JP2818924B2 - Permeability grating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-permeable grating used for a ditch cover, a drain cover, a base cover of a tree, and the like.

[0002]

2. Description of the Related Art As a water-permeable grating of this type, for example, as disclosed in Japanese Patent Publication No. 5-36581, an upper surface of the grating portion of a grating body composed of a grating portion and an outer frame surrounding the periphery thereof. There is a case in which a concave portion is formed in the concave portion, and a porous material layer (water-permeable portion) is formed by embedding ceramic particles in a porous state with a binder in the concave portion. The water-permeable material layer is formed for preventing slippage and coloring decoration while ensuring the permeability of rainwater and the like.

[0003]

However, in the above-mentioned conventional water-permeable grating, the water-permeable material layer is formed directly on the grating portion of the grating body, so that the water-permeable material layer breaks with time, It was easy to peel off. In particular, the water-permeable material layer vibrated under the load of an automobile or the like passing over the layer, so that the layer penetrated into the edge of the lattice portion and was easily broken, and was easily peeled off due to the slip of the automobile tire and the like. SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems as described above and prevent the water-permeable material layer from cracking or peeling.

[0004]

The water-permeable grating of the present invention comprises a grid, a lower outer frame formed around the outer periphery of the grid, and an upper outer frame formed on the lower outer frame. A steel grating body having a bottom plate portion laid and fixed on the upper surface of the lattice portion, and an upper open concave portion formed by the upper outer frame and the bottom plate portion, has a zinc hole. Plating or zinc-aluminum alloy plating,
After forming an adhesive layer on at least the upper surface of the bottom plate portion in the concave portion, a material obtained by kneading an aggregate and a binder is filled into the concave portion into a water-permeable state having a gap, thereby forming a water-permeable material layer It is. As the adhesive, a one-component urethane resin, polyester resin, or epoxy resin may be used, and a rubber adhesive may be used. Rubber chips, fine stones, sand, ceramic particles and the like are used as the above-mentioned aggregate. As a binder for the rubber chip aggregate, a urethane resin-based thermoplastic resin or a rubber-based binder is used, and when a fine stone or ceramic particles are used as an aggregate, the binder is a urethane resin-based, polyester resin-based, epoxy resin Use the system.

[0005]

The bottom plate having a large number of water holes has a function of allowing water passing through the water-permeable material layer to pass through the lattice,
Exhibits the function of preventing cracks in the permeable material layer due to the edges of the lattice. By applying zinc plating or zinc-aluminum alloy plating to the steel grating body, the corrosion resistance of the grating body is improved.

The adhesive layer not only enhances the adhesion between the water permeable material layer and the inside of the recess of the grating body, but also improves the durability of the above-mentioned adhesion to suppress the corrosion of zinc in the plating layer in the recess. That is, the plated zinc has a sacrificial anticorrosion property and thus contributes to the corrosion prevention of the steel grating body. If only the binder in this layer is used to adhere, the zinc in the plating layer in contact with the water-permeable material layer will corrode, thereby reducing the adhesion between the water-permeable material layer and the grating body, and the water-permeable material This lowers the adhesion durability of the layer and causes the water-permeable material layer to peel off. In particular, the water-permeable material layer has better drainage properties than those filled with a water-impermeable material in order to transmit rainwater, etc.
The corrosion of zinc occurs at an early stage, and the adhesion durability of the water-permeable material layer is reduced. However, when an adhesive layer is interposed between the water permeable material layer and the recessed portion of the grating main body as in the above configuration, it is possible to prevent such early corrosion of zinc, and the water permeable material layer and the grating main body can be prevented from being corroded. The adhesion durability can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the water-permeable grating according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a part of the water-permeable grating in a cut-away manner, and FIG. 2 is an enlarged cross-sectional view of a part thereof, wherein 1 is a zinc-plated steel grating body, 2 is a water-permeable material layer, 3 is It is an adhesive layer. The grating main body 1 has a lower outer frame 5 formed around the outer periphery of the grid portion 4 and an upper outer frame 6 formed on the lower outer frame 5. A bottom plate portion 8 having a bottom 7 is laid and fixed, and an upper open frame-shaped concave portion 9 is formed by the upper outer frame 6 and the bottom plate portion 8.

The lower outer frame 5 is formed by welding a pair of steel-made end plates 5a and side plates 5b into a rectangular frame. The grid portion 4 is formed of a side plate 5b of the lower outer frame 5.
A crossbar 4b composed of a plurality of steel-made main bars 4a arranged side by side at a predetermined interval between 5b and a plurality of steel twist bars arranged side by side at a predetermined interval in a direction orthogonal to the main bar 4a And each crossbar 4b
Is connected to the upper end of the main bar 4a by fixing means such as pressure welding. The longitudinal ends of the main bar 4a are connected to the side plates 5b of the lower outer frame 5 by welding, and the longitudinal ends of the cross bar 4b are connected to the end plates 5 of the lower outer frame 5.
a by welding.

The upper outer frame 6 comprises a pair of end plates 6a welded to the upper ends of the end plates 5a of the lower outer frame 5, and a pair of side plates 6b integrally formed on the upper ends of the side plates 5b. . The bottom plate portion 8 is made of a punched steel plate (for example, a plate thickness of 1.6 mm, a water passage hole diameter of 3 m).
m, pitch 60 mm) is laid on the grid portion 4 and fixed by spot welding. Since the bottom plate portion 8 made of a punched steel plate is supported by the lattice portion 4, a thin material is sufficient, and a flat plate material is sufficient, so that manufacturing is easy. The depth of the concave portion 9 formed by the bottom plate portion 8 and the upper outer frame 6 is about 10 mm.

After assembling the grating body 1 in this way, the entire grating body 1 is hot-dip galvanized.
Alternatively, an alloy plating of zinc and 3 to 60% aluminum is applied. After plating, an adhesive is applied to the upper surface of the bottom plate portion 8 in the concave portion 9 of the grating main body 1 and dried to form the adhesive layer 3. The adhesive layer 3 may be formed not only on the upper surface of the bottom plate portion 8 but also on the inner surface of both the end plate 6a and the side plate 6b of the upper outer frame 6 or any one of them. In this case, the thickness of the adhesive layer 3 is 20
About 100 μm. With such a thickness, the adhesive layer 3 is formed along the inner periphery of the water passage hole 7 (about 3 mm in diameter) of the bottom plate portion 8, and even if the diameter of the water passage hole 7 is reduced, the adhesive layer 3 is formed.
There is no such thing as blocking up. As the adhesive, a one-component urethane resin-based adhesive may be used, and in addition, a polyester resin-based, epoxy resin-based, or rubber-based adhesive may be used. The adhesive may contain a rust-preventive pigment such as strontium chromate.

After the formation of the adhesive layer 3, a mixture obtained by kneading the aggregate and the binder is filled into the concave portion 9 in a water-permeable state having a gap between the aggregates to form the water-permeable material layer 2. As the aggregate, a rubber chip of 2 to 8 mm per piece is used, and as the binder, a material that can withstand the elongation of the rubber chip aggregate, for example, a urethane resin-based thermoplastic resin or a rubber-based material is preferable. Low epoxy resin systems should be avoided.
When a rubber chip is used as an aggregate, a cushioning effect and a soundproofing effect can be obtained in addition to an anti-slip effect and an effect of easily giving colored decoration.

As the aggregate, besides, the particle size is 2 to 10 m.
m stone or ceramic particles can also be used. In this case, a urethane resin, a polyester resin, or an epoxy resin is used as the binder. When stone or ceramic particles are used as the aggregate, an effect of excellent abrasion resistance can be obtained in addition to an effect of easily providing anti-slip and coloring decoration.

As shown in FIG. 3, the grating main body 1 may be manufactured by casting the entire structure except the bottom plate portion 8 into an integral structure. Further, in the grating main body 1, the constituent member of the concave portion 9 and the lattice portion 4 may be manufactured as separate members, and then both may be integrally connected. Bottom plate 8
The hole shape of the water passage hole 7 may be an elongated hole or the like other than the round hole, and the bottom plate portion 8 may be formed in a flat plate shape instead of the whole.
As shown in FIG. 4, it may be formed in a dish shape that matches the internal shape of the recess 9.

[0014]

As described above, according to the water-permeable grating of the present invention, the water-permeable material layer is filled with the bottom plate having the water passage hole laid on the grating portion of the grating body. Even if the material layer vibrates under the load of an automobile or the like, it is possible to prevent the material layer from cutting into the edge of the lattice portion or being cracked. Further, since the steel grating body is plated with zinc or zinc-aluminum alloy, a grating body having good corrosion resistance can be obtained.

Moreover, since the water-permeable material layer is filled on the bottom plate portion in the concave portion of the grating main body via the adhesive layer,
The water permeable material layer can be firmly and firmly adhered to the inner surface of the concave portion of the grating body by the adhesive force of the adhesive layer, and the adhesive layer suppresses the corrosion of zinc in the plating layer in the concave portion so that the water permeable material layer adheres. The durability can be improved, and the effect of preventing the water-permeable material layer from peeling can be further enhanced, resulting in excellent durability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a water-permeable grating in a cutaway manner.

FIG. 2 is an enlarged sectional view of a part of the water-permeable grating.

FIG. 3 is a perspective view of a part of a grating main body excluding a bottom plate portion, showing another embodiment.

FIG. 4 is a perspective view of a bottom plate portion showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grating main body 2 Water permeable material layer 3 Adhesive layer 4 Lattice part 5 Lower outer frame 6 Upper outer frame 7 Water passage hole 8 Bottom plate part 9 Concave part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E03F 5/06

Claims (1)

(57) [Claims] 1. A grid, a lower outer frame formed around the outer periphery of the grid, an upper outer frame formed on the lower outer frame, and a plurality of water holes, A bottom plate portion laid and fixed on the upper surface, and a steel grating body having an upwardly open concave portion formed by the upper outer frame and the bottom plate portion, are subjected to zinc plating or zinc-aluminum alloy plating, After forming an adhesive layer on at least the upper surface of the bottom plate portion in the recess, filling the kneaded aggregate and binder into a water-permeable state having a space in the recess to form a water-permeable material layer Water-permeable grating.