JP7705359B2 - floor slab - Google Patents

Description

This disclosure relates to deck slabs.

JP 2020-186614 A describes a joint structure for precast deck slabs and a method for constructing the joint. In the joint structure for precast deck slabs, multiple precast deck slabs are installed on top of the bridge girder. Each precast deck slab has a connection end that faces the other precast deck slabs.

A joint reinforcing bar is provided at the connection end, and a cutout recess with a specified height is formed at the top end of the connection end. A connection top end member is installed in a pair of cutout recesses of a pair of precast deck slabs. In addition, each connection end has an uneven surface, and a filler hardening material is filled between the uneven surfaces of the pair of connection ends. This uneven surface is uneven when viewed from the side.

JP 2020-186614 A

In the precast deck described above, shear force can be transmitted in the height direction between each of the pair of precast decks and the filler material. However, since shear force cannot always be transmitted in directions other than the height direction, there is room for improvement in terms of shear force transmission. Therefore, there is a demand for the shear force to be transmitted more effectively.

The purpose of this disclosure is to provide a deck that can transmit shear forces more effectively.

The deck according to the present disclosure is a deck extending in the bridge axis direction, in the bridge axis perpendicular direction perpendicular to the bridge axis direction, and in the height direction perpendicular to both the bridge axis direction and the bridge axis perpendicular direction. The deck has an end face facing the other deck, and on the end face, a number of convex portions protruding toward the other deck are arranged. At least one surface of each convex portion is an inclined surface inclined with respect to the bridge axis direction, the bridge axis perpendicular direction, and the height direction. The inclined surface of one convex portion is inclined so as to approach or move away from the other convex portion as it moves from one side to the other in the height direction, and the convex portion has a top surface and a number of inclined surfaces inclined with respect to the bridge axis direction, the bridge axis perpendicular direction, and the height direction, and the top surface has a portion in which the horizontal length of the top surface becomes longer as it moves from one side to the other side in the height direction of the end surface .

This deck has an end face facing the other deck, and a convex portion is formed on this end face that protrudes toward the other deck. Therefore, the shear force acting between each deck and the filler after filling the gap between this deck and the other deck can be transmitted, thereby increasing the shear strength. Furthermore, the convex portion formed on the end face facing the other deck has an inclined surface that is inclined in the bridge axis direction, the direction perpendicular to the bridge axis, and the height direction. This inclined surface is inclined so as to approach or move away from the other convex portion as it moves from one side of the height direction to the other. Therefore, shear force can be transmitted between the deck and the filler via this inclined surface in three directions, the bridge axis direction, the direction perpendicular to the bridge axis, and the height direction, so that shear force can be transmitted more effectively.

In the above-mentioned deck, the convex portion has a plurality of inclined surfaces forming the side surface of the convex portion , and the plurality of inclined surfaces include a first inclined surface located on one side in the height direction and a second inclined surface located on the other side in the height direction, and the first inclined surface and the second inclined surface may be aligned in the height direction. The first inclined surface may face one of the diagonally downward and diagonally upward directions, and the second inclined surface may face the other of the diagonally downward and diagonally upward directions. In this case, in both cases where the deck is subjected to a downward shear force relative to the filler, and where the filler is subjected to a downward shear force relative to the deck, the shear force can be transmitted in three directions via either the first inclined surface or the second inclined surface. Therefore, the transmission of the shear force between the deck and the filler can be made more effective.

The deck described above may have reinforcing bars protruding from the convex parts. In this case, it is easier to remove the formwork used in manufacturing the deck compared to a deck with reinforcing bars protruding from parts other than the convex parts. This makes it easier to manufacture the deck.

This disclosure allows for more effective transmission of shear forces.

1 is a side cross-sectional view showing a joint structure according to a first embodiment. FIG. 2 is a plan view showing the joint structure of FIG. 1 . FIG. 2 is a perspective view showing a continuous fiber reinforcement material. FIG. 6 is a side cross-sectional view showing a joint structure according to a second embodiment. FIG. 5 is a plan view showing the joint structure of FIG. 4 . FIG. 11 is a perspective view showing a floor slab according to a third embodiment. FIG. 7 is a plan view showing the deck of FIG. 6 . FIG. 7 is a side view showing the end surface of the deck of FIG. 6 . FIG. 11 is a perspective view showing a floor slab according to a fourth embodiment. FIG. 10 is a plan view showing the deck of FIG. 9 .

Below, an embodiment of the deck and deck joint structure according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and duplicated descriptions will be omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated to facilitate understanding, and the dimensional ratios, etc. are not limited to those shown in the drawings.

First Embodiment
Fig. 1 is a cross-sectional view showing a joint structure 1 according to a first embodiment. Fig. 2 is a plan view showing the joint structure 1. As shown in Fig. 1 and Fig. 2, the joint structure 1 includes a first floor slab 10, a second floor slab 20 provided at a position spaced apart from the first floor slab 10, and a filler 30 filled between the first floor slab 10 and the second floor slab 20.

The first deck 10, the second deck 20, and the filler material 30 constitute, for example, a bridge. As an example, the bridge is an expressway bridge. The bridge, for example, comprises multiple girders extending in the bridge axis direction D1 and multiple support members extending between the multiple girders in the bridge axis perpendicular direction D2, and the first deck 10 and the second deck 20 are arranged on the multiple girders so that they extend in the bridge axis direction D1 and the bridge axis perpendicular direction D2. The bridge axis perpendicular direction D2 is perpendicular to the bridge axis direction D1.

Each of the first and second floor slabs 10 and 20 is, for example, a precast concrete floor slab manufactured in advance in a factory. Each of the first and second floor slabs 10 and 20 is, for example, a UFC floor slab that does not have reinforcing bars and is made of ultra high strength fiber reinforced concrete (UFC). The first and second floor slabs 10 and 20 may also be made of UHPFRC (Ultra High Performance Fiber Reinforced Cementitious Composite).

The first deck 10 has an upper surface 11 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 12 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the opposite side to the upper surface 11 of the first deck 10, and a first end surface 13 extending in the direction perpendicular to the bridge axis D2 and in a height direction D3. The height direction D3 coincides with the thickness direction of the first deck 10 and the second deck 20.

Each of the upper surface 11 and the lower surface 12 is, for example, flat. The first end surface 13 has a first convex portion 14 that protrudes toward the second floor slab 20 and a first concave portion 15 that is recessed in a direction away from the second floor slab 20. The first end surface 13 has, for example, a plurality of first convex portions 14. The first convex portions 14 protrude in a side view (when viewed along the horizontal direction), and the first concave portions 15 are recessed in a side view. The first convex portions 14 and the first concave portions 15 are aligned along the height direction D3.

The first convex portion 14 is, for example, trapezoidal in shape having a top surface 14b and a pair of inclined surfaces 14c located on both sides in the height direction D3 as viewed from the top surface 14b. The first concave portion 15 is, for example, trapezoidal in shape having a bottom surface 15b and a pair of inclined surfaces 15c located on both sides in the height direction D3 as viewed from the bottom surface 15b. Each inclined surface 15c is provided on an extension (on the same plane) of the inclined surface 14c.

The configuration of the second deck 20 is, for example, similar to that of the first deck 10. The second deck 20 has an upper surface 21, a lower surface 22, and a second end surface 23 that faces the first end surface 13 in the bridge axis direction D1. The second end surface 23 has a second convex portion 24 that protrudes toward the first deck 10, and a second concave portion 25 that is recessed in a direction away from the first deck 10.

For example, the second convex portion 24 protrudes in a side view, and the second concave portion 25 is recessed in a side view. The second convex portion 24 has, for example, a top surface 24b and a pair of inclined surfaces 24c located on both sides in the height direction D3 when viewed from the top surface 24b, and the second concave portion 25 has a bottom surface 25b and a pair of inclined surfaces 25c located on both sides in the height direction D3 when viewed from the bottom surface 25b.

For example, in the joint structure 1, the first deck 10 and the second deck 20 are installed so that the top surface 14b of the first convex portion 14 and the top surface 24b of the second convex portion 24 face each other in the bridge axis direction D1, and the bottom surface 15b of the first recess 15 and the bottom surface 25b of the second recess 25 face each other in the bridge axis direction D1. However, in the joint structure, the first deck 10 and the second deck 20 may be installed so that the top surface 14b of the first convex portion 14 and the bottom surface 25b of the second recess 25 face each other in the bridge axis direction D1, and the bottom surface 15b of the first recess 15 and the top surface 24b of the second convex portion 24 face each other in the bridge axis direction D1.

Also, in the above, an example has been described in which the first convex portion 14 is trapezoidal with a top surface 14b and a pair of inclined surfaces 14c, and the first concave portion 15 is trapezoidal with a bottom surface 15b and a pair of inclined surfaces 15c. However, the first convex portion 14 and the first concave portion 15 may be of a shape other than a trapezoid. For example, the first convex portion may be rectangular with a top surface, an upper surface, and a lower surface, and the first concave portion may be rectangular with a bottom surface, an upper surface, and a lower surface. The same applies to the second convex portion 24 and the second concave portion 25.

For example, the filler 30 is a cement-based material that has fluidity when filled and hardens after a certain time has passed since filling. The filler 30 may be non-shrink mortar, cast-in-place UFC, or UHPFRC, and various materials can be used as the filler 30.

The first deck 10 has a first continuous fiber reinforcement 16 protruding from the first end surface 13 toward the second deck 20. The first continuous fiber reinforcement 16 extends, for example, along the bridge axis direction D1. A part of the first continuous fiber reinforcement 16 is embedded in the first deck 10, and the depth of the part of the first continuous fiber reinforcement 16 embedded in the first deck 10 (the length in the bridge axis direction D1) is equal to or greater than the length at which the concrete of the first deck 10 can be fixed. For example, the first deck 10 has a plurality of first continuous fiber reinforcements 16, which are aligned along the height direction D3. The plurality of first continuous fiber reinforcements 16 are also aligned along the bridge axis perpendicular direction D2.

For example, the first continuous fiber reinforcement 16 protrudes from the first convex portion 14 (as an example, the top surface 14b of the first convex portion 14). However, the first continuous fiber reinforcement 16 may protrude from the inclined surface 14c (or the inclined surface 15c) or from the first recess 15 (as an example, the bottom surface 15b of the first recess 15). In this way, the location from which the first continuous fiber reinforcement 16 protrudes is not particularly limited.

The second deck 20, like the first deck 10, has a second continuous fiber reinforcement 26 that protrudes from the second end face 23 toward the first deck 10. A portion of the second continuous fiber reinforcement 26 is embedded in the second deck 20, and the depth of the portion of the second continuous fiber reinforcement 26 embedded in the second deck 20 is equal to or greater than the length at which the concrete of the second deck 20 can be fixed. The second deck 20 has a plurality of second continuous fiber reinforcements 26, which are aligned along the direction perpendicular to the bridge axis D2 and the height direction D3.

For example, the second continuous fiber reinforcement 26 protrudes from the second convex portion 24 (as an example, the top surface 24b of the second convex portion 24). However, the location from which the second continuous fiber reinforcement 26 protrudes is not particularly limited, as with the first continuous fiber reinforcement 16. For example, the position in the height direction D3 of the second continuous fiber reinforcement 26 is the same as the position in the height direction D3 of the first continuous fiber reinforcement 16.

For example, in a plan view (when viewed along the height direction D3), the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 are alternately arranged along the bridge axis perpendicular direction D2. However, the positions of the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 are not limited to the above example and can be changed as appropriate. In addition, the configuration of the first continuous fiber reinforcement 16 is, for example, the same as the configuration of the second continuous fiber reinforcement 26. Therefore, in the following, when there is no need to distinguish between the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26, the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 will be collectively described as the continuous fiber reinforcement 6.

Figure 3 is a perspective view showing a continuous fiber reinforcement material 6. As shown in Figure 3, the continuous fiber reinforcement material 6 is, for example, a continuous fiber reinforcement strand. That is, the continuous fiber reinforcement material 6 is in a state in which a plurality of strands 7 formed by bundling continuous fibers are twisted together and hardened with resin. The continuous fiber reinforcement material 6 has higher rust resistance than reinforcing bars and is made of a material that is more corrosion resistant than iron.

The continuous fiber reinforcement 6 is, for example, a carbon fiber rod. As an example, the continuous fiber reinforcement 6 includes a plurality of strands 7, which are twisted together in a spiral shape. The strands 7 are made of resin. The strands 7 are made of, for example, a matrix resin. The matrix resin is, for example, an epoxy resin, a vinyl ester resin, or the like. The strands 7 may be reinforced with, for example, carbon fiber, aramid fiber, basalt fiber, or glass fiber.

Next, the effects of the joint structure 1 according to this embodiment will be described. As shown in FIG. 1 and FIG. 2, in the joint structure 1, the first floor slab 10 has a first end face 13 facing the second floor slab 20, the second floor slab 20 has a second end face 23 facing the first floor slab 10, and the filler 30 is filled between the first end face 13 and the second end face 23. The first floor slab 10 has a first continuous fiber reinforcement 16 protruding from the first end face 13, and the second floor slab 20 has a second continuous fiber reinforcement 26 protruding from the second end face 23. Therefore, since the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26, which are not reinforcing bars and are less likely to rust, protrude from the first end face 13 and the second end face 23, respectively, the possibility of corrosion can be reduced. Therefore, the corrosion of the members constituting the first floor slab 10 and the second floor slab 20 can be more reliably suppressed to increase the reliability of corrosion prevention.

Furthermore, the first end face 13 is formed with a first convex portion 14 that protrudes toward the second floor slab 20 and a first concave portion 15 that is concave in a direction away from the second floor slab 20. The second end face 23 is formed with a second convex portion 24 that protrudes toward the first floor slab 10 and a second concave portion 25 that is concave in a direction away from the first floor slab 10. For example, each of the first convex portion 14 and the second convex portion 24 protrudes in a side view, and each of the first concave portion 15 and the second concave portion 25 is concave in a side view. Therefore, the shear force in the height direction D3 acting between each of the first floor slab 10 and the second floor slab 20 and the filler 30 can be transmitted more effectively, thereby increasing the shear strength.

In this embodiment, the first floor slab 10 and the second floor slab 20 do not have rebars and are made of ultra-high strength fiber reinforced concrete. Therefore, because the first floor slab 10 and the second floor slab 20 do not have rebars, corrosion of the members that make up the first floor slab 10 and the second floor slab 20 can be more reliably avoided. Furthermore, because the first floor slab 10 and the second floor slab 20 do not have rebars and are made of ultra-high strength fiber reinforced concrete, the first floor slab 10 and the second floor slab 20 can be made thin while maintaining high strength.

In this embodiment, the filler 30 is made of ultra-high strength fiber-reinforced concrete. This allows the distance between the first end face 13 and the second end face 23 to be shortened while maintaining high strength, and eliminates the need for reinforcing bars between the first end face 13 and the second end face 23.

Second Embodiment
Next, a joint structure 41 according to the second embodiment will be described with reference to Figures 4 and 5. A portion of the configuration of the joint structure 41 is the same as a portion of the configuration of the joint structure 1 described above. Therefore, in the following description, the same reference numerals will be used to denote portions that overlap with the description of the joint structure 1, and the description will be omitted as appropriate. The joint structure 41 includes a support member 42 extending in the bridge axis direction D1, a first deck 50 and a second deck 60 arranged on the support member 42 so as to be aligned in the direction perpendicular to the bridge axis D2, and a filler 30 filled between the first deck 50 and the second deck 60.

The support member 42 is, for example, a steel girder having an upper flange 42b, a web 42c, and a lower flange 42d. However, the support member 42 is not limited to a steel girder, and may be, for example, a PC girder. The joint structure 41 is provided at site A, and as an example, site A is a construction site on a highway. For example, at site A, renewal work is being carried out on the deck including the first deck 50 and the second deck 60.

For example, the first deck 50 and the second deck 60 have a short side extending in the bridge axis direction D1 and a long side extending in the direction perpendicular to the bridge axis D2, and are rectangular plates having a thickness in the height direction D3. The first deck 50 and the second deck 60 are UFC decks made of ultra-high strength fiber reinforced concrete, for example, like the first deck 10 and the second deck 20 described above. The material of the first deck 50 and the second deck 60 is, for example, the same as the material of the first deck 10 and the second deck 20.

The first deck 50 has an upper surface 51 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 52 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the opposite side to the upper surface 51 of the first deck 50, and a first end surface 53 extending in the bridge axis direction D1 and in the height direction D3. The first end surface 53 has a first convex portion 54 protruding toward the second deck 20 and a first concave portion 55 recessed in a direction away from the second deck 60.

The first convex portion 54 protrudes in a plan view, and the first concave portion 55 is recessed in a plan view. The first convex portion 54 and the first concave portion 55 are aligned along the bridge axis direction D1. The shapes of the first convex portion 54 and the first concave portion 55 are, for example, the same as the shapes of the first convex portion 14 and the first concave portion 15 described above. Therefore, a detailed description of the shapes of the first convex portion 54 and the first concave portion 55 will be omitted.

The configuration of the second deck 60 is, for example, similar to that of the first deck 50. The second deck 60 has an upper surface 61, a lower surface 62, and a second end surface 63 that faces the first end surface 53 in the direction perpendicular to the bridge axis D2. The second end surface 63 has a second convex portion 64 that protrudes toward the first deck 50, and a second concave portion 65 that is recessed in a direction away from the first deck 50.

The second convex portion 64 protrudes in a plan view, and the second concave portion 65 is recessed in a plan view. The shape and arrangement of the second convex portion 64 and the second concave portion 65 are, for example, similar to the shape and arrangement of the second convex portion 24 and the second concave portion 25 described above. Therefore, a detailed description of the shape and arrangement of the second convex portion 64 and the second concave portion 65 will be omitted.

The first floor slab 50, like the first floor slab 10 described above, has a first continuous fiber reinforcement 16 that protrudes from the first end face 53 toward the second floor slab 60. The second floor slab 60, like the second floor slab 20 described above, has a second continuous fiber reinforcement 26 that protrudes from the second end face 63 toward the first floor slab 50.

In the first deck 50, the multiple first continuous fiber reinforcements 16 are aligned along both the bridge axis direction D1 and the height direction D3. Similarly, in the second deck 60, the multiple second continuous fiber reinforcements 26 are aligned along both the bridge axis direction D1 and the height direction D3. In the joint structure 41, the first continuous fiber reinforcements 16 and the second continuous fiber reinforcements 26 are aligned alternately in a plan view.

The joint structure 41 includes a slip-stop member 43 that fits between the first deck 50 and the second deck 60. The slip-stop member 43 is, for example, a stud dowel (headed stud). The slip-stop member 43 has, for example, a fixed portion 43b fixed to the upper flange 42b of the support member 42, and a rod-shaped portion 43c that extends in a rod shape from the fixed portion 43b along the height direction D3.

For example, the joint structure 41 has multiple anti-slip members 43, which are aligned along the bridge axis direction D1. For example, the multiple anti-slip members 43 are aligned along the bridge axis perpendicular direction D2. In the joint structure 41, the anti-slip members 43 and the gap filler 30 are integrated, and the first deck 50 and the second deck 60 are integrated with the gap filler 30.

As described above, the joint structure 41 according to the second embodiment includes a support member 42 that supports the first and second decks 50 and 60, and the first and second decks 50 and 60 face each other along the direction perpendicular to the bridge axis D2 at the top of the support member 42. Each of the first convex portion 54 and the second convex portion 64 protrudes in a plan view, and each of the first and second concave portions 55 and 65 is recessed in a plan view.

As described above, when the first and second decks 50 and 60 face each other on the support member 42 along the bridge axis perpendicular direction D2, and the joint between the first and second decks 50 and 60 is located on the support member 42, the joint may be subjected to a negative bending force acting as an upper edge tension. In contrast, in the second embodiment, the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 are fixed to the first and second decks 50 and 60 and the interfilling material 30, so that the above-mentioned negative bending can be resisted. Furthermore, the first convex portion 54 and the second convex portion 64 protrude in a plan view, and the first and second concave portions 55 and 65 are recessed in a plan view. That is, in the joint structure 41, the first end surface 53 and the second end surface 63 are uneven in a plan view, so that horizontal shear force can be more effectively transmitted to each of the first and second decks 50 and 60 and the interfilling material 30.

The joint structure 41 includes a support member 42 that supports the first floor slab 50 and the second floor slab 60, and a slip-stop member 43 that protrudes upward from the support member 42 and fits between the first floor slab 50 and the second floor slab 60. Therefore, the slip-stop member 43 transmits horizontal shear forces between the support member 42 and the interfacial material 30, and the unevenness of the first floor slab 50 and the second floor slab 60 transmits horizontal shear forces between the interfacial material 30 and each of the first floor slab 50 and the second floor slab 60. Therefore, the slippage of the interfacial material 30 and the first floor slab 50 and the second floor slab 60 relative to the support member 42 can be more reliably suppressed.

Third Embodiment
Next, the floor slab 70 according to the third embodiment will be described with reference to Figs. 6, 7 and 8. The floor slab 70 can be used, for example, in place of the first floor slab 50 or the second floor slab 60 described above. Furthermore, the floor slab 70 can be used in place of the first floor slab 10 or the second floor slab 20 described above. Fig. 6 is a perspective view of an end surface 73 of the floor slab 70 as viewed from below. Fig. 7 is a plan view showing the end surface 73 of the floor slab 70. Fig. 8 is a front view of the end surface 73.

The deck 70 has, for example, reinforcing bars 76. However, the deck 70 does not have to have reinforcing bars 76, for example, when the deck 70 is a UFC deck. The deck 70 has an upper surface 71 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 72 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the side opposite the upper surface 71 of the deck 70, and an end surface 73 extending in the direction perpendicular to the bridge axis D2 and in the height direction D3.

The end face 73 is the face facing the other deck. Filling material (e.g., filler material 30) is filled between the end face 73 and the other deck. The end face 73 has a convex portion 74 that protrudes toward the other deck and a concave portion 75 that is recessed in a direction away from the other deck. The end face 73 has multiple convex portions 74 and multiple concave portions 75.

For example, the convex portion 74 protrudes in a plan view, and the concave portion 75 is recessed in a plan view. As an example, the convex portion 74 and the concave portion 75 are aligned along the direction perpendicular to the bridge axis D2. However, in the third embodiment, the convex portion 74 and the concave portion 75 may be aligned along the bridge axis direction D1 or the height direction D3, and the direction in which the convex portion 74 and the concave portion 75 are aligned is not particularly limited.

The convex portion 74 has, for example, a top surface 77 and multiple inclined surfaces 78 that are inclined in the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. The concave portion 75 has, for example, a bottom surface 79 and multiple inclined surfaces 80 that are inclined in the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. Each inclined surface 80 is provided on an extension (on the same plane) of each inclined surface 78. The inclined surface 78 of one convex portion 74 is inclined so as to approach or move away from the other convex portion 74 as it moves from one side to the other in the height direction D3. In other words, the inclined surface 78 is inclined in the direction in which the convex portion 74 widens or narrows as it moves from one side to the other in the height direction D3.

Reinforcing bars 76 protrude from the convex portion 74. The deck 70 has, for example, a plurality of reinforcing bars 76 arranged along the height direction D3. As an example, the reinforcing bars 76 protrude from the top surface 77 of the convex portion 74, and the reinforcing bars 76 are arranged in pairs above and below on the top surface 77. However, the deck 70 does not need to have reinforcing bars 76, and may have, for example, the continuous fiber reinforcement material 6 described above instead of the reinforcing bars 76.

For example, the top surface 77 is a flat surface. As one example, the top surface 77 has a hand drum shape. In this case, the horizontal length of the top surface 77 (for example, the direction perpendicular to the bridge axis D2) increases from the center of the height direction D3 of the end surface 73 toward each of the two ends of the height direction D3. For example, the bottom surface 79 is a flat surface. As one example, the bottom surface 79 has a hexagonal shape. In this case, the horizontal length of the bottom surface 79 decreases from the center of the height direction D3 of the end surface 73 toward each of the two ends of the height direction D3.

For example, the inclined surface 78 is flat. As an example, the inclined surface 78 has a rectangular shape. The multiple inclined surfaces 78 have a first inclined surface 78b located on one side (e.g., the upper side) of the height direction D3 and a second inclined surface 78c located on the other side (e.g., the lower side) of the height direction D3. The orientation of the first inclined surface 78b is different from the orientation of the second inclined surface 78c. The first inclined surface 78b of one convex portion 74 is inclined so as to move away from the other convex portions 74 (in the direction in which the convex portions 74 narrow) as it moves downward from the upper end. In addition, the second inclined surface 78c of one convex portion 74 is inclined so as to move closer to the other convex portions 74 (in the direction in which the convex portions 74 widen) as it moves downward from the upper end.

The first inclined surface 78b faces either diagonally downward or diagonally upward, and the second inclined surface 78c faces the other diagonally downward or diagonally upward. As a specific example, the first inclined surface 78b faces diagonally downward, and the second inclined surface 78c faces diagonally upward. In other words, the normal to the first inclined surface 78b extends diagonally downward from the first inclined surface 78b, and the normal to the second inclined surface 78c extends diagonally upward from the second inclined surface 78c.

As described above, the deck 70 according to the third embodiment has an end surface 73 facing the other deck, and a convex portion 74 protruding toward the other deck is formed on the end surface 73. Therefore, the shear force acting between each deck and the filler after the filler is filled between the deck 70 and the other deck can be transmitted more effectively, so that the shear strength can be increased. Furthermore, the convex portion 74 formed on the end surface 73 facing the other deck has an inclined surface 78 inclined with respect to the bridge axis direction D1, the bridge axis perpendicular direction D2, and the height direction D3. The inclined surface 78 is inclined so as to approach or move away from the other convex portion 74 as it moves from one side to the other in the height direction D3. Therefore, the shear force can be transmitted between the deck 70 and the filler through the inclined surface 78 in three directions, the bridge axis direction D1, the bridge axis perpendicular direction D2, and the height direction D3, so that the shear force can be transmitted more effectively. Furthermore, in the third embodiment, the filler 30 can be filled more reliably than in the first embodiment. For example, in the first embodiment, there is a concern that air pockets may form under the protrusions, but in the third embodiment, the occurrence of such air pockets can be more reliably prevented.

In the floor slab 70 according to the third embodiment, the convex portion 74 has a plurality of inclined surfaces 78, and the plurality of inclined surfaces 78 include a first inclined surface 78b located on one side of the height direction D3 and a second inclined surface 78c located on the other side of the height direction D3, and the first inclined surface 78b and the second inclined surface 78c are aligned in the height direction D3. The first inclined surface 78b faces one of the diagonally downward and diagonally upward directions (diagonally downward in the above example), and the second inclined surface 78c faces the other of the diagonally downward and diagonally upward directions (diagonally upward in the above example). Therefore, in both cases where the floor slab 70 receives a downward shear force against the filler, and where the filler receives a downward shear force against the floor slab 70, the shear force can be transmitted in three directions via either the first inclined surface 78b or the second inclined surface 78c. Therefore, the transmission of the shear force between the floor slab 70 and the filler can be made more effective.

The deck 70 according to the third embodiment may include reinforcing bars 76 protruding from the protrusions 74. This makes it easier to remove the formwork used in manufacturing the deck 70 compared to a deck that includes reinforcing bars protruding from parts other than the protrusions 74 (e.g., the recesses 75). This makes it easier to manufacture the deck 70.

Fourth Embodiment
Next, a floor slab 90 according to a fourth embodiment will be described with reference to Figures 9 and 10. The floor slab 90, like the floor slab 70, can be used in place of the first floor slab 50 or the second floor slab 60 described above. A portion of the configuration of the floor slab 90 is the same as a portion of the configuration of the floor slab 70. Therefore, descriptions that overlap with the floor slab 70 will be omitted as appropriate.

Figure 9 is an oblique view of the end surface 93 of the deck slab 90 as seen from below. Figure 10 is a plan view showing the end surface 93 of the deck slab 90. As shown in Figures 9 and 10, the deck slab 90 has an upper surface 91 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 92 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the opposite side to the upper surface 91 of the deck slab 90, and an end surface 93 extending in the direction perpendicular to the bridge axis D2 and in the height direction D3.

The end surface 93 has a convex portion 94 that protrudes toward the other deck slab described above, and a concave portion 95 that is recessed in a direction away from the other deck slab. The convex portion 94 has, for example, a top surface 97 and multiple inclined surfaces 98 that are inclined with respect to the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. The concave portion 95 has, for example, a bottom surface 99 and multiple inclined surfaces 100 that are inclined with respect to the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. The inclined surface 98 of one convex portion 94 is inclined so as to approach the other convex portion 94 (in the direction in which the convex portion 94 widens) as it moves from the upper end to the lower end.

For example, the top surface 97 has a trapezoidal shape. In this case, the horizontal length of the top surface 97 (for example, the direction perpendicular to the bridge axis D2) increases from one side (for example, the upper side) to the other side (for example, the lower side) in the height direction D3 of the end surface 93. For example, the bottom surface 99 has a trapezoidal shape. In this case, the horizontal length of the bottom surface 99 decreases from one side to the other side in the height direction D3 of the end surface 93. For example, the inclined surface 98 has a rectangular shape. As an example, the inclined surface 98 has a parallelogram shape. The inclined surface 98 faces either diagonally downward or diagonally upward, and as an example, it faces diagonally upward. That is, the normal to the inclined surface 98 extends diagonally upward from the inclined surface 98.

As described above, the deck 90 according to the fourth embodiment has an end surface 93 facing the other deck, and a convex portion 94 protruding toward the other deck is formed on the end surface 93. The convex portion 94 formed on the end surface 93 facing the other deck has an inclined surface 98 inclined with respect to the bridge axis direction D1, the bridge axis perpendicular direction D2, and the height direction D3. Therefore, the shear force can be transmitted between the deck 90 and the interfill material in three directions, the bridge axis direction D1, the bridge axis perpendicular direction D2, and the height direction D3, via the inclined surface 98, so that the shear force can be transmitted more effectively. Therefore, the deck 90 can achieve the same effect as the deck 70. In the fourth embodiment, the deck 90 is described as having a convex portion 94 having an inclined surface 98 facing diagonally upward. However, the deck may have a convex portion having both an inclined surface 98 facing diagonally upward and an inclined surface facing diagonally downward. In this way, the type and arrangement of the inclined surface of the convex portion of the deck can be changed as appropriate.

Various embodiments of the deck and deck joint structure according to the present disclosure have been described above. However, the deck and deck joint structure according to the present disclosure are not limited to the above-mentioned embodiments, and can be modified as appropriate within the scope of the gist described in the claims. In other words, the shape, size, material, number, and arrangement of each part in the deck and deck joint structure can be modified as appropriate within the scope of the above gist.

For example, in the first embodiment described above, a joint structure 1 including a first deck 10 and a second deck 20 facing each other along the bridge axis direction D1 as shown in FIG. 1 has been described. However, the first deck 10 and the second deck 20 may face each other along the bridge axis perpendicular direction D2, and the direction in which the first deck and the second deck face each other is not particularly limited.

For example, in the second embodiment described above, a joint structure 41 was described that includes a shear stopper member 43 that is a stud dowel. However, the type of shear stopper member is not limited to a stud dowel. For example, the shear stopper member may be a perforated steel plate dowel. In other words, various shear stopper members can be used as long as they are members that can be integrated with the filler material between the first and second decks.

For example, in the third embodiment described above, a floor slab 70 is described that includes a convex portion 74 having a top surface 77 that is hand-drum shaped, and a concave portion 75 having a bottom surface 79 that is hexagonal shaped. However, instead of the convex portion 74 and the concave portion 75, a floor slab may include a convex portion having a top surface that is hexagonal shaped, and a concave portion having a bottom surface that is hand-drum shaped. In other words, the convex and concave portions in the floor slab 70 may be reversed. Furthermore, the shapes of the convex and concave portions of the floor slab 70 are not limited to those in the above-described embodiment and can be changed as appropriate. The same applies to the floor slab 90 according to the fourth embodiment.

1, 41...joint structure, 6...continuous fiber reinforcement, 7...strand, 10...first floor slab, 11...upper surface, 12...lower surface, 13...first end surface, 14...first convex portion, 14b...top surface, 14c...inclined surface, 15...first recess, 15b...bottom surface, 15c...inclined surface, 16...first continuous fiber reinforcement, 20...second floor slab, 21...upper surface, 22...lower surface, 23...second end surface, 24...second convex portion, 24b...top surface, 24c...inclined surface, 25...second recess, 25b...bottom surface, 25c...inclined surface, 26...second continuous fiber reinforcement, 30...filling material, 42...support member, 42b...upper flange, 42c...web, 42d...lower flange, 43...anti-slip member, 43b...fixing portion, 43c...rod-shaped portion, 5 0...first floor slab, 51...upper surface, 52...lower surface, 53...first end surface, 54...first convex portion, 55...first concave portion, 60...second floor slab, 61...upper surface, 62...lower surface, 63...second end surface, 64...second convex portion, 65...second concave portion, 70...floor slab, 71...upper surface, 72...lower surface, 73...end surface, 74...convex portion, 75...concave portion, 76...reinforcing bar, 77...top surface , 78...inclined surface, 78b...first inclined surface, 78c...second inclined surface, 79...bottom surface, 80...inclined surface, 90...deck slab, 91...top surface, 92...bottom surface, 93...end surface, 94...convex portion, 95...concave portion, 97...top surface, 98...inclined surface, 99...bottom surface, 100...inclined surface, A...site, D1...bridge axis direction, D2...perpendicular to the bridge axis, D3...height direction.

Claims (3)

A deck extending in a bridge axis direction, a bridge axis perpendicular direction perpendicular to the bridge axis direction, and a height direction perpendicular to both the bridge axis direction and the bridge axis perpendicular direction,
It has an end surface facing the other deck,
A plurality of protrusions protruding toward the other floor slab are arranged on the end surface,
At least one surface of each of the protrusions is an inclined surface inclined with respect to the bridge axis direction, the direction perpendicular to the bridge axis, and the height direction,
The inclined surface of one of the protrusions is inclined so as to approach or move away from the other protrusion as it moves from one side to the other side in the height direction ,
The convex portion has a top surface and a plurality of inclined surfaces inclined with respect to the bridge axis direction, the bridge axis perpendicular direction, and the height direction,
the top surface has a portion in which the horizontal length of the top surface increases from one side to the other side in the height direction of the end surface,
Floor slab. The protrusion has a plurality of inclined surfaces forming side surfaces of the protrusion ,
The plurality of inclined surfaces include a first inclined surface located on one side in the height direction and a second inclined surface located on the other side in the height direction,
The first inclined surface and the second inclined surface are aligned in the height direction,
The first inclined surface faces one of an obliquely downward direction and an obliquely upward direction,
The second inclined surface faces the other of the obliquely downward and the obliquely upward.
The deck according to claim 1. A reinforcing bar protruding from the protruding portion is provided.
A deck according to claim 1 or 2.

Images