JP2003184011A - Paving concrete block and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paving concrete block for a low priced visually handicapped person leading system without impairing any beauty by paving blocks on a sidewalk or a platform of a railway station. <P>SOLUTION: The paving concrete block is formed by combining a magnetic layer 1A forming a surface layer with a concrete layer 1B forming a lower layer. The magnetic layer 1A is a molded body hardening a mixture of a granulated magnetizing oxide containing slag, cement and water, and it contains 15 to 95 wt.% of the magnetizing oxide containing slag. The magnetizing oxide containing slag comprises granulation having grain size not more than 5 mm, and the slag more than 90 wt.% is contained in a range of grain size of 0.15 mm to 5 mm. By the constitution, when the front end of a magnetic sensor built-in white stick carried by the visually handicapped person comes into contact with the magnetic layer 1A forming the surface layer, a vibrator incorporated into the white stick can be vibrated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete block for paving, and more particularly to paving for guiding visually impaired persons laid on sidewalks (intersections) or station platforms so that visually impaired persons can safely walk outdoors. Regarding concrete blocks.

[0002]

2. Description of the Related Art In recent years, the social environment for persons with disabilities such as barrier-free has been improved. For example, as a method for assisting visually impaired people to walk, it is generally widely practiced to lay a block having a linear or point-like projection on the surface thereof at a platform or an intersection of a station. According to this
Although it is possible to guide or warn the visually impaired by the protrusion on the block surface, in recent years it has been further advanced to incorporate a vibrator and a magnetic sensor into the white cane carried by the visually impaired, while a magnetic substance that can be detected by the magnetic sensor. A visually impaired guidance system has been put into practical use in which a vibrator is activated when the magnetic substance is fixed to a block and the magnetic substance is detected by a magnetic sensor in the cane.

[0003]

However, many of the conventional blocks used in the visually impaired guidance system as described above have a drawback that the cost is high because the block body is made of ceramic tiles. .

Even if the block body is made of an inexpensive concrete material, if ferrite powder is used as a magnetic material to be fixed to the block material, the price per unit area becomes very high, and the ferrite powder turns the entire block black. There was a problem that it spoiled the aesthetics because it was lost.
The block of that type may be colored with a cement colorant, but in the case of using ferrite powder, the fine particles appear on the surface, so the desired color tone cannot be obtained and the surface becomes dark. There is a drawback that it ends up.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an inexpensive concrete block for paving for a visually impaired guidance system which is laid on a platform of a sidewalk or a station and does not spoil the appearance. To provide.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention provides a concrete block for paving, which comprises molding a mixture of granular magnetic oxide-containing slag, cement and water into a predetermined shape and solidifying the mixture. It is characterized by consisting of.

[0007] A concrete block for paving, wherein a magnetic layer forming a surface layer portion and a concrete layer forming a lower layer portion are integrated, wherein the magnetic layer comprises 15 to 95 weight parts of a granular magnetic oxide-containing slag. % Is included.

In the concrete block for paving as described above, the magnetic oxide-containing slag is granular with a particle size of 5 mm or less, 90% by weight or more of which is 0.15 mm to 5 mm.
It is characterized by being included in the particle size range of.

Further, the magnetic oxide-containing slag is characterized in that it contains calcium oxide, silicon oxide, manganese oxide, aluminum oxide, and magnesium oxide in addition to iron oxide.

On the other hand, as a method for producing the concrete block for paving as described above, a granular magnetic oxide-containing slag is mixed with cement and water, and the mixture is filled into a mold and molded, and thereafter, It is characterized in that the molded product is removed from the mold and solidified, or it is solidified without being removed from the mold.

Further, green concrete is put in a mold, and a mixture of granular magnetic oxide-containing slag, cement and water is filled on the mold and molded, and then the molded product is removed from the mold and solidified. Or to solidify without removing from the mold.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, application examples of the present invention will be described in detail with reference to the drawings. 1 is a perspective view showing a concrete block for paving as a preferred embodiment of the present invention, FIG. 2 is a plan view of the block, FIG. 3 is a side view of the block, and FIG. An X-ray cross section is shown.

In these figures, reference numeral 1 denotes a rectangular block main body, on the surface of which projections 2, ... Are formed at predetermined intervals in the vertical and horizontal directions. In this example, the block body 1 has a length and width of about 300 mm and a thickness of 60 mm to 80 mm.
The protrusion 3 for adjusting the joint width is integrally formed on the side surface thereof. The protrusion 2 has a diameter of 10 mm to 25 mm and a height of about 5 mm.
The frusto-conical shape of mm is formed integrally with the block body 1.

In particular, as is apparent from FIG. 4, the block body 1 has a two-layer structure in which the magnetic layer 1A forming the surface layer portion and the concrete layer 1B forming the lower layer portion are integrated. Among them, the concrete layer 1B is a solid of concrete, more specifically, cement concrete, and the component thereof is cement and aggregate such as sand and gravel. In some cases, fly ash, AE agent, and the like are included therein.

On the other hand, the magnetic layer 1A is made of concrete containing granular magnetic oxide-containing slag. Specifically, a mixture of a magnetic oxide-containing slag and cement and water is molded into a predetermined shape and solidified, but in this example, in addition to the cement colorant, an aggregate such as sand or gravel, and Admixtures such as AE agents and water reducing agents are added.

In particular, the magnetic layer 1A comprises 15 to 95% by weight, preferably 40 to 80% by weight, of the magnetic oxide-containing slag, and the layer thickness is 5 to 50% of the total, in this example 3 to 3. It is set to 40 mm. If the amount of the slag containing a magnetic oxide exceeds the above range, it is difficult to fix with cement as a binder, and if the amount of the slag is less than the above range, sufficient magnetic properties cannot be obtained and the visually impaired There is a possibility that the magnetic sensor built into the well-known white cane that cannot be detected may be unable to be detected.

Here, the magnetic oxide-containing slag is a solidified body of oxide obtained by quenching a melt discharged from iron scrap or quick lime as a main raw material and from a metal refining process. As shown in Table 1 below, its composition is mainly composed of calcium oxide (CaO) and silicon oxide (SiO 2).
₂ ), iron oxide (FeO), manganese oxide (MnO), aluminum oxide (Al ₂ O ₃ ), and magnesium oxide (Mg
O) is included. The iron content in the magnetic oxide-containing slag does not rust because it exists as iron oxide combined with oxygen.

[0018]

[Table 1]

Further, the magnetic oxide-containing slag in this example is in the form of granules (granules) having a particle size distribution as shown in Table 2 below. The particle size is 5 mm or less, which is 9
0% by weight or more is included in the particle size range of 0.15 mm to 5 mm.

[0020]

[Table 2]

As is clear from Table 2 above, in this example, 60 to 82% by weight of the magnetic oxide-containing slag is 0.6.
It is included in the particle size range of mm to 3 mm. It should be noted that with a slag containing a magnetic oxide having a particle size of 5 mm or more, it is not possible to disperse this satisfactorily, and it becomes difficult to make the magnetic layer 1A thin, while fine particles of 0.15 mm or less are mostly dispersed. If the powdery magnetic oxide-containing slag that occupies is used, the coloring by the pigment is adversely affected and the desired color tone cannot be obtained.

Here, the manufacturing method of the concrete block for paving as described above will be described with reference to FIG. 5, where 4 is a bottom plate and 5 is a formwork placed on the bottom plate. First, an appropriate amount of zero slump green concrete C is put in the frame 5, and the green concrete C is compacted by applying pressure from above while applying vibration to the frame 5.

Next, on the green concrete C, the same form 5
The above-mentioned granular magnetic oxide-containing slag and cement and water, or a mixture M obtained by adding a yellow inorganic pigment as well as an aggregate and an admixture thereto, is filled therein, and the form 5 is vibrated as described above. At the same time, pressure molding is performed by the pressing force applied from above by the upper mold 6.

After that, the molded product in which the fresh concrete C and the mixture M are integrated is removed from the mold 5 and allowed to solidify by leaving it for a certain period of time to obtain a concrete block for paving as shown in FIG. You can The magnetic oxide-containing slag is preferably magnetized before use, so that the magnetic sensing function can be improved.

[0025]

EXAMPLES Fresh concrete C was put into a rectangular form 5 having a length and width of about 300 mm and pressed from above to form a concrete layer 1B having a thickness of about 50 mm. Next, Table 2
70 containing magnetic oxide having a particle size distribution such as
A mixture M in which 1 part by weight of cement, 24 parts by weight of cement, 5 parts by weight of water, and 1 part by weight of yellow pigment are kneaded is placed in the same mold 5 and is pressed from above by the upper mold 6 onto the concrete layer 1B. A magnetic layer 1A having a thickness of about 10 mm was integrally formed. Then, the molded product was solidified to obtain a concrete block for paving as shown in FIG.

According to the concrete block for paving as described above, the surface of the concrete block has a clear yellow color and is laid on the platform of a station or an intersection so as not to spoil the aesthetic appearance. When the tip of a sensor built-in white cane comes into contact, a vibrator installed in the white cane is activated via the magnetic sensor, and the grip portion of the white cane vibrates to detect a danger. .

Although the application example of the present invention has been described above, as the concrete block for paving, the block body 1 may have a single layer structure of the magnetic layer 1A as shown in FIG. According to this, it suffices to mold a mixture of the slag containing a magnetic oxide, cement and water into a predetermined shape and solidify it. Also in this example, it is preferable that the magnetic oxide-containing slag has the above composition and the content thereof is 15 to 95% by weight of the entire magnetic layer 1A, and the particle size is 5 mm or less. 90% or more of which is 0.15
It is desirable to be included in the particle size range of mm to 5 mm. Then, the magnetic oxide-containing slag of that kind is mixed with cement and water, and after the mixture is put into a mold and vibrated and pressurized to be molded, the molded product is removed from the mold and solidified. Thus, the concrete block for paving as shown in FIG. 6 can be obtained.

Here, the concrete block for paving is not limited to the form as shown in FIG. 1, but the surface may be flat without the protrusions 2 or a band-like protrusion as shown in FIG. 7 instead of the circular protrusions 2. 2'may be formed.

[0029]

As is clear from the above description, since the concrete block for paving according to the present invention is made of cement concrete containing a slag containing a magnetic oxide, it can be manufactured with high strength and at a low cost, and it is magnetic. Since the granular magnetic oxide-containing slag is used as the body, it can be colored in a desired color tone, and its laying does not spoil the appearance.

In particular, the magnetic oxide-containing slag of this example is
It is a by-product discharged from the metal refining process that reuses iron scrap and can be effectively used.

The magnetic oxide-containing slag is granular with a particle size of 5 mm or less, 90% by weight or more of which is 0.15 mm to 5 mm.
Since it is included in the particle size range of mm, it is possible to further improve the coloring property.

[Brief description of drawings]

FIG. 1 is a perspective external view showing a concrete block for paving according to the present invention.

FIG. 2 is a plan view of the block.

FIG. 3 is a side view of the block.

FIG. 4 is a sectional view taken along line XX in FIG.

FIG. 5 is an explanatory view showing an example of manufacturing such a concrete block for paving.

FIG. 6 is a sectional view showing another embodiment of the concrete block for paving according to the present invention.

FIG. 7 is a perspective external view showing a modified example of the concrete block for paving according to the present invention.

[Explanation of symbols]

1 block body 1A magnetic layer 1B concrete layer 2 protrusions 3 ridges 5 formwork

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) E01F 9/06 E01F 9/06 F term (reference) 2D051 AA07 AA08 AB03 AD05 AE05 AE06 AF03 AF05 AF09 AF11 AF12 AF13 AF14 AH02 DA11 DA18 DC01 DC09 2D064 AA04 AA22 AA24 BA11 CA04 CA06 EA12 EA15 4G012 PA29

Claims (6)

[Claims] 1. A concrete block for paving, which is obtained by molding a mixture of granular slag containing a magnetic oxide, cement and water into a predetermined shape and solidifying the mixture. 2. A pavement concrete block in which a magnetic layer forming a surface layer and a concrete layer forming a lower layer are integrated with each other, and the magnetic layer contains 15 to 95 parts by weight of a granular magnetic oxide-containing slag. A concrete block for paving, which is characterized by containing%. 3. A slag containing a magnetic oxide is granular with a particle size of 5 mm or less, 90% by weight or more of which is 0.15 mm to 5 mm.
The pavement concrete block according to claim 1 or 2, wherein the concrete block is included in the particle size range. 4. The concrete block for pavement according to claim 1, 2 or 3, wherein the magnetic oxide-containing slag contains iron oxide, calcium oxide, silicon oxide, manganese oxide, aluminum oxide, and magnesium oxide. . 5. A granular magnetic oxide-containing slag is mixed with cement and water, the mixture is filled into a mold and molded, and then the molded product is removed from the mold and solidified, or A method for producing a concrete block for paving, which comprises solidifying without removing from the frame. 6. A green concrete is put into a mold, and a mixture of granular slag containing a magnetic oxide, cement and water is filled on the mold to be molded, and then the molded product is removed from the mold and solidified. A method for manufacturing a concrete block for pavement, which is characterized in that it is solidified without being removed from the formwork.