Asahi Engineering Co., Ltd.

Eco Japan Co., Ltd.

Other

Ae Japan Co., Ltd.

Fumihiro Saito

Mitsuhiro Tokuno

Kazutoshi Tsuda

Seio Takeshima

Yoshiaki Nakai

Mitsushiro Tokuno

In a rigid connection structure of a bridge pier and concrete girder, a joint-equipped PC concrete girder is constituted by burying a rear half part of a shaped-steel joint formed of short shaped-steel respectively in both ends of the concrete girder and protruding a front half part of each shaped-steel joint respectively from each end face of the concrete girder, the respective shaped-steel joint portions protruded from the respective end faces of the concrete girders are supported on a bridge abutment face of a bridge pier while being connected to a connection strip member which arises from the bridge abutment face, and the respective shaped-steel joint portions and the connection strip member are buried in connection concrete which is additionally casted on the bridge abutment face.

Rigid connection structure of bridge pier and concrete girder

A floor slab bridge structure is capable of enhancing the strength with which bridge girders and concrete bridge piers are rigidly joined so as to effectively suppress expansion and contraction, deflection, and distortion of the bridge girders, and to synergistically enhance the strength of connection concrete itself against the expansion and contraction, distortion, etc., to thereby be effective to prevent collapse of a bridge due to a large earthquake. Slab concrete is hammer-set between sides of respective bridge girders, which are spaced apart in a bridge width direction, along a length direction of the bridge girders. Connection concrete, in which bridge girder portions supported on bridge bottom surfaces of concrete bridge piers supporting the bridge girders are embedded, is additionally deposited on the bridge bottom surfaces to form a floor slab bridge structure constituting a rigid joining structure. The slab concrete and the concrete bridge piers are thus joined together through the connection concrete.

Floor slab bridge structure

A floor structure comprises a plurality of steel beamsarranged in parallel, each steel beamincluding a web, an upper flange disposed at an upper end of the web, and a lower flange disposed at a lower end of the web, a floor surface being formed on the upper flange. The floor structure further includes displacement preventing spacers interposed between the upper flanges and/or lower flanges of the adjacent steel beams. Each displacement preventing spacer includes a load receiving part which is brought into engagement with the adjacent upper flanges and/or lower flanges to receive an active load incurred by the individual steel beamsso as to inhibit the steel beamsfrom displacing downward.

Floor structure

A floor structure comprises a plurality of steel beamsarranged in parallel, each steel beamincluding a web, an upper flange disposed at an upper end of the web, and a lower flange disposed at a lower end of the web, a floor surface being formed on the upper flange. The floor structure further includes a displacement preventing spacer interposed between the upper flanges and/or lower flanges of the adjacent steel beams. The displacement preventing spacer includes a load receiving part which is brought into engagement with the adjacent upper flanges and/or lower flanges to receive an active load incurred by the individual steel beamsso as to inhibit the steel beamsfrom displacing downward.

A construction of a floor slab bridge includes a plurality of columnar H-shaped steels each disposed between adjacent bridge legs and arranged in side-by-side relation with an end face of a lower flange abutted with a corresponding end face of the adjacent columnar H-shaped steel. A lower concrete layer is formed by placing concrete in a space defined between the upper and lower flanges and between adjacent web plates through a concrete inlet port formed between the adjacent upper flange, and an upper concrete layer is formed by placing concrete on the upper flange. An iron reinforcement is horizontally disposed on the upper flanges, and an iron reinforcement is suspended in the space from the horizontal iron reinforcement through the concrete inlet port.

Structure of floor slab bridge

Through co-action between auxiliary triangular structural frames, which are each constructed at opposite ends of a truss girder or arch girder, and a cable stretched between the auxiliary triangular structural frames, an upwardly directed force is exerted to the truss girder or arch girder, thereby effectively inducing a load resisting force. A reinforcement structure of a truss bridge or arch bridge is comprised of a truss girder or arch girder, a first and a second end of which are each provided with a main triangular structural frame. The main triangular structural frame is provided at an inner side thereof with an auxiliary triangular structural frame. The auxiliary triangular structural frame is joined at vertexes thereof with frame structural elements at respective sides of the main triangular structural frame. A cable extends in a longitudinal direction of the truss bridge, being stretched between a nearby part of a joined part at one of the vertexes of the auxiliary triangular structural frame on a side of the first end of the truss girder or arch girder and a nearby part of a joined part at a corresponding one of the vertexes of the auxiliary triangular structural frame on a side of the second end of the truss girder or arch girder. Deflecting structure, adapted to exert a downwardly directed force to the cable, is inserted between the cable and a lower chord of the truss girder or arch girder so as to tension the cable, and an upwardly directed force is exerted to the lower chord by a reaction force attributable to tension of the cable via the deflecting structure.

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Ishikawa-ken, Japan

Fumihiro Saito