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  2. Playground surfacing - Wikipedia

    en.wikipedia.org/wiki/Playground_surfacing

    Poured rubber surfacing: This is a seamless rubber surface composed of two layers that is poured in place (PIP). The first layer, or "wear layer", is typically 3 ⁄ 8 inch (9.5 mm) thick and made of EPDM or TPV granules. The second layer, or "cushion layer", is 1–5 inches (25–127 mm) thick and made of crumb rubber or recycled rubber tires.

  3. Crumb rubber - Wikipedia

    en.wikipedia.org/wiki/Crumb_rubber

    Rubberized asphalt is the largest market for crumb rubber in the United States, consuming an estimated 220 million pounds (100 kt), or approximately 12 million tires annually. [2] Crumb rubber is also used as ground cover under playground equipment, and as a surface material for running tracks and athletic fields. [2]

  4. Home Depot - Wikipedia

    en.wikipedia.org/wiki/Home_Depot

    This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. American multinational home improvement supplies retailing company The Home Depot, Inc. A Home Depot in Onalaska, Wisconsin Company type Public Traded as NYSE: HD DJIA component S&P 100 component S&P 500 component Industry Retail (home improvement) Founded February 6, 1978 ; 47 years ...

  5. Running track - Wikipedia

    en.wikipedia.org/wiki/Running_track

    The proper length of the first lane of a competitive running track is 400 m (1,312.3 ft). Some tracks are not built to this specification, instead being a legacy to imperial distances such as 440 yd (402.336 m), equivalent to a quarter of a mile.

  6. Caisson (engineering) - Wikipedia

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

    To install a caisson in place, it is brought down through soft mud until a suitable foundation material is encountered. While bedrock is preferred, a stable, hard mud is sometimes used when bedrock is too deep. The four main types of caisson are box caisson, open caisson, pneumatic caisson and monolithic caisson. [5]

  7. Starting blocks - Wikipedia

    en.wikipedia.org/wiki/Starting_blocks

    Pressure-sensitive starting blocks with loudspeakers. A pressure sensor will detect an early start and the loudspeakers provide the runners with the sound from the starter all at the same time.

  8. Bearing capacity - Wikipedia

    en.wikipedia.org/wiki/Bearing_capacity

    A general bearing failure occurs when the load on the footing causes large movement of the soil on a shear failure surface which extends away from the footing and up to the soil surface. Calculation of the capacity of the footing in general bearing is based on the size of the footing and the soil properties.

  9. I-beam - Wikipedia

    en.wikipedia.org/wiki/I-beam

    A typical cross-section of I-beams. There are two standard I-beam forms: Rolled I-beam, formed by hot rolling, cold rolling or extrusion, depending on the material.; Plate girder, formed by welding (or occasionally bolting or riveting) plates.