Deck slab, deck slab manufacturing method, and deck slab joint structure

Abstract

To provide a deck slab, etc., configured to reduce slope of a rubbing slope surface that is an upper surface of a rubbing joint that is constructed in a joint between steps that occur between the deck slabs.SOLUTION: A deck slab 10 according to the present invention is a deck slab made of a quadrangular plate-shaped reinforced concrete. The deck slabs are installed adjacent to each other on a bridge girder via a joint 12 and connected by a deck slab joint device 1, comprising a joint widening part 15 that is adjacent to the joint 12 for widening the joint 12, on an upper edge side of an edge surface 11 adjacent to the joint 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to decks and the like that are installed adjacent to each other on bridge girders with joints interposed therebetween. [Background technology]

[0002] Background Art A deck joint structure is known in which adjacent decks on a bridge girder are joined via joints via deck joint devices such as deck connection joints (mechanical joints) (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-159233 A Summary of the Invention [Problem to be solved by the invention]

[0004] In bridges with variable cross slopes, the cross slope differs for each deck slab that is installed adjacent to the girder along the bridge axis direction with joints between them, resulting in a step (height difference) between the top surfaces of adjacent decks at the ends perpendicular to the bridge axis. For example, when joining deck slabs using a deck joint device such as the mechanical joint disclosed in Patent Document 1, the joint width is set narrow, for example at about 10 mm to 20 mm, and in bridges with large changes in cross slope, the step between the top surfaces of adjacent decks through the joints can be 20 mm or more. Therefore, in a deck slab joining structure in which deck slabs are joined using the above-mentioned deck slab joint device, if the joint width is narrow and the step between adjacent deck slabs through the joint is large, the slope of the upper surface (rubbing slope surface) of the rubbing joint formed by rubbing filler (joint material) into the joint may become steep. In addition, manufacturing errors in the deck slabs or construction errors during deck slab installation work may cause the difference in height between adjacent deck slabs through the joints to become large, and in this case, the slope of the top surface of the rubbing joint (rubbing slope surface) may also become steep. For example, as shown in Figure 12(a), when a step b occurs between the upper surface 10t of one deck slab 10Z and the upper surface 10t of the other deck slab 10Z that are arranged adjacent to each other with a joint 12 therebetween, as shown in Figure 12(b), the upper surface of the rubbing joint 18Z formed by filling the joint 12 between the upper surface 10t of one deck slab 10Z and the upper surface 10t of the other deck slab 10Z with filler 17 is formed into a rubbing slope surface SZ that is an inclined surface (gradient surface) that slopes downward from the boundary edge 11t between the upper surface 10t of the deck slab 10Z installed at a higher position and the edge surface 11 to the boundary edge 15t between the upper surface 10t of the deck slab 10Z installed at a lower position and the edge surface 11. Furthermore, the deck 10Z is, for example, a rectangular plate-shaped reinforced concrete deck that is installed adjacent to one another on the girders along the bridge axis direction of the bridge with joints 12 between them and connected by a deck joint device, and is configured to have multiple receiving members (joint constituent members) of a pair of receiving members that constitute the deck joint device on the edge surface 11 side extending perpendicular to the bridge axis of the bridge and adjacent to the joints 12, spaced a predetermined distance apart along the longitudinal direction of the edge surface 11. As the filler 17, for example, concrete, mortar, or the like is used. For example, in FIG. 12(a), when the joint width a of the joint 12 between adjacent floor slabs 10Z, 10Z is 20 mm, and the step (height difference) b between the upper surfaces 10t, 10t of the adjacent floor slabs 10Z, 10Z is 25 mm, as shown in FIG. 12(b), the gradient of the rubbing gradient surface SZ, which is the upper surface of the rubbing joint 18Z formed by rubbing the filler 17 against the joint 12, is given by the gradient θ=tan -1 The angle is (25 / 20)=51°, and the rubbing slope surface SZ becomes a steep rubbing surface. In this way, when the rubbing joint 18Z in which the rubbing slope surface SZ has a steep slope is constructed, the following problems may occur. First, when constructing a steeply inclined rubbing slope surface SZ, the filler that has not yet solidified flows out in the steeply inclined portion during rubbing work at a steep slope, making the rubbing work at a steep slope time-consuming and labor-intensive. In addition, poor adhesion in the waterproofing work in the subsequent process (peeling off of the waterproofing layer from the corners of the rubbing joint 18Z) becomes more likely to occur, and if such poor adhesion occurs, it may lead to corrosion of the rebar and spalling of the concrete due to rainwater seeping into the deck slab. Furthermore, during the maintenance phase, when replacing the asphalt pavement, the asphalt is stripped off using a heavy equipment bucket. However, if the slope of the rubbing slope surface SZ of the rubbing joint 18Z is steep, there is a risk that the heavy equipment bucket will strip off the filler 17 in the steep portion of the rubbing joint 18Z along with the asphalt, which will reduce the durability and strength of the deck. The present invention has been made in consideration of the above-mentioned problems, and provides a deck slab, etc. that is configured so that the gradient of the rubbing slope surface that forms the upper surface of the rubbing joint constructed in the joint between the steps that occur between deck slabs can be made gentle. [Means for solving the problem]

[0005] The deck slab of the present invention is a rectangular plate-shaped reinforced concrete deck slab that is installed adjacent to the bridge girder via joints and connected by a deck slab joint device, and is characterized in that it is provided with a joint widening portion adjacent to the joint and widens the joint on the upper edge side of the edge surface adjacent to the joint. In addition, the deck slab of the present invention is a rectangular plate-shaped reinforced concrete deck slab that is installed adjacent to each other on a bridge girder via joints and connected by a deck joint device, and is characterized in that the edge surface side adjacent to the joint has a plurality of joint components that constitute the deck joint device, spaced a predetermined distance apart along the longitudinal direction of the edge surface, and a joint widening portion that is adjacent to the joint and widens the joint is provided on the upper edge side of the edge surface located between adjacent joint components that are spaced a predetermined distance apart along the longitudinal direction of the edge surface. The deck joint device is further characterized in that it comprises a pair of support members and a connecting member connecting the pair of support members, and the joint component member is one of the pair of support members. The joint widening portion is characterized in that it is a cutout having a rectangular cross section, a cutout having a triangular cross section, or a cutout having an arcuate cross section. In addition, the depth dimension of the joint widening portion, which is the vertical distance from the same horizontal plane as the top surface of the deck to the lower end of the joint widening portion, is less than 1 / 2 the thickness dimension of the deck, and the width dimension of the joint widening portion, which is the horizontal distance from the same vertical plane as the edge surface of the deck to the upper end of the joint widening portion, is less than 100 mm. According to the deck slab of the present invention, a joint widening portion is provided on the upper edge side of the edge surface, so that the width of the joint between the step that occurs between deck slabs arranged adjacent to each other on a girder with a joint interposed therebetween can be widened, and the slope of the rubbing slope surface, which is the upper surface of the rubbing joint constructed in the widened joint, can be made gentler, thereby reducing the step that occurs between the deck slabs, making it possible to facilitate the construction of the rubbing joint, improve the quality of subsequent waterproofing work, suppress deterioration of the deck slabs, and prevent damage to the rubbing joint during the maintenance stage. In addition, the method for manufacturing a deck according to the present invention is the above-mentioned method for manufacturing a deck, characterized in that a formwork having a joint widening portion cut-out portion that becomes the joint widening portion is used as a formwork for forming the deck, and the deck is manufactured by filling concrete into the formwork. In addition, the deck joint structure of the present invention is a deck joint structure in which one deck and the other deck arranged adjacent to each other on a bridge girder with a joint between them are joined by a deck joint device and a filler filled in the joint, wherein the one deck is a deck having the above-mentioned joint widening portion, and the other deck is a deck having a plurality of joint components that constitute the deck joint device on the edge surface side adjacent to the joint, spaced at a predetermined interval along the longitudinal direction of the edge surface, and a step is generated between the upper surface of the one deck and the upper surface of the other deck, which are arranged adjacent to each other with the joint, and the upper surface of the rubbing joint formed by filling the space between the joint widening portion of the one deck and the upper surface of the other deck, which are arranged adjacent to each other with the joint, is formed into a rubbing slope surface, which is an inclined surface. In addition, the deck joint structure of the present invention is a deck joint structure in which decks having the above-mentioned joint widening portions are arranged adjacent to each other via joints on the bridge girder, and the decks are joined together by a deck joint device and a filler filled in the joints, and a step is generated between the upper surface of one deck and the upper surface of the other deck, which are arranged adjacent to each other via the joints, and the upper surface of the rubbing joint formed by filling the space between the joint widening portion of one deck and the joint widening portion of the other deck, which are arranged adjacent to each other via the joints, is formed into a rubbing slope surface, which is an inclined surface. According to the deck slab joint structure of the present invention, by using a deck slab equipped with a joint widening portion, the gradient of the rubbing slope surface can be made gentler and the step that occurs between the deck slabs can be alleviated, which makes it possible to facilitate the construction of the rubbing joint, improve the quality of the subsequent waterproofing work, suppress deterioration of the deck slabs, and prevent damage to the rubbing joint during maintenance. [Brief description of the drawings]

[0006] [Figure 1] A plan view (embodiment 1) showing a state in which deck slabs with joint widening sections are installed adjacent to each other on the girder along the bridge axis direction on a bridge, with joints between the adjacent deck slabs, and the adjacent deck slabs are connected by a deck slab joint device. [Diagram 2]1A and 1B are diagrams showing an example of a deck joint device used to connect decks for bridges, in which (a) is an exploded oblique view of the deck joint device, and (b) is a perspective view of the deck joint device (embodiment 1). [Diagram 3] An enlarged plan view (embodiment 1) showing the state in which deck slabs with joint widening sections are installed adjacent to each other on top of the girders along the bridge axis direction on a bridge. [Figure 4] AA arrow view of FIG. 3 (first embodiment). [Diagram 5] An enlarged oblique view of the main parts (embodiment 1) showing the receiving member and joint widening portion provided on the edge surface side of the deck slab. [Figure 6] 1(a) is a diagram showing the step and widening joint between adjacent deck slabs with joint widening sections, and FIG. 1(b) is a diagram showing a friction joint installed in the widening joint between the steps (embodiment 1). [Figure 7] 1(a) is a diagram showing a step between the upper parts of support members of adjacent decks, and FIG. 1(b) is a diagram showing a rubbing joint installed in the step (embodiment 1). [Figure 8] 1(a) is a diagram showing the step and widening joint between adjacent deck slabs with joint widening sections, and FIG. 1(b) is a diagram showing a friction joint installed in the widening joint between the steps (embodiment 2). [Figure 9] 1(a) is a diagram showing the step and widening joint between adjacent deck slabs with joint widening sections, and FIG. 1(b) is a diagram showing a friction joint installed in the widening joint between the steps (embodiment 3). [Figure 10] 1(a) is a diagram showing the step and widening joint between the deck slabs when a deck slab with a joint widening portion is used as one deck slab and a deck slab without a joint widening portion is used as the other deck slab, and 1(b) is a diagram showing a friction joint installed in the widening joint between the steps (embodiment 4). [Figure 11] 1(a) is a diagram showing the step and widening joint between the deck slabs when a deck slab with a joint widening portion is used as one deck slab and a deck slab without a joint widening portion is used as the other deck slab, and 1(b) is a diagram showing a friction joint installed in the widening joint between the steps (embodiment 4). [Figure 12]1(a) is a diagram showing the step and joint between adjacent deck slabs, and 1(b) is a diagram showing a welded joint installed in the joint between the steps (conventional example). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] EMBODIMENT 1 As shown in FIG. 1, the deck 10 according to the first embodiment is a rectangular plate-shaped reinforced concrete deck that is installed adjacent to the girder (not shown) along the bridge axis direction X of the bridge with joints 12 interposed therebetween and connected by a deck joint device 1. The deck 10 is provided with one of a pair of support members 2, 2... as a joint component member that constitutes the deck joint device 1, and is also provided with a joint widening portion 15. In addition, a deck made of reinforced concrete is, for example, a deck containing reinforcing bars, or prestressing steel wires, or reinforcing bars and prestressing steel wires. In other words, the deck 10 in embodiment 1 is configured to have, on the edge surface 11 side extending along the direction Y perpendicular to the bridge axis of the bridge and adjacent to the joint 12, a plurality of receiving members (joint component members) 2 of a pair of receiving members 2, 2... constituting the deck joint device 1, spaced at a predetermined interval along the longitudinal direction of the edge surface 11 (direction Y perpendicular to the bridge axis). Furthermore, the deck slab 10 in embodiment 1 is configured to be provided with the above-mentioned joint widening portion 15, which is adjacent to the joint 12 and serves as a space for widening the joint 12, on the upper edge side of the edge surface 11 located between adjacent receiving members (joint components) 2 arranged at a predetermined interval along the longitudinal direction of the edge surface 11.

[0008] That is, as shown in Figures 3, 4 and 5, the joint widening portion 15 is composed of a space portion formed so as to be continuous over the entire area of ​​the edge surface 11 in the longitudinal direction (left-right direction in Figures 3 and 4) on the upper edge side of the edge surface 11 located between adjacent receiving members 2 arranged at a predetermined interval along the longitudinal direction of the edge surface 11. The space forming the joint widening portion 15 is configured such that the upper edge corner of the peripheral surface 11 is cut out, for example, with a rectangular cross section to form a space into which the filler 17 is filled. Then, by installing one deck 10 and the other deck 10 so that the joint widening portion 15 of one deck 10 and the joint widening portion 15 of the other deck 10 are adjacent to each other along the bridge axis direction X of the bridge, a widening joint 12X is formed on the joint 12 between adjacent receiving members 2 along the direction perpendicular to the bridge axis Y of the bridge, and is partitioned by the joint widening portion 15 of one deck 10 and the joint widening portion 15 of the other deck 10. Therefore, as shown in Figure 6(a), when a step (height difference) b occurs between the upper surface 10t of one deck slab 10 and the upper surface 10t of the other deck slab 10 that are arranged adjacent to each other via a joint 12, as shown in Figure 6(b), the upper surface of the rubbing joint 18 formed by filling the widening joint 12X between the upper surface 10t of one deck slab 10 and the upper surface 10t of the other deck slab 10 with filler 17 will be formed into a rubbing slope surface S that is an inclined surface (gradient surface) that slopes downward from the boundary edge 15t between the upper surface 10t of the deck slab 10 installed at a higher position and the joint widening portion 15 to the boundary edge 15t between the upper surface 10t of the deck slab 10 installed at a lower position and the joint widening portion 15. In other words, since the joint width of the widening joint 12X is set wider than the joint width a of the joint 12, the gradient of the rubbing slope surface S, which is the upper surface of the rubbing joint 18 formed by filling the widening joint 12X with the filler 17, is gentler than the gradient of the rubbing slope surface SZ, which is the upper surface of the rubbing joint 18Z formed by filling the joint 12 with the filler 17, as shown in Figure 12. In other words, the step between the upper surface 10t of one floor slab 10 and the upper surface 10t of the other floor slab 10, which are arranged adjacent to each other via a joint 12, can be connected by a rubbing slope surface S with a gentle gradient, thereby making it possible to reduce the step between the upper surface 10t of one floor slab 10 and the upper surface 10t of the other floor slab 10. In this way, according to the deck 10 of embodiment 1, the upper edge side of the edge surface 11, which is located between adjacent receiving members 2 and receiving members 2 arranged at a predetermined interval along the longitudinal direction of the edge surface 11, is provided with a joint widening portion 15 that continues along the longitudinal direction of the edge surface 11.Therefore, in a bridge with a changing transverse slope, when a rubbing joint 18 is constructed by filling the widening joint 12X between the step that occurs between the deck slabs 10, 10 arranged adjacent to each other on the girder along the bridge axis direction X with a joint 12, with a filling material 17, the slope of the rubbing slope surface S, which is the upper surface of the rubbing joint 18 formed between the step that occurs between the deck slabs 10, 10, can be made gentle, and the step that occurs between the deck slabs 10, 10 can be alleviated. Therefore, according to the deck 10 of embodiment 1, when a deck joint structure is formed in which deck slabs 10, 10 arranged adjacent to each other on the girder along the bridge axis direction X of the bridge with joints 12 between them are joined by the deck joint device 1 and the filler 17 filled in the joints 12, 12X, it becomes possible to facilitate the construction of the above-mentioned rubbing joint 18, improve the quality of the waterproofing work in the subsequent process, suppress deterioration of the deck, and prevent damage to the rubbing joint 18 during the maintenance stage.

[0009] Hereinafter, a deck slab joining structure using the deck slab 10 and the deck slab joint device 1 according to the first embodiment will be described in detail. As an example, as shown in Figures 1 and 2, the deck joint device 1 is configured to include receiving members 2A(2), 2B(2) provided on the edge surfaces 11, 11 of adjacent decks 10, 10 along the bridge axis direction X of the bridge, and a connecting member 3 connecting the receiving members 2A(2), 2B(2) provided on the edge surfaces 11, 11 of adjacent decks 10, 10. As shown in Figure 1, one receiving member 2A(2) installed on the edge surface 11 of one adjacent deck slab 10 along the bridge axis direction X of the bridge and the other receiving member 2B(2) installed on the edge surface 11 of the other adjacent deck slab 10 are connected by a connecting member 3, thereby connecting one deck slab 10 and the other deck slab 10 arranged adjacent to each other. Incidentally, FIG. 1 is a plan view seen from above of deck slabs 10, 10 arranged adjacent to each other on a girder along the bridge axis direction X of the bridge, with joints 12 between them, connected by a deck slab joint device 1, and this plan view is a plan view in a state in which the joints 12 have not yet been filled with filling material 17.

[0010] As shown in FIG. 2, the receiving member 2 includes an engagement receiving portion 5 having an engagement recess 4 with which an engagement portion 7 provided on the connecting member 3 engages, and an anchoring portion 6 to be anchored to the concrete of the deck slab 10. The receiving member 2 of the deck slab joint device 1 is constituted by an integrally molded product made of steel or the like in which the engagement receiving portion 5 and the fixing portion 6 are integrally molded by pouring cast iron into a formwork, for example.

[0011] As shown in Figure 2, the connecting member 3 has one engaging portion 7 that engages with the engaging portion 5 of one of the receiving members 2, the other engaging portion 7 that engages with the engaging portion 5 of the other receiving member 2, and a connecting portion 8 that connects the one engaging portion 7 and the other engaging portion 7. That is, the connecting member 3 is composed of a pair of engaging portions 7,7 that engage with each engaging recess 4,4 of each engaging receiving portion 5,5 of the receiving members 2,2 respectively installed on each edge surface 11 of each adjacent deck slab 10, and a connecting portion 8 that connects the pair of engaging portions 7,7. The connecting member 3 is formed, for example, from a steel integrally molded product in which the pair of engaging portions 7, 7 and the connecting portion 8 are integrally molded by pouring cast iron into a mold.

[0012] The engaging receiving portion 5 of the receiving member 2 includes, for example, a bottom plate 51, a gable wall 52, a side wall 53 and an engaging wall 54, and includes an engaging recess 4 surrounded by the bottom plate 51, the gable wall 52, the side wall 53 and the engaging wall 54. That is, the engagement receiving portion 5 comprises a bottom plate 51, a gable wall 52 rising from the bottom plate 51, left and right side walls 53, 53 extending from both the left and right sides of the gable wall 52 and rising from the bottom plate 51, and an engagement wall 54 extending from the extended ends 53e, 53e of the left and right side walls 53, 53 and rising from the bottom plate 51.

[0013] The engagement recess 4 has an engagement portion insertion opening 41 which is an upper opening facing the bottom plate 51 and serves as an insertion port for inserting the engagement portion 7 into the engagement recess 4, and an opening facing the gable wall 52 and serves as an insertion groove for inserting the connecting portion 8. The opening 41 for inserting the engagement portion is an opening surrounded by the upper end of the end wall 52, the upper ends of the left and right side walls 53, 53, and the upper end of the engagement wall 54, and is formed by an opening through which the engagement portion 7 of the connecting member 3 can be inserted into the engagement recess 4 from above. The opening 42 for inserting the connecting part is a groove formed in the center between the left and right sides of the engagement wall 54 and extending continuously from the opening 41 for inserting the engagement part toward the bottom plate 51, and is formed with a groove width that allows the connecting part 8 of the connecting member 3 to be inserted from above.

[0014] The fixing portion 6 of the receiving member 2 embedded on the edge surface 11 side of the deck 10 is configured, for example, to include fixing members 60A, 60A such as two fixing reinforcements protruding from the left and right end sides of the outer surface of the gable wall 52 of the engaging receiving portion 5 and arranged at a distance in a direction (horizontal (left and right) direction) H along the plate surface of the deck 10, and an end connecting member 60B connecting the ends of these fixing members 60A, 60A.

[0015] The engagement portion 7 of the connecting member 3 is, for example, configured to have an outer peripheral wall facing the inner peripheral wall of the engagement recess 4, and is configured to have a fixing portion 72 having an outer wall surface 71 facing the inner wall surface of the gable wall 52 and the inner wall surfaces of the left and right side walls 53, 53, and a wall portion 74 having an inner wall surface 73 facing the inner wall surface 54u of the engagement wall 54.

[0016] The fixing portion 72 of the engagement portion 7 is formed with a bolt insertion hole 75 for fixing the fixing portion 72 to the bottom plate 51 of the engagement receiving portion 5 with a fixing means such as a bolt (not shown). In this case, the bolt insertion hole 75 is configured, for example, with a recess for accommodating and fastening the bolt head formed on the upper side of the fixing portion 72, and a bolt shaft fastening hole (internal thread hole) formed in the bottom surface of the recess. Incidentally, the fixing portion 72 and the bolt as the fixing means may not be used. For example, the engaging portion of the connecting member and the engaging receiving portion of the receiving member may be fixed by using a wedge-shaped insertion member (not shown) as a fixing means between the inner wall surface of the engaging wall of the engaging receiving portion and the inner wall surface of the wall portion of the engaging portion.In short, any configuration is acceptable as long as it is possible to fix the engaging portion of the connecting member and the engaging receiving portion of the receiving member.

[0017] The receiving member 2 is embedded in the edge surface 11 of the deck 10 with the engaging receiving portion 5 embedded in the edge surface 11 of the deck 10, for example, with the opening 41 for inserting the engaging portion and the opening 42 for inserting the connecting portion of the engaging recess 4 exposed to the outside, and the fixing portion 6 extended from the gable wall 52 toward the center of the deck 10 is embedded in the deck 10. That is, the receiving member 2 is placed in a formwork for forming the deck 10 (not shown) so that the opening 41 for inserting the engagement part and the opening 42 for inserting the connecting part of the engagement recess 4 of the receiving member 2 are exposed to the outside and the other parts are embedded in the concrete of the deck 10, and then concrete is poured into the formwork and allowed to harden, thereby forming the deck 10 with the receiving member 2 installed on the edge surface 11 side. In other words, as shown in Figures 3 to 5, the receiving member 2 is embedded in the concrete of the deck slab 10 so that the opening 41 for inserting the engaging portion and the upper surface 2t surrounding the opening 41 for inserting the engaging portion are exposed, and the opening 42 for inserting the connecting portion and the outer wall surface 54f of the engaging wall 54 are exposed, and above this exposed upper surface 2t, an upper opening space 16 is formed which functions as a space for inserting the connecting member 3 and a space for filling the filling material 17.

[0018] The deck slab 10 having the joint widening portion 15 may be manufactured, for example, as follows. A formwork having a joint widening portion cut-out section which will become the joint widening portion 15 is prepared as a formwork for forming the deck, and after placing the receiving member 2, reinforcing bars, etc. within the formwork, concrete is filled into the formwork, thereby manufacturing a deck 10 having a joint widening portion 15 on the upper edge side of the edge surface 11 located between the receiving members 2. As for the formwork for forming the deck, a formwork in which the joint widening portion cut-out section which will become the joint widening portion 15 has been formed in advance may be used as described above, but it is also possible to use a formwork constructed by attaching a square timber or the like which will become the cut-out section for the joint widening portion 15 to the part which will become the joint widening portion 15 on the inner surface of an existing formwork for forming the deck.

[0019] Then, from above each engagement recess 4,4 of the receiving members 2,2 embedded on the edge surfaces 11,11 of each adjacent deck slab 10,10 along the bridge axis direction X of the bridge, each engagement portion 7,7 of the connecting member 3 is inserted into each engagement recess 4,4 through the engagement portion insertion opening 41 at the top of each engagement recess 4,4, and the connecting portion 8 of the connecting member 3 is inserted into the connecting portion insertion opening 42 of each engagement recess 4,4. For example, by having each engagement wall surface 73,73 of the pair of engagement portions 7,7 guided by the inner wall surfaces 54u,54u of the left and right engagement walls 54,54, the pair of engagement portions 7,7 are inserted into the engagement recesses 4,4 (see FIG. 2). Furthermore, by fixing the engaging portion 7 inserted into the engaging recess 4 with a fixing means, the engaging portion 7 of the connecting member 3 and the engaging receiving portion 5 of the receiving member 2 are fixed together. As a result of the above, the adjacent deck slabs 10, 10 are connected to each other by the deck slab joint device 1.

[0020] After adjacent deck slabs 10, 10 are connected with a deck joint device 1, filler 17 is filled into the joints 12 between the edge surfaces 11, 11 of each adjacent deck slab 10, 10, and filler 17 is filled into the widening joint 12X formed between the joint widening portions 15 at the upper end sides between adjacent deck slabs 10, 10, and further, filler 17 is filled into the upper opening space 16.

[0021] Then, as shown in Figure 6, a rubbing joint 18 is constructed in which the upper surface of the filler 17 filled in the widening joint 12X is formed on the rubbing slope surface S, and as shown in Figure 7, a rubbing joint 18A is constructed in which the upper surface of the filler 17 filled in adjacent upper opening spaces 16, 16 along the bridge axis direction X of the bridge is formed on the rubbing slope surface SA. Furthermore, since the width of the upper opening space portions 16, 16 along the bridge axis direction X (the width in the left-right direction in Figure 7) is even larger than the joint width of the widening joint 12X, the rubbing slope surface SA of the rubbing joint 18A is formed into a slope surface with an even gentler gradient than the rubbing slope surface S of the rubbing joint 18. As a result, it becomes possible to facilitate the construction of the rubbing joint 18A formed between the steps of the upper opening space 16, 16, improve the quality of the waterproofing work in the subsequent process, suppress deterioration of the deck slab, and prevent damage to the rubbing joint 18A during the maintenance stage.

[0022] As a result of the above, a deck slab joint structure is formed in which adjacent decks 10, 10 along the bridge axis direction X of the bridge are joined by the deck slab joint device 1 and the filler material 17.

[0023] That is, the deck joint structure according to the first embodiment is a deck joint structure in which the decks 10 according to the first embodiment are arranged adjacent to each other on the girder along the bridge axis direction X of the bridge, with the decks 10, 10 being joined together by the deck joint device 1 and the filler 17 filled in the joints, and a step is generated between the upper surface 10t of one deck 10 arranged adjacent to each other through the joint 12 and the upper surface 10t of the other deck 10, and the upper surface of the rubbing joint 18 formed by filling the filler 17 into the widening joint 12X composed of the joint widening portion 15 of one deck 10 and the joint widening portion 15 of the other deck 10 arranged adjacent to each other through the joint 12 is formed as an inclined surface inclined along the bridge axis direction X of the bridge, i.e., a rubbing slope surface S.

[0024] In other words, in the deck slab joint structure of embodiment 1, a deck 1 equipped with the joint widening portion 15 of embodiment 1 described above is used, so that a widening joint 12X is formed between the joint widening portions 15, 15 of adjacent deck slabs 10, 10, and a rubbing slope surface S with a small gradient can be formed as the upper surface of the rubbing joint 18 formed by filling this widening joint 12X. In this way, the rubbing slope surface S formed by filling the widening joint 12X can be formed as a rubbing slope surface S with a small gradient angle, making it possible to reduce the step that occurs between the deck slabs 10, 10. Therefore, according to the deck slab joint structure of embodiment 1, it is possible to facilitate the construction of the rubbing joint 18, improve the quality of the subsequent waterproofing work, suppress deterioration of the deck slab, and prevent damage to the rubbing joint 18 during the maintenance stage.

[0025] According to the deck joint structure of the first embodiment, for example, in the deck slabs 10, 10 arranged adjacent to each other on the girder via the joint 12 along the bridge axis direction X of the bridge, if the joint width (joint width) of the widening joint 12X widened by the joint widening parts 15, 15 is 59 mm and the step b between the adjacent deck slabs 10, 10 is 10 mm, the gradient (%) of the rubbing gradient surface S, which is the upper surface of the rubbing joint 18 formed by filling the widening joint 12X with the filler 17, is 10×100 / 59=approximately 16.95. That is, a gradient of 17% (gradient angle θ=tan -1 (17 / 100) × 180 / π = approx. 9.65°), which allows the formation of a gentle rubbing slope surface S.

[0026] EMBODIMENT 2 The joint widening portion may be a joint widening portion 15A formed by a cutout having a triangular cross section as shown in FIG. In other words, the joint widening portion 15A is configured such that the upper edge corner of the edge surface 11 located between adjacent receiving members 2 arranged at a predetermined interval along the longitudinal direction of the edge surface 11 extending along the direction Y perpendicular to the bridge axis of the bridge on the deck slab 1 is cut out into a triangular cross-section to form a space into which filling material 17 is filled.

[0027] EMBODIMENT 3 As shown in FIG. 9, the joint widening portion may be a joint widening portion 15B formed by a cutout having an arc-shaped cross section. In other words, the joint widening portion 15B is configured such that the upper edge corner of the edge surface 11 located between adjacent receiving members 2 arranged at a predetermined interval along the longitudinal direction of the edge surface 11 extending along the direction Y perpendicular to the bridge axis of the bridge on the deck 1 is notched into a cross-sectional arc shape (1 / 4 arc) to form a space into which the filling material 17 is filled.

[0028] According to the deck 10 of embodiment 2, the deck joint structure using said deck 10, and the deck 10 of embodiment 3, and the deck joint structure using said deck 10, just like the deck 10 of embodiment 1 and the deck joint structure using said deck 10, a widening joint 12X is formed between the joint widening portions 15A, 15A or between the joint widening portions 15B, 15B of adjacent decks 10, 10, and a rubbing slope surface S with a small gradient can be formed as the upper surface of the rubbing joint 18 formed by filling this widening joint 12X, thereby obtaining the same effect as in embodiment 1.

[0029] EMBODIMENT 4 In each of the above-described embodiments, a deck joint structure has been exemplified in which one deck 10 and the other deck 10 are arranged adjacent to each other on the girder along the bridge axis direction X of the bridge with joints 12 between them, and both decks 10 have joint widening portions. However, a deck joint structure may also be used in which one of the decks arranged adjacent to each other on the girder along the bridge axis direction X of the bridge with joints 12 between them is a deck 10 having the above-described joint widening portion, and the other deck is a conventional deck 10Z without a joint widening portion, for example, as shown in FIG. 12. Even in the deck joint structure according to the fourth embodiment, as shown in Fig. 10 and Fig. 11, it is possible to form an expanded joint 12Y in which the width of the joint 12 in the bridge axis direction X is expanded by the joint expansion part of one deck slab 10, so that when a step occurs between the adjacent deck slabs 10, 10Z, it is possible to make the gradient of the rubbing gradient surface S, which is the upper surface of the rubbing joint part 18Y formed by filling the expansion joint 12Y with the filler 17, gentler. That is, compared to the deck joint structure shown in Fig. 12, it is possible to form a rubbing gradient surface S with a smaller gradient, so that the same effect as each of the above-mentioned embodiments can be obtained. In addition, Figure 10 illustrates an example in which a deck slab 10 having a joint widening portion is installed on the lower side, and Figure 11 illustrates an example in which a deck slab 10 having a joint widening portion is installed on the higher side.

[0030] That is, embodiment 4 is a deck joint structure in which one deck 10 and the other deck 10Z are arranged adjacent to each other on a girder along the bridge axis direction X of the bridge with a joint 12 interposed therebetween and joined by a deck joint device 1 and a filler 17 filled in the joints 12, 12Y, and a deck 10 equipped with the above-mentioned joint widening portion is used as one deck, and a deck 10Z equipped with the above-mentioned joint widening portion is used as the other deck, which extends along the direction perpendicular to the bridge axis Y of the bridge and has a plurality of support members 2 of a pair of support members 2, 2 constituting the deck joint device 1 spaced at a predetermined interval along the longitudinal direction of the edge surface 11 adjacent to the joint 12. In other words, a deck 10Z configured without the above-mentioned joint widening portion is used. A step is generated between the upper surface 10t of one deck slab 10 and the upper surface 10t of the other deck slab 10Z, which are arranged adjacent to each other via the joint 12, and a rubbing joint 18Y is constructed by filling the widening joint 12Y formed between the joint widening portion of one deck slab 10 and the upper surface 10t of the other deck slab 10Z, which are arranged adjacent to each other via the joint 12, with filler 17, and the upper surface of the rubbing joint 18Y is formed into a rubbing slope surface S, which is an inclined surface (gradient surface) that slopes along the bridge axis direction X of the bridge, resulting in a deck slab joint structure.

[0031] In addition, Figures 6 to 12 show a state in which the up-down positions (levels) of the undersides of the left and right deck slabs are not aligned between the left and right deck slabs, but in the deck slab joint structure of the present invention, the up-down positions (levels) of the undersides of the left and right deck slabs may not be aligned between the left and right deck slabs, or they may be aligned between the left and right deck slabs.

[0032] The sizes of the above-mentioned joint widening portions 15, 15A, 15B are preferably set as follows. For example, the depth dimension of the joint widening portion, which is the vertical distance from the same horizontal plane as the upper surface 10t of the deck slab 10 to the lower end of the joint widening portion, is set to 1 / 2 or less of the thickness dimension of the deck slab, and further, the width dimension of the joint widening portion, which is the horizontal distance from the same vertical plane as the edge surface 11 of the deck slab 10 to the upper end of the joint widening portion, is set to The distance was set to 100 mm or less. In other words, if the depth dimension of the joint widening portion is 1 / 2 the thickness dimension (plate thickness dimension) of the deck slab 10, the shear resistance of the filler 17 filled in the joint widening portion can be made approximately the same as the shear resistance of the deck portion located below the joint widening portion. However, if the depth dimension of the joint widening portion exceeds half the thickness dimension of the deck slab, the shear resistance of the deck portion located below the joint widening portion may become smaller than the shear resistance of the filling material filled in the joint widening portion, so it is preferable that the depth dimension of the joint widening portion be limited to a maximum of 100 mm. For the above reasons, the depth dimension of the joint widening portion is set to less than half the thickness dimension of the deck slab. The optimum range of the depth of the joint widening portion is 20 mm to 40 mm. In other words, it is preferable to set the depth of the joint widening portion to 20 mm to 40 mm, since the filler 17 mixed with aggregate can be used and the integrity of the filler 17 and the deck 10 can be easily ensured. In addition, it is desirable that the minimum value of the depth dimension of the joint widening portion be the dimension necessary for adhesion of the filler material 17, and it is desirable that the maximum value of the depth dimension of the joint widening portion be a dimension less than the cover thickness of the reinforcing bar. If the width dimension of the joint widening portion is 100 mm, it becomes easy to set the gradient of the rubbing slope surface between the deck slabs to the desired gradient, for example, to 20% or less, as described below, so it is sufficient if the upper limit of the width dimension of the joint widening portion is 100 mm. For the above reasons, the width dimension of the joint widening portion is set to 100 mm or less. The optimum range for the width of the joint widening portion is 50 mm or less. In other words, it is preferable to set the width of the joint widening portion to 50 mm or less, since this makes it easier to ensure the rebar cover. Furthermore, the minimum width dimension of the joint widening portion is not particularly limited as long as it can increase the joint width.

[0033] The deck of the present invention is effective, for example, when the distance between adjacent decks (joint width of joint 12) is 10 mm to 40 mm and the step between the upper surfaces of adjacent decks is 5 mm or more and less than 10 mm, because its use can make the gradient of the rubbing slope surface between the decks gentler and reduce the step that occurs between the decks.

[0034] In addition, in the present invention, in order to facilitate the construction of the rubbing joints, improve the quality of subsequent waterproofing work, suppress deterioration of the deck slabs, and prevent damage to the rubbing joints during maintenance and management, it is preferable to set the gradient of the rubbing slope surface between the deck slabs to 20% or less. In addition, the 20% gradient can be converted into a gradient angle θ as follows: θ=tan -1 (20 / 100)×180 / π=approximately 11.3°.

[0035] For example, a half-section construction (lane-specific deck replacement construction) is known in which the bridge is divided into two phases: a first phase in which the bridge's perpendicular direction Y is divided into two equal parts, and the decks for the driving lanes are lined up and connected along the bridge axis direction (vehicle travel direction) X, and a second phase in which the decks for the passing lanes are lined up and connected along the bridge axis direction (vehicle travel direction) X. In other words, in this half-section construction, in which the deck is replaced for each lane, it is necessary to arrange the receiving members of the deck joint device on the edge surface side of the deck along the direction perpendicular to the bridge axis Y, at a predetermined interval along the longitudinal direction of the edge surface, and also to arrange the receiving members of the deck joint device on the edge surface side of the deck along the bridge axis direction X, at a predetermined interval along the longitudinal direction of the edge surface. Therefore, by fabricating a deck that is equipped with a joint widening portion on the upper edge of the edge surface along the bridge axis direction X and using this deck for half-section construction, it is possible to make gentler the gradient of the rubbing slope surface that forms the upper surface of the rubbing joint constructed in the step between decks installed adjacent to each other along the direction perpendicular to the bridge axis Y, and to obtain the same effect as the above-mentioned embodiment in the step between decks installed adjacent to each other along the direction perpendicular to the bridge axis Y.

[0036] In addition, in the embodiment, an example has been shown of a deck slab joint device having one support member such as a C-shaped fitting provided on one deck slab arranged adjacent to each other on the bridge girder, the other support member such as a C-shaped fitting provided on the other deck slab arranged adjacent to each other on the bridge girder, and a connecting member such as an H-shaped fitting that connects the one support member and the other support member, but deck slab joint devices of other configurations, for example, deck slab joint devices of the following configurations, may also be used. In other words, a deck joint device may be used that includes a receiving member, such as a C-shaped fitting, provided on one deck slab that is installed adjacent to the bridge girder, and an engaging member, such as a T-shaped fitting, provided on the other deck slab that is arranged adjacent to the bridge girder, and that connects adjacent deck slabs by engaging the engaging member into a recess in the receiving member. In this case, the deck of the present invention is configured to have a plurality of receiving members such as C-shaped fittings as joint components constituting the deck joint device, or fitting members such as T-shaped fittings as joint components constituting the deck joint device, arranged at a predetermined interval along the longitudinal direction of the edge surface, on the edge surface side adjacent to the joint, and a joint widening portion adjacent to the joint and widening the joint, on the upper edge side of the edge surface located between adjacent joint components arranged at a predetermined interval along the longitudinal direction of the edge surface. Alternatively, a deck joint device may be used which includes one receiving member having a recess such as a bolt box provided on one deck slab which is installed adjacent to the bridge girder, another receiving member having a recess such as a bolt box provided on the other deck slab which is arranged adjacent to the bridge girder, and a connecting bolt which is installed across the one bolt box and the other bolt box and serves as a connecting member connecting the one receiving member and the other receiving member. In this case, the deck of the present invention, like the deck described in the embodiment, is configured to have a plurality of receiving members as joint components that constitute the deck joint device on the edge surface side adjacent to the joint, spaced a predetermined distance apart along the longitudinal direction of the edge surface, and a joint widening portion adjacent to the joint and widening the joint on the upper edge side of the edge surface located between adjacent joint components arranged a predetermined distance apart along the longitudinal direction of the edge surface.

[0037] In addition, the deck slab of the present invention can also be applied to rectangular plate-shaped reinforced concrete deck slabs that are installed adjacent to each other on the bridge girders via joints and connected by deck slab joint devices called loop joints. In this case, the deck is configured with a joint widening portion adjacent to the joint on the upper edge side of the edge surface adjacent to the joint, which widens the joint.

[0038] In other words, the deck of the present invention is a rectangular plate made of reinforced concrete that is installed adjacent to the bridge girder with joints between them and connected by a deck joint device, and is configured to have a joint widening portion adjacent to the joint and widening the joint on the upper edge side of the edge surface adjacent to the joint. [Explanation of symbols]

[0039] 1 Deck joint device, 2 receiving member (joint component member), 10, 10Z deck, 11 edge surface of deck, 12 joint, 12X, 12Y widening joint, 15, 15A, 15B joint widening portion, 17 filling material, 18, 18Y rubbing joint portion, S Gradient surface for rubbing.

Claims

1. A rectangular plate-shaped reinforced concrete deck that is installed adjacent to the bridge girder through joints and connected by a deck joint device, A deck slab characterized in that a joint widening portion is provided adjacent to the joint on the upper edge side of the edge surface adjacent to the joint, which widens the joint.

2. A rectangular plate-shaped reinforced concrete deck that is installed adjacent to the bridge girder through joints and connected by a deck joint device, On the edge surface side adjacent to the joint, a plurality of joint components constituting the deck joint device are provided at predetermined intervals along the longitudinal direction of the edge surface, and, A deck slab characterized in that it is provided with a joint widening portion adjacent to the joint and widening the joint on the upper edge side of the edge surface located between adjacent joint components arranged at a predetermined interval along the longitudinal direction of the edge surface.

3. The deck joint device includes a pair of support members and a connecting member connecting the pair of support members, The deck according to claim 2, characterized in that the joint component member is one of the pair of receiving members.

4. 4. The deck according to claim 1, wherein the joint widening portion is a cutout having a rectangular cross section, a cutout having a triangular cross section, or a cutout having an arcuate cross section.

5. A deck described in any one of claims 1 to 3, characterized in that the depth dimension of the joint widening portion, which is the vertical distance from above the same horizontal plane as the top surface of the deck to the lower end of the joint widening portion, is less than 1 / 2 the thickness dimension of the deck, and the width dimension of the joint widening portion, which is the horizontal distance from above the same vertical plane as the edge surface of the deck to the upper end of the joint widening portion, is less than 100 mm.

6. A method for manufacturing a deck according to any one of claims 1 to 3, A method for manufacturing a deck, characterized in that a formwork having a joint widening cut-out portion that becomes a joint widening portion is used as a formwork for forming the deck, and the deck is manufactured by filling the formwork with concrete.

7. A deck joint structure in which one deck and the other deck arranged adjacent to each other via joints on a bridge girder are joined by a deck joint device and a filler filled in the joints, One of the decks is a deck having a joint widening portion according to any one of claims 1 to 3, The other deck is a deck having a plurality of joint components constituting a deck joint device on the edge surface side adjacent to the joint, the joint components being spaced apart at predetermined intervals along the longitudinal direction of the edge surface, There is a step between the top surface of one deck and the top surface of the other deck, which are arranged adjacent to each other with a joint in between. A deck joint structure characterized in that the upper surface of a rubbing joint formed by filling the space between the joint widening portion of one deck slab and the upper surface of the other deck slab, which are arranged adjacent to each other through a joint, with filler material, is formed into a rubbing slope surface, which is an inclined surface.

8. A deck joint structure in which the decks according to any one of claims 1 to 3 are arranged adjacent to each other via joints on a bridge girder and the decks are joined together by a deck joint device and a filler filled in the joints, There is a step between the top surface of one deck and the top surface of the other deck, which are arranged adjacent to each other with a joint in between. A deck joint structure characterized in that the upper surface of a rubbing joint formed by filling a filler between a joint widening portion of one deck slab and a joint widening portion of the other deck slab, which are arranged adjacent to each other through a joint, is formed into a rubbing slope surface, which is an inclined surface.

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