Floor slab joint structure

Abstract

To provide a floor slab joint structure capable of improving bending yield strength and shear load-bearing capacity in each corner part of each floor slab installed so as to be adjacent to each other via a joint.SOLUTION: A floor slab joint structure is constituted by installing square plate-shaped reinforced-concrete floor slabs 10 on a girder so as to be adjacent via joints in a bridge axial direction and a bridge axial perpendicular direction of a bridge, and by filling filling material in the joints, and includes a reinforcing part 9 that reinforces corner parts of four floor slabs 10, 10... arranged so as to be adjacent to each other through joints having a cross-shaped cross section crossing the bridge axial direction and the bridge axial perpendicular direction of the bridge, the reinforcing part 9 being provided with a reinforcing plate 96 having the cross-shaped cross section installed in the joints having the cross-shaped cross section.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a deck slab joint structure for connecting adjacent deck slabs for bridges. [Background technology]

[0002] A known deck joint structure is one in which rectangular reinforced concrete deck slabs are installed on girders so that they are adjacent to each other along the bridge axis direction with joints in between, and adjacent deck slabs along the bridge axis direction are connected using deck joint devices, and the joints are filled with a filler material (see Patent Document 1). In addition, a deck joint structure is known in which rectangular plate-shaped reinforced concrete deck slabs are installed on girders so that they are adjacent to each other via joints in the bridge axis direction and in the direction perpendicular to the bridge axis, and adjacent deck slabs along the bridge axis direction are connected using deck joint devices, and adjacent deck slabs along the direction perpendicular to the bridge axis are connected using deck joint devices, and the joints are filled with filler material (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-159233 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-177767 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned deck joint structure, no reinforcing bars or steel materials are provided at the corners of each deck slab, which are installed adjacent to each other through joints, or in the vicinity of those corners, and only a filler material such as mortar is provided in the joints between the corners. Therefore, at each corner of each deck slab, which is installed adjacent to each other with joints in between, the shear force caused by wheel load is resisted by the adhesive force between the concrete at the corner of the deck slab and the filler filled in the joints, which could lead to punching shear failure due to fatigue at each corner of each deck slab. The present invention provides a deck slab joint structure that can improve the bending strength and shear load-bearing capacity at each corner of each deck slab installed adjacent to each other via joints. [Means for solving the problem]

[0005] The deck joint structure of the present invention is a deck joint structure in which rectangular plate-shaped reinforced concrete decks are installed on girders so that they are adjacent to each other via joints in the bridge axis direction of the bridge and in the direction perpendicular to the bridge axis, and the joints are filled with filler, and is characterized in that it is provided with a reinforcing section that reinforces each of the opposing corners of the four decks arranged adjacent to each other via cross-sectional joints that intersect the bridge axis direction of the bridge and the direction perpendicular to the bridge axis, and the reinforcing section is provided with a cross-sectional reinforcing plate installed in the cross-sectional joint. Furthermore, the reinforcing plate having a cross-shaped cross section is characterized in that it is installed so that the cross intersection position of the reinforcing plate coincides with the cross intersection position of the cross-shaped joint, and so that the plate surfaces of the four plates of the cross of the reinforcing plate face the edge surfaces of each of the opposing corner portions of the four deck slabs. The reinforcing portion is characterized by having recesses at each corner of the four deck slabs that extend from one edge surface to the other edge surface near adjacent corners, with the corners as the boundary, and a filler material filled into each recess. The deck joint structure according to the present invention is a deck joint structure in which rectangular reinforced concrete decks are installed on girders so as to be adjacent to each other via joints in the bridge axis direction and in the direction perpendicular to the bridge axis, and the joints are filled with a filler, and the structure is provided with reinforcing parts that reinforce each of the opposing corners of the two decks installed adjacent to each other via joints along the direction perpendicular to the bridge axis, and the reinforcing parts are provided at each of the opposing corners of the two decks and on the edge surface of one deck that is adjacent to each other via a joint along the bridge axis direction of the bridge. The reinforcing plate has a cross-sectional shape installed in a T-shaped cross-sectional joint formed by a recess, the joints between the opposing corners of the two deck slabs, and the joints between the opposing corners of the two deck slabs and the edge surface of one deck slab, and a filler filled in the recess, and is characterized in that the reinforcing plate with a cross-sectional shape is installed so that the plate surfaces of three plates of the reinforcing plate face the edge surfaces of the corners of the two deck slabs, and so that one of the remaining plates of the cross of the reinforcing plate is positioned within a recess provided in the edge surface of one deck slab. The reinforcing portion is characterized in that it comprises recesses at each of the opposing corners of the two deck slabs, extending from one edge surface to the other edge surface near the adjacent corner edges, with the corner edges as the boundary, and a filler material filled into each recess. The reinforcing plate is characterized by having through holes penetrating the plate surface. The reinforcing plate is characterized by having irregularities on the plate surface. The bridge is also characterized in that at least one of the deck slabs adjacent to each other in the bridge axis direction via joints and the deck slabs adjacent to each other in the direction perpendicular to the bridge axis via joints are connected by a joint. According to the deck joint structure of the present invention, it is now possible to provide a deck joint structure that can improve the bending strength and shear load-bearing capacity at each corner of each deck installed adjacent to each other through joints. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a plan view showing a deck slab joint structure for a bridge (first embodiment). [Figure 2]An enlarged plan view of the main part (embodiment 1) showing the corner assembly and reinforcement where the corners of four deck slabs are adjacent. [Figure 3] FIG. 1 is a perspective view showing a corner portion of a deck slab (embodiment 1). [Figure 4] 1A and 1B show an example of a deck slab joint device, in which FIG. 1A is an exploded perspective view of the deck slab joint device, and FIG. 1B is a perspective view of the deck slab joint device (first embodiment). [Figure 5] 1A and 1B show an example of a deck slab joint device, in which FIG. 1A is an exploded perspective view of the deck slab joint device, and FIG. 1B is a perspective view of the deck slab joint device (first embodiment). [Figure 6] 1A to 1D are diagrams showing a reinforcing material, in which (a) is a plan view, (b) is a side view, (c) is a front view, and (d) is a perspective view (Embodiment 1). [Figure 7] 4A and 4B are diagrams showing a reinforcing portion, in which (a) is an enlarged plan view, and (b) is a diagram showing the installation state of the reinforcing plate when viewed from direction A in (a) (Embodiment 1). [Figure 8] 1(a) is a plan view showing a deck joint structure for a bridge, and FIG. 1(b) is an enlarged plan view of the main part showing the reinforcing part provided at the corner assembly part of FIG. 1(a) (Embodiment 2). [Figure 9] (a) is a plan view showing a deck joint structure for a bridge, (b) is an enlarged plan view of the key parts showing the recess in the deck joint structure perpendicular to the bridge axis in (a), and (c) is a front view showing the recess in the deck joint structure perpendicular to the bridge axis in (a) (embodiment 5). DETAILED DESCRIPTION OF THE INVENTION

[0007] Embodiment 1 As shown in Figures 1 and 2, the deck joint structure according to the first embodiment is configured such that four rectangular, plate-shaped, reinforced concrete deck slabs 10 are installed on girders (not shown) so as to be adjacent to each other in the bridge axis direction X and the bridge axis transverse direction Y via joints 16, 15, and adjacent deck slabs 10, 10 along the bridge axis direction X are connected to each other using deck slab joint devices 1A as joints, and adjacent deck slabs 10, 10 along the bridge axis transverse direction Y are connected to each other using deck slab joint devices 1 as joints, and the joints 16, 15 are filled with a filler (joint material). The deck joint structure is provided with reinforcing portions 9 that reinforce each of the opposing corners of the four deck slabs 10, 10, 10 arranged adjacent to each other via cross-sectional joints formed by the joints 16, 15 that intersect the bridge axis direction X and the bridge axis transverse direction Y of the bridge. The filler may be mortar, concrete, adhesive, etc. Hereinafter, the filler will be referred to as the same. In other words, for example, the lower right corner of the deck slab 10 at the upper left of Figure 1, the lower left corner of the deck slab 10 at the upper right of Figure 1, the upper right corner of the deck slab 10 at the lower left of Figure 1, and the upper left corner of the deck slab 10 at the lower right of Figure 1 are adjacent to each other via filler filled in joints 16, 15 to form a corner assembly 10C, and this deck slab joint structure has a reinforcing part 9 at the corner assembly 10C.

[0008] The reinforced concrete deck 10 is, for example, a deck containing reinforcing bars, PC steel wires, or steel material, or two or more of the reinforcing bars, steel material, and PC steel wires. The corner portion refers to a portion in the vicinity of a corner edge 10E of the quadrangular plate-shaped deck 10, as shown in FIG.

[0009] Next, the deck slab joint device 1 as a joint will be described in detail with reference to FIG. The deck joint device 1 is a deck joint device for connecting one deck 10 and another deck 10 that are installed adjacent to each other on the girder of a bridge, and is a deck joint device that is configured, for example, with one support member 2 as a joint component such as a C-shaped metal that is provided on one deck 10, the other support member 2 as a joint component such as a C-shaped metal that is provided on the other deck 10, and a connecting member 3 such as an H-shaped metal that connects these support members 2, 2.

[0010] The receiving member 2 has an engaged portion 5 as a joint functional portion having an engaging recess 4, and an anchoring portion 6 that is anchored to the concrete of the deck slab 10 in order to anchor the engaged portion 5 to the concrete of the deck slab 10.

[0011] The connecting member 3 has one engaging portion 7 that engages with the engaging recess 4 of one of the receiving members 2, the other engaging portion 7 that engages with the engaging recess 4 of the other receiving member 2, and a connecting portion 8 that connects the one engaging portion 7 and the other engaging portion 7. The material of the connecting member 3 is not particularly limited, but for example, it may be made of a one-piece molded product such as steel, in which cast iron is poured into a formwork not shown in the figure, and one engaging portion 7, the other engaging portion 7, and the connecting portion 8 are molded into one piece.

[0012] The engaged portion 5 comprises a front wall portion 52, a left wall portion 53L extending rearward from the left end of the front wall portion 52, a right wall portion 53R extending rearward from the right end of the front wall portion 52, a bottom portion 51 extending rearward from the lower end of the front wall portion 52, and a rear wall portion 54 extending from the rear ends of the bottom portion 51, the left wall portion 53L, and the right wall portion 53R, and is configured with an upper-opening engaging recess 4 surrounded by the front wall portion 52, the left wall portion 53L, the right wall portion 53R, the bottom 51, and the rear wall portion 54. In this specification, the terms up, down, left, right, front, and rear are defined as directions shown in FIGS.

[0013] In other words, the engaged portion 5 comprises a bottom 51, a rear wall 54 rising from the rear edge side of the bottom 51, a left wall 53L and a right wall 53R extending from both the left and right sides of the rear wall 54 and rising from the left and right edges of the bottom 51, and a front wall 52 extending from the extended ends (front ends) 53e, 53e of the left wall 53L and the right wall 53R and rising from the front edge side of the bottom 51.

[0014] The engaged portion 5 has an upper opening facing the bottom 51 and an engaging portion insertion opening 41 (upper opening of the engaging recess 4) which serves as an insertion port for inserting the engaging portion 7 of the connecting member 3 into the engaging recess 4, and the front wall portion 52 has a connecting portion insertion groove 42 which serves as an insertion groove of the upper opening for inserting the connecting portion 8 of the connecting member 3. The opening 41 for inserting the engagement portion is an upper opening surrounded by the upper end of the front wall portion 52, the upper end of the left wall portion 53L, the upper end of the right wall portion 53R, and the upper end of the rear wall portion 54, and is formed by an opening that allows the engagement portion 7 of the connecting member 3 to be inserted into the engagement recess 4 from above. The front wall portion 52 is a wall body having a front wall surface 52a that is exposed to the edge surface 11 when the receiving member 2 is installed on the edge surface 11 side of the deck slab 10, and has the above-mentioned connecting portion insertion groove 42 for inserting the connecting portion 8 of the connecting member 3. The edge surface 11 of the deck slab 10 is the surface surrounded by the corner edge 10E of the deck slab 10, the edge 11a of the upper surface of the deck slab 10, and the edge 11b of the lower surface of the deck slab 10, as shown in Figure 3, in other words, the side surface of the deck slab 10. The groove 42 for inserting the connecting part is an upper-opening groove that extends continuously in the vertical direction from the upper end side of the front wall part 52 to the bottom part 51 side in the central part between the left and right sides of the front wall part 52, and is formed with a groove width that is spaced so that the connecting part 8 of the connecting member 3 can be inserted from above.

[0015] The fixing unit 6 includes a left fixing unit 6L and a right fixing unit 6R. The left fixing portion 6L includes upper and lower fixing members 60, 60 that extend rearward from a left-side extended front wall portion 55L that serves as a connecting portion that protrudes leftward from the left end of the front wall portion 52 of the engaged portion 5. That is, the upper and lower fixing members 60, 60 that constitute the left fixing portion 6L are arranged to extend rearward from the rear surface 55b of the left-side extended front wall portion 55L, which serves as a connecting portion with the engaged portion 5, passing beside the outer surface 53f of the left wall portion 53L. The right fixing portion 6R includes upper and lower fixing members 60, 60 that extend rearward from a right-side extended front wall portion 55R serving as a connecting portion that protrudes rightward from the right end of the front wall portion 52 of the engaged portion 5. That is, the upper and lower fixing members 60, 60 that constitute the right fixing portion 6R are provided so as to extend rearward from the rear surface 55b of the right-side extended front wall portion 55R, which serves as a connecting portion with the engaged portion 5, passing beside the outer surface 53f of the right wall portion 53R. In other words, when the receiving member 2 is installed on the edge surface 11 side of the deck slab 10, the left and right fixing portions 6L, 6R are each composed of upper and lower fixing members 60, 60 arranged at a predetermined interval in the thickness direction of the deck slab 10. The anchoring member 60 is made of a steel material such as a reinforcing bar having a protrusion on the outer periphery of a rod-shaped body having a circular cross section.

[0016] That is, the receiving member 2 has a left-side extended front wall portion 55L and a right-side extended front wall portion 55R as connecting portions connecting the engaged portion 5 and the fixed portion 6, and is configured so that the left fixed portion 6L and the front wall portion 52 of the engaged portion 5 are integrated via the left-side extended front wall portion 55L, and so that the right fixed portion 6R and the front wall portion 52 of the engaged portion 5 are integrated via the right-side extended front wall portion 55R. Furthermore, the left-side extended front wall portion 55L is arranged to protrude to the left from the entire area between the top and bottom of the left end of the front wall portion 52, and the right-side extended front wall portion 55R is arranged to protrude to the right from the entire area between the top and bottom of the right end of the front wall portion 52.

[0017] The material of the receiving member 2 is not particularly limited, but for example, it is made of a one-piece molded product such as steel, in which cast iron is poured into a formwork not shown in the figure, and the engaging portion 5, the connecting portion which is the left-side extended front wall portion 55L and the right-side extended front wall portion 55R, and the fixing portion 6 are molded as one piece. In the case of a receiving member 2 constructed as an integrally molded product, the upper and lower fixing members 60, 60 constituting the left fixing portion 6L are integrally molded with the left extended front wall portion 55L and are arranged so as to protrude rearward from the rear surface 55b of the left extended front wall portion 55L and extend rearward, passing alongside the outer surface 53f of the left wall portion 53L, while the upper and lower fixing members 60, 60 constituting the right fixing portion 6R are integrally molded with the right extended front wall portion 55R and are arranged so as to protrude rearward from the rear surface 55b of the right extended front wall portion 55R and extend rearward, passing alongside the outer surface 53f of the right wall portion 53R.

[0018] The engaging portion 7 of the connecting member 3 is configured, for example, to have an outer peripheral wall facing the inner peripheral wall of the engaging recess 4, and is provided with a fixing portion 72 having an outer wall surface 71 on the front surface of the rear wall portion 54 facing the rear inner wall surface of the engaging recess 4 and the left and right inner wall surfaces of the engaging recess 4, which are the inner surfaces of the left and right wall portions 53L, 53R, and a wall portion 74 having an inner wall surface 73 facing the front inner wall surface 52b of the engaging recess 4 on the rear surface of the front wall portion 52. The fixing portion 72 of the engaging portion 7 is formed with a bolt insertion hole 75 for fixing the fixing portion 72 to the bottom portion 51 of the engaged portion 5 with a fixing means such as a bolt (not shown). It should be noted that the fixing portion 72 and the bolts used as fixing means may not be used. For example, the configuration may be such that the engaging portion of the connecting member and the engaged portion of the receiving member are fixed by using, as a fixing means, a wedge-shaped fitting member (not shown) that is fitted between the front inner wall surface of the engaging recess of the engaged portion and the inner wall surface of the wall portion of the engaging portion of the connecting member; in short, any configuration is acceptable as long as it is possible to fix the engaging portion of the connecting member and the engaged portion of the receiving member.

[0019] Next, the deck slab joint device 1A as a joint will be described with reference to FIG. The deck joint device 1A may be a deck joint device having a different configuration of the fixing part compared to the above-mentioned deck joint device 1, such as one having the same configuration as the deck joint device disclosed in Patent Document 1. The deck joint device 1A, like the above-mentioned deck joint device 1, is a deck joint device for connecting one deck slab 10 and another deck slab 10 that are installed adjacent to each other on the girder of a bridge, and is a deck joint device that is configured, for example, with one receiving member 2A as a joint component such as a C-shaped metal that is provided on one deck slab 10, the other receiving member 2A as a joint component such as a C-shaped metal that is provided on the other deck slab 10, and a connecting member 3A such as an H-shaped metal that connects these receiving members 2A, 2A. The receiving member 2A is configured to include an engaged portion 5A having an engaging recess 4, and an anchoring portion 6A that is anchored to the concrete of the deck slab 10 in order to anchor the engaged portion 5A to the concrete of the deck slab 10. The connecting member 3A has one engaging portion 7 that engages with the engaging recess 4 of one receiving member 2A, the other engaging portion 7 that engages with the engaging recess 4 of the other receiving member 2A, and a connecting portion 8 that connects the one engaging portion 7 and the other engaging portion 7. The engaged portion 5A comprises a front wall portion 52, a left wall portion 53L extending rearward from the front wall portion 52, a right wall portion 53R extending rearward from the front wall portion 52, a bottom portion 51 extending rearward from the front wall portion 52, and a rear wall portion 54 extending from the rear ends of the bottom portion 51, the left wall portion 53L, and the right wall portion 53R, and is configured with an upper-opening engaging recess 4 surrounded by the front wall portion 52, the left wall portion 53L, the right wall portion 53R, the bottom 51, and the rear wall portion 54. The fixing portion 6A is configured, for example, by comprising two fixing members 60A, 60A such as fixing reinforcements protruding from the left and right end sides of the rear surface of the rear wall portion 54 of the engaged portion 5A and spaced apart in a direction (horizontal (left and right) direction) H along the plate surface of the deck slab 10, and an end connecting member 60B connecting the ends of these fixing members 60A, 60A. Furthermore, as described above, the receiving member 2A has the fixing members 60A, 60A arranged rearward of the rear wall portion 54, and there are no fixing members on the outer surface side of the left wall portion 53L and the outer surface side of the right wall portion 53R of the receiving member 2A, so the adhesion force between the left wall portion 53L and the right wall portion 53R of the receiving member 2A and the concrete of the deck slab 10 is small.Therefore, in order to increase the adhesion force between the left wall portion 53L and the right wall portion 53R of the receiving member 2A and the concrete of the deck slab 10, a number of uneven portions 59, 59... are provided on the outer surfaces of the left wall portion 53L and the right wall portion 53R of the receiving member 2A. Furthermore, by providing the uneven portions 59, 59, the punching shear resistance can be improved.

[0020] The receiving members 2A, 2A of the deck joint device 1A are formed, for example, from a one-piece molded product in which the engaged portion 5A and the fixing portion 6A are molded integrally by pouring cast iron into a formwork, and the connecting member 3A is formed, for example, from a one-piece molded product in which the pair of engaging portions 7, 7 and the connecting portion 8 are molded integrally by pouring cast iron into a formwork. In the deck slab joint device 1A in Fig. 5, the same or corresponding parts as those in the deck slab joint device 1 in Fig. 4 are given the same reference numerals and detailed explanations thereof are omitted. That is, in the deck slab joint device 1A in Fig. 5, other than 2A, 3A, and 5A, the members given the same reference numerals as those in the deck slab joint device 1 in Fig. 4 have the same or corresponding configurations as those explained in the deck slab joint device 1 in Fig. 2, and therefore detailed explanations thereof are omitted. That is, as the deck slab joint device 1A, a deck slab joint device having a configuration similar to that of the deck slab joint device 1 other than the outer shape of the fixing portion 6A and the engaged portion 5A of the receiving member 2A may be used.

[0021] The deck 10 is manufactured, for example, as follows. For example, when manufacturing the deck 10, rebars and the like to be embedded in the deck 10 are placed in a deck forming formwork not shown, and multiple receiving members 2, 2... are placed in predetermined positions in the deck forming formwork so that the front wall surface 52a of the front wall portion 52, left-side extended front wall portion 55L, and right-side extended front wall portion 55R of the engaged portion 5 and the other edge surface 11 of the deck 10 extending in the bridge axis direction X are positioned, for example, on the same plane, and the connecting portion insertion groove 42 and engaging portion insertion opening 41 of the engaging recess 4 are exposed to the outside of the deck 10. In other words, the multiple receiving members 2, 2... are placed at predetermined intervals along the other edge surface 11 of the deck 10 extending in the bridge axis direction X. Similarly, a plurality of receiving members 2A, 2A . . . are arranged at predetermined intervals along one edge surface 11 of the deck slab 10 that extends in the direction Y perpendicular to the bridge axis. Furthermore, within the deck slab forming formwork, a core, for example, is placed at a position where a recess 90 and a filler injection port 91 that constitute a reinforcing portion 9, which will be described later, are to be formed. Thereafter, concrete is poured into the deck forming formwork and allowed to harden, thereby completing the deck slab 10, which has a plurality of receiving members 2A, 2A... spaced at a predetermined interval along one edge surface 11, and a plurality of receiving members 2, 2... spaced at a predetermined interval along the other edge surface 11, and has recesses 90 and filler injection ports 91 formed at the corners. That is, a plurality of receiving members 2, 2... are installed in the deck slab forming formwork so that the front wall surface 52a of the front wall portion 52 of the engaged portion 5, the groove 42 for inserting the connecting portion of the engaging recess 4, the opening 41 for inserting the engaging portion, and the engaging recess 4 are exposed to the outside, and the other portions of the engaged portion 5 and the fixing portion 6 are embedded in the concrete of the deck slab 10, and a plurality of receiving members 2A, 2A... are also installed, and after a core is installed in a position where the recess 90 is to be formed, concrete is poured into the deck slab forming formwork and allowed to harden, thereby forming a deck slab 10 in which the receiving members 2A, 2A... are installed on one side of the edge surface 11 and the receiving members 2, 2... are installed on the other side of the edge surface 11, and which has a recess 90 and a filler injection port 91 at the corner portion.

[0022] In other words, the receiving member 2 is fixed to the concrete of the deck slab 10 by an anchoring portion 6 which has a plurality of anchoring members 60, 60 arranged at intervals in the thickness direction (vertical direction) V of the deck slab 10 and a plurality of anchoring members 60, 60 arranged at intervals in the direction (horizontal (left-right) direction) H along the plate surface of the deck slab 10. In other words, the fixing portion 6 of the receiving member 2 that is fixed to the concrete of the deck slab 10 is configured to have two sets of two upper and lower fixing members 60, 60 arranged at a predetermined distance in the thickness direction (up and down direction) V of the deck slab 10, and two sets of two left and right fixing members 60, 60 arranged at a predetermined distance in the direction H along the board surface of the deck slab 10, in other words, two sets of two left and right fixing members 60, 60 arranged at a predetermined distance in the direction H along the board surface of the deck slab 10, and two sets of two left and right fixing members 60, 60 arranged at a predetermined distance in the thickness direction V of the deck slab 10. In addition, the receiving member 2A is fixed to the concrete of the deck slab 10 by an anchoring portion 6A which comprises anchoring members 60A, 60A such as two anchoring reinforcements arranged at a distance in the direction (horizontal (left-right) direction) H along the plate surface of the deck slab 10 and an end connecting member 60B.

[0023] The deck joint structure in which the above-mentioned deck slabs 10 are installed on the girders so that they are adjacent to each other in the bridge axis direction X and the direction perpendicular to the bridge axis Y of the bridge via joints 16, 15, and the deck slabs 10, 10... are connected to each other by deck joint devices, is as follows. For example, as shown in Figures 1 and 2, one receiving member 2A of a deck joint device 1A provided on one edge surface 11 of one adjacent deck slab 10 along the bridge axis direction X of the bridge and the other receiving member 2A of the deck joint device 1A provided on one edge surface 11 of the other deck slab 10 are connected by a connecting member 3A. Furthermore, one receiving member 2 of the deck joint device 1 provided on the other edge surface 11 side of one adjacent deck slab 10 along the direction Y perpendicular to the bridge axis of the bridge and the other receiving member 2 of the deck joint device 1 provided on the one edge surface 11 side of the other deck slab 10 are connected by a connecting member 3.

[0024] In other words, the edge surfaces 11, 11 of adjacent deck slabs 10, 10, 10, 10 are arranged adjacent to each other with gaps that form joints 16, 15, and then the adjacent deck slabs 10 are connected using deck slab joint devices 1, 1A to form a corner collection portion 10C.Furthermore, a reinforcing portion 9 of the corner collection portion 10C is formed, and the deck slab joint structure between adjacent deck slabs 10 and 10 is completed by filling in the joints 16, 15 above the deck slab joint devices 1, 1A and between the edge surfaces 11, 11 of each adjacent deck slab 10, 10.

[0025] That is, when half-section construction (lane-specific deck replacement work) is carried out using the above-mentioned deck slab 10, as shown in Figure 1, for example, a one-phase construction is carried out in which the deck slabs 10, 10... for travel lane D are lined up and connected along the bridge axis direction (vehicle travel direction) X. In this first phase of construction, each receiving member 2A, 2A, which is arranged so as to face each other on the opposing edge surfaces 11, 11 of adjacent deck slabs 10, 10, is connected by a connecting member 3A via a joint 16 along the bridge axis direction X (see Figure 2). That is, the engaging portions 7, 7 of the connecting member 3A are inserted into the engaging recesses 4, 4 from above the engaging recesses 4, 4 of the engaged portions 5A, 5A of the opposing receiving members 2A, 2A through the engaging portion insertion openings 41 at the top of the engaging recesses 4, 4, and the connecting portions 8 of the connecting member 3A are inserted into the connecting portion insertion grooves 42 of the engaging recesses 4, 4, so that the pair of engaging portions 7, 7 are fitted into the engaging recesses 4, 4 (see Figure 5). Furthermore, for example, by inserting a bolt as a fixing means into the bolt insertion hole 75 of the engaging portion 7 fitted into the engaging recess 4, and fastening the bolt into a screw hole (not shown) formed in the bottom 51, the engaging portion 7 of the connecting member 3A and the engaged portion 5A of the receiving member 2A are fixed together. That is, in the one-phase construction, for example, one receiving member 2A described below installed on the edge surface 11 side of one adjacent deck slab 10 along the bridge axis direction X and the other receiving member 2A installed on the edge surface 11 side of the other adjacent deck slab 10 are connected by a connecting member 3A, and thus the one deck slab 10 and the other deck slab 10 arranged adjacent to each other along the bridge axis direction X are connected by a deck slab joint device 1A. As a result of the above, the adjacent deck slabs 10, 10 are connected to each other via the joints 16 along the bridge axis direction X by the deck slab joint device 1A. Then, after the adjacent deck slabs 10, 10 along the bridge axis direction X are connected by the deck slab joint device 1A, filler is filled above the fixed connecting member 3A and filler is filled into the joint 16, which is the gap between the end faces of the adjacent deck slabs 10, 10, thereby completing the deck slab joining structure between the adjacent deck slabs 10, 10. Similarly, the deck slabs 10, 10... for the travel lane D are installed and joined in sequence so as to be adjacent to each other via joints 16 along the bridge axis direction X, thereby completing the first phase of construction.

[0026] After the first phase of construction is completed, a second phase of construction is carried out in which, for example, the deck slabs 10, 10... for the passing lane P are lined up and connected along the bridge axis direction (vehicle travel direction) X. In the second phase of construction, the deck slabs 10 are sequentially lined up in the bridge axis direction X, separated by joints 16, so that they are adjacent to each other in the direction perpendicular to the bridge axis Y, via joints 15 with each of the deck slabs 10, 10 installed in the first phase of construction, and adjacent deck slabs 10, 10 along the bridge axis direction X are connected using, for example, a deck joint device 1A, and the joints 16 between these adjacent deck slabs 10, 10 are filled with filler, thereby completing the deck joint structure between adjacent deck slabs 10, 10 and completing the second phase of construction.

[0027] After the second phase of construction is completed, the deck slabs 10, 10... installed in the first phase of construction and the deck slabs 10, 10... installed in the second phase of construction are connected by, for example, deck slab joint devices 1 (see Figs. 1 and 2). Thereafter, by filling the joints 15 between the deck slabs 10 installed in the first phase of construction and the deck slabs 10 installed in the second phase of construction with filler, the deck joining work between the deck slabs 10, 10... installed in the first phase of construction and the deck slabs 10, 10... installed in the second phase of construction, i.e., the deck joining work between the decks perpendicular to the bridge axis, is completed. In this case, the engaging portions 7,7 of the connecting member 3 are inserted into the engaging recesses 4,4 from above the engaging recesses 4,4 of the engaged portions 5,5 of the opposing receiving members 2,2 through the engaging portion insertion openings 41 at the top of the engaging recesses 4,4, and the connecting portions 8 of the connecting member 3 are inserted into the connecting portion insertion grooves 42 of the engaging recesses 4,4, so that the pair of engaging portions 7,7 are fitted into the engaging recesses 4,4 (see Figure 4). Furthermore, for example, by inserting a bolt as a fixing means into the bolt insertion hole 75 of the engaging portion 7 fitted into the engaging recess 4, and fastening the bolt into a screw hole (not shown) formed in the bottom 51, the engaging portion 7 of the connecting member 3 and the engaged portion 5 of the receiving member 2 are fixed together.

[0028] When carrying out half-section construction, for example, as mentioned above, construction will be carried out in the following order: first phase construction → second phase construction → deck slab joint construction perpendicular to the bridge axis. Furthermore, when carrying out half-section construction, after the first phase of construction, the second phase of construction and the construction of the deck slab joints perpendicular to the bridge axis may be carried out together.

[0029] In other words, when carrying out half-section construction, depending on the situation at the site, construction can be carried out in the following order, as described above: first phase construction → second phase construction → inter-slab joint construction perpendicular to the bridge axis, or, after the first phase construction is completed, construction of the second phase construction and inter-slab joint construction perpendicular to the bridge axis can be carried out together.

[0030] In the half-section construction described above, as shown in Figures 1 and 2, the corners of each of the four deck slabs 10, 10... form adjacent corner assembly portions 10C via cross-sectional joints made up of joints 16, 15 that intersect in the bridge axis direction X and the direction perpendicular to the bridge axis Y of the bridge, so in the deck slab joint structure of embodiment 1, the corner assembly portion 10C is provided with a reinforcing portion 9 in order to improve the bending strength and shear load-bearing capacity of each corner at the corner assembly portion 10C.

[0031] In the deck joint structure according to the first embodiment, the reinforcing portion 9 provided in the corner assembly portion 10C is configured, for example as shown in Figures 2 and 7(a), by including recesses 90, 90, 90, 90 formed in the corners of the four decks 10, 10, 10, 10 that make up the corner assembly portion 10C, a reinforcing plate 96 with a cross-section installed in a cross-sectional joint formed by joints 16, 15 that intersect in the bridge axis direction X and the direction perpendicular to the bridge axis Y at the corner assembly portion 10C, and a filler material filled in the cross-sectional joint and each recess 90,... of each of the four decks 10,...

[0032] As shown in Figure 3, the recess 90 is a recess provided at a corner of the deck slab 10 so as to extend from one edge surface 11 to the other edge surface 11 near adjacent corner edges, with the corner edge 10E as the boundary. In other words, the openings of the recesses 90, 90 of each adjacent deck slab 10, 10 along the bridge axis direction X are configured so that they face each other, and the openings of the recesses 90, 90 of each adjacent deck slab 10, 10 along the direction perpendicular to the bridge axis Y are also configured so that they face each other.

[0033] For example, as shown in FIGS. 3 and 7, the recess 90 is formed so as to extend along one edge surface 11 and the other edge surface 11 of the corner portion of the deck slab 10. In addition, the corners of each deck slab 10 are provided with filler injection ports 91 formed on the edge surface 11 so as to communicate with the recess 90 and the upper surface of the deck slab 10. That is, the filler injection port 91 is formed on the other edge surface 11 that extends along the bridge axis direction X of the deck slab 10. As shown in FIG. 7, the edges of the recess 90 and the filler injection port 91 are formed into inclined surfaces 93 that slope from the wall surfaces of the recess 90 and the wall surfaces of the filler injection port 91 toward the peripheral surface 11 in order to improve the mold release of the core that molds the recess 90 and the filler injection port 91 and to improve the filling of the filler into the recess 90 and the filler injection port 91.

[0034] The reinforcing plate 96 is a reinforcing plate that extends in the vertical direction and has a cross-shaped cross section, and is configured so as to appear cross-shaped when viewed from above or below, that is, a reinforcing plate that has a cross-shaped cross in plan view. In other words, as shown in Figure 6, the reinforcing plate 96 comprises four flat plates 96f, 96p, 96p, and 96r that are arranged to extend in all directions based on a reference line 96c that passes through the intersection point of the cross in the vertical direction, and are formed so that the angle between the plate surfaces of adjacent flat plates is 90°. That is, the reinforcing plate 96 extends in the vertical direction and includes four flat plates 96f, 96p, 96p, and 96r that are spaced apart by 90 degrees from one another in the circumferential direction around a reference line 96c. That is, the reinforcing plate 96 is a plate member that extends in the vertical direction (direction along the reference line 96c) and has a cross-shaped cross section perpendicular to the vertical direction.

[0035] Then, as shown in Figure 7(a), the cross-sectionally reinforcing plate 96 having a cross-section is installed in the cross-sectionally reinforcing joint so that the cross-intersection positions of the reinforcing plate 96 having a cross-section coincide with the cross-intersection positions of the cross-sectionally reinforcing joint, and the plate surfaces of the four flat plates 96f, 96p, 96p, 96r of the reinforcing plate 96 having a cross-section face each edge surface 11 of each of the opposing corner portions of the four deck slabs 10, ... In other words, the reinforcing plate 96 is a component that, when installed in a cross-sectional joint formed in the corner collection portion 10C, is installed so that it appears cross-shaped when viewed from above as shown in Figure 7(a).

[0036] In addition, in embodiment 1, the reinforcing plate 96 is configured, for example, by four flat plates consisting of a front plate 96f, a left plate 96p, a right plate 96p, and a rear plate 96r, and is configured so that the lengths extending in all directions from the reference line 96c are, for example, the front plate 96f, the left plate 96p, and the right plate 96p < the rear plate 96r. In other words, as will be described later, in order to improve ease of installation into the formwork, a reinforcing plate 96 having a cross-shaped cross section is used, in which the extension length of the rear plate 19r, which is the flat plate installed into the formwork, is longer than the extension lengths of the other plates, front plate 96f, left plate 96p, and right plate 96p.

[0037] As shown in FIG. 6, the front plate 96f, the left plate 96p, the right plate 96p, and the rear plate 96r of the reinforcing plate 96 are each formed with a through-hole 96a penetrating the plate surface. By using such a reinforcing plate 96 having the through holes 96a formed therein, it is possible to further improve the bending strength against bending due to the wheel load W and the shear load resistance against shear force.

[0038] The reinforcing plate 96 is manufactured, for example, by molding using a mold or by welding flat plates together.

[0039] Next, an example of a method for constructing the reinforcing portion 9 will be described. For example, in the first phase of construction described above, when filling material is filled into the joints 16 and into each recess 90, 90 of adjacent deck slabs 10, 10 along the bridge axis direction X, formwork is installed at a position that marks the boundary between the first phase construction area and the second phase construction area to prevent the filling material from flowing into the second phase construction area.At this time, installation holes are made in the formwork and the rear plate 96r of the reinforcing plate 96 described above is fitted into the installation hole and installed, or the rear plate 96r of the reinforcing plate 96 described above is installed by sandwiching it between the left and right formwork. In this way, the filler filled in the joints 16 is filled into each recess 90, 90 of adjacent deck slabs 10, 10 along the bridge axis direction X, and after the filler has hardened, the formwork is removed, and the rear plate 96r of the reinforcing plate 96 is fixed and supported by the filler filled in the joints 16 and each recess 90. Then, for example, the second-phase construction and the construction of joining the deck slabs in the direction perpendicular to the bridge axis are carried out together, and filler is filled into the joints 15 between the deck slabs 10, 10 arranged in the direction perpendicular to the bridge axis Y, and the joints 16 between the deck slabs 10, 10 arranged in the bridge axis direction X. At this time, by filling the filler into each recess 90 of each deck slab 10 in the corner assembly part 10C through the filler injection port 91, it becomes possible to reliably fill the filler into each recess 90 of each deck slab 10 in the corner assembly part 10C, and a reinforcement part 9 is constructed in the corner assembly part 10C.

[0040] That is, with the conventional deck joint structure, the corner assembly where the four deck slabs, which are installed adjacent to each other with joints in the bridge axis direction X and the transverse direction Y, are adjacent to each other with joints in between, is not equipped with reinforcement, so the shear force caused by the wheel load W applied to the corner assembly is resisted by the adhesive force between the concrete at the deck corners and the filler filled in the joints. This has led to the risk of punching shear failure due to fatigue at each corner of each deck slab at the corner assembly. On the other hand, according to the deck joint structure of embodiment 1, the four decks 10, 10... are installed adjacent to each other in the bridge axis direction X and the direction perpendicular to the bridge axis Y via joints 16, 15, and the corners of the four decks 10, 10... are adjacent to each other via joints 16, 15. The corner joints 10C are provided with reinforcement sections 9. Therefore, the shear force due to the wheel load W applied to the corner joints 10C is resisted by the adhesive strength of the concrete at the corners of the decks 10 and the shear force of the filler filled in the joints, as well as by the reinforcement sections 9 (reinforcement plates 96 provided in the cross-sectional joints and the filler in the recesses 90). This improves the bending strength and shear load-bearing capacity of each corner of the decks 10, 10... at the corner joints 10C, and provides a deck joint structure with a high suppression effect that can suppress punching shear failure due to fatigue at each corner of the decks 10, 10... at the corner joints 10C.

[0041] In the deck slab joining structure according to embodiment 1, the reinforcing section 9 is exemplified as being configured with recesses 90, 90, 90, 90 formed in each corner of the four deck slabs 10, 10, 10 that make up the corner assembly 10C, a cross-sectional reinforcing plate 96 installed in a cross-sectional joint formed by joints 16, 15 that intersect in the bridge axis direction X and the direction perpendicular to the bridge axis Y at the corner assembly 10C, and a filler material filled in the cross-sectional joints and each recess 90,... of each of the four deck slabs 10,...; however, the reinforcing section may be configured without each recess 90. That is, the reinforcing portion may be any configuration as long as it includes a reinforcing plate having a cross-shaped cross section that is installed in a joint having a cross-shaped cross section at the corner assembly portion 10C.

[0042] Embodiment 2 When half-section construction is performed using the above-described deck slab 10, the installation position of the deck slab 10 may be shifted in the direction Y perpendicular to the bridge axis at curved sections of the road, as shown in Figure 8(a). In this case, for example, as shown in Figure 8(a), the vicinity of each corner edge of two deck slabs 10, 10 arranged adjacent to each other in the direction perpendicular to the bridge axis Y via joints 15 is connected by a deck slab joint device 1, and the vicinity of each corner edge of each of the two deck slabs 10, 10 is connected to one deck slab 10 arranged adjacent to each other in the bridge axis direction X via joints 16 by a deck slab joint device 1A, resulting in a deck slab joining structure. That is, in half-section construction, as shown in Figure 8(b), the corner portions of two deck slabs 10, 10 arranged adjacent to each other in the direction perpendicular to the bridge axis Y via joints 15 are configured to be adjacent to the edge surface 11 of one deck slab 10 in the direction along the bridge axis direction X via joints 16. In other words, the corner portions of two deck slabs 10, 10 and the edge surface 11 of one deck slab 10 are adjacent to each other through a T-shaped cross-section joint formed by intersecting joints 15, 16, and a corner collection portion 10D is formed where the corner portions of two deck slabs 10, 10 are adjacent to each other through joints 15. Therefore, in the deck slab joint structure of embodiment 2, in order to improve the bending strength and shear load-bearing capacity of each corner at the corner assembly 10D, the corner assembly 10D is provided with a reinforcing portion 9.

[0043] As shown in FIG. 8(b), the reinforcement portion 9 of the corner assembly portion 10D in the deck slab joint structure according to the second embodiment is formed by recesses 90A, 90A provided at each of the opposing corners of two decks 10, 10 arranged adjacent to each other via joints 15 in the bridge axis direction Y, extending from one edge surface 11 to the other edge surface 11 near the adjacent corner edges with the corner edge 10E as a boundary, and recesses 90A, 90A provided at each of the opposing corners of the two decks 10, 10 along the bridge axis direction X. The reinforcing plate 96 has a cross-sectional shape and is installed in a T-shaped joint formed by a recess 90B provided in the edge surface 11 of one adjacent deck slab 10 via a joint 16, joints 15 between the opposing corner portions of the two decks 10, 10 and joints 16 between the opposing corner portions of the two decks 10, 10 and the edge surface 11 of one deck slab 10, and a filler material filled in the T-shaped joints and the recesses 90A, 90A, 90B. The reinforcing plate 96 having a cross-shaped cross section may be the same as the reinforcing plate 96 used in the first embodiment, for example.

[0044] The reinforcing plate 96, which has a cross-shaped cross section, is installed so that the surfaces of the three plates of the cross of the reinforcing plate 96, such as the left plate 96p, right plate 96p, and rear plate 96r, face the edge surfaces 11 of each corner of the two deck slabs 10, 10, and so that the remaining plate of the cross of the reinforcing plate 96, such as the front plate 96f, is positioned within a recess 90B provided in the edge surface 11 of one of the deck slabs 10.

[0045] An example of a method for constructing the reinforcing portion 9 of the deck slab joint structure according to the second embodiment will be described. For example, in the one-phase construction described above, the front plate 96f of the reinforcing plate 96 is inserted into the recess 90B provided on the edge surface 11 of one of the deck slabs 10, and the joints 16 and the recesses 90B and 90A are filled with filler, thereby installing the reinforcing plate 96 with a cross-shaped cross section in the T-shaped joint. In other words, the filler filled in the joints 16 and recesses 90B hardens, thereby fixing and supporting the reinforcing plate 96. For example, by carrying out the construction of the second phase of construction and the construction of the deck slab joining work perpendicular to the bridge axis together, and filling the joints 15 between the deck slabs 10, 10 arranged along the direction Y perpendicular to the bridge axis, and the joints 16 between the deck slabs 10, 10 arranged along the bridge axis direction X, and the recesses 90A with filler, a reinforcement section 9 is constructed at the corner assembly section 10D.

[0046] According to the deck joint structure of the second embodiment, the corner of each of the two decks 10, 10 and the edge surface 11 of one deck 10 are adjacent to each other through the T-shaped cross-section joints 15, 16 formed by the intersecting joints. The corner assembly 10D is provided with a reinforcing part 9. Therefore, as with the deck joint structure of the first embodiment, the shear force due to the wheel load W applied to the corner assembly 10D is suppressed by the adhesion force of the concrete at the corner of the deck 10 and the strength of the concrete filled in the joint. Since the structure provides resistance through the shear force of the filler as well as through the reinforcing portion 9 (reinforcing plates 96 provided in the T-shaped cross-section joints and recess 90B, and filler in recesses 90A, 90A, 90B), it is possible to improve the bending strength and shear load-bearing capacity at each corner of each deck slab 10 in the corner assembly portion 10D, and it is now possible to provide a deck slab joint structure with a high suppression effect that can suppress punching shear failure due to fatigue at each corner of each deck slab 10 in the corner assembly portion 10D.

[0047] In the deck slab joint structure according to the second embodiment, the reinforcing portion may also be configured without the recesses 90A.

[0048] Embodiment 3 The reinforcing member 96 may be a reinforcing plate having a plurality of through holes penetrating the plate surface.

[0049] Embodiment 4 The reinforcing member 96 may be a reinforcing plate having an uneven surface.

[0050] If a reinforcing plate having the configuration according to the above-mentioned embodiment 3 or embodiment 4 is used as the reinforcing plate 96, a deck slab joint structure can be provided that can further improve the bending strength against bending due to wheel load W and the shear load-bearing strength against shear force at the above-mentioned corner angle assembly portion 10C and corner angle assembly portion 10D.

[0051] In addition, in each of the above-mentioned embodiments, an example of a deck slab joining structure is shown in which adjacent deck slabs 10 along the direction Y perpendicular to the bridge axis are connected using the deck slab joint device 1 shown in Figure 4, and adjacent deck slabs 10 along the bridge axis direction X are connected using the deck slab joint device 1A shown in Figure 5. However, the deck slab joining structure may also be such that adjacent deck slabs 10 along the direction Y perpendicular to the bridge axis are connected using the deck slab joint device 1A shown in Figure 5, and adjacent deck slabs 10 along the bridge axis direction X are connected using the deck slab joint device 1 shown in Figure 4. Furthermore, the slab joining structure may be one in which only the slab joint device 1 is used as a joint, or one in which only the slab joint device 1A is used as a joint.

[0052] Furthermore, in the deck joining structure according to each embodiment, an example has been shown in which a deck joint device 1, 1A is used that is configured to include one support member such as a C-shaped metal fitting provided on one deck slab 10 that is arranged adjacent to the bridge girder, another support member such as a C-shaped metal fitting provided on the other deck slab 10 that is arranged adjacent to the bridge girder, and a connecting member such as an H-shaped metal fitting that connects the one support member and the other support member, but joints of other configurations, such as joints of the following configurations, may also be used.

[0053] In other words, the joint used in the deck joining structure of the present invention may be a deck joint device that includes a receiving member, such as a C-shaped metal fitting, provided on one deck slab that is installed adjacent to the bridge girder, and a connecting member, such as a T-shaped metal fitting, provided on the other deck slab that is placed adjacent to the bridge girder, and that connects adjacent deck slabs by engaging the connecting member with a recess in the receiving member. In other words, the joint used in the deck slab joining structure of the present invention may be a deck slab joint device that is configured to include a receiving member as a joint component member provided on one deck slab, and a connecting member as a joint component member provided on the other deck slab and connected to the receiving member provided on one deck slab. In this case, the deck slab used in the deck slab joint structure of the present invention is a deck slab configured to include at least one of the above-mentioned receiving member and connecting member.

[0054] In addition, the joint used in the deck slab joining structure of the present invention may be a deck slab joint device configured to include a receiving member as one joint component member having a recessed portion called a bolt box provided on one deck slab installed adjacent to the bridge girder, a receiving member as the other joint component member having a recessed portion called a bolt box provided on the other deck slab installed adjacent to the bridge girder, and a connecting bolt installed across the one bolt box and the other bolt box as a connecting member connecting the one receiving member and the other receiving member. In this case, the deck slab used in the deck slab joint structure of the present invention is a deck slab configured to have a receiving member as a joint component member having a recess such as the above-mentioned bolt box.

[0055] In other words, when the joint used in the deck slab joining structure of the present invention comprises a receiving member provided on one deck slab, a receiving member provided on the other deck slab, and a connecting member connecting these receiving members, and the receiving member is configured to have an engaged portion with which the connecting member engages, and an anchoring portion for anchoring the engaged portion to the concrete of the deck slab, the receiving member becomes the joint constituent member and the engaged portion becomes the joint functional portion. Furthermore, when the joint used in the deck slab joining structure of the present invention is configured to include a receiving member provided on one deck slab and a connecting member provided on the other deck slab, and the receiving member has an engaged portion and a fixing portion for fixing the engaged portion to the concrete of the deck slab, and the connecting member has an engaging portion that engages with the engaged portion and a fixing portion for fixing the engaging portion to the concrete of the deck slab, then either the receiving member becomes the joint component member and the engaged portion becomes the joint functional portion, or the connecting member becomes the joint component member and the engaged portion becomes the joint functional portion.

[0056] In other words, the deck joint structure of the present invention may be a deck joint structure that uses a deck joint device other than the deck joint device 1 or the deck joint device 1A as a joint, such as a connecting member such as the above-mentioned T-shaped metal fitting or a receiving member such as a bolt box.

[0057] Furthermore, the deck joint structure of the present invention may be configured such that adjacent deck slabs 10 along the bridge axis direction X and adjacent deck slabs 10 along the direction perpendicular to the bridge axis Y are connected using joints called loop joints or joints called mechanically anchored lap joints. That is, joints of any configuration may be used to connect adjacent deck slabs 10 along the bridge axis direction X and adjacent deck slabs 10 along the direction perpendicular to the bridge axis Y.

[0058] In this way, the deck joint structure of the present invention may be a deck joint structure in which adjacent deck slabs 10 along the bridge axis direction X and adjacent deck slabs 10 along the bridge axis perpendicular direction Y are connected using joints to form corner assembly portions 10C and corner assembly portions 10D equipped with the above-mentioned reinforcing portions 9. In other words, if the corner assembly portions 10C and 10D are provided with the reinforcing portions 9, the desired effect of the present invention, that is, the shear load-bearing capacity of the corner assembly portions 10C and 10D can be improved, can be obtained.

[0059] Embodiment 5 In each of the above-described embodiments, an example of a deck slab joint structure has been shown in which adjacent deck slabs 10, 10 are connected to each other along the bridge axis direction X using joints, and adjacent deck slabs 10, 10 are connected to each other along the direction perpendicular to the bridge axis Y using joints. For example, as shown in Figure 1, an example of a deck joint structure is shown in which adjacent decks 10, 10 along the bridge axis direction X are connected using a deck joint device 1A, and adjacent decks 10, 10 along the bridge axis perpendicular direction Y are connected using a deck joint device 1. In embodiment 5, as shown in Figures 9(a), (b), and (c), adjacent deck slabs 10, 10 along the bridge axis direction X are connected using joints, and adjacent deck slabs 10, 10 along the direction perpendicular to the bridge axis Y are joined without using joints, using a joining structure in which recesses 90X formed on the edge surface 11 of the deck slab 10, the filler filled in the recesses 90X, and the filler filled in the joints 15. That is, in one deck slab 10 and the other deck slab 10 arranged adjacent to each other via a joint 15 along the direction Y perpendicular to the bridge axis, a recess 90X is provided on the edge surface 11 of the one deck slab 10 and the edge surface 11 of the other deck slab 10 that face each other via the joint 15. In other words, when carrying out half-section construction, joints are used in the first and second phases of construction, which join one deck slab 10 and the other deck slab 10 that are arranged adjacent to each other along the bridge axis direction X via joints 16, but in the bridge axis perpendicular deck slab joining work, which joins one deck slab 10 and the other deck slab 10 that are arranged adjacent to each other along the bridge axis perpendicular direction Y via joints 15, no joints are used, and the joining structure is made up of recesses 90X, recesses 90X formed on the opposing edge surfaces 11, 11 of each adjacent deck slab 10, 10 via joints 15, and the filling material filled in the recesses 90X, recesses 90X and the filling material filled in the joints 15. For example, recesses 90X, 90X are provided on the edge surface 11 of one deck slab 10 and the edge surface 11 of the other deck slab 10 that face each other via a joint 15, so as to face each other. That is, the deck joint structure has multiple pairs of recesses formed by pairs of recesses 90X, recesses 90X facing each other on the edge surface 11 of one deck slab 10 and the edge surface 11 of the other deck slab 10 facing each other via joints 15, spaced at predetermined intervals along the bridge axis direction X. Similar to the filler injection port 91 described above, a filler injection port 91 is provided on the peripheral surface 11 so as to communicate with the recess 90X and the upper surface of the deck slab 10. The edge of the recess 90X and the edge of the filler injection port 91 are formed on the inclined surface 93 described above.

[0060] That is, according to embodiment 5, as shown in Figure 9(a), the four deck slabs 10, 10... are installed adjacent to each other in the bridge axis direction X and the direction perpendicular to the bridge axis Y via joints 16, 15, and each corner portion is provided with a reinforcement portion 9 at the corner collection portion 10C where adjacent corner portions are adjacent to each other via joints having a cross-shaped cross section, and the joining structure between adjacent deck slabs 10, 10 along the direction perpendicular to the bridge axis Y is a joining structure in which one deck slab 10 and the other deck slab 10 arranged adjacent to each other via joints 15 along the direction perpendicular to the bridge axis Y are joined without using joints, using a recess 90X formed on the edge surface 11 of the deck slab 10, the filler filled in the recess 90X, and the filler filled in the joints 15. Furthermore, according to embodiment 5, as shown in Figure 8, a reinforcing portion 9 is provided at adjacent corner assembly portions 10D via a T-shaped cross-section joint, and the joint structure between adjacent deck slabs 10, 10 along the direction Y perpendicular to the bridge axis does not use joints, but rather one deck slab 10 and the other deck slab 10 are arranged adjacent to each other via a joint 15 along the direction Y perpendicular to the bridge axis, and are joined by the above-mentioned recess 90X formed on the edge surface 11 of the deck slab 10, the filler filled in the recess 90X, and the filler filled in the joint 15.

[0061] Even with the deck slab joint structure of embodiment 5, it is possible to provide a deck slab joint structure with a high suppression effect that can suppress punching shear failure due to fatigue at each corner portion of each deck slab 10 at the corner angle collection portion 10C and the corner angle collection portion 10D described above. Furthermore, since no joints are used in the joining structure between adjacent deck slabs 10, 10 along the direction Y perpendicular to the bridge axis, costs can be reduced.

[0062] Embodiment 6 Contrary to embodiment 5, adjacent deck slabs 10, 10 along the direction perpendicular to the bridge axis Y may be connected using joints, and adjacent deck slabs 10, 10 along the bridge axis direction X may be joined without using joints, using recesses 90X formed on the edge surface 11 of the deck slab 10, a filler filled in the recesses 90X, and a filler filled in the joints 16.

[0063] In other words, the joining structure may be such that at least one of adjacent deck slabs 10, 10 in the bridge axis direction X of the bridge via a joint 16 and adjacent deck slabs 10, 10 in the direction perpendicular to the bridge axis Y of the bridge via a joint 15 are connected by a joint.

[0064] Embodiment 7 In addition, adjacent deck slabs 10, 10 along the bridge axis direction X, and adjacent deck slabs 10, 10 along the direction perpendicular to the bridge axis Y, may be joined without using joints using a recess 90X formed on the edge surface 11 of the deck slab 10, a filler filled in the recess 90X, and a filler filled in the joints 15 and 16.

[0065] Embodiment 8 In addition, adjacent deck slabs 10, 10 along the bridge axis direction X, and adjacent deck slabs 10, 10 along the direction perpendicular to the bridge axis Y, may be joined using a filler material filled in joints 15 and 16, without using joints or recesses 90X.

[0066] In short, in the deck joint structure of the present invention, adjacent deck slabs 10 along the bridge axis direction X and adjacent deck slabs 10 along the direction perpendicular to the bridge axis Y are joined without using joints, at least by the adhesive force between the filler filled in joints 16 and 15 and the deck slabs 10, and the deck joint structure may also be configured to have corner assembly portions 10C and 10D equipped with the above-mentioned reinforcing portions 9. In this way, even if adjacent deck slabs 10 along the bridge axis direction X and adjacent deck slabs 10 along the direction perpendicular to the bridge axis Y are joined without using joints, but at least by the adhesive force between the filler filled in joints 16 and 15 and the deck slabs 10, the desired effect of the present invention, that is, improving the shear load-bearing capacity of corner angle collection portions 10C and corner angle collection portions 10D, can be achieved as long as the corner angle collection portions 10C and corner angle collection portions 10D are provided with reinforcing portions 9.

[0067] Furthermore, the deck slab joint structure according to the present invention is applicable even when the installation position of the deck slab 10 is shifted in the bridge axis direction X. In this case, the corners of the two deck slabs 10, 10 arranged adjacent to each other in the bridge axis direction X via joints 16 are adjacent to the edge surface 11 of one deck slab 10 adjacent to the corners of the two deck slabs 10, 10 via joints 15, and a corner assembly portion is formed where the corners of the two deck slabs 10, 10 are adjacent to each other via joints 16, resulting in a deck slab joint structure with a reinforcing portion 9 at the corner assembly portion. In other words, the deck slab joining structure according to the present invention only needs to be provided with reinforcing portions that reinforce each of the opposing corner portions of each deck slab that is installed adjacent to each other with a joint interposed therebetween.

[0068] In the embodiment, an example is shown in which the reinforcing plate 96 is used such that the length extending in all directions from the reference line 96c is smaller for the front plate 96f, the left plate 96p, and the right plate 96p than for the rear plate 96r. However, the reinforcing plate 96 may be made of four flat plates all formed to the same size, or four flat plates formed to different sizes. That is, the reinforcing plate 96 may be any plate that extends in the vertical direction and has a cross-shaped cross section. The reinforcing plate 96 may have no through holes 96a. Furthermore, the shapes of the recesses 90, 90A, 90B provided in the deck slab 10 are not particularly limited. [Explanation of symbols]

[0069] 1,1A Deck joint device 9 Reinforcement 10 Floor slab 10E Corner edge of deck 11 Edge surface of deck slab 15,16 Joint 90, 90A, 90B recess 96 Cross-section reinforcement plate 96a Through hole X Bridge axis direction Y Direction perpendicular to bridge axis

Claims

1. A deck joint structure in which rectangular reinforced concrete decks are installed on girders so that they are adjacent to each other through joints in the bridge axis direction and the direction perpendicular to the bridge axis, and the joints are filled with filler material. The bridge is provided with a reinforcing section that reinforces each of the opposing corners of four deck slabs that are arranged adjacent to each other via cross-shaped joints that intersect the bridge axis direction and the direction perpendicular to the bridge axis, A deck slab joint structure characterized in that the reinforcing portion is provided with a reinforcing plate having a cross-sectional shape installed in a joint having a cross-sectional shape.

2. The deck slab joint structure described in claim 1, characterized in that the reinforcing plate having a cross-shaped cross section is installed so that the cross intersection position of the reinforcing plate coincides with the cross intersection position of the joint having a cross-shaped cross section, and so that the plate surfaces of the four plates of the cross of the reinforcing plate face the edge surfaces of each of the opposing corner portions of the four deck slabs.

3. The deck joint structure described in claim 1, characterized in that the reinforcing portion comprises each recess provided at each corner portion of the four decks so as to extend from one edge surface to the other edge surface near adjacent corner edges, with the corner edges as the boundary, and a filler material filled into each recess.

4. A deck joint structure in which rectangular reinforced concrete decks are installed on girders so that they are adjacent to each other through joints in the bridge axis direction and the direction perpendicular to the bridge axis, and the joints are filled with filler material. The bridge is provided with a reinforcing section that reinforces each of the opposing corners of two decks that are installed adjacent to each other via joints along a direction perpendicular to the bridge axis of the bridge, The reinforcement part is a recess provided on the edge surface of one adjacent deck slab via a joint along the bridge axis direction of the bridge and each of the opposing corners of the two decks; A cross-sectional reinforcing plate installed in a T-shaped cross-sectional joint formed by the joints between the opposing corners of the two decks and the joints between the opposing corners of the two decks and the edge surface of one deck, a filler material filled in the recess, A deck slab joint structure characterized in that a reinforcing plate having a cross-shaped cross section is installed so that the plate surfaces of the plates on three sides of the cross of the reinforcing plate face the edge surfaces of each corner of the two deck slabs, and so that one of the remaining plates of the cross of the reinforcing plate is positioned within a recess provided in the edge surface of one of the deck slabs.

5. The deck slab joint structure described in claim 4, characterized in that the reinforcing portion comprises each recess provided at each opposing corner portion of the two deck slabs, extending from one edge surface to the other edge surface near adjacent corner edges, with the corner edges as the boundary, and filler material filled into each recess.

6. The deck slab joint structure according to any one of claims 1 to 5, characterized in that the reinforcing plate has a through hole penetrating the plate surface.

7. The deck slab joint structure according to any one of claims 1 to 5, characterized in that the reinforcing plate has unevenness on its plate surface.

8. A deck joint structure as described in any one of claims 1 to 5, characterized in that at least one of adjacent deck slabs in the bridge axis direction of the bridge via joints and adjacent deck slabs in the direction perpendicular to the bridge axis of the bridge via joints are connected by a joint.

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