JPH06108407A - Expansion joint for bridge road - Google Patents

Abstract

PURPOSE:To reduce accidents by connecting a plurality of links at the front ends of comb teeth relatively rotatably through pins in the axial direction, supporting links on the opposite side to the faces of the comb teeth and installing guide rollers to the lower section of the comb teeth. CONSTITUTION:When a section between the front end 3a of a comb tooth 3 and the face 3b of a comb tooth 3 on the opposite side is shortened by thermal expansion, etc., each link 6 of a link band 5 is brought near and moved in the direction of the face 3b, and creeps to the lower section of the comb tooth 3 while being supported and guided by rollers 13, 14, 15. When the section between the front end 3a and the face 3b is expanded, each link 6 is separated and moved in the direction of the face 3b, and led out from the lower section of the comb tooth 3 while being supported and guided by the rollers 13, 14, 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge expansion joint having a road surface such as a bridge, a PC girder bridge supported by stanchions, or a steel bridge, that is, a bridge expansion joint in which straight comb teeth are combined to face each other. It is about.

[0002]

2. Description of the Related Art Conventionally, a serrated expansion joint is often used for a bridge having a small amount of expansion and contraction. When the amount of expansion and contraction becomes a little large, a linear comb-shaped expansion joint as shown in FIGS. 12 and 13 is adopted. That is, the pair of bridges 41, 42 are provided with straight comb teeth 43 at mutually opposite ends so as to allow expansion and contraction between the comb tooth tip 43a and the mating comb tooth root 43b. The gap 44 is formed.

According to this conventional structure, the comb tooth tip 43a and the comb tooth root 43b move toward or away from each other as the bridges 41 and 42 expand and contract, and the expansion and contraction shortens and lengthens the gap 44. To do.

[0004]

However, according to the above-mentioned conventional structure, when the gap 44 becomes long, the wheels of the traveling vehicle and the like fall into the gap 44 and receive a large impact, which may cause an accident or noise. There was a problem that became.

An object of the present invention is to provide a cross-linked expansion joint which allows the expansion joint on the road surface to be smooth and to eliminate gaps as much as possible.

[0006]

In order to solve the above problems, an expansion joint for a bridge road according to the first aspect of the present invention is a bridge expansion joint in which straight comb teeth are combined and opposed to each other. Is connected in the length direction so as to be rotatable relative to each other via a pin in the width direction, and a roller is provided at the root of the comb tooth for supporting the link on the other side and guiding it below the comb tooth. .

Further, in the expansion joint for a bridge road according to the second aspect of the present invention, each link is formed with a stopper portion for restricting the rotation in the loading direction, and a linear bottom portion extending in the length direction and a circle provided as a recess. The arc-shaped bottom portion is formed, and the roller is divided into a first roller that supports the linear bottom portion and a second roller that supports the arc-shaped bottom portion.

[0008]

According to the structure of the first invention described above, when the distance between the tip of the comb tooth and the root of the mating comb tooth is reduced due to thermal expansion or the like, each link approaches in the direction of the mating tooth root of the mating side. While moving and being supported and guided by the rollers, they sneak under the comb teeth. In addition, when the distance between the tip of the comb tooth and the root of the mating tooth on the mating side expands, each link moves away from the root direction of the mating tooth on the mating side, and is supported and guided by the rollers, Be withdrawn. As described above, in the expansion joint, the plurality of links fills and closes the gap generated between the comb tooth tip and the mating tooth root of the mating side, and these links follow the expansion and contraction of the gap. Therefore, there is almost no gap in the expansion joint.

According to the structure of the second aspect of the present invention described above, by forming a stopper portion for restricting the rotation in the loading direction on each link, a vehicle or the like passes over each link and a load is applied to each link. However, the link does not rotate in the loading direction. At the same time, the top load applied to each link is supported by the first roller and the tips of the comb teeth, so that the top load can be sufficiently received by each link. Further, since the second roller supports the arcuate bottom surface portion, the link is smoothly guided below the comb teeth while drawing an arcuate trajectory.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 and FIG. 2, linear comb teeth 3 which are mutually interlocked are provided at opposite ends of a pair of bridges 1 and 2, and a comb tooth tip 3a and a mating comb tooth root 3b are provided. A gap 4 for allowing expansion and contraction is formed between them.

Link bands 5 having base ends connected to the respective comb tooth tips 3a are provided in the longitudinal direction, and free ends of the link bands 5 can be stored under the mating tooth roots 3b of the mating side. The gap 4 is closed by a link band 5. Furthermore, each link band 5 is a rod-shaped body in the loading direction W, and can be bent downward when stored.

That is, as shown in FIGS. 3 and 4, each link band 5 has a plurality of links 6, and each link 6 has a connecting convex portion 6a at one end in the length direction and the other end at the other end. A connecting concave portion 6b is formed, and both 6a and 6b are relatively rotatably coupled by a widthwise pin 7 in a state where the convex portion 6a is fitted in the concave portion 6b.

Above the pin 7, a stopper portion 6c is provided on the outer end surface of the concave portion 6b so as to come into contact with and separate from the base end surface of the fitted convex portion 6a. These stopper portions 6c regulate the rotation in the mounting load direction W. That is, as shown by the solid line and the alternate long and short dash line in FIG. 3, when the stopper portion 6c abuts on the base end surface of the convex portion 6a, the adjacent links 6 are positioned linearly, and As indicated by the two-dot chain line, when the adjacent links 6 are rotated around the pin 7 so that the stopper portion 6c is separated from the base end surface of the convex portion 6a, the link 6 on the free end side bends downward. Is configured. As shown in FIG. 1, the concave portion 6b of the link 6 at the base end of each link band 5 is fitted into the convex portion 8 formed on the comb tooth tip 3a, and is connected by a pin 7 so as to be relatively rotatable. ing.

As shown in FIGS. 3 and 4, the upper surface of each link 6 is formed in an arcuate curved surface that is provided so as to project upward.
A straight bottom surface portion 9 is formed in the central portion of the bottom surface of each link 6 along the lengthwise direction, and concave arcuate bottom surface portions 10 are juxtaposed along the lengthwise direction at both end portions of the bottom surface.

As shown in FIGS. 1 and 5, the comb tooth root 3b is shown.
On the side, a first roller 13 that supports and guides the link 6 and both second rollers 14 and 15 are provided. Each of the first and second rollers 13, 14 and 15 is rotatably mounted between the adjacent comb teeth 3 in the width direction via the pin 16 about the width direction axis 17. Of these, the first roller 13 is formed in a cylindrical shape and is positioned ahead of the second rollers 14 and 15. Further, both of the second rollers 14 and 15 are formed in a cylindrical shape having large diameters at both ends, and are located closer to the tooth root 3b than the first roller 13. The first roller 13 and the one second roller 14 are set at the same level, and the second roller 15 on the tooth root 3b side is set lower than the one second roller 14. The first roller 13 is abuttable on the linear bottom surface portion 9 of the link 6, and the second rollers 14 and 15 are abuttable on the arcuate bottom surface portion 10 of the link 6 only at the large diameter portions on both ends.

As shown in FIG. 1, an abutment plate 18 is provided on the tooth root 3b side of each comb tooth. That is, the base end of the contact plate 18 is connected to the receiving portion 21 protruding from the comb tooth root 3b via the countersunk bolt 19 and the nut 20. The receiving part
A coil spring 22 is provided between the lower surface of 21 and the upper surface of nut 20 so that contact plate 18 can be finely moved and is inserted into countersunk bolt 19. The free end of the contact plate 18 is located above the second rollers 14 and 15 and is formed as an inclined surface that is slidably contactable with the upper surface of the link 6. Then, the upper surface of the contact plate 18 and the upper surface of the link 6 in the rod-shaped portion of the link band 5,
The upper surface of the comb tooth 3 is set at the same level. Further, the height h of the comb tooth tip 3a is the height H of the link 6.
(See FIG. 3).

The operation of the above structure will be described below.
As shown in FIG. 1, the link band 5 has a first roller 13 on the free end side.
Is supported by and is maintained in a horizontal position with the base ends fixed to the bridges 1 and 2. Even if an automobile or the like passes over each link 6 and a load is applied to each link 6, the stopper portion 6c abuts on the base end surface of the convex portion 6a of the adjacent link 6 to regulate the rotation in the loading direction W. Therefore, the link band 5 is a rod-shaped body that does not bend in the overloading direction W, and the road surface that is the upper surface is formed smoothly. Further, since the top load applied to each link 6 is supported by the first roller 13 and the comb tooth tip 3a, the top load can be sufficiently received by each link 6.

As shown in FIG. 6, when the distance between the comb tooth tip 3a and the mating comb tooth root 3b is reduced due to thermal expansion or the like, each link 6 has a mating comb tooth root 3b.
It moves closer to each other in the direction, and is sunk under the comb teeth 3 while being supported and guided by the rollers 13, 14, 15. At this time, since the second rollers 14 and 15 support the arcuate bottom surface portion 10, the link 6
Is smoothly guided below the comb teeth 3 while drawing an arcuate trajectory. The height h of the comb tooth tip 3a is the height H of the link 6.
Since the gap 4 is the smallest and the comb tooth tip 3a moves above the first roller 13, the lower surface of the comb tooth tip 3a does not contact the outer peripheral surface of the first roller 13. .

Further, as shown in FIG. 1, the comb tooth tip 3a
When the space between the mating tooth root 3b and the mating side of the mating tooth expands, each link 6 moves away from the mating tooth tooth root 3b of the mating side and is guided and supported by the rollers 13, 14, 15 while It is pulled out smoothly from below 3. Thus, in the expansion joint, the comb tooth tip 3a and the mating tooth root 3b on the mating side are formed.
Since a plurality of links 6 fills and closes the gap 4 generated between and, these links 6 move following the expansion and contraction of the gap 4, so that there is almost no gap in this expansion joint part. .

In the above embodiment, as shown in FIG. 2, when the distance between the adjacent comb teeth 3 is A and the widths of the comb teeth 3 and the links 6 are B, the width of the interdigitated comb teeth 3 is increased. Although the gap S is formed in the above, the gap S may be sealed with a sealing material.

In the above embodiment, as shown in FIG.
When the width B of the comb tooth 3 and the link 6 is set to B ≦ (D / 2) with respect to the width D of the wheel 25 of the traveling vehicle, the loading load (wheel load) is plural comb teeth 3 and the link band. It is distributed over 5 and. Therefore, in such a case, the link belt 5 may be strong enough to support a light load such as a small vehicle having a small wheel width D, a motorcycle, and a bicycle.

In the above embodiment, the cross section of the comb tooth 3 is formed in a rectangular shape. However, this is not limited to the rectangular shape, and the upper surface has a predetermined width B as shown in FIGS. Section I
It may be formed into a shape or an inverted triangular shape.

In the above embodiment, three rollers 13, 14, 15 are provided on the tooth root 3b side, but the number of rollers is not limited to three. In addition, each roller 13, 14, 15
Are attached to each other via pins 16, but each roller 13, 14, 15 may be unitized and fitted between the adjacent comb teeth 3 in the width direction.

In the above embodiment, a tray for collecting water leaks and dust may be installed below the comb teeth 3. In the above embodiment, as shown in FIG. 2, the comb tooth 3 and the link band 5 are
Are arranged in a straight line in a plan view, but in places where the road surface is curved, as shown in FIG. 10, the comb teeth 3 and the link strips 5 are curved along a curve in a plan view. You may arrange.

In the above embodiment, as shown by the phantom line in FIG. 1, a reinforcing member 24 may be provided to connect the lower parts of the comb teeth 3 in the width direction. According to this, even if the amount of expansion and contraction is large, it is possible to sufficiently reinforce each other's comb teeth 3.

FIG. 11 shows another embodiment of the present invention. That is, the link mechanism 26 connects the comb tooth roots 3 b of the comb teeth 3 facing each other and the intermediate portion of the comb teeth 3. The link mechanism 26 is provided on the back side of the comb teeth 3 and is formed so as to be expandable and contractable in the length direction (expansion and contraction direction) of the comb teeth 3. The rest of the configuration and operation are the same as in the previous embodiment. According to this, a large amount of expansion and contraction can be dealt with.

[0027]

As described above, according to the first aspect of the present invention, in the expansion joint portion, the gap between the tip of the comb teeth and the root of the other comb tooth can be closed by a plurality of links. Since the link moves following the expansion and contraction of the gap, there is almost no gap in the expansion joint even when the amount of expansion and contraction is large. As a result, the wheels of the traveling vehicle can be prevented from falling into the gap, so that the traveling vehicle or the like can pass over the expansion joint section smoothly without being impacted, and accidents and noise can be reduced.

Further, according to the second aspect of the present invention, the rotation of the link with respect to the loading direction is restricted by the stopper portion, and the loading load applied to each link is supported by the first roller and the tip of the comb teeth. Therefore, each link is
It is possible to sufficiently receive the overload applied when the traveling vehicle or the like passes over the expansion joint portion. Therefore, even if the amount of expansion and contraction is large, it is possible to eliminate the need for an intermediate support or the like for supporting the load, and simplify the structure.

Further, since the second roller supports the arcuate bottom surface, the link is smoothly guided below the comb teeth while drawing an arcuate trajectory. As a result, the movement of the link following the expansion and contraction of the gap can be smoothly performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an expansion joint part according to an embodiment of the present invention.

FIG. 2 is a plan view of an expansion joint part.

FIG. 3 is a side view of a link.

FIG. 4 is a bottom view of the link.

FIG. 5 is a plan view of first and second rollers.

FIG. 6 is a vertical cross-sectional side view showing the operation of the expansion joint section.

FIG. 7 is a vertical cross-sectional front view of a plurality of comb teeth that support wheels of a traveling vehicle.

FIG. 8 is a vertical cross-sectional view of a comb tooth.

FIG. 9 is a vertical cross-sectional view of a comb tooth.

FIG. 10 is a plan view of an expansion joint part in a curved path.

FIG. 11 is a vertical cross-sectional side view of an expansion joint part according to another embodiment.

FIG. 12 is a side view of an expansion joint section in a conventional example.

FIG. 13 is a plan view of the expansion joint part.

[Explanation of symbols]

 1 bridge 2 bridge 3 comb tooth 3a comb tooth tip 3b comb tooth root 6 link 6c stopper part 7 pin 9 straight bottom part 10 arcuate bottom part 13 first roller 14 second roller 15 second roller W loading direction

Claims (2)

[Claims] 1. In a bridge expansion joint in which straight comb teeth are combined and opposed to each other, a plurality of links are connected to the tips of the comb teeth in the length direction so as to be relatively rotatable via pins in the width direction,
An expansion joint for bridge roads, characterized in that a roller for supporting the link on the other side is provided at the base of the comb tooth and guided below the comb tooth. 2. A link part is formed with a stopper part for restricting rotation in the loading direction, and a linear bottom part extending in the length direction and a concave arc-shaped bottom part are formed on the links. The expansion joint for a bridge road according to claim 1, wherein the expansion roller is divided into a first roller that supports a linear bottom surface portion and a second roller that supports an arcuate bottom surface portion.