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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. They are also called portal cranes, the "portal" being the empty space straddled by the gantry. The terms gantry crane and overhead crane (or bridge crane) are often used interchangeably, as both types of crane straddle their workload. The distinction most often drawn between the two is that with gantry cranes, the entire structure (including gantry) is usually wheeled (often on rails). By contrast, the supporting structure of an overhead crane is fixed in location, often in the form of the walls or ceiling of a building, to which is attached a movable
hoist Hoist may refer to: * Hoist (device), a machine for lifting loads * Hoist controller, a machine for raising and lowering goods or personnel by means of a cable * Hydraulic hooklift hoist, another machine * Hoist (mining), another machine * Hoist ( ...
running overhead along a rail or beam (which may itself move). Further confusing the issue is that gantry cranes may also incorporate a movable beam-mounted hoist in addition to the entire structure being wheeled, and some overhead cranes are suspended from a freestanding gantry.


Variants


Ship-to-shore gantry crane

Ship-to-shore gantry cranes are imposing, multi-story structures prominent at most
container terminal A container port or container terminal is a facility where cargo containers are transshipped between different transport vehicles, for onward transportation. The transshipment may be between container ships and land vehicles, for example train ...
s, used to load
intermodal container An intermodal container, often called a shipping container, is a large standardized shipping container, designed and built for intermodal freight transport, meaning these containers can be used across different modes of transport – from sh ...
s on and off
container ship A container ship (also called boxship or spelled containership) is a cargo ship that carries all of its load in truck-size intermodal containers, in a technique called containerization. Container ships are a common means of commercial intermoda ...
s. They operate along two rails (waterside and landside designations) spaced based on the size of crane to be used. ;Ship-to-shore crane elements Lateral movement system: : A combination of two sets of typically ten rail wheels. The lateral movement is controlled by a cabin along the landside wheel. During any lateral movement, lights and sirens operate to ensure safety of the crew operating adjacent to the crane. The wheels are mounted to the bottom of the vertical frame/bracing system. Vertical frame and braces: : A structurally designed system of beams assembled to support the boom, cabin, operating machinery, and the cargo being lifted. They display signage describing restrictions, requirements and identifiers. Crane boom: : A horizontal beam that runs transversely to the berth. It spans from landside of the landside rail wheels to a length over the edge of the berth. The waterside span is based on the size of ship that it can successfully load/unload. Beams also have the ability to be raised for storage purposes. Hook: : Device which moves vertically to raise and lower cargo as well as horizontally along the boom's length. For container cranes, a spreader is attached to span the container and lock it safely in place during movement. Operating cabin: : Encased setup with glass paneled flooring for operator to view the cargo being moved. Elevators which are located along vertical frame members are used to get crew up and down from the cabin. Storage equipment: : For temporary storage options between vessel operations, one steel pin is inserted into anchorage arm dropped from each wheel set into a stow pin assembly. This setup is designed to prevent lateral movement along the rails. During hurricanes and other emergency shut down situations, tie down assemblies are used. Two angled arms are anchored at each end of each set of wheels. This setup prevents longitudinal movement along the rails as well as prevents tipping of the crane due to uplift from high velocity winds. Ship-to-shore gantry cranes are often used in pairs or teams of cranes in order to minimize the time required to load and unload vessels. As container ship sizes and widths have increased throughout the 20th Century, ship-to-shore gantry cranes and the implementation of those gantry cranes have become more individualized in order to effectively load and unload vessels while maximizing profitability and minimizing time in port. One example are systems where specialized berths are built that accommodate one vessel at a time with ship-to-shore gantry cranes on both sides of the vessel. This allows for more cranes and double the workspace under the cranes to be used for transporting cargo off dock. The first quayside container gantry crane was developed in 1959 by Paceco Corporation.


Full gantry crane

Full gantry cranes (where the load remains beneath the gantry structure, supported from a beam) are well suited to lifting massive objects such as ships' engines, as the entire structure can resist the
torque In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of th ...
created by the load, and
counterweight A counterweight is a weight that, by applying an opposite force, provides balance and stability of a mechanical system. The purpose of a counterweight is to make lifting the load faster and more efficient, which saves energy and causes less we ...
s are generally not required. These are often found in shipyards where they are used to move large ship components together for construction. They use a complex system of cables and attachments to support the massive loads undertaken by the full gantry cranes. Some full gantry cranes of note are Samson and Goliath and Taisun. Samson and Goliath are two full gantry cranes located in the
Harland and Wolff Harland & Wolff is a British shipbuilding company based in Belfast, Northern Ireland. It specialises in ship repair, shipbuilding and offshore construction. Harland & Wolff is famous for having built the majority of the ocean liners for the W ...
shipyard A shipyard, also called a dockyard or boatyard, is a place where ships are built and repaired. These can be yachts, military vessels, cruise liners or other cargo or passenger ships. Dockyards are sometimes more associated with maintenance ...
in
Belfast Belfast ( , ; from ga, Béal Feirste , meaning 'mouth of the sand-bank ford') is the capital and largest city of Northern Ireland, standing on the banks of the River Lagan on the east coast. It is the 12th-largest city in the United Kingdom ...
. They have spans of and can lift loads of up to to a height of . In 2008, the world's strongest gantry crane, Taisun, which can lift , was installed in
Yantai Yantai, formerly known as Chefoo, is a coastal prefecture-level city on the Shandong Peninsula in northeastern Shandong province of People's Republic of China. Lying on the southern coast of the Bohai Strait, Yantai borders Qingdao on the ...
, China at the
Yantai Raffles Shipyard Yantai CIMC Raffles Shipyard () is a shipbuilding company in Yantai, Shandong Province, People's Republic of China. The shipyard is one of three operated by CIMC Raffles Offshore Ltd. Yantai Raffles specializes in offshore and marine fabricatio ...
. In 2012, a capacity crane, the "
Honghai Crane The Honghai Crane is a mobile gantry crane built by the Chinese Honghua Group. It was completed in Jiangsu in 2014, becoming the largest movable gantry crane by lift capacity, being capable of lifting 22,000 tonnes to a height of 65 m. Description ...
" was planned for construction in Qidong City, China and was finished in 2014.


Rubber-tyred gantry crane

Smaller gantry cranes are also available running on rubber tyres so that tracks are not needed. Rubber tyred gantry cranes are essential for moving containers from berths throughout the rest of the yard. For this task they come in large sizes, as pictured to the left, that are used for moving to straddle multiple lanes of rail, road, or container storage. They also are capable of lifting fully loaded containers to great heights. Smaller rubber tyred gantry cranes come in the form of straddle carriers which are used when moving individual containers or vertical stacks of containers. Portable gantry crane systems, such as rubber tyred gantry cranes, are in high demand in terminals and ports restricted in size and reliant on maximizing vertical space and not needing to haul containers long distances. This is due to the relatively slow speed yet high reach of rubber tyred gantry cranes when compared to other forms of container terminal equipment.


Portable gantry crane

Portable gantry cranes are used to lift and transport smaller items, usually less than . They are widely used in the HVAC, machinery moving and fine art installation industries. Some portable gantry cranes are equipped with an enclosed track, while others use an I-beam, or other extruded shapes, for the running surface. Most workstation gantry cranes are intended to be stationary when loaded, and mobile when unloaded. Workstation Gantry Cranes can be outfitted with either a wire rope hoist or a lower capacity chain hoist.


Gallery

File:The forward island of the queen elizabeth class aircraft carrier being attached to the main body of the carrier.jpg, A ZPMC gantry crane used for construction of the British aircraft carrier HMS ''Queen Elizabeth'' File:Maschine zum Übersetzen der Diligencen auf Eisenbahnwaggons.JPG, A primitive gantry crane to put a
stagecoach A stagecoach is a four-wheeled public transport coach used to carry paying passengers and light packages on journeys long enough to need a change of horses. It is strongly sprung and generally drawn by four horses although some versions are dra ...
on a
flat car A flatcar (US) (also flat car, or flatbed) is a piece of rolling stock that consists of an open, flat deck mounted on a pair of trucks (US) or bogies (UK), one at each end containing four or six wheels. Occasionally, flat cars designed to carry ...
. The drawing is exhibited in
Deutsches Museum Verkehrszentrum The Deutsches Museum (''German Museum'', officially (English: ''German Museum of Masterpieces of Science and Technology'')) in Munich, Germany, is the world's largest museum of science and technology, with about 28,000 exhibited objects from ...
, Munich, Germany. File:Portable Aluminum Gantry.jpg, alt=1 Ton Capacity Portable Aluminum Gantry Crane, capacity portable gantry crane File:Gantry Crane 1.jpg, Gantry crane at the site of the Homestead Steel Works in Pennsylvania, U.S.


See also

*
List of historical harbour cranes The list of historical harbour cranes includes historical harbour cranes from the Middle Ages to the introduction of metal cranes in the Industrial Revolution during the 19th century. Modern reconstructions are also listed. References * * * ...
* Straddle carrier


References

{{Cranes Port infrastructure Cranes (machines)