JP6854736B2 - Lawn evaluation device, lawn evaluation method, and lawn management method - Google Patents

Description

The present invention relates to a lawn evaluation device, a lawn evaluation method, and a lawn management method.

Conventionally, the device described in Patent Document 1 below is known as a technique in this field. This device evaluates the durability of the lawn by swinging the shaft attached to the lower end of the impact unit on the lawn and bringing the impact unit into contact with the lawn.

Japanese Unexamined Patent Publication No. 2000-214011

However, the method of Patent Document 1 as described above requires a relatively large-scale device, and it is difficult to easily evaluate the state of the lawn. There is also concern about damage to the lawn. For example, when managing a lawn for sports, it is preferable to evaluate the soundness of the lawn at a large number of measurement points at small intervals. Therefore, it is desirable that the evaluation work is easy to carry out and does not damage the lawn as much as possible.

An object of the present invention is to provide a lawn evaluation device, a lawn evaluation method, and a lawn management method that can be easily carried out and damage to the lawn can be suppressed.

The lawn evaluation device of the present invention is a lawn evaluation device that evaluates the soundness of a lawn installed on the ground, and has a main body portion in which the lower portion is penetrated into the ground and a main body portion in which the lower portion is penetrated into the ground. It is provided with an external force measuring unit that measures an external force applied to the main body so as to tilt with respect to the penetration direction, and an angle regulating unit that regulates the rotation angle of the main body due to the application of the external force to a predetermined angle.

In lawns, the density of roots on the ground can be an indicator of lawn health. Here, consider a case where the lower portion of the main body of the lawn evaluation device of the present invention is penetrated into the ground and an external force is applied to tilt the main body. In this case, there is a correlation between the density of the roots of the lawn stretched on the ground and the magnitude of the external force. That is, the higher the root density, the larger the required external force, and the lower the root density, the smaller the required external force. Therefore, according to the above-mentioned lawn evaluation device, the density of lawn roots can be quantitatively evaluated by a simple operation such as penetrating the lower part of the main body into the ground, tilting it at a predetermined angle by an external force, and measuring the external force. As a result, the health of the lawn can be evaluated quantitatively. Further, since the rotation angle of the main body portion is regulated by the angle regulating portion, the above operation can be performed with good reproducibility. Further, the area of the lawn damaged at this time is considered to be slightly larger than the cross-sectional area of the lower part of the main body portion, and the damage to the lawn can be suppressed.

The external force measuring unit may have a maximum value saving function for storing the maximum value of the applied external force. In this case, the maximum value of the external force while the main body is rotated by the external force can be used as an evaluation index of soundness.

The external force measuring unit may be a tensile force measuring tool rotatably connected to the main body unit. Since this type of tensile force measuring tool can be configured by using a small general-purpose measuring tool, the device can be easily handled and moved.

The angle control unit is provided on the main body, and is located above the ground with the lower part of the main body penetrating into the ground. When the rotation angle of the main body reaches a predetermined angle due to the application of an external force, the ground It may have a ground contact portion that comes into contact with. With this configuration, the rotation angle due to the external force of the main body can be regulated by a simple configuration.

The lawn evaluation device of the present invention is a lawn evaluation device that penetrates the ground on which the lawn is installed to evaluate the soundness of the lawn, and has a main body portion having a rod-shaped penetration portion capable of penetrating the ground at the bottom and a penetration portion. It is provided with a lateral overhanging portion provided on the main body portion so as to project in a direction intersecting the penetration direction of the portion into the ground, and a tensile force measuring tool rotatably connected to the main body portion.

The lawn evaluation method of the present invention is a lawn evaluation method for evaluating the soundness of a lawn installed on the ground, which includes a penetration step of penetrating the lower part of a predetermined device into the ground in a predetermined penetration direction and an external force applied to the device. The lawn is evaluated for the soundness of the lawn based on the measured values obtained in the external force measurement process, which includes an external force application process of applying and tilting the instrument with respect to the penetration direction and an external force measurement process of measuring the external force.

When the lower part of the instrument is penetrated into the ground and an external force is applied to tilt the instrument, the higher the density of the roots of the lawn stretched on the ground, the larger the required external force, and the lower the root density, the smaller the required external force. Therefore, according to the above-mentioned lawn evaluation method, the density of the roots of the lawn can be quantitatively evaluated by a simple operation such as penetrating the lower part of the instrument into the ground, tilting it with an external force, and measuring the external force. The soundness can be evaluated quantitatively. In addition, the area of the lawn damaged at this time is considered to be slightly larger than the cross-sectional area of the lower part of the instrument, and damage to the lawn can be suppressed.

In the penetration step, the penetration direction of the device may be a direction substantially orthogonal to the ground. In this case, since the operation of tilting the instrument by an external force is started from a state in which the instrument is substantially orthogonal to the ground, it is unlikely that the lawn will roll up and the damage to the lawn will be suppressed.

In the external force applying step, the external force is a tensile force in a direction substantially parallel to the ground, and may be applied to a portion of the instrument located above the ground. In the operation of pulling a part of the instrument substantially parallel to the ground, an external force can be appropriately applied as compared with the operation of pushing the instrument, for example.

The lawn management method of the present invention is a lawn management method installed on the ground, and manages the lawn using the measured value of the external force by any of the above evaluation methods as a management standard.

According to the present invention, it is possible to provide a lawn evaluation device, a lawn evaluation method, and a lawn management method that can be easily carried out and damage to the lawn can be suppressed.

It is a front view which shows the lawn evaluation apparatus which concerns on embodiment. (A) to (c) are diagrams showing the usage state of the lawn evaluation device.

Hereinafter, an embodiment of the lawn evaluation device, the lawn evaluation method, and the lawn management method according to the present invention will be described in detail with reference to the drawings. In the following, when words such as "right", "left", "upper", and "lower" are used to explain the positional relationship, they shall correspond to the left-right direction and the up-down direction of the states shown in each drawing. ..

The lawn 50 (see FIG. 2) to be evaluated or managed in the present embodiment is a sports lawn installed on the ground in a sports facility (for example, a baseball field, a soccer field, a golf course, etc.). The lawn 50 is installed on the artificially created floor soil in a sports facility and has roots to a predetermined depth. The layer in which the roots of the lawn 50 stretched under the ground form a mat shape is called a root mat layer 51, and the thickness of the root mat layer 51 may be called an effective soil thickness. For sports turf, it is important to evaluate and manage the health of the turf so that it is not easily damaged or peeled off by the force acting in the competition. The density of lawn roots in the root mat layer 51 can be an indicator of lawn health.

FIG. 1 is a front view of the lawn evaluation device 1 according to the embodiment, and FIGS. 2 (a) to 2 (c) are views showing a usage state thereof. The lawn evaluation device 1 includes a metallic main body 3 (instrument) and a load meter 5 (external force measuring unit, tensile force measuring tool) connected to the upper part of the main body 3. The main body 3 is made of a metal rod. The main body portion 3 has a rod-shaped penetration portion 7 extending vertically and vertically, and a handle portion 9 provided in a ring shape at the upper end of the penetration portion 7. The penetration portion 7 is formed of, for example, a metal round bar having a diameter of about 5 mm. Further, the main body portion 3 has a side guide portion 11 (angle regulating portion, lateral overhanging portion) that projects to the left from the upper end of the penetration portion 7. The side guide portion 11 is a rod-shaped portion extending linearly in a direction intersecting the penetration portion 7. The side guide portion 11 may be orthogonal to the penetration portion 7. The penetration portion 7, the handle portion 9, and the side guide portion 11 integrally form the main body portion 3, and the penetration portion 7, the handle portion 9, and the side guide portion 11 do not displace each other.

The load meter 5 measures the tensile force acting between the hook-shaped loading portion 13 and the handle portion 15. As the load meter 5, a small general-purpose mechanical spring scale or the like can be adopted. The loading portion 13 of the load meter 5 is rotatably connected to the left end of the handle portion 9. As an example of the connection structure between the loading portion 13 and the handle portion 9, a small ring 17 is joined to the left end of the handle portion 9, and the small ring 17 and the loading portion 13 are connected via the swivel metal fitting 19. Due to the clearance between the small ring 17 and the swivel metal fitting 19, the rotary joint of the swivel metal fitting 19, and the clearance between the swivel metal fitting 19 and the loading portion 13, the load meter 5 freely rotates in the biaxial direction with respect to the main body portion 3. be able to. The swivel metal fitting 19 is not limited to this, and for example, the loading portion 13 and the small ring 17 may be connected by a string or the like.

Subsequently, a lawn evaluation method using the above-mentioned lawn evaluation device 1 will be described with reference to FIG. In this lawn evaluation method, the penetration step, the external force applying step, the external force measuring step, and the evaluation step described below are executed in order. In the example described below, it is assumed that the ground 60 on which the lawn 50 is installed is horizontal.

(Penetration process)
In the penetration step, as shown in FIG. 2A, the lower portion of the penetration portion 7 of the main body portion 3 is penetrated into the ground 60. The penetration direction is a direction orthogonal to the ground 60 (here, vertically downward). The penetration depth L1 of the penetration portion 7 is predetermined. In this way, when the penetration portion 7 is penetrated at a penetration depth L1 at a right angle to the ground 60, the side guide portion 11 is positioned upward away from the ground 60. The penetration portion 7 is provided with a mark 21 (see FIG. 1) at a position at a distance L1 from the lower end. As a result, the operator can penetrate the penetration portion 7 with an accurate penetration depth L1 while checking the mark 21. As shown in the figure, the operator can easily execute the penetration step by grasping the handle portion 9 of the main body portion 3. By this intrusion step, the lower part of the intrusion portion 7 enters the root mat layer 51 of the lawn 50. The penetration depth L1 is set to, for example, 5 cm so that the properties of the root mat layer 51 are accurately reflected in the evaluation result. Hereinafter, the portion of the intrusion portion 7 that has penetrated into the ground 60 will be referred to as an intrusion portion 7a.

(External force application process)
In the external force applying step, an external force is applied to the main body 3 to tilt the main body 3 with respect to the penetration direction (vertical direction). Specifically, as shown in FIG. 2B, the operator slowly pulls the handle portion 15 of the load meter 5 in a direction parallel to the ground 60 (horizontal direction). Then, the main body 3 is pulled via the load meter 5, rotates counterclockwise, and tilts in the vertical direction. Further, the main body 3 not only rotates as described above, but also slightly translates to the left. At this time, the penetration portion 7a rotates and translates while receiving the resistance force of the surface layers of the root mat layer 51 and the lawn 50, and this resistance force corresponds to the tensile force of the handle portion 15 by the operator. As shown in FIG. 2C, such a pulling operation of the handle portion 15 is continued until the rotation angle of the main body portion 3 reaches a predetermined angle α while maintaining the pulling direction horizontally, and the angle α It ends when it reaches.

Here, in order for the operator to accurately know that the rotation angle of the main body 3 has reached the angle α, the side guide portion 11 of the main body 3 is set as follows. That is, when the main body portion 3 is rotated by an angle α counterclockwise by the above tension operation, the tip portion 11a (grounding portion) of the side guide portion 11 is set so as to come into contact with the ground 60. In order to realize this setting, the length of the side guide portion 11 may be appropriately adjusted based on the geometrical consideration.

With the above configuration, the rotation angle of the main body 3 by the tension operation is regulated so as to be exactly the angle α. Further, when the tip end portion 11a of the side guide portion 11 abuts on the ground 60, further rotation of the main body portion 3 is prevented. The operator may end the pulling operation when the tip portion 11a of the side guide portion 11 reaches the ground 60. Further, since excessive rotation of the main body portion 3 is avoided, it is possible to prevent the intrusion portion 7a from damaging the lawn 50 more than necessary (for example, the lawn 50 is rolled up). The angle α is set to, for example, 20 to 30 °.

(External force measurement process)
In the external force measuring step, the magnitude of the external force applied in the above-mentioned external force applying step is measured. Specifically, the maximum value of the tensile force (hereinafter referred to as "maximum tensile force value") while the tensile operation is continued is acquired. That is, the maximum tensile force from the state in which the penetration portion 7a of the main body 3 is vertically penetrated into the ground 60 until the small ring 17 of the main body 3 is subjected to a horizontal tensile force to tilt the main body 3 by an angle α. The value is the maximum tensile force. Since the tensile force at each moment during the tension operation is always displayed as the load on the load meter 5, the operator can always visually check the load value display of the load meter 5 during the tension operation to obtain the maximum tensile force. You may get it.

Further, the load meter 5 may have a maximum value saving function for storing the maximum value of the measured load. In this case, the maximum value of the tensile force generated during the tensile operation is stored, and the stored maximum value can be obtained as the maximum tensile force value. Therefore, it is not necessary for the operator to perform a complicated operation of reading the scale of the load meter 5 while performing a tension operation. For example, as the load meter 5, as shown in FIG. 1, a type having a load scale 23 and a load pointer 27 that mechanically moves on the load scale 23 according to a load can be used. it can. In this case, the maximum value saving function can be realized by providing a top (not shown) that is irreversibly pushed to the high load side by the load pointer 27 on the load scale plate 23. Further, an electronic scale may be adopted as the load meter 5. In this case, the maximum value storage function may be realized by a control program built in the electronic scale.

(Evaluation process)
In the evaluation step, the soundness of the lawn 50 is evaluated based on the maximum tensile force obtained in the external force measurement step. Specifically, the correlation between the maximum tensile force and the soundness of the lawn has been known by prior tests and the like. For example, when the maximum tensile force is F2 to F3 [N], it can be appropriately used as a sports lawn, and when the maximum tensile force is less than F1 [N], it cannot be used as a sports lawn. Information such as that when the value is larger than F4 [N], update processing is required due to clogging is known as a correlation. In light of this known correlation, the soundness of the lawn is evaluated based on the maximum tensile force obtained in the external force measurement step.

Since the numerical values of F1, F2, F3, and F4 in the above correlation depend on the dimensions and the like of each part of the main body portion 3, it may be determined by conducting a test in advance for each specification of the main body portion 3. That is, the correlation between the maximum tensile force and the soundness of the lawn is the length L1 of the penetration portion 7a, the diameter D of the penetration portion 7a, and the horizontal distance between the penetration portion 7 and the small ring 17 as shown in FIG. It is considered that it depends on L2, the height difference L3 between the upper end (mark 21) of the penetration portion 7a and the small ring 17. Therefore, the dimensions of each part of the main body 3 as described above may be changed as appropriate, but in this case, it is necessary to prepare a correlation (values of F1 to F4) corresponding to the dimensions by a preliminary test or the like.

Further, the above correlation is that the initial state in the external force applying step is a state in which the ground 60 and the intrusion portion 7 are orthogonal to each other, the pulling direction in the external force applying step is parallel to the ground 60, and the pulling operation is performed by the main body portion 3. It is considered that it depends on the measurement conditions such as performing until the moving angle reaches the angle α. Therefore, the above measurement conditions may be changed as appropriate, but in this case, it is necessary to prepare a correlation (values of F1 to F4) corresponding to the measurement conditions by a preliminary test or the like.

Subsequently, a lawn management method using the above-mentioned lawn evaluation method will be described. In this lawn management method, the lawn is managed using the maximum tensile force obtained by the above-mentioned lawn evaluation method as a management standard. For example, in the lawn management method, the lawn of a sports facility is evaluated by the above-mentioned lawn evaluation method for each measurement point set at a predetermined interval (for example, 3 m interval). For example, in an area where players frequently exist during a competition (for example, a fixed position of a baseball defense), the interval between measurement points may be narrowed. In the region where the maximum tensile force is less than F2 or larger than F3, necessary measures are taken for the lawn and managed so that the maximum tensile force F2 to F3 is maintained.

Subsequently, the action and effect of the lawn evaluation device 1, the lawn evaluation method, and the lawn management method of the present embodiment will be described.

In lawns, the density of roots on the ground can be an indicator of lawn health. When the penetration portion 7a of the lawn evaluation device 1 is penetrated into the ground 60 and the main body 3 is tilted by an external force, there is a correlation between the density of the roots of the lawn 50 stretched on the ground 60 and the magnitude of the external force. It is thought that there is. That is, it is considered that the higher the root density, the larger the required external force, and the lower the root density, the smaller the required external force.

Therefore, according to the lawn evaluation device 1 and the lawn evaluation method described above, the lawn in the root mat layer 51 can be measured by a simple operation such as penetrating the lower part of the main body 3 into the ground 60, tilting it at a predetermined angle by an external force, and measuring the external force. The density of the roots of 50 can be quantitatively evaluated, and thus the health of the lawn 50 can be quantitatively evaluated. Further, since the rotation angle of the main body 3 is regulated by the side guide 11 of the main body 3, the above operation can be performed with good reproducibility. Further, the area of the lawn 50 damaged by the above operation is considered to be slightly larger than the cross-sectional area of the intrusion portion 7a, and the damage to the lawn 50 is also suppressed.

Since the lawn evaluation device 1 uses relatively small and lightweight elements such as a main body 3 made of a metal rod and a small general-purpose load meter 5, it is easy to handle and move. Therefore, it becomes easy to measure while moving a large number of measurement points on the sports lawn.

In the penetration step, the penetration direction of the penetration portion 7a penetrates the penetration portion 7a in a penetration direction substantially orthogonal to the ground 60. According to this, since the external force applying process is started from the state where the intrusion portion 7a is substantially orthogonal to the ground 60, the possibility that the lawn 50 is rolled up by the movement of the intrusion portion 7a is low, and the damage to the lawn 50 is suppressed. ..

In the external force applying step, an external force for tilting the main body 3 is applied by pulling the upper portion of the main body 3 substantially parallel to the ground 60. In this way, in the operation of pulling the main body 3 substantially parallel to the ground 60, an external force can be appropriately applied as compared with the operation of pushing the main body 3, for example.

By using the evaluation by the lawn evaluation method of the present embodiment, the lawn management method of the present embodiment can manage the lawn easily and while suppressing damage to the lawn.

The present invention can be carried out in various forms having various modifications and improvements based on the knowledge of those skilled in the art, including the above-described embodiment. It is also possible to construct a modified example of the embodiment by utilizing the technical matters described in the above-described embodiment. The configurations of the respective embodiments may be combined and used as appropriate.

For example, in the embodiment, the description has been made on the premise that the lawn to be evaluated and managed is a natural lawn, but the present invention is similarly applicable to an artificial lawn. Further, in the embodiment, the load meter 5 can rotate in the biaxial direction with respect to the main body 3, but if the tensile direction in the external force applying step can be maintained in the direction parallel to the ground 60, the uniaxial direction It may be rotatable only. For example, in FIG. 2, the main body 3 and the load meter 5 may be connected via a hinge having an axis orthogonal to the paper surface. Further, it is not essential that the main body 3 is integrally formed as in the embodiment, and the main body 3 may be composed of a combination of a plurality of members.

Further, it is not essential to penetrate the penetration portion 7 at a right angle to the ground 60 in the penetration step. That is, as the initial state before applying the external force in the external force applying step, the ground 60 and the intrusion portion 7 do not have to be orthogonal to each other. For example, in the external force applying step, the main body portion 3 inclined from the vertical direction to the right at an angle α / 2 is pulled to the left until it is inclined to the left at an angle α / 2. Good. However, in this case, as described above, it is necessary to prepare the correlation between the maximum value of the tensile force due to the above-mentioned tensile operation and the soundness of the lawn by a preliminary test or the like. Further, although the penetration portion 7a has a round bar shape in the embodiment, the shape is not limited to this shape, and the shape of the penetration portion 7a may be appropriately adjusted in order to adjust the resistance force from the root mat layer.

1 ... Lawn evaluation device, 3 ... Main body (apparatus), 5 ... Load meter (external force measuring part, tensile force measuring tool), 11 ... Side guide part (angle regulating part), 11a ... Tip part (grounding part), 50 ... lawn, 60 ... ground.

Claims (9)

It is a lawn evaluation device that evaluates the soundness of the lawn installed on the ground.
The main body, whose lower part penetrates into the ground,
An external force measuring unit that measures an external force applied to the main body so as to incline the main body with the lower portion penetrated into the ground with respect to the penetration direction.
A lawn evaluation device including an angle regulating unit that regulates the rotation angle of the main body portion by applying an external force so as to be a predetermined angle. The lawn evaluation device according to claim 1, wherein the external force measuring unit has a maximum value saving function for storing the maximum value of the applied external force. The lawn evaluation device according to claim 1 or 2, wherein the external force measuring unit is a tensile force measuring tool rotatably connected to the main body. The angle control unit
It is provided on the main body and is located above the ground with the lower part of the main body penetrating the ground.
The lawn evaluation device according to any one of claims 1 to 3, further comprising a ground contact portion that comes into contact with the ground when the rotation angle of the main body portion reaches a predetermined angle due to the application of the external force. It is a lawn evaluation device that penetrates the ground on which the lawn is installed and evaluates the soundness of the lawn.
A main body with a rod-shaped penetration that allows the lower part to penetrate the ground,
A lateral overhanging portion provided on the main body portion so as to project in a direction intersecting the intrusion direction of the intruding portion into the ground, and a lateral overhanging portion.
A lawn evaluation device including a tensile force measuring tool rotatably connected to the main body. It is a lawn evaluation method that evaluates the soundness of the lawn installed on the ground.
A penetration step of penetrating the lower part of a predetermined instrument into the ground in a predetermined penetration direction,
An external force applying step of applying an external force to the device and tilting the device with respect to the penetration direction,
The external force measuring process for measuring the external force is provided.
A lawn evaluation method for evaluating the soundness of the lawn based on the measured values obtained in the external force measurement step. In the penetration step,
The lawn evaluation method according to claim 6, wherein the penetration direction of the device is a direction substantially orthogonal to the ground. In the external force applying step,
The lawn evaluation method according to claim 6 or 7, wherein the external force is a tensile force in a direction substantially parallel to the ground and is applied to a portion of the instrument located above the ground. It is a method of managing the lawn installed on the ground.
A lawn management method for managing the lawn using the measured value of the external force according to the evaluation method according to any one of claims 6 to 8 as a management standard.

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