A crane, such as a bridge crane or gantry crane, having at least one horizontally extending crane girder, which is designed as a lattice girder having a plurality of braces and on which a crane trolley having a lifting device can be moved. At least some of the braces are planiform, and each of the planiform braces has a flat main surface, which extends transversely to a longitudinal direction of the crane girder. A first brace and a second brace form a brace pair and are arranged in an X-shape in relation to each other as viewed transversely to the longitudinal direction of the crane girder.

The invention relates to a crane, in particular an overhead crane or gantry crane, having at least two crane girders that extend horizontally in a longitudinal direction. The crane is designed as trussed girders and each girder includes an upper run with a moveable crane trolley and lifting gear. Each crane girders is composed of two upper run profiles that are connected together via a running rail for the crane trolley. By way of such a design, particularly simple assembly of the crane girders or of the crane can be achieved. Therefore, commercially available, conventional structural steel can be used for the upper run, from which the upper run is produced in a simple manner in terms of manufacturing technology by simple connection to a corresponding running rail.

The invention relates to a crane, in particular an overhead crane or gantry crane, having at least two crane girders that extend horizontally in a longitudinal direction. The crane is designed as trussed girders and each girder includes an upper run with a moveable crane trolley and lifting gear. Each crane girders is composed of two upper run profiles that are connected together via a running rail for the crane trolley. By way of such a design, particularly simple assembly of the crane girders or of the crane can be achieved. Therefore, commercially available, conventional structural steel can be used for the upper run, from which the upper run is produced in a simple manner in terms of manufacturing technology by simple connection to a corresponding running rail.

A method for building a bridge, said bridge (4) comprising piers (6) and at least one deck (8), the method comprising: a cantilever step, wherein a girder (16) is set in a cantilevered position relative to a bank or to a constructed zone (12) of the bridge so that the girder comprises a first end (24) overhanging the bank or the constructed zone, and a second end (26) overhanging a construction zone (14) of the bridge, a construction step, wherein pier elements and deck elements (10) are installed in said construction zone (14) via a first and a second lifting devices (18, 20) mounted movable on the girder (16) between the first and second ends (24, 26).

The first and second lifting devices (18, 20) cross one another along the girder during the cantilever step and/or during the construction step.

Associated bridge-building apparatus.

A crane girder for a crane, such as an overhead or gantry crane, that is configured as a trussed girder with an upper chord, a lower chord, and braces connecting the chords to each other. At least one of the braces is designed flatly and has a main surface which extends transversely to a longitudinal direction of the crane girder. The brace is removably secured to the upper chord and/or the lower chord.

A crane girder for a crane, such as an overhead or gantry crane, that is configured as a trussed girder with an upper chord, a lower chord, and braces connecting the chords to each other. At least one of the braces is designed flatly and has a main surface which extends transversely to a longitudinal direction of the crane girder. The brace is removably secured to the upper chord and/or the lower chord.

Crane girder (1) for a crane (3), wherein the crane girder (1) includes a hollow profile (4) having an outer wall (6) enclosing a cavity (5) and extends longitudinally, and the outer wall (6) of the crane girder (1), as seen in a cross-section through the crane girder (1), has a shape which bulges outwards at least in some regions in order to reduce aerodynamic drag, wherein the outer wall (6), as seen in the cross-section through the crane girder (1), has two sections (10, 11) facing one another with an outwards bulging shape, which are joined together by two straight wall sections (12) of the outer wall (6), these straight wall sections face one another, and the crane girder (1) has at least one running surface (13) for at least one running wheel (14) of a trolley (15) of a lifting tool of the crane (3), wherein the sections (10, 11) facing one another with an outwards bulging shape point upwards and downwards in an operating position of the crane girder and the straight wall sections (12) delimit the crane girder (1) on the sides.

Crane girder (1) for a crane (3), wherein the crane girder (1) includes a hollow profile (4) having an outer wall (6) enclosing a cavity (5) and extends longitudinally, and the outer wall (6) of the crane girder (1), as seen in a cross-section through the crane girder (1), has a shape which bulges outwards at least in some regions in order to reduce aerodynamic drag, wherein the outer wall (6), as seen in the cross-section through the crane girder (1), has two sections (10, 11) facing one another with an outwards bulging shape, which are joined together by two straight wall sections (12) of the outer wall (6), these straight wall sections face one another, and the crane girder (1) has at least one running surface (13) for at least one running wheel (14) of a trolley (15) of a lifting tool of the crane (3), wherein the sections (10, 11) facing one another with an outwards bulging shape point upwards and downwards in an operating position of the crane girder and the straight wall sections (12) delimit the crane girder (1) on the sides.

The invention relates to a crane, particularly a bridge crane or gantry crane, including at least one crane girder extending horizontally and designed as a truss with a plurality of braces, on which girder a crane trolley with a lifting gear is movable. At least some of the braces have a flat shape. The flat-shaped braces each have a flat main surface that extends in each case transversely to a longitudinal direction of the crane girder.

The invention relates to a crane, particularly a bridge crane or gantry crane, including at least one crane girder extending horizontally and designed as a truss with a plurality of braces, on which girder a crane trolley with a lifting gear is movable. At least some of the braces have a flat shape. The flat-shaped braces each have a flat main surface that extends in each case transversely to a longitudinal direction of the crane girder.