JPH07166509A - Sports turf - Google Patents

Abstract

PURPOSE:To favorably and arbitrarily carry out growing management of sports turf in inexpensive facilities, by providing a water-shielding layer under a field ground and controlling the water level, etc., of the field ground by feeding water from a water reservoir or draining water. CONSTITUTION:The upper water level in a turf 8 ground is measured by water level sensors 31, 32, the lower water level is measured by a water level sensor 33 and the nutriment-ions in the water of the reservoir tank 11 are measured by ion meters 3, 4 and a pH meter 35. And these detection signals are input in a controlling computer 30. When the detected figures of the water level sensors 31, 32 are lower than respective preset values for instance, at first, a feed water pump 20 is operated to supply the water in reservoir tank 11 up to the level between water level sensors 31, 32 and halted at that level. In this way, the turf ground can be kept in an appropriately wet condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a sports ground for sports on grass.

[0002]

2. Description of the Related Art In sports such as soccer and tennis that compete on a turf ground (turf), it is disliked that a puddle is generated due to rainfall or the turf is peeled off. For this reason, it is necessary to create a soil surface that is well-swept and to properly manage the growth of turf.

For this reason, a construction method in which a drainage facilitating underdrain is provided in the soil has been adopted, and fertilization for turf growth and water supply have been most commonly performed from above. However, because the growth control of turf is difficult, drainage performance during rain is not always good.

Recently, as a sports turf capable of automatic moisture management, a cell system developed by the cell system company in the United States has appeared, and soccer games and the like can be played on a clean turf on a field employing this. .

In this cell system, a wide area ground is divided into a large number of cells. In each cell, soil is placed in a small tank made of water-resistant sheet to cultivate turf, and a double pipe structure is laid in the soil and an air supply pipe is also installed. The double-pipe structure has a water supply hole and a water discharge hole through which water can be supplied and drained into the soil of each cell. In addition, air can be sent into the soil through the air pipe.

Further, sensors are embedded in each cell, and a system for controlling water supply / drainage and air supply while monitoring the water condition of each cell by a central computer based on the detection information is built up. The moisture environment of the soil and the conditions for turf growth are carefully controlled for each cell.

[0007]

The above-mentioned cell system exerts great power in the maintenance and management of sports turf, but the construction cost becomes extremely high, and the control system for the maintenance and management also requires a great deal of power. There is a problem of increased costs. Therefore, the present invention aims to develop a sports turf that can be constructed at a lower cost and that can efficiently maintain efficient water supply and drainage and turf growing conditions by a simple management method.

[0008]

According to the present invention, an impervious tank having a floor area sufficient to cover the sports turf area is formed below the field soil, and a gravel layer is laid in the impervious tank. It is a sports turf in which a sand layer is laid above and grass is planted on this sand layer, and a water collecting reservoir is formed in the tank by grading the floor surface of the water blocking tank. A drainage pipe that leads from the water reservoir to the water storage tank installed outside the water shield tank and a water supply pipe that connects the water storage tank to the ground inside the water shield tank are installed, and an air diffuser pipe is embedded in the gravel bed layer. Provide sports turf that is designed to deliver air.

[0009]

FIG. 1 is a plan view schematically showing a sports turf according to the present invention, in which a water shield tank 1 having a floor area sufficient to cover the sports turf area is formed below the soil surface of the field. The bottom surface of the water shield tank 1 is provided with a downward slope in the direction shown by the arrow in the figure, and the water collecting reservoir 2 is formed at the deepest position.

The water shield tank 1 is shown in FIG.
As can be seen in the BB cross section, the side surface 3 and the bottom surface 4 are dug down from the ground surface GL (depth of about 25 cm or more).
It was formed by. Both the side surface 3 and the bottom surface 4 are formed of a water blocking layer that blocks the movement of water.
Specifically, the waterproof sheet 5 is provided on the inner surface of the concrete. Unlike the cell system, an independent cell is not provided in the water-blocking tank 1, and the entire plane area corresponds to the sports turf area.

A gravel layer 6 is laid on the lower part of the water-blocking tank 1 and a sand layer 7 is laid on the gravel layer 6, and grass 8 is planted on the surface of the sand layer 7. The gravel layer 9 is provided with an aeration pipe 9 for aeration. If the depth of the impermeable tank 1 is 25 cm, the gravel layer 6 is 12.5 to 15 cm.
The sand tank 7 has a thickness of 12.5 to 15 cm. The gravel tank 6 is composed of gravel or crushed stone having a diameter of about 1 cm, and the sand tank 7 is composed of sand mixed with a soil improving agent such as peat moss, zeolite, and isolite, which is used as a turf soil. In this way, the ground in the water shield tank (turf ground)
Is composed of a lower layer with many voids that easily permeate water and air, and an upper layer that retains water but has high air permeability.

In the example of FIG. 1, the water collecting tank 2 which is the deepest part of the water shield tank 1 is provided on one side near the center line of the sports turf. From this water collecting tank 2 to BB of FIG.
As shown in the schematic cross section, a drainage pipe 12 is provided in a water storage tank 11 provided at the lower part of the grandstand 10, and a water supply pipe 13 leading from the water storage tank 11 to the water shield tank 1 is provided. In the illustrated example, the tip of the water supply pipe 13 is open near the water collecting reservoir 2.

FIG. 4 shows the facilities of the water supply / drainage pipe and the like in more detail. As shown, drain pump 15
The suction end 15 of the drainage pipe 12 in which the is inserted is opened to the water collecting reservoir 2 which is the deepest portion in the water shield tank.
The drainage sucked up by the drive of is taken into the water storage tank 11. Actually, the drain pipe 11 is branched into a main pipe 16 leading to the water storage tank 11 and a manifold 17 leading to a drain groove (not shown) on the discharge side of the drain pump 15, and the main pipe 16 and the branch pipe 17 are interposed. By controlling the opening and closing of the control valves 18 and 19, the water is taken into the water tank 11 at normal times, but when excessive drainage occurs such as during rainfall, the water is discharged to the drain.

A water supply pump 20 is interposed in the water supply pipe 13, and the water in the water storage tank 11 is supplied to the water shield tank by its drive. Unless otherwise specified, the water supply pump 20 and the drainage pump 15 are not driven at the same time, and are alternately driven intermittently. The capacity of the water storage tank 11 is large enough to accommodate the total amount of water contained in the gravel layer 6 and the sand layer 7. This corresponds to about half the volume of the water shield tank 1 before the gravel layer 6 and the sand layer 7 are put therein.

On the other hand, the air diffuser 9 is embedded in the gravel layer 6 as described above, and air is supplied to the air diffuser 9 by the blower 21. This air diffuser 9 is a perforated pipe having a large number of holes, and is installed in the gravel bed layer 6 with a two-dimensional spread so that the air spreads over the entire plane of the water shield tank 1 as shown in FIG. It More specifically, air is sent from the main air supply pipe 22 to the branch header 24 via the main header 23, and then sent from each branch header 24 to each air diffuser pipe 9. In practice, it is preferable to arrange the air diffusers 9 in a grid pattern so that the distance between them is about 1 to 2 m.

An air diffuser 26 is also arranged in the water storage layer 11. In the illustrated example, air is blown from the blower 21 to the air diffuser 9 in the gravel layer 6 and the air diffuser 26 of the water storage tank by controlling the dampers 27 and 28. Air diffuser 2
By bubbling air into the water in the tank by 6,
The dissolved oxygen in the water can be increased and the circulating water can be regenerated. Reference numeral 28 denotes a nutrient solution tank, and the nutrient solution in the nutrient solution tank 28 is added to the stored water in the water tank 11 by operating the control valve 29. As a result, the main nutrients required for turf cultivation are added to the water supply from the water tank.

In the equipment of the present invention having the above-mentioned structure, the control computer 30 automatically manages the water supply / drainage and the operation of the air race. Various sensors for this purpose are installed in the turf ground and in the water tank. That is, the water level sensors 31 and 32 for controlling the upper water level in the turf ground, the water level sensor 33 for detecting the lower water level, the ion meter 34 for detecting nutrient ions in the water in the water tank, and
A pH meter of 35 or the like. Detection signals from these sensors are input to the computer 30, and water supply / drainage, air ration and fertilizer management are performed based on these information.

For example, by intermittent operation of drainage and water supply, the water content of the sand layer 7 is controlled to be less than the water capacity of the field and to be the water content necessary for turf growth. That is, when the detected value of the water level sensor of the water level sensor 31 to 32 is below the set value, the water supply pump 20 is operated to supply the water in the water tank to the water level between the sensors 31 and 32, and Immediately after the water is full, the water supply pump 20 is immediately stopped, and then the drainage pump 15 is driven to start drainage. Then, when the lower water level sensor 33 detects that the water level has dropped to that position, the drainage pump 15 is stopped. Water level sensor 3 again
If 1 and 32 detect less than the set value, the same water supply and drainage are repeated. As a result, the turf ground is always maintained in a moist state that retains an appropriate amount of water.

On the other hand, when it rains, the water supply is stopped and only the drainage operation is performed. In this case, if the lower liquid level detected by the lower water level sensor 33 exceeds the set value, the control valve 19
Is opened, the control valve 18 is closed, and the drainage pump 15 is driven. When the value exceeds the set value, the drainage pump 15 is stopped. In this way, excess water at the time of rainfall is discharged to the outside of the system without being stored in the water storage tank 11.

By controlling this amount of water, water is moved between the turf ground and the water tank, and the amount of water flowing out of the system is almost the same except for the water evaporated from the turf surface. Since it is rare, the amount of nutrients released to the outside of the system is extremely small. Therefore, the nutrients in the water can be maintained and the water can be reused even if the water content is controlled by water supply and drainage according to the present invention. Although the water level in the ground by repeated water supply and drainage are repeated vertically, results harmful gases such as CO ₂ gas in the ground by the upper and lower water level is discharged from the _ground, inhalation to the soil air is promoted It will also happen.
Furthermore, by performing water quality control so that the detection values of the nutrient ion meter 34 and the pH meter 35 are within the set range, fertilization of grass and water supply can be performed simultaneously from the ground side.

Further, by appropriately supplying air from the air supply pipe 9 into the turf ground, oxygen can be forcibly sent to the root portion of the turf in which clogging has occurred or the root deteriorated due to overhumidity. The activity of can be maintained high.

[0022]

As described above, according to the present invention, the growth management of the grass of the sports turf can be favorably performed, and the drainage of the sports turf can be freely performed. The ground structure is simpler and easier to construct than the conventional cell system. Moreover, it is easy to manage because the entire turf area can be fertilized and appropriately watered at the same time by intermittent operation of water supply and drainage. Is. Therefore, according to the present invention, it is possible to provide a high-quality sports turf which is inexpensive in creation cost and operation cost and can be played in a comfortable manner.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a sports turf according to the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.

3 is a schematic sectional view taken along line BB of FIG.

FIG. 4 is a device layout system diagram of a sports turf facility according to the present invention.

FIG. 5 is a schematic plan view showing an arrangement example of air diffusers in the turf ground.

[Explanation of symbols] 1 water barrier tank 2 water collecting reservoir 3 side surface of water barrier tank 4 bottom surface of water barrier tank 5 water blocking sheet 6 gravel layer 7 sand layer 8 turf 9 air diffuser 11 in turf ground water reservoir 12 Drainage pipe 13 Water supply pipe 15 Drainage pump 20 Water supply pump 21 Blower 26 Air diffuser pipe in water storage tank 28 Nutrient solution tank 30 Controlling computer 31, 32, 33 Water level sensor 35 Ion meter 35 pH meter

Claims (5)

[Claims] 1. A water-blocking tank having a floor area sufficient to cover the sports turf area is formed below the soil surface of the field, and a gravel board layer is laid in the water-blocking tank, and then a sand bed layer is laid.
This is a sports turf made by vegetation of grass on the sand layer, and a water collecting reservoir was formed in the tank by grading the floor surface of the water shielding tank, and the water collecting reservoir was installed outside the water shielding tank. A sports facility in which a drainage pipe leading to a water storage tank and a water supply pipe leading from the water storage tank to the ground in the water shield tank are installed, and an air diffuser pipe is embedded in the gravel layer and air is supplied to the air diffuser pipe. Turf. 2. A water level sensor is installed in the turf ground, and water supply / drainage in the turf ground is intermittently operated based on the detection value of the water level sensor, and the water content of the sand layer is adjusted by the vertical movement of this water. The sports turf according to claim 1, wherein the sports turf is formed. 3. The rainwater excessively accumulated in the turf ground is discharged to the outside of the water storage tank through the drain pipe.
Sports turf as described in. 4. A diffusing pipe is provided in the water storage tank, and the air circulating in the diffusing pipe regenerates the water circulating in the turf ground and in the water storage tank.
Sports turf as described in. 5. The sports turf according to claim 1, 2, 3 or 4, wherein the main nutrients required for turf growth are added to the water supply from the water tank.