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  2. Stair tread - Wikipedia

    en.wikipedia.org/wiki/Stair_tread

    A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]

  3. Concrete bridge - Wikipedia

    en.wikipedia.org/wiki/Concrete_bridge

    The longest steel reinforced bridge, in 2024, is the 600 metres (2,000 ft) Tian'e Longtan Bridge, Guangxi Zhuang, China. [8] The US's longest unreinforced concrete span, is the 200 feet (61 m) arch of the, 1910, Rocky River Bridge in Cleveland, Ohio. [9] Early extant examples include:

  4. Movable scaffolding system - Wikipedia

    en.wikipedia.org/wiki/Movable_scaffolding_system

    A movable scaffolding system (MSS) is a special-purpose self-launching form used in bridge construction, specifically prestressed concrete bridges with segments or spans that are cast in place. The movable scaffolding system is used to support a form while the concrete is cured; once the segment is complete, the scaffold and forms are moved to ...

  5. 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.

  6. Masonry bridge - Wikipedia

    en.wikipedia.org/wiki/Masonry_bridge

    By doubling the size of the arch, Paul Séjourné paved the way for the construction of large reinforced concrete arch bridges. The arrival of new construction techniques using steel, such as suspension bridges, prestressed concrete bridges, or cable-stayed bridges, abruptly marked the end of masonry bridge construction in the Western world.

  7. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    Riser-Tread formula: Sometimes the stair parameters will be something like riser plus tread equals 17–18 inches (432–457 mm); [38] another formula is 2 times riser + tread equals 24.6 inches (625 mm), the length of a stride. [14] Thus a 7 inches (178 mm) rise and a 10.6 inches (269 mm) tread exactly meets this code.

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