JP3248124B2 - Bridge expansion joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint for a bridge, and more particularly to an expansion joint for a bridge having a large expansion and contraction amount.

[0002]

2. Description of the Related Art As this type of expansion joint, for example, FIG.
One is shown in FIG.

As shown in FIG. 11, this expansion joint has an elastic body 90 having a number of relatively small V-shaped grooves 90a.
And a steel plate 91a buried in an upper region in the elastic body 90.
91a and a steel plate 9 embedded in a lower region in the elastic body 90
2a, 92a, 92b, and the steel plate 9 using an anchor bolt 93 buried in the bridge girder H.
The bridge beams 2a and 92a are installed between the opposing bridge girders H and H so as to be screwed.

Accordingly, in this expansion joint, even when the distance between the bridge girders H, H changes due to a change in the ambient temperature or the like, the elastic member 90 supports the state in which the steel plate 92b is installed between the bridge girders H, H. Will expand and contract, and the car can run safely. In addition, this joint has a V-shaped groove 9
Since 0a is set to be relatively small, the vehicle is unlikely to vibrate when passing.

[0005] However, in the above expansion joint, it is an essential condition that the center portion of the expansion joint is free with respect to the floor f of the bridge girders H, H. Therefore, when the bridge girders H and H come close to each other, it is difficult to see the figure. As shown in FIG. 12, the central portion of the joint rises and separates from the floor portion f. When a step is formed in the bridge girders H, the contact between the central portion of the joint and the floor portion f is made as shown in FIG. Line contact A results. In the former case, noise occurs because the joint hits the floor f when passing through the vehicle, and in the latter case, noise, loss of the floor f, and damage to the expansion joint itself may be caused. Great nature.

[0006]

Therefore, according to the present invention, the vibration of the vehicle at the time of passage is small, and the generation of noise, the loss of the floor portion, and the damage of the expansion joint itself are less likely to occur.
In addition, it should be able to absorb the step created between the opposing bridge girders.
An object of the present invention is to provide an expansion joint for bridges that can be used.

[0007]

According to the present invention, there is provided a bridge girder H, a recessed portion h formed at an upper portion on the opposing surface side of the bridge girder H, and a gap g between the bridge girder H, H. An expansion joint for bridges installed in a space area SP consisting of:
A metal plate 1 narrower than the space area SP and wider than the gap g is provided in the space area SP, and the metal plate 1
The upper surface of the bridge girder H and the upper surface of the bridge girder H are arranged flush with each other, and the plurality of elastic plates 21 and the hard plate are fixed between the metal plate 1 and the floor f of each recess h. 20 are alternately stacked and fixed, and a large number of metal cores for increasing the rigidity in the vertical direction are provided between each edge 10 of the metal plate 1 and the side wall of the concave portion h. The laterally deformable elastic member 3 is provided on the upper surface of the bridge girder H.

(Invention of Claim 2) The present invention relates to the invention of Claim 1 described above, and has both ends 10 and 10 of the metal plate 1 provided with hanging pieces 11 respectively. (Invention of Claim 3) The present invention relates to the invention of Claim 1 or 2, wherein the receiving member 2 is anchored to the bridge girder H and the metal plate 1
It is bolted to. (Invention of Claim 4) The present invention is installed in a space area SP composed of a recessed part h formed in the upper part on the facing surface side of the bridge girders H and a gap g part between the bridge girders H and H. A finger type expansion joint for bridges, wherein a metal plate 1 narrower than the space region SP and wider than the gap g is provided in the space region SP, and the entire upper surface of the metal plate 1 and the bridge girder H The upper surface is arranged flush with the upper surface, and the metal plates 5 and 5 are arranged flush with the bridge girder H between each edge 10 of the metal plate 1 and the side wall of the recess h. Between the elastic plate 21 and the hard plate 2 in such a manner that the elastic plate 21 and the hard plate 2
0 is alternately laminated and fixed, and the opposite ends of the metal plate 1 and the metal plates 5 and 5 are formed in a finger shape, and between the metal plate 5 and the floor f. A receiving member formed by alternately laminating and fixing a plurality of elastic plates and hard plates in such a manner as to be fixed to both of them is provided.

[0009]

The present invention has the following functions. [Operation of the invention as set forth in claim 1] The receiving member 2 for connecting the metal plate 1 and the floor portion f in the normal installation state includes a plurality of elastic plates 2.
1 and the hard plate 20 are alternately laminated and fixed, so that they have a relatively large load resistance, and are provided between each edge 10 of the metal plate 1 and the side wall of the recess h. Since each of the elastic members 3 has a large number of metal cores for increasing the rigidity in the vertical direction, the upper surfaces of the metal plate 1 and the elastic members 3 sink greatly from the upper surfaces of the bridge girders H, H when passing through the vehicle. There is no such thing. When the bridge girders H and H come close to each other, the metal plate 1 is connected to the floor portion f via the receiving member 2, so that the metal plate 1 does not rise from the upper surface of the bridge girder H. A large force does not act on the metal plate 1 due to the elastic deformation of the member 2 in the shear direction.
The displacement caused by the bridge girders H approaching each other is absorbed by the contraction of the elastic member 3. And, even in this state, it has the above function. If a step is formed in the bridge girders H, H, the metal plate 1 is received by the receiving member 2 having a relatively large area, so that the floor f is not easily damaged and the expansion joint itself is not easily damaged. Further, the displacement caused by the step difference between the bridge girders H, H is absorbed by the deformation of the receiving member 2 and the elastic member 3. And, even in this state, it has the above function. [Operation of the invention according to claim 4] Since the normal installation state receiving member 2 has a relatively large load resistance, the upper surface of the metal plate 1 sinks greatly from the upper surfaces of the bridge girders H, H when passing through the vehicle. There is no such thing. Therefore, even when the vehicle passes through, the upper surfaces of the metal plates 1 and 5 are both bridge girders H and H
A state substantially coincident with the upper surface of is maintained. When the bridge girders H and H come close to each other, the metal plate 1 is connected to the floor f via the receiving member 2, so that the metal plate 1 does not rise from the upper surface of the bridge girder H. Further, a large force does not act on the metal plate 1 due to the elastic deformation of the receiving member 2 in the shearing direction. The displacement of the metal plates 1 and 5 caused by the approach of the bridge girders H and H is absorbed by the finger portions in the same manner as the conventional finger joint. And, even in this state, it has the above function. When a step is formed in the bridge girders H, H, the metal plate 1 is received by the receiving member 2 having a relatively large area, so that the floor f is not easily damaged and the expansion joint itself is not easily damaged.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described with reference to the drawings shown as embodiments.

As shown in FIG. 1, the expansion joint of this embodiment includes a recessed portion h formed in the upper portion of the bridge girder H on the facing surface side, and a gap g between the bridge girder H and H. It is installed in a rectangular space SP and has a recess h
Is attached to the bridge girders H, H via a formwork 80 provided on the wall surface.

The expansion joint S is basically composed of a metal plate 1, a receiving member 2, an expansion member 3, a sound absorbing member 4, and a seat 5, as shown in FIG.

As shown in FIGS. 1 and 2, the metal plate 1 has a main body 1a formed narrower than the space area SP and wider than the gap g, and both end edges 10, 10 of the main body 1a. , Respectively, and are arranged in such a manner that the upper surface thereof is flush with the bridge girder H in the space area SP. In addition, as shown in FIG.
A through hole 12 having a spot facing portion is provided at a position corresponding to a screw hole 26 described later.

As shown in FIG. 3, the receiving member 2 is vulcanized and bonded in such a manner that a plurality of elastic plates 21 and hard plates 20 (steel plates) are alternately laminated, and the upper and lower mounting plates 2
The upper mounting plate 22 is provided with screw holes 26 for bolting to the metal plate 1 at positions corresponding to the anchor bolts AB (see FIG. 2). A tool insertion hole 24 penetrating the plate 22, the elastic plate 21 and the hard plate 20, and an insertion hole 25 for passing the male screw portion of the anchor bolt AB is provided in the mounting plate 23.

As shown in FIG. 7, the elastic member 3 is formed by connecting a plurality of rubber members having a rhombic frame shape in a top view, and each of the vertical plate portions forming the frame shape has a rigidity in a vertical direction. A core bar (not shown) for heightening is embedded. Note that one end of the elastic member 3 is fixed to the hanging piece 11 of the metal plate 1, and the other end is fixed to the side wall forming the recess h.

The sound absorbing member 4 is for absorbing the sound generated when passing through the vehicle, and is formed of a rubber or resin foam formed in a vertically long band shape as shown in FIG. ).

As shown in FIG. 2, the seat body 5 is made of a thick metal plate (which may be plastic, rubber, or the like), on which the sound absorbing member 4 and the telescopic member 3 are placed. Is done.

Since the bridge expansion joint of this embodiment has the above-described structure, it has the following functions. [At the time of passing the vehicle] As described in the column of action, the rigidity of the receiving member 2 for receiving the metal plate 1 and the presence of the metal core of the elastic member 3 cause the metal plate 1 and the elastic The upper surface of the member 3 does not sink greatly from the upper surfaces of the bridge girders H, H. Therefore, it does not cause vibration of the vehicle when passing through the joint. [When the bridge girders H and H come close to each other] FIG.
As shown in (1), the metal plate 1 is attached to the floor f via the receiving member 2, so that the metal plate 1 does not rise greatly from the upper surface of the bridge girder H. Therefore, such a phenomenon that the joint hits the floor portion f when passing through the vehicle, such as the expansion joint described in the section of the prior art, does not occur at all. Further, since the receiving member 2 is elastically deformed as shown in FIG. 4, a large force does not act on the metal plate 1. The bridge girder H,
The distortion caused by the close proximity of H is shown in FIGS.
Is absorbed by the contraction of the elastic member 3 as shown in FIG. The receiving member 2 is elastically deformed by the force in the shearing direction, the sound absorbing member 4 is also deformed, and the elastic member 3 is also deformable in the lateral direction. There is no possibility that the strong force generated when the joint acts as a destructive force of the joint itself. [Regarding the case where a step is formed in the bridge girders H, H] As shown in FIG. 5, the metal plate 1 is received by the floor portion f with a relatively large area via the receiving member 2, so that the column of the prior art is described. As described above, the generation of noise, the loss of the floor and the breakage of the expansion joint itself are unlikely to occur. [When the bridge girders H and H are largely separated from each other] FIG.
As shown in the figure, the receiving member 2 is elastically deformed in the shearing direction.
Since the metal plate 1 is received by the receiving member 2, it does not sink much from the upper surface of the bridge girder H. The receiving member 2 is elastically deformed by the force in the shearing direction, the sound absorbing member 4 is also deformed, and the elastic member 3 is also deformable in the lateral direction. There is no possibility that the strong force generated when the joint acts as a destructive force of the joint itself.

It should be noted that the elastic member 3 of the above embodiment can be changed to a form as shown in FIGS.

FIG. 8 shows a structure in which an I-shaped member 30 made of metal and a U-shaped member 31 (both function as a core metal) are connected by an R-shaped plate member 32 having elasticity. In order to prevent the I-shaped member 30 and the U-shaped member 31 from protruding from the upper surface of the bridge girder H and to be able to absorb the longitudinal expansion and contraction of the bridge girder H, the I-shaped member 30 and the U-shaped member 31 are formed. A configuration is adopted in which the shaft 33 is loosely inserted into a hole 33 ′ provided in the 31. One end of the shaft 33 is connected to the metal plate 1.
Is loosely inserted into a hole (not shown) provided in the hanging piece 11.

FIG. 9 shows an upright metal plate 34.
The rubber vertical members 35 (functioning as a core metal) are connected to each other by a rubber V-shaped member 36.

On the other hand, the embodiment shown in FIG. 10 is a finger joint, in which a metal plate 1 narrower than the space SP and wider than the gap g is arranged flush with the bridge girder H in the space SP. At the same time, the metal plates 5 and 5 are arranged between each edge 10 of the metal plate 1 and the side wall of the recess h so as to be flush with the bridge girder H, and the opposite ends of the metal plate 1 and the metal plates 5 and 5 are opposed to each other. Has a finger shape. Then, between the metal plate 1 and the floor portion f of each recess h, the metal plate 1 is fixed to both of them,
A receiving member 2a formed by alternately laminating and fixing a plurality of elastic plates and hard plates is provided, and is fixed between the metal plate 5 and the floor portion f of each recess h by both of them. And a receiving member 2b formed by alternately stacking and fixing a plurality of elastic plates and hard plates. In FIG. 10, reference numeral 60 denotes urethane foam, reference numeral 61 denotes an elastic sealing material, and reference numeral 62 denotes a waterproof rubber.

Therefore, this finger joint is less likely to generate noise, break the floor, and damage the expansion joint itself.

[0024]

From what has been described in the column of the working according to the present invention, less vibration of the vehicle at the time of passage, also, generation of noise, rather deficient and expansion joint itself damage the floor portion difficulty occurs, further
In addition, it is possible to absorb the step created between the opposing bridge girders.
We can provide an expansion joint for a bridge that can be used.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a space area in which a bridge expansion joint according to an embodiment of the present invention is installed.

FIG. 2 is a perspective view showing a state where the bridge expansion joint is installed in a space area.

FIG. 3 is a perspective view showing a receiving member and a metal plate constituting the expansion joint for a bridge.

FIG. 4 is a cross-sectional view showing a state of the bridge expansion joint when bridge girders approach each other.

FIG. 5 is a cross-sectional view showing a state of the bridge expansion joint when a step is formed between the bridge girders.

FIG. 6 is a cross-sectional view showing a state of the bridge expansion joint when the bridge girders are separated from each other.

FIG. 7 is a perspective view of a receiving member constituting the expansion joint for a bridge.

FIG. 8 is a perspective view of a receiving member of another embodiment constituting the expansion joint for bridges.

FIG. 9 is a perspective view of a receiving member of another mode constituting the expansion joint for bridges.

FIG. 10 is a sectional perspective view of a finger-type expansion joint for a bridge according to an embodiment of the present invention.

FIG. 11 is a cross-sectional view of a prior art expansion joint for bridges.

FIG. 12 is a sectional view showing a state of a prior art expansion joint for bridges when bridge girders approach each other.

FIG. 13 is a sectional view showing a state of the bridge expansion joint when a step is formed between the bridge girders.

[Explanation of symbols]

 H Bridge girder h Depressed part g Gap SP Space area 1 Metal plate 2 Receiving member 2a Receiving member 2b Receiving member 3 Elastic member 4 Sound absorbing member 5 Seat 10 Both end edges 11 Hanging piece 20 Hard plate 21 Elastic plate

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshinari Oda 172 Ikezawa-cho, Yamatokoriyama-shi, Nara Pref. Nita Plant (56) References JP-A-59-114305 (JP, A) 40304 (JP, U) Jiko 58-30818 (JP, Y2)

Claims (4)

(57) [Claims] 1. A space area (SP) comprising a recess (h) formed at the upper part of the bridge girder (H) (H) on the facing surface side and a gap (g) between the bridge girder (H) (H). And (b) providing a metal plate (1) narrower than the space area (SP) and wider than the gap (g) in the space area (SP). The entire upper surface of the metal plate (1) and the upper surface of the bridge girder (H) are arranged flush with each other, and are fixed to the floor (f) of each recess (h) of the metal plate (1). Receiving member (2) formed by alternately stacking and fixing a plurality of elastic plates (21) and hard plates (20).
Is disposed between each edge (10) of the metal plate (1) and the side wall of the concave portion (h). An expansion joint for a bridge, characterized in that an expansion member (3) is provided flush with the bridge girder (H). 2. Edges (10) (10) of both ends of a metal plate (1)
The expansion joint for a bridge according to claim 1, characterized in that each of the expansion joints has a hanging piece (11). 3. The expansion joint for bridges according to claim 1, wherein the receiving member (2) is anchored to the bridge girder (H) and bolted to the metal plate (1). 4. A space area (SP) comprising a recess (h) formed on an upper portion of the bridge girder (H) (H) on the facing surface side and a gap (g) between the bridge girder (H) (H). ) Is a finger type expansion joint for a bridge, wherein a metal plate (1) narrower than the space (SP) and wider than the gap (g) is provided in the space (SP). At the same time, the entire upper surface of the metal plate (1) and the upper surface of the bridge girder (H) are arranged flush with each other, and further, each edge (10) of the metal plate (1) and the side wall of the recess (h) are formed. The metal plates (5) and (5) are arranged flush with the bridge girder (H) between the metal plates (1) and the floor (f) of each recess (h). In a fixed manner, a receiving member (2) formed by alternately laminating and fixing a plurality of elastic plates (21) and hard plates (20) is provided, and the metal plate (1) and the metal plate (5) are arranged. A) a plurality of elastic plates and a hard plate are alternately laminated between the metal plate (5) and the floor (f) so as to be fixed to the metal plate (5) and the floor (f); An expansion joint for a bridge, comprising a receiving member fixedly provided.