JPH0676511U - Roof tiles - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide roof tiles with excellent impact strength. [Structure] A roof tile 3 having arc-shaped peaks 2 and flat portions 1 in which a lattice-shaped convex portion 6 is formed on the back surface of the flat portion 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to roof tiles.

[0002]

[Prior art]

 Conventionally, roof tiles made by molding and hardening hydraulic inorganic material have been widely used.The roof tiles have a corrugated shape and peaks and valleys are formed to have a substantially uniform thickness, or a flat roof tile is used as a whole. Some are molded to a uniform thickness. The roof tile made by molding and hardening these hydraulic inorganic materials has been considered in terms of strength so as to withstand the load when a person rides on the roof tile and the impact against falling objects. . However, although roof tiles made by molding and hardening these hydraulic inorganic materials are strong against simple compressive loads, they are weak against bending loads and impact forces, and it is necessary to increase the thickness of the roof tiles themselves to compensate for this drawback. Therefore, there is a problem that the weight of the roof tile increases, the workability during transportation and construction is significantly reduced, and the cost increases.

Therefore, in the case of a corrugated roof tile, the load is more likely to be applied to the valley portion rather than to the mountain portion. Therefore, an attempt has been made to increase the thickness of the valley portion to improve the strength against the load (Japanese Patent Laid-Open No. Sho 61-135). 63-223252). An improved roof tile that has uneven roof tiles, in which the convex protrusions that support the roof tile base material are partially provided on the bottom surface of the valley except the ridge-side and eave-side edges, is also available. (See Japanese Utility Model Publication No. 63-116621).

[0004]

[Problems to be solved by the device]

 However, in the improved device as described above, the corrugated roof tile increases the weight by increasing the thickness of the valley portion, and thus the weight reduction cannot be achieved. In addition, the roof tile described in Japanese Utility Model Laid-Open No. 63-11662 has the effect of increasing the load-bearing strength, but with respect to the impact force of a falling object, the stress concentrates in the direction of the bearing projection. Therefore, the impact strength was not improved.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a lightweight roof tile with improved impact resistance.

[0006]

[Means for Solving the Problems]

 To achieve the above object, in the present invention, a roof tile having an arc-shaped mountain portion and a flat portion has a grid-shaped convex portion formed on the back surface of the flat portion to form a roof tile. And

The roof-shaped roof tiles of the present invention are provided on the back surface of the flat portion, and the roof-shaped roof tiles are provided in a portion of the roof tiles that does not come into contact with the roof plate when the roof tiles are stacked. Preferably.

If the height of the convex portion of the grid-like convex portion is 2 mm or less, it is insufficient to improve the impact strength, and if it exceeds 10 mm, it becomes bulky and unstable during stacking and transportation, so it is not possible to do so. It is uneconomical because the quantity that can be handled is reduced. From this, it is appropriate that the height of the convex portions of the lattice-shaped convex portion is in the range of 2 to 10 mm. Further, if the width of the convex portion of the lattice-like convex portion is 2 mm or less, it is insufficient to improve the impact strength, and if it is 10 mm or more, the impact strength cannot be expected to be further increased, and the weight is not enough. Since it increases too much, 2-10 mm is preferable.

It is preferable that the grid-shaped convex portion of the roof tile of the present invention has a substantially rectangular shape along the shape of the back surface of the flat portion, and the length of the long side of this rectangular shape is the same as the above description. It is not particularly limited as long as it does not come into contact with. If the distance between the lattice-shaped convex portions is 5 mm or less, there is no weight reduction effect, and if it is 30 mm or more, the impact strength cannot be improved. Therefore, the distance is preferably in the range of 5 to 30 mm.

In the roof tile of the present invention, a hydraulic inorganic material containing a hydraulic inorganic substance as a main component is used, and if necessary, a reinforcing material such as a filler or a synthetic fiber is added to the hydraulic inorganic material. May be added.

Further, as the roof tile forming method of the present invention, a papermaking method, a pressing method, a dewatering pressing method, an extrusion pressing method, and further, it is described in a research result report of the Aichi Prefectural Tokoname Ceramics Technology Center in 1988. The vibration pressing method may be used, but is not particularly limited as long as it is a processing method capable of forming the grid-shaped convex portions of the lightweight roof tile of the present invention.

[0012]

[Action]

 In the present invention, in a roof tile having an arc-shaped mountain portion and a flat portion, since the lattice-shaped convex portions are formed on the back surface of the flat portion, the impact strength is improved without significantly increasing the product weight. It can be a lightweight roof tile.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a rear perspective view showing an example of the roof tile of the present invention. In FIG. 1, 1 is a flat portion, 2 is an arc-shaped ridge portion, and two ridge portions 2 are connected to each other between three portions of the flat portion 1. On the back surface, a grid-shaped convex portion 6 composed of a grid-shaped convex portion 4 and a concave portion 5 is formed to form a roof tile 3.

In this example and Examples 1 to 7 described later, 100 parts by weight of ordinary Portland cement (manufactured by Onoda Cement) was used as a main material of a raw material for forming roof tiles, and fly ash (bulk specific gravity) was used. 0.6, true specific gravity 2.3 50 parts by weight of KANDENKA KOGYO CO., LTD., 50 parts by weight of water to 2 parts by weight of vinylon fiber (thickness 2 denier, length 6 mm manufactured by Kuraray Co., Ltd.) as a reinforcing material, and mixed by stirring. However, a hydraulic inorganic material was used.

Next, the height of the convex portions 4 of the lattice-shaped convex portions 6 provided on the flat portion 1 on the back surface of the roof tile of the present invention is 2 mm and the width thereof is 5 mm, and the interval between the convex portions 4 forming the lattice shape. A mold having a size of 5 mm was attached to a dewatering press, and the above hydraulic inorganic material was poured into the mold for dewatering press to form the lightweight roof tile shown in FIG. This was cured for 6 hours in an atmosphere of 60 ° C. and 90% RH to obtain a finished product.

For the comparative evaluation of impact strength, the same hydraulic inorganic material as that used in the above example was used, and each part of the grid-shaped convex portion 6 was formed by a mold having dimensions shown in Examples 1 to 7 in Table 1. Various evaluation samples were prepared in the same manner as above.

[0017]

[Table 1]

[0018]

[Table 2]

The results are shown in Table 1. In Table 1, the impact strength [m] is the result of a test according to the drop test (JIS A 1421) with a 1-kg weight cone placed on a sand with a thickness of 10 cm. The numerical values show the heights of cracks on the front and back surfaces of the weight cone. Weight [Kg] is the product weight of the prepared sample.

Next, in order to compare the roof tile of the present invention with an improved type device of the conventional product, the same hydraulic inorganic material as in the above-mentioned embodiment is used. No flat protrusions on the flat plate, 2) Similarly, three flat protrusions with a height of 10 mm, a width of 10 mm, and a length of 250 mm are formed on the back flat part for reinforcement, 3) Similarly, Only the flat part was prepared by increasing the thickness to 8 mm, and the impact strength [m] was measured in the same manner as in Table 1. The results are shown in Table 2.

From these results, in the roof tile of the present invention, the impact strength [m] is approximately 1.7 to 3 times that of the conventional product and the improved type of the conventional product. Moreover, the object could be achieved with almost no increase in weight.

[0022]

[Effect of the Invention] With the roof tile of the present invention, it is possible to obtain a roof tile having a high impact strength that has never been achieved without increasing the weight. Therefore, it is suitably used as a roof tile.

[Brief description of drawings]

FIG. 1 is a rear perspective view showing an example of a roof tile of the present invention.

[Explanation of reference numerals] 1 flat portion 2 mountain portion 3 roof tile 4 convex portion 5 concave portion 6 lattice-shaped convex portion

Claims (1)

[Scope of utility model registration request] 1. A roof tile having an arc-shaped mountain portion and a flat portion, wherein a roof-shaped roof tile is formed on a back surface of the flat portion.