JPS62276109A - Road block - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a road block, and particularly to a road block suitable for guiding visually impaired people.

[Conventional technology]

So-called Braille blocks for the purpose of guiding, guiding or warning visually impaired people when walking are widely used on sidewalks, crosswalks, station platforms, stairs, etc. These Braille blocks are made of concrete blocks with ridges of various shapes on the surface, and by laying them in a fixed arrangement on the walking surface, the ridges of the blocks can be sensed with the tip of a cane carried by a visually impaired person, or This is sensed by the feel of the footwear. According to the Braille blocks, it is possible to clearly distinguish between the Braille blocks placed on one walking surface and other flat blocks based on the difference in surface shape.

On the other hand, a ferrite Braille block has a magnetic material layer mixed with ferrite particles inside the block, and a magnetic sensor built into the tip of a cane owned by a visually impaired person detects the presence or absence of magnetic material and guides walking. Developed (1986)
No. 59319, name of the invention: "Magnetic sign and Braille block for visually impaired people"). The content of this invention is to attach a magnetic mark to a conventional colored uneven Braille block, and to use both detection of the uneven shape and magnetic detection.

[Problem that the invention seeks to solve]

However, since the conventional ferrite Braille blocks used fine magnetite powder, the following problems remained. That is, since magnetite is a fine powder, it is not possible to hide the color, and in order to freely color the block surface, a multilayer structure has been required.

The purpose of the present invention is to create a road block made by colored granulation of ferrite powder, which has a high strength regardless of whether it has a single layer or multilayer structure, and which can freely express the color on the surface by mixing pigments into the matrix material. Our goal is to provide the following.

[Means for solving problems]

The present invention is a road block characterized in that a magnetic sensing sign is formed by mixing colored, granulated ferrite particles, which also serve as aggregate, into a matrix material containing a pigment.

In the present invention, matrix materials include thermosetting resins such as epoxy resins, urethane resins, and unsaturated polyester resins, thermoplastic resins such as polypropylene resins and ABS resins, rubbers such as SBR and NBR, or blocks such as cement and concrete. Refers to the base material that makes up the main body.

〔Example〕

Examples of the present invention are shown below.

(1) Production of white granulated ferrite particles Add 3.15 kg of ferrite powder with a particle diameter of - to an omni mixer (manufactured by Chiyoda Giken ■), and add 0.225 kg of white cement.
kg and 0.320 kg of water were added and kneaded for about 10 minutes.

Next, 0.662 kg of white cement, 165 kg of white pigment (titanium oxide) O, and 0.347 kg of water were added and kneaded and granulated for about 10 minutes.

After curing for one week, the mixture was classified using a vibrating sieve (manufactured by Kenei Sangyo ■) equipped with a 2.5 m mesh to obtain white granulated ferrite particles.

The particle size distribution is as shown in Table 1.

Table 1 (2) Production of sintered ferrite particles A small amount of PVA solution was added to the same ferrite powder as in (1), and after kneading in a ball mill for 6 hours, a tablet-shaped molded product was made at a high pressure of 5 t/aJ. 12 in silicone furnace
After the temperature reached 1,200° C. for 8 hours, sintering was carried out at that temperature for 8 hours.

After cooling, it was crushed and classified in the same manner as in (1) to obtain sintered ferrite particles.

The particle size distribution is as shown in Table 2.

Table 2 Particle size distribution of sintered ferrite particles (3) Interlocking block manufacturing method (1)
) were mixed with silica sand, white cement, water, and green pigment in the proportions shown in Table 3, and then interlocked using a time-demolding molding machine (manufactured by Chiyoda Giken Koku). Create a block (unisystem),
After curing for 3 weeks, the color difference was tested.

At the same time, as comparative examples, one containing no ferrite (blank) (Comparative Example 1) and one containing sintered ferrite particles obtained by the treatment in (2) above (Comparative Example 2.31) containing ferrite powder without granulation. Things (Comparative Examples 4 and 5)
For each, the same materials as in the examples were mixed in the proportions shown in Table 3 to create interlocking blocks (Unisystem) in the same manner, and the color differences were compared with those in the examples.

The test results are also shown in Table 3.

As is clear from Table 3, according to the present invention, Comparative Examples 2 to
Although the amount of ferrite added was about twice that of Sample No. 5, the brightness was almost the same as that of the blank (comparative example), and the decrease in color difference was slight compared to the blank.

(Margins below) Table 3: Material formulation and product characteristics in interlocking block trial production experiments Color difference: L = Lightness (white [baseline 0100 ~ black [baseline ω0
) a = hue, b = saturation, ΔF = color difference ΔF = '- ΔL2 + Δa2 + Δb2 In addition, in the molded article according to the present invention, colored granulated ferrite particles act as an aggregate, and as is clear from Table 3, fine powder ferrite is It can be seen that the density and compressive strength are increased compared to the mixed molded body.

〔Effect of the invention〕

As described above, according to the present invention, ferrite particles colored and granulated in the same color as the structure of the molded body, including white, are mixed in and the colored surface layer is not specially used. A planar magnetic sensing label can be provided.

Furthermore, since ferrite is mixed as an aggregate in accordance with the present invention, the surface wear resistance of the formed body structure, for example, concrete structure, is not reduced, and it has the effect that it can be laid and used by the same handling as general road blocks. .

Claims (1)

[Claims] (1) A road block characterized in that a magnetic sensing sign is formed by mixing colored, granulated ferrite particles, which also serve as aggregate, into a matrix material containing a pigment.