JP6429074B2 - Competition ground cooling system - Google Patents

Description

  The present invention relates to an athletic ground cooling system that suppresses the temperature rise of the athletic ground surface on which artificial turf or the like is laid.

  In recent years, for example, the number of days of midsummer days and extremely hot days in Tokyo has increased, and it has become rare that the temperature of the surface of a competition ground such as a soccer ground, an athletic field, a tennis court, or a school grounds exceeds 60 ° C. Yes. When sports are performed in such a situation, there is a higher possibility of health hazards such as heat stroke to athletes, children, students, and the like.

  By the way, the Tokyo Olympics, which are decided to be held in 2020, are scheduled for various outdoor competitions at the time when intense heat is observed every year. If the surface of the competition ground becomes hot, it is expected that athletes will get tired earlier and cannot fully demonstrate their abilities. As a host country, it is required to provide an appropriate competition environment for players from all over the world.

  For the purpose of suppressing the surface temperature rise of the artificial turf, Patent Document 1 discloses a technique in which a water guide sheet is provided on the ground and the surface of the artificial turf pile is maintained in an appropriate wet state. However, in order to maintain the artificial turf pile surface in a moist state using capillary action, the particle size distribution of the particulate matter filled in the piled pile and the water passage hole, the diameter of the water passage hole, the opening ratio, etc. Various factors need to be adjusted fairly precisely, and construction and maintenance for obtaining a temperature suppression effect are not easy.

  Further, Patent Document 2 discloses that a water retaining chip is used as a filler between artificial turf piles for the purpose of suppressing an increase in surface temperature. This is to use a foaming member having a sponge structure for the chip to obtain a temperature suppressing effect, but it is necessary to sprinkle water to make the water retaining chip contain water and to exhibit a predetermined function. It is necessary to produce a water-retaining tip so as to meet the conditions, and its construction and maintenance are not easy.

  Furthermore, a drainage pipe is buried under the ground pavement of a ground laid with artificial grass or natural grass, a riser pipe is attached from the end of the drainage pipe, and a spray nozzle is fixed to the upper end of the riser pipe. Technology that detects the output of various sensors arranged for actually measuring dryness and humidity, etc., and supplies water to the water distribution pipe and discharges the spray onto the ground when it is inappropriate for the ground environment Is also disclosed in Patent Document 3. However, this technology sprays above the gland, and even if the temperature and humidity of the sprayed area can be controlled, the spray nozzle and thus the pump discharge force can be used to prepare the entire gland environment. Needs to be made very large or the number of nozzles needs to be very large, which is not always practical.

JP 2002-339312 A JP 2012-219580 A JP 2006-177130 A

  There is a need for an athletic ground cooling system that can be easily constructed and maintained, and that can provide a stable temperature rise suppressing effect on the athletic ground surface at low construction costs and low running costs.

The competition ground cooling system according to the present invention includes a cooling structure layer provided below a surface layer that is laid on the ground layer of the competition ground at a predetermined interval, and a direction provided in the cooling structure layer and parallel to the surface layer. It has the spray nozzle which spouts fog toward toward, and the water supply apparatus which supplies water to this spray nozzle.
By comprising in this way, a cooling structure layer is cooled from the inside with the fog ejected from the spray nozzle, and the temperature rise of the surface layer on it is suppressed. Thereby, the temperature rise suppression of a competition ground surface is aimed at and a player's burden can be reduced. In addition, since the cooling structure layer and the surface layer (for example, artificial turf layer) may be sequentially stacked on the flat base layer, the construction is easy. Further, when the artificial turf layer is damaged by use, only the normal artificial turf layer needs to be replaced, and maintenance is easy.

The cooling structure layer has a support member for maintaining a predetermined interval between the ground underlayer and the surface layer, and can be configured such that a fog passage from the spray nozzle is formed within the predetermined interval. Moreover, it can also be set as the structure which has an upper side (namely, the said lower layer) flat plate-like member and / or a lower side (namely, on the said base layer) flat-plate member spaced apart by the said support member.
In this way, the cooling structure layer can be a simple structure, and in particular, if the surface layer of the competition ground is used as the upper flat plate member or the ground layer of the ground is used as the lower flat plate member. Thus, a simpler structure can be obtained, and formation of a fog passage and strength design thereof are facilitated. The mist diffuses through the passage inside the cooling structure layer, which is effective for cooling the entire cooling structure layer. In addition, the cooling structure layer can be configured in a panel shape, and construction and maintenance are facilitated.

The water supply apparatus can also include a water conduit provided in the cooling structure layer for supplying water to the spray nozzle. By providing a water guide pipe in the cooling structure layer, the cooling structure layer configured in a panel shape is arranged side by side and connected to the base layer, thereby facilitating construction.
In addition, by forming the above water guide pipe as a part of the support member, not only can the design of the cooling structure layer be optimized, but depending on the material of the pipe, a cushioning effect is also exhibited, and the athlete Therefore, it is possible to easily obtain a cooling structure layer that can withstand an impact from the movements of

Furthermore, the spray state detection sensor which detects the spray state by a spray nozzle is provided, and the controller of a water supply apparatus can also control clogging elimination trial operation | movement based on the output of this spray state detection sensor. For example, it is possible to try to eliminate clogging by using a flow meter as the spray state detection sensor and increasing the pump output by detecting a decrease in the flow rate.
Further, by configuring the controller to determine the clogged location based on the output of the spray state detection sensor, replacement of the spray nozzle, replacement of the cooling block, and the like can be easily performed.

  According to the present invention, not only construction and maintenance can be easily performed, but also the temperature rise of the entire competition ground is controlled directly below it. In addition, it is possible to provide a cooling system for a competition ground that can be obtained at a low running cost.

It is a figure which shows the example of installation of the cooling structure layer to the artificial turf ground in the athletic ground cooling system by one Embodiment of this invention. It is a figure which shows the structural example of the cooling structure block used for the athletic ground cooling system by one Embodiment of this invention, (A) is a basic example, (B) is an application example, (C) is another application example. is there. It is a figure which shows the example of installation of the cooling structure layer to the artificial turf ground in the athletic ground cooling system by other embodiment of this invention. It is a schematic block diagram which shows the water supply system of the athletic ground cooling system by one Embodiment of this invention. It is a schematic block diagram which shows the water supply system of the athletic ground cooling system by other embodiment of this invention. It is a flowchart which shows an example of the process in the controller in the system of FIG. It is a flowchart which shows an example of the process in the controller in the system of FIG.

  Hereinafter, a configuration of a cooling system for a competition ground according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the athletic ground in which the cooling system according to this embodiment is installed includes an artificial turf layer 1, a cooling structure layer 2, and an underlayer 3 in that order. As the artificial turf layer 1, a normal long pile artificial turf, a short pile artificial turf, or the like can be used. In FIG. 1, details of the cooling structure layer 2 are omitted, and details thereof will be described later. The foundation layer 3 only needs to have a flat finished surface. For example, a crushed stone layer provided on a road floor and a permeable asphalt pavement provided thereon can be used.

  FIG. 2A shows a basic configuration example of the cooling structure block 20 which is one unit constituting the cooling structure layer 2. FIG. 2 (A) shows two cooling structure blocks 20a and 20b installed next to each other. The cooling structure block 20a mainly shows its internal structure, and the cooling structure block 20b has its The internal structure is omitted. The two cooling structure blocks 20a and 20b have the same configuration.

  2A, in the cooling structure block 20a, an upper flat plate member 21 and a lower flat plate member 22 are arranged in parallel at a predetermined interval, and these two flat plate members 21 and 22 are connected to a side member 23a, It is a structure having a thin box-shaped rectangular parallelepiped shape connected by 23b, 23c, and 23d. In order to show the inside of the cooling structure block 20a, the upper flat plate member 21 is omitted in the drawing, but in this example, actually, as shown in the cooling structure block 20b, the upper flat plate member 21 is shown. The upper surface is covered by and the inside is hidden. The upper flat plate member 21 and the lower flat plate member 22 are also connected by a partition member 24, and partitions 25a and 25b are formed by a substantially rectangular parallelepiped space. The side members 23a, 23b, 23c, 23d, and the partition member 24 function as support members for maintaining the internal space. In this example, one cooling structure block 20 is divided into two compartments, but it may be one compartment or three or more compartments.

  Further, the upper and lower flat plate members 21 and 22, the side members 23a, 23b, 23c and 23d, and the partition member 24 may be provided with holes so as not to have a great influence on the strength, or may be formed in a net shape. You can also. As a result, the internal space of the cooling structure block 20 communicates with the outside thereof, and mist (that is, cold heat) ejected into the cooling structure block 20 can be sent to the upper, lower, and sides of the block 20. .

These upper flat plate member 21, lower flat plate member 22, side members 23a, 23b, 23c, 23d and partition member 24 may be formed of, for example, an elastic synthetic resin having good thermal conductivity.
As the synthetic resin, those having excellent impact resistance and cushioning properties can be preferably used, and the cooling structure block 20 also serves as a cushioning material as a whole, reducing the burden on the athlete's knee. In general, the thermal conductivity of resin materials is 1 to 3 orders of magnitude lower than metals (0.1 to 0.3 W / m · K), but a synthetic resin with high thermal conductivity is obtained by mixing a thermally conductive filler. be able to. For example, various high thermal conductive synthetic resins having a thermal conductivity exceeding 20 W / m · K have been developed, and these can also be used.
When the installation interval of the side member and the partition member is large, the cushion function is increased, but the upper flat plate-shaped member 21 is largely recessed, which may cause the player to take his / her foot. Therefore, the side member and the partition member are configured to have appropriate shapes and intervals so that the upper flat plate member 21 is not excessively depressed downward due to an impact applied by the movement of the player.

  A water guide pipe 26 having a substantially circular cross-sectional shape is formed through the side members 23 a and 23 c and the partition member 24. The end face of the cooling structure block 20 is opened for passage of the water conduit 26. The water guide pipe 26 is connected to a water storage tank, a water supply facility, and the like through a pump (not shown).

As shown in FIG. 2B, the outer diameter of the water guide pipe 261 may be set to be substantially the same as the vertical interval between the upper flat plate member 21 and the lower flat plate member 22. Thereby, the water guide pipe 261 also functions as a support member and can better withstand the load from above. Some of the side members 23a, 23b, 23c, 23d and the partition member 24 as support members may be omitted as appropriate, or may be members having low strength.
Further, as shown in FIG. 2 (C), the water guide pipe 262 may be a cylinder having a square or rectangular cross section having the same vertical size as the interval between the two flat members 21 and 22. The function as a support member can be increased. The water guide pipe 262 also functions as a support member and can better withstand the load from above. Some of the side members 23a, 23b, 23c, 23d and the partition member 24 as support members may be omitted as appropriate, or may be members having low strength.

  The water guide pipe 26 (hereinafter also including 261 and 262) includes each member of the cooling structure block 20, that is, the upper flat plate member 21, the lower flat plate member 22, the side members 23a, 23b, 23c and 23d, and the partition member 24. These members can be formed of the same synthetic resin, and these members can be integrally formed.

  A spray nozzle 27 is provided in the water guide pipe 26 so as to eject mist (mist) in a horizontal direction, that is, in a direction parallel to the upper and lower flat plate members 21 and 22. Further, the water guide pipe 26 can be a metal pipe such as stainless steel. In this case, through holes are provided in the side members 23a and 23c and the partition member 24, or these members are formed into a net-like body. It is possible to pass through a water conduit 26 made of metal such as stainless steel.

The upper and lower flat plate members, side members, and partition members can also be made of metal such as stainless steel.
Moreover, a support member can also be provided to such an extent that the diffusion of the ejected mist is not hindered. If many support members are provided, it can further withstand the impact from above by the competitor, but it will also prevent the mist from spreading, so the number, shape, size, material, etc. of the support members should be appropriately Composed.

In the present invention, as shown in FIG. 3A, the cooling structure block 20 includes only the lower flat plate member 22, omitting the upper flat plate member 21, and the surface layer of the competition ground, the embodiment of FIG. Then, the base member of the artificial turf layer 1 can also serve as the upper flat plate member.
Conversely, as shown in FIG. 3B, only the upper flat plate member 21 may be used, and the lower flat plate member 22 may be omitted. In this case, the base layer 3 also serves as the lower flat plate member.
Of course, as shown in FIG. 3C, the upper and lower flat plate members 21 and 22 may be omitted, and only the side members 23a,... In any of these examples, each member can be provided with a through hole, or each member can be formed of a net-like body, whereby the mist can be diffused in the upper, lower, and side directions.
Further, the support member is not limited to the plate-shaped body as described above, and for example, a large number of ring-shaped bodies having random shapes and sizes are continuous, and each of the support members illustrated in FIGS. 2 and 3A to 3C. Packed in a space surrounded by members (see FIG. 3 (D)) or a net-like body in which the size of the eyes and the thickness of the thread may be uniform or non-uniform It is good also as a state (refer FIG.3 (E)) in which stuffed. Of course, when such a ring-shaped body or net-shaped body is used as a support member, as shown in FIGS. 3 (D) and 3 (E), the above-described upper and lower flat plate members 21, 22 and side members are used. 23a,... And the partition member 24 can be omitted (it goes without saying that all members or any one member may be used). In FIG. 3D, reference numeral 32 denotes a support member (for example, “hettimalon” -like configuration) in which a large number of ring-shaped bodies having the above-mentioned random shape and size are continuously formed. ), 33 is a support member composed of a net-like body having a uniform or non-uniform mesh size and thread thickness.

  According to the above embodiment, the competition ground is constructed as follows. A large number of cooling structure blocks 20 are arranged horizontally on the underlayer 3 to form the cooling structure layer 2. A sheet-like artificial turf is layered on top of it, and the joints are processed. By matching the openings of the water conveyance pipes 26 at the ends of the cooling structure block 20, the water conveyance pipes 26 communicate with each other over the plurality of cooling structure blocks 20, thereby forming a water supply path. In addition, by connecting the plurality of cooling structure blocks 20 in advance, installation on the site is facilitated.

  As shown in FIG. 4, the water conduit 26 to which the spray nozzle 27 is attached is connected to a water supply facility via a pump 60, a water storage tank 61, and a water pipe 62. The pump 60 is controlled by a controller 64 in response to a signal from a sensor 63 composed of a temperature sensor, a humidity sensor, and the like. This cooling system is configured by closing a power switch 65. The operation is started.

  Next, the operation of the cooling system configured as described above will be described. Prior to the start of the competition, the power switch 65 is closed and the system is started. The controller 64 outputs a start command to the pump 60 based on measured values such as temperature and humidity by the sensor 63. When the pump 60 is activated, water is supplied from the water supply facility to the water guide pipe 26 via the water supply pipe 62 and the water storage tank 61, and mist is ejected from the spray nozzle 27. Mist from the spray nozzle 27 diffuses the space in the cooling structure block 20 in the horizontal direction. That is, it diffuses in a direction parallel to the artificial turf layer 1 that is the surface layer.

  Thereby, the whole space in the cooling structure block 20 is cooled, and when the upper flat plate member 21 and the member are omitted, the ground surface layer or the artificial grass layer 1 base member is cooled. The artificial turf layer 1 is on the upper flat plate member 21 to be cooled, the base member of the artificial turf layer 1, or the surface layer of the ground, and the temperature of the space on the artificial turf layer 1 can be reduced. As a result, the temperature at the foot is lowered and the radiant heat from the ground surface is reduced, which greatly reduces the burden on the athlete.

The lower hole 31 provided in the lower flat plate member 22 also functions as a drain of mist diffused in the cooling structure block 20. During the rain, rainwater that has passed through the artificial turf layer 1 passes through the upper hole 30, the space in the cooling structure block 20, and the lower hole 31, and penetrates into the underlying layer 3.
As the flat members 21 and 22, a net-like member can be used instead of the plate member provided with the holes 30 and 31 as described above, and either the upper or lower flat member 21 or 22 is used. One or both may be omitted. When using a net-like body, the mesh of the net shows the same action as that of the hole 31, and when these members are omitted, the base member of the artificial turf layer 1 or the base layer 3 is directly as described above. Needless to say, it exhibits a positive effect. Of course, it is needless to say that an excellent drain function is exhibited even when the support members 32 and 33 are configured as shown in FIGS. 3D and 3E.

  In the above-described embodiment, the artificial turf layer is described as the surface layer. However, the present invention can be similarly applied to a surface layer of polyurethane or synthetic rubber such as a track portion of an athletic field. The present invention can also be applied to a mixed turf competition ground whose surface layer is composed of artificial turf and natural turf. In the case of this mixed turf, the mist also has a function of supplying water to the natural turf, and it is not necessary to supply water separately for growing the natural turf.

  By the way, in a cooling system that uses water, the calcium component contained in tap water or the like accumulates inside the water guide pipe 26 or the spray nozzle 27 due to long-term use, causing clogging and making it impossible to perform desired spraying. There is sex. As a countermeasure, an embodiment of a cooling system having a function of detecting clogging will be described with reference to FIGS.

  In FIG. 5, a plurality of spray nozzles 27-1, 27-2 and 27-3 are provided on the water guide pipe 26, and flow meters 28-1, 28-2 and 28-3 are respectively attached to the water guide pipes 26. Yes. The flow meters 28-1, 28-2, 28-3 measure the flow rates of water sent to the spray nozzles 27-1, 27-2, 27-3, respectively. Here, the flow meters 28-1, 28-2, 28-3 function as spray state detection sensors. Other sensors such as a pressure gauge may be used as long as the spray state can be detected. The flow rate measurement values from the flow meters 28-1, 28-2, 28-3 are given to the controller 64 so that predetermined processing is performed and the processing results are provided to the pump 60 and the display device 66. It has become. Other configurations are the same as those in FIG. Although three spray nozzles and three flow meters are illustrated in FIG. 5, the present invention is not limited to this, and it goes without saying that a larger number of spray nozzles and flow meters are provided in an actual system.

  Processing in the controller 64 will be described with reference to FIGS. In Step 701 in FIG. 6, the controller 64 inputs the flow rate measurement values F1, F2, and F3 from the flow meters 28-1, 28-2, and 28-3. In step 702, each of the flow rate measurement values F1, F2, and F3 is compared with the reference value Fr. The reference value Fr corresponds to a lower limit flow rate value when spraying is appropriately performed. If any one of the flow rate measurement values F1, F2, and F3 is equal to or less than the reference value Fr, it is assumed that clogging has occurred in any part of the system, and in step 703, a command to increase the output is given to the pump 60. . The discharge amount of the pump 60 is increased, and high water pressure is applied to the water guide pipe 26 and each spray nozzle 27, so that it can be expected to eliminate clogging. In step 704, the output of the pump 60 is returned to a normal predetermined value. In step 705, 1 is added to the count value N of the repetition count of the output increase operation of the pump 60. The initial value of the repeat count value N is 1. In step 706, it is determined whether or not the repeat count value N has reached a predetermined value Ne. If the repeat count value N has not reached the predetermined value Ne, the process returns to step 701.

  If any of the flow rate measurement values F1, F2, and F3 is still below the reference value Fr in step 702, a command to increase the output is given to the pump 60 in step 703. Proceeding to Steps 704 and 705, if it is determined in Step 706 that the repetition count value N has reached the predetermined value Ne, it is assumed that the clogging cannot be eliminated by increasing the output of the pump 60. Decide to proceed to location determination.

  On the other hand, if it is determined in step 702 that all of the flow rate measurement values F1, F2, and F3 exceed the reference value Fr, it is assumed that there is no clogging or clogging is eliminated, and in step 710, the repeat count value N Is reset to 1, and the process returns to step 701. The output increase operation of the pump 60 is an example of a clogging elimination trial operation in the system.

  If the clogging cannot be eliminated by the increase in the output of the pump 60, a clogging location determination routine is started in step 801 in FIG. In step 802, the flow rate measurement value Fi is compared with the reference value Fr to determine whether the flow rate measurement value Fi is equal to or less than the reference value Fr. Here, the flow rate measurement value Fi is a flow rate measurement value for the i-th spray nozzle 27 i from the upstream side among the plurality of spray nozzles 27 provided in the water conduit 26. The initial value of i is 1. If the flow rate measurement value Fi is equal to or less than the reference value Fr, it is determined in step 803 that the spray nozzle 27i may be clogged. If it is determined from the comparison result in step 802 that the flow rate measurement value Fi is larger than the reference value Fr, it is assumed that clogging has not occurred, i is incremented in step 810, and the process returns to step 802. In step 804, it is determined whether i has reached the total number of spray nozzles. If i has not reached the total number of spray nozzles, i is incremented in step 811 and the process returns to step 802.

As described above, the comparison in Step 802 is performed for all the spray nozzles provided in the water conduit 26, and the spray nozzle 27i that may be clogged is specified. In Step 804, the clogging determination is performed. finish. The clogging determination result is displayed on the display device 66. As the display device 66, for example, a liquid crystal display device is used, and the arrangement of the water guide pipe 26 and the spray nozzle 27i (27-1, 27-2, 27-3, ...) is schematically displayed on the screen. Then, the spray nozzles that are determined to be clogged are displayed, for example, to change their colors. By displaying in this way, it is possible to grasp all the spray nozzles that are clogged.
On the other hand, for example, it is displayed that all the spray nozzles (27-2, 27-3, 27-4, ...) downstream of the spray nozzle 27-2 may be clogged. In actuality, there is a possibility that clogging is actually occurring upstream of the spray nozzle 27-2 of the water guide pipe 26 rather than clogging of the spray nozzle.
Thus, the maintenance worker can estimate the clogged portion in the water guide pipe 26 by looking at the display on the display device 66. The display device 66 includes a device capable of auditory display such as a buzzer sound and sound in addition to visual display.

  The maintenance worker can peel off the artificial turf layer 1 on the identified spray nozzle clogged portion and replace only the corresponding spray nozzle. In addition, the cooling structure block 20 including the corresponding spray nozzle can be replaced. In particular, when clogging in the water guide pipe 26 is estimated, it is preferable to replace the corresponding cooling structure block 20. As described above, according to the present embodiment, when clogging occurs, the location can be quickly identified or estimated, and can be replaced in units of troubled cooling blocks, facilitating maintenance.

DESCRIPTION OF SYMBOLS 1 Artificial grass layer 2 Cooling structure layer 3 Base layer 20, 20a, 20b Cooling structure block 21 Upper flat member 22 Lower flat member 23a, 23b, 23c, 23d Side member 24 Partition member 25a, 25b Section 26, 261 262 Water guide pipe 27 Spray nozzle 28 Flow meter 30, 31 Hole 32 Ring-shaped body 33 Net-shaped body 60 Pump 61 Water tank 62 Water supply pipe 63 Sensor 64 Controller 65 Power switch 66 Display device

Claims (7)

A cooling structure layer provided below the surface layer laid at a predetermined interval on the ground layer of the competition ground;
A spray nozzle provided in the cooling structure layer, for spraying mist in a direction parallel to the surface layer;
A competition ground cooling system having a water supply device for supplying water to the spray nozzle.   The cooling structure layer includes a support member for maintaining the gap between the base layer and the surface layer, and a mist passage from the spray nozzle is formed in the predetermined gap. The competition ground cooling system according to claim 1.   The athletic ground cooling system according to claim 2, wherein the cooling structure layer has an upper flat plate member and / or a lower flat plate member at the predetermined interval.   The competition water cooling system according to any one of claims 1 to 3, wherein the water supply device includes a water guide pipe provided in the cooling structure layer for supplying water to the spray nozzle.   The competition ground cooling system according to claim 4, wherein the water guide pipe is formed as a part of the support member.   Further, the water supply device includes a controller for controlling water supply, and the controller controls a clogging elimination trial operation based on an output of the spray state detection sensor. The athletic ground cooling system described in Crab.   The competition ground cooling system according to claim 6, wherein the controller determines a clogged portion based on an output of the spray state detection sensor.