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Thread: 7 World Trade Center - by Skidmore, Owings and Merrill

  1. #136

    Default 7 WTC renderings

    It's a parallelogram. There are two widths.

  2. #137

    Default 7 WTC renderings

    And from certain angles it can look very fat.

  3. #138

    Default 7 WTC renderings

    The portion above ground facing north is in fact the substation, and a small one at that. The site is split, and foundations are still being laid to the south. It will be some time until the other half of the building rises, and more time for the connection to be made to steel above the station. For all the hype 7 WTC will not be rising all that soon.

  4. #139

    Default 7 WTC renderings

    Construction photos May 18, 2003

    south on Greenwich


    Greenwich & Barclay


    west on Barclay


    Vesey & (in a few years) Greenwich




    Original 7WTC had 2 substations. It appears they are pouring
    foundation on Vesey for a structure similar to Barclay.
    Substation(s) to rise to 115 ft.

  5. #140
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    Default 7 WTC renderings

    Maybe I'm crazy, but wasn't there already a 2 story concrete structure in place?

  6. #141
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    Default 7 WTC renderings

    Well if you are, I am too. Either way, I am very excited about this building...is there an estimation of when it will be completed?

  7. #142
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    Default 7 WTC renderings

    The first substation was meant to be finished by this summer, to accomodate the AC needs of the Financial District. *But if the pace is going to be this slow the whole time, I'm somewhat doubtful that it'll be online in time.

    The tower is supposed to be finished by 2007.

  8. #143

    Default 7 WTC renderings

    Meanwhile, Silverstein still battles it out with his insurers!

  9. #144

    Default 7 WTC renderings

    I cant belive how long its taking to get started! and the rest of the trade centre, apparentley is going to take ages. Its such a slap in the face!

  10. #145

    Default 7 WTC renderings

    Construction progress of the new 7 WTC on 28 June 2003.





    Construction progress of the new 7 WTC on 28 June 2003.





    Construction progress of the new 7 WTC on 28 June 2003.


  11. #146
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    Default 7 WTC renderings

    Hasn't moved at all.

  12. #147
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    Default 7 WTC renderings

    There's so much going down down there (In that "Ground Zero" area), that it's hard to tell.

  13. #148

    Default 7 WTC renderings

    July 13, 2003

    Building Being Reborn Using Part of Old Foundation

    By JOHN HOLUSHA


    The foundation work at 7 World Trade Center.

    While discussions continue on how to redevelop the Twin Towers site of the former World Trade Center, construction already is under way to rebuild the adjacent 7 World Trade Center, a building that collapsed in fires touched off by the Sept. 11 attack. Supported in part by elements of the foundation of the destroyed structure, it is the first building at Ground Zero to be rebuilt.

    But it will not be the same building. Changing tastes in urban design that favor a normal street grid over streetless superblocks have led to plans to reopen Greenwich Street, which was blocked by the original structure. So the footprint has moved to the west and somewhat to the south of the previous location.

    In the new design, the main entrance to the building will face east on the newly reopened Greenwich Street. Where a vehicular ramp that formerly led into the main Trade Center complex and a corner of the previous building once stood, a 15,000-square-foot triangular park is to face the entrance from across Greenwich Street.

    At 52 stories, the new building will be five stories taller than its predecessor and more slender, because the building site has been reduced. The $700 million project paid for largely with insurance settlements will have 1.7 million square feet of space, compared with 2 million square feet in the old building. Like the old 7 World Trade Center, the commercial office building will sit on top of a Con Ed electrical substation, which will take up the equivalent of the first 10 floors of the structure. And it will sit, at least partially, on foundation elements that are in their second or third use, having supported the substation, the previous building or both.

    Although the intense heat of fire weakened the building and caused the collapse, the effect did not extend very far underground. Once the rubble was cleared away, engineers checked the old footings of the substation and building and found them to be in good condition.

    "Our conclusion was that the building came down so slowly that it did not destroy what was in the base," said George Tamaro, a senior partner in Mueser Rutledge Consulting Engineers, a consultant about the underpinning of the project.

    But because of the changed footprint, new foundation elements were needed, with the new carefully blended with the old to support the building and enable it to resist the effects of wind and earth movements. Using the old foundations was an important part of the project, said Jack Klein, a vice president of Silverstein Development, a division of Silverstein Properties, the developer.

    "It's a necessity really," he said. "As a practical matter, you can't pull them out."

    The work was complicated by the fact the new building will have a basement, unlike the old one, which was built on a slab. The land is owned by the Port Authority of New York and New Jersey.

    The foundations, known as caissons, are used to support tall buildings by anchoring them to solid rock. To form them, a hollow steel tube is drilled down through loose upper soil until it hits a layer of rock capable of supporting the structure.

    Then a hole is drilled into the rock as much as 25 feet deeper and a steel beam is inserted through the tube and into the rock to pin the caisson in place. Then the tube is filled with concrete and capped to support the major columns of the building.

    Some caissons are driven in at an angle battered, in architectural terms to help resist the tipping effect of winds on the building and to control movement in an earthquake. The effect of winds in the narrow corridors of Lower Manhattan is sufficiently complicated that designers built a model of the structure and tested it in a wind tunnel. "We need to hold the building up and hold it down," Mr. Klein said.

    Ultimately, the engineers were able to use 55 existing caissons, some from the previous office building and some from the Con Ed substations. In addition, 92 new ones were added to provide adequate support.

    A complicated series of transfer beams was needed to match the loads of the new building to caissons installed for previous structures, said Silvian Marcus, executive vice president of Cantor Seinuk Group, the structural engineer for both the original office building and the current project. "In some cases, the cost of the transfer beams and straps was so high that caissons had to be abandoned," he said.

    The new building is outside the boundaries of the original island of Manhattan, whose Hudson River shoreline roughly followed Greenwich Street, Mr. Tamaro said.

    Adding the new caissons meant drilling into an area already crowded with utility lines and subways. Indeed, the No. 1 and 9 subway line actually runs under to footprint of the old building; it will be adjacent to the new one. "The biggest risk in construction is what you find in the ground," Mr. Klein said.

    In addition, the new building extends 22 feet south of the original structure and that much closer to the slurry wall that keeps the Hudson River out of the pit that remains where the Twin Towers stood, Mr. Tamaro said. Some of the new caissons interfered with the tiebacks supporting the slurry wall, which had to be moved.

    Mr. Klein said that builders typically try to do a historical search on sites, but that documentation of old construction projects is often hard to find. In spite of the difficulties, all the caissons have been installed and the building is rising on top of them.

    THE foundation for the project is particularly critical because the new 7 World Trade Center will be more substantial than the one it replaces, with a hardened structure intended to increase safety and resist collapse. In addition, the heavy transformer in the electrical substation adds to the load on the foundation.

    The new building with have a core the central structure containing the elevators, stairwells and risers for utilities made of reinforced concrete the full height of the building, instead of the lighter steel framework covered with wallboard as had often been the practice in the past.

    This core will have two stairwells separated by about 110 feet to minimize the likelihood that both would be blocked by the same incident. They will also be pressurized to keep smoke out in case of a fire. The features were added, presumably to assure prospective tenants about the building's safety, even though the older building was evacuated on Sept. 11 with no fatalities.

    The fuel tanks for the emergency electrical generators will be underground and outside the structure's footprint, in contrast to fuel tanks in the old building on the fifth, seventh and eighth floors, which may have fed the fires that brought it down.

    The reinforced core also has a structural value, engineers say, because it stiffens the building against swaying or twisting in the wind. The previous building required steel cross bracing on the upper floors to minimize movement.

    The Con Ed substation will occupy the north and south sides of the building, with a 45-foot stone and glass lobby in between. The truck entrance will be on the west side, on Washington Street, and will be equipped with a loading dock and seven truck bays.

    Because the substation floors have higher ceilings than a typical office building, the first office floor for tenants will start on the equivalent of the 10th floor.

    Dealing with existing foundations will only become more complicated as sites are redeveloped in Manhattan, Mr. Tamaro said. "Many sites will be so crowded that it will be impossible to install a new foundation," he said. "The prudent thing will be to use the existing foundation with any new foundation that is necessary." *


    Copyright 2003 The New York Times Company

  14. #149

    Default 7 WTC renderings

    Very informative article. Now we know why it's taking so long to rise.

  15. #150

    Default 7 WTC renderings

    Quote: from ZippyTheChimp on 2:01 pm on July 12, 2003
    Very informative article. Now we know why it's taking so long to rise.
    The article mentioned that a lot of work had to be done to the foundation, installing new caissons, and that the construction had to be done around utilities and the 1 and 9 subway lines. *Also, since Silverstein has no anchor tenants, he is probably in no rush to have the building completed.

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