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  2. Yerba Buena Tunnel - Wikipedia

    en.wikipedia.org/wiki/Yerba_Buena_Tunnel

    After the two halves were fastened together, a steel form was used to close the 1-foot-6-inch-wide (0.46 m) gap between halves, and concrete was poured in the gap. [26] The upper deck rests on 12-inch-wide (30 cm) shoulders built into the tunnel wall, padded by 1 ⁄ 2-inch-thick (1.3 cm) Masonite. [14]

  3. Formwork - Wikipedia

    en.wikipedia.org/wiki/Formwork

    In the illustration of the column formwork above, the 'column clamps' are closer together at the bottom. Note that the column is braced with steel adjustable 'formwork props' and uses 20 mm 'through bolts' to further support the long side of the column. Some models of "permanent formwork" also can serve as extra reinforcement of the structure.

  4. Framing (construction) - Wikipedia

    en.wikipedia.org/wiki/Framing_(construction)

    Studs usually consist of 1 + 1 ⁄ 2-by-3 + 1 ⁄ 2-inch (38 mm × 89 mm) or 1 + 1 ⁄ 2-by-5 + 1 ⁄ 2-inch (38 mm × 140 mm) lumber and are commonly spaced at 16 inches (410 mm) on center. This spacing may be changed to 12 or 24 inches (300 or 610 mm) on center depending on the load and the limitations imposed by the type and thickness of the ...

  5. Lumber - Wikipedia

    en.wikipedia.org/wiki/Lumber

    Re-sawing is the splitting of 1-to-12-inch ... Plastic fiberglass structural lumber can have a "class 1 ... Supporting post columns by concrete piers so that there is ...

  6. Glass fiber reinforced concrete - Wikipedia

    en.wikipedia.org/wiki/Glass_fiber_reinforced...

    GRC (Glass fibre-reinforced concrete) ceramic consists of high-strength, alkali-resistant glass fibre embedded in a concrete & ceramic matrix. [1] In this form, both fibres and matrix retain their physical and chemical identities, while offering a synergistic combination of properties that cannot be achieved with either of the components acting alone.

  7. Rebar - Wikipedia

    en.wikipedia.org/wiki/Rebar

    The diameter of the equivalent large format round shape is rounded to the nearest 1 ⁄ 8 inch to provide the bar size. For example, #9 bar has a cross section of 1.00 square inch (6.5 cm 2), and therefore a diameter of 1.128 inches (28.7 mm). #10, #11, #14, and #18 sizes correspond to 1 1 ⁄ 8 inch, 1 1 ⁄ 4, 1 1 ⁄ 2, and 2-inch square ...

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