JP6940066B2 - Artificial turf structure - Google Patents

Description

The present invention is mainly used in sports competition facilities such as futsal and soccer, nursery schools, parks, nursing care and welfare facilities, etc., and has an artificial turf structure that has a feel like natural turf and high cushioning properties, and is easy to construct. Regarding.

Artificial turf is widely used in various sports stadiums and practice fields because it is easier to maintain and manage than natural turf. In recent years, artificial turf has been used in playgrounds for nursery schools and recreational plazas for long-term care facilities. In general, artificial turf has a structure in which an artificial turf sheet is laid on a hard foundation ground layer such as concrete or asphalt, so it is inferior in cushioning property to natural turf whose foundation ground layer is soil, and athletes. It has been pointed out that there is a problem that the legs and waist are burdened.

Therefore, various laying structures have been proposed in order to improve the cushioning property of artificial turf. For example, Patent Document 1 by the applicant of the present application proposes an underlay cushion mat for artificial turf having a structure in which an elastic sheet such as urethane chip foam and a fiber material sheet such as non-woven fabric are laminated. Further, in Patent Document 2, an artificial turf base layer composed of an elastic foam sheet having openings and continuous portions substantially regularly, and an elastic pavement material laminated on the sheet while filling the openings of the sheet. Underpads have been proposed.

Japanese Unexamined Patent Publication No. 2011-58287 Japanese Unexamined Patent Publication No. 3-194007

According to the structure of the underlay cushion mat of Patent Document 1 and the underpad of Patent Document 2 described above, the surface portion on which the artificial turf sheet is placed is formed in a substantially horizontal state. On the other hand, natural turf has some unevenness on the surface of the soil itself because the lawn is planted in the soil. Therefore, the artificial turf structure in which the artificial turf sheet is laminated on a flat sheet material or the like has a different feel (treading comfort) from the natural turf in which the lawn is planted in the soil. In addition, natural turf has turf roots in the soil, so it is not slippery and has a gripping feel, but since the artificial turf structure does not have such a structure, it has a gripping feel similar to that of natural turf. Is required.

Therefore, the present invention has been made in view of the above points, and an object of the present invention is to provide a foot-friendly artificial turf structure having a natural turf-like feel (treading comfort, grip feeling) and high cushioning properties. There is.

In order to solve the above problems, the artificial turf structure of the present invention includes a substrate made of hard foam, a mesh sheet made of soft foam, and an artificial turf sheet in which a plurality of piles are planted on a base cloth. Laminated in this order, on the surface of the substrate, concave grooves that can be detachably fitted to the mesh frame of the mesh sheet are formed in a mesh shape, and the substrate and artificial turf are formed in the area of the mesh holes of the mesh sheet. A gap is formed between the sheet and the sheet.

The artificial turf structure is formed by laminating a substrate, a mesh sheet, and an artificial turf sheet in this order from the lower side. The substrate and the mesh sheet are recessed grooves arranged in a mesh pattern on the surface of the substrate. Since the mesh frame of the mesh sheet is fitted into the mesh frame to connect the sheets, the assembly can be easily positioned, and the two can be immediately fitted and laminated. In addition, the mesh hole portion of the mesh-like sheet is configured so that a gap is formed between the artificial turf sheet stacked on top of the artificial turf sheet and the substrate, thereby giving a feel (treading comfort) like natural turf. , Grip feeling) can be obtained. Specifically, since the artificial turf sheet is supported by the mesh frame portion of the mesh-like sheet, when the user applies a force toward the ground, the mesh frame portion made of soft foam first absorbs the force. Since the voids of the mesh holes are easily dented, a soft feel that absorbs force can be obtained while having some irregularities like natural turf. Further, since a height difference is generated between the mesh frame and the gap portion of the mesh hole, it is difficult to slip and it is easy to grip. When a stronger force is applied toward the ground, the force is also dispersed on the surface of the substrate in the mesh holes, but since the substrate is formed harder than the mesh sheet, the force is applied to the entire substrate. Be distributed. As described above, the combined structure of the mesh-like sheet and the substrate has a multi-stage and high buffering action. In addition, when a lateral force such as sliding is applied as well as a vertical force, the tip of the mesh frame absorbs the impact and acts as a convex portion that prevents slipping in the lateral direction. Therefore, it is possible to prevent the vehicle from slipping too much and falling over. In the present specification, the term "up and down" means the vertical direction when the artificial turf structure is installed on the foundation ground layer and used, that is, the vertical direction when the artificial turf sheet is installed on the upper side. do.

Further, in the artificial turf structure of the present invention, the thickness of the mesh-like sheet is substantially constant, and the thickness (T) of the mesh-like sheet is larger than the groove depth (D) of the concave groove of the substrate (T> D). ) Is preferable. By making the thickness of the mesh-like sheet thicker than the groove depth of the concave groove of the substrate, a gap can be easily provided between the substrate and the artificial turf sheet in the region of the mesh hole.

Further, it is also preferable that the mesh-like sheet is formed by laminating different types of foam sheets, and the hardness of each layer gradually decreases toward the artificial turf sheet side. As a result, a more multi-stage buffering action can be obtained. Further, by setting the hardness of the laminated foam sheet to low hardness (soft foam) on the artificial turf sheet side and high hardness (hard foam) on the foundation ground layer side, a soft treading comfort can be obtained.

Further, the mesh sheet is a foam sheet having a plurality of cut lines penetrating in the thickness direction, and the cut lines are opened by pulling the foam sheet in a direction substantially perpendicular to the cut direction of the cut lines. It is also preferable that the sheet is a stretchable sheet configured so as to form a mesh-like sheet having a mesh hole and a mesh frame. By making the mesh-like sheet a stretchable sheet, it is possible to make the transfer of parts to the construction site of artificial turf compact, so that the transportation cost can be reduced and it is easy to carry. Moreover, since the expansion and contraction method is as simple as pulling, the construction itself is also easy.

It is also preferable that the substrate is provided with a plurality of protrusions on the back surface thereof. As a result, a gap for ventilation is formed between the protrusions, so that air flow is improved and dew condensation on the floor surface on which the artificial turf structure is laid (hereinafter, also simply referred to as the floor surface) is prevented. In addition, when installed outdoors, it serves as a drainage channel for rainwater, which improves drainage and drainage.

Further, it is also preferable that the substrate is provided with a water passage hole penetrating in the thickness direction at a convex portion which is a portion where the concave grooves intersect with each other or a portion other than the concave groove. As a result, rainwater when installed outdoors and cleaning water for cleaning can be drained satisfactorily from the upper side to the lower side.

According to the present invention, it is possible to provide an artificial turf structure having the following excellent effects.
(1) It has a feel like natural turf in terms of both treading comfort and grip feeling. Even if you move quickly, it is hard to slip and you can step on it, so it is hard to fall.
(2) Since it has multi-stage and excellent cushioning properties, it is gentle on the legs and waist and does not cause fatigue.
(3) The laying work is easy, and in maintenance, not only the damaged part but also the worn-out sheet material can be replaced, so that it is easy to maintain an appropriate turf condition.

It is (a) disassembled perspective view and (b) perspective view of the artificial turf structure which concerns on 1st Embodiment. FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1 (b). It is (a) plan view and (b) BB line sectional view of the substrate constituting the artificial turf structure which concerns on 1st Embodiment. It is (a) plan view and (b) CC line sectional view of the mesh-like sheet constituting the artificial turf structure which concerns on 1st Embodiment. It is a partial end view explaining the underlay sheet which comprises the artificial turf structure which concerns on 1st Embodiment. It is explanatory drawing which shows schematic the use state of the artificial turf structure which concerns on 1st Embodiment. 2A is a partial plan view of a substrate and (b) is a partial cross-sectional view of an artificial turf structure according to a second embodiment. In the (a) partial plan view of the substrate, (b) the partial plan view of the underlay sheet in which the substrate and the mesh sheet are combined, and (c) the partial cross-sectional view of the artificial turf structure according to another example of the second embodiment. be.

As shown in FIG. 1, the artificial turf structure 1 according to the first embodiment of the present invention is configured by laminating a substrate 2, a mesh sheet 3, and an artificial turf sheet 6 from the lower side (installation surface side). Has been done. Hereinafter, the underlay structure in which the substrate 2 and the mesh-like sheet 3 are combined will be described as the underlay sheet material 4.

The substrate 2 constituting the artificial turf structure 1 according to the present embodiment will be described with reference to FIGS. 1 to 4. The substrate 2 in the present embodiment is provided with recessed grooves 21 in a mesh shape on the front surface side (upper surface side) which is a laminated surface with the mesh-like sheet 3. The concave groove 21 is formed so that it can be detachably joined with the mesh frame 31 of the mesh sheet 3 described later, and corresponds to the shape of the mesh frame 31 of the mesh sheet 3. Then, when the surface of the portion other than the concave groove 21, that is, the convex portion 22 surrounded by the concave groove 21 is formed flat, and the concave groove 21 of the substrate 2 and the mesh frame 31 of the mesh-like sheet are aligned with each other. It corresponds to the shape of the mesh hole 32 of the mesh sheet 3 so that the convex portion 22 enters the inside of the mesh hole 32 of the mesh sheet 3. Further, the convex portion 22 may have a shape (weight stand shape) that becomes thinner toward the upper end of the surface of the convex portion 22. The shape of the concave groove 21 of the substrate 2 does not have to be exactly the same as the shape of the mesh frame 31, and the concave grooves can be detachably fitted to the mesh frame 31 of the mesh sheet 3 and are arranged in a mesh shape. As long as the mesh frame 31 can be supported as a whole by 21, there may be different parts.

The concave groove 21 of the substrate 2 is formed so that at least a part of the groove wall 21a is in contact with the frame wall 31a of the mesh frame of the mesh sheet 3, and therefore, the mesh frame 31 is a groove wall of the concave groove. It is supported and fixed to 21a. Therefore, the groove width 21W of the concave groove is formed to have the same width as the frame width 31W of the mesh frame. However, the entire groove width 21W of the concave groove does not have to be as wide as the frame width 31W of the mesh frame of the corresponding portion, and if the mesh frame 31 can be supported as a whole, both of them. May have different parts. In the present embodiment, the groove width 21W of the concave groove 21 is formed to be approximately 6 mm, and the frame width 31W of the mesh frame is formed to be approximately 6 mm. Further, the groove depth 21D of the concave groove 21 is formed shorter than the length corresponding to the thickness 3T of the mesh-like sheet (height 31H of the mesh frame). As a result, a gap 5 is formed between the surface of the convex portion 22 of the substrate 2 and the artificial turf sheet 6. From the viewpoint of cushioning and walking ability, the gap 5 is preferably adjusted to have a groove depth 21D of the concave groove 21 so that the height of the gap 5 is 5 mm to 20 mm, more preferably about 7 mm to 10 mm. It is preferable to adjust so as to be. Although not particularly limited, in the present embodiment, the groove depth 21D of the concave groove 21 is formed to be 5 mm, and the thickness 3T of the mesh-like sheet is 13 mm, so that a gap 5 having a height of about 8 mm is formed. ..

On the back surface of the substrate 2 according to the present embodiment, protrusions 23 protruding downward are provided in a grid pattern. When the protrusion 23 is in contact with the foundation ground layer, a gap 24 is formed between the protrusion 23 and the foundation ground layer to allow air to flow, so that dew condensation on the floor surface can be suppressed. Further, when the artificial turf structure is installed outdoors, the gap 24 serves as a water passage for rainwater, so that drainage is improved and drainage is improved.

The substrate 2 is made of a hard foam, and is made of a foam harder than the mesh sheet 3. As its physical properties, the compressive strength (corresponding to hardness) measured in accordance with JIS K7220 "Hard foamed plastic-How to determine compression characteristics" ^{is preferably 5 to 40 N / cm 2} , preferably 10 to 35 N. The one with / cm ² is more preferable, and the one with 15 to 30 N / cm ² is particularly preferable. The material of the substrate 2 is not particularly limited as long as it has the above-mentioned hardness and cushioning property, and specific examples thereof include foamed polyurethane and foamed polyolefin. As the hard foam constituting the substrate 2, since it is necessary to provide the concave groove 21, a hard foam having a thickness of about 10 mm to 50 mm is preferably used. In the present embodiment, the substrate 2 is made of expanded polypropylene having a thickness of 18 mm and a hardness of 30 N / cm ^{2, although not particularly limited.}

By pressing the above-mentioned hard foam into a mesh groove shape from the surface side in a mesh pattern at a predetermined temperature and pressure, the substrate 2 having the concave groove 21 and the convex portion 22 can be easily obtained. Similarly, the protrusions 23 and the gaps 24 are formed by pressing the hard foam from the back surface side in a lattice pattern at a predetermined temperature and pressure. The method for manufacturing the substrate 2 is not limited to the above-mentioned method, and for example, a hard foam sheet cut out in the shape of the convex portion 22 is placed on another hard foam so that a concave groove 21 is formed. The substrate 2 can also be obtained by adhesively fixing the substrate 2.

Next, the mesh-like sheet 3 will be described with reference to FIGS. 1 to 4. The mesh-like sheet 3 in the present embodiment is mainly composed of a mesh frame 31 and a mesh hole 32 which is a hole inside the frame. The mesh frame 31 is formed so that it can be detachably joined with the concave groove 21 of the substrate 2 described above, and corresponds to the shape of the concave groove 21 of the substrate 2. Then, the mesh hole 32 is formed in the substrate 2 so that the convex portion 22 of the substrate 2 enters the inside of the hole of the mesh hole 32 when the mesh frame 31 of the mesh sheet 3 and the concave groove 21 of the substrate 2 are aligned. It corresponds to the shape of the convex portion 22. The shape of the mesh frame 31 of the mesh sheet 3 does not have to be exactly the same as the shape of the concave groove 21, and can be detachably fitted to the concave groove 21, and the mesh frame 31 is supported by the concave groove 21 as a whole. If so, there may be different parts between the two. The mesh pattern may have any pattern shape, and examples thereof include a polygonal shape such as a triangle, a rectangle, a rhombus, and a hexagon, an ellipse, a circle, and an indefinite shape. In this embodiment, as an example, a mesh pattern having a rhombus-like shape as a mesh hole 32 is used.

The mesh frame 31 of the mesh-like sheet 3 is formed so that at least a part of the frame wall 31a of the mesh frame abuts and fits with the groove wall 21a of the concave groove of the substrate 2, and the mesh frame 31 is concave. It is supported and fixed to the groove wall 21a of the groove. Therefore, the frame width 31W of the mesh frame is formed to have the same width as the groove width 21W of the concave groove. However, the entire frame width 31W of the mesh frame does not have to be as wide as the groove width 21W of the concave groove of the corresponding portion, and if the mesh frame 31 is supported by the concave groove 21, both can be used. There may be different parts. The width of the mesh frame with a frame width of 31 W is 3 mm to 30 mm from the viewpoint of supporting the artificial turf sheet 6 and obtaining a feeling (treading comfort, grip feeling) like natural turf, which is the effect of the present invention. It is preferably 5 mm to 15 mm, and more preferably 5 mm to 15 mm. In the present embodiment, the frame width 31W of the mesh frame is formed to be approximately 6 mm, and the groove width 21W of the concave groove 21 is formed to be approximately 6 mm, although not particularly limited. Further, the height 31H of the mesh frame is formed longer than the length corresponding to the groove depth 21D of the concave groove. As a result, a gap 5 is formed between the convex portion 22 of the substrate 2 and the artificial turf sheet 6, that is, inside the mesh hole 32. In the present embodiment, the groove depth 21D of the concave groove 21 is formed to be 5 mm, and the height 31H of the mesh frame is 13 mm, so that the gap 5 having a height of about 8 mm is formed in the mesh hole 32. It is formed inside. The gap 5 may be adjusted according to the hardness of the mesh sheet 3, and from the viewpoint of cushioning and walking ability, the thickness of the mesh sheet 3T (of the mesh frame) so that the height of the gap 5 is 5 mm to 20 mm. The height (31H) is preferably adjusted and selected, and more preferably adjusted to about 7 mm to 10 mm. Further, mesh holes 32 may be adjusted in accordance with the hardness of the net-like sheet 3, in view of the walking of the cushioning size of the mesh holes 32 preferably adjusted to ^{3 cm} 2 to 20 cm ² approximately, 4 cm It is more preferably about ^{2 to} 10 cm ^2. The size of the rhombus-like mesh hole 32 of the present embodiment is designed to be ^{about 6 to 7 cm 2.}

The mesh-like sheet 3 is made of a soft foam, and is made of a foam that is softer than the substrate 2. Specifically, the hardness measured in accordance with JIS K6400-2 "Soft foam material: Hardness and compressive stress-How to determine strain characteristics" (40% compression) is 0.5 to 20 kN. It is preferably 1 to 10 kN, more preferably 1 to 5 kN, and particularly preferably 1 to 5 kN. As the soft foam constituting the mesh-like sheet 3, since it is necessary to form the gap portion 5, a soft foam having a thickness of about 10 mm to 50 mm as a whole is preferably used. Further, the mesh-like sheet 3 may have a structure in which a plurality of foam sheets are laminated, or a structure in which different types of foam sheets are laminated. When laminating different types of foam sheets to form the mesh-like sheet 3, it is preferable to stack the foam sheets so that the hardness gradually decreases toward the artificial turf sheet 6. In the present embodiment, the mesh-like sheet 3 is formed by laminating and adhering two foam sheets, an upper first foam sheet 3a and a lower second foam sheet 3b. The upper first foam sheet 3a has a hardness lower than that of the lower second foam sheet 3b, and a soft sheet is selected, whereby a multi-stage buffering action can be obtained. The material of the mesh-like sheet 3 may be any material having the above-mentioned hardness and cushioning property, and is not particularly limited, but specifically, foamed polyolefin such as foamed polyethylene, foamed polyurethane, ethylene-vinyl acetate. Examples thereof include a copolymer resin foam and foamed silicone. Further, the first foam sheet 3a and the second foam sheet 3b may be made of the same material or may be made of different materials. In the present embodiment, the mesh-like sheet 3 is not particularly limited, but the first foam sheet 3a includes a sheet formed of an independently foaming type silicone foam having a thickness of 3 mm and a hardness of 1.5 kN, and a second foam sheet 3a. As the foam sheet 3b, a sheet formed by a self-foaming type polyethylene foam having a thickness of 8 mm and a hardness of 2.5 kN is laminated and bonded.

As shown in FIG. 4A, the mesh-like sheet 3 in the present embodiment is a stretchable sheet, has a plurality of cut lines 3L penetrating in the thickness direction of the sheet, and has a cut direction of the cut lines 3L. By pulling the sheet in a direction substantially perpendicular to the vertical direction, the cut line 3L is opened so that the mesh hole 32 and the mesh frame 31 are formed. By making the mesh-like sheet 3 a stretchable sheet in this way, it is possible to make the transfer of parts to the construction site of the artificial turf compact, so that the transportation cost can be reduced and it can be carried small, so that it is easy to handle. It becomes. Further, since the expansion / contraction method is as simple as pulling, the underlay sheet material 4 is completed only by pulling and expanding the substrate 2 and then fitting it into the concave groove 21 of the substrate 2, and the construction itself is very easy. The mesh-like sheet 3 does not have to be a stretchable sheet, and may be, for example, a sheet formed by opening the mesh holes 32 by punching or the like.

Next, the artificial turf sheet 6 will be described. The artificial turf sheet 6 in the present embodiment is a sheet in which a plurality of piles 62 resembling turf are planted on a base cloth 62, and any kind of artificial turf sheet distributed in the market can be used. The base cloth 62 is formed of a woven fabric, a non-woven fabric, a knitted fabric, or a resin sheet, and even if a backing material for fixing the planted pile 62 and preventing it from falling off is provided on the back surface of the base cloth 62. good. Further, depending on the intended use, the structure may be such that sand, elastic chips, or the like are filled between the base cloth 62 and the pile 62.

When a plurality of artificial turf structures 1 of the present invention are connected and laid, the artificial turf structure 1 may be provided with connecting means. As the connecting means, known connecting means used in the artificial turf structure can be applied as long as it does not interfere with the action and effect of the present invention.

In the construction of the artificial turf structure 1 according to the present embodiment, the substrate 2 is laid on the construction surface, and the mesh frame 31 of the mesh sheet 3 is pushed from above into the concave groove 21 formed on the substrate 2 with a light force. This is done by fitting and stacking the artificial turf sheet 6 on it. Since the substrate 2 and the mesh sheet 3 are connected by fitting the concave groove 21 and the mesh frame 31, it is not necessary to bond the substrate 2 and the mesh sheet 3 with an adhesive or the like. Further, since the mesh-like sheet 3 is formed as a stretchable sheet, it is easy to handle without being bulky in a contracted state during transportation or transportation, and it expands to a predetermined shape by simply pulling one end during construction. , Can be constructed efficiently.

Next, the operation of the underlay sheet material 4 in which the substrate 2 and the mesh-like sheet 3 are combined will be described with reference to FIGS. 5 and 6. As shown in FIG. 5, in the underlay sheet material 4 in which the mesh-like sheet 3 is fitted to the substrate 2, the mesh frame 31 of the mesh-like sheet 3 has the frame wall 31a of the groove wall 21a of the concave groove of the substrate 2. It is supported and fixed to. Further, since the height 31H of the mesh frame is formed longer than the length corresponding to the groove depth 21D of the concave groove, the height 31H is formed between the surface of the convex portion 22 of the substrate 2 and the artificial turf sheet 6, that is, the mesh. A void 5 is formed inside the hole 32. In the present embodiment, the groove depth 21D of the concave groove 21 is formed to be 5 mm, and the height 31H of the mesh frame is set to 13 mm. Therefore, a gap 5 having a height of about 8 mm is formed inside the mesh hole 32. There is. The lower side of the frame wall 31a of the mesh frame 31 is fitted with the concave groove 21 and supported and fixed to the groove wall 21a of the concave groove, but the upper side of the frame wall 31a is the groove depth 21D of the concave groove. Is shorter than the frame height 31H of the mesh frame, so that it is configured as a free end portion 31b that is not supported by the groove wall 21a of the concave groove.

As shown in FIG. 6, in the artificial turf structure 1 in which the artificial turf sheet 6 is laminated on such an underlay sheet material 4, when the user applies a downward force, the artificial turf sheet 6 becomes a mesh sheet 3 Since it is supported by the surface portion of the mesh frame 31 of the above, first, the mesh frame 31 of the mesh sheet 3 made of a soft foam absorbs the force, and the void 5 inside the mesh hole 32 is easily dented, so that it is natural. You can get a soft feel that absorbs force while having a little unevenness like turf. Further, since a height difference is generated between the mesh frame 31 and the gap portion 5 inside the mesh hole 32, it functions as an appropriate unevenness like natural turf, so that it does not slip easily during use and is easy to grip. Then, when a stronger force is applied downward, the force is also dispersed on the surface of the convex portion 22 of the substrate 2 arranged below the inside of the mesh hole 32, but the substrate 2 is more than the mesh sheet 3. Is also rigidly formed, so that the force is dispersed over the entire substrate 2. In the present embodiment, the mesh-like sheet 3 is formed of two foam sheets, a first foam sheet 3a on the upper side and a second foam sheet 3b on the lower side, and the hardness thereof is the first. The foam sheet 3a <second foam sheet 3b <base material 2 is selected in this order. In this way, by making the upper artificial turf sheet 6 side low hardness (soft foam) and increasing the hardness (hard foam) toward the lower foundation ground layer side, a multi-stage cushioning action is performed. And cushioning according to the magnitude of the applied force is obtained, so that the burden on the knees and hips is reduced. Since the artificial turf sheet 6 on the upper side has a low hardness (soft foam), a soft treading comfort can be obtained and an impact on the body can be reduced when the product falls. Further, even when a force in the lateral direction such as sliding is applied, the free end portion 31b at the tip of the mesh frame 31 can absorb the impact, and the cushioning property in the direction other than the vertical direction is also excellent.

Next, the artificial turf structure 10 according to the second embodiment will be described. As shown in FIGS. 7 and 8, the artificial turf structure 10 according to the present embodiment is provided with a water passage hole 25 in the substrate 2. As a result, rainwater when installed outdoors and washing water for cleaning can be drained from the upper side to the lower side of the artificial turf structure 1. In the embodiment shown in FIG. 7, a round hole penetrating in the thickness direction of the substrate 2 is provided as a water passage hole 25 at substantially the center of the convex portion 22 of the substrate 2. Since the convex portion 22 of the substrate 2 is configured to have a gap 5, water flowing from above tends to collect in this portion, but by providing the water passage hole 25, the water can be smoothly drained. The protrusion 23 formed on the back surface of the substrate 2 is formed so as to avoid the outflow portion of the water passage hole 25. As a result, the outflow portion of the water passage hole 25 does not come into contact with the floor surface, so that a gap 24 is formed between the outflow portion of the water passage hole 25 and the floor surface, and drainage is made smoother.

Further, in the embodiment shown in FIG. 8, an elliptical hole 25 penetrating in the thickness direction of the substrate 2 is provided at substantially the center of the portion where the mesh-like concave grooves 21 provided on the substrate 2 intersect with each other. It is provided as. Further, the mesh-like sheet 3 is formed so as to be located inside the mesh hole 32 without covering at least a part of the water passage hole 25 with the mesh frame 31. Therefore, as shown in FIG. 8B, since the water passage hole 25 is partially exposed at the end of the mesh hole 32, the water flowing from above is drained from the portion.

Other explanations regarding the substrate 2, the mesh-like sheet 3, and the artificial turf sheet 6 in the present embodiment are the same as in the case of the first embodiment described above, and the effects thereof are also the same.

The present invention is not limited to the above-described embodiment, and various design-modified forms within the scope of the invention described in the claims are also included in the technical scope.

1, 10 Artificial turf structure 2 Substrate 21 Concave groove 21a Concave groove wall 21D Concave groove depth 21W Concave groove width 22 Convex 23 Protrusion 24 Gap 25 Water flow hole 3 Mesh sheet 3a First Foam sheet 3b Second foam sheet 3T Sheet thickness 31 Mesh frame 31a Mesh frame frame wall 31b Free end 31H Mesh frame height 31W Mesh frame frame width 32 Mesh hole 3L Cut line 4 Underlay sheet 5 Void 6 Artificial turf sheet 61 pile 62 base cloth

Claims (6)

A substrate made of hard foam, a mesh sheet made of soft foam, and an artificial turf sheet made by planting a plurality of piles on a base cloth are laminated in this order.
On the surface of the substrate, concave grooves that can be detachably fitted to the mesh frame of the mesh-like sheet are formed in a mesh shape.
An artificial turf structure characterized in that a gap is formed between the substrate and the artificial turf sheet in the region of the mesh holes of the mesh-like sheet. The claim is characterized in that the thickness of the mesh-like sheet is substantially constant, and the thickness (T) of the mesh-like sheet is larger (T> D) than the groove depth (D) of the concave groove of the substrate. Item 1. The artificial turf structure according to item 1. The mesh-like sheet is characterized in that different types of foam sheets are laminated, and the hardness of these foam sheets constituting each layer gradually decreases toward the artificial turf sheet side. The artificial turf structure according to claim 1 or 2. The mesh-like sheet is a foam sheet having a plurality of cut lines penetrating in the thickness direction, and the cut lines are formed by pulling the foam sheet in a direction substantially perpendicular to the cut direction of the cut lines. The artificial turf structure according to any one of claims 1 to 3, wherein the artificial turf structure is a stretchable sheet configured so as to form a mesh-like sheet having a mesh hole and a mesh frame by opening. body. The artificial turf structure according to any one of claims 1 to 4, wherein the substrate is provided with a plurality of protrusions on the back surface thereof. Claims 1 to 5 are characterized in that the substrate is provided with a water passage hole penetrating in the thickness direction at a portion where the concave grooves intersect with each other or a convex portion which is a portion other than the concave groove. The artificial turf structure according to any one of the above.

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