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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.
A Safe Load Indicator (SLI) or an Automatic Safe Load Indicator (ASLI) is a device which is installed on mobile or portal cranes to alert the operator if the lift is exceeding the safe operating range of the machinery. [1] In some cases, the device will physically lock the machinery in circumstances it determines to be unsafe.
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.
The shed was fitted an electric wheel drop, overhead gantry cranes and illuminated inspection pits. [ 15 ] [ 16 ] In 1955 the "No 2" shed was re-roofed with a steel frame covered in corrugated iron sheeting.
Stothert & Pitt crane with Toplis gear. An early form of level-luffing gear was the "Toplis" design, invented by a Stothert & Pitt engineer in 1914. [2] [3] The crane jibs luffs as for a conventional crane, with the end of the jib rising and falling. The crane's hook is kept level by automatically paying out enough extra cable to compensate for ...
Each crane has a span of 140 metres (459 ft) and can lift loads of up to 840 tonnes to a height of 70 metres (230 ft). Their combined lifting capacity of almost 1,700 tonnes is one of the largest in the world. Prior to commissioning, the cranes were tested up to 1,000 tonnes, which bent the gantry downwards by over 30 centimetres (12 in).
Until it was removed in 2008, it was the largest gantry crane in North America. [23] The final construction project for the yard came in the form of construction of five 2nd Lieutenant John P. Bobo Class of Maritime Prepositioning ships. These ships could house equipment and supplies to house 4,000 Marines for thirty days, as well as everything ...
The vessel is typically fitted with two Gantry cranes for self-loading and unloading, with a typical SWL (safe working load) between 30 and 80 tons.Different equipment is connected to the gantry crane depending on cargo type as vacuum clamps for paper, unihook for unitised cargo, container frame and grab for bulk cargoes.
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