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Thread: Tallest free-standing structure on land in the world

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    Senior Member Array mrina's Avatar
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    Tallest free-standing structure on land in the world

    Tallest free-standing structure on land in the world

    The CN Tower, located in downtown Toronto, Ontario, Canada, is a communications and observation tower standing 1,815 ft. 5 inches (553.34 m) tall. It surpassed the height of the Ostankino Tower while still under construction in 1975, becoming the tallest free-standing structure on land in the world. On September 12, 2007, after holding the record for 31 years, the CN Tower was surpassed in height by the still-under-construction Burj Dubai. It remains the tallest free-standing structure in the Americas and the signature icon of Toronto's skyline, attracting more than two million international visitors annually.
    Despite the loss of its title as the world's tallest freestanding structure, the CN Tower remains a symbol of Canada in a similar manner as the Empire State Building remains a symbol of the United States.


     



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    Senior Member Array mrina's Avatar
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    The CN Tower was the world's tallest free-standing structure on land from 1975 until 2007.

    The CN Tower as seen from its base

    A bolt of lightning strikes the CN Tower. The CN Tower is struck by lightning at least 40 to 50 times annually compared to other places in Toronto which are struck, on average, 2 times per square kilometre (5 times per sq mi) every year.

    Inside the 360 Restaurant in the CN Tower

    Safety features

    In August 2000, a fire broke out at the Ostankino Tower in Moscow, killing several people and causing extensive damage. The fire was blamed on poor maintenance and outdated equipment. The failure of the fire-suppression systems and the lack of proper equipment for firefighters allowed the fire to destroy most of the interior and spark fears the tower might even collapse.

    The Ostankino Tower was completed only 9 years before the CN Tower and is only 13 metres shorter. The two towers also hold the same prodigious level of national pride in their respective countries. The parallels between the towers led to some concern that the CN Tower could be at risk of a similar tragedy. However, Canadian officials subsequently stated that it is "highly unlikely" that a similar disaster could occur at the CN Tower as it has important safeguards that were not present in the Ostankino Tower. Specifically, officials cited:

    * the fireproof building materials used in the tower's construction,
    * frequent and stringent safety inspections,
    * an extensive sprinkler system,
    * a 24-hour emergency monitoring operation,
    * two 15,000-imperial gallon water reservoirs at the top, which are automatically replenished,
    * a fire hose at the base of the structure capable of sending 600 imperial gallons a minute to any location in the tower,
    * a ban on gas appliances anywhere in the tower,
    * an elevator that can be used during a fire as it runs up the outside of the building and can be powered by three emergency generators at the base of the structure (unlike the elevator at the Ostankino tower, which seriously malfunctioned.

    Officials also noted that the CN Tower has an excellent safety record and that there has never been an accidental fire in the tower since it was opened in 1976. Moreover, other supertall structures built between 1967–1976, such as the Sears Tower, the World Trade Center (until its destruction on September 11, 2001), the Berliner Fernsehturm, the Aon Center, the John Hancock Center and First Canadian Place also have excellent safety records, which suggests that the Ostankino Tower accident was a rare safety failure and the likelihood of similar events occurring at other supertall structures is extremely low.
    Lighting

    The CN Tower was once lit at night with incandescent lights, but they were removed in 1997 because they were expensive and inefficient to repair. In June 2007, the tower was outfitted with 1,330 super-bright LED lights inside the elevator shafts, shooting up over the "bubble" and upward to the top of the tower's mast to light the tower from dusk until 2 a.m. The official opening ceremony took place on June 28 before the Canada Day holiday weekend. The tower changes its lighting scheme accordingly to holidays and major events. After the 95th Grey Cup in Toronto, the tower was lit up in green and white to represent the colours of the Grey Cup champion Saskatchewan Roughriders.

    Programmed from a desktop computer with a wireless network interface card, the LEDs use less energy to light than the previously used incandescent lights (10% less energy than the dimly lit version and 60% less than the brightly lit version). The estimated cost to use the LEDs is $1,000 per month.

    During the spring and autumn bird migration seasons, the lights will be turned off to comply with the voluntary Fatal Light Awareness Program, which "encourages buildings to dim unnecessary exterior lighting to mitigate bird mortality during spring and summer migration.

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    Senior Member Array sunnyajmal's Avatar
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    wowwwwwwwww... beautiful...

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    Member Array jojo_patty's Avatar
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    Awesome...Would love to go there.

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    beauti ful pictures

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    Its in ontario But now Burj Dubai is the longest free standing structure................

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    yea sol i was about to say that.....it was the longest one..not anymore....

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