JP2002137211A - Lumber for wooden structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide lumber for a wooden structure which is suitable as a material of the wooden structure since decrease of durability following deterioration and corrosion damage can be prevented. SOLUTION: A log 7 as lumber for a wooden structure is used as materials for the wooden structure (for example, a debris barrier partly constituted by the lumber) which is at least partly composed of lumber and built out in the fields. The log 7 comprises a barked lumber from thinning 8, as insect proof layer 12, a foundation layer 12 and a protective layer 13. The insect proof layer 11 is formed by applying a wood preservative to a surface of the lumber from thinning 8. The protective layer 13 is formed by applying a polyester resin as a thermosetting resin to the foundation layer 12 to be hardened. The foundation layer 12 is provided for preventing permeation of the applied liquid polyester resin into the lumber from thinning in forming the protective layer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to materials for wooden structures at least partially made of wood and constructed outdoors, such as civil engineering structures such as sabo dams and wooden playground equipment installed in parks. The present invention relates to wood for a wooden structure used as a material.

[0002]

2. Description of the Related Art Conventionally, civil engineering structures such as sabo dams for preventing earth and sand disasters by controlling the movement of earth and sand in mountain streams are often made of concrete from the viewpoint of durability and economy. On the other hand, in recent years, civil engineering structures constructed in places where high durability is not required and small civil engineering structures have been converted to concrete from the viewpoint of considering the landscape and expanding demand for domestic timber. Instead, thinning materials such as cedar tend to be actively used.

[0003]

However, as described above, when a civil engineering structure such as a sabo dam is constructed by using a thinned lumber, the thinned lumber is organic unlike a civil engineering structure made of concrete. Bacteria such as wood rot fungi may invade the tissue of the thinned wood, degrade the cell walls, and reduce the strength or change the form of the thinned wood, so-called decay may occur. In addition, the thinning material is brown with the decay,
There are also problems of discoloration to white and the like, and problems of feeding damage by pests such as perforating insects. Then, such decay and corrosion damage lower the durability of the civil engineering structure and discolor the landscape. This problem occurs not only in the above-described civil structure but also in a wooden structure constructed outdoors, for example, a wooden playground equipment installed in a park.

Accordingly, an object of the present invention is to provide wood for a wooden structure, which can prevent deterioration of durability due to decay and corrosion and is suitable as a material for the wooden structure. In addition, another object of the present invention is to provide wood for a wooden structure, which can prevent landscape deterioration due to discoloration due to decay when used in a wooden structure, in addition to the above-mentioned problems.

[0005]

Means for Solving the Problems The invention according to claim 1 is wood for a wooden structure which is at least partially made of wood and is used as a material of a wooden structure constructed outdoors. And a hard protective layer made of synthetic resin and provided around the thinned material.

Accordingly, since the protective layer made of a synthetic resin and covering the thinned wood has a high hardness, it prevents wood rot fungi, which cause decay, from invading the tissue of the thinned wood, and prevents the cell wall from being damaged. Prevents components from being degraded. In general,
Wood may exhibit brown color, white color, or the like due to decay, but the aforementioned discoloration is eliminated due to the inhibition of cell wall decomposition described above. The protective layer also prevents pests, such as insects, from eating the thinned wood and preventing holes from being drilled.

According to a second aspect of the present invention, in the first aspect of the invention, a wood insect repellent is applied to a surface of the thinned wood, and the protective layer is provided outside the wood insect repellent. Here, as the wood insect repellent, for example, a boron compound is used.

[0008] Accordingly, the wood insect repellent applied to the surface of the thinned wood protects the thinned wood from the damage of the insects. For example, if the wood insect repellent has a relatively high insecticidal power,
In this way, insects that have touched the treated thinned wood or consumed the thinned wood are killed. In addition, in the case of a wood insect repellent having a low insecticidal power, an effect (repellent effect) of preventing insects from hindering smell and taste from approaching thinned wood or an effect of preventing spawning (eg, spawning). (Repellent effect).

The invention described in claim 3 is the first or second invention.
In the invention described in (1), the protective layer is formed by applying a thermosetting resin and curing by heating.

Therefore, a protective layer formed by applying a thermosetting resin and curing by heating generally has a three-dimensional network structure and high hardness. For this reason, the invasion of the aforementioned wood rot fungi and pests is reliably prevented.

[0011] According to a fourth aspect of the present invention, in the third aspect of the invention, between the thinned material and the protective layer,
A base layer is provided for preventing the applied thermosetting resin from penetrating into the thinned material. The underlayer is
For example, it is formed by a urethane surfacer.

Therefore, even if the thermosetting resin applied to the thinned material tries to penetrate into the tissue of the thinned material before it is completely cured, the penetration is prevented by the underlayer.

The invention described in claim 5 is the first or second invention.
In the invention described in (1), the protective layer is made of a thermoplastic resin, and is formed by heat-shrinking a tubular member covered with the thinned material. Here, for example, a vinyl chloride resin is used as the thermoplastic resin.

Therefore, when a protective layer is provided around the thinned material, a tubular member made of a thermoplastic resin is put on the thinned material and heated. Then, the cylindrical member softens and melts and shrinks and comes into close contact with the thinned wood. When the thermoplastic resin cures, a protective layer is formed around the thinned material. This protective layer has a high hardness and reliably prevents the above-mentioned wood rot fungi and pests from entering.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In general, there is a dam construction as one mode of horizontal construction constructed across a valley floor, and when the dam construction is carried out, a civil engineering structure such as a dam, a mountain dam, a sabo dam and the like is constructed. Sabo dams are a type of sand storage dam installed to control sediment movement in mountain streams to prevent sediment disasters. In the present embodiment, a part of the sabo dam is made of wood, so that the sabo dam is an object of the wooden structure.

As shown in FIG. 1, the sabo dam 1 is roughly divided into an impermeable core portion 2 made of clayey soil, a semi-permeable filter portion 3 provided outside the core portion, and a further And a water-permeable surface layer 4 provided on the outside. The filter unit 3 is made of a cobble stone, a split stone, or the like, and includes a stone block 6 surrounding the core unit 2 and a stone block 5 surrounding the stone block 6. As the rubble stone 5 and the stone mass 6, those generated on site, such as runoff soil, excavated soil, and dredged soil upstream of the sabo dam 1 can be used.

The surface layer 4 is composed of a number of logs 7 as wood for a wooden structure. The main part of the log 7 is made of thinned wood. Thinned wood generally refers to trees that are cut down to provide sufficient sunlight and space to the remaining trees when the trees become crowded as the trees grow, such as cedar, pine, and cypress. However, instead of using the thinned wood as it is as the log 7, a thinned wood that has been subjected to the following surface treatment is used as the log 7. The thinning material to be subjected to the surface treatment may be raw wood (bark not peeled off) or may be bark peeled off from the raw wood, but the latter is used here. ing. Further, in the present embodiment, thinned materials having a similar thickness to some extent are used, and are trimmed to have a predetermined length.

As shown in FIG. 4, around the thinned wood 8 from which the bark has been peeled off, an insect repellent layer 11, an underlayer 12 and a protective layer 1 are provided.
3 are formed in order. The insect repellent layer 11 is formed by applying a wood insect repellent to the surface of the thinned wood 8. A wood insect repellent is a compound (drug) used to protect wood (here, thinned wood 8) from the damage of its insects. As the wood insect repellent, for example, boron compounds such as sodium octaborate tetrahydrate, boric acid, and sodium borate can be used. Boron compounds are known as wood insect repellents for dry food pests with high food toxicity. Food poisoning is a property in which a drug that has entered the digestive tract from the chewy mouth of a pest-causing insect causes toxic symptoms and is lethal.

The underlayer 12 smoothes the surface of the thinning material 8 which is the surface to be coated before the thermosetting resin described later is applied, and allows the thermosetting resin to penetrate the thinning material 8. It is for preventing and improving the finish. The base layer 12 is formed by thinning a paint called a surfacer (base coat) with a thinner or the like, and then diluting the paint several times.
1 is formed. here,
Urethane surfacers are used.

The protective layer 13 is formed of a thermosetting resin. Examples of the thermosetting resin include an alkyd resin, a polyester resin, an unsaturated polyester resin, a polyurethane resin, an acrylic resin, an epoxy resin, a melamine resin, a urea resin, a phenol resin, and the like.Here, the polyester resin is used. ing.

The protective layer 13 is formed by applying a polyester resin to the underlayer 12 and thermally curing it.
The application method is roughly classified into a method of atomizing a liquid polyester resin (atomization application) and a method of not atomizing the liquid polyester resin. As the former method, an air spray method in which a liquid and an air stream collide with each other to form fine droplets (atomize) and apply, or a method in which high pressure is directly applied to a liquid polyester resin and jetted at a high speed from a nozzle. A typical example is an airless spray method in which the particles are atomized. As the latter method of not atomizing, a method of immersing the thinned material 8 in a liquid polyester resin or a method of applying the polyester resin by flowing the thinned material 8 or using a carrier such as a brush, a roller brush, a tampo, etc. A typical method is to apply a polyester resin.

Here, even if the polyester resin applied to the thinned material 8 tries to penetrate into the tissue of the thinned material 8 before it is completely cured, the permeation is prevented by the base layer 12. Therefore, there is no possibility that the thinned wood 8 is adversely affected by the penetration of the thermosetting resin. Further, the surface of the protective layer 13 becomes smooth due to the presence of the underlayer 12.

As described above, the insect repellent layer 11 and the underlayer 1
The thinned wood 8 covered with the protective layer 2 and the protective layer 13 is used as the log 7. Then, as shown in FIGS.
Multiple logs 7, reinforced sheet 15, frame fence 16, pile 2
1, one unit structure 14 by the water permeable sheet 23 and the like
The surface portion 4 of the sabo dam 1 and a part of the filter portion 3 are formed by stacking these over several levels.

Here, the unit structure 14 will be described. The reinforcing sheet 15 is formed of, for example, a thick nonwoven fabric having high strength. The frame fence 16 extends in a substantially horizontal direction and has a bottom portion 17 placed on the reinforcing sheet 15.
And a front wall portion 18 extending obliquely rearward and upward from the front end (the left end in FIG. 2) of the bottom portion 17. Frame fence 16
Is manufactured by, for example, arranging linear reinforcing bars in the longitudinal direction and the lateral direction, welding them to each other, and bending the central portion. Alternatively, the frame fence 16 arranges a plurality of vertical reinforcing bars bent in a U-shape in a horizontal direction and arranges a plurality of straight reinforcing bars so as to cross the vertical reinforcing bars. They are arranged, and these vertical reinforcing bars and horizontal reinforcing bars are welded to each other.

The front wall portion 18 and the bottom portion 17 are connected by connecting members such as a connecting rod 19 with a hook and a turnbuckle (not shown). This is to increase the strength of the front wall portion 18 and reliably prevent the front wall portion 18 from bending forward even when a relatively large force is applied by the load of the chestnut stone 5 or the like. The frame fence 16 is reinforced by stakes 21 struck through the lattice portion of the bottom 17 thereof, with the reinforcing sheet 15 and the ground 22
And so on. Instead of this pile 21, the bottom 17
May be tied to the reinforcing sheet 15 by a wire or the like and stopped. The plurality of logs 7 are laid horizontally on the front side of the frame fence 16 and are arranged along the inclination of the front wall portion 18 while being in contact with each other, and are connected to the front wall portion 18 by an iron wire (not shown) or the like. I have.

The water permeable sheet 23 is formed of a water permeable material such as a nonwoven fabric, for example, and is arranged on the rear side of the frame fence 16 and along the front wall portion 18. Permeable sheet 2
The upper and lower ends of 3 are bent rearward. The space behind the water-permeable sheet 23 is filled with the stones 5 and the stone blocks 6 as the filling material to form the filter portion 3 and the bottom portion 17.
And the connecting rod 19 are buried in the chestnut stone 5 or the like.

In the above-described sabo dam 1, the surface layer portion 4 is not made of concrete but is constituted by a log 7 mainly composed of a natural thinning material 8. For this reason, the sense of incongruity with the surroundings (artificial appearance) caused by the texture unique to concrete is eliminated. The sabo dam 1 is in harmony with the environment such as the surrounding forests and does not impair the natural landscape (aesthetics). The thinning material 8 generated by cutting a part of the tree is used for the log 7 for the purpose of assisting the growth of the forest tree in the mountain forest, so that the thinning material that has been of little value in the past can be effectively used. By expanding the use of thinned wood, forest resources can be used effectively and the local industry (forestry) can be activated.

In each log 7, the protective layer 13 provided around the thinned wood 8 is formed of a polyester resin which is a kind of thermosetting resin. This protective layer 13 has a three-dimensional network structure and has high hardness.
Further, the protective layer 13 does not soften and melt even when heated, and once cured, does not dissolve in the solvent. The thinning material 8 is protected by the protective layer 13 having such properties. Therefore, the strength of the log 7 is increased by the protective layer 13. This is useful for the sabo dam 1 to exhibit a function of storing and adjusting a large amount of sediment and sand, and a function of retaining and reducing the scale of debris flow.

The hard protective layer 13 described above prevents bacteria such as wood rot fungi from invading the tissue of the thinned wood 8 and decomposing cellulose, hemicellulose, lignin and the like, which are components of the wood cell wall. It prevents the phenomenon of so-called decay, which is a phenomenon in which the strength of the wood is significantly reduced or its form is changed. The wood may be discolored to brown, white, etc. due to the decay, but since the cell walls are not decomposed as described above, there is no fear of the discoloration. As described above, the protection layer 13 made of the thermosetting resin improves the resistance (decay resistance) of the thinned wood 8 against attack by wood rot fungi and the like.

The protective layer 13 prevents invasion of pests such as piercing insects, so that it can prevent so-called insect damage by the pests. In addition, since there is no trace of food damage caused by the perforating insects or the escape hole of the adult, the problem of discoloration bacteria or wood rot fungi invading therefrom, that is, the above-mentioned problem of decay and discoloration does not occur. As described above, the protective layer 13 made of the thermosetting resin improves the pest control function. In addition, the insect repellent layer 11, the base layer 12, and the protective layer 1
By making 3 nearly transparent or translucent, it is possible to prevent the landscape of the sabo dam 1 from deteriorating due to discoloration accompanying decay.

Further, the wood insect repellent applied to the surface of the thinned wood 8 also protects the thinned wood 8 from damage by the insects. For example, if the wood insect repellent has a relatively high insecticidal activity, it may touch the thinned wood 8 treated with this,
Insects that have consumed the thinned wood 8 are killed. In addition, in the case of a wood insect repellent having a low insecticidal power, it exerts an effect of repelling insect pests so that they do not approach smell and taste, etc. .
Then, the sabo dam 1 constructed by using the logs 7 having improved decay resistance and control properties described above on the surface thereof maintains the initial strength well.

In particular, the polyester resin which is a component of the protective layer 13 has little shrinkage due to curing when forming the protective layer, in addition to the general properties of the thermosetting resin. In addition, the formed protective layer 13 exhibits high mechanical strength in a wide temperature range, and exhibits excellent wear resistance, adhesiveness, heat resistance, dimensional stability, water resistance, chemical resistance, and the like. Therefore, it is considered to be particularly effective for maintaining strength.

In addition, the protective layer 13 made of a polyester resin has a feature that almost no off-flavor is emitted.
This is very different from applying a preservative to a log and letting it penetrate, in many cases, emitting a strong off-flavor.

The present invention can be embodied in another embodiment described below. (1) The protective layer 13 in the above embodiment may be formed of a thermoplastic resin. As the thermoplastic resin, for example, acrylic resin, polystyrene, polypropylene, polyethylene, vinyl chloride resin and the like are used. FIG.
(A) and (b) show an example. Here, the protective layer 1
As the third material, a cylindrical member 25 made of vinyl chloride resin is used. The cylindrical member 25 has an inner diameter slightly larger than the diameter of the thinned material 8. When the protective layer 13 is formed, the tubular member 25 is covered with the thinned wood 8 having the insect-proof layer 11 on the surface, and is heated. Then, the cylindrical member 25
Is softened and melted and shrunk to adhere to the thinned wood 8. The protective layer 13 thus formed also has a high hardness.
Therefore, similarly to the above-described embodiment, invasion of wood rot fungi and pests is reliably prevented. In the case of this embodiment,
The underlayer 12 becomes unnecessary.

(2) The configuration of the unit structure 14 using the frame fence 16 may be changed. An example is shown in FIG. In the above embodiment, the logs 7 arranged along the slope of the front wall portion 18 are in contact with each other and there is almost no gap between them, but here, the logs 7 are arranged in a state of being separated from each other. And a gap is provided between them. The turf 26 is disposed between the front wall portion 18 of the frame fence 16 and the permeable sheet 23. In this way, the turf 26 can be seen between the adjacent logs 7, and the landscape of the sabo dam 1 is further improved.

(3) In the sabo dam 1, portions corresponding to the core portion 2 and the filter portion 3 may be made of concrete. In this case, for example, a bolt is planted on the wall surface of the concrete body, the bolt is passed through the hole of the log, and the log is fixed to the wall by tightening with a nut.

(4) The wooden structure to which the wood for a wooden structure of the present invention is applied may be any wooden structure at least partly made of wood and constructed outdoors.
In addition to the above-described embodiment, the following may be mentioned.

A type of sabo dam different from that of the above embodiment. The sabo dam 1 of the above embodiment is a non-transmissive dam that blocks the entire river channel and stores earth and sand. As another type, there is a permeation type sabo dam that connects continuously without sudden changes in the flow upstream and downstream of the dam during normal water. For example, a screen dam and a slit dam correspond to this.

Civil structures such as dam works other than the sabo dam 1 (for example, floor hard dams), valley stops, floor hard works, etc. Tokiko Dam is a dam that reduces the slope of the mountain stream, reduces the impact of flowing water, and prevents the progress of longitudinal erosion. The civil engineering structure used for the valley stop is a non-transmissive dam installed in a small valley with a relatively steep slope. The civil engineering structure used for the floor hardening is a structure that is constructed across the valley floor and has a relatively low height (2 m or less), similarly to the dam construction.

Civil works such as diversion works, seawall works, and dike works constructed to prevent erosion and collapse of the shore.

A civil engineering structure of a hillside foundation work for fixing a hillside collapse surface or a hillside to prevent outflow of soil and erosion valleys. For example, a civil engineering structure such as a method cutting method, an earth retaining work, a burial work, a waterway work, and the like are applicable. Among them, the canal work is a method implemented for the purpose of stabilizing the hillside slope, such as prevention of slope erosion due to rainfall or spring water, prevention of soil strength reduction due to seepage water, and prevention of increase in pore water pressure.

Civil engineering structures for mountainside greening. For hillside revegetation, for example, fences are installed on hillside slopes and stairs to prevent runoff of topsoil, and buried on the back of the fence to implement planting trees and favorable environmental conditions. There is a fencer. In the wooden fence construction, which is one of the above-described methods, a log similar to the above embodiment can be used as a wall material.

Wooden facilities, playground equipment, game machines, etc. in parks and the like.

(5) The insect repellent layer 11 in the above embodiment may be omitted, the underlayer 12 may be omitted, or both layers 11 and 12 may be omitted. Similarly, it is possible to omit the insect repellent layer 11 in the above (1).

[0045]

According to the first aspect of the present invention, it is possible to prevent a decrease in the durability of wood for a wooden structure due to decay and damage, and it is suitable as a material for a wooden structure. In addition, by forming the protective layer with a transparent or translucent synthetic resin, when used for a wooden structure, it is possible to prevent the landscape from being deteriorated due to discoloration due to decay.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the wood insect repellent applied to the surface of the thinned wood can more reliably prevent deterioration in durability due to decay and damage from damage.

According to the third and fifth aspects of the invention, the effects of the first or second aspect of the invention can be reliably achieved.

According to the invention set forth in claim 4, according to claim 3,
In addition to the effects of the invention described in (1), it is possible to prevent the thinned material from being adversely affected by the penetration of the applied thermosetting resin.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a sabo dam according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partial perspective view showing a relationship between a frame fence, a reinforcing sheet, a water-permeable sheet, and the like.

FIG. 4 is a partially enlarged sectional view of a log.

5A and 5B are diagrams showing another embodiment of a log, in which FIG. 5A is a partial perspective view showing a state before a tubular member is put on a thinned material, and FIG. 5B is a partially enlarged sectional view of the log. is there.

FIG. 6 is a partial sectional view showing another embodiment of the sabo dam.

[Description of Signs] 1 Sabo dam as a wooden structure 7 Log as wood for a wooden structure 8 Thinning material 11 Insect repellent layer 12 Underlayer 13 Protective layer 25 Cylindrical member

Claims (5)

[Claims] 1. A wood for a wooden structure which is at least partially made of wood and is used as a material of a wooden structure constructed outdoors, comprising a thinning material, a synthetic resin, and the thinning material. A wood for a wooden structure, comprising: a hard protective layer provided around the periphery. 2. The wood for a wooden structure according to claim 1, wherein a wood insect repellent is applied to a surface of the thinned wood, and the protective layer is provided outside the wood insect repellent. 3. The wood for a wooden structure according to claim 1, wherein the protective layer is formed by applying a thermosetting resin and curing by heating. 4. An underlayer for preventing the applied thermosetting resin from penetrating into the thinned material is provided between the thinned material and the protective layer. The wood for a wooden structure according to claim 3, which is used. 5. The protective layer is made of a thermoplastic resin,
3. The wood for a wooden structure according to 1 or 2, wherein the wood is formed by heating and shrinking the tubular member covered with the thinned wood.