JP2022019225A - Functional expandable material provided in expansion joint gap of structure - Google Patents

Abstract

To provide a functional expandable material that is provided in a joint gap and hard to deteriorate over time with sufficient cut-off effect.SOLUTION: A functional expandable material (1) that is provided in a joint gap of floor slabs (3) of a bridge girder of a bridge or elevated road so as to prevent the drop of rain water is configured by a substantially rectangular parallelepiped foam (6) made of foamed rubber and a pair of lateral plates (7). The foamed rubber is obtained by foaming natural rubber or synthetic rubber by inert gas. The foam (6) is impregnated with asphalt for a predetermined period of time from a top surface to a predetermined depth, such as 5 mm to 40 mm. The lateral plate (7) is stuck to a pair of lateral surfaces of the foam (6) impregnated with asphalt.SELECTED DRAWING: Figure 1

Description

The present invention relates to a functional elastic material provided in the expansion / contraction space of a structure, and is not limited to the structure suitable as a water blocking material provided in the space of a bridge girder in a bridge or an elevated road. It relates to a functional elastic material provided in the telescopic play space.

A so-called telescopic clearance portion is formed in a bridge, an elevated road, a structure provided in the vicinity of a predetermined building, or the like. Taking a bridge as an example, a bridge is composed of a bridge girder installed on a pier and an asphalt mixture laid on the bridge girder. A predetermined gap, that is, a play space is formed between these adjacent bridge girders. The play space is provided to escape the expansion and contraction of the bridge girder due to the thermal expansion of the temperature change and to mitigate the influence of an earthquake or tremor, and in this specification, it is referred to as an expansion and contraction space portion, that is, a telescopic space portion. A predetermined water stop structure as proposed in Patent Documents 1 and 2, for example, is provided between the bridge girders so that rainwater falling on the road does not fall downward.

Japanese Unexamined Patent Publication No. 2016-56544 Jitsukosho 46-35554

By the way, conventionally, a water blocking material made of foam rubber is often adopted as a water blocking structure. Alternatively, a water blocking material made of foam rubber may be used in combination with other water blocking structures. The water blocking material made of foamed rubber is made of natural rubber foamed with an inert gas or the like or synthetic rubber such as foamed urethane, and is formed in a rectangular parallelepiped shape long in the road width direction. Such a water blocking material is inserted in the play space. Since the waterproof material is made of foam rubber and has elasticity, it is possible to appropriately absorb fluctuations in the size of the play due to seasonal temperature changes or momentary changes in the size of the play caused by vehicle running. It has become.

The fall of rainwater between bridge girders can be prevented by a conventional water blocking material made of foam rubber, but there are some problems to be solved with such a water blocking material. First, there is the problem of deterioration. When the waterproof material is formed from the foamed natural rubber, the elastic force is large at the initial stage and the fluctuation of the size of the play can be absorbed, but after a predetermined period of time, the deterioration progresses and the elastic force disappears. In addition, when a waterproof material is formed from foamed synthetic rubber, the degree of loss of elastic force due to deterioration is relatively small, but there is a problem in resistance to ultraviolet rays, that is, weather resistance, and it also deteriorates after a predetermined period of time. .. In any case, as the deterioration progresses, it becomes impossible to cope with the fluctuation between the play, and the water blocking effect is lost. There are other problems as well. The problem is that the water blocking effect is not always sufficient even with a water blocking material that has not deteriorated. In the water blocking material made of foam rubber, the bubbles inside are continuous at a predetermined ratio. That is, continuous bubbles are formed at a predetermined ratio inside the waterproof material. Most of the rainwater is stopped by the water blocking material, but some rainwater falls along the continuous bubbles formed inside the water blocking material.

By the way, in the telescopic space, there are various other types besides the space between the bridge girders, and a predetermined gap is formed between the walls of the building or between the wall of the building and another structure, and these are also the telescopic space. It is a department. Joint materials may also be provided in such telescopic play areas for the purpose of dropping rainwater, stopping water, or for soundproofing. However, although the waterproof structure described in Patent Documents 1 and 2 is supposed to be provided in the gap between bridge girders, it is not supposed to be provided in other telescopic gaps.

An object of the present invention is to provide a functional elastic material provided in an expansion / contraction space that solves the above-mentioned problems. A functional elastic material that can be used as a water-stopping material with a sufficient water-stopping effect, and if it is installed in the joint gap of other structures, not only water-stopping and waterproofing but also soundproofing. The purpose is to provide.

In order to achieve the above object, the invention according to claim 1 is a functional elastic material provided in a joint gap or an elastic gap portion of a bridge or a structure for the purpose of waterproofing, waterproofing, and soundproofing. The functional elastic material comprises a foam formed in a substantially rectangular shape from foam rubber, and the foam is impregnated with asphalt from its surface to a predetermined depth. It is configured as a functional elastic material provided in the portion.
The invention according to claim 2 is the functional stretchable material according to claim 1, wherein the asphalt impregnation depth of the foam is 5 mm to 40 mm, and the stretchable space portion of the structure is characterized. It is configured as a functional elastic material provided.
The invention according to claim 3 is the functional elastic material according to claim 1 or 2, wherein the functional elastic material is a foam and a pair of side plates bonded to a pair of surfaces of the foam. It is configured as a functional elastic material provided in the expansion / contraction space of the structure, which is characterized by the above.

As described above, the present invention is intended for a functional stretchable material provided in a joint gap or a stretchable gap portion of a bridge or a structure for the purpose of waterproofing, waterproofing, and soundproofing. According to the present invention, the functional elastic material includes a substantially rectangular parallelepiped foam made of foam rubber, and the foam is impregnated with asphalt from the surface to a predetermined depth. Then, since the surface of the foam is protected by asphalt, it is less susceptible to the influence of ultraviolet rays, and internal deterioration is prevented. In addition, asphalt prevents water from penetrating, so that the water blocking effect is substantially complete. Since the asphalt does not penetrate into the foam, the elastic force, that is, the repulsive force of the foam is sufficiently maintained. Therefore, even if the size of the play space fluctuates, the fluctuation can be appropriately absorbed. Furthermore, since the asphalt does not penetrate into the foam, the asphalt does not protrude from the foam even if the foam is strongly compressed. That is, the water blocking material according to the present invention is less likely to deteriorate over a long period of time, and the elastic force is maintained, and a substantially complete water blocking effect is maintained. Furthermore, since it absorbs vibration, a soundproofing effect can be obtained. The functional stretchable material of the present invention can also be provided in the stretchable play space of a structure other than the bridge, and has the effects of water blocking, waterproofing, and soundproofing. According to another invention, the asphalt impregnation depth is 5 mm to 40 mm. The asphalt impregnation depth may be shallow enough in this way, and such an impregnation depth is guaranteed to sufficiently suppress the progress of deterioration of the foam, that is, the functional elastic material, and is sufficient to stop the asphalt. A water effect will be obtained. According to yet another invention, the functional stretchable material comprises a foam and a pair of side plates attached to a pair of side surfaces of the foam. When it is provided in the play space of the bridge girder, it is connected to the floor slab via the side plate, so that the foam rubber is protected and the progress of deterioration is further suppressed.

It is a front sectional view which shows the functional elastic material which concerns on embodiment of this invention provided in the space between the adjacent bridge girder of a bridge or an elevated road, and the floor slab of each bridge girder.

Hereinafter, embodiments of the present invention will be described. As shown in FIG. 1, the functional elastic material 1 according to the present embodiment is provided in the play space of the floor slabs 3 and 3 constituting the bridge girder. As shown in FIG. 1, the functional elastic material 1 may be provided alone in the play space, or may be used in combination with another waterproof structure such as a gutter structure. The upper surface of the floor slabs 3 and 3 is paved with a predetermined paving material, and a joint structure 5 made of, for example, a finger joint is provided at the joint portion between the floor slabs 3 and 3. The functional elastic material 1 according to the present embodiment is provided below the joint structure 5.

The functional elastic material 1 according to the present embodiment is formed in a rectangular parallelepiped shape long in the road direction, and is a substantially rectangular parallelepiped foam 6 and a pair of foams 6 bonded to a pair of side surfaces thereof. It is composed of side plates 7 and 7. The foam 7 is made of natural rubber or synthetic rubber such as urethane, which is foamed by an inert gas or the like. That is, it is made of foam rubber. In the foam 7, the bubbles include not only individual independent bubbles but also a large number of continuous bubbles in which the bubbles are continuous. That is, the foam rubber is in the form of a porous sponge. Since a large number of voids including continuous bubbles are formed inside in this way, the foam 7 can be easily deformed by compression and has appropriate elasticity, that is, repulsive force.

The functional elastic material 1 according to the present embodiment is characterized in that the surface of the foam 6 is impregnated with asphalt by a predetermined depth. The asphalt to be impregnated is preferably low-viscosity asphalt having a viscosity of 150 to 500 mPa · s at room temperature. Since such low-viscosity asphalt easily penetrates into narrow voids, it can be easily impregnated. By immersing the foam 6 in the low-viscosity asphalt for a predetermined time, the foam 6 is impregnated into the asphalt at a depth of about 5 mm to 40 mm from the surface thereof. At this time, the asphalt is impregnated with an amount of 2.5 ml to 10 ml per 100 cm ² from the surface of the foam 6. If low-viscosity asphalt with a lower viscosity is used, the impregnation amount becomes large and penetrates into the foam 6 to become too deep. Then, the repulsive force becomes small at the time of compression, and it causes the asphalt to protrude to the outside at the time of compression. Further, with asphalt having a high viscosity, it becomes difficult to properly impregnate the foam 6.

The side plates 7 and 7 can be formed of a metal plate such as synthetic resin, rubber, or a steel plate. Alternatively, it can be made of a hard foamed resin. Such side plates 7 and 7 are bonded to a pair of side surfaces of the foam 6 impregnated with asphalt.

The functional elastic material 1 according to the present embodiment compresses the foam 6 to reduce the distance between the side plates 7 and 7, and is inserted into the play space of the floor slabs 3 and 3. The foam 6 expands due to elasticity, the side plates 7 and 7 are pressed against the end faces of the floor slabs 3 and 3, and the functional elastic material 1 is provided with a predetermined pressing force in the play space. That is, the functional elastic material 1 adheres to the floor slabs 3 and 3 without gaps, thereby preventing the rainwater from falling downward. If necessary, the side plates 7 and 7 may be adhered to the end faces of the floor slabs 3 and 3.

1 Functional elastic material 3 Floor slab 5 Joint structure 6 Foam 7 Side plate

Claims (3)

A functional stretchable material provided in joint gaps or stretchable gaps of bridges or structures for the purpose of waterproofing, waterproofing, and soundproofing.
The functional elastic material comprises a foam formed in a substantially rectangular parallelepiped shape from foam rubber, and the foam is impregnated with asphalt from its surface to a predetermined depth in an elastic space portion of a structure. Functional elastic material provided. The functional elastic material according to claim 1, wherein the asphalt impregnation depth of the foam is 5 mm to 40 mm, and the functional elastic material is provided in the expansion / contraction space of the structure. The functional elastic material according to claim 1 or 2, wherein the functional elastic material is composed of the foam and a pair of side plates bonded to a pair of surfaces of the foam. A functional stretchable material provided in the stretchable space of a structure.

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