JPH0617403A - Mixture for surface layer in sports facilities etc. - Google Patents

Abstract

PURPOSE:To increase the capacity of a paved surface by adding and mixing a bonding agent, neutralizer, and fine aggregate with wood chip, etc., and also specifying a bonding agent mixing ratio. CONSTITUTION:An emulsion type or solution type bonding agent and a neutralizer are added and mixed with wood chip or wood fiber. Next, fine aggregate is added at need. The bonding agent is 10 to 70% by weight of the weight of dried wood fiber. Then the mixture is laied down on a ground, made even, and rolled pressingly. Thus, an all weather type course pavement on which man and race horse can run very easily is formed because it relieves shock load and has water permeability, and also it is not dug excessively by a hoof and dispersion of sand and dust during running and soil contamination by wood chip sap can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface layer mixture used for the surface layer of a ground or a course in a jogging course, a racehorse course in a racetrack, or a sports facility established mainly for running. Is.

[0002]

2. Description of the Related Art When a person runs at full speed, the foot is subjected to an impact of about eight times the weight. Therefore, the surface of a leisure facility such as a running facility, a flying facility, or a bouncing facility in a sports club or the like, and the surface layer of a jogging road are different from those of ordinary asphalt pavement. That is, it is necessary that the surface layer has a cushioning property capable of relieving an impact load when the athlete exercises, a rigidity generating an instantaneous reaction force, and a water permeability for aiming at all weather conditions. There are high demands on the jogging road, which is set up for the purpose of running, and on the surface of the course where racehorses run.

Incidentally, the surface layers of racehorse courses which are commonly used at present are a grass course and a dirt course. Therefore, for example, when a racehorse runs on this turf course, an impact acceleration of 80 to 100 gal is applied to the course road surface, and in the case of a dirt course, an impact acceleration of 40 to 60 gal is applied. (Measurement of Japan Central Horse Racing Association). In other words, the racehorse is running while enduring an extremely severe impact with each run. Therefore, along with the widespread use of horse racing, the health management of race horses has been emphasized, and the development of the surface layer of the course having a cushioning property has been demanded. Of course, the surface of the jogging course, which is recommended as one of the health management, is no exception.

In order to meet these demands, the applicant first developed a surface layer having a wood chip as a main material (Japanese Patent Laid-Open No. 2-288505) as a surface layer having cushioning properties and water permeability. The first feature of the developed mixture for the surface layer containing wood chips as a main material is to pay attention to the elasticity and water permeability of the wood material. The second point is the effective utilization of resources by processing the wood discharged as thinned wood and construction waste wood into wood chips, and then using them as so-called wood chip materials or wood fiber materials. It is at the point I was aiming for. Furthermore, the third point is that wood chips processed into chips or fibers are mixed with sand or volcanic ash at a predetermined ratio, laid on the roadbed and leveled, and synthetic rubber or synthetic rubber is applied to the surface. The point is that a resin-based adhesive is applied or sprinkled to solidify and stabilize the surface layer portion. As a result, the developed surface layer mixture was able to exert its effect as a surface layer having extremely high elasticity, that is, high buffering property and having water permeability.

[0005]

However, since the surface layer mixture containing wood chips or wood fibers as the main material only solidifies and stabilizes only the upper layer portion as described above, it has no durability or abrasion resistance. There was a problem. That is, since the impact force of the racehorse during running is large as described above, there is a problem that the upper layer portion is peeled off relatively early. Especially in the case of racehorses, the surface layer is dug up to a depth of 15 to 20 cm over time, and wood chips and fiber fragments are scattered. Especially on dry days, they become dust and scatter around. There was a problem. In other words, there was a problem that it took too much time to maintain and manage the surface of the course. Furthermore, since it is a wood material, the highly acidic sap contained in the chips exudes into the ground, so-called soil pollution, and even the outflow to rivers etc. via groundwater, etc.
Problems were raised that could cause environmental pollution. By the way, Table I shows that when wood fiber is used as the main material, various resin adhesives are added and kneaded, and this kneaded material is laid on the roadbed as a paving mixture and leveled, and the pH when the paving is performed by rolling. It shows the measured value over time.

[0006]

[Table 1]

As can be seen from Table I, when paving with wood fiber, that is, wood as the main material,
After 3 days, 7 days, 30 days, 90 days after paving,
It was confirmed that the acidity tends to increase. In other words, it turned out that there is a risk of environmental pollution of the soil.

In view of the above, the present invention solves these problems and difficulties, reduces the impact load caused by running, and eliminates the fear of environmental pollution, and mainly uses wood chips or wood fibers. It was developed for the purpose of providing a mixture for the surface layer of a jogging road and a course on a racetrack.

[0009]

As a means for solving the above problems and difficulties, the present invention takes the following means. First, in order to prevent the harmful effects of peeling off the upper layer, scattering wood chips or wood fibers, and digging up the upper layer, wood chips such as wood chips or wood fibers, which are the main materials, are either emulsion type or solution type. The binder is added and kneaded, and this kneaded product is spread as a surface layer mixture on a course roadbed and leveled,
The present invention is to make a mixture capable of paving a course covering made of wood chips or wood fibers, which is compressed and has all the covering thicknesses fixed using the binder as a binder.

The second point is to add a fine aggregate to a kneaded product obtained by adding an emulsion type or solution type binder to the wood chips or wood fibers as a means for enhancing the durability and wear resistance of the surface covering itself. It is to mix and mix them to make a mixture of the covering materials. That is, the wood chips or wood fibers, the fine aggregate, and the binder are mixed and kneaded to form a mixture for covering.

The third point is to neutralize an acidic substance which exudes from the wood chips or wood fibers and causes soil pollution and the like. It is characterized in that it is made into a mixture for surface covering by adding a solvating agent and mixing. That is, the sap that leaches out is treated with a neutralizing agent to prevent soil contamination and the like in advance.

[0012]

As described above, the present invention uses a wood material as the main material of the outer cover, that is, a wood chip or wood fiber exhibiting elasticity and water permeability, and connecting it over all layers of the outer cover thickness. Therefore, compared to the conventional pavement where only the upper layer was fixed with a synthetic rubber material,
It was able to demonstrate its elasticity and, in other words, its excellent cushioning effect. In particular, since the entire surface thickness is fixed by a binder, that is, a binder, even if it is used for course surface mounting on a racetrack, for example, due to the hoof of a racehorse,
The surface was no longer dug up. Furthermore, since the neutralizing agent was added in advance, the strongly acidic exudate was neutralized, and as a result, it was avoided that the surrounding soil was contaminated after paving.

[0013]

EXAMPLES Further, the present invention will be specifically described based on examples. First, in the first example, the thinned material was processed by a cutter into chips. At that time, the shape and size of the chip were set to have a length and width of 5 cm and a thickness of 0.5 cm. Then, as the binder, as shown in Table 2 below, five kinds of emulsion type adhesives were used, respectively. The amount of the binder added was 30% by weight based on the dry weight of the chip material. Then, this was mixed by a tilting type mixer and sufficiently kneaded until the surface of the chip material was coated with the emulsion type binder. The kneaded material is used as a surface layer mixture and a thickness of 25 cm on the roadbed forming the course of the racehorse.
I laid it evenly. After laying and leveling, the surface was finished flat and the surface was rolled with a rolling roller of 3 tons to complete the paving as the course pavement. After a week of curing after paving, the racehorses were run. In this example, a series of operations from the kneading process to the paving on the roadbed was continuously carried out at the pavement site, but the mixture obtained by kneading was kept at room temperature for a certain period of time, specifically about 1 week. It may be stocked in a storage bottle, etc. underneath, and then carried into the paving site for paving. In this case, the time until release is shortened.

[0014]

[Table 2]

Table 2 shows the type of binder used to immobilize the wood chips, the depth of the hoof traces formed on the pavement surface as a result of running the racehorse after paving, and the pavement surface by the hoof. The data of the result of having measured the scattering distance of the mixture for surface layers scraped off from is shown. In addition, the lowermost row in Table 2 shows the measurement data of the conventional wood chip pavement, that is, the pavement in which only the upper layer portion is fixed with the synthetic rubber or the resin adhesive.

As can be seen from Table 2, the depth of the hoof traces formed on the pavement surface and the pavement surface are all because the present invention fixes all the surface layers with the binder as the binder. It has been proved that the scattering distance of the surface layer mixture scraped off by the hoof is reduced, and it functions as a course pavement with high stability and excellent cushioning property. Although the emulsion type binder is used in the embodiment as described above, a solution type binder may be used as long as it can strongly bond the chip material or the fiber material. There is only a slight difference in the curing period.

Table 3 shows pavement characteristics based on the second embodiment when fine aggregate is added to wood chips or wood fibers in order to improve durability and wear resistance as a course pavement. That is, it is an example in the case of a mixture for the surface layer in which a binder is added to a mixture of wood chips or wood fibers and fine aggregate. In addition, the wood fiber is further processed by pressing the wood chips into a crusher of a press type, and the length is 4 cm, the width is 0.8 cm, and the thickness is 0.3 cm.
The re-processed so-called wood fiber having the above fibrous shape was used. As fine aggregate, No. 6 silica sand was added at a weight ratio of 15% to the dry weight of the wood fiber and mixed with a tilting mixer, and as a binder, the emulsion type shown in Table 3 was used. Three kinds of binders were added and kneaded to obtain a so-called surface layer mixture. As for the procedure of paving, the kneaded material was laid on the course roadbed to have a thickness of 20 cm as in the above case, the surface was flattened, and then the paving was completed by rolling with a 4-ton roller. And it was released after a week of curing.

[0018]

[Table 3]

Table 3 shows the measurement data of the depth of the hoof traces formed on the surface layer and the scattering distance of the surface layer mixture scraped off from the pavement surface when the racehorse was actually run on the paved course. It is shown. In addition, the lowermost row of Table 3 is the measurement data of the pavement by the wood fiber in which only the upper layer portion is fixed for comparison, as in the case of the first embodiment. The depth of the hoof,
The scattering distance of the surface layer mixture was reduced to about 1/2 in all cases. The effect of adding fine aggregate was also clearly demonstrated.

[0020]

[Table 4]

Table 4 shows the measurement data of the impact acceleration in the course pavement constructed by the first and second embodiments. The impact acceleration varies slightly depending on the surface layer thickness. The minimum value of the impact acceleration is 4
At 6, the highest value is 61. That is, the pavement has a shock acceleration lower than 80 to 100 on a conventional turf course and has a cushioning property as good as a dirt course for a racehorse. That is, it was proved that the surface layer had a small impact load during running. The measurement of the impact acceleration was based on the cushioning measurement method (impact acceleration) by the Japan Central Horse Racing Association.

[0022]

[Table 5]

Table 5 shows the results of measuring the pH value over time in order to confirm the effect of adding the neutralizing agent to the surface layer mixture. Although lime was used as the neutralizing agent in the examples, the present invention is not limited to this. Further, the neutralizer was added in a weight ratio of 40% with respect to the dry weight of wood chips or wood fibers. As a result, as shown in Table 5,
It was proved that the value decreased and the anxiety such as so-called soil pollution was resolved.

FIG. 1 shows a cross-sectional structure of a pavement for which a surface course mixture using wood chips according to the present invention has been used for paving a racecourse. From the impact acceleration and the like shown in Examples 1 and 2 above, it was concluded that it is preferable to set the surface layer thickness to about 15 to 25 cm for paving. In any case, in the present invention, the main material is wood chips or wood fibers,
Since fine aggregate, binder, and neutralizer are added to this and kneaded to pave, the entire surface layer is fixed, and as a result, the following pavements for jogging roads and race horses It can exert its utility.

[0025]

EFFECTS OF THE INVENTION (1) Since the main material of the surface layer mixture is a wood material made of wood chips or wood fibers having elasticity and water permeability, the buffer property is improved, and due to the water permeability function, the surface layer is weatherproof. Suitable as a mixture. Therefore, when the surface layer mixture is applied to a jogging road or a course on a racetrack, the impact load on a person or a racehorse is alleviated, and the water-permeable property makes it possible to obtain an all-weather course pavement that is extremely easy to run. (2) Since wood chips or wood fibers have a structure in which the entire surface thickness is solidified with a binder, the upper pavement layer is not excessively excavated by hoofs, and maintenance of the course pavement is maintained. It has become easier compared to the conventional jogging roads and turf courses at racetracks. In addition, even when compared to the dirt course, water permeability was suppressed, and scattering of sand dust during running was also suppressed, making it possible to obtain a course that is easy to run. (3) Since the neutralizing agent was added, soil pollution and the like caused by the sap flowing out from the wood chips or wood fibers was suppressed.

[0026]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a course pavement in a racetrack paved with a surface layer mixture according to the present invention.

Claims (3)

[Claims] 1. A surface layer mixture in a sports facility or the like, which comprises a mixture obtained by adding an emulsion-type or solution-type binder to wood chips or wood fibers, and further adding a neutralizing agent and kneading the mixture. 2. The surface layer mixture in a sports facility or the like according to claim 1, wherein fine aggregate is added to the mixture. 3. The surface layer mixture in a sports facility or the like according to claim 1 or 2, wherein the binder is 10 to 70% by weight based on the dry weight of wood chips or wood fibers.