Abstract: A system for construction of double U and single U steel composite structure for bridges and methods thereof are disclosed. The system comprising: a base slab (1), a plurality of top and bottom U shaped beams (2, 8) made of I section, exterior top and bottom slabs (3, 9), a bottom deck slab (4), foot path (5) and kerb (6). In precast scheme U shaped bottom beams (2) are placed at about 2 m interval and exterior slab and bottom deck slab are casted. Top U beams are casted in inverted position. Base slab is provided and bottom U system is placed and top U system is provided over bottom U system forming a full frame vierendeel type composite as a self-straining unit. Earth filling compaction to be done. The approaches are made of single U section and being extended with I beam and RCC slab. Cast in situ scheme is done similar.

Abstract: A modular system for streets formed of a top module, a bottom module, an internal cavity formed within the bottom module, cables positioned within said bottom module, a computing device, sensors operatively associated with said computing device, and communications hardware configured to communicate information from said sensors to a second computing device positioned exterior to said modular system.

Abstract: Improved tub girders and related manufacturing methods are provided, such as for example for use in road construction in connection with concrete bridges. Disclosed improved tub girders may include upper flanges that extending inwardly or outwardly. Disclosed improved tub girders may be provided with camber along the length of the girders. Ends of the disclosed improved tub girders may be provided with diaphragms. Disclosed improved tub girders may include a base section including one more access ports for enabling inspection of the interior of the girders after installation. Disclosed improved tub girders may include a plurality of stud members extending upwardly from upper flanges for engaging with a concrete bridge deck. Disclosed tub girders may be providing with a coating, such as galvanized, aluminized or metalized, to fight corrosion and extend life and limit need for inspection.

Abstract: An elevated guideway performing the function of supporting, guiding and propelling pneumatic transport vehicles for passengers and loads. The two-part elevated guideway is formed by two components, each corresponding to one side of the cross section, divided by a vertical axis passing through the center of the slot. Components are not symmetrical, the left hand component having a wider top table. Components are joined through a niche already present at the lower slabs which is filled with a structural resin. Niche for joining the two-part elevated guideway has a central type female-female fitting. The elevated guideway includes guideway guards, two additions for installing the propulsion duct slot seal, tubes for the electric power supply and telecommunication and control cables, the protective railing for protection in the side emergency gangway, the unit for securing the rail via the web thereof, rails and the third and fourth electric power supply rails of the vehicle.

Abstract: A bridge structure comprises a first supporting structure, at least one first hollow tube and a first monitor. The first supporting structure comprises bases, first pillars, a first platform. The first pillars are coupled to the bases, wherein each of the first pillars comprises first pillar chords and first pillar girders formed as first pillar trusses with the first pillar chords. The first platform is coupled to the first pillars, wherein the first platform comprises a first supporting plane, first platform chords and first platform girders formed as first platform trusses with the first platform chords. The at least one first hollow tube is located between the first pillar trusses or the first platform trusses. The first monitor is located in the at least one first hollow tube, wherein the first monitor is capable of monitoring a bridge stability.

Abstract: A slab bridge structure having improved rigid connection strength between bridge girders and concrete piers. The slab bridge structure has a rigid connection structure in which slab concrete (3) is poured between side surfaces of bridge girders (1) arranged in line in a bridge width direction, throughout a longitudinal direction of the bridge girders, connection concrete (12) in which bridge girder portions (1?) supported by a bridge seat (2a) of a concrete pier (2) that supports the bridge girders are embedded is further added onto the bridge seat, and the slab concrete and the concrete pier are concrete-joined through the connection concrete, the slab bridge structure further includes: a connecting rod (13) embedded in the concrete pier and projecting upward from the bridge seat of the pier; and a connecting plate (14) connecting upper end portions of the adjacent bridge girder portions.

Abstract: A structure includes a first frame including a slit portion; and a second frame including a plate portion configured to enter the slit portion. The slit portion includes an introducing portion, a first positioning portion, and a first tapered portion connecting the introducing portion and the first positioning portion. The plate portion includes a free end portion capable of entering the introducing portion, a second positioning portion determining a position of the plate portion with respect to a longitudinal direction of the slit portion, a third positioning portion determining a position of the plate portion with respect to an inserting direction into the slit portion, and a second tapered portion contactable to the first tapered portion and connecting the free end portion and the second positioning portion.

Abstract: A beam used for construction, particularly of short- to mid-span bridges. A beam can include flanges extending from a web that are joined to flanges of another beam. When joined two beams form an open internal void. The beams can be manufactured from concrete and include an embedded reinforcement cage. Manufacture of the beams utilizes a formwork that can be filled in a single pour.

Abstract: Abutment and bridge designs include a bridge superstructure and abutment wherein the abutment has a vertical portion of a backwall that can be fixedly joined to the end face of the bridge superstructure without an interdisposed expansion joint. A downward facing surface of the bridge superstructure can be fixedly joined to an upward facing surface of the abutment, or alternatively, a bearing pad may be disposed therebetween. The abutment may further comprise a backwall made from a plurality of panels fixedly joined to a plurality of supporting piles. The abutments and bridge superstructure may be made substantially from composite materials including recycled structural composite and other thermoplastics.

Abstract: A system for tension bracing a series of spaced girders forming a part of a bridge which includes a lateral member extending across the tops of the series of spaced girders. A first end of the lateral member is attached to a first girder in the series of spaced girders. A second end of the lateral member engages an adjustable mount, which is affixed to the last girder in the series of spaced girders. The adjustable mount adjusts the tension in the lateral member and, once a predetermined tension is reached, the lateral member is affixed to the intermediate girders in the series of spaced girders.

Abstract: An upper structure for a bridge includes a coping placed on the top end of a pier, and a girder held by the coping, wherein a side surface of the coping and an end surface of the girder are configured as inclined surfaces (or vertical surfaces), wherein a shear key protrudes on one of the inclined surfaces (or vertical surfaces), and a shear key slot is formed in another one of the inclined surfaces (or vertical surfaces) so as to be engaged with the shear key. The present disclosure can reduce the construction cost, can realize improved structural efficiency of the bridge upper structure, can realize an easy installation of the girders, can easily combine the girders with the coping without plastering or fixing with mortar by site work, and can efficiently resist to a shear stress that may be generated in the bridge.

Abstract: A system and method provides for repair/reconstruction of bridge and culvert constructions. Geosynthetically confined soils are used in combination with soil nails. The soil nails provide additional tensile strength below the areas reinforced with the geosynthetically confined soils. The soil nails may include both horizontal and vertical soil nails. Various forms of vertical tensioning support can be provided to include soil nails, micro-piles, sheet piling, and the like. The confined soils are installed at locations under and adjacent to the man made constructions, and can be provided in both symmetrical and asymmetrical configurations. For bridge constructions, the confined soils may be installed at a desired depth under the bridge girders, and under other primary support members of the bridge. Horizontal nails may be installed under and adjacent to the confined soils.

Abstract: A flange connection system for a concrete structure comprising a plurality of adjacent precast concrete members including a platform having a center panel and a first and second flange extending outward from the center panel in opposing directions. The system includes a first and second bent plate each having a horizontal member attached to the bottom surface of the adjacent flanges and a vertical member perpendicular to the horizontal member. The system includes a spacer plate extending in a vertical direction from about a lower edge of the first vertical member to below the first horizontal member and secured between the vertical members of the first and second bent plate with a plurality of fasteners. The first and second vertical member may flex at an upper portion allowing adjacent flange ends to move relative to one another.

Abstract: A composite floor panel includes a frame assembly having a base plate, a plurality of first lateral supports secured to the base plate, and a plurality of second lateral supports secured to the base plate. The first lateral supports lie in a first plane and the second lateral supports lie in a second plane. The first plane and the second plane each intersect the base plate and the first plane is disposed at an angle relative to the second plane. The composite floor panel also includes a concrete portion coupled to and supported by the first lateral supports and the second lateral supports.

Abstract: An upper structure for a bridge includes a coping placed on the top of a pier, and girders held by the coping, wherein the coping has girder holding grooves. The girders are installed continuously without using bridge bearings. The coping and the girders behave in an integrated state. The girders are held by being fitted into the grooves, so the coping is not excessively exposed to the outside. The girders and the coping are dry joined together in a prestressed state using prestressed steel strands. Further, the girders and the coping can be integrated with each other without being processed by site work.

Abstract: Beam placement during bridge construction by a carriage moving across an abutment or pier, supporting the end of a beam or pipe to position and align it on the abutment. A lift assembly lowers the end and the carriage is disengaged and moved to receive another beam, placing multiple parallel beams, without requiring a large crane. A carriage formed in sections separates to return to a new position. A screw jack or hydraulic unit moves the lift assembly, and deposits the beam on a load plate, and opposed separately-operated lift plates connected by a hinged cross-bar may form a beam-receiving basket assembly. Carriage rollers bear against a channel iron that protects underlying concrete structure from damage. A first set of rollers may bear against a horizontal surface and a second set of rollers bear against a vertical face of the abutment, aligning the carriage and beam along orthogonal axes.

Abstract: A structural concrete beam, and method therefor, comprising a prefabricated structural concrete portion and a poured-in-place structural concrete portion, wherein said poured-in-place portion comprises at least ten percent of the total weight of said structural concrete beam. Reinforcing extends from the prefabricated portion to the poured-in-place portion. In a preferred embodiment, the structural concrete beam is an “inverted-T” beam, and the prefabricated structural concrete portion comprises the lower corbel portion of the beam, and the poured-in-place structural concrete portion comprises the remaining upper stem portion of the beam.

Abstract: An upper structure for a bridge includes a coping placed on the top of a pier, and girders held by the coping, wherein the coping has girder holding grooves. The girders are installed continuously without using bridge bearings, thereby reducing the construction cost. The coping and the girders behave in an integrated state, thereby realizing improved structural efficiency. The girders are held by being fitted into the grooves, so the coping is not excessively exposed to the outside, thereby realizing a good appearance of the bridge. The girders and the coping are thy-joined together in a prestressed state using prestressed steel strands, so that the strength of the girders and the resistance to a negative bending moment can be increased. Further, the girders and the coping can be integrated with each other without being processed by site work, thereby realizing improved structural efficiency and reducing the construction period.

Abstract: The present invention relates to a fit-together type of precast concrete lining and bridging structural body in which main girders are integrated with deck plates. Precast concrete deck members connected in longitudinal and transverse directions are pre-stressed by pre-stressed members, thereby making it possible to increase load carrying capacity or rigidity of a structure to stably use the structure for a long time. Further, it is possible to support the load applied from the top of a deck structure with a small thickness, and to make the deck structure light. Due to a knockdown type (fit-together type), installation and dismantlement are easy, and reuse is possible, and thus it is possible to provide convenient construction and low production costs.

Abstract: An upper structure for a bridge includes a coping placed on the top end of a pier, and a girder held by the coping, wherein a side surface of the coping and an end surface of the girder are configured as inclined surfaces (or vertical surfaces), wherein a shear key protrudes on one of the inclined surfaces (or vertical surfaces), and a shear key slot is formed in another one of the inclined surfaces (or vertical surfaces) so as to be engaged with the shear key. The present disclosure can reduce the construction cost, can realize improved structural efficiency of the bridge upper structure, can realize an easy installation of the girders, can easily combine the girders with the coping without plastering or fixing with mortar by site work, and can efficiently resist to a shear stress that may be generated in the bridge.

Abstract: A precast composite flooring system utilizes girders and floor panels having steel lower structures placed in tension and concrete upper structures places in compression. Openings through a stem wall allow ducts, pipes, and conduits to be run therethrough. The system provides reduced weight over conventional precast or pour in place systems, allowing further reduction in the weight and size of other building components. The floor deck does not use tensioning strands, allowing openings to be formed at nearly any stage of construction and with reduced concern over cutting steel reinforcement. The floor panels and girders bolt together and bolt to a steel column frame, allowing for more efficient assembly.

Abstract: The present invention pertains to a composite girder for bridge construction. More preferably, a girder is formed in a rectangular shape that is horizontally long and opened at the top portion thereof, wherein the girder is convexly curved in the center so as to be formed in the shape of an arch. The girder has a compression section, a web and a tension section, which are integrally composed together; and is filled with concrete inside the girder so as to increase the sectional strength of the girder. Therefore, it is possible to reinforce a support that receives a great shearing stress even without the use of any rebar. Simultaneously, a stopper is formed on the inside surface of the compression section to prevent the separation of the steel materials and the concrete. Therefore, compared with the existing girders, the composite girder of the present invention may be mounted over a noticeably long span.

Abstract: A composite floor panel includes a concrete floor deck having a side portion and an edge member secured to the side portion. The edge member is configured to be positioned in proximity to an adjacent edge member. The adjacent edge member is coupled to an adjacent concrete floor deck. The edge member is further configured to have a junction formed between the edge member and the adjacent edge member to define a channel. The edge member is further configured to have a binder material placed in the channel to form a joint between the concrete floor deck and the adjacent concrete floor deck.

Abstract: 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.

Abstract: A bridge superstructure comprises a first aspect of the present invention, a bridge structure comprises a contact surface supported by a decking mounted on a superstructure. The superstructure includes a mounting for the decking. The decking comprises a panel composed of a fiber reinforced polymer composite, the panel comprising a plate having an upperside and an underside, a plurality of first and second beams, each beam having an upper face and a base face and side faces, the upper face of each beam being integral with the underside of the plate, a first beam having an aperture extending between the side faces, wherein a second beam extends through the aperture. The panel further comprises means for attachment to the superstructure and a layer of wear-resistant material on the upper side of the plate.

Abstract: A structural system comprised of prefabricated deck units spaced along longitudinal load-carrying members with tensioned structural elements, typically anchored in longitudinal load-carrying members, which produce longitudinal axial compression in these units. During construction, prefabricated deck units are erected on top of and supported by the longitudinal load-carrying members via leveling devices. Leveling devices permit relative motion between the longitudinal load-carrying members and the prefabricated deck units, except at two ends of a structural unit, where deck connection units are connected to longitudinal members. In the longitudinal direction, each girder line contains more than one girder or girder segment and the girders or girder segments are not continuous during tensioning. The girder support allows the girder or girder segments to move in the longitudinal direction.

Abstract: A composite floor panel includes a frame assembly having a base plate, a plurality of first lateral supports secured to the base plate, and a plurality of second lateral supports secured to the base plate. The first lateral supports lie in a first plane and the second lateral supports lie in a second plane. The first plane and the second plane each intersect the base plate and the first plane is disposed at an angle relative to the second plane. The composite floor panel also includes a concrete portion coupled to and supported by the first lateral supports and the second lateral supports.

Abstract: A structural system comprised of prefabricated deck units spaced along longitudinal load-carrying members, which produce longitudinal axial compression in deck units by tensioning the longitudinal load-carrying members without the use of standard post-tensioning details. During construction, prefabricated deck units are erected on top of and supported by the longitudinal load-carrying members via leveling devices, which also permit relative motion between the longitudinal load-carrying members and the prefabricated deck units. Jacking apparatuses are used to introduce deck compression by jacking against the longitudinal load-carrying members. This system can be used for new structures and for deck replacement of existing structures.

Abstract: An example method of expanding a highway have a multiple lanes passing under a highway overpass bridge having a center pier is described. The center pier may be between lanes passing in opposite directions. The center pier may be replaced with two replacement central piers having a gap there between. Additional lanes may be added through the gap between the replacement central piers. Various methods of construction and detailed designs for such bridges are also described.

Abstract: The invention relates to a span (2) for railway tracks with a self-supporting U-shaped structure (3), defining a section of the path for a piece of rolling stock (1), travelling on the railway track and at least one further element (6, 10, 11, 14) for the travel of the rolling stock (1) on the railway track and which can support, guide and/or supply the rolling stock (1). According to the invention, at least one (6) of the additional elements (6, 10, 11, 14) is directly integrated in the U-shaped element (3).

Abstract: A precast composite flooring system utilizes girders and floor panels having steel lower structures placed in tension and concrete upper structures places in compression. Openings through a stem wall allow ducts, pipes, and conduits to be run therethrough. The system provides reduced weight over conventional precast or pour in place systems, allowing further reduction in the weight and size of other building components. The floor deck does not use tensioning strands, allowing openings to be formed at nearly any stage of construction and with reduced concern over cutting steel reinforcement. The floor panels and girders bolt together and bolt to a steel column frame, allowing for more efficient assembly.

Abstract: A bridge supports any desired loading capacity to cross rivers, ravines, highways, wetlands, and other areas where traffic or pedestrians conveniently access the opposite side. The structure is assembled in a number of ways at the bridge site, using smaller equipment and less time than is normally required. The prefabricated and trial fitted elements can be assembled at ground level and the structure can be launched on rollers across the area that is to be crossed, or can be assembled sequentially from one or both sides. The structure includes two or more box girders supporting the bridge deck which is integrated into the structure. The upper portion of the girders form the side barriers of the bridge and the deck with integrated cross members is fastened to the lower portion of the girders, both of which are sized to accommodate the load bearing capacity of the traffic using the structure.

Abstract: The present invention is directed to a precast girder that is used as the outer-most lateral girder in a bridge superstructure. In one embodiment, the girder is comprised of a first flange, a second flange that is separated from the first flange, and a web that connects the first flange to the second flange so that the resulting combination of the first flange, second flange, and web generally has an I-beam cross-section. The girder further includes an edge portion that is connected to the second flange and extends away from the first and second flanges.

Abstract: A handrail construction, such as for a bridge or stairway, includes a tubular handrail element, the cross section of which is defined by a closed tube wall which encloses an internal cavity, and also a series of supports fastened to the handrail element. At least one counterpiece is located in the interior of the handrail element. Each support is fastened to a counterpiece via a fastening element which protrudes through the tube wall of the handrail element. The handrail element includes a thermosetting material.

Abstract: Apparatus and methods are disclosed that are useful for robotic gantry systems that are lightweight while at the same time offering rigidity or stiffness for implementation in Contour Crafting construction and material delivery techniques. The present disclosure is directed to robotic gantry system and material transport apparatus that use of very light structural members that have sufficient compressive strength, but which may otherwise be weak in the presence of bending forces, in conjunction with cables that provide stiffness against bending. Use of such cables provides needed tension while at the same time allowing the robotic gantry system to be very light compared to solid structures, e.g., those with I-beams, etc. Material delivery systems including passive articulated arms are also disclosed.

Abstract: An improved prestressed concrete bridge having internal and external tensioning tendons which follow approximately similar pathways which are not straight.

Abstract: Modular plastic structural composites having a web section disposed along a horizontal axis and at least one flange section disposed along a horizontal axis parallel thereto and integrally molded to engage the top or bottom surface of the web section, wherein said composite is formed from a mixture of (A) high density polyolefin and (B) a thermoplastic-coated fiber material, poly-styrene, or a combination thereof. Composites molded in the form of I-Beams and bridges constructed therefrom are also disclosed.

Abstract: The present invention provides a rigid connection structure of a bridge pier and a concrete girder capable of drastically reducing bridging cost and reducing total quantity of steel material to be used compared to a rigid-frame bridge using steel girders and capable of flexibly forming concrete girders into a shape corresponding to a bridging site without shape restriction for steel girders.

Abstract: Provided are a connection apparatus and a connection method capable of rapidly and fixing a pre-cast deck slab with a beam. The connection apparatus includes a main body buried in the pre-cast deck slab and having a hollow part formed in an axial direction thereof! a plurality of support portions integrally formed with an outer surface of the main body, each of which has a body having a certain length and a hook integrally formed with an end of the body; a bolt having a bolt body inserted into the hollow part of the main body and a fixing hole of the beam, and a head integrally formed with an upper end of the bolt body! and a nut threadedly engaged with the bolt body of the bolt.

Abstract: An enhancing mechanism to be placed primarily below the neutral axis of a girder is presented. The movement and deflection of the girder causes the enhancing mechanism to alter the bending moment distribution of the girder. The mechanism is configured so that when combined with the girder, the overall dimensions of the combined system is not much bigger than the dimensions of the girder alone. A tension member may be incorporated into the lower boundary of the enhancing mechanism, and connections are used to attach the mechanism to the girder below the neutral axis. The girder and the enhancing mechanism may be made of the same material or different materials. The compression forces developed in the long diagonal members of the enhancing mechanism become a reaction at the girder end points. A direct connection of the long diagonal members to support points load shear directly to the end supports.

Abstract: Provided is a hollow prestressed concrete girder for forming an I-type prestressed concrete girder bridge, in which at least one hole is formed in a body portion of the I-type prestressed concrete girder.

Abstract: A structural support system employs a modified inverted box girder design for improved performance and ease of fabrication. Each girder of a series of girders is formed with an upper flange section, a set of web sections extending from opposite lateral sides of the upper flange section, and a base section below the web sections. The base section includes individual flanged footings that project generally towards one another. The particular cross-sectional configuration of each girder may be formed by bending a continuous steel plate along at least a first set of preselected parallel lines to establish a set of upper continuous transitional bends with the upper flange section therebetween, as well as a remainder portion forming at least the set of web sections. A deck is coupled with the series of girders to form the structural support system.

Abstract: The present invention is directed to an apparatus for use in constructing a bridge comprised of a superstructure and a substructure that supports the superstructure and is comprised of foundations and piers. In one embodiment, the apparatus is comprised of a truss structure, a trolley that is supported by the truss structure and used to move materials used to build the bridge along at least a portion of the truss, a support structure for supporting the truss structure, and rotatable lead that can receive a substructure related element from the trolley and be used to rotate the element to a desired position to further the construction of the bridge.

Abstract: A blast protective barrier system, termed a blast wall, providing a security perimeter or boundary at and above a ground level definable in terms of an x, y, z coordinate system, includes several substantially ground level (xy plane) pile caps, each itself having a y-axis elongate length, a x-axis width, and a z-axis depth, the x-axis substantially defining the width of the barrier system. Each pile cap also includes an upper and lower xy plane surface, each of the upper surfaces including y-axis channels and each of the lower surfaces including several recesses. The system also includes a first, second and further modules having a plurality of opposing pairs of yz plane, the y-axis elongate concrete panels including opposing integral xz end cap elements having a high shock-absorptive structure for isolating each module from the effect of a blast upon an adjacent module.

Abstract: A bridge system comprised of prefabricated deck units spaced along longitudinal load-carrying members. Tensioned structural elements are external to a plurality of the prefabricated deck units and produce longitudinal axial compression in these units. The tensioned structural elements can be deviated relative to the horizontal plane of the prefabricated deck units, subsequently enhancing the load-carrying capacity of the longitudinal load-carrying members. Leveling devices that permit relative motion between the longitudinal load-carrying members and the prefabricated deck units are provided. The leveling devices allow for the tensioned structural elements to provide longitudinal compression to the prefabricated deck units independent of the longitudinal load-carrying members.

Abstract: An enhancing mechanism to be placed primarily below the neutral axis of a girder is presented. The movement and deflection of the girder causes the enhancing mechanism to alter the bending moment distribution of the girder. The mechanism is configured so that when combined with the girder, the overall dimensions of the combined system is not much bigger than the dimensions of the girder alone. A tension member may be incorporated into the lower boundary of the enhancing mechanism, and connections are used to attach the mechanism to the girder below the neutral axis. The girder and the enhancing mechanism may be made of the same material or different materials. The compression forces developed in the long diagonal members of the enhancing mechanism become a reaction at the girder end points. A direct connection of the long diagonal members to support points load shear directly to the end supports.

Abstract: A doubly prestressed roof-ceiling construction with grid flat soffit for extremely large-span is a prefabricated element intended for assembling roofs of extremely large-span buildings with a flat soffit. The construction includes a grid soffit construction and an upper concrete girder of a modified “T” shape or of an inverse “V”-shaped cross section, interconnected by slender steel pipe-rods that stabilize the upper girder against lateral buckling. The empty openings within elements of the horizontal grid are fulfilled with plates wherewith a flat soffit is achieved. The construction is prestressed by the double prestressing. The grid-soffit is prestressed centrically and the upper girder is prestressed by a wedge at the midspan.

Abstract: Light, self-supporting precast slab that can be quickly assembled on prefabricated girders of the type used in the construction of viaducts, bridges and similar constructions, characterized by projections located in the bottom part to increase the effective edge, thereby giving the bridge larger spans and enabling the installation inside the girder of conduits or pipes with large diameters, enabling it to be handled and transported by road in compliance with current legislation regulating the transporting of large loads. The present invention contributes the major advantage of providing the bridge with larger spans and the possibility of installing conduits or pipes of a larger diameter than the height of the girder on large bridges or viaducts, thereby enabling it to be fitted quickly and the precast slabs to be safely and simply assembled on the girders, while at the same time reducing the weight of the unit through a reduced cross-section, making it easier to transport and fit.

Abstract: A floor structure comprises a plurality of steel beams 4 arranged in parallel, each steel beam 4 including 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 2. 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 beams 4 so as to inhibit the steel beams 4 from displacing downward.

Abstract: A floor structure comprises a plurality of steel beams 4 arranged in parallel, each steel beam 4 including 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 2. 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 beams 4 so as to inhibit the steel beams 4 from displacing downward.