NEW YORK | One World Trade Center | 1,776' Pinnacle / 1,373' Roof | 108 FLOORS

[NYCLuver]

March 16th, 2010

http://i802.photobucket.com/albums/yy306/DKNY619/IMG_1188.jpg

[2-TOWERS]

i love it

[OneWorldTradeCenter]

I love it, too. The tower looks amazing. And the concrete core looks very massive!:cheers:

[kinggober]

Based on the size of the people in this image it looks like they steel that's being installed is for 4 office floors not 2. Maybe it's just my perspective, but it looks like the new beams are 30 feet apart.
http://farm3.static.flickr.com/2787/4440891404_f725584e24_o.jpg

[NYguy]

Based on the size of the people in this image it looks like they steel that's being installed is for 4 office floors not 2. Maybe it's just my perspective, but it looks like the new beams are 30 feet apart.


There's no way that's 30 feet. Maybe the angle is throwing you off.

[evanmack]

Are those even people??? ^^^

[OneWorldTradeCenter]

Are those even people??? ^^^

Yes, I think ironworkers

[sbarn]

Wow this thing is going to be massive. :cheers:

[canadate]

Based on the size of the people in this image it looks like they steel that's being installed is for 4 office floors not 2. Maybe it's just my perspective, but it looks like the new beams are 30 feet apart.


Probably high ceilings.

[OneWorldTradeCenter]

Wow, I wonder how much pressure is on that steel beams (the 24 steel columbs in the lobby). How many tons of material! And they will put several more floors (about 80) onto it!

[MadGnome]

Limiting factor might be having to pour the floors one at a time and needing to let one cure for so long before they can pour the next. And eventually, the core will be as far below the steel as it can be and that will limit the vertical speed. I'm about 30 years out of date concrete wise. I'm not sure how long those three foot thick walls need to cure before they can add to them, or if the floor have temporary supports while they're being poured.

[canadate]

A little old..took these about 2 weeks ago. Sorry I'm posting them so late. I was at the site yesterday but it was dark and I didn't have my tripod on me. I did scope out some new views though so stay tuned for that and night shots within the next month or so.

http://i973.photobucket.com/albums/ae212/canadate/DSCF5084.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5086.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5087.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5088.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5089.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5092.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5093.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5100.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5102.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5104.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5106.jpg

[hunser]

:previous: those are some fine shots, i especially like the first four- very rare angle!

[brenGT2]

Just imagine the view in that third shot in a few years! It will be extremely prominent from that angle.

[Zensteeldude]

Is that just the towers or does it include all the underground space as well? (Memorial, parking, VSC etc.)

Just office and retail, no "support" space is included. (most of the retail is below grade, as it was in the origonal WTC)

[Zensteeldude]

Based on the size of the people in this image it looks like they steel that's being installed is for 4 office floors not 2. Maybe it's just my perspective, but it looks like the new beams are 30 feet apart.

The new beams are 13' 4" apart, same spacing as the girt tubes on the base.

Wow, I wonder how much pressure is on that steel beams (the 24 steel Columbus in the lobby). How many tons of material! And they will put several more floors (about 80) onto it!

The structural steel is about 45,000 tons, concrete weighs 140 pounds per cubic foot. The floor slabs average 30,000 square feet (including the core.) Here it gets a little tricky, some slabs are 6", some are 8" and some are 12" thick. About 400 tons for the spire, another 6,000 tons for the cooling towers and comunications rings. Let's just say ALOT!

Now I am going to blow your mind, under max wind load the windward columns well be under tension, alot of tension. This is where the rock anchors in the foundation come into play.

Limiting factor might be having to pour the floors one at a time and needing to let one cure for so long before they can pour the next. And eventually, the core will be as far below the steel as it can be and that will limit the vertical speed. I'm about 30 years out of date concrete wise. I'm not sure how long those three foot thick walls need to cure before they can add to them, or if the floor have temporary supports while they're being poured.

If they sequence it right ( and I'm sure they well) the level below cures as they ready the next floor for pouring. Same with the core.

[NewYorker2009]

If anyone is interested they just added a new camera view of One World Trade Center on www.wtcprogress.com. Perfect shot of it also.

[Continental180]

If anyone is interested they just added a new camera view of One World Trade Center on www.wtcprogress.com. Perfect shot of it also.

thanks for the link..

i think we should put that on the first page also.

[FerrariEnzo]

canadate, nice angles...

[NYguy]

thanks for the link..
i think we should put that on the first page also.


Added.

[Yael]

I'm glad to see that they are finally speeding up the work, it was taking forever to build this tower, but finally the rising returns.
From now on the updates are going to be from floor after floor and so on.

[Metro Matt]

From the East Texas to East Coast, one Tyler company is leaving its thumbprint on a piece of New York City's Freedom Tower.

About a year ago, Tyler Pipe Co. accepted an order for pipe to use in the construction of the Freedom Tower in New York City.

Rather than just fill the 250,000-plus-pound order, Thad Hicks, the company's east regional sales manager who sold the pipe, wanted to commemorate the events of Sept. 11, 2001.

He suggested stenciling each cast-iron pipe with a tribute: "We will never forget 9-11-01."

"Every time I'm up there and on the site, it's just an eerie feeling," he said. "You can't go up there and be on that site without thinking about it. ... The caption just says it all: As long as you're breathing, you won't forget."

Compared with the enormous structure, the stenciling is small, but speaks volumes for a lot of people, not just in New York, but everywhere, Hicks said.

"These pipes will be on there hundreds of years," he said. "No matter what happens, if they tear a wall down or move things around, those pipes will always be there and that phrase will always be there."

Construction on the 104-story, 1,776-foot, Freedom Tower began in 2006 in the northwest corner of the World Trade Center site and is scheduled for a 2013 completion.

John Springer, the comptroller at Tyler Pipe Co., said he was honored to contribute to the project.

"Just the fact that this is going in the World Trade Tower and it's patriotic in the local area makes me proud," he said.

http://tylerpaper.com/article/20100313/BUSINESS01/3130333/-1/BUSINESS

[NYCLuver]

March 17th, 2010

http://i802.photobucket.com/albums/yy306/DKNY619/IMG_1215.jpg

[Spud]

Based on the size of the people in this image it looks like they steel that's being installed is for 4 office floors not 2. Maybe it's just my perspective, but it looks like the new beams are 30 feet apart.
http://farm3.static.flickr.com/2787/4440891404_f725584e24_o.jpg

I very much doubt they'd place the steel for a floor and require structural steel to be placed at a later date below. The sequence for loading up the floors with materials has to be very well thought out.

[Spud]

Limiting factor might be having to pour the floors one at a time and needing to let one cure for so long before they can pour the next. And eventually, the core will be as far below the steel as it can be and that will limit the vertical speed. I'm about 30 years out of date concrete wise. I'm not sure how long those three foot thick walls need to cure before they can add to them, or if the floor have temporary supports while they're being poured.

The engineers in our earthquake prone city generally ask for seven days. There are fast curing mixes however that can be loaded in as little as 48hrs. On the last high rise I managed we were using this stuff called "self compacting concrete". It came out of the truck as a slurry and required no vibration. It would pour out of a hole as small as one inch until it was plugged!

From memory I think we were reaching 40mpa after 48hrs (A house slab is 17.5mpa, A high rise floor slab is 30mpa, A crane base is 50mpa) I have no idea how the aggregate stayed suspended in the mix, but somehow it did. When we stripped the form work we obtained a near perfect finish on the concrete. No bubbles, no segregation, no grout loss. It was quite remarkable. The downside was that the stuff was over double the price of a normal 40mpa mix, however with the amount of reinforcing in the columns and the fast floor cycle required it was our only option.

[Domamania]

The engineers in our earthquake prone city generally ask for seven days. There are fast curing mixes however that can be loaded in as little as 48hrs. On the last high rise I managed we were using this stuff called "self compacting concrete". It came out of the truck as a slurry and required no vibration. It would pour out of a hole as small as one inch until it was plugged!

From memory I think we were reaching 40mpa after 48hrs (A house slab is 17.5mpa, A high rise floor slab is 30mpa, A crane base is 50mpa) I have no idea how the aggregate stayed suspended in the mix, but somehow it did. When we stripped the form work we obtained a near perfect finish on the concrete. No bubbles, no segregation, no grout loss. It was quite remarkable. The downside was that the stuff was over double the price of a normal 40mpa mix, however with the amount of reinforcing in the columns and the fast floor cycle required it was our only option.

can you please translate what MPA means, Thank you.

[JACKinBeantown]

Based on the size of the people in this image it looks like they steel that's being installed is for 4 office floors not 2. Maybe it's just my perspective, but it looks like the new beams are 30 feet apart.
http://farm3.static.flickr.com/2787/4440891404_f725584e24_o.jpg

I think it's an illusion. I think the people are standing further back from the edge, so they look smaller in perspective. Plus, their feet are hidden by the floor edge and their heads are hidden by the beam, so they appear shorter than they really are.

[shakman]

can you please translate what MPA means, Thank you.


Relative to pressure, mpa is an acronym for Megapascals which is the metric version of psi.

http://www.mc2-ice.com/support/estref/popular_conversion_files/concrete/concrete_strengths.htm

[You Need A Thneed]

Relative to pressure, mpa is an acronym for Megapascals which is the metric version of psi.

http://www.mc2-ice.com/support/estref/popular_conversion_files/concrete/concrete_strengths.htm

and for example, 30 mPa concrete means that 30 megapascals (4351 psi) can be put on the sample before it will fail (crush) when they do the strength test.

[FerrariEnzo]

From the East Texas to East Coast, one Tyler company is leaving its thumbprint on a piece of New York City's Freedom Tower.
...
He suggested stenciling each cast-iron pipe with a tribute: "We will never forget 9-11-01."

"Every time I'm up there and on the site, it's just an eerie feeling," he said. "You can't go up there and be on that site without thinking about it. ... The caption just says it all: As long as you're breathing, you won't forget."

"These pipes will be on there hundreds of years," he said. "No matter what happens, if they tear a wall down or move things around, those pipes will always be there and that phrase will always be there."

http://tylerpaper.com/article/20100313/BUSINESS01/3130333/-1/BUSINESS

Great gesture, now lets "lay some pipe!" :D

[FrancoRey]

Just out of curiosity, what is the the minimum Richter Scale intensity for an earthquake that NYC buildings have to withstand to pass building code? Obviously before the modern era this was a non-issue but I imagine most buildings built in the last 40 years have to be re-enforced. Anyone know more about this subject? When did they begin retrofitting structures for earthquakes in NYC? Laws? Code?

[CalibratedZeus]

There are actually a few more web-cams that have at least some view of the rising tower.

Rebuild Ground Zero Cam (http://rebuildgroundzero.org/webcam/rgz_000.jpg?refresh=60&altText=Groud+Zero+Webcam+-+Rebuild+Ground+Zero+.org&camImgY=768&camImgX=960&imageurl=http://rebuildgroundzero.org/webcam/rgz_000.jpg)

^ This one gets a lot of glare during the morning/afternoon, much better quality once the sun goes behind the World Financial Center.

Millenium Hotel (http://www.earthcam.com/swf/cam_player/enlarge_image.php?type=live&path=http://63.229.55.21/ec_metros/ourcams/milleniumhilton1.jpg&name=World%20Trade%20Center%20&width=640&height=480&img_width=320&img_height=240)

^ Pans around the entire site a lot, has a low resolution but refreshes about every two seconds, great for seeing the work in action.

Low Res (http://www.earthcam.com/swf/cam_player/enlarge_image.php?type=live&path=http://63.229.55.21/ec_metros/ourcams/millenium2.jpg&name=Freedom%20Tower&width=640&height=480&img_width=640&img_height=480)

^ Same as the higher res earth-cam we all know and love, but lower resolution and with a two second refresh rate, once again shows the work in action much better then the high-res.

Wired New York (http://www.wirednewyork.com/webcam/)

^ Nothing can be seen right now, but once the tower starts to rise above the current skyline you will be able to see it on this cam.

ABC 7 (http://abclocal.go.com/wabc/feature?section=resources/traffic&id=5780747)

^ From across the Brooklyn Bridge, again nothing now, but soon.

[NewYorker2009]

Great News Folks! The answers from www.wtcprogress.com regarding One World Trade Center are now on there. According to Lynda Tollner, program director in the World Trade Center Construction Department with design and construction responsibilities for One World Trade Center, she projects the Tower will reach between the 55th and 60 Floors by the end of 2010 and it will have a total of 105 Floors. So feel free to examine some of the questions and answers.

[shakman]

and for example, 30 mPa concrete means that 30 megapascals (4351 psi) can be put on the sample before it will fail (crush) when they do the strength test.

I believe, according to ASTM code requirements, strength tests are done at 7, 14 and 28 days. In some instances 56-days.

[speedy1979]

Just out of curiosity, what is the the minimum Richter Scale intensity for an earthquake that NYC buildings have to withstand to pass building code? Obviously before the modern era this was a non-issue but I imagine most buildings built in the last 40 years have to be re-enforced. Anyone know more about this subject? When did they begin retrofitting structures for earthquakes in NYC? Laws? Code?

Here's what I was able to find.

http://www.columbia.edu/cu/record/archives/vol20/vol20_iss19/record2019.18.html

Scientist's Earthquake Codes Adopted

Photograph (http://www.columbia.edu/cu/record/archives/vol20/vol20_iss19/record2019.12c.gif): Behind and to the right of Mayor Giuliani at the signing was Klaus Jacob, senior research scientist at Lamont-Doherty Earth Observatory, who helped write New York City's first earthquake codes. Photo Credit: Edward Reed.
Photograph (http://www.columbia.edu/cu/record/archives/vol20/vol20_iss19/record2019.21c.gif): Seismologists at Lamont-Doherty Earth Observatory, Noel Barstow, center, and John Armbruster, right, deploy portable seismometers on the Tappan Zee Bridge to evaluate how the Hudson Rover crossing would respond to an earthquake.
New York City Mayor Rudolph Giuliani last week signed into law the city's first earthquake building codes, requirements that Columbia seismologist Klaus Jacob long championed and helped write.
Jacob was at the Mayor's side last Tuesday for the official signing. The codes set minimum construction standards to make buildings resistant to earthquakes registering up to 5.5 on the Richter scale. They will apply to all new buildings more than three stories high.
"In cities, earthquakes by themselves don't cause the major loss of life; collapsing buildings do," Jacob said. "And New York City was built mostly without quakes in mind."
Jacob played a major role in alerting the public to the geological evidence that the U.S. East Coast--and New York City in particular--is not immune to earthquakes. As a member of the committee that drafted the new codes, Jacob also applied research on how different rock and soil types dramatically affect ground shaking caused by earthquakes.
"The historic record of earthquakes during the last three centuries in the eastern U.S. and in New York City, and geological findings elsewhere along Atlantic Coast, all provide solid reasons why one should take the eastern earthquake threat seriously," he said.
New York City's largest known quake, which registered between magnitude 5 and 6, occurred in 1884. It toppled chimneys, shattered windows and caused panic in the streets, but because it was centered about 15 miles offshore, no buildings collapsed and nobody was killed.
In 1985, a magnitude 4 quake centered in Ardsley in Westchester County was felt in New York City.
"Today, in high-rise New York, a magnitude 5, which is likely to strike the metropolitan area every 100 years, could cause $1 billion in damage and some loss of life," he said.
Chance Is Slim
"New York State has experienced four quakes of magnitudes 5 to 5.7 since 1884. Magnitudes 6 and 7 quakes, such as the one that devastated Kobe, have struck elsewhere along the East Coast and, based on geology, the possibility of such a strong quake in New York City is slim, but cannot be ruled out."
The probability of East Coast quakes is much lower than in the western U.S., where seismically active crustal plates collide, Jacob said, "but the older, harder rocks near New York transmit energy more efficiently over longer distances," producing the potential for a greater swath of destruction.
Unlike the West Coast, East Coast builders have largely ignored the threat of earthquakes, Jacob said. "Townhouses of unreinforced masonry, such as New York's Victorian-era brownstones, are especially vulnerable. Such buildings could crumble to rubble and dust in a quake, causing multiple injuries and asphyxiation."
Even high-rises are at risk if they are built on soft soils, which dramatically amplify ground shaking and often become liquid-like during earthquakes, he said. Unlike the World Trade Center and the Empire State Building, which are more safely anchored on rock, Battery Park City, Starrett City and Co-op City are all built on soft soils, he said.
The new seismic safety codes require that builders consider soil and rock conditions on which new structures are constructed. They require that masonry be reinforced to prevent it from falling during a quake and injuring people below.
In addition, new buildings will have to have reinforced foundations, strengthened joints, iron rods in walls, anchors connecting floors to exterior walls, and revised load factor formulas--all designed to keep buildings standing.
Jacob began his career studying earthquakes in Alaska, where large earthquakes frequently occur. But in the early 1980s he shifted his focus to the East Coast. "Though the frequency of earthquakes is not as great, we have tremendous risk here and a real need for the seismological knowledge we have accumulated to be applied right in our own backyard."
In 1986, Lamont-Doherty became a founding member of the National Center for Earthquake Engineering Research, a consortium of research institutions with a mission to apply seismological research to mitigating earthquake destruction.
Under NCEER auspices, Jacob organized conferences in the late 1980s attended by geologists, engineers, builders and government officials, which highlighted the East Coast earthquake risk and helped generate momentum to find ways to reduce it. Joining the committee to draft New York City's new code, he headed a subcommittee that focused on geotechnical issues.
"I sought to have an impact by providing the scientifically sound background to convince people of the need, " he said. "No city will ever be earthquake-proof. But we build our cities on an Earth that has its own agenda, which we ignore at our peril.
Race Against Time
Earthquake hazard mitigation is a constant race against time--human time against geologic time. The new building codes will have a real benefit in 50 to 100 years , as one by one, New York City structures are built to withstand earthquakes that will happen. It's only a matter of time."
Jacob said he will now focus on upgrading New York State's building code and on "the dilemma not dealt with yet--emergency preparedness." He said that police, fire, hospital, telecommunications, transportation and other officials should prepare plans to deal with the consequences of various earthquake scenarios.
Deploying portable seismometers on several New York City bridges, he and Lamont-Doherty colleagues are also evaluating how the bridges would respond to earthquake-induced shaking and recommending ways to retrofit the bridge to enhance public safety.

Columbia University Record -- March 3, 1995 -- Vol. 20, No. 19 (http://www.columbia.edu/cu/record/archives/vol20/vol20_iss19/record2019.11.html)
Scientist's Earthquake Codes Adopted


(http://www.columbia.edu/cu/record/archives/vol20/vol20_iss19/record2019.12c.gif)

[Domamania]

Great News Folks! The answers from www.wtcprogress.com regarding One World Trade Center are now on there. According to Lynda Tollner, program director in the World Trade Center Construction Department with design and construction responsibilities for One World Trade Center, she projects the Tower will reach between the 55th and 60 Floors by the end of 2010 and it will have a total of 105 Floors. So feel free to examine some of the questions and answers.

so your saying that the freedom tower or world trade tower1 v2 will be the height of tower 7 by december. thats a pretty fast and huge jump. i mean tower 7 is 52 floors heigh so if its true what you said then freedom tower will definatly break into the sky line by then and able to be seen from miles.

[OneWorldTradeCenter]

Yes, I can´t wait!

I posted one question there as well, they answered that the tower will be topped out at 1,776ft by late 2012.

[2-TOWERS]

I Will Be There In December And Caculating That She Will Be Between 50 - 55 Floors And Will Be An Impact In The Skyline......i Will Take Alot Of Pics And Send Them To Nyguy And He Can Post Them For Me......

[NYguy]

Juan Beltran (http://www.flickr.com/photos/21853995@N06/4443832335/sizes/o/)

http://farm3.static.flickr.com/2755/4443832335_30b09b9461_o.jpg

[NYguy]

Fernando Maclen (http://www.flickr.com/photos/puertobaires/4444178729/sizes/l/in/set-72157623524216329/)

http://farm3.static.flickr.com/2689/4444178729_f57f840668_b.jpg


http://farm3.static.flickr.com/2701/4444176567_55aea02107_b.jpg


http://farm5.static.flickr.com/4033/4444175085_c3129a1e36_b.jpg

[Cat 328D LCR]

Pics from 3-18-10

http://i160.photobucket.com/albums/t183/CAT345BL/1%20world%20trade/056.jpg?t=1268995878

Corner node sitting
http://i160.photobucket.com/albums/t183/CAT345BL/1%20world%20trade/058.jpg?t=1268995934

http://i160.photobucket.com/albums/t183/CAT345BL/1%20world%20trade/068.jpg?t=1268996154

http://i160.photobucket.com/albums/t183/CAT345BL/1%20world%20trade/083.jpg?t=1268995982

http://i160.photobucket.com/albums/t183/CAT345BL/1%20world%20trade/095.jpg?t=1268996007

http://i160.photobucket.com/albums/t183/CAT345BL/1%20world%20trade/097.jpg?t=1268996033

http://i160.photobucket.com/albums/t183/CAT345BL/1%20world%20trade/098.jpg?t=1268996073

Sorry its not alot of pics, was in a hurry

[NYguy]

^ That's plenty.


Here's a cam sot from a few minutes ago.

http://www.pbase.com/nyguy/image/122845643/original.jpg

[NYguy]

http://archrecord.construction.com/news/daily/archives/2010/100318spielberg_ground_zero.asp

Steven Spielberg Focuses on Ground Zero

March 18, 2010
By C.J. Hughes

A film legend who’s taken on D-Day, slave revolts, and the Holocaust is aiming his cameras at the site of a solemn modern-day event.

Steven Spielberg is serving as executive producer of Rebuilding Ground Zero, a six-part television documentary about the construction efforts at the former World Trade Center. The show, which began shooting in mid-February in Lower Manhattan, is set to air on the Science Channel in fall 2011, in time for the 10th anniversary of the September 11 attacks.

An entire episode will be dedicated to One World Trade Center, the 1,776-foot office tower by David Childs, FAIA, of Skidmore, Owings & Merrill, which is the first of four planned towers to go up on the 16-acre site; New York’s Port Authority is developing it.

Meanwhile, a transit hub by Santiago Calatrava, FAIA, will be profiled in a separate episode, and the site’s memorial, which was designed by Michael Arad, AIA, will be featured in a third.

The show will also weave in stories about the workers who are actually constructing the new buildings, some of whom also helped to rebuild the original World Trade Center after it was bombed in 1993, according to those involved with the show.

In early February, Spielberg, the award-winning creator of Saving Private Ryan, Amistad and Schindler’s List paid his first visit to the site, where he signed a beam that will end up on the 20th floor of One World Trade, according to Forster. Spielberg was not available for comment.

Rebuilding, which is the first show to be filmed at the site, could generate some sympathy for those tasked with coordinating the construction, says Joe Daniels, president of the National 9/11 Memorial, a not-for-profit fundraising group.

Indeed, after learning about the challenges of building one of the world’s tallest buildings, restoring two city streets and developing a new train station, while not interrupting an active commuter railway, Daniels says, viewers may appreciate “how complex the project really is.”

[iamtal]

I don't know if this was mentioned before, but there are new information from Port Authority (answers for latest surfers questions).

* Curtain wall construction - 3rd quarter of 2010.
* Only two existing tower cranes will be used to built the structure, no more cranes will be added
* By the end of the year, the structure will have 55-60 floors
* Top out - late 2010/early 2013

http://www.panynj.gov/wtcprogress/q_a_intro.cfm

[Puzzlecraft]

Further in the excellent report there's this:

Construction from this point forward will be done with the existing two tower cranes and a sliding crane on the northwest corner of the building.

So there is a third crane.

[Puzzlecraft]

Some metal flooring has appeared at near the southeast corner on the second level of the new two stories of "brown steel". Is the same kind of metal flooring going to be placed on the first level? I'd have thought that the first flooring would be done first.

[wong21fr]

What exactly is a sliding crane?

[FerrariEnzo]

I was under the impression sliding cranes are those large cranes used to unload ships at ports... but that clearly doesn't mesh with this application so I am stumped.

[Cat 328D LCR]

A sliding crane? Like a Container port gantry crane that slides east to west along a track? Someones terms must of gotten mixed up. One of those will not reach to even 3/4 of the height it is at now. Maybe you mean a self erecting tower crane? As sliding you mean it will jump it self up as the building grows?

[Puzzlecraft]

The term "sliding" was a quote from the PA site. A search yields like what you said - those cranes that slide on overhead rails like at container ports or steel mills. Doesn't make sense. I figure something for bringing up smaller items / supplies while the two tower cranes focus the steel.

[NYguy]

Some metal flooring has appeared at near the southeast corner on the second level of the new two stories of "brown steel".
Is the same kind of metal flooring going to be placed on the first level? I'd have thought that the first flooring would be done first.

Here's a look from a couple of minutes ago:

http://www.pbase.com/nyguy/image/122856394/original.jpg

[lakegz]

Just moved out from New York. Of course the two years I lived in NY saw minimal apparent progress on this building and now it decides to really take off. I'll be back in May for my graduation, I hope to see this thing a couple hundred feet higher by then.

[NYCLuver]

March 19th, 2010

http://i802.photobucket.com/albums/yy306/DKNY619/IMG_1222.jpg

[Zensteeldude]

Some metal flooring has appeared at near the southeast corner on the second level of the new two stories of "brown steel". Is the same kind of metal flooring going to be placed on the first level? I'd have thought that the first flooring would be done first.

The decking is placed by hand so it really doesn't matter what floor gets done first. It's corrugated sheet metal relativly light stuff.

http://www.accesskent.com/Health/DHS/images/construction/2008/05-2008_Metal_decking_on_2nd_floor1.jpg

NYCLuver wins this month's "Best steel Porn" pic award !

[NYCLuver]

The decking is placed by hand so it really doesn't matter what floor gets done first. It's corrugated sheet metal relativly light stuff.

http://www.accesskent.com/Health/DHS/images/construction/2008/05-2008_Metal_decking_on_2nd_floor1.jpg

NYCLuver wins this month's "Best steel Porn" pic award !

:cheers:

"I'd like to first start by thanking the Academy..." :jester:

[Zensteeldude]

I'll drink to that !! :cheers:

[Bucktown718]

"Steel Porn" Lol you guy's are funny.

[NYC4Life]

The first building in the new WTC complex to receive XXX Certification :cool:

[Chad Berry]

this wtc is going to look really good in new york

[hammersklavier]

Am I not the only one who is struck by the fact that it looks like the construction methods on this building is something of a throwback? Unlike many other modern skyscrapers, which are almost entirely built of reinforced concrete, it looks like 1 WTC is being built with traditional "internal steel skeleton" methods around a somewhat more-modern core.

Could this be a reaction to the fact that the structural failure in the original complex was due to the easily-melted support lattice trusses in the original tubular tower design?

[Zensteeldude]

The first building in the new WTC complex to receive XXX Certification :cool:

:rolleyes:

[Zensteeldude]

Am I not the only one who is struck by the fact that it looks like the construction methods on this building is something of a throwback? Unlike many other modern skyscrapers, which are almost entirely built of reinforced concrete, it looks like 1 WTC is being built with traditional "internal steel skeleton" methods around a somewhat more-modern core.

Could this be a reaction to the fact that the structural failure in the original complex was due to the easily-melted support lattice trusses in the original tubular tower design?

Nothing melted on 9-11-01 other than the aluminum of the planes. The structure of Tower One is based on sound design from lessons learned about the Twins failures.

It's sounds to me like you know just enough about engineering to be dangerous, or you spent too many hours at those silly 9/11 truther sites..

I'm an NJIT Grad with an MS in Structural Engineering and 20 years experience and a full set of prints for Tower One, and the Memorial, and the Transit Hub, and the ARC Tunnels . . . . .among other things.

[2-TOWERS]

The Next Floors Completed, We Should Start To Notice The Angle

[Zensteeldude]

:previous: Once the third, and last, pick of the corner nodes is in we should really be able to see the angle.

In the next pick the corner nodes we split into 3 columns.

[BStyles]

My three pics from today. (large images)

http://s279.photobucket.com/albums/kk157/BOJAMforeva/CIMG0021-1.jpg
http://s279.photobucket.com/albums/kk157/BOJAMforeva/CIMG0020-1.jpg
http://s279.photobucket.com/albums/kk157/BOJAMforeva/CIMG0018-1.jpg

[Zensteeldude]

MMMMMMMMMMMM, steel porn !!!!

Nice shots BStyles !!!

[2-TOWERS]

amazing pics........................wow !!!!!!!!!!!!!!!!!!!!:)

[Spud]

can you please translate what MPA means, Thank you.

As stated by someone else, MPA is the metric version of PSI. To find out how strong a particular concrete mix can be expected to be they take a sample and find out how much pressure it takes to crush it. We also have hand held devices that can test concrete on site.

I'm not sure of the metric to imperial conversion but a domestic house slab here is usually 17.5mpa, a commercial concrete floor in a high rise is 30mpa, structural beams and columns are 40mpa and a crane base is 50mpa. This is bearing in mind that our buildings are designed to withstand a cataclysmic earthquake (over 8.5 on the richter scale) which can be expected every 150 years or so. (The last one was 150 years ago.)

Fortunately New York does not experience cataclysmic earthquakes. From my rather limited understanding of the engineering design considerations for a super tall high rise such as the freedom tower it is wind loading that is the main concern. I think someone else mentioned that in some cases the wind could be expected to cause some of the columns to be in tension which is quite an alarming thought when you consider what must be happening to the columns on the other side of the building!

At any rate, I hope one day to visit this amazing structure.

[Spud]

Am I not the only one who is struck by the fact that it looks like the construction methods on this building is something of a throwback? Unlike many other modern skyscrapers, which are almost entirely built of reinforced concrete, it looks like 1 WTC is being built with traditional "internal steel skeleton" methods around a somewhat more-modern core.



The corner columns are beautifully angled inwards so as, I presume, to help brace the structure. This looks rather sophisticated to me.

Perhaps the choice of steel could have something to do with economics. In my city the price of structural steel went through the roof a few years back so a lot of buildings have been built out of concrete recently. Maybe the inverse applies in New York? Does anyone here know why they chose steel over concrete?

[canadate]

Thanks for the compliments the other day, they're always appreciated. I have those photos I promised that day too. I said it'd be within the next month but I felt up to it yesterday and decided to knock it out. Here they go..

http://i973.photobucket.com/albums/ae212/canadate/DSCF5018.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5026.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5029.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5037.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5045.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5057-1.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5058.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5060-1.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5067.jpg
There goes my shot looking vertical between the Verizon and Tower 1...Won't see that for a long time.

http://i973.photobucket.com/albums/ae212/canadate/DSCF5068.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5070.jpg
New Gate

http://i973.photobucket.com/albums/ae212/canadate/DSCF5074.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5078.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5094.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5117.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5125-1.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5127.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5130.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5131.jpg

http://i973.photobucket.com/albums/ae212/canadate/DSCF5139.jpg

[BiggieSmalls]

and a full set of prints for Tower One, and the Memorial, and the Transit Hub, and the ARC Tunnels . . . . .among other things.

The ARC Tunnels..? Is there a thread on that? That has to be one of the great under the radar projects.. \

[NYguy]

^ It's only under the radar because the focus has been on the Moynihan Station development. There should be more info in the transit forum. There were some updates in the old Moynihan thread though.


http://i973.photobucket.com/albums/ae212/canadate/DSCF5045.jpg


http://i973.photobucket.com/albums/ae212/canadate/DSCF5125-1.jpg


Great shots. I can already feel 7 WTC becoming eclipsed.

[canadate]

Great shots. I can already feel 7 WTC becoming eclipsed.

Thanks a lot! And yeah, I think about that a lot but for some reason it's hard to believe. 7 already seems tall..This tower is going to be more than twice the height! Can't wait till 1 passes it!

[Indescribable]

Is the lobby of 7WTC always lit up like that?

[evanmack]

Is the lobby of 7WTC always lit up like that?

Yes it is, most of the time at least...

[MadGnome]

It looks like they're laying 22 before 21. Is that how they're going to do the floor a week trick? Just lay even number floors to start and follow up with the odd floors?

[uaarkson]

It looks like they're laying 22 before 21. Is that how they're going to do the floor a week trick? Just lay even number floors to start and follow up with the odd floors?

wat

[BStyles]

No, you lower steel and decking onto the floor and place decking last for the even numbered floors. As you can see, the 20th floor is currently getting decking.

They completed two floors in one week?! Wow!

[uaarkson]

It's been almost two weeks since they started putting up new core steel, but considering they didn't hang steel for the better half of last week as a result of rain, you could say the speed has been very good.

[meh_cd]

Either way, we've already done the hard part. Now the farther we go up, the smaller the floor plates. However, that also means the cranes will take more time to deliver the material for each floor. I wouldn't say we're in the home stretch quite yet, but if we reach the 50th floor by the end of this year I'll be more than pleased.

[NYguy]

They completed two floors in one week?! Wow!

They should be completed by the end of next week, so that would feed in to the average of about a floor a week. We're watching the office floors rise now, so other than the tapered effect of the tower, the biggest visual difference in construction will come when we reach the crown, followed by the spire.

[Zensteeldude]

It looks like they're laying 22 before 21. Is that how they're going to do the floor a week trick? Just lay even number floors to start and follow up with the odd floors?

The sooner they get the 22nd floor decked out the sooner they can start on the next lift.

[OneWorldTradeCenter]

Hi guys. I have a question:

Which tower weighs more? This one (when complete) or the North Tower???

[2-TOWERS]

I Would Think This Tower Will Because The Original Tower Had 3 Sheets Of Sheetrock To Protect The Core Where This New One Trade Has The Concrete, And Steel Cross Beams Conecting The Floor Plates , Not The Lightweight Truss Design........ Ny Guy Or Zen Would Have A More Accuate Answer For You..

[hammersklavier]

Nothing melted on 9-11-01 other than the aluminum of the planes. The structure of Tower One is based on sound design from lessons learned about the Twins failures.

It's sounds to me like you know just enough about engineering to be dangerous, or you spent too many hours at those silly 9/11 truther sites..

I'm an NJIT Grad with an MS in Structural Engineering and 20 years experience and a full set of prints for Tower One, and the Memorial, and the Transit Hub, and the ARC Tunnels . . . . .among other things.
Not to nitpick, but that's the official story--per the History Channel. The fireball when the jets hit the towers would have been more than hot enough to melt pretty much all common building materials, and I do know that the lattice structures used in the original buildings' tubes were designed to be much lighter (and more fragile, in the sense that the stability of the whole depends on the stability of all its parts and that the failure of only a few parts leads to the failure of the whole thing).

Also I am affronted, dear sir, that you would suggest that I spend time on websites like that! Honestly, the gaping holes in their logic...

[uaarkson]

Nope

No

Absolutely Not

None Of That

[eaalkaline]

It's deceiving to say that the steel melting. The intense heat from the explosion (and mostly the jet fuel-fed fire that followed it) was able to weaken the steel, but the structure failed long before any actual melting took place.

[2-TOWERS]

Enough Said....this Is Not The Thread To Be Talking About Melting Steel Etc.... We Got A Masterpiece Being Built Right Now ...lets Enjoy This Building Rise......

[Loslocos]

Enough Said....this Is Not The Thread To Be Talking About Melting Steel Etc.... We Got A Masterpiece Being Built Right Now ...lets Enjoy This Building Rise......

Amen to that! :yes:

[uaarkson]

Damn, can we get ONE monday without rain? :no:

[RockMont]

No, afraid not. It's springtime in New York City.

[NYguy]

this Is Not The Thread To Be Talking About Melting Steel Etc....

Right. Leave that to another thread. We're talking about a tower going up, not coming down.


Paolo Mastrangelo (http://www.flickr.com/photos/paolomastrangelo/sets/72157623668168142/)

http://farm5.static.flickr.com/4050/4452530275_eb64acede8_o.jpg


http://farm5.static.flickr.com/4027/4451129253_2c307cf18b_o.jpg


http://farm5.static.flickr.com/4046/4453304180_c1e71acd41_b.jpg


http://farm3.static.flickr.com/2691/4452527869_98870b6f51_b.jpg

[FerrariEnzo]

Wow the whole site is getting frenetic.

[Deepstar]

It's great to see this one making some height!

[Zensteeldude]

Hi guys. I have a question:

Which tower weighs more? This one (when complete) or the North Tower???

The new Tower One well weigh considerably more, despite having 1.4 million square feet less office space. Not all of the extra weight is in the core and floor framing, though much of it is.

The First Tower One was air conditioned from a central chiller plant located under ground. The New Tower well have it's own plant. Add to that about 8 backup generators and about a dozen water tanks distributed through out the building.

[Domamania]

The new Tower One well weigh considerably more, despite having 1.4 million square feet less office space. Not all of the extra weight is in the core and floor framing, though much of it is.

The First Tower One was air conditioned from a central chiller plant located under ground. The New Tower well have it's own plant. Add to that about 8 backup generators and about a dozen water tanks distributed through out the building.

what purpose will the water tanks do for tower 1v2?

[Zensteeldude]

Right. Leave that to another thread. We're talking about a tower going up, not coming down.

You are all absolutely right, this is not the place for such talk.

It's kinda my fault, hammersklavier was just responding to my post.

My apology's, hammersklavier and to all of you.

Remember the past, live in the present, build the future.

[Zensteeldude]

what purpose will the water tanks do for tower 1v2?

They well serve the same purpose that water tanks do in all buildings in New York, ensure that there is water pressure. There is not enough pressure in the water tunnels to lift it all the way to the top so it must be pumped into tanks within or on top of the building.

The First Tower One had such tanks but there were fewer of them.

[Calgarian]

Sorry to keep talking about the twins, but is any of the steel being used in this tower?

[NYguy]

Sorry to keep talking about the twins, but is any of the steel being used in this tower?

NO


The New Tower well have it's own plant. Add to that about 8 backup generators and about a dozen water tanks distributed through out the building.

I remember when it was decided not to use a central plant like the old complex. As I recall, it had something to do with the Hudson River fish. It also led to the office towers being designed a little higher.