JP2701015B2 - 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 groove lid, a drainage lid, a root 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, and the concave portion is filled with a ceramic particle which is porously bound by a binder to form a water permeable material layer (water passing 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.

The inventor of the present invention has laid a thin perforated steel plate (bottom plate portion) having a thickness of about 1.6 mm on the lattice portion of the grating body, fixed by welding, and then formed a water-permeable material layer on the perforated steel plate. By filling, a trial was made of a zinc-plated water-permeable grating. According to this, the function of preventing the water-permeable material layer from being cracked or peeled as described above can be improved, and the corrosion resistance can be improved by galvanizing, but it has been found that the following problems occur.

(1) Distortion occurs when a punched steel sheet is spot-welded to a grating body, and a portion having a large expansion strain is broken by spot welding due to a temperature difference between a thin punched steel sheet and the grating body during hot-dip galvanizing. And partially floated by about 3 to 5 mm. In this case, the thickness of the filled permeable material layer becomes uneven, the thickness of the floating portion is reduced, and the load from above is concentrated on the distorted portion, and the permeable material layer of that portion is cracked. Or Such distortion can be eliminated by increasing the thickness of the punched steel sheet, but this increases the weight of the entire grating and makes it difficult to lay the grating. (2) When rainwater or the like passes through the water holes of the punched steel plate (bottom plate portion), zinc in the plating layer of the punched steel plate is corroded at an early stage. Lowers the adhesive strength and causes peeling over time.

The present invention has been made based on such findings, and provides a water-permeable grating that can further enhance the effect of preventing the water-permeable material layer from being cracked or peeled off and improve durability. The purpose is to do.

[0007]

According to the water-permeable grating of the present invention, a metal-made grating body has a lattice portion, a lower outer frame formed around the outer periphery of the lattice portion, and a lower outer frame formed on the lower outer frame. An upper open frame is formed by laying and fixing a hard resin bottom plate provided with a large number of water holes on the upper surface of the lattice portion, and forming an upwardly open concave portion. The kneaded resin binder is filled into a water-permeable state having a space to form a water-permeable material layer.

[0008]

When the bottom plate is made of a hard resin plate, there is no occurrence of distortion due to welding or the like as in the above-described bottom plate made of a thin punched steel plate, so that a load from above is evenly distributed over the entire grid portion. And the water-permeable material layer is less likely to crack. The resin bottom plate has a strong adhesive strength between the water permeable material layer and the resin binder, so that the water permeable material layer does not easily peel off, and the bottom plate itself is light in weight and does not significantly increase the weight of the entire grating.

[0009] The hard resin bottom plate is sufficient to be fixed to the lattice portion of the grating main body by passing a binding band, wire, string, or the like through the water passage hole, instead of the joining means by welding. Also, since it is lightweight and easy to handle, such a fixing operation can be performed more easily than the above-mentioned operation of spot welding a thin punched steel plate.

[0010]

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 permeable grating in a cutaway view, and FIG. 2 is an enlarged sectional view of a part before the permeable material layer is filled, and 1 is a galvanized steel-made grating body. Reference numeral 2 denotes a water-permeable material layer, 3 denotes an adhesive layer, 4 denotes a lattice portion, 8 denotes a bottom plate portion, and 9 denotes a concave portion.

The grating body 1 is formed by forming a lower outer frame 5 around the outer periphery of a grid portion 4 and forming an upper outer frame 6 on the lower outer frame 5. Water hole 7
The bottom plate portion 8 having the upper surface is laid and fixed, and the upper outer frame 6 and the bottom plate portion 8 form a concave portion 9 which is open upward. The depth of the recess 9 is 10 to 20 mm.

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 lattice part 4 is formed by a side plate 5 of the lower outer frame 5.
A cross made up of a plurality of steel plate main bars 4a arranged side by side at predetermined intervals between b and 5b, and a plurality of steel twist bars arranged side by side at predetermined intervals in a direction orthogonal to the main bar 4a. Each of the crossbars 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 crossbar 4b are connected to the end plates 5a of the lower outer frame 5 by welding.

The upper outer frame 6 has a pair of end plates 6 welded to the upper end of the end plate 5a of the lower outer frame 5.
a, and a pair of side plates 6 b integrally formed on the upper end of the side plate 5 b of the lower outer frame 5.

After assembling as described above, the grating body 1 is subjected to hot dip galvanizing or an alloy plating of zinc and 3 to 60% aluminum to improve corrosion resistance.

The bottom plate 8 is made of a hard resin plate, for example, hard vinyl chloride, and has a thickness of 1.5 mm.
The hole diameter of the water passage hole 7 is 3 mm, and the pitch of the water passage hole 7 is 7 mm. This bottom plate portion 8 is laid on the upper surface of the lattice portion 4.
At this time, a binding band 10 made of resin is prepared, and the binding band 10 is passed through a water passage hole 7 at an appropriate position, and the crossbar 4b is formed.
Alternatively, it is preferable that the bottom plate portion 8 is integrally fixed to the upper surface of the lattice portion 4 in close contact with the main bar 4a. The binding band 10 is, as shown in FIG.
Non-slip irregularities 12 are arranged in a row on one surface of the band main body 11, and a through portion 13 is integrally formed at one longitudinal end of the band main body 11. The through portion 13 has a through hole 14 through which the other end in the longitudinal direction of the band body 11 can pass, and a retaining claw 15 that engages with the unevenness 12 is provided in the through hole 14. When the binding band 10 is housed so that the through portion 13 is on the concave portion 9 side to form a resin binder contained in the water permeable material layer 2 described later or the adhesive layer 3, the adhesive layer 3 forms the through portion 13. Is preferable in that the loosening of the band body 11 can be reliably prevented.

Although it is not necessary to use the adhesive layer 3 described below, it is preferable to use the adhesive layer 3 in that the adhesive strength between the bottom plate 8 and the water-permeable material layer 2 described later can be further increased. 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. The thickness of the adhesive layer 3 is about 20 to 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) in the bottom plate portion 8, and even if the diameter of the water passage hole 7 is reduced, the water passage hole 7 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 application of the adhesive layer 3, a mixture obtained by kneading the aggregate and the resin binder is filled in the concave portion 9 in a water-permeable state having a gap between the aggregates to form the water-permeable material layer 2. Permeable material layer 2
Examples of the aggregate and the resin binder include, for example, pulverized colored glass particles (particle diameter: about 2 to 10 mm) in a weight ratio of 20 to 70.
Gravel that becomes an aggregate in the percentage of (% of the same size as colored glass)
By using a mixture obtained by adding and mixing an epoxy resin as a binder at a weight ratio of 6 to 12%, a water-permeable material layer 2 having coloring and excellent strength can be obtained. By the way, if colored glass particles are used, not only can various colors and patterns be formed, but also they do not fade even after a long period of time. These colored glass particles are
When used alone, it has sharp edges and is dangerous when it falls. Therefore, the pulverized material is kneaded with sand and steel particles, and the glass particles having sharp corners are granulated and used. When the weight ratio of the glass particles is less than 20%, the coloring effect is hardly obtained, and when the weight ratio exceeds 70%, the glass particles are weak against impact, which causes a problem in strength. When the weight ratio of the binder is 6% or less, the bonding strength becomes weak, and when it exceeds 12%, the gap between the aggregates is filled and the water permeability is lost. In addition, as the aggregate, only gravel may be used, and crushed rubber chips, ceramic particles, and the like can also be used. As the resin binder, a urethane-based resin, a polyester-based resin, a rubber-based resin, or the like may be used according to the material of the aggregate.

The grating main body 1 may be manufactured by casting a whole 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. The hole shape of the water passage hole 7 of the bottom plate portion 8 may be an elongated hole or a polygonal hole other than the round hole. When fixing the bottom plate portion 8 made of hard resin on the lattice portion 4 of the grating main body 1, instead of using the binding band 10, a fastening member such as a wire or a string may be used.

[0019]

As described above, according to the present invention, since the water-permeable material layer is filled with the bottom plate having water-permeable holes laid on the grating portion of the grating main body, the water-permeable material layer is made of an automobile. Even if it vibrates under a load such as that described above, it can be prevented from cutting into the edge of the lattice portion or cracking.

In particular, since the bottom plate portion is formed of a hard resin plate, there is no occurrence of distortion due to welding or the like unlike when the bottom plate portion is formed of a thin punched steel plate, and the load from above is reduced. It can be uniformly applied over the entire surface of the lattice portion, which is extremely advantageous in preventing cracks in the water-permeable material layer. Further, since the resin bottom plate can increase the adhesive strength of the water-permeable material layer to the resin binder, the effect of preventing the water-permeable material layer from peeling can be further enhanced. In addition, the resin bottom plate is lightweight and does not significantly increase the weight of the entire grating, and can be connected to the grid with a binding band, wire, string, etc. Work can be performed more easily, and workability can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a water-permeable grating according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a part of the water permeable grating before filling with a water permeable material layer.

[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 10 Binding band

Claims (1)

(57) [Claims] The metal grating body comprises a grid portion, a lower outer frame formed around the outer periphery of the grid portion, and an upper outer frame formed on the lower outer frame. On the upper surface, a hard resin bottom plate provided with a large number of water holes is laid and fixed to form an upper open concave portion. The concave portion is formed by kneading an aggregate and a resin binder. A water-permeable material layer formed by filling in a water-permeable state having: