JP2000199229A - Frame for slope greening and slope-greening construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame for slope greening, by which soil required for growing tree saplings can be held stably and for which scrap wood such as timber from thinning can also be utilized, and a slope-greening construction method, by which the face of a slope can be changed into a forest efficiently by using the frame for slope greening. SOLUTION: In the frame for slope greening, a pair of retaining walls 3A, 3B composed of a plurality of wood 2, 2 are connected mutually at each one end section respectively. Both retaining wall sections 3A, 3B are formed by alternately superposing each wood 2, 2 of one retaining wall section 3A and each wood 2, 2 of the other retaining wall section 3B in the connecting section 4 of both retaining wall sections 3A, 3B, and installed onto the face of a slope 5 so as to mutually form specified angles at that time. In the slope-greening construction method, the inside of the frame 1 for slope greening is filled with borrow materials, and trees are planted into the frame 1 for slope greening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope revegetation frame and a slope revegetation method using the slope revegetation frame. A slope revegetation frame that can be stably maintained and can also use waste materials such as thinned wood, and a method that can use this slope revegetation frame to efficiently plant trees on slopes using trees It relates to the greening method.

[0002]

2. Description of the Related Art In the revegetation method of a slope, generally, seeds,
BACKGROUND ART A thick-layer spraying method of forming a thick organic soil on a slope by spraying a vegetation base material mixed with a fertilizer, a soil improving material, and the like has been performed. In this thick-layer spraying method, a net is laid in advance on the slope, and the vegetation base material is pumped by a spraying machine and sprayed on the slope through the net, and the rocky ground, hard soil, or poorly soiled land is laid. And the like, the stable thick organic soil can be formed uniformly. In recent years, the slope revegetation method requires slope revegetation technology for the purpose of planting trees with trees for reasons such as stability of the slope, improvement of the landscape, and conservation of the natural environment. In the spraying method, by adding seeds such as woody species to the vegetation base material in addition to herbs such as wild grasses, pastures, and flowers, it is possible to green the slopes with trees.

[0003]

However, woody seeds are susceptible to pressure from other seeds, and are particularly germinated and grown under pressure from foreign grass species with strong growth potential. I couldn't do much. In addition, the size and shape of seeds are limited to the types of wood that are suitable for the spraying method, the germination rate is not stable compared to grass, the germination and growth are greatly affected by the construction time, There was a problem that the seeds could not be obtained stably due to the results. In addition, when germinating and growing woody seeds in sprayed slope soil, it is difficult to grow them naturally in places with severe environmental conditions, and it is said that growth is uneven and aesthetics are impaired. There was a problem.

[0004] Therefore, especially when the slope of the slope is steep,
In the spraying method described above, it is difficult to fix the woody seeds, so a method of planting a seedling may be adopted. When planting seedlings, material and construction costs are higher than when seeds are sprayed.Therefore, instead of planting the entire slope uniformly, small-scale forests must first be grouped into slopes. There is a method that is installed inside the building and eventually leads to full forestation by natural transition.

[0005] When seedlings are planted on the slope, it is necessary to secure the soil necessary for growing the seedlings to be planted. As this method, a method of digging a planting hole on a slope and cultivating soil necessary for growth, or a method of providing a stepped step on a slope (Japanese Patent Laid-Open No.
-134918), a method of making a hole in a slope and inserting a plant (Japanese Patent Application Laid-Open No. 8-158372), installing a structure on a slope, filling the structure with soil, and planting a tree seedling. A method of planting (JP-A-8-27795) and the like have been developed.

[0006] When a structure is provided on a slope, use of natural wood such as wood or a wood-based natural material has been demanded for reasons such as consideration for the environment, ease of construction, and gentle landscape. As a structure on a slope using wood, a method of disposing a fence-shaped member formed by aligning a plurality of woods in a fence shape and facing each other, and filling the inside of the connected frame with earth and sand or the like is disclosed in No. 7-119166), and a method using wooden retaining fences arranged in parallel in a vertical shape and using a retaining fence fixed by a reinforcing bar material (Japanese Patent Application Laid-Open No. 8-113946) has been developed for the purpose of retaining a slope. .

[0007] As a structure intended for planting saplings such as trees, a reinforcing bar frame installed on a slope so as to surround a customer soil area of planting soil, and a reinforcing bar frame is inserted from above and held. And a plurality of pillars that are erected on the slope in a contact state with each other, and the reinforcing bar frames are located on the inner side and the outer side of the pillar group, respectively, and the pillars are Planting soil protection frame (JP-A-8-302699), comprising upper and lower reinforcing bar frames for regulating the posture, and anchor bars for fixing the reinforcing bar frame to the slope. It is composed of a plurality of metal guides erected on the side of the guest soil area of the soil, and a pillar that is horizontally stacked on the side of the guest soil area to form a retaining wall of the planting soil. And a through hole for inserting a guide body is formed in the column, and the guide is inserted through the through hole to form the column. There is a protection frame for planting soil (Japanese Patent Laid-Open No. 8-302700) configured to restrict the horizontal stacking posture, but the length of the wood and the cutting angle in accordance with the angle of the slope and the unevenness of the surface. In addition, since it is necessary to adjust the number of holes and to provide many through holes, the processing is complicated and difficult, and the workability is extremely poor. In addition, it is necessary to use wood having a certain thickness in order to provide the through holes, and it is necessary that the variation in the thickness within a single wood used and among a plurality of woods is small. For this reason, it was not possible to use waste materials such as thinned lumber generated by cutting a part of timber and core materials generated in the lumbering process.

[0008] As a method of using a natural material other than wood, there is a method in which a soil is disposed in contact with a greening material for earth retaining formed in the shape of a plate made of a decay material on a slope, and soil is removed on the slope. Method of planting a tree by raising a part of the tree
JP-A No. 0-183635) After fixing a retaining member, which is a combination of two panels in a V-shape, to each of the planting areas in a V-shaped state opened on the slope upstream side, the V of the retaining member is fixed.
There is a method of putting soil in the inside of a character shape and planting a tree in the soil (Japanese Patent Laid-Open No. 10-280418). However, in order to use a specially processed member,
Manufacturing costs are high, and a great deal of cost is required mainly for transporting materials to construction sites in mountainous areas. In each of these methods, the valley side of the structure that fills the soil is almost completely covered with the structure, so the structure grows from the bottom of the slope immediately after planting until the trees grow large enough to cover the structure. Things were noticeably exposed, which was not aesthetically pleasing. In addition, since it is a natural material, it eventually rots and does not remain as a structure. When it rots, it loses its function and strength as an earth retaining material. When heavy rainfall, snowfall, snowmelt, etc. were encountered in such a condition, the soil filled in the decayed structure that had lost its strength vigorously flowed out, damaging the slope, or planting. There were dangers such as the trees falling down, the roots being exposed and the growth of the planted trees being suppressed. The present invention has been made in view of the above situation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slope revegetation frame which can be constructed simply and efficiently, can stably hold soil necessary for growing tree seedlings, and can utilize waste materials such as thinned wood. It is an object of the present invention to provide a slope revegetation method capable of efficiently reforesting a slope using the slope revegetation frame.

[0010]

The invention according to claim 1 is a slope greening frame formed by connecting a pair of retaining walls made of a plurality of pieces of wood to each other at one end thereof. The two retaining walls are formed by alternately stacking each piece of wood on one of the retaining walls and each piece of wood on the other retaining wall at a connection portion between the two retaining walls. The above object has been achieved by providing a slope greening frame, which is provided on a slope so as to form a predetermined angle with each other.

According to a second aspect of the present invention, the pair of retaining walls are connected in a V-shape in plan view, and the connecting portion of the two retaining walls is directed to the valley side. The above object has been achieved by providing the described slope greening frame.

According to a third aspect of the present invention, at the end of the retaining wall opposite to the connecting portion, the ends of each piece of wood constituting the retaining wall are bound together. The above object has been achieved by providing a slope greening frame according to Item 1 or 2.

According to a fourth aspect of the present invention, at the end of the retaining wall opposite to the connecting portion, the end of each piece of wood constituting the retaining wall contacts the slope. The above object has been achieved by providing a slope greening frame according to any one of claims 1 to 3 that has been made.

According to a fifth aspect of the present invention, a water permeable sheet is disposed on the mountain-side wall surface of the both retaining wall portions, and a gap between each wood in each retaining wall portion is formed by the water permeable sheet. The above object has been attained by providing the slope greening frame according to any one of claims 1 to 4, which is closed by:

According to a sixth aspect of the present invention, the earth retaining wall portion is fixed to the slope by a pile erected on the slope. The above object has been achieved by providing a frame.

According to a seventh aspect of the present invention, there is provided a method of filling a slope greening frame according to any one of claims 1 to 6 with soil and planting trees in the slope greening frame. The above object has been achieved by providing a characteristic slope greening method.

[0018] The invention according to claim 8 provides the slope revegetation method according to claim 7, wherein seedlings are planted in the guest soil from gaps between the respective woods constituting the retaining wall portion. The above object has been achieved.

According to a ninth aspect of the present invention, a soil retaining wall having an opening for tree planting is installed on a slope, and soil is piled on the mountain side of the soil retaining wall, and the opening is formed. A slope revegetation method that provides a slope revegetation method characterized by planting a tree in the soil through the soil, whereby a natural landscape is formed at an early stage and an efficient reforestation of the slope can be achieved. Is provided.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first preferred embodiment of the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a perspective view showing a slope greening frame of the first embodiment,
FIG. 2 is a schematic view showing a state where the soil is filled in the frame for greening the slope of FIG. 1 and seedlings are planted. FIG. 3 is a cross-sectional view schematically showing a state one to two years after planting. is there.

First, the slope greening frame of the first embodiment will be described in detail. The slope 1 greening frame 1 of the first embodiment includes:
As shown in FIG. 1, a slope greening frame formed by connecting a pair of retaining walls 3A, 3B made of a plurality of pieces of wood 2, 2, respectively, to each other at one end,
The both retaining walls 3A, 3B are connected to the retaining walls 3A, 3B.
At the connecting portion 4 of 3B, each piece of wood 2,2. On one of the retaining wall sections 3A and each piece of wood 2,2, on the other retaining wall section 3B.
Are alternately stacked, and are installed on the slope 5 so as to form a predetermined angle with each other. Desirably, each piece of wood is installed with the base opening toward the connecting portion and the end opening toward the end.

Each of the pair of retaining walls 3A, 3B is made of three pieces of wood 2, 2, respectively. Each wood 2
Is wood having a substantially circular cross section, and the diameter of each wood 2 (the diameter of the portion having the largest diameter) is 10 to 30 cm, preferably 10 to 20 cm. It is preferable that each wood 2, 2 · has a small difference between the maximum diameter and the minimum diameter. The length of each wood 2,2 is 1 to 5 m, preferably 2 to 4 m. The species of the wood 2 is not limited, but conifers such as cedar and hinoki are preferable from the viewpoint of anti-rotting property. Each of the woods 2 may be subjected to an ant-proof treatment or an antiseptic treatment in order to improve durability. The wood in the present invention also includes bamboo. Each of the woods forming the above retaining walls 3A, 3B 2,
2) may vary in diameter and length, but it is desirable to use a uniform one.

The pair of retaining walls 3A, 3B are connected at their respective ends in a V-shape in plan view, and the connecting portions 4 of the retaining walls 3A, 3B are directed to the valley side. ing. In the connecting portion 4, one of the retaining wall portions 3A
And the other timbers 2,2. Of the other retaining wall 3B are alternately stacked, and the respective timbers 2,2. Are formed with predetermined gaps 6,6. In the connecting portion 4, the timbers 2, 2 are crossed such that the ends of the timbers 2, 2 slightly project from the crossing portions of the timbers 2, 2.

The pair of both retaining walls 3A, 3B are installed on the slope 5 so as to form a predetermined angle with each other.
The angle formed by the two retaining walls 3A and 3B can be appropriately adjusted according to the condition of the slope of the slope 5;
60 degrees, particularly preferably 90 to 120 degrees. When the slope of the slope 5 is steep, it is preferable to increase the angle between the retaining walls 3A and 3B to disperse the load in the downward direction, and conversely, when the slope of the slope 5 is gentle. The angle between the retaining walls 3A and 3B can be appropriately reduced.

At the end of each of the retaining walls 3A and 3B opposite to the connecting portion 4, the retaining wall 3 is provided.
A, 3B, ends 2a, 2a.
Are bound together by a line 7. In this manner, by binding the ends 2a of the wood, the slope greening frame 1 is formed.
Becomes more robust and the soil retention is improved. At the ends of the retaining walls 3A, 3B opposite to the connecting portion 4, the ends 2a, 2a of the woods 2, 2, constituting the retaining walls 3A, 3B are respectively It is in contact with the slope 5. Ends 2a, 2a of each wood 2, 2,
・ If each is brought into contact with the slope 5, the slope greening frame 1
The stability of the slope is improved and the slope greening frame 1 is
Even if it is installed in the slope, the slope greening frame 1 or the individual wood 2 does not move to the valley side of the slope 5 while being shifted.

The two retaining walls 3A and 3B are fixed to the slope 5 by a plurality of piles 8 driven into the slope 5 so as not to collapse to the valley side. Each pile 8 is a retaining wall 3
It is erected so that it contacts the wall of the valley side. One stake 8a of these stakes 8 is used as the two retaining walls 3A, 3B.
Is provided so as to abut on both of the retaining walls 3A and 3B.

The wall surface on the mountain side of the retaining wall portion 3 is shown in FIG.
As shown in (1), a water-permeable sheet 8 that has water permeability and does not easily pass through the soil is provided for the purpose of preventing the outflow of the soil. The water-permeable sheet 9 closes the gaps 6, 6 between the woods 2, 2 in the retaining walls 3A, 3B. The water-permeable sheet 9 is laid so as to cover the wall surface on the mountain side of the retaining wall portion 3 and a part of the slope surrounded by the slope greening frame 1.

As the water permeable sheet 9, a mesh sheet, a nonwoven fabric, a coco fiber sheet, a coconut (inawawara sheet), a biodegradable sheet and the like are used. Those which are naturally degraded are preferred. The slope greening frame 1 is assembled on the net 14 after a net (net-like body) 14 is laid on the slope 5 and fixed with an anchor or the like.

A scent may be installed on the wall surface on the mountain side of the retaining wall portion 3 and / or the slope surrounded by the slope greening frame 1, and a water-permeable sheet 9 may be laid on the scent. By installing a scent, drainage is ensured and the planted trees grow better. As the above-mentioned scent, a plurality of tree branches having a diameter of 3 cm or less cut out by lower pruning and the like are bundled into a length of about 1 to 2 m and a diameter of about 10 to 20 cm and tied.
If a tree branch having good rooting properties, such as willow, is used for this scent, the scent itself will take root and the valley side surface of the holding frame can be stabilized.

Next, the slope greening method using the slope greening frame 3 assembled as described above, that is, the first embodiment of the slope greening method of the present invention will be described. First, as shown in FIG. 2, the soil 10 is filled in the slope greening frame 1.
The soil used for the above-mentioned soil 10 may be any soil as long as the plant can be cultivated, and is added to ordinary soil such as black soil, red soil, and masago, a soil improving material, a fertilizer, and the like to be added to be suitable for plant growth. Culture soil is used.

In order to fill the soil 3 into the slope greening frame 3, a method of spraying or laying the soil 10 with a high-rise spraying machine or a pumping machine, or a method using a crane to fill a bag filled with sandbags is used. For example, a method of hanging a soil is used. Next, tree seedlings 11 are planted in the slope greening frame 1 filled with the soil 10. That is, the seedlings of the grown trees,
It is planted in the planting hole dug on the upper surface of the guest soil 10. The number of tree seedlings to be planted in the slope greening frame 1 may be appropriately determined according to the size of the slope greening frame 1 and the like.

As seedlings to be planted, seedlings of various kinds of trees commonly used for forestation of slopes can be used without any particular limitation.
Select and use plants that are suitable for vegetation around the land and those that are useful for landscape formation. For example, when the vegetation is a target vegetation, it is possible to select Sudajii, Tsuburazii, Aracashi, Vladinki, Shirakashi, Akagasi, Tabunoki, Yabunikei, Shirodamo, Yabutsubaki, Mochinoki, Hisakaki, Aoki and the like. Also, for example, when the target vegetation is deciduous broad-leaved forest, beech, falconaceae such as Mizunara, Hauchiwa maple, yamamomiji, itaya maple, white birch, birch birch, yamazakura, mayumi, tsuribana, zelkova, harunire, souramimi, wig, fir genus,
Genus hemlock, genus pine, kuromoji, witch hazel, aoki, japonica camellia, yuzuriha, dogwood, yamashikimi, and the like can be selected.

Further, each of the woods 2 constituting the slope greening frame 2
Trees are also planted in the gaps 6, 6 formed between 2. The roots of the trees planted in the gaps 6 and 6 formed between the timbers 2 and 2 are sufficiently stretched, so that even if the timbers 2 and 2 lose their retaining function due to decay, the customer soil layer can be stably maintained. Can be kept. In this case, as shown in FIG.
Potted seedlings 1 as well as seedlings to be planted on the upper surface of the slope greening frame
2, but may be planted by inserting a branch 13 of a tree having good rooting properties such as willow. Tree species with good rooting properties, such as willow,
Rooting, sprouting, and growing immediately after cutting, the slope greening frame 1 can be stabilized early. In addition, if trees are planted in the gaps 6, 6 formed between the timbers 2, 2, the above-ground parts (stems, leaves, etc.) of the planted trees will grow and prosper quickly, and Since the greening frame is covered and hidden, and the slope greening frame 1 is difficult to be seen from below the slope, the landscape from below the slope is extremely good.

Then, the slope 5 on which the slope greening frame 1 is installed.
A vegetation base material 15 containing herbaceous seeds, peat moss, park compost, etc., is sprayed on the whole with a spraying machine or the like. By simultaneously spraying the vegetation base material 15 on the valley-side wall surface of the slope greening frame 1, the covering effect of the plant is further improved. If the vegetation base material 15 is a mixture of herbs and tree seeds, the entire slope can be covered with plants at an early stage. Even in this case,
Trees that have grown to such an extent that they are not pressed by the plants are planted in the slope greening frame 1, so that after construction, tree seedlings grow and finally a slope having the target vegetation is obtained. . Normally, a plurality of slope slope greening frames having the same configuration as the slope slope greenery frame 1 are dispersed and arranged on the slope to achieve a forestation of the entire slope. In this case, the same type of tree may be planted in each of the plurality of slope greening frames, or different types of trees may be planted.

According to the slope greening frame 1 of the first embodiment described above, it is possible to obtain a slope greening frame that can be easily and efficiently constructed and can stably hold the soil required for growing tree seedlings. it can. In addition, since the gaps 6, 6 are formed between the timbers 2, 2, the thinnings generated by cutting a part of the timber, the cores generated in the lumbering process, and the cuttings cut down during renewal of the coppice forest Trees can also be used. Therefore, it is easy to use the cut timber in the area near the construction site, and it is possible to greatly reduce the cost of transporting the material.

Further, since the retaining walls 3A and 3B are connected in a V-shape in plan view, they are excellent in strength, their shape is maintained stably, and they are suitable for severe rainfall, snowfall, snow melting and the like. Even if it encounters, the soil filled in the slope greening frame 1 can be stably held in the slope greening frame 1. In addition, construction at the site is extremely easy and the cost is low, and it is possible to achieve healthy greening especially on steep slopes or poorly lands.

At the opposite ends of the retaining walls 3A, 3B from the connecting portion 4, the ends of the woods 2, 2 constituting the retaining walls 3A, 3B are respectively connected. Because it is in contact with the slope, and the gaps 6, 6 between the timbers 2, 2, open diagonally upward on the valley-side wall surface,
Tree planting in the gaps 6, 6 is easy. In addition, since the slope greening frame 1 is made of wood, the slope greening frame 1 does not adversely affect the natural environment or significantly degrade the landscape.

Further, according to the slope greening method of the first embodiment using the slope greening frame 1, trees can be planted in the gaps 6, 6 between the timbers 2, 2, and so on. Greenery frame 1
Because the valley side wall can be covered with plants early,
The landscape from below the slope can be a preferable landscape close to nature. In addition, since the slope revegetation frame 1 is made of natural wood, it will decay and will not remain as a structure. can do. In addition, since tree seedlings are planted, there is an advantage that the planted seedlings are not subjected to pressure from other plants and that there is no restriction on construction time, which is a problem in sowing work. Moreover, construction on site is extremely easy and low cost, and it is possible to achieve healthy greening especially on steep slopes and poorly lands.

Next, a second preferred embodiment of the present invention will be described with reference to FIG. The slope greening frame 1 ′ of the second embodiment is an embodiment more suitable for a steep slope (for example, a slope of 30 degrees) than the slope greening frame 1 of the first embodiment. In the slope slope greening frame 1 'of the second embodiment, each of the retaining walls 3A, 3B is inclined toward the mountain side, and each of the timbers 2, 2,. Although the arrangement is different from the slope greening frame 1 of the first embodiment, the other basic configuration is the same as that of the slope greening frame 1 of the first embodiment. Therefore, hereinafter, the points different from the slope greening frame 1 of the first embodiment will be mainly described, and the same parts will be denoted by the same reference numerals and description thereof will be omitted.

In the second embodiment, each retaining wall 3
A, 3B, a pair of timbers 2, 2 located at the lowermost position, a pair of timbers 2, 2 located at an intermediate portion of the retaining wall portions 3A, 3B, and a pair of timbers 2, 2 located at the lowermost position of the retaining wall portions 3A, 3B. A pair of timbers 2 and 2 located at the upper part are connected to each other at a connecting portion 4 by a connecting tool 16 such as a bolt. In this way, by providing a hole at the intersection of the two pieces of wood and fixing it with the connector 16 such as a bolt, the wood can be prevented from sliding in an oblique direction, and the strength can be improved. In addition, the installation work can be efficiently performed by opening a V-shape and fixing it to the slope using the bolt passed through the hole as a fulcrum. And the retaining wall 3A,
One pile 8a, 8b, 8c is erected on each of the pair of left and right timbers 2, 2 connected to each other at the connecting portion 4 of 3B, and the step-like shape of each of the retaining walls 3A, 3B is provided. Is more stably held by the three piles 8a, 8b, 8c.

The same effect can be obtained by the slope greening frame 1 'of the second embodiment as in the slope greening frame 1 of the first embodiment. Moreover, similarly to the slope greening method of the first embodiment, the slope greening frame 1 ′ of the second embodiment.
Can be used to turn the slope into a forest.

The forestation method according to the first and second embodiments is a preferred embodiment of the invention described in claims 7 to 9.
That is, in the invention according to claim 9, a slope wall 5 (a slope greening frame 1) having an opening for tree planting (a gap 6) is provided on the slope 5, and the slope wall 5 is provided with a slope. The soil 10 is piled on the mountain side of the wall (frame 1 for slope greening) and the opening (gap 6).
Trees 12 and 13 are planted in the soil 10 through the above.
According to the ninth aspect of the present invention, the valley-side wall surface of the retaining wall is formed by a tree earlier regardless of whether the material for forming the retaining wall is wood or wood. And a natural landscape can be formed early on the slope. In addition, the soil retaining wall is stabilized by the tree roots planted from the opening.

The wall for retaining wall according to the ninth aspect of the present invention is not particularly limited as long as it has an opening for tree planting and has a retaining wall function. 1
However, the present invention is not limited to this. For example, an opening for tree planting may be provided in a part of a wall formed by stacking a plurality of wood pieces in a vertical direction without gaps. It is preferable to provide an appropriate outflow preventing means such as the water permeable sheet 9 in the tree planting opening in order to prevent the soil from flowing out from the opening.

Although the first and second embodiments of the slope greening frame and the slope greening method of the present invention have been described above, the present invention is not limited to the above embodiments.
Modifications can be made as appropriate without departing from the spirit of the present invention.

In the slope greening frames of the first and second embodiments, the ends of the respective wood pieces at the ends of the retaining walls 3A and 3B opposite to the connecting portion 4 are respectively in contact with the slopes. However, the ends of the respective wood pieces may be stacked in the vertical direction. In addition, one of the retaining walls is arranged perpendicularly to a straight line connecting the mountain side and the valley side of the slope, and a pair of retaining walls is connected to both sides of the retaining wall, and a central retaining wall is provided. The connecting portion between the wall portion and the pair of left and right retaining walls is, like the connecting portion 4 of the first or second embodiment, connected to each wood of one retaining wall portion (central retaining wall portion). Each of the other retaining walls (a pair of left and right retaining walls) may be formed so as to be alternately stacked with the respective wood. In this case, it is preferable that the pair of left and right retaining walls be separated from the valley side toward the mountain side.

Also, instead of or in addition to providing the pile 8a in the first embodiment on the valley side of the retaining wall,
A through hole penetrating all the wood may be formed and disposed so as to penetrate the through hole. In this case, the installation work can be efficiently performed by hitting a pile before assembling the wood, and using the pile as a fulcrum, each wood is sequentially opened in a V-shape and fixed to the slope. When the slope of the slope is 30 degrees or more, or when there is a concern about the outflow of soil to be occupied, such as in an area with a large amount of rainfall, the intersection of the timber should be 4 mm in diameter.
It may be installed by shaving it from both sides by about one-half to reduce the gap between the woods.

The number of woods constituting each retaining wall can be appropriately determined in accordance with the width and inclination of the slope to be made into a forest. It is preferably from 5 to 5, especially from 3 to 4.
Further, the timber constituting each of the retaining walls may be a square lumber. There is no particular limitation on the method of fixing the wood as long as the wood can be stably fixed. However, a method of fixing the wood by driving a pile (anchor) into the slope or fixing the wire using a wire (wire) is used. Is used. The stakes are installed immediately below the connection portion or at the end of the wood on the side opposite to the connection portion, and may be provided more if necessary.
The connecting portion of the retaining wall may be fixed using a wire, and the end opposite to the connecting portion may be fixed using a stake. When fixing using piles, it is good to bind wood. still,
The description omitted part in one embodiment of the present invention, and the requirements which only one embodiment has, are appropriately applied to other embodiments. Further, the requirements in each embodiment can be interchanged between the embodiments.

[0047]

According to the present invention, there is provided a slope revegetation frame capable of stably retaining soil required for growing tree seedlings and capable of utilizing waste materials such as thinned wood, and a slope revegetation frame. It is possible to provide a slope revegetation method that can be used to efficiently turn a slope into a forest.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a slope greening frame according to a first embodiment.

FIG. 2 is a partial cross-sectional perspective view schematically showing a state in which a soil is filled into a slope greening frame of FIG. 1 and seedlings are planted.

FIG. 3 is a cross-sectional view schematically showing a state one to two years after tree planting.

FIG. 4 is a perspective view illustrating a slope greening frame according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 Slope greening frame 2 Wood 3, 3a, 3b Retaining wall part 4 Connection part 5 Slope 6 Clearance 8 Pile (anchor) 10 Guest soil (soil) 11, 12 Tree seedling (pot seedling) 13 Cutting For branch 15 vegetation base material

Claims (9)

[Claims] 1. A slope greening frame in which a pair of retaining walls made of a plurality of pieces of wood are connected to each other at one end, respectively. At the connecting portion of the retaining wall portion, each of the lumber of one of the retaining wall portions and each of the lumber of the other retaining wall portion are alternately stacked and formed so as to form a predetermined angle with each other. A slope greening frame, which is installed on a surface. 2. The slope greening frame according to claim 1, wherein the pair of the retaining walls are connected in a V-shape in plan view, and a connecting portion of the two retaining walls is directed to the valley side. . 3. The method according to claim 1, wherein ends of each of the woods constituting the retaining wall are bound to each other at an end of the retaining wall opposite to the connecting portion. Greening frame. 4. An end portion of each of the woods constituting the retaining wall portion is in contact with a slope at an end of the retaining wall portion opposite to the connecting portion.
3. The slope greening frame according to any one of 3. 5. A water-permeable sheet is provided on a wall surface on the mountain side of the both retaining wall portions, and a gap between each wood in each retaining wall portion is closed by the water-permeable sheet. The slope greening frame according to any one of claims 1 to 4. 6. The slope revegetation frame according to claim 1, wherein the retaining wall portion is fixed to the slope by a pile standing on the slope. 7. A slope revegetation method, characterized by filling a soil into the slope revegetation frame according to any one of claims 1 to 6, and planting trees in the slope revegetation frame. . 8. The slope revegetation method according to claim 7, wherein seedlings are planted on the soil from gaps between the respective woods constituting the retaining wall. 9. A soil retaining wall having an opening for tree planting is installed on the slope, and soil is piled on the mountain side of the soil retaining wall, and a tree is introduced into the soil through the opening. A slope revegetation method characterized by planting.