up for you guys...

[CCs77]

Thank you very much for that information.

Are you part of the crew of this building, or related in some form to its construction? for such specific information you gave, it seems so.