JP6387323B2 - Precast slab connection structure, precast slab system, and bridge structure - Google Patents

Description

  The present invention relates to a precast slab connection structure, a precast slab system, and a bridge structure.

  Conventionally, in order to shorten the time required for the construction of a bridge structure such as a road bridge, it has been studied to configure a floor slab constituting the bridge structure using a plurality of precast floor slabs.

For example, in the pedestrian bridge of Non-Patent Document 1, recesses are respectively formed on opposite side surfaces of a pair of precast slabs. One pipe which is a shear key is engaged with the recess of each precast slab. Fill the pipe with mortar. A space between each recess and the pipe is filled with MMA (Methyl Methacrylate) resin. That is, a pair of precast slabs are connected by a pipe and MMA resin.
The precast floor slab is manufactured in advance at a factory or a place such as a manufacturing yard including a construction site before the installation of the floor slab. For this reason, a precast slab can be manufactured irrespective of the weather etc., and the period required for construction of a pedestrian bridge can be shortened.

Kawada Kogyo Co., Ltd., Toyama Engineering Department, “Design of footbridge using precast floor slab”, [online], January 1990, Kawada Technical Report Vol. 9, [Search March 9, 2015], Internet <URL: http://www.kawada.co.jp/technology/gihou/vol_09.html>

  However, in the pedestrian bridge of Non-Patent Document 1, it is necessary to place a pipe between a pair of precast floor slabs and to fill MMA resin between the recesses of the precast floor slab and the pipes. For this reason, there is a problem that it takes time to connect the pair of precast slabs.

  The present invention has been made in view of such problems, and a precast floor slab connection structure capable of easily connecting the precast floor slabs, a precast floor slab system comprising the precast floor slab connection structure, and An object is to provide a bridge structure equipped with this precast slab system.

In order to solve the above problems, the present invention proposes the following means.
The connection structure of the precast floor slab of the present invention is formed in a plate shape, and the connection of the precast floor slab that connects the first precast floor slab and the second precast floor slab arranged in the alignment direction intersecting the thickness direction. It is a structure, is formed so as to protrude from the side surface of the first precast slab, and moves toward one side of the thickness direction as it goes to one side of the intersecting direction that intersects the thickness direction and the alignment direction, respectively. A first convex portion having a first inclined surface inclined so as to face, and formed so as to protrude from a side surface of the second precast slab, and is inclined along the first inclined surface and on the first inclined surface A second convex portion having a second inclined surface that is in contact with the first convex portion and the second convex portion, the movement in the direction along the first inclined surface is the first inclined surface and the second convex portion. Acts between two inclined surfaces Static friction, or is characterized by being regulated by fixing force acting on said first inclined surface and the second inclined surface.

  According to this invention, when a load acts in the thickness direction from the second convex portion toward the first convex portion, the second convex portion will move along the first inclined surface with respect to the first convex portion. And Since the movement of the first convex portion and the second convex portion in the direction along the first inclined surface is restricted by the static frictional force or the adhering force, the second convex portion is in the thickness direction and the first convex portion. The state in which the first precast slab and the second precast slab are integrated is maintained without moving in the intersecting direction.

In the connection structure of the precast slab, the movement of the first convex portion and the second convex portion in the direction along the first inclined surface is performed between the first inclined surface and the second inclined surface. When the angle between the main surface of the first precast slab and the first inclined surface is θ (rad) in a cross section that is regulated by the static friction force acting between and orthogonal to the arrangement direction, The static friction coefficient between the first inclined surface and the second inclined surface may be equal to or greater than the value of tan θ.
According to the present invention, the static friction force acting between the first inclined surface and the second inclined surface moves the second convex portion along the first inclined surface with respect to the first convex portion by the applied load. It becomes more than the power to try.

  Further, in the connection structure of the precast floor slab, provided between the side surface of the first precast floor slab and the side surface of the second precast floor slab, and fixed to the first inclined surface and the second inclined surface, respectively. The fixing force acting between the first inclined surface and the filler, the movement of the first convex portion and the second convex portion in the direction along the first inclined surface, And it may be regulated by the adhering force acting between the second inclined surface and the filler.

In the connection structure of the precast slab, at least a part of the intersection line between the first inclined surface and the main surface of the first precast slab may be curved.
According to the present invention, at least a part of the intersection line of the first convex portion is curved, so that the corner portion of the first convex portion is reduced.
A precast floor slab system according to the present invention includes the precast floor slab connection structure described above, the first precast floor slab, and the second precast floor slab.

  Moreover, the bridge structure of the present invention has a support surface attached to the main surface of the precast slab system described above, the main surface of the first precast slab and the main surface of the second precast slab, and extends in the alignment direction. And a plurality of bridge girders that are arranged side by side in the intersecting direction and support the first precast slab and the second precast slab from below, and in the intersecting direction, adjacent to the intersecting direction. Between the support surfaces of the bridge girders, at least a part of the first inclined surface and the second inclined surface is respectively disposed, orthogonal to the arrangement direction, and the second convexity of the second precast slab. In the cross section at a position where the bridge girder supports the second inclined surface, the second inclined surface moves in the thickness direction from the second main surface of the second precast slab to the main surface side. Inclined toward the one side direction, and the other end of the cross direction of the second inclined surface is characterized by being disposed on the supporting surface of the bridge girder.

According to this invention, at least a part of the first inclined surface and the second inclined surface is disposed between the support surfaces of the bridge beams adjacent in the intersecting direction. For this reason, between the support surfaces of the bridge beams adjacent in the crossing direction, the upper one of the first inclined surface and the second inclined surface is supported from the lower one.
In the cross-section at the position orthogonal to the alignment direction and where the bridge beam supports the second convex portion of the second precast slab, the first in one direction in the cross direction is more than one side in the cross direction of the support surface in the alignment direction. A load is applied to the convex portion downward along the thickness direction. This load is supported below the first convex portion and the second convex portion supported by the bridge girder via the first inclined surface and the second inclined surface.

Further, in the above bridge structure, the bridge girder that is orthogonal to the arrangement direction and is arranged at the other end of the crossing direction among the plurality of bridge girders supports the second convex portion of the second precast slab. In addition, in the cross section at the position where the first convex portion is disposed on the other side in the intersecting direction from the second convex portion, the second inclined surface is from the second main surface of the second precast slab. As it moves to the main surface side in the thickness direction, it inclines toward the other side of the intersecting direction, and one end of the second inclined surface in the intersecting direction is the support surface of the bridge girder It may be arranged on top.
According to the present invention, a load is applied downward along the thickness direction to the first convex portion disposed on the other side in the crossing direction than the second convex portion supported by the bridge girder. This load is supported below the first convex portion and the second convex portion supported by the bridge girder via the first inclined surface and the second inclined surface.

In the present invention, according to the connection structure of the precast floor slab described in claim 1, the first convex portion and the second convex portion are used without using a plurality of members such as pipes and MMA resin as in Non-Patent Document 1. By connecting, the precast slabs can be connected easily.
According to the precast slab connection structure according to claim 2, the first convex portion and the second convex portion are connected to the first convex portion without providing another member between the first convex portion and the second convex portion. It can connect by the static frictional force which acts between an inclined surface and a 2nd inclined surface.

According to the connection structure of the precast floor slab according to claim 3, it is possible to prevent the first convex portion and the second convex portion from rattling in a direction orthogonal to the first inclined surface.
According to the connection structure of the precast floor slab according to claim 4, the first convex portion is less likely to be damaged by an external force.
According to the precast floor slab system of the fifth aspect, both the precast floor slabs can be easily connected using the connection structure of the precast floor slabs.

According to the bridge structure according to claim 6, a step is formed in the thickness direction between the support surfaces of the bridge girders adjacent to each other in the intersecting direction between the one precast floor slab and the convex portion of the other precast floor slab. Can be suppressed.
According to the bridge structure according to claim 7, the first protrusion disposed on the other side in the crossing direction than the second protrusion supported by the bridge girder disposed on the other end in the crossing direction among the plurality of bridge girders. It is possible to suppress the formation of a step in the thickness direction between the portion and the second precast slab.

It is a perspective view of the precast floor slab system of a 1st embodiment of the present invention. It is a perspective view of the 1st precast floor slab of the precast floor slab system. It is sectional drawing which shows the state which the wheel load acted on the 1st convex part of the same precast slab system. It is the perspective view which decomposed | disassembled both the precast floor slabs of the same precast floor slab system. It is sectional drawing which shows the state which the wheel load acted on the 2nd convex part of the same precast slab system. It is a perspective view of the 1st precast floor slab in the modification of 1st Embodiment of this invention. It is the perspective view which decomposed | disassembled the precast floor slab system in the modification of 1st Embodiment of this invention. It is sectional drawing of the principal part of the precast floor slab system in the modification of 1st Embodiment of this invention. It is a figure which shows the analysis result of the level | step difference of the precast slab adjacent to the arrangement direction. It is a figure which shows the analysis result of the opening of the precast floor slab adjacent to the arrangement direction. It is sectional drawing of the bridge structure of 2nd Embodiment of this invention. It is a principal part enlarged view in FIG. It is a principal part enlarged view in FIG. It is a principal part enlarged view in FIG. It is sectional drawing of the bridge structure in the modification of 2nd Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of a precast floor slab system (hereinafter also abbreviated as a floor slab system) according to the present invention will be described with reference to FIGS. 1 to 10.
As shown in FIGS. 1 to 3, the present floor slab system 1 includes a first precast floor slab 10, a plurality of first convex portions 15 formed so as to protrude from the side surface 10 a of the first precast floor slab 10, The second precast floor slab 20 and a plurality of second convex portions 25 formed so as to protrude from the side surface 20a of the second precast floor slab 20 are provided.
The plurality of first protrusions 15 and the plurality of second protrusions 25 constitute a precast floor slab connection structure (hereinafter also referred to as a connection structure) 2 of the present embodiment. The side surface 10 a of the first precast floor slab 10 and the side surface 20 a of the second precast floor slab 20 are surfaces parallel to the thickness direction Z of the first precast floor slab 10.
FIG. 3 is a cross-sectional view taken along a plane orthogonal to the arrangement direction X to be described later.

The first precast floor slab 10 is formed in a plate shape that is rectangular when viewed in parallel to the thickness direction Z of the first precast floor slab 10.
In this embodiment, the 1st convex part 15 is formed in the parallelogram shape when it sees in parallel with the arrangement direction X by which the 1st precast floor slab 10 and the 2nd precast floor slab 20 are arranged side by side. (See FIG. 3). This arrangement direction X is a direction orthogonal (crossing) to the thickness direction Z.
The outer surfaces 15a and 15b of the first convex portion 15 are flush with the first main surface (main surface) 10b and the second main surface 10c of the first precast floor slab 10, respectively. These outer surfaces 15a and 15b are flat surfaces orthogonal to the thickness direction Z. The thickness of the first convex portion 15 (the length in the thickness direction Z) is equal to the thickness of the first precast floor slab 10.

As shown in FIG. 3, the first inclined surfaces 15 c and 15 d that are the outer surfaces of the first convex portion 15 are directed toward one side Z <b> 1 in the thickness direction Z toward the one side Y <b> 1 in the orthogonal direction (cross direction) Y. So as to be inclined. The orthogonal direction Y is a direction orthogonal (crossing) to the arrangement direction X and the thickness direction Z, respectively. These first inclined surfaces 15 c and 15 d are flat surfaces parallel to the alignment direction X. As shown in FIG. 2, an intersection line L1 between the first inclined surface 15c and a surface obtained by extending the first main surface 10b of the first precast floor slab 10 is linear.
As shown in FIG. 3, an angle formed between the first main surface 10b of the first precast floor slab 10 and the first inclined surfaces 15c and 15d is θ (rad: radians). However, it is assumed that the angle θ is an acute angle, that is, greater than 0 and less than π / 2. In this example, for example, the angle θ is 0.436 rad (25 °).

In the present embodiment, a part of the first convex portion 15 adjacent in the orthogonal direction Y overlaps in the thickness direction Z.
The first precast floor slab 10 and the plurality of first convex portions 15 are integrally formed of RC (Reinforced Concrete) or PC (Pressed Concrete).

The second precast floor slab 20 and the second convex portion 25 are configured in the same manner as the first precast floor slab 10 and the first convex portion 15.
That is, the second precast floor slab 20 is formed in a plate shape that is rectangular when viewed in parallel to the thickness direction Z. The second convex portion 25 is formed in a parallelogram shape when viewed in parallel with the arrangement direction X. The side surface 20 a of the second precast floor slab 20 is a surface facing the side surface 10 a of the first precast floor slab 10.
As shown in FIG. 3, the outer surfaces 25a and 25b of the second convex portion 25 are flush with the first main surface (main surface) 20b and the second main surface 20c of the second precast floor slab 20, respectively. These outer surfaces 25a and 25b are flat surfaces orthogonal to the thickness direction Z. The thickness of the second convex portion 25 is equal to the thickness of the second precast floor slab 20. The thickness of the second precast floor slab 20 is equal to the thickness of the first precast floor slab 10.

The second inclined surfaces 25c and 25d that are the outer surfaces of the second convex portion 25 are inclined along the first inclined surfaces 15c and 15d, respectively. More specifically, the second inclined surfaces 25c and 25d are inclined so as to be directed to one side Z1 in the thickness direction Z toward the one side Y1 in the orthogonal direction Y. These second inclined surfaces 25c and 25d are flat surfaces parallel to the alignment direction X.
The angle formed by the first main surface 20b of the second precast slab 20 and the second inclined surfaces 25c and 25d is the aforementioned angle θ.

The distance in the orthogonal direction Y between the second convex portions 25 adjacent to the orthogonal direction Y is slightly longer than the length of the first convex portion 15 in the orthogonal direction Y. When the plurality of second protrusions 25 are engaged with the plurality of first protrusions 15 to connect the first precast floor slab 10 and the second precast floor slab 20, the second inclined surface of the second protrusion 25 25c and 25d are in contact with the first inclined surfaces 15d and 15c, respectively. The static friction coefficient μ between the first inclined surface 15c and the second inclined surface 25d is equal to or greater than the value of tan θ.
For example, when the angle θ is 0.436 rad, the value of tan θ is 0.47. In this example in which the first convex portion 15 and the second convex portion 25 are each formed of concrete, for example, the static friction coefficient μ is 0.6.
Similarly, the static friction coefficient between the first inclined surface 15d and the second inclined surface 25c is equal to the above-described static friction coefficient μ and is equal to or greater than the value of tan θ.

In the present embodiment, a part of the second convex portion 25 adjacent in the orthogonal direction Y overlaps in the thickness direction Z.
The second precast floor slab 20 and the plurality of second convex portions 25 are integrally formed of the same material as the first precast floor slab 10.
The floor slab system 1 configured in this manner moves the second precast floor slab 20 in a direction T along the first inclined surface 15c with respect to the first precast floor slab 10, for example, as shown in FIG. The first precast floor slab 10 and the second precast floor slab 20 are connected by engaging the plurality of first protrusions 15 and the plurality of second protrusions 25. The plurality of first protrusions 15 and the plurality of second protrusions 25 serve as comb-shaped shear keys of the floor slab system 1.
At this time, a frictional force acts between the first inclined surface 15c and the second inclined surface 25d, and the first convex portion 15 and the second convex portion 25 are engaged against this frictional force.

The floor slab system 1 configured as described above is used for a road bridge such as a highway as described later. At this time, as shown in FIG. 3, the floor slab system 1 is attached to the road bridge so that the bridge axial direction U of the road bridge and the alignment direction X of the floor slab system 1 are parallel to each other. The thickness direction Z is parallel to the vertical direction V, for example. Although not shown, a known waterproof layer and asphalt pavement layer are sequentially laminated on the floor slab system 1.
The automobile C travels along the direction X on the asphalt pavement layer. It is assumed that the tire C1 of the automobile C applies a wheel load (load) P to the floor slab system 1 downward through the asphalt pavement layer. In this example, the case where the wheel load P acts on the outer surface 15b of the first convex portion 15 will be described.
Wheel load P has a displacement force P _h is a component of the direction T is a direction along the first inclined surface 15c, is decomposed into Bearing force P _v is a component force in the direction perpendicular to the direction T. The size of the displacement force P _h and Bearing force P _v is defined as (1) and (2) below.
P _h = Psin θ (1)
P _v = P cos θ (2)

The static frictional force Q acting between the first inclined surface 15c and the second inclined surface 25d is expressed by equation (3).
Q = μP _v = μPcos θ (3)
Now comparing the magnitude of the size and displacement force P _h of static friction force Q, so the equation (4).
Q−P _h = μP cos θ−P sin θ = P cos θ (μ−tan θ)
≒ P × 0.91 × (0.6-0.47) ・ ・ (4)

The wheel load P is a positive value. When the angle θ is an acute angle, the value of cos θ is positive. Since the static friction coefficient μ is equal to or greater than the value of tan θ, the value of the equation (4) becomes 0 or greater. That is, if (Q-P _h) the value of 0 or more, static friction force Q becomes higher displacement force P _h, displacement force P _h between the first inclined surface 15c and the second slanted surface 25d is Even if it acts, the 1st inclined surface 15c and the 2nd inclined surface 25d do not move relatively in the direction T. That is, the movement of the first convex portion 15 and the second convex portion 25 in the direction T is restricted by the static friction force Q, and the first precast floor slab 10 and the second precast floor slab 20 are integrated.
Thus, when the wheel load P is applied, the second convex portion 25 tends to move in the direction T with respect to the first convex portion 15. However, since the movement of the first convex portion 15 and the second convex portion 25 in the direction T is restricted by the static friction force Q, the first precast floor slab 10 and the second precast floor slab 20 move relatively. Without being integrated, the integrated state is maintained.

On the other hand, the case where the wheel load P acts on the outer surface 25b of the second convex portion 25 as shown in FIG. 5 will be described.
As with the wheel load P acts on the first projection 15, wheel load P has a displacement force P _h is a component of the direction T, a component force in the direction perpendicular to the direction T Bearing force P _v And decomposed.
The magnitudes of the displacement force P _h , the support pressure P _v , and the static friction force Q are the same as the equations (1), (2), and (3). In this case, the static frictional force Q acts between the first inclined surface 15d and the second inclined surface 25c.
In this case, the difference between the size of the size and displacement force P _h of static friction force Q is (4) becomes as. The movement of the first convex portion 15 and the second convex portion 25 in the direction T is restricted by the static friction force Q, and the first precast floor slab 10 and the second precast floor slab 20 are integrated.
As described above, the first precast floor slab 10 and the second precast floor slab 20 are integrated even if the wheel load P acts on either the first convex portion 15 or the second convex portion 25 which is the connection structure 2. State is maintained.

As described above, according to the connection structure 2 of the present embodiment, when the wheel load P acts downward along the thickness direction Z, the second convex portion 25 with respect to the first convex portion 15. Tries to move in direction T. Since the movement of the first convex portion 15 and the second convex portion 25 in the direction T is restricted by the static frictional force Q, the second convex portion 25 has a thickness direction Z and a vertical direction with respect to the first convex portion 15. The state in which the first precast floor slab 10 and the second precast floor slab 20 are integrated is maintained without moving to V respectively.
Thus, the precast floor slab 10 can be obtained by connecting the first convex portion 15 and the second convex portion 25 only by the static frictional force Q without using a plurality of members such as pipes and MMA resin as in Non-Patent Document 1. 20 can be easily connected.

  The thickness of the first convex portion 15 and the second convex portion 25 as a whole is equal to the thickness of the precast floor slabs 10 and 20. For this reason, the shear strength of the connection structure 2 is substantially equal to the precast floor slabs 10 and 20 as the main body. Therefore, it is not necessary to add a reinforcing steel material in the precast floor slabs 10 and 20 and the convex portions 15 and 25.

According to the floor slab system 1 of this embodiment, both the precast floor slabs 10 and 20 can be easily connected using the connection structure 2.
Since the static friction coefficient μ between the first inclined surface 15c and the second inclined surface 25d is equal to or greater than the value of tan θ, the first convex portion 15 and the second convex portion 25 are not provided with other members, and the first The one convex portion 15 and the second convex portion 25 can be connected by a static friction force acting between the first inclined surface 15c and the second inclined surface 25d.

Note that the connection structure 2 and the floor slab system 1 of the present embodiment can be modified in various ways as described below.
For example, as shown in FIG. 6, the first inclined surfaces 30c and 30d of the first convex portion 30 may be curved surfaces. In this modification, the intersection line L2 between the first inclined surface 30c and the surface obtained by extending the first main surface 10b of the first precast floor slab 10 is linear. Thus, the first inclined surfaces 30c and 30d are not flat and may be curved with a predetermined radius of curvature.
Although not shown, the second convex portion is formed in the same manner as the first convex portion 30.
In this case, in order to connect the first precast floor slab 10 and the second precast floor slab 20, the first precast floor slab 10 and the second precast floor slab 20 are moved in the alignment direction X.

As in the floor slab system 1 </ b> A shown in FIG. 7, the first convex portion 35 and the second convex portion 40 may be provided instead of the first convex portion 15 and the second convex portion 25 of the present embodiment.
The first inclined surfaces 35c and 35d of the first convex portion 35 are curved surfaces, and the first inclined surface 35c and the first inclined surface 35d are smoothly connected.
Intersection lines L4 and L5 between the first inclined surfaces 35c and 35d of the first convex portion 35 and a surface obtained by extending the first main surface 10b of the first precast floor slab 10 are curved. The intersection lines L4 and L5 are like a sine wave as a whole, and all portions are curved.
The second convex portion 40 is formed to engage with the first convex portion 35 in the same manner as the first convex portion 35.

According to the floor slab system 1A of the modified example configured as described above, the intersection lines L4 and L5 of the first convex portion 35 are curved, so that the corner portions of the first convex portion 35 are reduced. Therefore, the first convex portion 35 is less likely to be damaged by an external force.
In this modification, all the intersection lines L4 and L5 are curved, but some of the intersection lines L4 and L5 may be linear. Specifically, the central portion in the longitudinal direction of the intersection line L1 shown in FIG. 2 may be linear, and both end portions may be curved so as to eliminate corners.

As in the floor slab system 1B shown in FIG. 8, in the floor slab system 1 of the present embodiment, a filler is provided in the gap S between the side surface 10a of the first precast floor slab 10 and the side surface 20a of the second precast floor slab 20. 45 may be provided. As the filler 45, acrylic resin mortar, epoxy resin, or the like can be used. The filler 45 is fixed to the first inclined surfaces 15c and 15d and the second inclined surfaces 25c and 25d, respectively. In other words, the first convex portion 15 is caused by the fixing force acting between the first inclined surfaces 15c, 15d and the filler 45 and the fixing force acting between the second inclined surfaces 25c, 25d and the filler 45. And the movement of the second convex portion 25 in the direction T are restricted.
The adhering force of the filler 45 is added to the filler 45 so that the first convex portion 15 and the second convex portion 25 do not move in the direction T even if the wheel load P acts on the convex portions 15 and 25. The grade of the object and the filler 45 is selected and adjusted.
Even if the floor slab system 1B is configured in this way, the same effects as those of the floor slab system 1 of the present embodiment can be obtained.
Furthermore, the 1st convex part 15 and the 2nd convex part 25 are rattled in the direction orthogonal to the 1st inclined surface 15c because the 1st convex part 15 and the 2nd convex part 25 are fixed by the filler 45. Can be suppressed.

Here, the result of having analyzed about the level | step difference and opening of the floor slab system of an Example and a comparative example is demonstrated using FIG.
FIG. 9 shows the analysis results of the steps of the precast slabs of the example and the comparative example. What is indicated by a line L21 is an analysis result in the floor slab system 1B of the embodiment having the filler 45. The connection structure 2 is disposed at positions A1 and A2 on the horizontal axis in the figure, and one precast floor slab 10 is disposed in a range A3 between the positions A1 and A2. The length of the precast floor slab 10 in the arrangement direction X was 2 m. Other precast floor slabs are arranged so as to sandwich the precast floor slab 10 in the alignment direction X.
The wheel load P is applied to the end portion on the position A1 side of the precast slab shown in the drawing.

As a comparative example, the analysis result of a precast floor slab connected by MMA resin or the like with a relatively weak strength as in Non-Patent Document 1 (hereinafter referred to as a discontinuous structure floor slab system) is indicated by a line L22. . As a comparative example, an analysis result of a precast floor slab that is seamlessly continuous in the direction X (corresponding to a continuous structure floor slab system) is indicated by a line L23.
In the discontinuous structure, a large step having a length D6 occurs between precast slabs adjacent in the arrangement direction X. There is no step in the continuous structure.
The step length D7 by the floor slab system 1B of the embodiment is about 0.15 mm.
By providing a connection structure between the precast floor slabs to make the floor slab system 1B of the example, the level difference becomes smaller than that of the floor slab system of the comparative example, and the amount of deformation may be close to that of a continuous structure slab system. I understood.

FIG. 10 shows the analysis results of the mesh openings of the precast slabs of Examples and Comparative Examples.
What is indicated by a line L24 is an analysis result in the floor slab system 1B of the embodiment. As a comparative example, the analysis result of the floor slab system having a discontinuous structure is indicated by a line L25, and the analysis result of the floor slab system having a continuous structure is indicated by a line L26.
It was found that the opening length D8 of the floor slab system 1B is about 0.25 mm, which is about the same as the opening length D9 of the floor slab system having a discontinuous structure. In the continuous structure, no meshing occurs.

  In the present embodiment, a plurality of first convex portions 15 are formed on the first precast floor slab 10, and a plurality of second convex portions 25 are formed on the first convex portion 15. However, the number of convex portions 15 and 25 formed on the precast floor slabs 10 and 20 is not limited, and may be one.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 11 and FIG. 12, but the same parts as those in the above embodiment will be denoted by the same reference numerals, and the description thereof will be omitted. explain.
As shown in FIG. 11, the road bridge (bridge structure) 3 of the present embodiment is for a highway or the like, and is attached to the floor slab system 1 and the precast floor slabs 10 and 20. , 20 are provided with a plurality of bridge girders 50 that support 20 from below.
FIG. 11 is a cross-sectional view taken along a plane orthogonal to the arrangement direction X.

The bridge girder 50 is arranged such that flanges 52 and 53 are positioned above and below the web 51, respectively. For the bridge girder 50, a known I-shaped steel or H-shaped steel can be used.
The plurality of bridge girders 50 are arranged side by side with an interval in the orthogonal direction Y while extending in the arrangement direction X. This arrangement direction X is a direction parallel to the bridge axis direction U of the road bridge 3. The thickness direction Z is parallel to the vertical direction V, for example.
The bridge girder 50 is supported from below by bridge piers 55 (only one is shown in FIG. 11) arranged at intervals in the arrangement direction X.

A support surface 52 a that is an upper surface of the flange 52 is attached to the first main surface 10 b of the first precast floor slab 10 and the first main surface 20 b of the second precast floor slab 20.
In the orthogonal direction Y, at least a part of the first inclined surfaces 15c and 15d and the second inclined surfaces 25c and 25d are arranged in a range R1 between the support surfaces 52a of the bridge beams 50 adjacent to each other in the orthogonal direction Y. Yes.
In the present embodiment, in the range R1, the upper first inclined surface 15c is supported by the lower second inclined surface 25d. Thereby, the thickness direction Z between the 1st precast floor slab 10 and the 2nd convex part 25 of the 2nd precast floor slab 20 by the 1st convex part 15 moving below with respect to the 2nd convex part 25. It is possible to suppress the formation of a step in the surface.

  On the other hand, the case of the comparative example which does not satisfy | fill said conditions is demonstrated using FIG. In this case, as shown by the imaginary line L11, the second convex portion 25 is curved so as to be convex downward over the entire range R1. As a result, a relatively large step D1 is formed between the first precast floor slab 10 and the second convex portion 25.

Moreover, about the structure of the road bridge 3 in the cross section in the position where the bridge beam 50 supports the 2nd convex part 25 of the 2nd precast floor slab 20 like the range R2 shown in FIG. explain.
The second inclined surface 25d is directed to the other side Y2 in the orthogonal direction Y as it moves in the thickness direction Z (downward) from the second main surface 20c of the second precast slab 20 toward the first main surface 20b. It is inclined to. An end 25e on one side Y1 in the orthogonal direction Y of the second inclined surface 25d is disposed on the support surface 52a of the bridge girder 50. That is, when viewed in parallel with the thickness direction Z, the end 25e of the second inclined surface 25d is disposed within the range occupied by the support surface 52a of the bridge girder 50.
For this reason, in the arrangement direction X, the wheel is directed downward along the thickness direction Z to the position Q1 of the first convex portion 15 on the other side Y2 in the orthogonal direction Y than the other side Y2 in the orthogonal direction Y of the support surface 52a. A load P is applied. The wheel load P is disposed below the first protrusion 10 on which the wheel load P is applied via the second inclined surface 15c and the first inclined surface 25d, and is supported by the bridge girder 50. 25.

On the other hand, the case of the comparative example which does not satisfy | fill said conditions is demonstrated using FIG. In this comparative example, for example, when viewed in parallel with the thickness direction Z, the end 25e of the second inclined surface 25d is disposed at the position Q2 on the other side Y2 in the orthogonal direction Y with respect to the range occupied by the support surface 52a. Yes.
In this case, the wheel load P acts on the second convex portion 25, but the second convex portion 25 has no first convex portion 10 or bridge girder 50 that supports the second convex portion 25 below the second convex portion 25. The end portion on the other side Y2 of the 25 orthogonal direction Y is curved downward as indicated by an imaginary line L12.

Moreover, as shown in FIG. 11, the bridge girder 50 arranged at the end of one side Y1 in the orthogonal direction Y among the plurality of bridge girders 50 will be referred to as a bridge girder 50A. The bridge girder 50A supports the second convex portion 25 of the second precast floor slab 20 and is first in one direction Y1 in the orthogonal direction Y with respect to the second convex portion 25, as in the range R3. The configuration of the road bridge 3 in the cross section at the position where the first convex portion 15A that is the convex portion 15 is disposed will be described.
The second inclined surface 25c is inclined so as to move toward the one side Y1 in the orthogonal direction Y as it moves downward along the thickness direction Z. An end 25f on the other side Y2 of the second inclined surface 25c in the orthogonal direction Y is disposed on the support surface 52a of the bridge beam 50A. That is, when viewed in parallel to the thickness direction Z, the end 25f of the second inclined surface 25d is disposed within a range occupied by the support surface 52a of the bridge girder 50A.

  For this reason, the wheel load P is applied to the position Q3 of the first convex portion 15A downward along the thickness direction Z. The wheel load P is disposed below the first protrusion 15A to which the wheel load P is applied via the first inclined surface 15d and the second inclined surface 25c, and is supported by the bridge girder 50A. 25.

On the other hand, the case of the comparative example which does not satisfy | fill said conditions is demonstrated using FIG. In this comparative example, for example, as the second inclined surface moves downward, the second inclined surface is inclined to the other side Y2 in the orthogonal direction Y and is disposed at the position Q4.
In this case, the wheel load P acts on the first convex portion 15A, but there is no second convex portion 25 or bridge girder 50 supporting the first convex portion 15A below the first convex portion 15A. 15A moves downward as indicated by an imaginary line L13.

As described above, according to the road bridge 3 of the present embodiment, at least one of the first inclined surfaces 15c and 15d and the second inclined surfaces 25c and 25d is provided between the support surfaces 52a of the bridge beams 50 adjacent in the orthogonal direction Y. Each part is arranged. For this reason, between the support surfaces 52a of the bridge girder 50 adjacent in the orthogonal direction Y, the upper one of the first inclined surfaces 15c, 15d and the second inclined surfaces 25c, 25d is supported from the lower one.
Further, in the arrangement direction X, the wheel load is downward along the thickness direction Z at the position Q1 of the first convex portion 15 on the other side Y2 in the orthogonal direction Y than the other side Y2 in the orthogonal direction Y of the support surface 52a. P is applied. The wheel load P is supported by the second convex portion 25 that is disposed below the first convex portion 15 and supported by the bridge girder 50 via the second inclined surface 15c and the second inclined surface 25d.
Therefore, it is possible to suppress the formation of a step in the thickness direction Z between the support surface 52a of the bridge girder 50 adjacent to each other in the intersecting direction between the one precast floor slab and the convex portion of the other precast floor slab. Can do.

The second inclined surface 25c is inclined toward the one side Y1 in the orthogonal direction Y as it moves downward along the thickness direction Z, and the end 25f on the other side Y2 in the orthogonal direction Y of the second inclined surface 25c is Are disposed on the support surface 52a of the bridge girder 50A.
For this reason, the wheel load P is applied to the first convex portion 15A in the downward direction along the thickness direction Z. The wheel load P is disposed below the first convex portion 15A via the first inclined surface 15d and the second inclined surface 25, and is supported by the second convex portion 25 supported by the bridge beam 50A.
Therefore, it is possible to suppress the formation of a step in the thickness direction Z between the first convex portion 15 </ b> A and the second precast slab 20.

In addition, in this embodiment, when the 1st convex part 15A arrange | positioned at the end of the one side Y1 of the orthogonal direction Y is supported by the supporting members 60, such as an ear girder, like the road bridge 3A shown in FIG. The second inclined surface 25c may be inclined so as to go to the other side Y2 in the orthogonal direction Y as it moves downward along the thickness direction Z.
Although the bridge structure is a road bridge, the bridge structure may be a railway bridge or the like.

  As mentioned above, although 1st Embodiment and 2nd Embodiment of this invention were explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The structure of the range which does not deviate from the summary of this invention Changes, combinations, deletions, etc. are also included. Furthermore, it goes without saying that the configurations shown in the embodiments can be used in appropriate combinations.

1, 1A, 1B Floor slab system (Precast floor slab system)
2 Connection structure (Precast floor slab connection structure)
3 road bridge (bridge structure)
10 First precast floor slab 10a, 20a Side surface 10b, 20b First main surface (main surface)
15, 15A, 30, 35 First convex portion 15c, 15d, 30c, 30d First inclined surface 20 Second precast floor slab 20c Second main surface 25, 40 Second convex portion 25c, 25d Second inclined surface 25e, 25f End 45 Filler 50, 50A Bridge girder 52a Support surface L4, L5 Intersection line X Arrangement direction Y Orthogonal direction (intersection direction)
Z Thickness direction θ angle μ Static coefficient of friction

Claims (7)

A connection structure of a precast floor slab that connects a first precast floor slab and a second precast floor slab, which are formed in a plate shape and arranged in a row direction intersecting the thickness direction,
It is formed so as to protrude from the side surface of the first precast floor slab, and is inclined so as to go to one side of the thickness direction as it goes to one side of the intersecting direction that intersects the thickness direction and the alignment direction, respectively. A first convex portion having a first inclined surface;
A second protrusion having a second inclined surface that is formed so as to protrude from a side surface of the second precast slab, is inclined along the first inclined surface, and is in contact with the first inclined surface;
With
Movement of the first convex portion and the second convex portion in the direction along the first inclined surface is a static frictional force acting between the first inclined surface and the second inclined surface, or the first A connection structure for a precast slab, which is regulated by a fixing force acting on one inclined surface and the second inclined surface. The movement of the first convex portion and the second convex portion in the direction along the first inclined surface is regulated by the static friction force acting between the first inclined surface and the second inclined surface,
In the cross section orthogonal to the arrangement direction, when the angle formed between the main surface of the first precast slab and the first inclined surface is θ (rad), the first inclined surface and the second inclined surface The precast slab connection structure according to claim 1, wherein a static friction coefficient of the tan θ is equal to or greater than a value of tan θ. Provided between the side surface of the first precast floor slab and the side surface of the second precast floor slab, comprising a filler that is fixed to the first inclined surface and the second inclined surface,
The movement of the first convex portion and the second convex portion in the direction along the first inclined surface acts between the first inclined surface and the filler, and the second inclined surface. 2. The precast slab connection structure according to claim 1, wherein the precast slab connection structure is regulated by the fixing force acting between the slab and the filler.   The at least part of the intersection line of the surface which extended the main surface of the said 1st inclined surface and the said 1st precast slab is curvilinear, It is any one of Claim 1 to 3 characterized by the above-mentioned. Precast floor slab connection structure. The connection structure of the precast slab according to claim 1;
The first precast slab;
The second precast slab;
A precast floor slab system characterized by comprising: A precast slab system according to claim 5;
A support surface is attached to the main surface of the first precast floor slab and the main surface of the second precast floor slab, and extends in the alignment direction and is arranged in a row at intervals in the intersecting direction, the first precast floor slab A bridge girder supporting the plate and the second precast slab from below;
With
In the crossing direction, between the support surfaces of the bridge girders adjacent in the crossing direction, at least a part of the first inclined surface and the second inclined surface is respectively disposed.
In a cross section at a position orthogonal to the alignment direction and where the bridge beam supports the second convex portion of the second precast slab,
The second inclined surface is inclined so as to be directed to one side of the intersecting direction as it moves in the thickness direction from the second main surface of the second precast slab to the main surface side, and the second A bridge structure characterized in that the other end of the inclined surface in the crossing direction is disposed on the support surface of the bridge girder. The second projecting portion of the second precast floor slab orthogonal to the arrangement direction is supported by the bridge beam arranged at the other end of the crossing direction among the plurality of bridge beams, and the second projecting portion. In the cross section at the position where the first convex portion is arranged on the other side of the cross direction than
The second inclined surface is inclined so as to go to the other side in the intersecting direction as it moves in the thickness direction from the second main surface of the second precast slab to the main surface side, and the second The bridge structure according to claim 6, wherein one end of the inclined surface in the intersecting direction is disposed on the support surface of the bridge girder.

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