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  2. Survivors' Staircase - Wikipedia

    en.wikipedia.org/wiki/Survivors'_Staircase

    The Survivors' Staircase is a granite and concrete staircase that was the last visible remaining original structure above ground level at the World Trade Center site. It was originally an outdoor flight of stairs and two escalators, which connected Vesey Street to the World Trade Center's Austin J. Tobin Plaza.

  3. Air raid shelter - Wikipedia

    en.wikipedia.org/wiki/Air_raid_shelter

    Hochbunker usually consisted of large concrete blocks above ground with walls between 1 and 1.5 metres (3 ft 3 in and 4 ft 11 in) thick and with huge lintels above doorways and openings. They often had a constant interior temperature of 7 to 10 °C (45 to 50 °F), which made them perfectly suitable for laboratories, both during and after the war.

  4. Scaffolding - Wikipedia

    en.wikipedia.org/wiki/Scaffolding

    The diagram above also shows a kicker lift, which is just 150 mm or so above the ground. Transom spacing is determined by the thickness of the boards supported, 38 mm boards require a transom spacing of no more than 1.2 m while a 50 mm board can stand a transom spacing of 2.6 m and 63 mm boards can have a maximum span of 3.25 m.

  5. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    The CN Tower's staircase reaches the main deck level after 1,776 steps and the Sky Pod above after 2,579 steps; it is the tallest metal staircase on Earth. The Gemonian stairs were infamous as a place of execution during the early Roman Empire, especially during the period postdating Tiberius. [53]

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Airstair - Wikipedia

    en.wikipedia.org/wiki/Airstair

    An airstair is a set of steps built into an aircraft so that passengers may board and alight the aircraft. The stairs are often built into a clamshell-style door on the aircraft. Airstairs eliminate the need for passengers to use a mobile stairway or jetway to board or exit the aircraft, providing more independence from ground services.

  8. Caisson (engineering) - Wikipedia

    en.wikipedia.org/wiki/Caisson_(engineering)

    Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.

  9. NC concrete factory to close after 29 years. Owners blame ...

    www.aol.com/nc-concrete-factory-close-29...

    The rise of remote work, higher interest rates and a decline in multifamily construction also played a role in the Granville County closing, the company said. NC concrete factory to close after 29 ...

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