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 securement for crawler cranes and system and method for use of the same are disclosed. In one embodiment of the system, a pair of structural securements are spaced at approximately a track-distance apart with respect to the crawler crane and coupled together by multiple transverse support members. When the crawler crane is driven onto the structural securements and fastened thereto, the tipping fulcrum of the crawler crane is shifted, thereby requiring a greater tipping force to tip and adding stability during high wind events.

A main girder of a crane for a crane trolley moving in a horizontal direction along the girder includes a cellular structure in a longitudinal direction thereof that has at least two separate, yet interconnected, longitudinal cellular elements, each cellular element including an outer cover structure and at least one outer cover structure having an inside filled with a core.

A main girder of a crane for a crane trolley moving in a horizontal direction along the girder includes a cellular structure in a longitudinal direction thereof that has at least two separate, yet interconnected, longitudinal cellular elements, each cellular element including an outer cover structure and at least one outer cover structure having an inside filled with a core.

A lifting mechanism includes a lifting beam, a hanging portion suspended below the lifting beam and including a hanging base, a hanging chain, a movable sprocket disposed on the hanging base, a distance adjusting sprocket, and a power mechanism. The distance adjusting sprocket and the power mechanism are arranged side by side and separately on the lifting beam. The power mechanism includes a fixed sprocket and a driving portion. The fixed sprocket is driven by the driving portion to drive the hanging chain to move, so as to lift or lower the hanging portion. An end of the hanging chain is fixed to the lifting beam, and the other end of the hanging chain engages the movable sprocket, the fixed sprocket, and the distance adjusting sprocket, or the other end of the hanging chain engages the movable sprocket, the distance adjusting sprocket, and the fixed sprocket.

A lifting mechanism includes a lifting beam, a hanging portion suspended below the lifting beam and including a hanging base, a hanging chain, a movable sprocket disposed on the hanging base, a distance adjusting sprocket, and a power mechanism. The distance adjusting sprocket and the power mechanism are arranged side by side and separately on the lifting beam. The power mechanism includes a fixed sprocket and a driving portion. The fixed sprocket is driven by the driving portion to drive the hanging chain to move, so as to lift or lower the hanging portion. An end of the hanging chain is fixed to the lifting beam, and the other end of the hanging chain engages the movable sprocket, the fixed sprocket, and the distance adjusting sprocket, or the other end of the hanging chain engages the movable sprocket, the distance adjusting sprocket, and the fixed sprocket.

A box girder configured as a crane girder has two side plates spaced apart from each other, at least one chord plate connecting the two side plates to each other and at least one transverse plate arranged between the side plates and connecting the side plates to each other, with a welded joint provided between the respective chord plate and the side plates. In order to facilitate the manufacturing process of the box girder, at least one form-fitting connection configured as a plug-in connection is provided between the transverse plate and each of the two side plates. A crane may thus be configured having such a box girder. A corresponding method of manufacturing may also be employed for forming the box girder.

A box girder configured as a crane girder has two side plates spaced apart from each other, at least one chord plate connecting the two side plates to each other and at least one transverse plate arranged between the side plates and connecting the side plates to each other, with a welded joint provided between the respective chord plate and the side plates. In order to facilitate the manufacturing process of the box girder, at least one form-fitting connection configured as a plug-in connection is provided between the transverse plate and each of the two side plates. A crane may thus be configured having such a box girder. A corresponding method of manufacturing may also be employed for forming the box girder.

An overhead crane has first and second runway rails that extend parallel to a generally horizontal runway axis and a bridge that extends along a bridge axis that is generally horizontal and perpendicular to the runway axis and that is movable on the runway rails along the runway axis. The bridge includes a first bridge reinforcement member pre-loaded under tension to provide an upward deflection of the bridge rail. The first bridge reinforcement member may have at least two upwardly extending struts and a common upper end where the at least two struts meet, the at least two struts having lower ends mechanically connected to the bridge rail at positions longitudinally spaced apart with respect to the bridge axis. The lower ends of the at least two struts are longitudinally translatable along the bridge rail to adjust the tension on the first bridge reinforcement member to thereby adjust the extent of upward deflection of the bridge rail. The bridge further includes a pair of second bridge reinforcement members extending between the upper end of the first bridge reinforcement member and mechanically connected to the bridge rail proximate the first and second outer ends, the second bridge reinforcement members loaded in compression. The runway rails may be constructed in a similar manner as the bridge rail.

Methods and apparatus for constructing or reconstructing refractory structures, e.g., glass furnace regenerator structures and/or glass furnace structures having walls formed of refractory block and buck stays externally supporting the walls are provided. A header support beam assembly is provided so as to extend at an angle between respective pairs of side wall buckstays. A moveable hoist moveable hoist supporting assembly supported by the header support beam assembly and moveable between the opposed pairs of side and end walls. In such a manner, refractory components, e.g., refractory wall blocks and/or checker bricks, may be hoisted into position when constructing or reconstructing the refractory structure.