JP2005098033A - Paving elastic mat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paving elastic mat capable of being constituted by using wood chip, being constructed around a sidewalk of a park, a promenade, a jogging course and a recreation facility or the like, constructing a paving road with a further simple construction and further excellent in durability without separation and fall of the chip. <P>SOLUTION: The paving elastic mat (1) is a plate-like mat constructed for carrying out the paving finish, and it is equipped with a core material layer (2) formed by connecting a large number of wood chips to each other with a resin adhesive and a surface layer (3) formed by connecting a large number of rubber chips to each other with the resin adhesive. In the paving elastic mate (1), moisture content of the wood chip forming the core material layer (2) is 5 to 40 wt.%, and percentage of void in the core material layer (2) and the surface layer (3) is not more than 40%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an elastic mat for paving, and more particularly to an elastic mat for paving that can easily construct a paved road comfortable for walking by laying it on a sidewalk or promenade in a park.

Waste wood discharged as building waste has a large amount of emission to be treated as industrial waste and has a great impact on the environment. Therefore, its reuse has been studied in various fields. One method for effectively using waste wood is a method of using it as a paving material laid on a sidewalk or a promenade in a park. For example, a technology that uses wood as a pavement material is a “paving material” made by crushing wood (red pine bark) into chips and mixing the resulting wood chips with rubber chips. A resin adhesive is spread and laid. Since the pavement using the above-mentioned pavement material is mixed with rubber chips, it has elasticity suitable for walking.
Japanese Patent Laid-Open No. 9-242006

  By the way, pavement materials using wood chips as described above must be pre-sprayed with resin adhesive on the roadbed, and then a mixture of wood chips and rubber chips must be further sprayed on it. In addition, there is a concern that the working environment is deteriorated and the adhesive force is not uniform due to the dispersion of the resin adhesive. Further, depending on the degree of drying of the wood chips to be used, there is a problem that the adhesive force between the chips is weak, the wood chips are peeled off, and the road surface is cracked. Furthermore, since the deterioration of the chips proceeds by absorbing rain water, there is a problem that the wood chips are more easily separated from the paved surface.

  The present invention has been made in view of the above circumstances, and an object thereof is an elastic mat for pavement constructed using wood chips, which can construct a paved road with simpler construction, It is an object of the present invention to provide an elastic mat for pavement that is superior in durability without peeling off or falling off.

  In order to solve the above-mentioned problems, the elastic mat for paving of the present invention is a plate-like elastic mat for paving to finish paving, and many wood chips are bonded to each other with a resin adhesive. Comprising a core layer formed from the above and a surface layer in which a large number of rubber chips are bonded to each other with a resin adhesive, and the moisture content of the wood chips constituting the core layer is 5 to 40% by weight, The porosity in the core material layer and the surface layer is 40% or less.

  In the above-mentioned elastic mat for pavement, the structure formed in a plate shape in advance is excellent in workability in laying work, and enables simple construction such as laying. Moreover, the laminated structure of the core material layer made of wood chips and the surface layer made of rubber chips exhibits elasticity suitable for walking. Furthermore, in the core material layer, the wood chip having a specific water content exhibits a high bonding force due to the resin adhesive. In addition, the core material layer and the surface layer having a specific porosity exhibit water permeability to rainwater, and the surface layer made of rubber chips fixes the wood chips on the surface of the core material layer.

  According to the elastic mat for pavement of the present invention, it can be laid by simple installation, can be more easily walked during walking, can be prevented from peeling off wood chips, and can further improve durability. In addition, it is extremely safe because it has a surface layer made of rubber chips and the wood chips are not exposed on the surface.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical view schematically showing an internal structure of an elastic mat for paving according to the present invention, and FIG. 2 schematically shows an internal structure of an elastic mat for paving according to another aspect of the present invention. It is a vertical view. In the figure, reference numerals (1) to (4) denote a paving elastic mat, a core material layer, a surface layer, and an underlayer, respectively. In the following description, the paving elastic mat is abbreviated as “mat”.

  The mat (1) of the present invention is a plate-like mat that is laid to finish pavement on outdoor walkable places such as park walkways, promenades, jogging courses, and amusement facilities. As shown, a core material layer (2) in which a large number of wood chips are bonded together with a resin adhesive and a surface layer (3) in which a large number of rubber chips are bonded together with a resin adhesive are provided. ing. That is, the mat (1) has a two-layer structure of a core material layer (2) made of wood chips and a surface layer (3) made of rubber chips.

  The planar shape of the mat (1) is not particularly limited, but is formed into a square of about 30 cm × 30 cm, for example. The thickness of the mat (1) is designed to be about 10 to 75 mm from the viewpoint of elasticity, durability, and moldability, and the average thickness of the core material layer (2) is 30 of the thickness of the entire mat. The average thickness of the surface layer (3) is about 6% to about 50% of the total thickness of the mat.

  In the present invention, a chip having a moisture content of 5 to 40% by weight is used as the wood chip constituting the core material layer (2) in order to increase the adhesive strength. The reason for specifying the moisture content of wood chips is as follows. That is, when the water content is more than 40% by weight, the adhesive strength of the resin adhesive is insufficient, the peel strength of the wood chip when formed into the core material layer (2) is low, and the core material layer (2) Cracks easily occur. On the other hand, it is desirable that the water content is low, but in order to make the water content less than 5%, it is necessary to force-dry the wood chips before mat formation, which is not practical because the processing cost increases. As the wood chip that satisfies the above-described conditions, wood generated as waste material by demolishing or renovating a building, that is, waste wood chip obtained by pulverizing so-called building waste material is preferable.

  The shape of the above-mentioned wood chip is not particularly limited, but the size of the wood chip is usually set such that when it is sorted by a sieve mesh, a φ10 mm sieve mesh passes but a φ1 mm sieve mesh does not pass. The wood chip having such a size is formed into, for example, a substantially rod shape by pulverizing wood with a pulverizer. The reason why the size of the wood chip is defined as described above is to set the porosity of the mat (1) in a range as described later.

  Furthermore, the wood chip may be impregnated with a preservative such as Tanaris CY or Mokubo AAC. In order to impregnate the preservative, for example, the pressure is applied while the wood chips are immersed in the preservative solution, or the wood chips are placed under a reduced pressure condition to supply the preservative solution. When the wood chip is impregnated with the preservative as described above, the decay of the mat (1) can be further reduced and the durability can be further improved.

  The resin adhesive that bonds the wood chips of the core material layer (2) includes polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate. , Fluororesins, thermoplastic acrylic resins, thermoplastic polyesters, thermoplastic polyamides, thermoplastic urethane resins, acrylonitrile-butadiene copolymers, styrene-butadiene copolymers, acrylonitrile-butadiene-styrene copolymers, etc. , Urethane resin, melamine resin, thermosetting acrylic resin, urea resin, phenol resin, epoxy resin, thermosetting polyester and other curable synthetic resins, urethane resin prepolymer, epoxy resin prepolymer, melamine resin prepolymer, urea resin Pre Rimmer, phenolic resin prepolymer, diallyl phthalate prepolymer, acrylic oligomer, polyisocyanate, methacrylic ester monomers, prepolymers such as diallyl phthalate monomer, an oligomer, a synthetic resin precursor monomers. From the viewpoint of adhesive strength, weather resistance, etc., a urethane resin is usually used.

  The use ratio of the resin adhesive is 5 to 30 parts by weight with respect to 100 parts by weight of the wood chip of the core material layer (2). The reason for setting the use ratio of the resin adhesive to the above range is as follows. That is, when the ratio of the resin adhesive is smaller than 5 parts by weight, the bonding strength between the wood chips (2) is insufficient, so that particularly the peel strength of the wood chips (2) is reduced or the core layer (2 ) Is likely to crack. Moreover, when the ratio of a resin adhesive is larger than 30 weight part, when manufacturing, the amount of resin at the time of mixing is large, and uniform filling with respect to a metal mold | die becomes difficult.

  The rubber chip constituting the surface layer (3) is formed by adding fillers such as carbon, calcium carbonate, and clay to natural rubber, synthetic rubber or a mixture of these in addition to chips obtained by pulverizing waste tires. Chips obtained by pulverizing vulcanized rubber may also be used. The constituent material of the rubber chip is not particularly limited. Specifically, natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber, ethylene-propylene rubber, ethylene-propylene- Examples include diene rubber, butyl rubber, halogenated butyl rubber, acrylic rubber, ethylene-acrylic rubber, polysulfide rubber, epichlorohydrin rubber, nitrile rubber-vinyl chloride resin blend, and nitrile rubber / EPDM blend.

  For rubber chips, if necessary, conventionally known additives used in general rubber products such as anti-aging agents, other fillers, reinforcing fillers, processing aids, vulcanizing agents, additives A sulfur accelerator or the like may be blended. Further, the rubber chip may be colored in each color by adding a pigment. By constituting the surface layer (2) with colored rubber chips, the design of the mat (1) can be enhanced and the mat (1) can be adapted to the landscape.

  The shape of the rubber chip is not particularly limited, but the particle size of the rubber chip is usually 0.5 to 5 mm, preferably 1 to 3 mm in consideration of the elastic force in the mat (1). The reason why the particle size of the rubber chip is set in the above range is as follows. That is, when the particle size of the rubber chip is larger than 5 mm, the unevenness of the surface of the mat (1) becomes large, the catch is large, and it becomes difficult to walk. On the other hand, when the particle size of the rubber chip (3) is less than 0.5 mm, the voids in the surface layer (3) become too small, resulting in poor water permeability. In the present invention, the rubber chip (3) having a particle size of 0.5 to 5 mm is a size that passes through a mesh of about φ5 mm but does not pass through a mesh of about φ0.5 mm when sorted by a sieve mesh. Say rubber particles.

  As the resin adhesive for bonding the rubber chip of the surface layer (3), the same adhesive as described above for the core material layer (2) can be used. Usually, from the viewpoint of adhesive strength, weather resistance, etc. Therefore, urethane resin is used. And for the same reason as in the core material layer (2), the usage ratio of the resin adhesive in the surface layer (3) is 5 to 30 parts by weight with respect to 100 parts by weight of the rubber chip of the surface layer (3).

  Further, in the mat (1) of the present invention, in order to prevent water from staying on the surface when exposed to rainwater, the internal porosity, that is, in the core layer (2) and the surface layer (3) The porosity is set to 40% or less, preferably 5 to 20%. In other words, the mat (1) has a very small size when the core layer (2) and the surface layer (3) are formed by irregular bonding of irregular shaped wood chips and rubber chips having a size within the above range. It has a structure in which a void is formed inside. The reason for setting the porosity in the above range is as follows. That is, when the porosity is less than 5%, the water tank is bad when exposed to rainwater and is not suitable for rainy weather or walking immediately thereafter. In addition, sufficient water permeability cannot be exhibited, and the wood chips tend to decay due to the rainwater staying inside. On the other hand, when the porosity is larger than 20%, the bonding force of the wood chip or the rubber chip by the resin adhesive is lowered, and the load resistance performance is lacking, and there is a possibility of causing cracking.

  The porosity in the core material layer (2) and the surface layer (3) can be adjusted mainly by the size of the wood chip and rubber chip to be used, the amount of resin adhesive used, and the pressure applied during molding, which will be described later. I can do it. In addition, each porosity in a core material layer (2) and surface layer (3) means the ratio of the volume of the space | gap part which occupies for the volume of these layers, and can be represented with the following formula | equation.

  In the mat (1) of the present invention, the core layer (2) and the surface layer (3) as described above are integrated with a resin adhesive when these layers are formed. That is, the mat (1) of the present invention is prepared by first mixing the rubber chip constituting the surface layer (3) and the adhesive resin at a predetermined ratio, filling the gel-like mixture into an inlay mold, and Then, the wood chip constituting the core material layer (2) and the adhesive resin are mixed in a predetermined ratio, and the gel-like mixture is mixed with the previously filled rubber chip and the adhesive resin. It is manufactured by filling an inlay mold from above the mixture, leveling the surface flat, and then heat-pressing with a press device.

  In the batch manufacturing method described above, a mat (1) that can be applied as it is can be produced by using a mold having vertical and horizontal dimensions, and a large mold can be used to create a flat surface. A mat (1) having a construction size can also be produced by producing a large-sized mat having a square shape and cutting it into a predetermined size.

  As described above, the mat (1) of the present invention is preliminarily formed into a plate shape, so that it has excellent handleability, and is arranged on a roadbed on which mortar is placed, or a roadbed grounded with sand or the like. It is possible to lay very easily by arranging and laying. Moreover, since the laminated structure of the core layer (2) made of wood chips and the surface layer (3) made of rubber chips exhibits elasticity suitable for walking, it can reduce the load on the body and can walk comfortably. . Furthermore, since the core layer (2) and the surface layer (3) having a specific porosity exhibit water permeability to rainwater, the water tank is good and can walk safely without slipping even in rainy weather. . Moreover, since the surface layer (3) which consists of a rubber chip is provided and the surface of the wood chip is not exposed on the surface, it is extremely safe.

  Furthermore, in the mat (1) of the present invention, the core material layer (2) is composed of wood chips having a specific moisture content, and the wood chips of the core material layer (2) are more bonded to the resin adhesive. In addition, the core layer (2) and the surface layer (3) having a specific porosity exhibit water permeability to rainwater, and the surface layer (3) made of rubber chips is the core layer (3). Fix the wood chip on the surface. As a result, there is no peeling or dropping of the wood chips in the core material layer (2), the decay of the wood chips due to rain water is reduced, and there is no breakage such as cracks, so that even better durability can be exhibited. . And the mat | matte (1) of this invention can reduce cost by constituting a core material layer (3) with a waste wood chip, and can contribute to recycling of waste wood.

  Further, the mat (1) of the present invention can be configured in a three-layer structure as shown in FIG. 2 in addition to the two-layer structure as described above. The mat (1) of the present invention shown in FIG. 2 includes a base layer (4) formed by bonding a number of rubber chips to each other with a resin adhesive in addition to the core layer (2) and the surface layer (3). I have. That is, the mat (1) has a three-layer structure of a core material layer (2) made of wood chips, a surface layer (3) made of rubber chips, and an underlayer (4).

  The average thickness of the underlayer (4) is about 6 to 50% of the thickness of the entire mat. The rubber chip constituting the ground layer (4) is the same as the rubber chip of the surface layer (3) described above. Further, as the resin adhesive for bonding the rubber chip of the underlayer (4), the same adhesive as in the core material layer (2) and the surface layer (3) is used, and for the same reason as described above, The use ratio of the resin adhesive in the base layer (4) is 5 to 30 parts by weight with respect to 100 parts by weight of the rubber chip of the base layer (4).

  Further, in order to prevent rainwater from staying in the core material layer (2), the porosity of the underlayer (4) is 40% or less, preferably the same as the core material layer (2) and the surface layer (3). Set to 5-20%. By setting the porosity in the above range, it is possible to increase load resistance and water permeability, and to reduce the decay of the wood chips of the core material layer (2). In addition, the meaning of the porosity is the same as that in the core material layer (2) and the surface layer (3).

  In the mat (1) of the present invention shown in FIG. 2, the core material layer (2), the surface layer (3) and the base layer (4) are formed when these layers are formed, as in the mat of FIG. Integrated with resin adhesive. That is, in the mat (1), the gel-like mixture constituting the surface layer (3) and the gel-like mixture constituting the core material layer (2) are put into an inlay mold in the same manner as the production of the mat shown in FIG. After sequentially filling, the inner die is filled with a mixture of a rubber chip and an adhesive resin constituting the base layer (4) similar to the surface layer (3), and the surface is leveled, and then heated by a press device. Manufactured by pressure molding. The mat (1) shown in FIG. 2 is different from the mat shown in FIG. 1 in that the gel material is stacked in three layers.

  Since the mat (1) of the present invention shown in FIG. 2 is formed into a plate shape in the same manner as the mat shown in FIG. 1, it is excellent in handleability and can be laid very easily. In addition, the laminated structure comprising the core material layer (2), the surface layer (3), and the base layer (4) can reduce the load on the body, can walk comfortably, and has a specific porosity. Since the layer (2), the surface layer (3) and the foundation layer (4) exhibit water permeability to rainwater, the water tank is good and can walk safely without slipping even in rainy weather.

  Furthermore, in the mat (1) of the present invention, as in the mat shown in FIG. 1, the wood chip of the core material layer (2) exhibits a high bonding force with the resin adhesive, and has a specific porosity. The material layer (2), the surface layer (3) and the underlayer (4) exhibit water permeability to rainwater, and the surface layer (3) and the underlayer (4) made of rubber chips are the surface of the core layer (3). And fix the wood chip on the back. As a result, there is no peeling or dropping of the wood chips in the core material layer (2), the decay of the wood chips due to rain water is reduced, and there is no breakage such as cracks, so that even better durability can be exhibited. . Further, since the core material layer (2) is sandwiched between the surface layer (3) and the base layer (4) of the rubber chip, even when the core material layer (2) absorbs water, the warp of the surface is effective. Can be prevented.

  Two types of mats (1) having a three-layer structure as shown in FIG. 2 having a thickness of 25 mm, a porosity of 30%, and 0% were produced. Further, as a comparative example, two types of mats having a single layer structure made only of wood chips having a thickness of 25 mm, a porosity of 30%, and 0% were manufactured. And when the difference in strength, water permeability, etc. due to the difference in porosity was confirmed, the results shown in the following table were obtained. In both examples and comparative examples, the amount of the resin adhesive was 20% by weight with respect to the entire mat.

  In addition, with regard to the shock absorption performance of the mat (1), an impact drop test was performed in which a steel ball having a weight of 3.75 kg was dropped from a height of 20 cm onto a mat laid on sand and the maximum acceleration applied to the steel ball at the time of collision was measured. As a result, the results shown in the following table were obtained.

It is a longitudinal view which shows typically the internal structure of the elastic mat for paving which concerns on this invention. It is a longitudinal view which shows typically the internal structure of the elastic mat | matte for pavement which concerns on the other aspect of this invention.

Explanation of symbols

1: Elastic mat for pavement 2: Core material layer 3: Surface layer 4: Underlayer

Claims (3)

  A plate-like elastic mat for pavement that is laid for pavement finishing, a core material layer in which a number of wood chips are bonded to each other with a resin adhesive, and a number of rubber chips with a resin adhesive The wood chip constituting the core material layer has a water content of 5 to 40% by weight, and the porosity of the core material layer and the surface layer is 40% or less. Elastic mat for pavement characterized by.   The elastic mat for pavement according to claim 1, further comprising a base layer in which a large number of rubber chips are bonded to each other with a resin adhesive, and the porosity of the base layer is 40% or less.   The elastic mat for pavement according to claim 1 or 2, wherein the wood chip of the core material layer is a waste wood chip obtained by pulverizing a building waste material.

Images