JPH108413A - Joint structure of artificial lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of an artificial lawn, in which cracks and breakage of an elastic member can be prevented, and the life can be improved by reinforcing a projected part projected from the side end part of the elastic member through a stepped part, or dispensing with the formation of the projected part. SOLUTION: A projected part 3a and a projected part 3b of the adjacent artificial lawns are superposed to be joined by a Hook-and-Loop fastener 4. A reinforcing member 10 is provided on the base of the elastic member 3 by the roof part of the projected part 3a. When joining by the Hook-and-Loop fastener is released, load applied to the root part of the projected part 3a can be lessened, so as to prevent cracks and breakage caused from the root part of the projected part 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf laid in a baseball stadium or other athletic field, for example, in which a joint of an adjacent artificial turf is reinforced to prevent damage at the joint of the artificial turf. The present invention relates to an artificial turf joining structure capable of preventing breakage.

[0002]

2. Description of the Related Art Artificial turf is composed of a turf element called a pile and a base fabric on which the pile is planted.
Further, in a stadium or the like, an elastic member made of a foamed resin or the like is joined to a back surface of a base cloth, and the elastic member is laid on a base such as asphalt concrete.
Since the elastic member is interposed between the base and the base cloth, it is possible to reduce the impact on the human body even when performing intense exercise on the artificial grass.

[0003] The artificial turf composed of the pile, the base cloth and the elastic member used in the stadium has a width of, for example, 4 m.
It has a large area of about 100 m in length, and many artificial grasses are laid side by side. In this laying operation, a traveling work vehicle or the like that supports a roll on which artificial grass is wound is used.

After the artificial turf is laid side by side, it is necessary to join adjacent artificial turf to each other so that the artificial turf does not shift. Japanese Unexamined Utility Model Publication No. Hei 5-13761 discloses an artificial turf joining structure in which a staple is stapled so as to straddle a joint of an adjacent artificial turf from above, and the tip of the staple is bent at the bottom of the artificial turf. Discloses a method of joining artificial grasses together. However, in this joining method, since a part of the staple appears on the surface of the artificial turf, there is a safety problem such that a competitor gets a foot on the staple. In addition, it is effective to lay artificial grass on semi-permanently when joining with staples, but when repeating laying and winding of artificial grass according to the intended use of the place, it is effective to Work efficiency is reduced due to the necessity of removal. For this reason, in places where laying and winding are repeated several times, detachable hooking means such as hook-and-loop fasteners are provided at the side ends of the artificial grass so that the artificial grass can be easily removed. It is effective to adopt a joining structure.

FIG. 6 is a cross-sectional view showing a conventional example of a joint structure for joining artificial grasses using a surface fastener.
In the artificial turf shown in FIG. 6, an elastic member 3 made of a foamed resin or the like is joined to the back surface of the base fabric 2 on which the pile 1 is planted. On one artificial lawn to be joined, for example, a step is formed on the upper surface side of the elastic member 3 at a side end in the width direction of a 4 m dimension to form a protrusion 3a protruding laterally from the bottom side,
On the other hand, in the artificial turf, a step is formed on the bottom side of the elastic member 3 to form a protruding portion 3b protruding laterally together with the base fabric 2 from the upper surface side. The projections 3a and 3b are overlapped with each other, and a hook-and-loop fastener 14 is provided as a hooking means at a portion facing the overlap. A male fastener 14a having a hook-shaped hooking projection (male projection) is fixedly joined to the upper surface of one of the projections 3a, and a female having a loop (female loop) on the lower surface of the other projection 3b. The side fasteners 14b are joined and fixed, and the two fasteners 14a and 14b are surface-joined so that joining and separation can be repeated.

[0006]

However, as shown in FIG. 6, the elastic members 3 are provided with protrusions 3a and 3
In the case where b is formed, there is a disadvantage that the strength of the protrusions 3a and 3b is reduced. Since the base cloth 2 is bonded to the upper surface of the upper protrusion 3b, the strength is relatively high. However, the elastic member such as a foamed resin, which is not reinforced at all, is thin at the lower protrusion 3a. The strength is reduced due to the protruding structure. In particular, at the base of the protrusion 3a, that is, at the portion of the edge E at the step (the portion where the protrusion 3a is attached), the strength is extremely reduced.

Therefore, if the joining and peeling of the projections 3a and 3b are repeatedly performed at the joining portion by the surface fastener 14, a crack or the like is likely to occur in the elastic member 3 from the edge E portion. The crack gradually grows while the peeling of the surface fastener 14 is repeated, and eventually the protrusion 3 a may be cut from the elastic member 3.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to reinforce a protrusion formed from a side end of a resilient member via a step or not to form the protrusion. Another object of the present invention is to provide a joint structure for artificial turf that has a good structure, can prevent cracks and breakage of the elastic member, and can improve the life.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided an artificial turf joining structure comprising at least two or more piles having a pile, a base fabric on which the pile is planted, and an elastic member joined to the back surface of the base fabric. An artificial turf joint structure in which the artificial turf is joined on a flat surface, and a side end of one artificial turf has a step formed on the upper surface side of the elastic member and has a protrusion protruding sideways from the bottom side. A reinforcing member for reinforcing the protrusion is joined to the bottom of the elastic member, and a side end of the other artificial grass is formed with a step on the bottom side of the elastic member and projects sideways from the upper surface side. A projecting portion is formed, and the projecting portions of the two artificial grasses are overlapped and joined to each other by a detachable hooking means,

Alternatively, an artificial turf joining structure in which at least two or more artificial turf having a pile, a base fabric on which the pile is planted, and an elastic member joined to the back surface of the base fabric is joined on a plane. The side end of one artificial grass has a step formed on the upper surface side of the elastic member to form a protrusion protruding from the bottom side to the side, and the protrusion is formed on the bottom of the elastic member. The reinforcing member for reinforcement is joined, and the other artificial grass is such that the base cloth projects further to the side than the side end of the elastic member, and the protruding portion of one artificial grass and the base of the other artificial grass are formed. The cloth is overlapped and joined to each other by a releasable hooking means.

Further, the joint structure of the artificial grass according to the present invention is characterized in that at least two or more artificial grass having a pile, a base fabric on which the pile is planted, and an elastic member joined to the back surface of the base fabric, A joint structure of the artificial lawn joined on the
A reinforcing member projecting laterally from the bottom surface of the elastic member is joined to one artificial grass, and the elastic member of the other artificial grass is superimposed on the projecting reinforcing member, and the reinforcing member and the elastic member are joined together. Are joined to each other by a detachable hooking means.

The elastic member of the present invention is a foamed resin or the like, and the impact given to the base cloth is reduced by the elastic member.

[0013] In the present invention, the protruding portion protruding from the side end of the elastic member via the step is reinforced by the reinforcing member, and the reinforced protruding portion and the other elastic member or the base cloth of the artificial grass are combined. Are joined by a hooking means, or a reinforcing member is provided so as to protrude from the elastic member, and the reinforcing member and the elastic member of the other artificial grass are joined by the hooking means, as in the conventional example shown in FIG. In addition, cracks and breaks are not generated at the tang of the protrusion formed on the elastic member, that is, at the edge of the step. Therefore, the number of repetitions of joining and separation can be increased, and the life can be extended.

[0014] Further, the detachable hooking means includes:
As shown in FIG. 5, a mushroom-type (T-shaped) or T-shaped hooking projection having a head larger than the cross-sectional area of the resin fiber formed at the tip of the resin fiber (resin filament). It is preferable to stop and join. When the locking means for locking the locking projections is used, the strength in the shearing direction at the joint of the artificial grass is increased. Moreover, since the hooking force in the peeling direction is not excessive and is moderate, the peeling of the artificial grass is easy, and the force applied to the elastic member of the artificial grass becomes weak by repeating this peeling, and the elastic member Damage can be prevented and the service life can be extended.

[0015] The engaging means with which the mushroom-shaped or T-shaped engaging projections are engaged is more resistant to sand and dust than a loop-shaped one. The strength is not easily reduced. Therefore, when used in a baseball field or a stadium, it is preferable to use a hooking means as shown in FIG.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a joint of an artificial lawn showing a first embodiment of the present invention. 1 is a turf element called a pile. The pile 1 is a fiber such as a synthetic resin such as a vinylidene chloride-based resin, a polyamide-based resin, or a polypropylene-based resin. Among them, vinylidene chloride-based resin is the most preferable material having strong stiffness and excellent in water resistance and weather resistance. The pile 1 is bent into a U-shape and is implanted in the base fabric 2. The length from the upper surface of the base cloth 2 to the tip of the pile 1 is about 13 mm.

The base fabric 2 for supporting the pile 1 is formed by weaving a synthetic resin fiber such as a polypropylene resin or a polyethylene terephthalate resin into a stitch shape as shown in FIG. And the pile 1 is
The stitches A and B of the base fabric 2 are attached so as to be bundled. Normally, the number of piles 1 woven in a pair of stitches A and B is about ten and several. After the pile 1 is planted on the base fabric 2, an adhesive resin called a backing resin is coated from the back side of the base fabric 2, so that the pile 1 is fixed so as not to come off.

The elastic member 3 is formed of an elastic material such as foamed resin or rubber so as to have a sheet-like or porous structure. In the present invention, as the material of the elastic member 3, a foamed vinyl chloride resin having a thickness T of about 16 mm is used. A foamed vinyl chloride resin is preferably used because it is lightweight and excellent in flexibility and the like. In addition, a foamed urethane resin may be used as another resin material. By using such an elastic member 3 made of resin or rubber, it is possible to reduce the weight burden on the foot when a person stands on the artificial turf. The elastic member 3 is adhered to the back surface of the base cloth 2 by an adhesive 6. The width of the artificial grass is 4 m, for example, and the length is 100 m, for example.
m.

In FIG. 1, both ends of the two artificial grasses in the width direction of 4 m are joined to each other, but at the left end of each artificial grass shown in the figure, a step is formed on the upper side of the elastic member 3. (A) is formed, and a protruding portion 3a is formed so as to protrude from the bottom side to the side.
A step (b) is formed on the bottom side of the elastic member 3, and a protrusion 3b is formed to protrude from the upper side. In all the artificial grass laid side by side, the protruding portion 3a is formed at the left side end and the protruding portion 3b is formed at the right side end. Step joining of the protruding portions 3a and 3b as shown in FIG.

The protruding portions 3a and 3b are formed by cutting both ends of the elastic member 3 into a substantially rectangular shape using an electric cutter equipped with a circular saw blade in an electric motor. The lengths La and Lb of the protruding portions 3a and 3b in the protruding direction are both equal to about 50 mm. Or dimension L
a is formed slightly longer than Lb. By forming the dimension La equal to or slightly longer than Lb, the upper protruding portion 3b can be prevented from being bent or mountain-folded on the protruding portion 3a. Dimension La to Lb
If it is longer, it is preferable that the dimensional difference is about 2 mm at the maximum. If the dimension La is longer than Lb, when the projections 3a and 3b are overlapped and joined together, the distance between the joining end of the projection 3b and the joining end serving as the inner surface of the step (a) is increased. There is a gap, but this gap is up to 2m
If it is about m, the gap is hidden by the pile 1, and there is no practical problem. However, if the difference between La and Lb is too large, there is a concern that a spike of the athletic shoe is caught in the gap between the joint end surfaces, and the difference between the dimensions La and Lb may be 2 mm or less. preferable.

A hook-and-loop fastener 4 is provided at the joint between the projections 3a and 3b as hooking means that can be peeled off. One fastener 4a is adhesively fixed to the upper surface of the protrusion 3a by an adhesive 7, and the other fastener 4b to be hooked to the fastener 4a is adhesively fixed to the lower surface of the other protrusion 3b by the adhesive 7. Have been.

FIG. 5 shows the surface fastener 4 in an enlarged manner. In this example, both fasteners 4a and 4b are both made of resin fibers (resin filaments) on base material 4c or 4d.
Are formed to protrude. The distal end of the resin fiber is subjected to a heat treatment to integrally form a hemispherical head 4e or 4f larger than the cross-sectional area of the resin fiber, thereby forming a mushroom type (mushroom type) engaging projection. Then, the bases 4c and 4d are respectively bonded to the protrusions 3a by the adhesive 7.
And 3b.

When the fastener 4a and the fastener 4b are joined, the mushroom-type (mushroom-type) engaging projections are engaged with each other. When this engaging means 4 is used, the shearing direction at the joint of the artificial grass is used. The strength of is increased. In addition, since the engaging force in the peeling direction does not become excessive, peeling of the artificial grass is easy, and the force applied to the elastic member 3 of the artificial grass becomes weak due to repetition of the peeling, thereby damaging the elastic member 3. Can be prevented and the life can be extended. The mushroom-type (mushroom-type) hooking projections 4 are more resistant to sand and dust than the loop-shaped one shown in FIG. Hateful. Therefore, it is suitable for use in baseball fields and stadiums.

The thickness of the surface fastener 4 in a state where the fastener 4a and the fastener 4b are joined is 5 mm.
The total thickness of the thickness of the surface fastener 4 and the height Ta of the protrusion 3a and the height Tb of the protrusion 3b is equal to the thickness T of the elastic member 3.
Each step (a) and (b) so that they are almost the same as 16mm
Is set. In the example shown,
Although the hook-and-loop fastener 4 provided with a mushroom-shaped hooking projection is used as the hooking means 4, any hooking means may be used as long as it can be peeled off. For example, a concave hole is formed in one protrusion 3a, and the other protrusion 3a is formed.
b may be provided with a projection having a head to be fitted in the hole, and the projections 3a and 3b may be joined by the concave and convex fitting.

As described above, since the hooking means such as the hook-and-loop fastener 4 is used as the joint structure of the artificial grass,
The artificial grass can be removed smoothly and easily, which is advantageous when laying and winding are repeated. The base cloth 2 is joined to the upper surface of the protrusion 3b shown in FIG. 1 to maintain the strength, but the strength of the other protrusion 3a is weak because the thickness Ta is small. . Therefore, in the configuration shown in FIG. 1, the reinforcing member 10 is bonded and fixed to the lower surface of the protruding portion 3 a by the adhesive 11.

The reinforcing member 10 has a tape shape and is made of a resin-impregnated polyester woven fabric containing a flame-retardant synthetic resin such as a vinyl chloride resin or a polyurethane resin. The width W of the reinforcing member 10 is 30 to 200 mm.
It has a length of about 0.1 to 3 mm over the entire length of the artificial grass in the length direction (for example, 100 m; a direction perpendicular to the paper surface). In the case shown in FIG. 1, when the protrusion length La of the protrusion 3a is 50 mm, the width W of the reinforcing member 10 is preferably about 100 mm, and the edge 10a of the reinforcing member 10 in the width direction is preferably used. Is the protrusion 3
It is preferable that the edge portion (a) of the stepped portion (a) (the buckling portion of the protruding portion 3a) E be located near the center of the width dimension W of the reinforcing member 10. . The thickness T of the elastic member 3 is 16 mm.
In this case, the thickness of the reinforcing member 10 is preferably about 1.0 mm or less in order not to form a large step at the bottom of the elastic member 3.

In the joint structure of artificial grass shown in FIG. 1, when winding up the artificial grass once laid, when the hook-and-loop fastener 4 is peeled off, the joint 3 (edge) E of the protruding portion 3a is removed. Even if the stress is concentrated, since the fastening portion is reinforced by the reinforcing member 10, no extreme bending occurs at the fastening portion E of the projection 3a, and the elastic member 3 is less likely to crack. Even if a crack occurs in the elastic member 3 at the edge E, the main body portion of the elastic member 3 and the protruding portion 3a continue to be connected by the reinforcing member 10, so that the protruding portion 3a There is no separation from the main body.

In order to sufficiently reinforce the projection 3a, the reinforcing member 10 must have a tensile strength of 100.
kg · f / 50 mm width, preferably not less than. Alternatively, an adhesive layer may be provided on the lower surface of the reinforcing member 10 to adhere the reinforcing member 10 to the surface of a base such as asphalt concrete. Therefore, damage due to repeated joining and peeling of the artificial turf is prevented, and the life can be extended.

FIG. 2 is a sectional view showing a joint structure of an artificial lawn according to a second embodiment of the present invention. In this example, the elastic member 3 is provided at the right side end of the artificial grass in the drawing.
The base cloth 2 supporting the pile 1 is not formed with a step.
Project from the upper surface of the elastic member 3 rightward in the figure. The protruding length Lc is, for example, 50 mm, and the length is
The protruding length La of the protruding portion 3c formed on the left side in the drawing of each artificial grass is equal to or shorter than the protruding length La. That is, the dimension La is 0 to 2 more than Lc.
It is longer in the range of mm. One fastener 4b constituting the hook-and-loop fastener 4 is fixed by an adhesive 7 to the lower surface of the base cloth 2 projecting from the elastic member 3 to the right side in the figure.

At the left side end of each artificial lawn in the figure,
A shallow step (c) is formed on the upper side, and a projecting portion 3c projecting laterally from the bottom side is formed. The other fastener 4a constituting the surface fastener 4 is formed on the upper surface of the projecting portion 3c.
Are adhesively fixed. Thickness Tc of this protrusion 3c
Is larger than the thickness Ta of the protrusion 3a shown in FIG. 1, and the size obtained by adding the thickness of the surface fastener 4 (about 5 mm) and the thickness Tc of the protrusion 3c is the thickness of the elastic member 3. The length T substantially coincides with the length T. The reinforcing member 10 is bonded and fixed to the bottom surface of the elastic member 3 at the portion where the protrusion 3c is formed by the adhesive 11. The reinforcing member 10 is the same as that described with reference to FIG. 1, and the edge 10 a is joined so as to coincide with the side end of the protruding portion 3 c, and the edge E of the step (c) is set to the width It is located almost at the center of the direction.

In the example shown in FIG. 2, the thickness Tc of the projection 3c can be made larger than the thickness Ta of the projection 3a shown in FIG. 1, so that the strength of the projection 3c is increased. In addition, it is not necessary to form a step (b) as shown in FIG. 1 at the right side end portion of each artificial turf as shown in FIG. 1 and the base cloth 2 may be simply protruded. Work is not required, and the production cost of artificial grass can be reduced. In addition, since the buckled portion of the protrusion 3c is reinforced by the reinforcing member 10, even if the number of times of joining and peeling of the surface fastener 4 is increased, the buckled portion of the protrusion 3c is less likely to be damaged. Life extension can be realized.

FIG. 3 is a partial sectional view showing a joint structure of an artificial turf according to a third embodiment of the present invention. In FIG. 3, no step is formed in the elastic member 3 at the left side end portion of each artificial grass in the drawing, and the same reinforcing member as shown in FIGS. 10 is adhesively fixed by an adhesive 11. This reinforcing member 10
The elastic member 3 protrudes laterally from the left side end portion by a length Ld, and one fastener 4 a constituting the surface fastener 4 is bonded to the adhesive 7 on the upper surface of the protruding reinforcing member 10.
Is fixed.

At the right side end of each artificial lawn in the figure,
A shallow step (d) is formed at the bottom of the elastic member 3, the protrusion 3 d is integrally formed, and the other fastener 4 b constituting the surface fastener 4 is bonded and fixed to the lower surface of the protrusion 3 d with an adhesive 7. Have been. Projection dimension L of projection 3d
The relationship between b and the protrusion length Ld of the reinforcing member 10 is as follows:
It is preferable that both have the same size of about 50 mm, or that Ld is slightly shorter than Lb. By making Ld shorter than Lb, it is possible to prevent the reinforcing member 10 from being bent at the lower surface of the protrusion 3d. The total dimension of the thickness (about 5 mm) of the hook-and-loop fastener 4 in the joined state and the thickness Td of the protrusion 3 d substantially coincides with the height T of the elastic member 3.

In the example shown in FIG. 3, the protrusion 3a shown in FIG.
And the protrusion 3c shown in FIG. 2 is not formed, the edge E due to the step does not exist. Therefore, there is no fear that a crack or the like is formed at the edge E of the elastic member 3 due to the repeated peeling of the surface fastener 4. That is, the strength of the reinforcing member 10 is related to the peeling of the surface fastener 4, and the reinforcing member 10 is formed of a sufficiently strong material, thereby causing damage due to the peeling of the surface fastener 4. Absent. Further, since the upper surface of the other protruding portion 3d is reinforced by the base cloth 2, the protruding portion 3d is less likely to be damaged by peeling of the surface fastener 4.

[0035]

According to the present invention described in detail above, when joints of artificial grass are joined by hooking means such as hook-and-loop fasteners, even if joining and peeling are repeated, damage or cracking of the elastic member occurs. It becomes difficult. Therefore, the number of repetitions of joining and peeling can be increased, and the life can be extended.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a joint structure of an artificial turf showing a first embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a joint structure of an artificial turf showing a second embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of a joint structure of an artificial grass according to a third embodiment of the present invention;

FIG. 4 is an enlarged view showing a pile and a base fabric of the artificial grass,

FIG. 5 is an enlarged front view showing a hook-and-loop fastener as an example of a hooking means;

FIG. 6 is a partial cross-sectional view showing a conventional artificial grass joining structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile 2 Base cloth 3 Elastic member 3a, 3b, 3c, 3d Projection part 4 Surface fastener 4a Fastener 4b Fastener 10 Reinforcement member (a) (b) (c) (d) Step

Claims (3)

[Claims] 1. A pile, a base fabric on which the pile is planted,
An artificial turf joining structure in which at least two or more artificial turf having an elastic member joined to a back surface of a base cloth are joined on a plane, and one side edge of the artificial turf is an upper surface of the elastic member. A step is formed on the side and a protrusion protruding laterally from the bottom side is formed, and a reinforcing member for reinforcing the protrusion is joined to the bottom of the elastic member, and the side end of the other artificial grass is A step is formed on the bottom side of the elastic member to form a protrusion protruding laterally from the upper surface side, and the protrusions of both artificial grasses are overlapped and joined to each other by a detachable locking means. An artificial grass joint structure characterized by the following. 2. A pile, a base fabric on which the pile is planted,
An artificial turf joining structure in which at least two or more artificial turf having an elastic member joined to a back surface of a base cloth are joined on a plane, and one side edge of the artificial turf is an upper surface of the elastic member. A step is formed on the side and a protrusion protruding from the bottom side to the side is formed, and a reinforcing member for reinforcing the protrusion is joined to the bottom of the elastic member, and the other artificial grass is the base cloth, The protruding portion of one of the artificial turf and the base cloth of the other artificial turf are overlapped with each other and are joined to each other by a releasable locking means. An artificial grass joint structure characterized by the following. 3. A pile, a base fabric on which the pile is planted,
An artificial turf joining structure in which at least two or more artificial turf having an elastic member joined to a back surface of a base cloth are joined on a plane, and one artificial turf is laterally connected to a bottom surface of the elastic member. The elastic member of the other artificial grass is overlapped on the protruding reinforcing member, and the reinforcing member and the elastic member are joined to each other by a detachable hooking means. An artificial grass joint structure characterized by the following.