JPH10252007A - Woody pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woody pavement near a natural road surface in nature and not applying unnatural reaction to a human body at the time of a walk by using a woody layer connected with chips of bark by a binder as a surface layer. SOLUTION: A woody layer connected with chips of bark by a binder is used as the surface layer of this woody pavement, and it is formed on the graded ground or an a roadbed formed on the graded ground. The bark of needle-leaved trees and board-leaved trees can be used for this bark, and the size of the chips is preferably set to the width of about 1-10mm and the length of about 5-150mm. The bark of the needle-leaved trees such as a Japanese cedar, a Japanese cypress, and a hiba arborvitae is preferably used in particular, independently or mixedly. A moisture hardening or pressure hardening powder asphalt binder is used for this binder. Sand is preferably mingled into the woody layer, and the mingled quantity of sand is preferably set to 6-15kg for the woody layer of 1m<2> (thickness of 30mm).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wooden pavement,
For details, promenades, parks, amusement parks, riverbeds, forests, fields, farmland, golf courses, stadiums, ballparks, sports facilities, parking lots, bicycle parking lots, horse racetracks, playground equipment, around planting areas, around buildings, The present invention relates to a wooden pavement formed on a walking surface or a road surface such as a roof, an atrium, a house, a terrace, and a bridge.

[0002]

2. Description of the Related Art As a conventional technique of wood pavement, there is a technique in which a wood layer in which granular chips obtained by pulverizing bark and heartwood are connected by a binder is used as a surface layer.

[0003] Since granular chips tend to be densely packed due to their shape, the woody layer tends to be hard, and has a shock absorbing property, elastic resilience, softness, etc. (hereinafter simply referred to as "physical properties").
Is significantly different from natural walking surfaces such as black soil and natural grass, natural road surfaces, and the like (hereinafter, simply referred to as “natural road surfaces”).

[0004]

According to the above prior art, physical properties are significantly different from those of a natural road surface, so that when walking or running, an unnatural reaction force is likely to be exerted on the body from the wooden pavement, and the tire is easily fatigued.

[0005] An object of the present invention is to provide a wooden pavement whose physical properties can be brought close to a natural road surface.

[0006]

Each of the inventions relates to a wooden pavement. The first invention is characterized in that a woody layer in which bark slices are connected with a binder is used as a surface layer. A second invention is characterized in that, in the first invention, sand is mixed in the woody layer. A third invention is characterized in that, in the first invention or the second invention, a bark of a conifer is used as a bark. A fourth invention is characterized in that, in the third invention, one or more species selected from cedar, cypress, and cypress are used as the conifer. A fifth invention is characterized in that in any one of the first to fourth inventions, an asphalt-based binder is used as a binder.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The woody pavement of the present invention has, as a surface layer, a woody layer obtained by connecting finely cut bark with a binder. This woody layer may be formed on the ground that has been leveled, or a roadbed may be formed on the ground that has been leveled, and may be formed on the ground.
The roadbed is made of crushed stone, gravel, sand, etc.

[0008] As the bark, coniferous or hardwood bark can be used. The size of the finely chopped pieces is 1-10 width.
mm and a length of about 5 to 150 mm are desirable. The reason is as follows. That is, if the width is less than 1 mm, or if the length is less than 5 mm, the filling state of the shredded material becomes too dense, the wood layer becomes hard,
The difference in physical properties from the natural road surface increases. On the other hand, if the width is 10
If the length exceeds 150 mm or the length exceeds 150 mm, irregularities are likely to occur on the surface of the wooden layer. On the other hand, in the above desirable range, such an adverse effect hardly occurs.

It is desirable that sand be mixed into the woody layer. The mixing amount of sand is desirably 6 kg to 15 kg per 1 m ² (thickness 30 mm) of the woody layer. When the mixing amount of the sand is less than 6 kg, the water permeability of the wooden layer may be insufficient. On the other hand, if it exceeds 15 kg, the woody layer becomes hard, and the difference in physical properties from the natural road surface increases. On the other hand, in the above desirable range, such an adverse effect hardly occurs. The reason why the wood layer is kept permeable by sand is considered to be as follows. That is, when the bark dries, the surface tends to be water repellent, and it may not be possible to obtain sufficient water permeability as it is.On the other hand, if the bark contains sand, even if the bark is water repellent, Is thought to be transmitted through the highly hydrophilic sand.

As the bark, any of coniferous bark and hardwood bark can be suitably used, but it is preferable to use coniferous bark. Hardwood bark has poor bast development and tends to become scaly when crushed, making it difficult to cut into finely chopped pieces, while coniferous bark has good bast development and is suitable for finely cut pieces. This is because it is easy to shape. Also, the bark of conifers is generally slower in decomposition by bacteria and wood rot fungi than the bark of hardwoods, so that the durability of the woody layer can be increased. As the bark of a conifer, any bark of cedar, cypress, cypress, etc. can be suitably used, but it is desirable to use any of the bark of cedar, cypress, cypress alone or in combination. This is because the bark of cedar, cypress, and cypress has a remarkably slow decomposition rate by bacteria and wood rot fungi, so that the durability of the woody layer can be further increased.

As the binder, a moisture-curable powder binder, an asphalt emulsion, a moisture-curable powder asphalt-based binder, a pressure-curable powder asphalt-based binder, an early-strength cement, a urethane polymer, a polyester resin and the like can be preferably used. It is desirable to use an asphalt binder. In binders other than asphalt-based binders, the adhesive strength and curing time may vary greatly depending on the water content of the bark, and it is difficult to handle them, whereas in asphalt-based binders, there is no such change, This is because the handling is easy.

[0012]

【Example】

(Example 1) A roadbed was formed on the ground which had been leveled, and a wooden pavement was constructed on the roadbed. The roadbed is a crushed stone layer and was formed as follows. That is, C40-0 crusher orchid is laid so as to be 100-150 mm in thickness,
It was formed by rolling using a 1-ton class vibration roller.

The wooden pavement was constructed as follows. In other words, the bark of cedar and the bark of cypress are treated with a shredding machine,
Fine cuts of each bark were obtained. The dimensions of the cut pieces of each bark are width 1
mm to 10 mm, length about 5 mm to 150 mm, water content 60%, specific gravity 0.2. Each bark was mixed with a binder, sand and water, and kneaded well for 5 minutes so that they became uniform. The amount is, the construction surface 1 m ² per fine cutlery a 50-liter, cedar bark, bark cypress fine cutlery 1
0 liter, moisture hardening type binder 8.4Kg, sand 12K
g and water 5 liters. The kneaded material was evenly spread on a crushed stone layer with a thickness of 60 mm using a reiki, and sufficiently rolled using a 1-ton class vibration roller to form a woody layer having a thickness of 30 mm. The wooden pavement thus obtained had a natural appearance based on the texture of the bark in appearance, the feeling when walking or running was close to the natural road surface, and the drainage was good.

(Example 2) A wooden pavement was obtained in the same manner as in Example 1 except that the binder was replaced with 10.2 kg of asphalt emulsion and that water was not used. The woody pavement had the same natural appearance as that of Example 1, the walking feeling was similar to a natural walking surface and the like, and the drainage was good. When an asphalt emulsion is used, in order to increase the strength, the woody layer should be allowed to stand under natural drying for 24 hours after construction.

(Example 3) A wood pavement was obtained in the same manner as in Example 1 except that the binder was changed to 7 kg of a moisture-curable asphalt binder. This woody pavement had the same natural appearance as that of Example 1 except that it became slightly blacker. The feeling when walking or running was close to the natural road surface, and the drainage was good.

Example 4 A wood pavement was obtained in the same manner as in Example 1 except that the binder was changed to 7 kg of a pressure-curing powder asphalt binder. This wooden pavement has a natural appearance similar to that of Example 1 except that the black color becomes slightly stronger, and the feeling when walking or running is close to the natural road surface,
The drainage was good.

(Comparative Example 1) A wood pavement was obtained in the same manner as in Example 1, except that the finely cut pieces of cedar and hinoki were changed to granular chips (particle diameter of 10 mm or less) of pine bark. This wood pavement has a significantly different feel when walking or running than on a natural road surface.

(Comparative Example 2) Asphalt pavement was compared with Comparative Example 2.
And Asphalt pavement has a completely different feeling when walking or running than a natural road surface.

Comparative Example 3 Example 1 except that sand was not used.
A wooden pavement was obtained in the same manner as described above. This wooden pavement had the same natural appearance as that of Example 1, and the feeling when walking or running was close to the natural road surface, and the drainage was poor.

(Reference 1 and Reference 2) A road surface of black soil is referred to as Reference 1, and a road surface on which natural grass is planted is referred to as Reference 2.

Test Example 1 Shock Absorbability Each of the kneaded materials prepared in Examples 1 to 4 and Comparative Examples 1 and 3 was laid in a wooden frame of 20 cm square to a thickness of 6 cm, and then spread to a thickness of 3 cm. The samples were compressed and allowed to stand at room temperature for 3 days to obtain test samples of Examples and Comparative Example 1. The asphalt pavement surface having a thickness of 30 mm was used as a specimen of Comparative Example 2. 30mm black soil
And the specimen of Reference Example 1 was obtained. 30 natural turf
The thickness of the test piece of Reference Example 2 was obtained. A golf ball was naturally dropped from a height of 100 cm on each specimen, and the height of the bound was measured. The results are shown in Table 1 as GB coefficients (shock absorbing properties).

<< Test Example 2 >> Elastic rebound A steel ball having a diameter of 1 inch was naturally dropped from a height of 100 cm onto each test piece prepared in Test Example 1, and the height of the bound was measured. The results are shown in Table 1 as SB coefficient (elastic rebound).

Test Example 3 Softness A 4.5 mm diameter proctor needle was protruded from each specimen prepared in Test Example 1 and the weight applied at the time of penetration was measured. The results are shown in Table 1 as the penetration weight. .

Test Example 4 Water Permeability The water permeability of each specimen prepared in Test Example 1 was measured according to JIS standard A.
It was measured by 1218-1990 (test method for soil permeability). The results are shown in Table 1 as the hydraulic conductivity.

[0025]

[Table 1]

(Evaluation of Test Examples 1 to 3) The results of Test Examples 1 to 3 are evaluated. As shown in Table 1, while the numerical values of Comparative Examples 1 and 2 were far away from References 1 and 2,
The values of ４4 are very close to the criteria 1.2. from this result,
In wood pavement and asphalt pavement using bark granular chips, the feeling when walking or running is significantly different from natural road surface, whereas in wood pavement using bark shreds,
The fact that it is close to a natural road surface was also supported numerically.

(Evaluation of Test Example 4) The results of Test Example 4 are evaluated. As shown in Table 1, Examples 1-4 were better than Comparative Example 3.
Becomes larger. From this result, it can be seen that mixing sand into the wooden pavement increases water permeability.

[0028]

【The invention's effect】

(First invention) The first invention uses a bark slice,
When the physical properties of the wooden pavement are close to the natural road surface and you walk or run, it is difficult for the natural reaction force to be applied to the body from the wooden pavement,
Less tired.

(Second Invention) The second invention has the following effects in addition to the effects of the first invention. Since sand is mixed in the woody layer, it has high permeability and rainwater easily penetrates underground. Therefore, the growth of the surrounding trees and the like are not hindered, and the natural environment is not spoiled.

(Third invention) The third invention has the following effects in addition to the effects of the first invention or the second invention. The bark of coniferous tree is used as the bark, but it has good bast development and can be easily cut into small pieces. In addition, the rate of decomposition by bacteria and wood rot fungi is slow, so that the durability of the wood layer is high.

(Fourth Invention) The fourth invention has the following effects in addition to the effects of the third invention. As conifers, cedar, cypress, and hiba are used. Since the bark of these bark has a remarkably low decomposition rate against bacteria and wood rot fungi, the durability of the wood layer is higher.

(Fifth Invention) The fifth invention has the following effect in addition to the effects of any of the first to fourth inventions. Since the asphalt-based binder is used as the binder, the adhesive strength and the hardening time do not greatly change depending on the water content of the cut bark, and the handling is easy.

Claims (5)

[Claims] 1. A wooden pavement, characterized in that a wooden layer in which bark fines are connected by a binder is used as a surface layer. 2. The wooden pavement according to claim 1,
A wooden pavement characterized by mixing sand with a wooden layer. 3. The wooden pavement according to claim 1, wherein a bark of a conifer is used as the bark. 4. The wooden pavement according to claim 3, wherein one or more conifers selected from cedar, cypress and cypress are used. 5. The wooden pavement according to claim 1, wherein an asphalt-based binder is used as a binder.