JP2009270315A - Artificial lawn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial lawn capable of easily storing water due to temperature drop and filled with a granular bodies which do not tend to be flushed by rainwater. <P>SOLUTION: At least a part of the granular bodies of a granular body layer filled between lawn threads is formed in a short cylindrical body having a hollow section opened at both ends. Since the water such as rainwater is held by the hollow section of the short cylindrical body, the surface temperature of the artificial lawn is lowered by the vaporization heat of the held water. Since air bubbles are not contained in the peripheral wall of the short cylindrical body because the part of the granular body is formed in the short cylindrical shape. Therefore, since the density of the peripheral wall is not lowered, the short cylindrical body does not float on the water even if immersed in the water. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an artificial lawn in which granules are filled between turf yarns made of synthetic resin fibers.

  Conventionally, a large number of synthetic resin fibers were planted on the base fabric using a tufting machine, and a backing material such as rubber latex was applied to the back of the base fabric to fix the turf yarn. Artificial turf provided with a granular material layer filled with granular material such as sand between turf yarns is widely used as a surface material for various sports stadiums, and many inventions relating to this are disclosed.

  For example, Patent Document 1 discloses an artificial lawn with a filler in which an elastic filler is filled between piles planted on a base fabric, wherein the elastic filler is a foam. A man-made lawn is disclosed.

Japanese Patent Laid-Open No. 10-102415

  The artificial lawn described in Patent Document 1 can reduce the surface temperature of the artificial lawn by taking water such as rainwater into the bubbles by using an elastic filler as a foam. However, since the elastic filler is made of a foam, the specific gravity is reduced, and there is a problem that the elastic filler floats on the water when it rains a lot.

  Therefore, the present invention provides an artificial lawn filled with granular materials that are easy to store water for temperature reduction and are not easily washed away by rainwater or the like.

In order to achieve the above object, the present invention is configured as follows.
That is, the artificial lawn according to the present invention is an artificial lawn in which turf yarns are planted on a base fabric, and a granular material layer is provided by filling granular materials between the planted turf yarns. At least a part is a short cylindrical body, and both ends of a hollow portion formed along the longitudinal direction of the short cylindrical body are open.

  According to the artificial lawn according to the present invention, the short cylindrical body having the hollow portion retains water such as rainwater in the hollow portion, and thus is heated by sunlight or the like by the heat of vaporization of the retained water. The surface temperature of the artificial lawn can be lowered. In addition, since it is formed in a short cylindrical shape, the peripheral wall portion of the short cylindrical body does not contain bubbles, so the density does not decrease as in the foam, and even if the short cylindrical body is immersed in water, it floats on the water surface. Absent. In addition, since the hollow portion is formed in the short cylindrical body, the bulk density of the short cylindrical body is smaller than that of a short columnar body of the same size, and a granular layer can be formed with less material, thereby reducing the cost. Can be lowered. In addition, since the hollow portion is formed in the short cylindrical body, when an external force is applied to the short cylindrical body, the peripheral wall portion is distorted to absorb the external force so that the hollow portion is crushed. Absorbability is improved. In addition, since both ends of the hollow portion formed along the longitudinal direction of the short cylindrical body are opened, water can flow not only through the gaps between the short cylindrical bodies but also through the hollow portion as a passage. In addition, good water permeability can be obtained simultaneously with water retention.

  In addition, a cutout portion is provided in a part of the peripheral wall portion of the short cylindrical body in which the hollow portion is formed so as to extend along both ends of the peripheral wall portion along the longitudinal direction. If the part is opened, water can be taken into the hollow part not only from both ends of the short cylindrical body, but also from the notch part, and water is also retained in this notch part. Since it can be used as a gap, good water retention can be obtained. Moreover, since water can flow using this notch as a part of the passage, good water permeability can be obtained. Further, if a notch portion extending along both ends of the peripheral wall portion is provided in a part of the peripheral wall portion along the longitudinal direction, when the external force is applied to the short cylindrical body and the peripheral wall portion of the short cylindrical body is distorted, the notch Since the portion can freely move and the peripheral wall portion is easily distorted, good shock absorption can be obtained. Moreover, since the hollow part is formed in the short cylindrical body and the notch part is formed in a part of the peripheral wall part, the material located in the hollow part and the notch part is reduced, and the bulk density of the short cylindrical body is reduced. Since it becomes small and a granular material layer can be formed with less material, cost can be reduced.

  Further, if the short cylindrical body is formed in a cylindrical shape, corners are not formed on the inner peripheral wall and the outer peripheral wall of the peripheral wall portion of the short cylindrical body, so that stress is concentrated even if the peripheral wall portion is distorted due to external force. Therefore, it is preferable that the short cylindrical body is not easily broken. In addition, if the short cylindrical body is formed in a cylindrical shape, no corner is formed on the inner peripheral wall of the peripheral wall of the short cylindrical body, so that the water held in the hollow portion travels along the corner of the inner peripheral wall and passes through the hollow portion. This is preferable because the water retention of the short cylindrical body is improved because it does not flow outside and is more strongly held in the hollow portion.

  Further, if a flange-like protrusion protruding outward is formed at the end of the outer peripheral wall of the short cylindrical body, the protrusion comes into contact with the adjacent granular body in the granular layer. Since a gap is formed between the outer peripheral wall of the short cylindrical body and the adjacent granular body, water can flow using this gap as a passage, which is preferable because water permeability is improved. Further, it is preferable that water is retained in the gap formed by the protrusions, so that the water retention of the granular layer is improved.

  Further, if the short cylindrical body is mixed in all layers from the surface layer to the bottom layer of the granular body layer, the effect of improving water permeability by the short cylindrical body extends to the entire granular body layer. This is preferable because the generation of a puddle due to the stagnation of the water flow at a location with poor water permeability is suppressed.

  In addition, it is preferable to form the granular material layer only by the short cylindrical body because the effect of improving water retention and water permeability by the short cylindrical body is maximized.

  According to the artificial lawn according to the present invention, the granular material filled between the turf yarns is not easily washed away by rainwater and the like, and the surface temperature of the artificial lawn is lowered by giving the formed granular material layer good water retention. be able to.

Embodiments of the present invention will be specifically described with reference to the drawings.
1 is a cross-sectional view showing an embodiment of an artificial lawn according to the present invention, and FIG. 2 is a perspective view showing an embodiment of a short cylindrical body used in the artificial lawn according to the present invention. These are the front views which show another form of implementation of the short cylindrical body used for the artificial lawn which concerns on this invention.

  In the drawings, reference numeral 1 denotes a base layer on which an artificial lawn is laid. In this embodiment, the base layer 1 is formed by placing water-permeable asphalt concrete on the ground. However, the present invention is not limited to this. The base layer 1 may be the ground itself, and may be non-water-permeable asphalt concrete on the ground. It may be formed by, for example, driving.

  Reference numeral 2 is an artificial lawn base fabric. The base fabric 2 may be anything such as woven fabric, knitted fabric, non-woven fabric, etc. as long as it can be planted with turf yarn, and is not particularly limited, and examples thereof include a plain woven fabric made of polypropylene.

  Reference numeral 3 denotes turf yarns planted on the base fabric 2. The turf yarn 3 formed by extrusion molding of polyethylene is driven into the substrate 2 and then cut and planted in a cut pile shape. In addition, after the turf yarn 3 is planted, a backing material (not shown) is applied to the back surface of the substrate 2 to fix the turf yarn 3. In the present embodiment, polyethylene is used as the material for the turf yarn 3, but the material is not limited to this, and synthetic resins such as polypropylene, polyester, and polyamide can be suitably used.

  4 is a short cylindrical body, and 5 is a granular body. The short cylindrical body 4 and the granular body 5 are sprayed from above the turf yarn 3 planted on the base fabric 2 and then filled between the turf yarns 3 to form the granular layer 6. The granular material 5 is made to contain in the granular material layer 41 combining or combining the granular material of various materials of about 0.5 mm-5 mm according to the laying place of an artificial lawn, and its use. As an example, granules of synthetic rubber or natural rubber, granules of synthetic resin, tire pulverized material, or the like can be used as appropriate. Further, sand such as river sand and mountain sand, hard sand such as inorganic sand such as dredged sand, calcium carbonate and glass, and artificial sand and earth can be used as appropriate. In the present embodiment, the granular material layer 6 is configured by a granular material in which the short cylindrical material 4 and the granular material 5 are mixed, but may be configured by only the short cylindrical material 4. If the granular material layer 6 is formed of an elastic granular material on the upper surface of the artificial lawn, the impact absorption of the artificial lawn is improved.

FIG. 2 is a perspective view showing an embodiment of the short cylindrical body 4 according to the present invention.
In (a), the short cylindrical body 4 has a cylindrical shape, and the peripheral wall portion 41 is formed in a ring-shaped cross section in which an inner peripheral wall 43 and an outer peripheral wall 44 are concentric. In (b), the short cylindrical body has the same cylindrical shape as in (a), and a notch 46 is formed in a part of the peripheral wall 41 along the longitudinal direction at both ends of the peripheral wall 41. The portion 41 is formed in a “C” -shaped cross section. On the center side of the inner peripheral wall 43, a hollow portion 42 is provided with both ends thereof open along the longitudinal direction of the short cylindrical body 4. The notch 46 is formed so as to reach the hollow part 42, and the hollow part 42 is also opened in the notch 46. By providing the hollow portion 42, water such as rain and water spray enters and is held in the hollow portion 42, and the surface temperature of the artificial lawn is lowered by this heat of vaporization. Further, since both ends of the hollow part 42 and the notch part 46 are opened, the hollow part 42 and the notch part 46 also serve as a water passage, and excess water that cannot be held in the hollow part 42 is contained in each short cylinder. Since it flows not only through the gaps between the bodies 4 but also through the hollow part 42 and the notch part 46, the water permeability is improved. In addition, since the short cylindrical body 4 has a cylindrical shape with the hollow portion 42, the bulk density is smaller than that of a columnar granular material having no hollow portion of the same size. The granular material layer 6 can be formed.

  The short cylindrical body 4 is formed into a cylindrical shape by extruding polyethylene and extruding it into a string shape having a ring shape or a “C” -shaped cross section, and then cutting it into a short length. At this time, a filler such as calcium carbonate or talc is mixed in the polyethylene material, so that the density is 1 cubic centimeter or more per gram. By making the density of the peripheral wall portion 41 of the short cylindrical body 4 more than 1 centimeter per cubic centimeter, the short cylindrical body 4 becomes heavier than water, so that even when a large amount of rain falls and a puddle is formed, it rises It becomes difficult to be washed away. In the present embodiment, polyethylene is used as the material of the short cylindrical body 4, but the material is not limited to this, and polypropylene, polystyrene, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyethylene terephthalate, polybutylene terephthalate. , Polymethacrylate, polyacrylonitrile, ABS, AAS, phenolic resin, melanin resin, formaldehyde resin, urea resin, unsaturated polyester resin, epoxy resin, and other synthetic resins and recycled resins, olefinic and styrenic elastomers, synthetic rubber and natural Rubber, etc. can be selected or used in combination. Even in the case of using these materials, when the density of the material is 1 gram per cubic centimeter or less, the filler is mixed so as to be heavier than water.

  Since the short cylindrical body 4 has a cylindrical shape with the hollow portion 42, when an external force is applied to the short cylindrical body 4, the peripheral wall portion 41 is distorted so that the hollow portion 42 is crushed and absorbs the external force. Therefore, the impact absorbability of the granular material layer 6 is improved. Moreover, since the short cylindrical body 4 is distorted and absorbs external force as described above, the short cylindrical body is not limited to a material having elasticity such as synthetic rubber or natural rubber, but is made of a hard synthetic resin such as polyethylene or polypropylene. Even if 4 is formed, good shock absorption can be obtained. Moreover, it is also possible to adjust the magnitude | size of the elasticity obtained by selecting or combining the material of the short cylindrical body 4. FIG. Further, since the short cylindrical body 4 is formed in a cylindrical shape in which the inner peripheral wall 43 and the outer peripheral wall 44 are concentric, the thickness of the peripheral wall portion 41 is uniform, and stress is concentrated on the thin portion and is easily broken. The problem of becoming does not arise. Moreover, if the notch part 46 is formed in the surrounding wall part 41 of the short cylindrical body 4, and the surrounding wall part 41 is formed in a "C" -shaped cross section, it will receive external force to the short cylindrical body 4, and a surrounding wall part Since the notch part 46 freely moves when 41 is distorted, the peripheral wall part 41 is more easily distorted, and good shock absorption can be obtained.

  In the present embodiment, the short cylindrical body 4 is formed in a cylindrical shape in which the inner peripheral wall 43 and the outer peripheral wall 44 are concentric. However, the present invention is not limited to this, and a corner portion is formed on the inner peripheral wall 43 and the outer peripheral wall 44. May be formed into a polygonal cylindrical body. However, when the short cylindrical body 4 receives an external force and the peripheral wall portion 41 is distorted, it is more preferable that the corner portion where stress is easily concentrated is formed in a cylindrical shape that is not formed on the inner peripheral wall 43 and the outer peripheral wall 44. The cylindrical cross-sectional shape does not have to be a perfect circle, and may be an ellipse.

FIG. 3 is a front view showing another embodiment of the short cylindrical body used in the artificial lawn according to the present invention.
In the present embodiment, a flange-like protrusion 45 is formed at the end of the outer peripheral wall 41 of the cylindrical short cylindrical body 4 so as to protrude outward from the short cylindrical body 4. This is different from the embodiment. By forming the protrusion 45, the protrusion 45 comes into contact with the adjacent granular body in the granular material layer to form more gaps, so that water permeability and water retention can be further increased. In FIG. 3, (a) forms the protrusion 45 covering the perimeter of the outer peripheral wall 41 by heating the end part of the outer peripheral wall 41 and making it melt. In (b), when the synthetic resin is extruded into a cylindrical shape, and is cut into a strip shape after being elongated into a string shape, the peripheral wall portion 41 is deformed and a part of the peripheral wall portion 41 is formed on the protrusion 45. is doing.

  In FIG. 1, the short cylindrical body 4 is mixed in all layers from the surface layer to the low layer of the granular material layer 6. By mixing in this way, the effect of improving water permeability by the short cylindrical body 4 extends to the entire granular layer, so that formation of a poorly permeable layer in the granular layer is suppressed, and a puddle is generated. It becomes difficult to do.

  Moreover, if the granular material layer 6 is comprised only by the short cylindrical body 4, the effect of the water retention improvement and the water-permeability improvement by the short cylindrical body 4 will become the maximum. Moreover, if the granular material layer 6 is comprised only by the short cylindrical body 4, the granular material 5 will enter into the inside of the hollow part 42 of some short cylindrical bodies 4, and it will reduce the effect of water retention and water permeability. Such a problem does not occur.

It is sectional drawing which shows one Embodiment of the artificial lawn which concerns on this invention. It is a perspective view which shows one Embodiment of the short cylindrical body used for the artificial lawn which concerns on this invention. It is a front view which shows another form of implementation of the short cylindrical body used for the artificial lawn which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base layer 2 Base cloth 3 Turf thread 4 Short cylindrical body 41 Perimeter wall part 42 Hollow part 43 Inner peripheral wall 44 Outer peripheral wall 45 Protrusion part 46 Notch part 5 Granule body 6 Granule body layer

Claims (6)

  An artificial lawn in which turf yarn is planted on a base fabric and a granular material layer is provided by filling a granular material between the planted turf yarns, wherein at least a part of the granular material is a short cylindrical body. The artificial lawn is characterized in that both ends of a hollow portion formed along the longitudinal direction of the short cylindrical body are opened.   An artificial lawn in which turf yarn is planted on a base fabric and a granular material layer is provided by filling a granular material between the planted turf yarns, wherein at least a part of the granular material is a short cylindrical body. A part of the peripheral wall portion of the short cylindrical body is provided with a notch extending across the both ends of the peripheral wall portion along the longitudinal direction, and both ends of the hollow portion formed along the longitudinal direction of the short cylindrical body, An artificial lawn characterized by a notch opening.   The artificial lawn according to claim 1, wherein the short cylindrical body is formed in a cylindrical shape.   The artificial lawn according to any one of claims 1 to 3, wherein a hook-shaped protrusion that projects outward is formed at an end of the outer peripheral wall of the short cylindrical body.   The artificial lawn according to any one of claims 1 to 5, wherein the short cylindrical body is mixed in all layers from the surface layer to the bottom layer of the granular material layer.   The artificial lawn according to claim 5, wherein the granular material layer is formed of only the short cylindrical body.

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