A foldable gantry comprising a beam and a first leg assembly, the first leg assembly being pivotally mounted at a first end of the beam such that the first leg assembly can move between a first, stowed, position and a second, deployed, position.

The invention provides a crane assembly for lifting a load comprising: a pair of guides (2) positioned parallel to one another; a carriage (4,40) associated with each guide (2) and movable along each guide (2); a bridge (1) having an attachment point (8) for attaching the load, the bridge (1) being attached between the carriages (4,40) through connector arms (3), each connector arm (3) being attached through a lower end (31) to the bridge (1) and pivotable (5) at least about an axis perpendicular to the bridge, each connector arm (3) being attached at an upper end (32) to the corresponding carriage (4,40) through a multi-axis joint (33,35); wherein each multiaxis joint (33,35) is connected to the corresponding carriage (4,40) through a low friction thrust bearing (6) configured to rotate with initial movement of the corresponding carriage (4,40).

The invention provides a crane assembly for lifting a load comprising: a pair of guides (2) positioned parallel to one another; a carriage (4,40) associated with each guide (2) and movable along each guide (2); a bridge (1) having an attachment point (8) for attaching the load, the bridge (1) being attached between the carriages (4,40) through connector arms (3), each connector arm (3) being attached through a lower end (31) to the bridge (1) and pivotable (5) at least about an axis perpendicular to the bridge, each connector arm (3) being attached at an upper end (32) to the corresponding carriage (4,40) through a multi-axis joint (33,35); wherein each multiaxis joint (33,35) is connected to the corresponding carriage (4,40) through a low friction thrust bearing (6) configured to rotate with initial movement of the corresponding carriage (4,40).

A trolley for mounting on a beam of a gantry, comprising: a first plate; a roller assembly, mounted at an end of the first plate; a shaft, extending outwardly of the first plate; and a second plate, rotatably mounted on the shaft such that the second plate can move between a closed position, in which the second plate engages with the roller assembly and an open position in which the second plate does not engage with the roller assembly.

A trolley for mounting on a beam of a gantry, comprising: a first plate; a roller assembly, mounted at an end of the first plate; a shaft, extending outwardly of the first plate; and a second plate, rotatably mounted on the shaft such that the second plate can move between a closed position, in which the second plate engages with the roller assembly and an open position in which the second plate does not engage with the roller assembly.

A rail structure for a bearing wheel of a crane includes surfaces receiving rolling and horizontal forces. The rail structure includes two surfaces located at a distance from one another and receiving rolling forces. The rail structure preferably includes at least one basic plate and, arranged on top of it, a wear surface arrangement. The surfaces receiving rolling forces are formed to this wear surface arrangement at a distance from one another. A combination of a bearing wheel and a rail structure of the above type is also disclosed.

A rail structure for a bearing wheel of a crane includes surfaces receiving rolling and horizontal forces. The rail structure includes two surfaces located at a distance from one another and receiving rolling forces. The rail structure preferably includes at least one basic plate and, arranged on top of it, a wear surface arrangement. The surfaces receiving rolling forces are formed to this wear surface arrangement at a distance from one another. A combination of a bearing wheel and a rail structure of the above type is also disclosed.

A gantry system has at least one crane assembly, at least one support post, and at least one hoist. The crane assembly has a stationary base, a rotating base, and a crane arm. The rotating base is attached to both the stationary base and the crane arm in such a ways as to allow the rotating base and the crane arm to rotate while the stationary base remains stationary. The crane arm is supported on its far end by a support post. The crane assembly is configured such that the support post rests on an in-place girder. A hoist is attached and can move along the crane arm to position a railway component, such as a replacement girder and/or a precast panel.

A running wheel (1, 2) for a crane (16), in particular gantry crane, comprising a shaft (3), a wheel rim (4) and a hub (5) connecting the shaft (3) to the wheel rim (4) for rotation therewith, at least one connection between the hub (5) and the shaft (3) and/or between the hub (5) and the wheel rim (4) having a press fit (6) and a first form fit established by a first stop surface (8), the first form fit blocking a relative movement of the hub (5) in relation to the shaft (3) or the wheel rim (4) in a first direction (17) running parallel to an axis of rotation (7) of the running wheel (1, 2), wherein the connection additionally has at least one second form fit established by a second stop surface (9), wherein the second form fit blocks the relative movement of the hub (5) in relation to the shaft (3) or the wheel rim (4) in a second direction (18) opposed to the first direction (17).

A running wheel (1, 2) for a crane (16), in particular gantry crane, comprising a shaft (3), a wheel rim (4) and a hub (5) connecting the shaft (3) to the wheel rim (4) for rotation therewith, at least one connection between the hub (5) and the shaft (3) and/or between the hub (5) and the wheel rim (4) having a press fit (6) and a first form fit established by a first stop surface (8), the first form fit blocking a relative movement of the hub (5) in relation to the shaft (3) or the wheel rim (4) in a first direction (17) running parallel to an axis of rotation (7) of the running wheel (1, 2), wherein the connection additionally has at least one second form fit established by a second stop surface (9), wherein the second form fit blocks the relative movement of the hub (5) in relation to the shaft (3) or the wheel rim (4) in a second direction (18) opposed to the first direction (17).