JPH1025141A - Aggregate and damping concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively realize the damping performance in no need of a sophisticated structure by using hollow vessels containing particle bodies which are enclosed in the vessels so that the particles may be freely movable in the vessels as an aggregate to be admixed to a hardening material such as concrete. SOLUTION: The specific gravity of this aggregate is set to an almost same value as that of the hardening material and the aggregate is admixed to the hardening material to form a variety of structures. Even when these structures are exposed to vibrations due to earth-quakes, winds, traffics and the like, the particles in the vessels move to damp the vibration. An example of damping concrete according to this invention is given in the figure. The damping aggregate 2 is, for example, a flat sphere and is constituted with a hollow vessel 3 as an outer shell and a plurality of particle bodies 4 (for example, a metal with particle sizes of 1-0.1mm) enclosed in the vessel 3. The vessel 3 is made of metal, ceramic, hardened cement body, plastic resin and particularly a material having a high strength than that of the concrete main body is used in order to secure the high strength than that of the concrete main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aggregate and a damping concrete suitable for use as a material for constructing various structures and the like that require damping performance.

[0002]

2. Description of the Related Art In general, when various structures such as buildings require vibration damping performance, various types of vibration damping devices such as mass dampers, laminated rubber, sloshing dampers, etc. are installed, and the ground and structures are connected to each other. A structure in which insulation is provided by a vibration insulator such as a vibration-proof rubber or an air spring is used. Further, in sleepers and floor slabs used for railroad tracks, ballast and vibration-proof rubber are used as vibration dampers.

[0003]

However, the above-mentioned conventional techniques have the following problems.
First, in a structure in which a vibration damping device or a vibration insulator is incorporated to add a vibration damping function to a structure, there is a problem that the structure becomes complicated and effective use of space is hindered. In addition, the ballast and the vibration isolating rubber used for the sleepers and the floor slabs need to be periodically replaced, and there is a problem that maintenance is troublesome and costly. In addition, with the recent increase in speed of trains, it has become impossible to use ballasts.

[0004] In addition, it is conceivable that a material itself forming various structures or the like has a vibration damping function. In recent years, as a metal material, a laminated steel sheet, a vibration damping alloy, and the like have been developed as having a vibration damping function, but a concrete material having a vibration damping performance has not yet been developed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a low-cost vibration-damping performance without complicating the structure and hindering effective use of space. It is an object to provide an aggregate and a damping concrete which can be formed.

[0006]

The invention according to claim 1 is
Aggregate mixed into a hardening material such as concrete is characterized by comprising a hollow container forming an outer shell of the aggregate and a granular material movably sealed in the container.

According to a second aspect of the present invention, in the aggregate according to the first aspect, the specific gravity of the aggregate is set to be substantially equal to the specific gravity of the curable material into which the aggregate is mixed. And

The invention according to claim 3 is characterized in that an aggregate is mixed in concrete, and the aggregate is configured such that a granular material is movably sealed in a hollow container.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an aggregate and a damping concrete according to the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 1, various structures such as buildings requiring vibration damping performance, sleepers, floor slabs, and the like (hereinafter, simply referred to as “structure A”) constituting a railway track are made of damping concrete C. Is formed by The damping concrete C has a configuration in which a plurality of damping aggregates (aggregates) 2 are dispersed and mixed in a concrete body 1.

As shown in FIG. 1 and FIG.
Is a hollow container 3 having a flat spherical shape and forming an outer shell, for example.
And a plurality of granular materials 4, 4,... Enclosed in the container 3. The container 3 is made of, for example, metal, ceramics, hardened cement, plastic resin, or the like.
In particular, in order to secure the strength of the damping concrete C, it is preferable to use a material having a strength equal to or higher than that of the concrete body 1, such as a metal, a ceramic, or a hardened cement body. As shown in FIG. 2, the granular material 4 is, for example, a sphere having a diameter of about 1 mm to 0.1 mm, for example, a metal,
It is formed of ceramics, cement hardened material, and the like. These granular materials 4 are sealed in the container 3 in such an amount that the voids 5 are formed in the container 3, whereby the granular materials 4 are movable in the container 3.

The specific gravity of such a vibration damping aggregate 2 is set to be substantially equal to the specific gravity when the concrete body 1 is kneaded (in a state where water, cement and the like are mixed). As a result, the damping aggregate 2
During kneading, the damping aggregate 2 is prevented from floating or sinking and separating. In order to adjust the specific gravity of the damping aggregate 2, the material, thickness, etc. of the container 3 may be changed, but it is easy to change the amount of the granular material 4 sealed in the container 3. .

In the structure A formed by the damping concrete C, when an earthquake, a wind, or a vibration caused by passage of a railway or a car acts, the granular materials 4, 4,.
Move in the container 3 by inertial motion to cancel the vibration. More specifically, as shown in FIG. 3 (a), since these granular materials 4 are not fixed to the concrete body 1, they do not follow the movement of the structure A and continue to stand still or move by inertia. In addition, it may collide with other granular material 4 or the inner peripheral surface of the container 3,
As shown in FIG. 3B, friction occurs between the other granular material 4 and the inner peripheral surface of the container 3. The kinetic energy applied to the damping concrete C forming the structure A is partially converted into thermal energy due to the collision / friction between the granular materials 4 or between the granular materials 4 and the container 3. As a result, the amplitude of the vibration of the structure A is reduced, and the vibration is attenuated.

FIG. 4 shows the vibration damping concrete C
4A and 4B are graphs for comparing the damping state of acceleration when vibration is applied between (FIG. 4A) and conventional concrete that does not include the granular material 4 (FIG. 4B). As can be seen from these figures, in the damping concrete C, the vibration can be attenuated more quickly than in the past.

According to the above-described damping concrete C, the damping aggregate 2 is mixed in the concrete body 1, and the damping aggregate 2 is placed in the hollow container 3 in the granular material 4, 4, 4.
.. Are movably sealed. Thus, when vibration is applied to the structure A formed of the damping concrete C, the granular material 4 of the damping aggregate 2 vibrates in the container 3 with a phase difference from the vibration, so-called sloshing. The same effect as a damper can be exhibited to attenuate the vibration. In this way, by forming the structure A with the damping concrete C, it is possible to have the damping effect itself, and further reduce noise due to vibration. Therefore, a vibration damping effect can be added at a low cost with a simple structure without incorporating a vibration damping device or a vibration insulator as in the related art, and the effective use of space is not hindered. In addition, since it is not necessary to use ballasts and rubber dampers for railroad railroad sleepers and floor slabs, maintenance can be simplified and costs can be reduced. Can be. Furthermore, in the construction,
Since it is only necessary to knead the damping aggregate 2 having the granular material 4 in the concrete body 1, construction can be easily performed.

In the above embodiment, the shape of the container 3 of the damping aggregate 2 is not limited to a flat spherical shape, but may be other shapes such as a spherical shape, a cubic shape, and a rectangular parallelepiped shape. . Further, the shape of the granular material 4 is not limited to a spherical shape, but may be another shape such as an elliptical sphere, a cube, a rectangular parallelepiped, a polygon, or an irregular body. Of course, the size and the number of the container 3 and the granular material 4 are not limited at all, and may be appropriately set so as to exhibit a desired vibration damping effect. In order to further improve the vibration damping performance, a configuration in which a liquid such as water is sealed in the container 3 in addition to the granular material 4 may be adopted. Furthermore, in order to suppress the sound when the granular material 4 moves in the container 3, for example, rubber or the like may be provided on the inner peripheral surface of the container 3. Rubber may be attached to the inner peripheral surface for soundproofing.

Also, the damping aggregate 2 is added to the damping concrete C.
Not only that, but also a structure in which ordinary aggregate is mixed may be used.
Further, it goes without saying that the vibration damping concrete C can be applied not only to a mere concrete structure but also to a so-called reinforced concrete structure, a steel frame concrete structure, a steel frame reinforced concrete structure, a prestressed concrete, a post stressed concrete and the like.

Furthermore, in addition to the various structures such as the buildings mentioned above as the structures A formed of the above-mentioned damping concrete C, sleepers and floor slabs of railway tracks, for example, buildings near subways and railway station buildings. It can be suitably used also in a station building, an elevated road, and the like provided integrally.

[0018]

As described above, according to the aggregate according to the first aspect, the structure comprises the hollow container forming the outer shell and the granular material movably sealed in the container. I have.
When this aggregate is mixed with a hardening material such as concrete to form various structures, etc., when vibration due to earthquake, wind, traffic, etc. acts, the granular material moves in the container and the vibration Can be attenuated.

According to the aggregate according to the second aspect, the specific gravity of the aggregate is set to be substantially equal to the specific gravity of the curable material into which the aggregate is to be mixed. Thereby, when kneading the aggregate with the curable material, it is possible to prevent the aggregate from floating and sinking in the curable material and separating.

According to the third aspect of the present invention, the concrete has a structure in which an aggregate is mixed in the concrete, and the aggregate is formed by movably enclosing a granular material in a hollow container. I have. Accordingly, if various structures and the like are formed from the damping concrete, when vibrations due to earthquake, wind, traffic, etc. act, the granular material moves in the aggregate container to attenuate the vibrations. it can. Therefore, a vibration damping function can be added to various structures and the like formed of the vibration damping concrete, and noise due to vibration can be reduced. In addition, since the vibration damping device and the vibration insulator are not incorporated as in the related art, the above effects can be obtained with a simple structure and at low cost, and the effective use of space is not hindered. In addition, if damping concrete is used for sleepers and floor slabs of railway tracks, it is not necessary to use ballasts and vibration-proof rubber, so that maintenance can be simplified and the cost can be reduced. It can respond to high speed. Furthermore, at the time of the construction, it is only necessary to knead the aggregate having the granular material in the concrete, so that the construction can be easily performed.

[Brief description of the drawings]

FIG. 1 is an elevational sectional view showing an example of an aggregate and damping concrete according to the present invention.

FIG. 2 is an elevational sectional view showing the aggregate.

FIG. 3 is an elevational sectional view showing a state in which a granular material is moving in the aggregate.

FIG. 4 is a diagram comparing the damping state of vibration between the damping concrete according to the present invention and conventional concrete.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete body 2 Damping aggregate (aggregate) 3 Container 4 Granular body C Damping concrete

Claims (3)

[Claims] An aggregate mixed in a hardening material such as concrete comprises a hollow container forming an outer shell of the aggregate, and a granular material movably sealed in the container. Aggregate characterized. 2. The aggregate according to claim 1, wherein the specific gravity of said aggregate is set to be substantially equal to the specific gravity of said curable material into which said aggregate is to be mixed. 3. A vibration damping concrete, wherein an aggregate is mixed into concrete, and the aggregate is configured such that a granular material is movably sealed in a hollow container.