JP7282653B2 - Joining structure and joining method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joining structure and a joining method for joining floor slabs constituting a road.

Conventionally, various joint structures and joining methods for joining floor slabs constituting a road are known. Japanese Patent Application Laid-Open No. 2015-151768 describes a method for replacing a concrete floor slab for an elevated road and a replacement PC floor slab. This replacement PC floor slab is arranged on a plurality of main steel girders arranged so as to line up along the width direction of the road. This rebuilding method is performed in each of the primary construction section and the secondary construction section lined up along the width direction of the road.

The primary construction section indicates a section of the existing concrete floor slab that will be constructed prior to the secondary construction section. First, cut the boundary part between the primary construction part and the secondary construction part with the temporary support material installed on the lower surface of the boundary part between the primary construction part and the secondary construction part, and cut the boundary part on the secondary construction part side of the boundary part. The primary construction part will be removed after the guardrail is installed. At this time, the secondary construction part will be used as a road.

Subsequently, after installing the newly installed pretensioned precast PC slab on the steel girder in the primary construction section, the primary construction section is put into service as a road. Then, after removing the secondary construction section, a newly installed pretensioned precast PC plate is erected in the secondary construction section. After the construction of the primary construction part and the secondary construction part is completed in this manner, a series of steps of the rebuilding method is completed.

JP 2015-151768 A

The pretension precast PC slabs installed in each of the primary enforcement section and the secondary enforcement section described above are divided in the width direction of the road, and the end faces in the width direction of each pretension precast PC slab are flat surfaces. . In the replacement method described above, construction is performed by joining the flat surface in the width direction of one pretensioned precast PC plate to the flat surface in the width direction of the other pretensioned precast PC plate. Since the flat surfaces of a pair of pretensioned precast PC plates are joined together, there is room for improvement in terms of the rigidity of the joint.

In the rebuilding method described above, the end face of the pretensioned precast PC slab of the secondary construction part is joined to the end face of the pretensioned precast PC slab of the primary construction part while the primary construction part is in service as a road.

That is, while the pretension precast PC slab of the primary construction part is in use as a road, the pretension precast PC slab of the secondary construction part is joined to the pretension precast PC slab of the road of the primary construction part. Therefore, since the pretensioned precast PC slabs of the secondary construction part are joined to the pretensioned precast PC slabs of the primary construction part that are used as roads, the pretensioned precast PC floor slabs of the secondary construction part are joined to the vibrating precast slabs. There is a need.

That is, since the precast floor slabs must be joined to vibrating precast floor slabs that are in service as roads, a problem may arise in that the work of joining precast floor slabs cannot be performed efficiently. In addition, there is a concern that the precast floor slabs may collide with each other due to vibration, and one of the precast floor slabs may be chipped or cracked. Therefore, there is room for improvement in the quality of floor slabs that constitute roads.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a joining structure and a joining method that enable efficient joint work of precast floor slabs and improve the quality of the floor slabs by increasing the rigidity of the joints. do.

A joint structure according to the present invention is a joint structure including a first precast floor slab and a second precast floor slab that are divided in the width direction of a road and joined together along the width direction, wherein the first precast The floor slab has a first end surface facing the second precast floor slab along the width direction, and the second precast floor slab has a second end surface facing the first precast floor slab along the width direction. , one of a protrusion projecting in the width direction and a recess recessed in the width direction is formed on the first end face, and a protrusion projecting in the width direction and a recess recessed in the width direction are formed on the second end face. The other of the concave portions is formed, the convex portion fits into the concave portion, and the cushioning material arranged along either the convex portion or the concave portion, and the first precast floor slab and the second precast floor slab are embedded. tensioning means for tensioning both the first precast floor slab and the second precast floor slab along the width direction; and a filling material filled between the first end surface and the second end surface; It has a pair of upper and lower inclined surfaces and a bottom surface positioned between the pair of inclined surfaces. It has a first corner covering portion and a second corner covering portion covering a corner portion of the other inclined surface .

In this joint structure, the first end surface of the first precast floor slab and the second end surface of the second precast floor slab face each other along the width direction. The first end face has one of a protrusion projecting in the width direction and a recess recessed in the width direction, and the second end face has the other of the protrusion projecting in the width direction and a recess recessed in the width direction. Therefore, the first precast floor slab and the second precast floor slab are joined to each other by fitting the convex portion into the concave portion, so that the rigidity of the joint portion can be increased as compared with the case where the end faces are flat surfaces. . In this joint structure, the protrusion fits into the recess, and the cushioning material is arranged along either the protrusion or the recess. Therefore, when the second end surface of the second precast floor slab is joined to the first end surface of the first precast floor slab, even if the first precast floor slab is vibrating, the cushioning material will not cause the first end surface and the second end surface of the floor slab to move. By interposing therebetween, the second end surface can be efficiently joined to the first end surface. When joining the second end face of the second precast floor slab to the first end face of the first precast floor slab, the second end face is joined to the first end face via a cushioning material placed in either the convex portion or the concave portion. be done. Therefore, even when the first precast floor slab is vibrating, the cushioning material can prevent the second precast floor slab from colliding with the projections and recesses. As a result, the precast floor slab can be prevented from being chipped or cracked by the cushioning material, so that the quality of the floor slab can be improved.

Also, the cushioning material may be arranged so as to cover the corners of either the convex portion or the concave portion. By the way, when the second end surface of the second precast floor slab is joined to the first end surface of the first precast floor slab, the concave portion and the convex portion face each other. can be a part that is easily chipped. As described above, when the cushioning material is arranged to cover either corner of the projection or recess, direct collision with the corner of the projection or recess is suppressed and the corner is protected by the cushioning material. be able to. Therefore, it contributes to improving the quality of floor slabs.

In addition, the tension means is any one of the first precast steel material embedded in the first precast floor slab, the second precast steel material later inserted into the second precast floor slab, the first precast floor slab, and the second precast floor slab. and a coupler embedded in and connecting the first PC steel and the second PC steel to each other. In this case, the first PC steel material is embedded in the first precast floor slab, the second PC steel material is inserted in the second precast floor slab later, and the first PC steel material and the second PC steel material can be connected to each other by the coupler. By connecting the first PC steel member of the first precast floor slab and the second PC steel member of the second precast floor slab to each other by the coupler, the number of PC steel members in each floor slab can be made appropriate, thus reducing the cost of tensioning means. contributes to the reduction of

The joining method according to the present invention is a joining method comprising a first precast floor slab and a second precast floor slab that are divided in the width direction of the road and joined together along the bridge axis direction perpendicular to the width direction. a step of disposing a cushioning material in either a concave portion formed on a first end surface of the first precast floor slab or a convex portion formed on a second end surface of the second precast floor slab; a temporary tightening step of tensioning both the first precast floor slab and the second precast floor slab along the width direction by a tensioning means with the cushioning material sandwiched between the portions; and a final tightening step of tensioning both the first precast floor slab and the second precast floor slab along the width direction by tensioning means after the filler has hardened . It has a pair of slanted surfaces and a bottom surface positioned between the pair of slanted surfaces. It has one corner covering portion and a second corner covering portion covering the corner portion of the other inclined surface .

In this joining method, the protrusion formed on the second end face of the second precast member is fitted into the recess formed on the first end face of the first precast member, and the first precast member and the second precast member are joined to each other. be done. Therefore, compared with the case where the first end surface and the second end surface are flat surfaces, the rigidity of the joint portion can be increased. Moreover, the convex portion and the concave portion are fitted to each other with a cushioning material disposed therebetween. Therefore, when the second end surface of the second precast floor slab is joined to the first end surface of the first precast floor slab, even if the first precast floor slab is vibrating, the cushioning material is Joining can be efficiently performed by being interposed between them. Moreover, even if the first precast floor slab is vibrating, the shock absorbing material can prevent the second precast floor slab from colliding with the concave portion of the first precast floor slab. can be suppressed. In addition, the first precast floor slab and the second precast floor slab are tensioned together, and then the filling material is filled after performing the temporary tightening process. The rigidity of the joint portion of the two precast floor slabs can be further increased. Therefore, it is possible to improve the quality of the floor slab.

According to the present invention, the work of joining precast floor slabs can be efficiently performed, and the rigidity of the joint portion can be increased to improve the quality of the floor slabs.

1 is a perspective view showing an example of a site where half-section floor slab replacement is performed to which the joint structure and joint method according to the embodiment are applied; FIG. It is a longitudinal section showing an example of joint structure concerning an embodiment. FIG. 3 is a perspective view showing an example of a first end surface of a first precast floor slab and a cushioning material of the joint structure according to the embodiment; 4A is a longitudinal sectional view showing an example of the first end face and cushioning material of FIG. 3; FIG. 4B is a vertical cross-sectional view showing an example of the first end face and the cushioning material different from FIG. 4A. FIG. 4 is a flow chart showing an example of each step of a joining method according to an embodiment; (a) and (b) are vertical cross-sectional views showing one exemplary step of the bonding method according to the embodiment. 6(a) and 6(b) are vertical cross-sectional views showing respective steps different from FIGS. 6(a) and 6(b) of the bonding method according to the embodiment. It is a longitudinal cross-sectional view which shows the joining structure which concerns on a modification. It is a perspective view which shows the 1st end surface which concerns on a modification.

Embodiments of the joining structure and joining method according to the present invention will be described below with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted as appropriate. Also, the drawings may be partially simplified or exaggerated for easy understanding, and the dimensional ratios and angles are not limited to those described in the drawings.

FIG. 1 is a perspective view showing an example of a site A to which the joining structure and joining method according to the embodiment are applied. FIG. 2 is a vertical cross-sectional view showing an exemplary joint structure 1 according to the embodiment. As shown in FIGS. 1 and 2, a half-section floor slab replacement method is used at site A where joint structure 1 is provided. In the half-section floor slab replacement method, only one lane L of a plurality of lanes L is regulated and the floor slab of the lane L is replaced.

For example, site A is a site where floor slab replacement work is carried out on road D with four lanes L (two lanes on each side). The main lane L is used as a road D on which automobiles M can travel. In this way, in the half-section floor slab replacement method, lanes L other than one lane L can be used as roads D that can be traveled on. The traffic volume of automobiles M can be secured.

At the site A, the floor slabs F aligned along the width direction D2 (perpendicular to the bridge axis) of the road D, for example, are replaced in the lane L to be constructed. The joint structure 1 includes a first precast floor slab 10 and a second precast floor slab 20 as a plurality of floor slabs F arranged along the width direction D2.

Both the first precast floor slab 10 and the second precast floor slab 20 are precast concrete blocks. As an example, the first precast floor slab 10 and the second precast floor slab 20 may be made of Ultra High reinforced Concrete (UFC).

The first precast floor slab 10 and the second precast floor slab 20 constitute, for example, a road surface part extending in the bridge axis direction D1 and the width direction D2. That is, the upper surface 11 of the first precast floor slab 10 and the upper surface 21 of the second precast floor slab 20 form the road surface of the road D and receive the load of the vehicle M.

The upper surface 11 and the upper surface 21 have a rectangular shape elongated in the width direction D2. The first precast floor slab 10 and the second precast floor slab 20 have a thickness in the height direction D3. The height direction D3 is a direction orthogonal to both the axial direction D1 and the width direction D2, and the axial direction D1 and the width direction D2 are orthogonal to each other. In addition, the shape of the upper surface 11 and the upper surface 21 is not limited to a rectangular shape, and may be, for example, a trapezoidal shape or a fan shape, and can be changed as appropriate.

A joint structure 1 shows a structure in which a first precast floor slab 10 and a second precast floor slab 20 are connected to each other via fillers 40 and cushioning materials 30 . The first precast floor slab 10 and the second precast floor slab 20 may be precast floor slabs forming a bridge of a road bridge including the road D, for example. As an example, an asphalt layer (pavement layer) is provided on the first precast floor slab 10 and the second precast floor slab 20 via a waterproof layer.

For example, the first precast floor slab 10 and the second precast floor slab 20 are prefabricated in a factory, and the prefabricated first precast floor slab 10 and second precast floor slab 20 are transported to the site A. The connection direction in which the first precast floor slab 10 and the second precast floor slab 20 are connected coincides with the width direction D2. The first precast floor slab 10 and the second precast floor slab 20 are placed on beams, for example. The girder material is a steel material extending in the bridge axis direction D1.

FIG. 3 is a perspective view showing the first precast floor slab 10. FIG. As shown in FIGS. 2 and 3, the first precast floor slab 10 has a rectangular parallelepiped shape. A plurality of reinforcing bars extending in the bridge axis direction D1 and a plurality of reinforcing bars extending in the width direction D2 are embedded in the first precast floor slab 10 . Like the first precast floor slab 10, the second precast floor slab 20 also has a rectangular parallelepiped shape, and is embedded with a plurality of reinforcing bars extending in the bridge axis direction D1 and a plurality of reinforcing bars extending in the width direction D2. The shape of the first precast floor slab 10 and the second precast floor slab 20 is not limited to a rectangular parallelepiped shape, and may be, for example, a trapezoid in plan view, a fan shape in plan view, or the like, and can be changed as appropriate.

The first precast floor slab 10 has a first end surface 12 that faces the width direction D2 and faces the second precast floor slab 20 . The second precast floor slab 20 has a second end face 22 that faces the width direction D2 and faces the first precast floor slab 10 . The joint structure 1 is formed by connecting the first end surface 12 located at one end of the first precast floor slab 10 in the width direction D2 and the second end surface 22 located at one end of the second precast floor slab 20 in the width direction D2 to each other. is constructed. The first end surface 12 and the second end surface 22 face each other along the width direction D2. The first end surface 12 and the second end surface 22 may be roughened, for example.

The first end face 12 has a recess 13 recessed in the width direction D2. As a specific example, the first end surface 12 includes a first flat surface 14 provided on one end side (upper side) in the height direction D3 and a second flat surface 15 provided on the other end side (lower side) in the height direction D3. and a recess 13 provided between the first flat surface 14 and the second flat surface 15 .

Both the first flat surface 14 and the second flat surface 15 have a rectangular shape extending in both the bridge axis direction D1 and the height direction D3. The first flat surface 14 and the second flat surface 15 are arranged, for example, so as to be symmetrical with respect to the center of the first precast floor slab 10 in the height direction D3.

The concave portion 13 is, for example, recessed in a trapezoidal shape in the width direction D2 with respect to each of the first flat surface 14 and the second flat surface 15 . The concave portion 13 is formed between a pair of upper and lower inclined surfaces 13b extending obliquely inward in the width direction D2 of the first precast floor slab 10 from each of the first flat surface 14 and the second flat surface 15, and between the pair of inclined surfaces 13b. and a positioned bottom surface 13c.

The bottom surface 13c is, for example, a flat surface extending in both the bridge axis direction D1 and the height direction D3. The pair of inclined surfaces 13b are arranged, for example, so as to be symmetrical with respect to the center of the bottom surface 13c in the height direction D3. In addition, the shape of the concave portion 13 is not limited to the above example and can be changed as appropriate.

The second end surface 22 has a convex portion 23 that protrudes in the width direction D2. The second end surface 22 includes a third flat surface 24 provided on one end side in the height direction D3, a fourth flat surface 25 provided on the other end side in the height direction D3, the third flat surface 24 and the fourth flat surface 24 . and a convex portion 23 provided between the surfaces 25 . The third flat surface 24 and the fourth flat surface 25 respectively face the first flat surface 14 and the second flat surface 15 of the first precast floor slab 10 in the width direction D2. For example, the shape and size of the third flat surface 24 and the fourth flat surface 25 are the same as the shape and size of the first flat surface 14 and the second flat surface 15 .

The convex portion 23 is a portion that fits into the concave portion 13 of the first precast floor slab 10 . The convex portion 23 protrudes in a trapezoidal shape in the width direction D2 from each of the third flat surface 24 and the fourth flat surface 25 . The convex portion 23 includes a pair of upper and lower inclined surfaces 23b extending obliquely outward in the width direction D2 of the second precast floor slab 20 from each of the third flat surface 24 and the fourth flat surface 25, and between the pair of inclined surfaces 23b. and a top surface 23c extending in the bridge axis direction D1 and the height direction D3. Each inclined surface 23b and top surface 23c are opposed to each inclined surface 13b and bottom surface 13c of the first precast floor slab 10, respectively.

In the above example, the first precast floor slab 10 has the concave portion 13 and the second precast floor slab 20 has the convex portion 23 . However, the first precast floor slab 10 may have the convex portion and the second precast floor slab 20 may have the concave portion. That is, in the first precast floor slab and the second precast floor slab, the arrangement of the concave portions and the convex portions may be reversed.

The first end surface 12 is provided with a filler 40 and a cushioning material 30 . The buffer material 30 is interposed between the first end surface 12 and the second end surface 22, and the filler material 40 is filled in the portion between the first end surface 12 and the second end surface 22 where the buffer material 30 is not provided. The filler 40 fills the gap formed between the first end surface 12 and the second end surface 22 .

The filling material 40 is made of a material that hardens over time after being filled. The filler 40 is, for example, non-shrink mortar. The filler 40 may be made of a material other than the non-shrinkable mortar, such as the ultra-high strength fiber reinforced concrete described above. However, the material of the filler 40 is preferably a material that does not separate even when vibrated.

The cushioning material 30 is made of a flexible material, such as rubber. For the first end face 12, for example. A plurality of cushioning materials 30 are provided, and each cushioning material 30 is arranged along the recess 13 of the first end surface 12 . The cushioning material 30 may be in the form of a sheet (tape) extending in one direction, and is arranged such that the longitudinal direction of the cushioning material 30 is along the height direction D3. That is, the cushioning material 30 is arranged along the height direction D3.

The multiple cushioning materials 30 are arranged side by side along the bridge axis direction D1, for example, at equal intervals. As an example, the length of the first precast floor slab 10 in the bridge axis direction D1 is 2 m. The distance D1 is, for example, 40 cm or more and 50 cm or less. However, the number and arrangement of the cushioning materials 30 can be changed as appropriate.

A hole 16 is formed in the first end face 12 into which a first PC steel member 51 of a tensioning means 50 for tensioning the first precast floor slab 10 and the second precast floor slab 20 along the width direction D2 is inserted. The hole 16 opens into the recess 13 of the first end face 12, for example. A plurality of holes 16 are formed in the first end face 12. For example, the holes 16 and the cushioning materials 30 are alternately arranged along the bridge axis direction D1. In this case, the distance between the holes 16 in the bridge axis direction D1 is, for example, 40 cm or more and 50 cm or less.

The tensioning means 50 is embedded in each of the first precast floor slab 10 and the second precast floor slab 20, and by pulling both the first precast floor slab 10 and the second precast floor slab 20 in the width direction D2, the first precast floor slab 10 and the second precast floor slab 20 are tensioned. The precast floor slab 10 and the second precast floor slab 20 are tightened. The tensioning means 50 includes the first PC steel material 51 described above, the second PC steel material 52 embedded in the second precast floor slab 20 in a state of being inserted into the hole 26 of the second precast floor slab 20, the first PC steel material 51 and and a coupler 53 that connects the second PC steel members 52 to each other.

The coupler 53 is embedded in the second precast floor slab 20, for example. A hole 27 into which the first PC steel material 51 extending from the first precast floor slab 10 is inserted is formed on the second end surface 22 side of the coupler 53 . The hole 27 opens into the protrusion 23 of the second end surface 22, for example. However, the coupler 53 may be embedded in the first precast floor slab 10, and the arrangement position of the coupler 53 is not particularly limited.

For example, as shown in FIGS. 3 and 4(a), the cushioning material 30 is arranged to cover the recess 13 of the first end surface 12 along the height direction D3. As an example, the cushioning material 30 is attached to the bottom surface covering portion 31 attached to the bottom surface 13c of the recess 13, the first inclined surface covering portion 32 attached to one inclined surface 13b, and the other inclined surface 13b. It has a second inclined surface covering portion 33, a first corner covering portion 34 covering a corner portion 17 of one inclined surface 13b, and a second corner covering portion 35 covering a corner portion 18 of the other inclined surface 13b.

Each of the bottom surface covering portion 31, the first inclined surface covering portion 32, and the second inclined surface covering portion 33 extends along each of the bottom surface 13c, one inclined surface 13b, and the other inclined surface 13b. The first corner covering portion 34 covers, for example, the corner portion 17 located between the upper end portion of the one inclined surface 13b and the first flat surface 14 . The second corner covering portion 35 covers, for example, the corner portion 18 positioned between the lower end portion of the other inclined surface 13 b and the second flat surface 15 .

It should be noted that the shape, size, number, material and arrangement position of the cushioning material 30 are not limited to the examples described above and can be changed as appropriate. For example, as shown in FIG. 4B, the cushioning material 30A may include only the first corner covering portion 34 or the second corner covering portion 35 only. In this case, the corners 17 and 18 can be protected with the minimum amount of cushioning material 30A. However, when the cushioning material 30 described above is provided, the number of parts can be reduced compared to the cushioning material 30A.

Next, an example of a method for joining precast floor slabs according to this embodiment will be described with reference to the flow chart of FIG. 5 and FIGS. In the following example, the first precast floor slab 10 is an existing floor slab, the second precast floor slab 20 is a newly installed floor slab, and the second precast floor slab 20 is joined to the first precast floor slab 10. An example will be described. The first precast floor slab 10, which is an existing floor slab, is vibrated by the running of the automobile M, etc., because it is connected to the road D described above, for example.

First, as shown in FIG. 6A, the first precast floor slab 10 and the second precast floor slab 20 are arranged so that the first end face 12 and the second end face 22 face each other along the width direction D2. are arranged along the width direction D2. Then, the first precast floor slab 10 and the second precast floor slab 20 are aligned in the height direction D3.

Also, a cushioning material 30 is installed in the concave portion 13 of the first end face 12 of the first precast floor slab 10 (step S1). The cushioning material 30 may be installed in advance before joining the first precast floor slab 10 and the second precast floor slab 20 together. In step S<b>1 , for example, each of the multiple cushioning materials 30 is attached so as to cover the recess 13 and the corners 17 and 18 .

As shown in FIG. 6(b), the first precast steel material 51 is inserted into the hole 16 of the first precast floor slab 10, the second precast steel material 52 is inserted into the hole 26 of the second precast floor slab 20, and the coupler 53 The first PC steel material 51 and the second PC steel material 52 are connected to each other via the (step S2).

With the tensioning means 50 arranged as described above, the first PC steel material 51 and the second PC steel material 52 of the tensioning means 50 are pulled in the width direction D2 for temporary tightening (step S3). At this time, for example, the rubber-like cushioning material 30 is crushed and expanded between the first end surface 12 and the second end surface 22, and the second precast floor slab 20 and the cushioning material 30 together with the first precast floor slab 10 (the automobile M (due to running etc.).

After the temporary tightening, as shown in FIG. 2, the gap formed between the first end surface 12 and the second end surface 22 is filled with the filler 40 (step S4). The filler 40 is filled, for example, in a state in which the lower side of the gap and the end portion side in the bridge axis direction D1 are closed with a tape member. After the filled filler 40 hardens and closes the space between the first end surface 12 and the second end surface 22, the first PC steel material 51 and the second PC steel material 52 of the tensioning means 50 are pulled in the width direction D2 to tighten the main body. Tightening is performed (step S5). After the first precast floor slab 10 and the second precast floor slab 20 are integrated by this final tightening, a series of steps is completed.

Next, the effects of the joint structure 1 and the joint method according to this embodiment will be described. In the joining structure 1 and the joining method according to this embodiment, the first end surface 12 of the first precast floor slab 10 and the second end surface 22 of the second precast floor slab 20 face each other along the width direction D2. The first end face 12 has a recess 13 recessed in the width direction D2, and the second end face 22 has a protrusion 23 protruding in the width direction D2.

Accordingly, since the projections 23 are fitted into the recesses 13 and the first precast floor slab 10 and the second precast floor slab 20 are joined to each other, the rigidity of the joint portion is reduced compared to the case where the end faces are flat surfaces. can be enhanced. That is, since the end faces are formed into the concave portions 13 and the convex portions 23, the tensile strength and shear strength of the first precast floor slab 10 and the second precast floor slab 20 can be increased.

In the joint structure 1 , the convex portion 23 fits into the concave portion 13 and the cushioning material 30 is arranged along the concave portion 13 . Therefore, when the second end surface 22 of the second precast floor slab 20 is joined to the first end surface 12 of the first precast floor slab 10, even if the first precast floor slab 10 vibrates due to the running of the automobile M or the like, By interposing the cushioning material 30 between the first end face 12 and the second end face 22, the second end face 22 can be joined to the first end face 12 efficiently.

When the second end face 22 of the second precast floor slab 20 is joined to the first end face 12 of the first precast floor 10 , the second end face 22 is connected to the first end face 12 via the cushioning material 30 arranged in the recess 13 . is spliced to Therefore, even when the first precast floor slab 10 is vibrating, the shock absorbing material 30 can prevent the second precast floor slab 20 from colliding with the recess 13 . As a result, the cushioning material 30 can prevent the first precast floor slab 10 or the second precast floor slab 20 from chipping or cracking, so that the quality of the floor slab F can be improved.

Moreover, the cushioning material 30 may be arranged so as to cover the corners 17 and 18 of the recess 13 . In this case, the corners 17 and 18 can be protected by the cushioning material 30 by suppressing a direct collision with the corners 17 and 18 of the concave portion 13 . Therefore, it contributes to improving the quality of the floor slab F.

The tension means 50 are embedded in the first precast steel material 51 embedded in the first precast floor slab 10, the second precast steel material 52 embedded in the second precast floor slab 20, and the second precast floor slab 20. , and a coupler 53 that connects the first PC steel material 51 and the second PC steel material 52 to each other. A first PC steel material 51 is embedded in the first precast floor slab 10, a second PC steel material 52 is embedded in the second precast floor slab 20, and the first PC steel material 51 and the second PC steel material 52 are connected to each other by a coupler 53. can be done.

By connecting the first PC steel members 51 of the first precast floor slab 10 and the second PC steel members 52 of the second precast floor slab 20 to each other by the couplers 53, the number of PC steel members in each floor slab can be made appropriate. This contributes to reducing the cost of the tensioning means 50 and the like.

In the joining method according to the present embodiment, the first precast floor slab 10 and the second precast floor slab 20 are both tensioned in the temporary tightening process, then filled with the filler 40, and after the filler 40 hardens, the final tightening process is performed. By doing so, the rigidity of the joint portion between the first precast floor slab 10 and the second precast floor slab 20 can be further increased. Therefore, the quality of the floor slab F can be improved.

Although the embodiments of the joining structure and joining method according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified without changing the gist of each claim. good too. That is, the shape, size, material, number and arrangement of each part of the joint structure, and the content and order of each step of the joining method can be changed as appropriate without departing from the scope of the above.

For example, as shown in FIGS. 7(a) and 7(b), instead of the filler 40, a filler 60 made of resin can be used. The filler 60 is, for example, epoxy resin. When the filler 60 is used, for example, the filler 60 is applied to the second end surface 22 in advance before the second precast floor slab 20 is brought into close contact with the cushioning material 30 .

After the filler 60 is applied to the second end face 22 and the second precast floor slab 20 is adhered to the cushioning material 30, the first precast floor slab 10 and the second precast floor slab 20 are tensioned by the tensioning means 50. Even when the filler 60 is used in this manner, the joint structure 1 can have a high strength at the joint portion.

Further, in the above-described embodiment, an example in which the first precast floor slab 10 having the concave portion 13 and the second precast floor slab 20 having the convex portion 23 are provided, and the cushioning material 30 is arranged in the concave portion 13 has been described. However, as shown in FIG. 8, a first precast floor slab 70 having a convex portion 73 and a second precast floor slab 80 having a concave portion 83 may be provided, and the cushioning material 30 may be arranged in the convex portion 73. may be In this way, the relationship between the unevenness of the first precast floor slab and the second precast floor slab and the arrangement position of the cushioning material can be changed as appropriate.

Further, in the above-described embodiment, the first precast floor slab 10 provided with the concave portion 13 having the inclined surface 13b and the bottom surface 13c, and the second precast floor slab provided with the convex portion 23 having the inclined surface 23b and the top surface 23c. 20, was explained. However, as shown in FIG. 9, the first precast floor slab 90 has an upper surface 91 and a first end surface 92, and the first precast floor slab 90 includes a convex portion 93 that protrudes in a rectangular shape from the first end surface 92 in the width direction D2. It may be one precast floor slab 90 .

When the first precast floor slab 90 is provided, it is possible to generate resistance in the bridge axis direction D1 and the height direction D3 at the time of joining, so that a strong joint structure can be obtained. In this way, the shape, size, number and arrangement of the projections and recesses of the first precast floor slab and the second precast floor slab can be changed as appropriate.

Further, in the above-described embodiment, the joint structure 1 and the joint method applied to the site A where the half-section floor slab replacement method is used on the road D having a plurality of lanes L have been described. However, the joining structure and joining method according to the present invention can also be applied to sites where construction methods other than the half-section floor slab replacement method are used, and the types of applicable sites are not particularly limited.

Reference Signs List 1 Joint structure 10, 70, 90 First precast floor slab 11, 91 Upper surface 12, 92 First end surface 13, 83 Recessed surface 13b Inclined surface 13c Bottom surface 14 First first flat surface 15 second flat surface 16 hole 17, 18 corner 20, 80 second precast floor slab 21 upper surface 22 second end surface 23, 73, 93 convex portion, 23b... Inclined surface 23c... Top surface 24... Third flat surface 25... Fourth flat surface 26, 27... Holes 30, 30A... Cushioning material 31... Bottom surface covering portion 32... First inclined surface covering Part 33... Second inclined surface covering part 34... First corner covering part 35... Second corner covering part 40, 60... Filler material 50... Tensioning means 51... First PC steel material 52... Second PC steel material , 53... coupler, A... site, D... road, D1... bridge axis direction, D2... width direction, D3... height direction, F... floor slab, L... lane, M... car.

Claims (4)

A joint structure comprising a first precast floor slab and a second precast floor slab that are divided in the width direction of a road and joined together along the width direction,
The first precast floor slab has a first end face facing the second precast floor slab along the width direction,
The second precast floor slab has a second end face facing the first precast floor slab along the width direction,
one of a convex portion projecting in the width direction and a concave portion recessed in the width direction is formed on the first end face;
The second end face is formed with the other of a protrusion projecting in the width direction and a recess recessed in the width direction,
The convex portion fits into the concave portion,
a cushioning material arranged along either the convex portion or the concave portion;
a tensioning means embedded in the first precast floor slab and the second precast floor slab and tensioning the first precast floor slab and the second precast floor slab together along the width direction;
a filler filled between the first end surface and the second end surface;
with
The recess has a pair of upper and lower inclined surfaces and a bottom surface located between the pair of inclined surfaces,
The cushioning material has a tape shape extending in one direction,
The cushioning material has a first corner covering portion covering a corner portion of one of the inclined surfaces and a second corner covering portion covering a corner portion of the other inclined surface.
junction structure. The cushioning material is arranged so as to cover one of the corners of the convex portion and the concave portion.
The joining structure according to claim 1. The tensioning means are
a first PC steel material embedded in the first precast floor slab;
a second PC steel material embedded in the second precast floor slab;
a coupler that is embedded in either the first precast floor slab or the second precast floor slab and connects the first PC steel material and the second PC steel material to each other;
3. The joint structure according to claim 1 or 2. A joining method comprising a first precast floor slab and a second precast floor slab that are divided in the width direction of a road and joined together along the width direction,
a step of disposing a cushioning material in either a recess formed on the first end surface of the first precast floor slab or a protrusion formed on the second end surface of the second precast floor slab;
a temporary tightening step of tensioning both the first precast floor slab and the second precast floor slab along the width direction by tensioning means in a state in which the cushioning material is sandwiched between the recess and the projection;
filling a filler between the first end surface and the second end surface;
a final tightening step of tensioning both the first precast floor slab and the second precast floor slab along the width direction by the tensioning means after the filler has hardened;
with
The recess has a pair of upper and lower inclined surfaces and a bottom surface located between the pair of inclined surfaces,
The cushioning material has a tape shape extending in one direction,
The cushioning material has a first corner covering portion that covers a corner portion of one of the inclined surfaces, and a second corner covering portion that covers a corner portion of the other inclined surface.
Joining method.

Images