JP6976214B2 - Joining structure and joining method - Google Patents

Description

The present invention relates to a joining structure and a joining method in which decks are joined to each other.

Conventionally, various joining structures and joining methods for joining deck slabs have been known. Patent Document 1 describes a joining structure in which a plurality of precast decks are joined to each other. In this joint structure, a plurality of precast decks are arranged so as to face each other, and a concrete curable material is filled in a padding portion between the plurality of precast decks to construct a joint structure. The stuffing portion is provided with a joint reinforcing bar protruding in the bridge axis direction from each of the plurality of precast decks and a reinforcing reinforcing bar extending in the direction perpendicular to the bridge axis. An end band is crimped to the tip of the joint reinforcing bar.

Of the two precast decks, one precast deck has an end face facing the other precast deck and the other precast deck has an end face facing one precast deck. These end faces form an interface between the curable material and the deck body, and the shape of each end face when viewed from the height direction of the precast deck is flat. That is, the interface between the curable material and the main body of the deck is flat.

Japanese Unexamined Patent Publication No. 2012-62664

In the above-mentioned joint structure, a curable material is filled as a filler in the padding portion formed between the two decks. However, in this joint structure, the seam between the deck and the filler, that is, the interface between the deck and the filler is flat, and this interface can be a weak point in durability. Specifically, of the tensile force and shearing force generated in the two decks, the weakness is that the resistance to the tensile force is smaller than the resistance to the shearing force, and the tensile force causes the floor slab and the filler to be separated from each other. The problem of cracking can occur. If cracks occur from this interface, fatigue due to vibration and heat accumulates, and water may infiltrate through the cracks, causing a problem that the internal reinforcing bars or girders are corroded.

It is an object of the present invention to provide a joining structure and a joining method capable of increasing the strength of the interface between the deck and the filler.

The joint structure according to the present invention includes a girder member extending in the bridge axis direction, a girder member mounted on the girder member, a bridge axis orthogonal direction orthogonal to the bridge axis direction, a bridge axis perpendicular direction, and a bridge axis direction and a bridge axis perpendicular direction. A first slab extending in the height direction orthogonal to both sides, and a second slab placed on a girder and facing the first slab and extending in the bridge axis direction, the bridge axis perpendicular direction, and the height direction. The first floor slab has a first end face facing the second floor slab along the bridge axis direction, comprising a filler to be filled between the first floor slab and the second floor slab. The two-bed slab has a second end face facing the first slab along the bridge axis direction, and the first end face extends along the direction perpendicular to the bridge axis when viewed from the height direction and the bridge. The first unevenness having an inclined portion extending diagonally in the direction perpendicular to the axis and the direction of the bridge axis is formed, and the second end face extends along the direction perpendicular to the bridge axis when viewed from the height direction and is also formed. A second unevenness having an inclined portion extending diagonally in the direction perpendicular to the bridge axis and in the direction of the bridge axis is formed, and the first slab and the second slab are joined along the direction in which the girder extends, and the first slab is joined . The first floor slab has a first reinforcing bar protruding from the first end face, the second floor slab has a second reinforcing bar protruding from the second end face, and the first reinforcing bar protrudes from the convex portion of the first unevenness. , The second reinforcing bar protrudes from the convex portion of the second unevenness.

In the joint structure described above, the first deck has a first end face extending in the direction perpendicular to the bridge axis and the height direction, and the second deck has a second end face extending in the direction perpendicular to the bridge axis and the height direction. This joint structure is constructed by filling a filler between the first end face and the second end face. When viewed from the height direction, the first end face of the first deck has a first unevenness extending in the direction perpendicular to the bridge axis, and the second end face of the second deck extends in the direction perpendicular to the bridge axis. The second unevenness is formed. The first end face forms an interface between the first deck and the filler, and the second end face forms an interface between the second deck and the filler. Further, both the first unevenness and the second unevenness have inclined portions extending diagonally in the direction perpendicular to the bridge axis and in the direction of the bridge axis. Due to this inclined portion, a part of the interface between the first deck and the filler and a part of the interface between the second deck and the filler are slanted in the direction perpendicular to the bridge axis and the direction of the bridge axis, respectively. can do. Therefore, in this inclined portion, a part of the pulling force is decomposed into a force in the parallel direction of the interface, so that the resistance to the pulling force can be increased. As a result, it is possible to suppress that the weakness is that the resistance to the pulling force is small, so that it is possible to avoid the situation where the floor slab and the filler are cracked due to the pulling. Therefore, the strength of the interface between the deck and the filler can be increased.

Further, both the first end face and the second end face may be inclined in a direction in which they protrude from each other toward the vertical downward direction. In this case, since the first end face and the second end face are inclined so as to protrude toward the vertically downward direction, even if a force is applied to the filling portion from the vertically upper side, the first end face and the second end face that are inclined cause the first end face and the second end face to be inclined. It is possible to increase the shear resistance of the 1st floor slab, the 2nd floor slab and the stuffed portion. Therefore, the durability of the first floor slab, the second floor slab, and the padded portion can be enhanced.

Further , each of the first reinforcing bar and the second reinforcing bar protrudes from the convex portion of the unevenness to the padded portion. Therefore, the protruding lengths of the first reinforcing bar and the second reinforcing bar can be shortened, and the first floor slab having the first reinforcing bar and the second floor slab having the second reinforcing bar can be easily manufactured. ..

Further, the first floor slab has a first reinforcing bar protruding from the first end surface and a first fixing body provided on the first reinforcing bar, and the second floor slab has a second reinforcing bar protruding from the second end surface. And a second fixing body provided on the second reinforcing bar, and at least one of the first fixing body and the second fixing body may be made of either ceramic, stainless steel or resin. In this case, since the ceramic, stainless steel, and resin are materials that do not rust, it is possible to prevent the first fixing body or the second fixing body from rusting.

Further, as a configuration that preferably exhibits the above-mentioned action and effect, specifically, the filler may be stuffed concrete. Further, both the first floor slab and the second floor slab may be made of precast. When both the first floor slab and the second floor slab are made of precast, the first floor slab and the second floor slab can be manufactured in advance at the factory before being transported to the site, so that the joining work at the site can be performed promptly. It can be carried out. Therefore, it contributes to the improvement of workability.

The joining method according to the present invention is a second slab extending in the bridge axis direction, the bridge axis perpendicular direction orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction. It is a joining method for joining slabs, in which the first slab has a first end face, the second slab has a second end face, and the first end face has a height direction. The first unevenness having an inclined portion extending along the direction perpendicular to the bridge axis and extending diagonally to the direction perpendicular to the bridge axis and the direction of the bridge axis is formed, and the second end surface is viewed from the height direction. A second unevenness is formed that sometimes extends along the direction perpendicular to the bridge axis and has an inclined portion extending diagonally in the direction perpendicular to the bridge axis and in the direction of the bridge axis. A step of abutting the first end face and the second end face so that the portions face each other along the bridge axis direction, and a step of filling a filler between the first end face and the second end face are provided.

In the joining method described above, the first deck has a first end face extending in the direction perpendicular to the bridge axis and the height direction, and the second deck has a second end face extending in the direction perpendicular to the bridge axis and the height direction. A bonded structure is constructed by filling a filler between the first end face and the second end face. The first unevenness including the inclined portion is formed on the first end surface, the second unevenness including the inclined portion is formed on the second end surface, and the concave portion of the first unevenness and the convex portion of the second unevenness are formed. The first end face and the second end face are butted so as to face each other along the bridge axis direction. Therefore, due to the inclined portion, a part of the interface between the first deck and the filler and a part of the interface between the second deck and the filler are oblique to the bridge axis perpendicular direction and the bridge axis direction, respectively. Can be. Therefore, in the inclined portion, a part of the tensile force can be decomposed into a force in the parallel direction of the interface, so that the resistance to the tensile force can be increased. As a result, it is possible to suppress that the weakness is that the resistance to the pulling force is small, so that it is possible to avoid the situation where the floor slab and the filler are cracked due to the pulling. Therefore, the strength of the interface between the deck and the filler can be increased.

Further, in the above-mentioned joining method, the first floor slab has a first reinforcing bar protruding from the first end surface, and the second floor slab has a second reinforcing bar protruding from the second end surface, and is filled with a filler. Before the step of attaching the first fixing body to the first reinforcing bar, the step of attaching the second fixing body to the second reinforcing bar may be provided. In this case, by providing a step of attaching the fixing body before the step of filling the filler, it becomes possible to attach the fixing body at the site. Therefore, since the step of transporting the first floor slab and the second floor slab to the fixing body processing factory can be omitted, the first floor slab and the second floor slab can be efficiently transported.

Further, in the above-mentioned joining method, a step of roughening the first end face and the second end face may be provided before the step of filling the filler. In this case, since minute irregularities can be formed on the first end surface and the second end surface by roughening, the strength of the interface can be further increased.

According to the present invention, the strength of the interface between the deck and the filler can be increased.

It is a vertical sectional view which shows the joining structure which concerns on 1st Embodiment. It is a perspective view which shows the 1st floor slab, the 2nd floor slab and the girder material of the joint structure of FIG. It is an enlarged perspective view of the packing part between the 1st floor slab and the 2nd floor slab of FIG. It is a top view which shows the filling part of FIG. It is a perspective view which shows the formwork used when manufacturing the 1st floor slab and the 2nd floor slab of FIG. It is a top view which shows the joining structure which concerns on 2nd Embodiment. It is a top view which shows the joint structure which concerns on 3rd Embodiment. It is a graph which shows the relationship between the gradient of the inclined part (hypotenuse) and the tensile strength in the joint structure which concerns on Example.

Hereinafter, embodiments of the joining structure and joining method according to the present invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicate description will be omitted as appropriate. In addition, the drawings are partially exaggerated for ease of understanding, and the dimensions and the like are not limited to those described in the drawings.

(First Embodiment)
FIG. 1 is a vertical cross-sectional view showing a joint structure 1 in which a first floor slab 10 and a second floor slab 20 are joined. For example, both the first floor slab 10 and the second floor slab 20 are made of concrete. The joining structure 1 shows a structure in which the first floor slab 10 and the second floor slab 20 are connected via a filler 30. The first deck 10 and the second deck 20 are, for example, precast decks forming a bridge of a road bridge. A bridge of a road bridge is composed of a plurality of decks arranged along the bridge axial direction D1. Some of the plurality of floor slabs are referred to as the first floor slab 10 and the second floor slab 20. For example, an asphalt layer (paving layer) is provided on the first floor slab 10 and the second floor slab 20 via a waterproof layer.

The shape, size and material of the first deck 10 are, for example, the same as the shape, size and material of the second deck 20. Therefore, in order to avoid duplication, the description of the second floor slab 20 will be omitted as appropriate. The shape, size and material of the first floor slab 10 may be different from the shape, size and material of the second floor slab 20.

For example, the first floor slab 10 and the second floor slab 20 are manufactured in advance at the factory, and the pre-manufactured first floor slab 10 and the second floor slab 20 are transported to the site. The connecting direction in which the first deck 10 and the second deck 20 are connected and the bridge axis direction D1 coincide with each other. The first floor slab 10 and the second floor slab 20 are placed on, for example, the girder material 2. The girder 2 is a steel material extending in the bridge axial direction D1, and the direction in which the first deck 10, the filler 30 and the second deck 20 are lined up and the direction in which the girder 2 extends coincide with each other.

That is, the first floor slab 10 and the second floor slab 20 are provided on the upper part of the girder member 2 and are joined to each other along the bridge axial direction D1 in which the girder member 2 extends. The direction in which the first deck 10 and the second deck 20 are joined is along the bridge axial direction D1 in which the girder 2 extends. For example, the direction in which the first deck 10 and the second deck 20 are joined is parallel to the bridge axial direction D1 in which the girder 2 extends, but may not be parallel to the bridge axial direction D1. It may intersect with respect to the bridge axis direction D1.

The first deck 10 includes a rectangular parallelepiped first deck main body 11, a first reinforcing bar 12 extending in the bridge axis direction D1, and a reinforcing bar 14 intersecting (for example, orthogonal to) the first reinforcing bar 12. The second floor slab 20 includes a second floor slab main body 21, a second reinforcing bar 22, and a reinforcing bar 24 similar to the first floor slab main body 11, the first reinforcing bar 12, and the reinforcing bar 14.

The first floor slab main body 11 and the second floor slab main body 21 are, for example, concrete precast blocks and form a floor slab portion of a road bridge. As an example, both the first floor slab main body 11 and the second floor slab main body 21 may be made of ultra high reinforced concrete (UFC).

As shown in FIGS. 1 and 2, the first deck main body 11 and the second deck main body 21 constitute, for example, a road surface portion extending in the bridge axis direction D1 and the bridge axis perpendicular direction D2. That is, the upper surface 11b of the first deck main body 11 and the upper surface 21b of the second deck main body 21 form the road surface of the road bridge and receive the load of a vehicle or the like. The upper surface 11b and the upper surface 21b have a rectangular shape extending long in the direction D2 perpendicular to the bridge axis. The first floor slab main body 11 and the second floor slab main body 21 have a thickness in the height direction D3.

The height direction D3 is a direction orthogonal to both the bridge axis direction D1 and the bridge axis perpendicular direction D2, and the bridge axis direction D1 and the bridge axis perpendicular direction D2 are orthogonal to each other. Further, the first end surface 11a located at one end of the bridge axial direction D1 of the first deck main body 11 and the second end surface 21a located at one end of the bridge axial direction D1 of the second deck main body 21 are connected to each other. The joining structure 1 is constructed by. The first end surface 11a and the second end surface 21a face each other along the bridge axial direction D1.

The first end surface 11a and the second end surface 21a are, for example, roughened. Both the first end surface 11a and the second end surface 21a are inclined surfaces that incline in a direction in which they protrude from each other as they go vertically downward. That is, the first end surface 11a extends toward the second end surface 21a toward the vertical downward direction, and the second end surface 21a extends toward the first end surface 11a toward the vertical downward direction.

The distance between the first end surface 11a and the second end surface 21a becomes shorter as it goes vertically downward. In other words, both the first end surface 11a and the second end surface 21a are inclined with respect to the vertical surface S, and the inclination angle of the first end surface 11a with respect to the vertical surface S is, for example, 5 ° or more and 15 ° or less. Is. The inclination angle of the second end surface 21a with respect to the vertical surface S is also, for example, 5 ° or more and 15 ° or less. However, these values can be changed as appropriate.

The first reinforcing bar 12 is embedded in the first floor slab main body 11 and protrudes in a rod shape from the first end surface 11a. The first reinforcing bar 12 has a protruding portion 12a protruding from the first end surface 11a and an embedded portion 12b embedded in the first deck main body 11. The projecting portion 12a extends linearly toward the second deck 20, and the embedded portion 12b continuously extends from each projecting portion 12a in the bridge axial direction D1.

The first reinforcing bar 12 is painted, for example. By painting the first reinforcing bar 12, the rust preventive effect on the first reinforcing bar 12 is exhibited. The same applies to the second reinforcing bar 22. As an example, the first reinforcing bar 12 and the second reinforcing bar 22 are painted on the raw material of the reinforcing bar, and after being painted and transported to the floor slab manufacturing factory, the first floor slab main body 11 and the second floor slab main body are used. It will be embedded in each of the 21.

A plurality of first reinforcing bars 12 are arranged in the first floor slab 10. The protrusion 12a is, for example, a shearing key that protrudes from the first end surface 11a toward the second end surface 21a. A plurality of protrusions 12a are arranged along the bridge axis perpendicular direction D2, and a plurality (for example, two) are arranged along the height direction D3. The base end of the protrusion 12a located at the lower stage of the height direction D3 is located closer to the second deck 20 than the base end of the protrusion 12a located at the upper stage.

The configuration and operation of the second reinforcing bar 22 are, for example, the same as the configuration and operation of the first reinforcing bar 12. The second reinforcing bar 22 is embedded in the second floor slab main body 21 and protrudes from the second end surface 21a in a rod shape. The second reinforcing bar 22 has a protruding portion 22a protruding from the second deck main body 21 and an embedded portion 22b embedded in the second deck main body 21. The arrangement of the protrusions 22a is, for example, the same as the arrangement of the protrusions 12a, and the height of each protrusion 22a is the same as the height of each protrusion 12a.

The first fixing body 13 is provided on the protruding portion 12a of the first reinforcing bar 12. The first fixing body 13 is attached to, for example, the tip of the protrusion 12a. The first fixing body 13 has an enlarged diameter portion with respect to the first reinforcing bar 12, and can be attached to the first reinforcing bar 12. The first fixing body 13 has, for example, a tubular shape having a female screw inside, and is attached to the first reinforcing bar 12 with an adhesive inside. The first fixing body 13 is made of a material that does not rust, such as ceramic, stainless steel, or resin.

Since the first fixing body 13 is made of a material that does not rust in this way, the first reinforcing bar 12 to which the first fixing body 13 is attached does not need to be embedded in a deep position in order to secure the reinforcing bar cover. It is possible to prevent the fixing body 13 from rusting. Therefore, the first reinforcing bar 12 can be arranged at a position close to the upper surface 30a of the filler 30. The first fixing body 13 may be made of a rust-preventive material such as a metal that has been subjected to a rust-preventive treatment. A second fixing body 23 is provided on the protruding portion 22a of the second reinforcing bar 22, and the configuration, arrangement, and material of the second fixing body 23 are, for example, the same as the configuration, arrangement, and material of the first fixing body 13. ..

The filler 30 is filled in the filling portion A (joint space, joint space) formed between the first end surface 11a and the second end surface 21a. The upper surface 30a of the filler 30 is flush with, for example, the upper surface 11b of the first deck main body 11 and the upper surface 21b of the second deck main body 21. The filler 30 may be made of, for example, the above-mentioned ultra-high-strength fiber-reinforced concrete, or may be made of a material other than the ultra-high-strength fiber-reinforced concrete.

In the joint structure 1, the projecting portion 12a of the first reinforcing bar 12 projecting linearly and the projecting portion 22a of the second reinforcing bar 22 projecting linearly overlap each other inside the filler 30. That is, the protruding portion 12a of the first reinforcing bar 12 and the protruding portion 22a of the second reinforcing bar 22 overlap each other in the bridge axial direction D1. Further, inside the filler 30, a plurality of reinforcing reinforcing bars 3 extend in the direction D2 perpendicular to the bridge axis.

As shown in FIGS. 3 and 4, the first concavo-convex 11a having a corrugated shape is formed on the first end surface 11a, and the second concavo-convex 21c having a corrugated shape is formed on the second end surface 21a. The height direction (recessing direction and protruding direction) of the first unevenness 11c and the second unevenness 21c coincides with the bridge axis direction D1. That is, both the first unevenness 11c and the second unevenness 21c extend in the direction perpendicular to the bridge axis D2 while meandering so as to bend in the bridge axis direction D1.

The first unevenness 11c includes a convex portion 11d, a concave portion 11e, and an inclined portion 11f extending from the convex portion 11d to the concave portion 11e. When viewed from the height direction D3, the convex portions 11d and the concave portions 11e are alternately arranged along the bridge axis perpendicular direction D2. The convex portion 11d and the pair of inclined portions 11f, and the concave portion 11e and the pair of inclined portions 11f form, for example, a trapezoidal shape. When viewed from the height direction D3, the convex portion 11d and the concave portion 11e extend in parallel with each other, for example.

As an example, the height H1 of the convex portion 11d with respect to the concave portion 11e (wave height, the length of the bridge axis direction D1) and the height H2 of the convex portion 21d with respect to the concave portion 21e are 10 mm or more and 30 mm or less, and as an example, 20 mm. be. The inclination angle θ1 of the inclined portion 11f with respect to the convex portion 11d when viewed from the height direction D3 is, for example, 35 ° or more and 50 ° or less, and 45 ° as an example. Like the first unevenness 11c, the second unevenness 21c includes a convex portion 21d, a concave portion 21e, and an inclined portion 21f. Both the first unevenness 11c and the second unevenness 21c extend along the height direction D3 and are inclined in a direction in which they protrude from each other in the vertical downward direction.

In the direction D2 perpendicular to the bridge axis, the position of the convex portion 11d of the first unevenness 11c is the same as the position of the concave portion 21e of the second unevenness 21c, and the position of the concave portion 11e of the first unevenness 11c is the convex of the second unevenness 21c. It is the same as the position of the part 21d. When viewed from the height direction D3, the first unevenness 11c and the second unevenness 21c forming a corrugated shape are in phase with each other. That is, in the direction D2 perpendicular to the bridge axis, the second unevenness 21c is recessed in the protruding portion (convex portion 11d) of the first unevenness 11c, and the second unevenness 21c is recessed in the recessed portion (concave portion 11e) of the first unevenness 11c. ..

The first reinforcing bar 12 protrudes from the convex portion 11d of the first unevenness 11c to the filling portion A, and the second reinforcing bar 22 protrudes from the convex portion 21d of the second unevenness 21c to the filling portion A. The first reinforcing bar 12 extends toward the second deck 20 side of the center line C extending in the direction perpendicular to the bridge axis D2 at the center of the bridge axis direction D1 of the packing portion A, and the second reinforcing bar 22 extends to the center line C. It extends to the 10th side of the first floor slab. The first fixing body 13 attached to the first reinforcing bar 12 faces the recess 21e of the second unevenness 21c along the bridge axis direction D1, and the second fixing body 23 faces the recess 11e of the first unevenness 11c. They face each other along the direction D1.

The first reinforcing bar 12 and the second reinforcing bar 22 are alternately arranged along the bridge axis perpendicular direction D2, and are arranged so as to be evenly spaced from each other along the bridge axis perpendicular direction D2, for example. For example, the period P1 of the first reinforcing bar 12 arranged along the bridge axis perpendicular direction D2 is the same as the period of the first unevenness 11c, and the period P2 of the second reinforcing bar 22 arranged along the bridge axis perpendicular direction D2. Is the same as the period of the second unevenness 21c. Further, the period P1 and the period P2 are, for example, the same as each other, and the values of the period P1 and the period P2 are, for example, 150 mm.

By the way, the first floor slab 10 having the first unevenness 11c and the second floor slab 20 having the second unevenness 21c are manufactured by, for example, the formwork F shown in FIG. The formwork F includes a plate-shaped wooden or metal formwork body F1 and a plurality of unevenness-forming members F2 fixed to the flat surface F11 of the formwork body F1. An insertion hole F12 through which the first reinforcing bar 12 or the second reinforcing bar 22 is inserted is formed in the flat surface F11 of the formwork main body F1. The position where the insertion hole F12 is formed corresponds to the position of the first reinforcing bar 12 or the second reinforcing bar 22.

The unevenness forming member F2 is made of, for example, a rubber material. The unevenness forming member F2 is attached to a portion of the mold body F1 avoiding the insertion hole F12 of the flat surface F11. The unevenness-forming member F2 has, for example, a square columnar shape having a trapezoidal bottom surface, and has a first side surface F21 and a pair of second side surfaces F22 provided on both sides of the first side surface F21. The first side surface F21 is a surface forming the recesses 11e and 21e, and each second side surface F22 is a surface forming the inclined portions 11f and 21f.

The convex portions 11d and 21d are portions where the unevenness forming member F2 of the flat surface F11 is not attached, and are formed by the portions where the insertion holes F12 are formed. As described above, when the reinforcing bars 12 and 22 protrude from the convex portions 11d and 21d, it is not necessary to form an insertion hole for passing the reinforcing bar in the unevenness forming member F2, and the insertion hole F12 is formed only in the formwork body F1. Since the reinforcing bars 12 and 22 need only be passed through the insertion holes F12 of the formwork body F1, the first floor slab 10 and the second floor slab 20 can be efficiently manufactured with a simple configuration.

Next, a joining method for joining the first floor slab 10 and the second floor slab 20 will be described. First, the first floor slab 10 and the second floor slab 20 are prepared (preparation step). For example, the raw material of the reinforcing bar is transported to a painting factory, the reinforcing bar is transported to the floor slab manufacturing factory after the reinforcing bar is painted, and the first floor slab 10 and the second floor slab 20 are transported to the floor slab manufacturing factory using the formwork F. To manufacture. Specifically, the first floor slab 10 in which the first reinforcing bar 12 is embedded in the first floor slab main body 11 and the protruding portion 12a of the first reinforcing bar 12 protrudes from the first end surface 11a, and the second reinforcing bar 22 is the second. A second deck 20 which is embedded in the deck main body 21 and has a protruding portion 22a of the second reinforcing bar 22 projecting from the second end surface 21a is manufactured.

Further, the first end surface 11a of the first floor slab main body 11 and the second end surface 21a of the second floor slab main body 21 are roughened (step of roughening). The roughening is performed in the factory, for example, before the first floor slab 10 and the second floor slab 20 are transported to the site. As a specific example, after applying a retarding agent that delays curing to the portion of the formwork F facing the end faces 11a and 21a, placing concrete on the formwork F and removing the mold, the end faces 11a and 21a are subjected to. It is washed out by the water jet method. By this washing out, roughening is performed to form irregularities on the end faces 11a and 21a. It is possible to improve the adhesive force of the filler 30 to the first end surface 11a and the second end surface 21a by roughening.

Next, for example, the first floor slab 10 and the second floor slab 20 are lifted by a lifting machine, and the first floor slab 10 and the second floor slab 20 are arranged on the girder material 2. As shown in FIG. 2, the first deck 10 and the second deck 20 are arranged so as to be lined up along the bridge axis direction D1 in which the girder 2 extends. At this time, the first end surface 11a of the first floor slab 10 and the second end surface 21a of the second floor slab 20 are opposed to each other along the bridge axis direction D1.

As shown in FIG. 4, the second end surface 21a is butted against the first end surface 11a so that the concave portion 11e of the first floor slab 10 and the convex portion 21d of the second floor slab 20 face each other along the bridge axial direction D1. At the same time, a filling portion A (filling space of the filler 30) is formed between the first end surface 11a and the second end surface 21a (butting step). At this time, the convex portion 11d of the first floor slab 10 and the concave portion 21e of the second floor slab 20 face each other along the bridge axis direction D1. Further, the first fixing body 13 is attached to the first reinforcing bar 12 protruding from the convex portion 11d, and the second fixing body 23 is attached to the second reinforcing bar 22 protruding from the convex portion 21d (step of attaching the fixing body). ). The step of attaching the fixing body can be executed at any timing as long as it is before the step of filling described later.

After executing the above-mentioned matching step, for example, formwork is installed on both sides and the lower side of the bridge axis perpendicular direction D2 in the first deck 10 and the second deck 20. This formwork closes both sides and the lower side of the filling portion A in the direction perpendicular to the bridge axis D2, arranges the reinforcing reinforcing bar 3 in the filling portion A, and then fills the filling portion A with the filler 30 (filling). Process to do). At this time, the filler 30 is placed in the filling portion A from above, and the protruding portion 12a of the first reinforcing bar 12, the protruding portion 22a of the second reinforcing bar 22, and the reinforcing reinforcing bar 3 are embedded in the filler 30. Then, after the filler 30 is cured and the mold is removed, the joint structure 1 shown in FIG. 1 is completed.

Next, the operation and effect of the joining structure 1 and the joining method according to the present embodiment will be described. In the joining structure 1 and the joining method according to the present embodiment, the first deck 10 has a first end surface 11a extending in the direction perpendicular to the bridge axis D2 and the height direction D3, and the second deck 20 has a direction D2 perpendicular to the bridge axis. And has a second end face 21a extending in the height direction D3. The joining structure 1 is constructed by filling the filler 30 between the first end surface 11a and the second end surface 21a.

As shown in FIGS. 1 and 3, when viewed from the height direction D3, the first unevenness 11c extending in the direction perpendicular to the bridge axis D2 is formed on the first end surface 11a of the first deck 10. The second end surface 21a of the second deck 20 is formed with a second unevenness 21c extending in the direction D2 perpendicular to the bridge axis. The first end surface 11a forms an interface between the first deck 10 and the filler 30, and the second end surface 21a forms an interface between the second deck 20 and the filler 30. In the present embodiment, by having the first unevenness 11c and the second unevenness 21c, it is possible to increase the adhesion area of the end faces 11a and 21a to the filler 30, so that the resistance to pulling (tensile resistance) is increased. Can be done.

Further, both the first unevenness 11c and the second unevenness 21c have inclined portions 11f and 21f extending diagonally with respect to the bridge axis perpendicular direction D2 and the bridge axis direction D1. Due to the inclined portions 11f and 21f, a part of the interface between the first deck 10 and the filler 30 and a part of the interface between the second deck 20 and the filler 30 are respectively formed in the bridge axis perpendicular direction D2 and the bridge axis perpendicular direction D2. It can be slanted with respect to the bridge axis direction D1.

Therefore, at the inclined portions 11f and 21f, a part of the tensile force is decomposed into a force in the parallel direction of the interface (in-plane direction of the plane extending in the direction perpendicular to the bridge axis D2 and the height direction D3), so that the pulling force is applied. The resistance can be increased. As a result, it is possible to suppress that the weakness is that the resistance to the pulling force is small, so that it is possible to avoid a situation in which the floor slabs 10 and 20 and the filler 30 are cracked due to the pulling. Therefore, the strength of the interface between the floor slabs 10 and 20 and the filler 30 can be increased. In particular, in the present embodiment, the first deck 10 and the second deck 20 are arranged along the bridge axial direction D1 in which the girder 2 extends, and the first end face 11a and the second end face 21a are subjected to out-of-plane shearing. receive. In the joint structure 1 that receives out-of-plane shear in this way, crack resistance can be suitably increased.

Further, since it is possible to suppress cracking and peeling, it is possible to prevent water from infiltrating through the cracks and corroding the first reinforcing bar 12, the second reinforcing bar 22, the reinforcing reinforcing bar 3, and the like. can. In particular, in the present embodiment, the first floor slab 10 and the second floor slab 20 are precast floor slabs forming the floor slabs of the road bridge, and long-term road bridges do not require repair work when cracked. It is possible to avoid situations that interfere with use. Therefore, long-term use of the road can be realized.

Further, both the first end surface 11a and the second end surface 21a are inclined in a direction in which they protrude from each other as they go vertically downward. Therefore, since the first end surface 11a and the second end surface 21a are inclined so as to protrude toward the vertically downward direction, the first end surface 11a and the second end surface 11a and the second end surface are inclined even if a force is applied to the filling portion A from the vertically upper side. The end face 21a can increase the shear resistance of the first floor slab 10, the second floor slab 20, and the stuffing portion A. Therefore, the durability of the first floor slab 10, the second floor slab 20, and the padding portion A can be enhanced.

Further, as shown in FIG. 4, the first floor slab 10 has a first reinforcing bar 12 protruding from the first end surface 11a, and the second floor slab 20 has a second reinforcing bar 22 protruding from the second end surface 21a. The first reinforcing bar 12 protrudes from the convex portion 11d of the first unevenness 11c, and the second reinforcing bar 22 protrudes from the convex portion 21d of the second unevenness 21c. Therefore, each of the first reinforcing bar 12 and the second reinforcing bar 22 protrudes from the convex portion of the unevenness to the filling portion A.

Therefore, the protruding lengths of the first reinforcing bar 12 and the second reinforcing bar 22 can be shortened, and the first floor slab 10 having the first reinforcing bar 12 and the second floor slab 20 having the second reinforcing bar 22 can be manufactured. It can be done easily. Specifically, as described above, it is not necessary to form an insertion hole for passing the reinforcing bar in the unevenness forming member F2 of the formwork F, and the insertion hole F12 is formed only in the formwork body F1 to form the formwork body F1. Since the reinforcing bars 12 and 22 need only be passed through the insertion holes F12 of the above, the first floor slab 10 and the second floor slab 20 can be efficiently manufactured.

Further, the first floor slab 10 has a first reinforcing bar 12 protruding from the first end surface 11a and a first fixing body 13 provided on the first reinforcing bar 12, and the second floor slab 20 has a second end surface. It has a second reinforcing bar 22 protruding from 21a and a second fixing body 23 provided on the second reinforcing bar 22, and at least one of the first fixing body 13 and the second fixing body 23 is made of ceramic, stainless steel, and resin. It is composed of any of. Therefore, since the ceramic, stainless steel, and resin are materials that do not rust, it is possible to prevent the first fixing body 13 and the second fixing body 23 from rusting.

Further, the filler 30 is made of interstitial concrete, and the first floor slab 10 and the second floor slab 20 are both made of precast. Therefore, since the first floor slab 10 and the second floor slab 20 can be manufactured in advance at the factory before being transported to the site, the joining work at the site can be performed promptly. Therefore, it contributes to the improvement of workability.

Further, in the joining method according to the present embodiment, before the step of filling the filler 30, the step of attaching the first fixing body 13 to the first reinforcing bar 12 and the step of attaching the second fixing body 23 to the second reinforcing bar 22 are performed. Be prepared. In this case, by providing the steps of attaching the fixing bodies 13 and 23 before the step of filling the filler 30 at the latest, the fixing bodies 13 and 23 can be attached on site. Therefore, since the step of transporting the first floor slab 10 and the second floor slab 20 to the fixing body processing factory can be omitted, the first floor slab 10 and the second floor slab 20 can be efficiently transported.

Further, in the above-mentioned joining method, a step of roughening the first end surface 11a and the second end surface 21a is provided before the step of filling the filler 30. Therefore, fine irregularities can be formed on the first end surface 11a and the second end surface 21a by roughening, and the strength of the interface can be further increased, so that the adhesive applied to the end surfaces 11a and 21a is unnecessary. Can be done.

(Second Embodiment)
Next, the joining structure 41 according to the second embodiment will be described with reference to FIG. The joint structure 41 according to the second embodiment has the shape of the first unevenness 51c of the first floor slab main body 51 of the first floor slab 50 and the second unevenness 61c of the second floor slab main body 61 of the second floor slab 60. The shape is different from each of the first unevenness 11c and the second unevenness 21c of the first embodiment. In the following description, the description overlapping with the first embodiment will be omitted as appropriate.

As shown in FIG. 6, the first unevenness 51c is formed on the first end surface 51a of the first deck main body 51, and the second unevenness 61c is formed on the second end surface 61a of the second deck main body 61. Has been done. The first unevenness 51c and the second unevenness 61c have a trapezoidal shape having convex portions 51d and 61d, concave portions 51e and 61e, and inclined portions 51f and 61f. The inclination angle θ2 of the inclined portion 51f with respect to the convex portion 51d when viewed from the height direction D3 is, for example, larger than 0 ° and 35 ° or less, and is 30 ° as an example. The same applies to the inclination angle of the inclined portion 61f with respect to the convex portion 61d when viewed from the height direction D3.

As described above, the joint structure 41 according to the second embodiment has inclined portions 51f and 61f extending diagonally with respect to the bridge axis direction D1 and the bridge axis perpendicular direction D2. Therefore, at the inclined portions 51f and 61f, a part of the tensile force is decomposed into a force in the parallel direction of the interface, so that the resistance force against the tensile force can be increased. As a result, it is possible to suppress that the weakness is that the resistance to the tensile force is small, and it is possible to avoid the situation where the floor slabs 50 and 60 and the filler 30 are cracked due to the tension. Therefore, the same effect as that of the first embodiment can be obtained.

(Third Embodiment)
Subsequently, the joining structure 71 according to the third embodiment will be described with reference to FIG. 7. In the joint structure 71, the shape of the first unevenness 81c of the first floor slab main body 81 of the first floor slab 80 and the shape of the second unevenness 91c of the second floor slab main body 91 of the second floor slab 90 are described above. It is different from the unevenness of the embodiment.

The first unevenness 81c is formed on the first end surface 81a of the first floor slab main body 81, and the second unevenness 91c is formed on the second end surface 91a of the second floor slab main body 91. The first unevenness 81c has a convex portion 81d, a concave portion 81e and an inclined portion 81f, the second unevenness 91c has a convex portion 91d, a concave portion 91e and an inclined portion 91f, and the first unevenness 81c and the second unevenness 91c are both tables. It is a shape. The inclination angle θ3 of the inclined portion 81f with respect to the convex portion 81d is, for example, larger than 50 ° and 90 ° or less, and is 75 ° as an example. The same applies to the inclination angle of the inclined portion 91f with respect to the convex portion 91d.

The joining structure 71 according to the third embodiment also has inclined portions 81f and 91f as in each of the above-described embodiments. Therefore, at the inclined portions 81f and 91f, a part of the tensile force is decomposed into a force in the parallel direction of the interface, so that the resistance to the tensile force can be increased. As a result, it is possible to suppress that the weakness is that the resistance to the pulling force is small. Therefore, it is possible to avoid a situation in which cracks occur from the interface between the floor slabs 80 and 90 and the filler 30, so that the same effects as those of the above-described embodiments can be obtained.

Although each embodiment of the joining structure and the joining method according to the present invention has been described above, the present invention is not limited to each of the above-described embodiments, and the present invention is modified to the extent that the gist described in each claim is not changed. You may. That is, the shape, size, material and arrangement mode of each part of the joining structure, and the content and order of each step of the joining method can be appropriately changed.

For example, in the above-described embodiment, the precast first floor slab 10 and the second floor slab 20 have been described. However, the first floor slab and the second floor slab may or may not be made of half precast, for example. For example, the first unevenness of the first floor slab and the second unevenness of the second floor slab may be formed by in-situ casting.

Further, in the above-described embodiment, the trapezoidal first unevenness and the second unevenness have been described. However, the shapes of the first unevenness and the second unevenness do not have to be trapezoidal and can be changed as appropriate. For example, the shape of the first concavo-convex and the second concavo-convex may be a sine wave, and each inclined portion of the first concavo-convex and the second concavo-convex may be flat or curved.

Further, in the above-described embodiment, the first end surface 11a and the second end surface 21a that are inclined in the direction of protruding from each other toward the vertical downward direction have been described. However, the inclination directions of the first end face and the second end face are not limited to the above and can be changed as appropriate. Further, in the above-described embodiment, the first fixing body 13 attached to the tip of the first reinforcing bar 12 and the second fixing body 23 attached to the tip of the second reinforcing bar 22 have been described. However, the mounting location, mounting method, shape, size and material of the first fixing body and the second fixing body are not limited to the above-described embodiments and can be appropriately changed.

Further, in the above-described embodiment, the first reinforcing bar 12 protruding from the convex portion 11d and the second reinforcing bar 22 protruding from the convex portion 21d have been described. However, instead of the first reinforcing bar 12 and the second reinforcing bar 22, a first reinforcing bar protruding from the recess or a second reinforcing bar protruding from the recess may be provided. In this way, the position where the reinforcing bar protrudes can be changed as appropriate. Furthermore, the period of the first reinforcing bar arranged along the direction perpendicular to the bridge axis, the period of the second reinforcing bar arranged along the direction perpendicular to the bridge axis, the period of the first unevenness, and the period of the second unevenness are appropriately changed. It is possible.

Further, in the above-described embodiment, an example of manufacturing the first floor slab 10 and the second floor slab 20 by using the formwork F including the formwork main body F1 and the unevenness forming member F2 has been described. However, the formwork for manufacturing the first floor slab and the second floor slab is not limited to the formwork F and can be appropriately changed. Further, in the above-described embodiment, the road bridge has been described as an example of the structure formed by the joint structure 1 including the first floor slab 10 and the second floor slab 20. However, the joining structure and joining direction according to the present invention can be applied to structures other than road bridges.

(Example)
Next, an embodiment of the joint structure will be described with reference to FIG. The present invention is not limited to the following examples. In the experiment according to the example, the relationship between the inclination angle (inclination) of the inclined portion in the first unevenness and the second unevenness and the tensile strength was verified. The joining structure of Examples 1 to 3 is a joining structure having a first unevenness and a second unevenness, and the joining structure of Comparative Example 1 does not have the first unevenness and the second unevenness (that is, the first end face and the second end face). Is a flat surface) It is a joint structure.

The joining structure of the first embodiment is the joining structure 1 in which the inclination angle of the inclined portion is 45.0 ° as shown in FIG. 4, and the joining structure of the second embodiment is the joining structure of the inclined portion as shown in FIG. The joining structure 41 has an inclination angle of 28.1 °, and the joining structure of the third embodiment is a joining structure 71 having an inclination angle of 76.0 ° as shown in FIG. Further, in each of Examples 1 to 3, the height (wave height) of the convex portion with respect to the concave portion was set to 20 mm.

The graph of FIG. 8 shows the results of tensile tests performed on Examples 1 to 3 and Comparative Example 1 above. As shown in FIG. 8, in the joint structure of Comparative Example 1 in which the first end face and the second end face are flat surfaces (gradient is 0 °), the tensile strength was 1.33 N / mm ² . On the other hand, it was found that the joint structure of Examples 1 to 3 having the first unevenness and the second unevenness on each of the end faces can have a tensile strength ^{higher than 1.33 N / mm 2.}

Further, in the joint structure of Example 2 in which the inclination angle of the inclined portion of the unevenness is 28.1 °, the tensile strength is 1.97 N / mm ² and the inclination angle is 45.0 °. In the structure, the tensile strength was 2.08 N / mm ² , and in the joint structure of Example 3 in which the inclination angle was 76.0 °, the tensile strength was 1.80 N / mm ² . Therefore, when the tensile strength of Example 1 in which the inclination angle of the inclined portion of the unevenness is 45.0 ° is higher than the tensile strength of Examples 2 and 3, and the inclination angle is 35 ° or more and 50 ° or less. It was found that the tensile strength can be further increased.

1,41,71 ... Joint structure, 2 ... Girder material, 3 ... Reinforcing bar, 10,50,80 ... First floor slab, 11,51,81 ... First floor slab body, 11a, 51a, 81a ... First End face, 11b ... Top surface, 11c, 51c, 81c ... First unevenness, 11d, 51d, 81d ... Convex part, 11e, 51e, 81e ... Concave part, 11f, 51f, 81f ... Inclined part, 12 ... First reinforcing bar, 12a ... Protruding part, 12b ... Embedded part, 13 ... First fixing body, 14 ... Reinforcing bar, 20, 60, 90 ... Second floor slab 21,61,91 ... Second floor slab body, 21a, 61a, 91a ... Second End face, 21b ... Top surface, 21c, 61c, 91c ... Second unevenness, 21d, 61d, 91d ... Convex part, 21e, 61e, 91e ... Concave part, 21f, 61f, 91f ... Inclined part, 22 ... Second reinforcing bar, 22a ... Protruding part, 22b ... Buried part, 23 ... Second fixing body, 24 ... Reinforcing bar, 30 ... Filling material, 30a ... Top surface, A ... Stuffing part, C ... Center line, D1 ... Bridge axis direction, D2 ... Bridge axis perpendicular Direction, D3 ... Height direction, F ... Formwork, F1 ... Formwork body, F2 ... Concavo-convex forming member, F11 ... Flat surface, F12 ... Insertion hole, F21 ... First side surface, F22 ... Second side surface, P1, P2 ... Period, S ... Lead face, θ1, θ2, θ3 ... Tilt angle.

Claims (8)

Girders extending in the direction of the bridge axis and
The first floor that is placed on the girder and extends in the bridge axis direction, the bridge axis perpendicular direction orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis perpendicular direction. Edition and
A second deck that is placed on the girder and faces the first deck and extends in the bridge axis direction, the bridge axis perpendicular direction, and the height direction.
The filler to be filled between the first floor slab and the second floor slab,
Equipped with
The first deck has a first end face facing the second deck along the bridge axis direction.
The second deck has a second end face facing the first deck along the bridge axis direction.
The first end surface has a first unevenness having an inclined portion extending along the direction perpendicular to the bridge axis when viewed from the height direction and extending diagonally with respect to the direction perpendicular to the bridge axis and the direction of the bridge axis. Is formed,
The second end surface has a second unevenness having an inclined portion extending along the direction perpendicular to the bridge axis when viewed from the height direction and extending diagonally with respect to the direction perpendicular to the bridge axis and the direction of the bridge axis. Is formed,
The first floor slab and the second floor slab are joined along the direction in which the girder extends .
The first deck has a first reinforcing bar protruding from the first end face.
The second deck has a second reinforcing bar protruding from the second end face.
The first reinforcing bar protrudes from the convex portion of the first unevenness and
The second reinforcing bar protrudes from the convex portion of the second unevenness.
Joined structure. Both the first end face and the second end face are inclined in a direction in which they protrude from each other as they go vertically downward.
The joining structure according to claim 1. The first deck has a first reinforcing bar protruding from the first end surface and a first fixing body provided on the first reinforcing bar.
The second deck has a second reinforcing bar protruding from the second end surface and a second fixing body provided on the second reinforcing bar.
At least one of the first fixing body and the second fixing body is made of any of ceramic, stainless steel and resin.
The joining structure according to claim 1 or 2. The filler is stuffed concrete,
The joint structure according to any one of claims 1 to 3. Both the first floor slab and the second floor slab are made of precast.
The joint structure according to any one of claims 1 to 4. The second slab is joined to the first slab extending in the bridge axis direction, the direction orthogonal to the bridge axis orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction. It ’s a joining method,
The first floor slab has a first end face and has a first end face.
The second deck has a second end face and has a second end face.
The first end surface has a first unevenness having an inclined portion extending along the direction perpendicular to the bridge axis when viewed from the height direction and extending diagonally with respect to the direction perpendicular to the bridge axis and the direction of the bridge axis. Is formed,
The second end surface has a second unevenness having an inclined portion extending along the direction perpendicular to the bridge axis when viewed from the height direction and extending diagonally with respect to the direction perpendicular to the bridge axis and the direction of the bridge axis. Is formed,
A step of abutting the first end surface and the second end surface so that the concave portion of the first unevenness and the convex portion of the second unevenness face each other along the bridge axis direction.
A step of filling a filler between the first end face and the second end face, and
A joining method that comprises. The first deck has a first reinforcing bar protruding from the first end face.
The second deck has a second reinforcing bar protruding from the second end face.
Prior to the step of filling the filler, a step of attaching the first fixing body to the first reinforcing bar and attaching the second fixing body to the second reinforcing bar is provided.
The joining method according to claim 6. Prior to the step of filling the filler, a step of roughening the first end face and the second end face is provided.
The joining method according to claim 6 or 7.

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