JPH04236497A - Manufacture of radio wave absorbing precast plate - Google Patents

Abstract

PURPOSE:To manufacture a radio wave absorbing precast plate for preventing damage of the end of a ferrite molded form and a leg piece of a decoration block engaged with the form with excellent radio wave absorption performance without generating an efflorescence. CONSTITUTION:Stretchable buffer materials 5, 6 are adhered to the end face of a decoration plate A of a ferrite molded form B opposite to a plurality of leg pieces 2 and the opposite ends of the adjacent forms 13, and the forms B are fitted between the pieces 2 filled with resin adhesive 4 for a decoration block A.

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 radio wave absorbing precast plate applied to a radio wave absorbing wall.

0002

BACKGROUND OF THE INVENTION In Japanese Patent Application Laid-Open No. 62-144398, the present applicant discloses a decorative block A in which a ferrite-based molded body B is fitted between a plurality of leg pieces b protruding from the back surface of a decorative board a. We proposed a radio wave absorbing wall made by integrally layering concrete C on the back. (See FIG. 6) In the figure, d is a reinforcing bar mesh, and e is a reinforcing bar.

[0003]The present applicant has proposed a radio wave absorbing precast board in which a ferrite molded body B is fitted between adjacent leg pieces b of the decorative board a, in Japanese Utility Model Publication No. 2-7515. We have proposed a radio wave absorbing precast board in which the gap between the body B and the decorative block A is watertightly filled with a resin adhesive f to prevent water from entering the gap and reducing the radio wave absorption performance. (See Figure 7) Also, the applicant has
- In Publication No. 7516, a radio wave absorbing precast board is disclosed in which an elastic cushioning material g is attached to the end face of the ferrite molded body B opposite to the leg b to prevent breakage of the ferrite molded body B and the leg b. proposed. (See Figure 8)

0
004]

[Problems to be Solved by the Invention] However, in the radio wave absorbing precast board, there is no consideration given to the expansion and contraction of the ferrite molded body itself on the end surface of the ferrite molded body that does not face the leg piece of the decorative block.
When the decorative block and the ferrite molded body have different coefficients of thermal expansion, particularly when the ferrite molded body has a large coefficient of thermal expansion, a pressing force acts on the opposing end surfaces of adjacent molded bodies. As a result, the end faces of the molded body are damaged, and water enters between the end faces of the molded body, impeding the radio wave absorption performance.
In addition, a chemical reaction occurs between rainwater and concrete, and the surface of the decorative board becomes stained by efflorescence. A similar problem also occurs when the end surfaces of the ferrite-based molded body come into contact with concrete at locations such as expansion joints.

[0005] The present invention was proposed in view of the problems of the prior art described above, and its purpose is to have excellent radio wave absorption performance and to avoid causing efflorescence.
An object of the present invention is to provide a method for manufacturing a radio wave absorbing precast board in which damage to the end face of a ferrite molded body and the leg pieces of a decorative block is prevented.

[0006]

[Means for Solving the Problems] In order to achieve the above object, according to the method for manufacturing a radio wave absorbing precast board according to the present invention, an end face of the ferrite molded body facing the plurality of leg pieces of the decorative board is provided. At the same time, an elastic cushioning material is attached between the opposing end surfaces of the adjacent ferrite-based molded bodies, and the ferrite-based molded bodies are attached to the decorative material filled with a resin adhesive. It fits between the legs of the block.

[0007]

[Function] According to the present invention, as described above, an elastic cushioning material is attached to the end face of the decorative board of the ferrite molded body facing the leg piece and to the opposite end face of the adjacent ferrite molded body, and By fitting the ferrite molded body between the legs of a decorative block filled with a resin adhesive, the resin adhesive is filled between the molded body and the back surface of the decorative board to form a decorative block. The stretchable cushioning material prevents breakage of the leg pieces of the decorative board and damage to the end face of the ferrite molded body opposite to the leg piece and the opposite end face of the adjacent ferrite molded body, and further The resin adhesive can prevent it from penetrating into the gap between the decorative board and the ferrite molded body.

[0008]

[Example] Fig. 1 shows the manufacturing process of a radio wave absorbing precast board according to the present invention. Rubber mold mats Q for driving decorative board A are laid out on a formwork base P, and a plurality of A decorative block A with protruding leg pieces 2 is fitted onto the mold mat Q, a weight R is loaded to prevent floating, and high fluidity is applied to the gap between the decorative boards 1 of adjacent decorative blocks A. The mortar 3 is poured, and after the mortar 3 has hardened, the weight R is removed.

[0009] Next, a resin adhesive 4 having waterproof and adhesive properties is applied between the leg pieces 2 and 2 on the back side of the decorative board 1 of the decorative block A, and a resin adhesive 4 having waterproof and adhesive properties is applied onto the adhesive 4, facing the leg piece 2. A ferrite-based molded body B having stretchable cushioning materials 5 and 6 such as butyl rubber affixed to the end face of the molded body B, and an end face perpendicular to the same end face, respectively, is fitted and arranged, and a weight R is loaded on the molded body B. Make sure that it is in close contact with the decorative block A, and then press the weight R.
is removed, a reinforcing bar mesh 7 which also serves as a radio wave reflector is stretched between the leg pieces 2, 2, and embedded hardware is attached to manufacture a radio wave absorbing precast board.

FIG. 3 shows a radio wave absorbing precast board manufactured as described above. The radio wave precast board has decorative boards fitted with ferrite molded bodies arranged vertically and horizontally on the wall surface, and a reinforcing mesh 7 on the back surface. Then, reinforcing reinforcing bars 8 are arranged and wall concrete 9 is cast, and the concrete 9 is integrated with the decorative board to construct a radio wave absorbing precast board.

[0011]

Effects of the Invention According to the present invention, as described above, the resin adhesive filled between the back surface of the decorative board and the ferrite molded product reduces the radio wave absorption performance caused by water intrusion into the back surface of the molded product. By attaching an elastic cushioning material to the end face opposite to the leg piece of the decorative board of the ferrite molded body, breakage of the leg piece and the molded body is prevented, and furthermore, the adjacent molded body By arranging an elastic cushioning material on the opposing end faces of the molded body, it is possible to reduce the pressing force acting on the end faces of the molded bodies and between the concrete and the end face of the molded body at locations such as expansion joints, thereby preventing defects on the end faces of the molded body. It is possible to produce a radio wave absorbing precast board that prevents water from entering between the end faces of the molded body or between the molded body and concrete, and prevents a decrease in radio wave absorption performance and an efflorescence phenomenon. It is something.

[Brief explanation of the drawing]

FIG. 1 is a process explanatory diagram of an embodiment of a method for manufacturing a radio wave absorbing precast plate according to the present invention.

FIG. 2 is a perspective view of a decorative board fitted with a ferrite-based molded body according to the present invention.

FIG. 3 is a longitudinal sectional front view of a radio wave absorbing precast board manufactured by the method of the present invention.

FIG. 4 is a longitudinal sectional side view of the radio wave absorbing precast board.

FIG. 5 is a partially cutaway front view of the radio wave absorbing precast plate.

FIG. 6 is a longitudinal cross-sectional view showing an example of a conventional radio wave absorbing precast board.

FIG. 7 is a longitudinal sectional view showing another example of a conventional radio wave absorbing precast board.

FIG. 8 is a longitudinal sectional view showing still another example of a conventional radio wave absorbing precast board.

[Explanation of symbols]

A. Cosmetic block B Ferrite molded body 1 Decorative board 2 Leg pieces 4 Resin adhesive 5. Elastic cushioning material 6. Elastic cushioning material 7 Reinforcement mesh

Claims (1)

[Claims] [Claim 1] Wall concrete is integrally layered on the back side of a decorative block in which a plurality of leg pieces are protruded from the back side of the decorative board, and a ferrite-based molded body is fitted between adjacent leg pieces. In the method for producing a radio wave absorbing precast board, an elastic cushioning material is attached to an end surface of the ferrite molded body facing the plurality of legs of the decorative board, and the adjacent ferrite molded bodies are A method for producing a radio wave absorbing precast board, comprising: adhering an elastic cushioning material between the end faces, and fitting the ferrite molded body between the legs of the decorative block filled with a resin adhesive. .