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Thread: Holland Tunnel

  1. #1
    NYC Aficionado from Oz Merry's Avatar
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    Default Holland Tunnel

    What Is That? The Towers In the Middle Of The Hudson

    By Garth Johnston



    http://www.flickr.com/photos/3004647...n/photostream/



    http://www.flickr.com/photos/lemoncat1/2223270017/

    The city of New York is filled with mysteries that, when you know what they mean, can really help make a person feel like a real New Yorker. For example? We've been asked a few times over the years what exactly those odd rampart-like towers in the middle of the Hudson River off lower Manhattan are. The answer? Oh, nothing much. Just a feat of engineering that no less than Thomas Edison once thought was impossible.


    The way the vents work (ASME).

    So what are they? Ventilation shafts! Next time you are walking down the Hudson River Greenway, look closer. Not only are there two matching towers in the water, but there are also two more towers on land (one in Manhattan and one in New Jersey). Those four towers together keep car drivers in the Holland Tunnel from asphyxiating on carbon monoxide. In total the four buildings house 84 fans—42 blowing and 42 sucking—which are capable, at full speed, of completely changing the tunnel's air every 90 seconds [PDF]. See, when the Holland Tunnel was the first conceived its length of 1.6 miles made it the longest automobile tunnel ever. And considering how much worse car exhaust was then, people weren't really sure how to keep the air under the hudson clean enough that it didn't just become a giant suicide pit. The solution, transverse-flow ventilation, came from engineer Ole Singstad (who replaced original designer Clifford Milburn Holland). But it had skeptics! So to prove it would work Singstad, with help from Yale and the U. S. Bureau of Mines, put a bunch of students into cars with engines roaring in a custom 400' test tunnel in a Pennsylvania mineshaft. They lived—and so we got those towers! Here's how they work:

    In the Holland Tunnel’s transverse-flow system, fresh air is drawn from the outside through one of four ventilation buildings and blown by fans into a fresh air duct located under each tunnel roadway. The air enters the tunnel proper through narrow slots just above the curb, spaced 10 to 15 feet (3 to 4.5 m) apart. Exhaust fans (also located in the ventilation buildings) pull the exhaust-laden air through openings in the ceiling into an exhaust duct located above the ceiling slab, and discharges it into the open air through the roof of one of the ventilation buildings.


    http://gothamist.com/2012/04/04/what_is_that_the_towers_in_the_midd.php



    Holland Tunnel entrance


    Holland Tunnel land ventilation shaft

    (both pics from Wikipedia)


    Holland Tunnel wiki

    Bridges and Tunnels website

    NYC Roads website

    Large image of ventilation shaft on Museum Planet website

  2. #2
    NYC Aficionado from Oz Merry's Avatar
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    New Plaza Brings Needed Public Space to Holland Tunnel Entrance

    by Nicole Anderson


    Freeman Plaza West (Courtesy of Ryan Muir/Hudson Square Connection)

    The entrance to the Holland Tunnel, a maze of traffic and complicated pedestrian crossings, finally has some much-needed open space. Thursday, the Hudson Square Connection, the Business Improvement District (BID) for the area, along with the Port Authority of New York & New Jersey, announced the opening of Freeman Plaza West, a new public space outfitted with bistro-style tables and chairs, umbrellas, and greenery, including four trees planted in honor of four members of Port Authority Police Department’s Holland Tunnel Command who lost their lives in the line of duty on September 11th 2001.


    Freeman Plaza West (Courtesy of Ryan Muir/Hudson Square Connection)

    After securing a 5-year lease (with renewal options) for the plaza from the Port Authority, the Connection spent $200,000 on transforming the closed space into a gathering area for the residents and for the more than 50,000 people working in Hudson Square.

    “The Hudson Square neighborhood is a creative hub in the city and is really starved for open space,” said Ellen Baer, president of the Hudson Square Connection.

    Freeman Plaza West is one of several public spaces that will be unveiled within the next few years. Last fall, the Connection launched its five-year plan to update and enliven the public realm with substantial improvements to Soho Square and Spring, Varick, and Hudson Streets. This $27 million plan will include a variety of enhancements from planting beds and pocket gardens to curbside seating and widened sidewalks. The Connection has also tapped Mathews Nielsen Landscape Architects to help with the landscape design program.

    “If this works, we may do a few other temporary spaces,” said Baer. “We have no shortage of ideas.”


    Freeman Plaza West (Courtesy of Ryan Muir/Hudson Square Connection)

    http://blog.archpaper.com/wordpress/archives/61972

  3. #3
    Disgruntled Optimist lofter1's Avatar
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    Silk purse and a sow's ear. Some of the worst concentrations of particulate matter in the city swim in the air around that tunnel entry.

    One might ask if it isn't irresponsible of the BID to doll up this pocket of pollution and encourage folks to hang out there.

  4. #4
    In the long run... londonlawyer's Avatar
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    Quote Originally Posted by Merry View Post
    New Plaza Brings Needed Public Space to Holland Tunnel Entrance

    by Nicole Anderson


    Freeman Plaza West (Courtesy of Ryan Muir/Hudson Square Connection)

    The entrance to the Holland Tunnel, a maze of traffic and complicated pedestrian crossings, finally has some much-needed open space. Thursday, the Hudson Square Connection, the Business Improvement District (BID) for the area, along with the Port Authority of New York & New Jersey, announced the opening of Freeman Plaza West, a new public space outfitted with bistro-style tables and chairs, umbrellas, and greenery, including four trees planted in honor of four members of Port Authority Police Department’s Holland Tunnel Command who lost their lives in the line of duty on September 11th on transforming the closed space into a gathering area for the residents and for the more than 50,000 people
    They should separate the outer perimeter of the park from the roadway with a thick, double row of trees.

  5. #5
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    Quote Originally Posted by londonlawyer View Post
    They should separate the outer perimeter of the park from the roadway with a thick, double row of trees.
    Ahhh yes, a mugger's hedge

  6. #6
    Chief Antagonist Ninjahedge's Avatar
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    Quote Originally Posted by GordonGecko View Post
    Ahhh yes, a mugger's hedge
    What?

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