JP6333647B2 - Artificial grass structure - Google Patents

Description

The present invention relates to a synthetic grass structure, and more particularly, to a low permeability or impermeable base on soil type, etc., to a technique for laying artificial turf to ensure drainage.

  Artificial turf (especially artificial turf with a filler) is placed on clay-coated or non-permeable permeable ground that does not have drainage performance, such as a soil-type ground sprayed with cement emulsion. When laying, excavate the existing earth and sand, install underdrains, etc., then construct a crushed stone layer and an asphalt concrete layer in order as drainage and aeration layer, lay artificial turf on it, and lay between the piles Filled with granular materials such as sand and rubber chips.

  However, according to this old construction method, not only the disposal cost of earth and sand is incurred, but also it takes a considerable time to complete the construction.

  When laying artificial turf with fillers on the low-permeability or non-permeable subsurface without such effort, the artificial turf floats from the base to the floating water flow due to heavy rain when a typhoon arrives, for example. It may get out of the way and the filler may be washed away. In such a situation, the artificial turf must be peeled off after removing the filler, and the groundwork must be adjusted and laid again.

  As such a countermeasure, for example, Patent Document 1 discloses that a water permeable hole is formed in the base fabric of the artificial turf, and concrete is placed on the upper surface of the base on which the artificial turf is laid to make the base non-permeable. It has been proposed to ensure drainage by a simple structure in which a drainage groove is provided on the surface layer of the water to allow rainwater or water sprayed to flow through the drainage hole to the drainage groove.

  However, according to such a drainage structure, there is a possibility that dust, fillers, and the like that have flowed out from the water-permeable holes of the artificial turf as the rainwater flows will accumulate in the drainage grooves and the drainage capacity will be reduced. Moreover, since the drainage groove itself does not take a rigid structure, there is a risk of inducing uneven settlement, cracking of the ground, or buckling. Furthermore, since the drainage grooves are formed by the concrete cutter, a work burden is imposed on the construction worker.

  As another drainage technique, there is a method of providing a crushed stone layer as a water-permeable and ventilated layer on a non-permeable base layer, and laying artificial grass on it directly or through a nonwoven fabric, but the drainage gradient on the surface of the base layer If there is not enough water, or if the drainage distance is long, the drainage capacity will not catch up, and the artificial turf foundation will be pushed up by the reverse flow phenomenon of rainwater that has penetrated into the lower layer through the artificial turf. There is a problem that occurs.

  Also, if the artificial turf laying surface has poor drainage, the pressure of water vapor generated as the temperature rises causes an air pocket called an air pillow partially between the artificial turf base fabric and the ground surface, This swelling of the air may cause unevenness on the artificial turf surface.

  By the way, the artificial turf used for a long period of time has a considerably reduced texture and feeling of use compared to the initial stage due to wear of the pile tip, firming of the filler, and the like. Therefore, it is necessary to replace artificial turf that has expired with new artificial turf. However, there is a problem that the removed artificial turf must be treated as industrial waste.

  Therefore, Patent Document 2 proposes that an existing old artificial turf is left as it is as a base layer and a new artificial turf is laid thereon. In many cases, artificial turf applied to athletics facilities such as soccer fields and tennis courts is artificial turf with a filler filled with granular materials between piles.

  If the filled granular material is a hard granular material such as sand (mesh), correct the uneven part that occurred in the existing old artificial turf eye sand layer to the same level as the surrounding sand layer, Alternatively, a new ground sand is added to correct the level, and a hard undercoat layer is obtained by applying a coating agent (a binder as a binder) that prevents the movement of the ground sand layer to harden the ground sand layer. New artificial turf can be laid.

  After that, the artificial turf itself has been improved in various aspects. In recent years, the pile length (the length from the surface of the base fabric to the tip) that gives a texture and feel closer to that of natural turf is 30- Long pile artificial turf as long as 80 mm is preferably employed.

  In the case of long pile artificial turf, usually, the particulates are filled between the piles so that the protruding length of the pile (the length from the surface of the filler layer to the pile tip) is about 10 to 30 mm. However, since the granular materials to be filled include elastic granular materials such as rubber chips, it is difficult to ensure flatness suitable as a base for newly laid artificial grass.

  In addition, the pile protrusion length from the filler layer is in the way, and it is difficult to fix the filler layer because the coating agent that prevents the movement of the granular material cannot be sufficiently applied to the granular material. . Furthermore, the new artificial turf laid on the tip of the pile protruding from the filler layer may be pushed up irregularly.

  For this reason, when the existing old artificial turf is a long pile artificial turf with a filler, there is a problem that the newly laid artificial turf is likely to be uneven.

  Also, in terms of performance, the existing long pile artificial turf contains elastic granular materials such as rubber chips as its filler, so when a new artificial turf containing elastic granular materials is laid on it, It may be too soft and excessively low elasticity, making it unsuitable for sports play, for example, a soccer ball or tennis ball will not jump. Another problem is that when the player steps on the turf surface, the turf surface is greatly deformed and the foot is buried.

  For water permeability (drainage), the filler in existing artificial turf (especially in the case of mesh sand) is stepped and solidified by the player and applied before laying new artificial turf. Since the initial water permeability is almost lost by the agent, the artificial turf that has been laid is uneven as in the case of laying the artificial turf on the above-mentioned non-permeable or non-permeable ground. There is a problem that it is easy.

In addition, as described in Patent Document 3, a stock solution or a diluted solution of a coating agent (for example, a resin material such as an asphalt emulsion or urethane) that fixes a granular material filled in an existing artificial turf, By spreading or applying to the filler at about 100 to 1000 g / m ² , it is possible to impart water permeability to the existing artificial turf as the foundation layer.

However, workability is not so good because the curing and leaving time for drying and curing the coating agent requires a long time. Moreover, there exists a problem that a coating agent is made into about 100-1000 g / m < ² > per unit area as mentioned above, and spreading | dispersing or apply | coating itself places a labor burden on an operator. This problem can be said particularly when the existing artificial turf is a long pile artificial turf as described above.

JP 2012-47001 A Japanese Patent No. 2533028 Japanese Patent No. 29997879

  Therefore, the problem of the present invention is that even if artificial turf is laid on the ground of poorly permeable or non-permeable, or new artificial turf is laid on existing artificial turf, The purpose of this method is to obtain good drainage by a suitable method.

In order to solve the above-described problems, the first invention of the present application is that an artificial turf with a filler formed by filling granular materials between piles is laid on an underwater-permeable or non-water-permeable ground material made of a soil system. The artificial turf structure, comprising: a crushed stone layer provided on the base; and a drainage filter including a drainage tube in a fiber sheet base material as a drainage layer disposed on the crushed stone layer, The artificial turf with filler is laid on a filter, and the crushed stone layer has a drainage gradient on the surface layer, and a drainage side groove is provided at the lower end side of the drainage gradient and on the side of the artificial turf laying surface. The end of the drainage filter is drawn out from the lower end side of the drainage gradient and enters the drainage side groove .

  In the first aspect of the invention, it is preferable that the crushed stone layer and the drainage filter are partially and integrally joined by a predetermined binder.

  As a more preferable aspect, it is preferable that the artificial grass with a filler and the drainage filter are joined together with a predetermined binder.

  As a preferred construction method, the artificial turf structure according to the first invention is provided with a crushed stone layer on the base, and after rolling the crushed stone layer and smoothing the surface thereof, drainage is applied to the crushed stone layer. It can be constructed by disposing a drainage filter including a drainage tube on a fiber sheet substrate as a layer, disposing an artificial turf on the drainage filter, and filling the granular material between piles of the artificial turf.

In order to solve the above-mentioned problem, the second invention of the present application is to leave the existing artificial grass with filler filled with granular materials between piles as a base layer, and to provide the existing artificial grass with filler. In the artificial turf structure in which a new artificial turf is laid on the base material layer provided on the existing artificial turf with filler, and a fiber as a drainage layer disposed on the basic material layer A drainage filter including a drainage tube in a sheet base material, and the new artificial turf is laid on the drainage filter,
The foundation material layer is formed by a crushed sand layer that has been tamped smoothly by rolling pressure and a binder applied on the crushed sand layer, and the foundation material layer has a drainage gradient, A drainage side groove is provided at the lower end side of the artificial turf laying surface, and an end of the drainage filter is drawn from the lower end side of the drainage gradient and enters the drainage side groove .

  In the second aspect of the present invention, a crushed sand layer having a predetermined thickness, which is tamped by rolling pressure, is formed on the existing artificial grass with a filler, and the crushed sand layer and the drainage filter are provided with a predetermined binder. It is preferable that the parts are integrally joined together.

  As a more preferable aspect, it is preferable that the new artificial turf and the drainage filter are joined by a predetermined binder.

  As a preferred construction method, the artificial turf structure according to the second aspect of the present invention is provided with a crushed sand layer on the existing artificial turf filled with filler, and squeezed smoothly by rolling, and a predetermined binder is applied. After forming the base material layer, a drain filter including a drain tube is placed in the fiber sheet base material as the drain layer on the base material layer, and the new artificial grass is laid on the drain filter. Can be built by.

  According to the first invention of the present application, when an artificial turf is laid on an underwater or non-water-permeable ground consisting of a soil system, a crushed stone layer (preferably, a surface is smoothed by rolling pressure). A simple construction method that simply disposes a drainage filter including a drainage tube in a fiber sheet base material as a drainage layer on top of the crushed stone layer). It is possible to obtain an artificial turf structure in which unevenness due to swelling or the like does not occur in the artificial turf on the surface layer.

  Further, according to the second invention of the present application, the existing artificial grass with filler filled with particulate matter between the piles is left as it is as a base layer, and a new artificial artificial grass is placed on the existing artificial grass with filler. In laying the turf, it is preferable to provide a crushed sand layer on an existing artificial turf with a filler and squeeze it smoothly by rolling, and after applying a predetermined binder to form a base material layer, the above base material By arranging a drainage filter including a drainage tube in the fiber sheet base material as a drainage layer on the layer, even if the existing artificial turf is a long pile artificial turf with a long turf length, it is newly laid The flatness and elasticity of the artificial turf (filled artificial turf) will not be impaired, and the drainage will be good, so the newly laid artificial turf will not cause unevenness due to swelling, etc. An artificial turf structure can be obtained

The typical sectional view showing a part of artificial turf structure concerning a 1st embodiment of the present invention. Sectional drawing along the AA line of FIG. The schematic diagram which isolate | separates and shows the main components of the artificial turf structure which concerns on the said 1st Embodiment. The typical sectional view showing a part of artificial turf structure concerning a 2nd embodiment of the present invention. The schematic diagram which isolate | separates and shows the main components of the artificial turf structure concerning the said 2nd Embodiment. The typical perspective view which shows the drainage filter used by the said 1st, 2nd embodiment.

  Next, the first and second embodiments of the present invention will be described with reference to FIGS. 1 to 6, but the present invention is not limited thereto.

(First embodiment)
First, an artificial turf structure 1A according to a first embodiment of the present application will be described with reference to FIGS. This artificial turf structure 1A is characterized in that an artificial turf (artificial turf with a filler) 50 is laid on a base 10 via a drainage filter 40. In the following description, the artificial turf 50 laid on the drainage filter 40 may be referred to as “surface artificial turf”.

  In the first embodiment, the base 10 is covered with clay such as clay coat, or the surface is coated with a cement emulsion or the like. It is a pavement foundation 110 such as an earth-based ground that is substantially impermeable to water.

  With reference to FIG. 6, the drainage filter 40 is a drainage filter formed in a flat shape formed by inserting a drainage pipe 42 into a fiber sheet base material 41. Although the woven fabric may be sufficient as the sheet | seat base material 41, it is preferable that it is a nonwoven fabric from a water collecting viewpoint. In this embodiment, the sheet base material 41 is a belt-like body having a width of 100 mm and a length of 50 m.

  Further, the drain pipe 42 is a mesh tube having a water permeability that is difficult to crush, for example, a polyester monofilament knitted into a tubular shape (hereinafter, the drain pipe is referred to as a “drain pipe”). In this embodiment, the drain tube 42 is a mesh tube, but the drain tube 42 has a large number of drain holes on the pipe wall, and has a structure in which water penetrates from the outside to the inside through the drain hole. A perforated tube or the like may be used.

  When the sheet base material 41 is a belt-like body as described above, the drainage tube 42 is inserted along the length direction, but the inner diameter of the tube and the insertion interval with respect to the sheet base material 41 depend on the specifications. It may be determined as appropriate. In this embodiment, five drainage tubes 42 having an inner diameter of 4 mm are inserted into a sheet base material 41 having a width of 100 mm at intervals of 30 mm.

  This type of drainage filter 40 effectively promotes drainage of rainwater by the water collecting effect of the nonwoven fabric constituting the sheet base material 41 and the water passing effect of the drainage tube 42.

The nonwoven fabric constituting the sheet base material 41 may be formed from synthetic resin fibers such as polyethylene, polyethylene terephthalate, polypropylene, nylon, etc., but considering the frictional resistance against the artificial artificial grass 50, the strength of the nonwoven fabric itself, workability, price, etc. And it is preferable that the amount per unit area is 50-150 g / m < ² >.

That is, if the basis weight is less than 50 g / m ² , the load may be deformed or torn due to a load generated during laying work or between the surface artificial grass 50. On the contrary, if the basis weight exceeds 150 g / m ² , the thickness of the sheet base material 41 itself becomes too large, and the stability during the work of laying the artificial turf 50 is impaired. Since it becomes difficult to uniformly fill the granular material and unevenness tends to occur in the finish of the filler, it is not preferable.

  According to the first embodiment, when the drainage filter 40 is laid on the pavement foundation 110, the crushed stone layer 20 is provided on the pavement foundation 110 in advance.

  The thickness of the crushed stone layer 20 varies depending on the drainage performance and the role as the base adjustment layer, the construction area, the base gradient, the necessity of the frost heave suppression function, etc., but the thickness is 30 to 500 mm, preferably 50 to 200 mm. It is preferable to cast and uniformly taminate with a rolling roller, rammer, or the like.

  The crushed stone layer 20 is given a predetermined drainage gradient. As a method of providing a drainage gradient, it is preferable to form a drainage gradient on the pavement foundation 110 so that the crushed stone layer 20 has a uniform thickness and is formed in parallel with the drainage gradient. A drainage gradient may be added to the surface. In the first embodiment, the drainage gradient is about 2% downward in FIG.

  The drainage filter 40 may be laid on the entire surface of the crushed stone layer 20. However, if the drainage filter 40 has sufficient drainage capacity for the normally expected rainfall falling on the artificial turf 50, it should be installed at intervals. May be.

  For example, as described above, if the width is 100 mm and five drainage tubes 42 are inserted in the width, even if the drainage filter 40 is installed every 500 mm, extremes such as concentrated heavy rain caused by a typhoon Sufficient drainage performance can be secured except in case of heavy rainfall.

  In installing the drainage filter 40 on the crushed stone layer 20, it is preferable to apply the binder 30 in a streak shape or a dotted shape (island shape) so that the drainage filter 40 is in close contact with the crushed stone layer 20 and integrated. For the binder 30, a coating agent (for example, a one-component moisture-curing urethane resin) applied to the surface layer of the filler is used in the artificial turf with filler to prevent the movement of the granular material as the filler. can do.

  As another aspect, the drainage filter 40 may be bonded to the back side (backing material 53) side of the artificial turf 50 newly laid through the binder 30. The drainage filter 40 may be bonded to either one or both of the crushed stone layer 20 and / or the artificial turf 50.

  Moreover, as shown in FIGS. 1 and 3, a drain side groove 60 is formed by excavation on the lower end side (the right end side in FIGS. 1 and 3) of the drainage gradient around the artificial grass laying surface, and the drainage filter 40 is provided. It is preferable to draw out from the artificial turf laying surface and enter the drainage side groove 60. Only the drainage tube 42 may be pulled out from the artificial turf laying surface and placed in the drainage side groove 60.

  According to this, in a state where water is saturated such as when it rains, the water contained in the drainage filter 40 can always flow down toward the drainage side groove 60 through the drainage tube 42. Further, steam generated when the moisture contained in the crushed stone layer 20 and / or the pavement foundation 110 evaporates is released outside through the drainage tube 42, so that the artificial turf base cloth and the foundation surface are separated. Air pillows are prevented from occurring between them. As a result, it is possible to suppress these strength reductions, uneven settlement due to the occurrence of water supply, occurrence of unevenness, and the like.

  An artificial turf 50 as a surface layer is laid on the drainage filter 40. The artificial turf 50 has synthetic resin piles (turf leaves) 52 planted on the base fabric 51 at predetermined intervals, and a backing material (on the back of the base fabric 51 for preventing the planted pile 52 from falling off). The artificial turf provided with the backing material 53 may be an artificial turf with a filler in which the granular material 54 is filled with a predetermined thickness between the piles 52 after laying.

  According to the first embodiment, the crushed stone layer 20 that is preferably squeezed flat by rolling is provided on the pavement foundation 110 such as a soil-based ground that is hardly water permeable or water impermeable. The drainage filter 40 is placed on the drainage filter 40, and the artificial turf 50 is laid on the drainage filter 40. The rainwater that permeates the lower layer through the artificial turf 50 passes through the drainage filter 40 along a predetermined drainage gradient. Can be drained.

  Moreover, even if rainwater that has flowed and accumulated in the crushed stone layer 20 evaporates as the temperature rises, the water vapor is discharged out of the artificial turf laying surface through the drainage filter 40. A pool (air pillow) cannot be formed, and the surface artificial turf 50 laid does not cause unevenness due to swelling or the like.

  In addition, although it is preferable that the drainage filter 40 is arrange | positioned at the upper part of the crushed stone layer 20, the drainage filter 40 is arrange | positioned under the crushed stone layer 20 on the condition that the drainage tube 42 is not crushed at the time of construction of the crushed stone layer 20. Such an embodiment is also included in the present invention.

  In order to prevent rainwater from staying on the artificial turf 50, it is preferable that the backing material 53 is applied to the back surface of the base fabric 51 and then water-permeable holes are formed in the base fabric 51 at predetermined intervals.

  In consideration of the recyclability of the artificial turf 50, the base fabric 51 and the pile 52 are preferably made of a thermoplastic resin such as polypropylene, polyethylene, and nylon, particularly low-density polyethylene having good meltability.

(Example of the first embodiment)
Next, Examples 1.1 to 1.4 according to the first embodiment and Comparative Examples 1.1 to 1.3 will be described.

About [Underlying base layer]
First, as a common item for the Examples and Comparative Examples, the crushed stone layer (RC-) was formed on a non-permeable pavement base made of an earth system adjusted to have a drainage gradient of 2% of the single gradient and sufficient pressure resistance performance. 40) was uniformly leveled to a thickness of 50 mm and then rolled using a dedicated rolling device to form a base layer. The area of the ground base layer was about 50 m long x about 70 m wide, and the drainage gradient of the crushed stone layer was a 2% single slope along the length direction, similar to the pavement ground. In addition, a U-shaped drainage side groove having a depth of 30 cm and a width of 25 cm was formed along three sides excluding the upstream side edge of the base base layer, and drained by a pipe from a water collecting tank. This base base layer is 50 m long × 10 m wide, and is divided into a total of 7 sections. In each section, the artificial turf structures of Examples 1.1 to 1.4 and Comparative Examples 1.1 to 1.3 are placed. Provided.

About [drainage filter]
In Examples 1.1 to 1.4 and Comparative Example 1.3, as a drainage filter, a drainage tube comprising a nonwoven fabric sheet having a width of 100 mm × a length of 50 m and a mesh tube having an outer diameter of φ7 mm (inner diameter φmm) × 50 m. A drainage filter in which 5 wires were embedded at intervals of 30 mm was adopted. In addition, when connecting a drainage filter in parallel (parallel), the edge parts of the nonwoven fabric were welded with the simple gas burner.

About [Evaluation of drainage]
Each example and each comparative example were left as an exposure test for 2 months after construction, and after raining, the presence or absence of surface unevenness, the surface condition of the filler after 2 hours of rainfall, the occurrence of surface water pools Four items were evaluated: presence / absence and presence / absence of surface swelling.

Example 1.1
A drainage filter is placed on the entire surface of the first section (length 50m x width 10m) of the crushed stone layer from the upstream side of the single gradient to the downstream side, and long pile artificial grass (made by Sumitomo Rubber Co., Ltd., trade name Hybrid Turf XP) −50: lawn height 50 mm) was laid, and between the piles, silica sand and tire pulverized products were filled in a total of about 28 kg / m ^{2 as} fillers.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

Example 1.2
A drainage filter with a width of 100 mm and a length of 50 m and a non-woven fabric with a width of 100 mm and a length of 50 m are alternately arranged in the second section (length 50 m × width 10 m) of the crushed stone layer, respectively, from the upstream side to the downstream side of the single gradient. On top of that, long pile artificial turf (trade name Hybrid Turf XP-50: lawn length 50 mm) manufactured by Sumitomo Rubber Co., Ltd. was laid and silica sand and tires were used as fillers between the piles. A total of about 28 kg / m ² of pulverized products was filled.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

Example 1.3
In the third section of the crushed stone layer (length 50 m x width 10 m), a drainage filter having a width of 100 mm and a length of 50 m is arranged from the upstream side to the downstream side of the single gradient with an interval of 100 mm. As in 1.1, long pile artificial grass (manufactured by Sumitomo Rubber Co., Ltd., trade name Hybrid Turf XP-50: lawn length 50 mm) was laid, and between the piles, silica sand and tire crushed products totaled approximately 28 kg / Filled with m ² .
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

Example 1.4
After 300 g / m ^{2 of} binder (coating agent) was applied to the fourth section of the crushed stone layer (length 50 m × width 10 m), a drainage filter having a width of 100 mm and a length of 50 m was separated by 100 mm and a single gradient was formed. Arranged from the upstream side to the downstream side, the crushed stone layer and the non-woven fabric of the drainage filter are partially adhered, and on top of this, as in Example 1.1, long pile artificial turf (trade name Hybrid Turf, manufactured by Sumitomo Rubber Co., Ltd.) XP-50: lawn height 50 mm) was laid, and between the piles, silica sand and tire pulverized products were filled in a total of about 28 kg / m ^{2 as} fillers.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

[Comparative Example 1.1]
Only a non-woven fabric is arranged on the entire surface of the fifth section (length 50 m × width 10 m) of the crushed stone layer, and a long pile artificial turf (trade name Hybrid Turf XP, manufactured by Sumitomo Rubber Co., Ltd.) is formed thereon as in Example 1.1. −50: lawn height 50 mm) was laid, and between the piles, silica sand and tire pulverized products were filled in a total of about 28 kg / m ^{2 as} fillers.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rainfall: Slightly dry (△)
-Presence or absence of surface water pool: Partially present (△)
・ Existence of surface bulge: Partially occurred (△)

[Comparative Example 1.2]
Without placing a drainage filter in the sixth section of the crushed stone layer (length 50 m x width 10 m), the long pile artificial turf of Example 1.1 (manufactured by Sumitomo Rubber Co., Ltd., trade name Hybrid Turf XP-50: Turf height 50 mm) was laid, and between the piles, silica sand and tire pulverized products were filled in a total of about 28 kg / m ^{2 as} fillers.
[Evaluation of drainage]
・ Existence of surface unevenness: Yes (×)
・ Surface condition of filler after 2 hours of rain: wet condition (△)
-Presence or absence of surface water pool: Partially present (△)
・ Existence of surface bulge: Partially occurred (△)

[Comparative Example 1.3]
In the seventh section of the crushed stone layer (length 50 m x width 10 m), a drainage filter having a width of 100 mm is arranged from the upstream side to the downstream side of the single gradient with an interval of 1000 mm, and on top of that, Example 1.1 and Similarly, long pile artificial turf (manufactured by Sumitomo Rubber Co., Ltd., trade name Hybrid Turf XP-50: lawn height 50 mm) was laid, and between the piles, silica sand and tire pulverized products were filled in a total of about 28 kg / m ² . .
[Evaluation of drainage]
・ Existence of surface unevenness: Partial occurrence (△)
・ Surface condition of filler after 2 hours of rain: wet condition (△)
-Presence or absence of surface water pool: Partially generated (△)
・ Existence of surface swelling: None (○)

The construction specifications of Examples 1.1 to 1.4 and Comparative Examples 1.1 to 1.3 and the evaluation results of drainage are summarized in Table 1 below.

(Second Embodiment)
Next, with reference to FIG. 4, FIG. 5, the artificial turf structure 1B which concerns on 2nd Embodiment of this application is demonstrated.

  In the artificial turf structure 1B according to the second embodiment, a surface artificial turf (filled artificial turf) 50 is laid on the base 10 via the drainage filter 40 shown in FIG. 6 as in the first embodiment. In this second embodiment, the base 10 is an existing artificial grass 120 that has been used up.

  The existing artificial turf 120 is filled with a granular material 124 such as silica sand or rubber chips between piles (turf leaves) 122 which are planted on a base fabric 121 and are prevented from being detached by a backing material 123. Artificial grass with lumber, which is laid on a water-permeable foundation ground E made of asphalt concrete, for example. If the foundation ground E is clogged over time and the water permeability is reduced, or filling The granular material 124 as a material may be compressed (compacted) by a stepping pressure of a player or the like, and the drainage performance may be deteriorated.

  In addition, in the case of long pile artificial turf, the filler contains elastic granular materials such as rubber chips, and the protruding length of the pile protruding from the filler layer is as long as about 10 to 30 mm. It is difficult to ensure flatness suitable as a base for the artificial turf 50 laid on the ground.

  Therefore, in the second embodiment, when laying the surface artificial turf 50 on the existing artificial turf 120, it is preferable that the granular material 124 in the existing artificial turf 120 is preferably evened and then newly added. Crushed sand is added and crushed by a rolling roller or a rammer to form a smooth crushed sand layer 125 having a predetermined drainage gradient.

  Then, the binder 30 is applied onto the crushed sand layer 125 to form a base material layer 130 which is a solid and flat base made of the existing granular material 124, the crushed sand layer 125 and the binder 30. By laying the surface artificial turf 50 through the drainage filter 40, the artificial turf structure 1B having good drainage and no unevenness is constructed.

  Crushed sand is sand obtained by artificially crushing natural rock with a crusher or crusher, etc., and generally it passes through a 2.0-2.5 mm sieve and the particle size remains at 75 μm. Point to.

  Further, the thickness of the crushed sand layer 125 also has the meaning of adjusting the hardness as a base, and varies depending on the construction area, drainage gradient, the necessity of a function of suppressing frost heave, etc., but 2 to 50 mm, preferably 5 to 5 mm. It is preferable to cast with a thickness of 30 mm and uniformly roll.

  The binder 30 may be applied to the entire surface of the crushed sand layer 125, or may be partially applied in the form of streaks or dots (islands). In any case, it is preferable that the drainage filter 40 is integrally adhered to the base material layer 130 by the binder 30 in order to improve the drainage performance of the newly laid artificial turf 50.

  The type of the binder 30 is not particularly limited as long as it suppresses unnecessary movement of the crushed sand layer 125 and the hardness of the uniform base material layer 130 can be obtained. A coating agent (for example, a one-part moisture-curing urethane resin) applied to the surface layer of the filler for the purpose of preventing the movement of a certain granular material is preferably employed.

Moreover, although the coating amount of the binder 30 depends on its components, materials, and the like, it can be set to 0.3 to 20 kg / m ² as a guide. As the coating method, either rake coating or spraying may be used. The base material layer 130 constructed by application of the binder 30 is hardly water permeable or water impermeable.

  As another aspect, the drainage filter 40 may be bonded to the back side (backing material 53) side of the artificial turf 50 newly laid through the binder 30. In other words, the drainage filter 40 only needs to be bonded to one or both of the crushed stone layer 20 and / or the artificial turf 50.

  Referring to FIG. 6, as described in the first embodiment, the drainage filter 40 is formed on a non-woven sheet having a width of 100 mm and a length of 50 m in a fiber sheet base 41 and an outer diameter of φ7 mm (inner diameter). A drainage filter in which five drainage tubes each having a mesh tube of (φmm) mm × 50 m were embedded at intervals of 30 mm was used.

  Although the woven fabric may be sufficient as the sheet | seat base material 41, it is preferable that it is a nonwoven fabric from a water collecting viewpoint. Also in this 2nd Embodiment, the sheet | seat base material 41 consists of a nonwoven fabric, and is a strip | belt body of width 100mm and length 50m.

Also in the second embodiment, the nonwoven fabric constituting the sheet base material 41 may be formed from synthetic resin fibers such as polyethylene, polyethylene terephthalate, polypropylene, nylon, etc., but the friction resistance against the artificial grass 50 to be laid and the nonwoven fabric itself. The weight per unit area is preferably 50 to 150 g / m ² in consideration of the strength, workability, price, and the like.

In other words, if the basis weight is less than 50 g / m ² , it may be deformed or torn due to a load generated between the artificial turf 50 being worked or laid. On the contrary, if the basis weight exceeds 150 g / m ² , the thickness of the sheet base material 41 itself becomes too large, and the stability during the work of laying the artificial turf 50 is impaired. Since it becomes difficult to uniformly fill the granular material and unevenness tends to occur in the finish of the filler, it is not preferable.

  The drainage filter 40 may be laid on the entire surface of the foundation material layer 130, but if it has sufficient drainage capacity for the normally expected rainfall that falls on the artificial turf 50, it is installed at intervals. May be.

  For example, as described above, if the width is 100 mm and five drainage tubes 42 are inserted in the width, even if the drainage filter 40 is installed every 500 mm, extremes such as concentrated heavy rain caused by a typhoon Sufficient drainage performance can be secured except in case of heavy rainfall.

  Also in this second embodiment, in FIG. 4 and FIG. 5, the base material layer 130 is provided with a drainage gradient consisting of about 2% of a single slope that falls to the right, but around the artificial grass laying surface. Of these, it is preferable that the drainage side groove 60 is formed by excavation on the lower end side (the right end side in FIGS. 4 and 5) of the drainage gradient, and the drainage filter 40 is pulled out from the artificial turf laying surface and placed in the drainage side groove 60. Only the drainage tube 42 may be pulled out from the artificial turf laying surface and placed in the drainage side groove 60.

  According to this, in a state where water is saturated such as when it rains, the water contained in the drainage filter 40 can always flow down toward the drainage side groove 60 through the drainage tube 42. Further, the steam generated when the moisture contained in the base material layer 130 evaporates is released outside through the drainage tube 42, so that the air pillow is placed between the surface artificial grass 50 and the base material layer 130. Is prevented from occurring. As a result, it is possible to suppress these strength reductions, uneven settlement due to the occurrence of water supply, occurrence of unevenness, and the like.

  A surface artificial grass 50 is laid on the drainage filter 40. The artificial turf 50 has a synthetic resin pile 52 planted on a base fabric 51 at a predetermined interval, and a backing material 53 that prevents the planted pile 52 from falling off on the back surface of the base fabric 51. In order to prevent rainwater from staying in the artificial turf 50, the artificial turf 50 may be a synthetic turf filled with a granular material 54 having a predetermined thickness between the piles 52 after laying. After applying the backing material 53 on the back surface, it is preferable to form water-permeable holes in the base fabric 51 at predetermined intervals.

  According to the second embodiment, on the existing artificial turf 120 with a filler, crushed sand is thrown and crushed by rolling to form a flat crushed sand layer 125, and the binder 30 is applied onto the crushed sand layer 125. Then, a base material layer 130 which is a solid and flat base made of the existing granular material 124, the crushed sand layer 125 and the binder 30 is formed, and the drainage filter 40 is placed thereon, and the artificial turf is placed on the drainage filter 40. The rainwater that permeates the lower layer through the surface artificial grass 50 can be drained along a predetermined drainage gradient through the drainage filter 40 by a simple construction method of laying 50.

  Moreover, even if rainwater that has flowed and accumulated in the base material layer 130 evaporates as the temperature rises, the water vapor is discharged out of the artificial turf laying surface through the drainage filter 40. An air pocket (air pillow) cannot be formed, and the artificial turf 50 laid does not cause unevenness due to swelling or the like.

  The surface artificial grass 50 used in each of the first and second embodiments will be further described. For the base fabric 51, for example, a woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyethylene terephthalate, or the like. A non-woven fabric is used, but low density polyethylene with good meltability is preferable in consideration of recyclability.

  The pile (turf leaf) 52 is preferably a so-called long pile whose pile length (the length from the surface of the base fabric 51 to the tip) is as long as about 30 to 80 mm. The pile 52 is also preferably made of a thermoplastic resin fiber such as polypropylene, polyethylene, nylon, etc., but in consideration of recyclability, low density polyethylene with good meltability is preferable.

The pile 52 may be a bundle of a plurality of monotape yarns or monofilament yarns, or a strip-like split yarn. The pile 52 in this embodiment has a thickness of 5000 to 25000 dtex and is planted on the base fabric 51 at a planting amount of 1000 to 2500 g / m ² .

  For the backing material (backing material) 53, for example, a thermosetting resin such as SBR latex or urethane, or a thermoplastic resin such as polyethylene or polypropylene is used. If necessary, an extender such as calcium carbonate is added. It's okay.

  In addition to hard granular materials such as silica sand, the granular material 54 as a filler is, for example, elastic particles such as rubber chips obtained by pulverizing tires or industrial rubber products, or colored color chips produced exclusively, thermoplastic resin chips, etc. Things may be included. The filler layer may be a single layer structure of elastic granular material.

  The thickness of the filler layer made of the granular material 54 is arbitrarily selected depending on the elasticity required for the artificial turf structure, but in order to prevent the granular material 54 from flowing out and scattered, the protruding height of the pile 52 ( The length from the surface of the filler layer to the pile tip is preferably 10 to 30 mm or more.

  The artificial turf 50 to be newly laid is usually carried into the construction site in a roll form with a width of about 2 to 5 m. For example, depending on the width required for a tennis court or the like, a plurality of the artificial turf 50 is joined via a joint tape. Although the joint tape is laid as a single piece by sticking with a special adhesive, the drain tube 42 of the drainage filter 40 is disposed on the part removed from the joint tape because the joint tape is water-impermeable. It is preferable to dispose only the nonwoven fabric 41.

(Example of the second embodiment)
Next, Examples 2.1 to 2.4 according to the second embodiment and Comparative Examples 2.1 to 2.3 will be described.

About [Basic material layer]
First, as a common item for the examples and comparative examples, for the existing long pile artificial turf with filler, the filling thickness unevenness due to the unevenness of the granular material caused by many years of use is averaged by a dedicated leveling machine. After that, crushed sand is sprayed uniformly at a standard of 5 kg / m ² , and the pressure is reduced so that the gradient of drainage is 2% as a single gradient, and the one-part moisture type urethane resin (trade name, manufactured by Sumitomo Rubber Co., Ltd.) “Grip Coat C926”, NCO = approx. 10%) and ethyl acetate are mixed in equal amounts and applied uniformly to a coating amount of 1.5 kg / m ² with a joro. Layered.

  The area of the base material layer was about 50 m long × about 70 m wide, and the drainage gradient was a 2% single gradient along the length direction, similar to the pavement substrate. In addition, a U-shaped drainage side groove having a depth of 30 cm and a width of 25 cm was formed along three sides excluding the upstream side edge of the foundation material layer, and drained by a pipe from a water collecting tank. This base material layer is divided into 7 sections in total of 50 m in length and 10 m in width, and each artificial turf structure of Examples 2.1 to 2.4 and Comparative Examples 2.1 to 2.3 is divided into each section. Was provided.

About [drainage filter]
In Examples 2.1 to 2.4 and Comparative Example 2.3, a drainage filter comprising a nonwoven fabric sheet having a width of 100 mm × a length of 50 m and a mesh tube having an outer diameter of φ7 mm (inner diameter φmm) mm × 50 m as a drainage filter. A drainage filter in which five tubes were embedded at intervals of 30 mm was adopted. In addition, in the example which connects a waste_water | drain filter in parallel, the edge parts of the nonwoven fabric were welded with the simple gas burner.

About [Evaluation of drainage]
As with the examples in the first embodiment, the examples and the comparative examples in the second embodiment are also left for two months as an exposure test after construction, and after the rain has occurred, the occurrence of surface unevenness occurs. The following four items were evaluated: presence or absence, surface condition of the filler after 2 hours of rainfall, presence or absence of surface water accumulation, and presence or absence of surface swelling.

Example 2.1
On the entire surface of the first section (length 50m x width 10m) on the base material layer, a drainage filter is arranged from the upstream side to the downstream side of the single gradient, and on that, as a new artificial grass, made by Sumitomo Rubber Co., Ltd. Long pile artificial turf (trade name “Hybrid Turf XP-50”: turf length 50 mm) was laid, and between the piles, silica sand and pulverized tire were filled in a total of about 28 kg / m ² .
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

Example 2.2
In the second section of the base material layer (length 50 m × width 10 m), a drainage filter with a width of 100 mm and a nonwoven fabric with a width of 100 mm are alternately arranged from the upstream side to the downstream side of the single gradient, respectively, As in Example 2.1, long pile artificial turf (trade name Hybrid Turf XP-50: lawn length 50 mm, manufactured by Sumitomo Rubber Co., Ltd.) was laid, and silica sand and tire pulverized product as a filler were combined between the piles. 28 kg / m ^{2 was} charged.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

[Example 2.3]
In the third section (length 50 m × width 10 m) of the base material layer, a drainage filter having a width of 100 mm is arranged from the upstream side to the downstream side of the single gradient with an interval of 100 mm, on top of which, Example 2.1 In the same way as above, long pile artificial turf (Sumitomo Rubber Co., Ltd., trade name Hybrid Turf XP-50: lawn length 50 mm) is laid and filled with silica sand and tire crushed material as a filler between the piles of about 28 kg / m ² did.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

[Example 2.4]
300 kg / m ^{2 of} coating agent is applied to the fourth section (length 50 m × width 10 m) of the base material layer, and a drainage filter having a width of 100 mm is provided on the fourth section with an interval of 100 mm on the downstream side from the upstream side of the single gradient. After placing the drainage filter and partially adhering to the base material layer, long pile artificial turf (trade name Hybrid Turf XP-50: lawn length 50 mm, manufactured by Sumitomo Rubber Co., Ltd.) was laid as in Example 2.1. Then, a total of about 28 kg / m ² of silica sand and tire pulverized products were filled between the piles.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rain: Dry (○)
-Presence or absence of surface water accumulation: None (○)
・ Existence of surface swelling: None (○)

[Comparative Example 2.1]
A non-woven fabric is installed on the entire surface of the fifth section (length 50 m × width 10 m) of the base material layer, and on top of this, a long pile artificial turf (trade name Hybrid Turf XP, manufactured by Sumitomo Rubber Co., Ltd.) is used as in Example 2.1. −50: lawn height 50 mm) was laid, and between the piles, silica sand and tire pulverized products were filled in a total of about 28 kg / m ^{2 as} fillers.
[Evaluation of drainage]
・ Existence of surface unevenness: None (○)
・ Surface condition of filler after 2 hours of rainfall: Slightly dry (△)
-Presence or absence of surface water pool: Partially generated (△)
・ Existence of surface bulge: Partially occurred (△)

[Comparative Example 2.2]
Long pile artificial turf (trade name Hybrid Turf XP, manufactured by Sumitomo Rubber Co., Ltd.), as in Example 2.1, without placing a drainage filter in the sixth section (length 50m x width 10m) of the base material layer −50: lawn height 50 mm) was laid, and between the piles, silica sand and tire pulverized products were filled in a total of about 28 kg / m ^{2 as} fillers.
[Evaluation of drainage]
・ Existence of surface unevenness: Yes (×)
・ Surface condition of filler after 2 hours of rain: wet condition (△)
-Presence or absence of surface water pool: Partially generated (△)
・ Existence of surface bulge: Partially occurred (△)

[Comparative Example 2.3]
In the process of constructing the seventh section (length 50m x width 10m) of the base material layer, a drainage filter with a width of 100mm is opened on the crushed sand layer before application of the coating agent, with an interval of 100mm upstream After being placed from the downstream side to the downstream side, a long pile artificial turf (trade name Hybrid Turf XP-50: lawn length 50 mm, manufactured by Sumitomo Rubber Co., Ltd.) is laid and silica sand is used as a filler between the piles. A total of about 28 kg / m ² of tire pulverized products were filled.
[Evaluation of drainage]
・ Existence of surface unevenness: Partial occurrence (△)
・ Surface condition of filler after 2 hours of rain: wet condition (△)
-Presence or absence of surface water pool: Partially generated (△)
・ Existence of surface swelling: None (○)

The construction specifications of Examples 2.1 to 2.4 and Comparative Examples 2.1 to 2.3 and the evaluation results of drainage are summarized in Table 2 below.

  As a comprehensive evaluation, both the working examples (1.1 to 1.4) in the first embodiment and the working examples (2.1 to 2.4) in the second embodiment are both underlayers (110, 120). And a simple construction method of disposing a drainage filter 40 including a drainage tube 42 on a fiber sheet substrate 41 as a drainage layer between the artificial turf (surface artificial turf) 50 newly laid on the surface, It is possible to obtain an artificial turf structure that has good drainage and hardly generates water pool or unevenness due to rainfall.

1A, 1B Artificial turf structure 10 Ground 110 Non-permeable soil-based pavement ground 120 Existing artificial turf 125 Crushed sand layer 130 Base material layer 20 Crushed stone layer 30 Binder (Coating agent)
40 Drain filter 41 Sheet base material 42 Drain tube (drain pipe)
50 Artificial grass to be newly laid (surface artificial grass)
60 Drainage gutter

Claims (2)

In an artificial turf structure in which an artificial turf with a filling material formed by filling granular materials between piles is laid on an underwater-permeable or non-permeable permeable ground made of a soil system,
A crushed stone layer provided on the base, and a drainage filter including a drainage tube in a fiber sheet base material as a drainage layer disposed on the crushed stone layer, and the artificial material containing the filler on the drainage filter Turf is laid, and the crushed stone layer has a drainage gradient on the surface layer, and a drainage side groove is provided on the lower side of the drainage gradient on the side of the artificial turf laying surface. An artificial turf structure characterized in that the portion is drawn from the lower end side of the drainage gradient and enters the drainage side groove . In the artificial turf structure formed by laying a new artificial turf on the existing artificial turf with filler, leaving the existing artificial turf with filler filled between the piles as an underlayer as it is,
And the existing foundation material layer provided on the filled artificial turf on, and a waste water filters containing drain tube to the fiber-made sheet within the substrate as a drainage layer disposed on the underlying material layer, the waste water The new artificial grass is laid on the filter,
The foundation material layer is formed by a crushed sand layer that has been tamped smoothly by rolling pressure and a binder applied on the crushed sand layer, and the foundation material layer has a drainage gradient, A drainage side groove is provided at the lower end side of the artificial turf laying surface, and an end of the drainage filter is drawn from the lower end side of the drainage gradient and enters the drainage side groove. Turf structure.

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