JP2001354469A - Production process of porous, sound-absorbing and vibration-damping block and method for using the block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a porous, sound-absorbing and vibration-damping block produced by using, as its main raw materials, water granulated iron-blast-furnace slag and glass cullet. SOLUTION: This method for using the above block, comprises: further combining this block having a 30 mm thickness with soft butyl rubber having a 3 mm thickness to form a combined block used as a sound-absorbing and vibration-damping block; or placing this block (described in PURPOSE) having a 100 mm thickness in the vicinity of a railway slab track (solid bed track) as a measure to counter noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a porous sound absorbing / damping block using recycled glass cullet made of waste glass such as granulated slag and glass bottles generated in a blast furnace of an ironworks, and its production method. How to use.

[0002]

2. Description of the Related Art Conventionally, porous sound absorbing / damping blocks made mainly of granulated slag and recycled glass cullet of waste glass have not been manufactured because there is no manufacturing technology for solidifying the blocks without damaging their porosity. Absent. Further, as a method of use, there is no material having a sufficient vibration damping function for a thick plate. Further, there is no soundproofing method by laying a porous sound-absorbing material on a railroad track surface.

[0003]

Sound absorption is the conversion of air into heat energy by compression and expansion of air in gaps inside the material due to the internal incidence of sound waves on the material. Conventionally, among the materials mainly used as sound absorbing materials, those mainly made of soft fibers such as glass wool and rock wool are used. Therefore, the development of a hard rigid sound absorbing material having high rigidity has been urgently required due to its convenience in use.

[0004] In this case, first, a rigid rigid block-shaped sound absorbing material is required as a constraining layer which is a part of a vibration damping material having a sound absorbing effect. ) When laying on the track surface, a rigid block-like sound absorbing material with high rigidity is required.
It is.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the sound-absorbing material of the present invention is designed so as not to impair the porosity of the recycled glass cullet made of granulated slag and waste glass as raw materials. The biggest point is solidification.

When an ordinary concrete block is molded in a normal operation using a molding apparatus, the physical properties are high and the specific gravity is high, so that the sound absorbing effect is low. Therefore, this shaping is performed in about half the normal vibration time (about 15 seconds).

[0007] The constituent material is also a major factor in the sound absorbing performance. In comparison data of reverberation room method sound absorption coefficient test by Tokyo Metropolitan Industrial Technology Research Institute and Measurement Application Technology Group (refer to the attached “Contract Business Report”), the difference between Z2 and Z5, where the difference is remarkable, is It becomes clear. (Sample thickness 5
(Comparison at 0 mm)

The constituent material in Z2 is slag size 1
64% by weight 3mm, glass cullet crushed, size 4% by weight 0.3-1.2mm, cement weight 18
%, 7% by weight of water. On the other hand, the constituent material in Z5 has a slag size of 2.5 to 3.0 mm and a weight ratio of 23%,
Crushed glass cullet, size 4.0 mm or less, weight ratio 46
%, 23% by weight of cement and 8% by weight of water.

Here, as a simple comparison, the weight of a block having a size of 50 mm × 390 mm × 190 mm is:
The fact that Z2 is $ 6.4 kilograms and Z5 is $ 4.0 kilograms means that the sound absorbing property is reduced due to the increased density, as well as the porosity of the material. Therefore, it can be said that a material having high sound absorption performance is lightweight. From the data, it can be proved that Z5 is a solid using the raw material and having the maximum sound absorbing performance.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventionally, a sheet-like vibration damping material obtained by mixing carbon or the like in rubber has not been sufficiently effective in damping a thick substrate. Theoretically, it is said that a rubber sheet-shaped damping material cannot achieve a sufficient effect unless a material having a thickness three times that of the rubber sheet is attached to the substrate.

Therefore, a block thickness of 30 mm solidified by the above method is bonded to a soft butyl rubber thickness of 3 mm by bonding to a block thickness of 30 mm, and the loss coefficient for a steel plate thickness of 9 mm (substrate) is measured as a sound absorbing vibration-damping block. did. (Refer to the attached “Academic Report”) Looking at this report, at least 1 / 100th
The loss coefficient changed until then, and a very high damping effect was observed.

[0012] The inner wall of the engine room of the ship has a thickness of 8 mm.
Steel plates of millimeters or more are often used. By affixing the sound absorbing / damping block of the present invention to the inner wall of the steel plate, noise caused by vibration can be reduced, and the sound absorbing effect reduces the sound pressure inside the engine room. It also enables noise control.

In the above, it is possible to provide a vibration-damping and sound-absorbing effect at a time, which contributes to a reduction in man-hours, as compared with a case where a conventional vibration damping material is applied and a sound absorbing material is applied. It also has secondary implications.

Further, the present invention provides a solid-state sound absorbing material.
It is possible to absorb sound on the railway track surface.

[0015] In recent years, the speeding up and shortening of the operation intervals of railway vehicles have been promoted in order to improve the transportation volume, and along with that, the noise problem in the vicinity of railway lines has become apparent. At present, countermeasures using sound barriers are predominant. In this case, the height has a great effect on the sound insulation performance, but there are also problems such as the right to sunshine, and the limit has been reached.

In particular, in recent years, slab tracks (directly connected tracks) in which rails are directly fixed to concrete are progressing in place of conventional ballast tracks laid with crushed stones in order to be maintenance-free. This track has a drawback that it reflects the rolling noise of a railway vehicle (referring to the friction noise between wheels and rails generated at the lower part of the vehicle) because the surface is made of concrete and the density is high. It is the source of the problem.

Therefore, the sound absorbing block of the present invention having a thickness of 100 mm is laid between the rails on the railroad track and between the rails and near the outside of the rails, so that sound is absorbed at a very close position, and around the track surface. 3 to 5 decibels can be reduced. This has the same meaning as two to three times apart.

[0018]

Since the present invention is configured as described above, it has the following effects.

Since the main raw materials are granulated slag and glass cullet, which are porous materials, the solidified block without losing its porosity has high rigidity and high sound absorption. I have.

By combining the thickness of the sound absorbing block of 30 mm with the thickness of the soft butyl rubber of 3 mm, the block can be used as a sound absorbing / damping block having high vibration damping performance even for a thick substrate.

The sound absorbing block having a thickness of 100 mm is mainly used in a railway slab track (directly connected track) in the vicinity of a track surface to absorb sound and take noise countermeasures.

Granulated slag, which is a raw material, is a material generated in a steel production process, and the treatment of blast furnace slag is a concern for each blast furnace manufacturer. In addition, glass cullet is a recycled product that is baked and generated from waste glass such as bottles, but the use of this has not been developed, and the present invention shows a certain direction for these uses. It is. In a social trend that promotes the reuse of resources in recent years, this is a very significant invention that focuses on environmental protection,
This is a revolutionary measure for improving the noise environment.

[Brief description of the drawings]

FIG. 1 is a structural view of a vibration damping / sound absorbing block (attached to a substrate).

[Explanation of symbols]

 Reference Signs List 1 sound absorbing block thickness 30 mm 2 adhesive layer 3 soft butyl rubber thickness 3 mm 4 substrate

FIG. 2 is a state (overhead view) in which a vibration damping / sound absorbing block is laid on a railway slab track.

[Explanation of symbols]

 5 Rail 6 Sound absorption / damping block thickness 100 mm 7 Concrete slab

FIG. 3 shows a state (cross section) in which a damping / sound absorbing block is laid on a railway slab track.

FIG. 4 is an enlarged photograph of the structure of the granulated raw material slag. Granulated slag is a porous, angularly shaped structure that is generated when crude steel is produced from a blast furnace. Therefore, it has lightweight properties, which are important properties in soil engineering, and large shear resistance.

FIG. 5 is an enlarged photograph of the structure of a raw material glass cullet.
The glass cullet is obtained by pulverizing used colored glass or window glass to form a completely inorganic fired body.

[Test report] Reverberation room method sound absorption test ("Contracted business report", page 15) and loss coefficient test test report ("Report", page 1) ).

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Claims (4)

[Claims] 1. Recycled glass cullet made of waste glass such as granulated slag and glass bottles generated in a blast furnace of a steelworks as a main raw material, mixed with cement and water, and solidified without impairing its porosity. Damping block. 2. A method for producing a sound-absorbing and vibration-damping block comprising granulated slag and glass cullet as main raw materials, mixed with cement and water, and solidified without impairing its porosity. 3. A method of using a block mainly composed of granulated slag and glass cullet and soft butyl rubber as a porous sound absorbing / damping block for a vibrating substrate. 4. A method of using a block made of granulated slag and glass cullet as a main raw material on a railway slab track (directly connected track) track surface as a porous sound absorbing / damping block to reduce noise.