Abstract

A composite beam girder and a method for constructing same are disclosed. The composite beam girder according to an embodiment of the present invention comprises: a main girder; a girder center stiffener coupled to the upper center area of the main girder to reinforce the upper center area of the main girder; and girder side stiffeners arranged with gaps between same and the girder center stiffener, the girder side stiffeners being coupled to both side areas of the main girder and having lower strength than the area to which the girder center stiffener is coupled.

IPC Classes  ?

• E04C 3/293 - JoistsGirders, trusses, or truss-like structures, e.g. prefabricatedLintelsTransoms built-up from parts of different materials the materials being steel and concrete
• E04C 3/10 - JoistsGirders, trusses, or truss-like structures, e.g. prefabricatedLintelsTransoms of metal prestressed
• E01D 2/00 - Bridges characterised by the cross-section of their bearing spanning structure
• E01D 101/32 - Metal prestressed

Abstract

A power control system for amphibious mobility according to the present invention comprises a land-driving wheel and a water-driving propeller. When the land-driving wheel and the water-driving propeller are driven at a predetermined rotational speed ratio, if the rotational speed ratio of the land-driving wheel and the water-driving propeller changes, the driving force is increased for whichever, between the land-driving wheel and the water-driving propeller, that has a reduced rotational speed.

IPC Classes  ?

• E01D 2/00 - Bridges characterised by the cross-section of their bearing spanning structure
• E01D 22/00 - Methods or apparatus for repairing or strengthening existing bridges
• E01D 101/30 - Metal