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  2. Rubber tyred gantry crane - Wikipedia

    en.wikipedia.org/wiki/Rubber_tyred_gantry_crane

    [1] Advantages:its mobility gives a rubber tyred gantry crane wide appliance Being mobile, RTGs are often powered by diesel generator systems (gensets) of 100 to 600 kW (134 to 805 hp). Due to the lack of an electrical grid to dump energy when containers are being lowered they often have large resistor packs to rapidly dissipate the energy of a ...

  3. Glossary of construction cost estimating - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_construction...

    A Allocation of costs is the transfer of costs from one cost item to one or more other cost items. Allowance - a value in an estimate to cover the cost of known but not yet fully defined work. As-sold estimate - the estimate which matches the agreed items and price for the project scope. B Basis of estimate (BOE) - a document which describes the scope basis, pricing basis, methods ...

  4. Crane (machine) - Wikipedia

    en.wikipedia.org/wiki/Crane_(machine)

    Gantry crane A gantry crane to put a stagecoach on a flat car. A gantry crane has a hoist in a fixed machinery house or on a trolley that runs horizontally along rails, usually fitted on a single beam (mono-girder) or two beams (twin-girder). The crane frame is supported on a gantry system with equalized beams and wheels that run on the gantry ...

  5. Gantry crane - Wikipedia

    en.wikipedia.org/wiki/Gantry_crane

    A gantry crane is a crane built atop a gantry, which is a structure used to straddle an object or workspace. They can range from enormous "full" gantry cranes, capable of lifting some of the heaviest loads in the world, to small shop cranes, used for tasks such as lifting automobile engines out of vehicles.

  6. Launching gantry - Wikipedia

    en.wikipedia.org/wiki/Launching_gantry

    Underslung (lower-beam) launching gantry used for Skyline guideway construction (2015). A launching gantry (also called bridge building crane, and bridge-building machine) is a special-purpose mobile gantry crane used in bridge construction, specifically segmental bridges that use precast box girder bridge segments or precast girders in highway and high-speed rail bridge construction projects.

  7. Overhead crane - Wikipedia

    en.wikipedia.org/wiki/Overhead_crane

    Gantry-style overhead cranes of the Hainaut quarry in Soignies, Belgium. An overhead crane, commonly called a bridge crane, is a type of crane found in industrial environments. An overhead crane consists of two parallel rails seated on longitudinal I-beams attached to opposite steel columns by means of brackets. The traveling bridge spans the gap.

  8. Pre-determined overhead rate - Wikipedia

    en.wikipedia.org/wiki/Pre-determined_overhead_rate

    The pre-determined overhead rate is calculated before the period begins. The first step is to estimate the amount of the activity base that will be required to support operations in the upcoming period. The second step is to estimate the total manufacturing cost at that level of activity.

  9. Level luffing crane - Wikipedia

    en.wikipedia.org/wiki/Level_luffing_crane

    A 3d animated model of a level-luffing crane. A level-luffing crane is a crane mechanism where the hook remains at the same level while luffing: moving the jib up and down, so as to move the hook inwards and outwards relative to the base.

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