Gantry crane is an non-cantilever, double beam, wheel-rail crane, and comprised of portal frame, cart operation mechanism, trolley assembly(two trolleys), cable towlines, driver's cabin, power cable reel, electrical control system, lubrication system, maintenance crane and platform railings etc. Main girder adopts the middle-rail double trapezoid box type structure. This crane is equipped with two trolleys,with the hoisting capacity 1000t each; the maximum hoisting capacity will be 2000t when the spacing between main hooks is≥20m.