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  2. Door breaching - Wikipedia

    en.wikipedia.org/wiki/Door_breaching

    A U.S. Marine performs a ballistic breach of a padlocked door using a combat shotgun. Door breaching is a process used by military, police, or emergency services to force open closed or locked doors. A wide range of methods are available depending on the door's opening direction (inward or outward), construction materials, etc., and one or more ...

  3. Penetrant (mechanical, electrical, or structural) - Wikipedia

    en.wikipedia.org/wiki/Penetrant_(mechanical...

    Penetrants, or penetrating items, are the mechanical, electrical or structural items that pass through an opening in a wall or floor, such as pipes, electrical conduits, ducting, electrical cables and cable trays, or structural steel beams and columns. When these items pierce a wall or floor assembly, they create a space between the penetrant ...

  4. Controlled Impact Rescue Tool - Wikipedia

    en.wikipedia.org/wiki/Controlled_Impact_Rescue_Tool

    Controlled Impact Rescue Tool, or CIRT, is a concrete breaching tool produced by Raytheon, that is capable of providing Urban Search & Rescue (USAR) teams with the ability to penetrate a reinforced concrete wall up to four times faster than traditional methods.

  5. Scabbling - Wikipedia

    en.wikipedia.org/wiki/Scabbling

    In modern construction, scabbling is a mechanical process of removing a thin layer of concrete from a structure, typically achieved by compressed air powered machines. A typical scabbling machine uses several heads, each with several carbide or steel tips that peck at the concrete. It operates by pounding a number of tipped rods down onto the ...

  6. Dog (engineering) - Wikipedia

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

    It may hold another object in place by blocking it, clamping it, or otherwise obstructing its movement. Or it may couple various parts together so that they move in unison – the primary example of this being a flexible drive to mate two shafts in order to transmit torque. Some devices use dog clutches to lock together two spinning components.

  7. Sleeve (construction) - Wikipedia

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

    For example, a 4" pipe, with 1" of thermal insulation makes a 6" penetrant (1" pipe covering on each side of the pipe), plus two pipe sizes = an 8" sleeve, creating a 1" annulus. In case of insulated piping, the size of the insulation must be taken into account for the intended firestop certification listing .

  8. Emcor - Wikipedia

    en.wikipedia.org/wiki/Emcor

    The company's electrical and mechanical construction services division, representing 67% of revenues in 2024, provides construction and operation services for infrastructure such as power stations, including those that provide sustainable energy such as photovoltaic systems; food processing; road lighting and traffic control systems, and other ...

  9. Notch (engineering) - Wikipedia

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

    Charpy test sample with a notch In mechanical engineering and materials science , a notch refers to a V-shaped, U-shaped, or semi-circular defect deliberately introduced into a planar material. In structural components, a notch causes a stress concentration which can result in the initiation and growth of fatigue cracks.

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