Wiktionary
n. A large crane mounted on a platform that usually runs back and forth on parallel tracks astride the work area.
Wikipedia
Gantry cranes are a type of crane built atop a gantry, which is a structure used to straddle an object or workspace. 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 usual distinction 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 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.
Gantry cranes in the form of container cranes are prominent features of most container terminals, used to load intermodal containers on and off container ships. 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.
Usage examples of "gantry crane".
Bock had found a ship heading to the right port, eliminating the need to transship at Rotterdam Qati disliked deviation from the plan, but a careful check of shipping schedules showed that the five days saved might be important, and he agreed to it He and Ghosn watched the gantry crane lift up the cargo container and move it onto the deck of the Carmen Vita, a Greek-flag container ship on the Mediterranean run She would sail on the evening tide, and arrive in the United States in eleven days They could have chartered a )et aircraft and done this, Qati thought, but it would have been too dangerous.
They rested on flat eight-wheeled steel bogies, and on either side of each rocket was a gantry crane, almost as high as the rocket itself, each crane mounted on a four-wheeled bogie: from the top and bottom of the gantries protruding clamps reached out to hold the rockets firmly in position.
In a short time they had a clear view of Orion waiting on its pad, project personnel swarming over the gantry crane as they performed a variety of last-day chores.
An enormous, crude multistage rocket was already in launch position, being serviced by something Kirk dimly remembered was called a gantry crane.
It also had cranes, but all four of those were rotating cranesno, there was one gantry crane mounted on the underbelly.
A huge cargo rocket whose needle nose loomed against the sky in a launching platform had toppled, bringing a gantry crane down with it in a mass of tangled wreckage!
Ted Polich, the shortest of the three longshoremen, jerked a balding head upward at the gantry crane that loomed over the dock like a mechanical bird of prey.
The spindles whirred, and the screen lit to show a view of a widely spaced forest of gigantic missiles, evidently being viewed almost at capsule height, as if from the top of a gantry crane.