JPH04350242A - Fiber-reinforced roofing tile - Google Patents

Abstract

PURPOSE:To increase the elastic limit strength and breaking strength by dispersing a fiber material more on the back side of a roofing tile than on the surface side of the roofing tile in the fiber-reinforced roofing tile dispersed and reinforced with the fiber material inside. CONSTITUTION:A fiber material is dispersed more on the back side of a roofing tile than on the surface side of the roofing tile in the fiber-reinforced roofing tile dispersed with the fiber material such as natural fibers and synthetic fibers inside to reinforce strength. The elastic limit strength and breaking strength against the tensile stress concentrated on the back face when force is applied from the surface of the roofing tile are increased. Even if a heavy object is mounted on the roofing tiles during transportation or a person rides on the installed roofing tiles, the breakage of the roofing tiles can be prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to roof tiles reinforced with natural fibers or synthetic fibers dispersed therein.

0002

[Prior Art] Nowadays, pure Japanese architecture is becoming rarer, and slate tiles are becoming mainstream instead of Japanese tiles. This slate tile is mainly made of cement,
It is manufactured by putting an inorganic composition obtained by shaking aggregate and water into a mold and press-molding it under high pressure, or by extrusion molding, but with only cement and aggregate, the bending strength etc. Therefore, in general, in addition to the above-mentioned inorganic composition, synthetic fibers and natural fibers are mixed uniformly, and the tiles are reinforced with these fibers.

0003

[Problems to be Solved by the Invention] However, the above-mentioned conventional tiles containing reinforcing fibers have the following problems. That is, force is usually applied to tiles from the front surface to the back surface. When such a force is applied, the stress is first concentrated on the back side, causing a crack to develop and propagate. Therefore, with conventional tiles in which reinforcing fibers are evenly distributed, it is difficult to prevent the initiation of destructive cracks on the back side of the tile. This was something that could not be adequately planned.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a tile that can sufficiently prevent the initiation of destructive cracks on the back side of the tile.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fiber-reinforced roof tile in which a fiber material is dispersed and reinforced inside, in which the fiber material is reinforced on the surface side of the roof tile. The gist is a tile that is characterized by a fiber-reinforced tile that is mostly dispersed on the back side of the tile.

[0006]

[Function] According to the above structure, when a force is applied from the front side of the tile, tensile stress is concentrated on the back side, but the reinforcing fibers are mostly dispersed on the back side and counteract this tensile stress.
The initiation of initial destructive cracks can be prevented.

[0007]

[Example] Fiber materials include, but are not particularly limited to, organic fibers such as vinylon fibers, polyester fibers, polyethylene fibers, polypropylene fibers, aramid fibers, and inorganic fibers such as alkali-resistant glass fibers and carbon fibers. . In addition, the fiber length and fiber diameter of the fiber material are not particularly limited, but the fiber length is about 5 to 10 mm,
It is preferable that the fiber diameter is about 10 to 20 μm.

[0008] The cement and aggregate are not particularly limited, and any known materials used in the production of conventional slate roof tiles can be used. The tiles according to the present invention are not particularly limited, but include:
For example, first, a composition (A) is prepared by shaking and mixing cement, aggregate, reinforcing fibers, and water in a normal mixing ratio, and a composition (A
A composition (B) is prepared in which reinforcing fibers are mixed in an amount of 1 to 5 times the blending ratio of reinforcing fibers in (B). After putting the composition (A) and the composition (B) into separate quantitative feeders, the compositions (A) and (B) are placed onto the lower mold (surface mold) of the dehydration press molding machine. Composition (A), composition (B
), press and mold using an upper mold (back mold), and cure and harden using a known method.

Examples will be explained in detail below along with comparative examples. (Example) Two types of compositions with the blending ratios shown in Table 1 (
Prepare A) and (B), and place the compositions (A) and (B) onto the lower mold of a dehydration press molding machine in a ratio of 1:1.
, Composition (B) were filled in this order, and dehydration press molding was performed using an upper mold to form a tile of a desired shape. (Comparative example) Composition (A) without using composition (B) in Table 1
A roof tile was molded in the same manner as in the example except that a chisel was used.

0010

[Table 1] In Table 1, vinylon has a length of 5 to 10 mm,
Fibers with a diameter of 10 to 20 μm were used.

[0011] For each roof tile obtained as described above, the elastic limit strength and breaking strength were measured according to JIS A 1408 ``Bending test method for architectural boards'', and the results were as shown in Table 2. The result was

0012

[Table 2] As shown in Table 2 above, it is clearly seen that all the numerical values in the Examples are higher by about 10 to 20% than in the Comparative Examples.

The tiles according to the present invention are not limited to the above embodiments. For example, in the above example, a desired roof tile is molded using a dehydration press molding machine using compositions with two types of blending ratios, but compositions with three or more blending ratios are prepared, and from the front side to the back side. The dispersion ratio of fibers may be gradually increased toward

[0014]

[Effects of the Invention] Since the roof tile according to the present invention is constructed as described above, it has strength against tensile stress concentrated on the back surface when force is applied from the front surface, and the reinforcing fibers are uniformly dispersed. It has a higher elastic limit and is stronger than roof tiles. Therefore, there is no possibility that heavy objects will be placed on the surface of the tile during transportation, or that the tile will be damaged even if a worker steps on the tile that has already been laid.

Claims (1)

[Claims] [Claim 1] A fiber-reinforced tile in which fiber material is dispersed and reinforced inside, characterized in that the fiber material is dispersed more on the back side of the tile than on the front side of the tile. Fiber reinforced tiles.