JP2002363991A - Seeding and planting works for hard steep slope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide seeding and planting works for a hard steep slope forming a stable vegetation base by preventing the separation and slip-off of a sprayed base material and improving compatibility between the sprayed base material and the natural ground, and attaining the early restoration of a natural landscape by avoiding the pressure of a herbaceous kind and the penetration delay of a native arboreal kind and advancing smooth plant succession. SOLUTION: A vegetation mat 2 is provided with a herb growing bed 7 and an arbor growing bed 8. The herb growing bed 7 has a vertical dimension of 25-35 cm and is sprayed with a thick layer base material 5 containing speeds, and grass flourishes to attain early greening. In the arbor growing bed 8, a continuous bag group 9 with a width of 10-30 cm comprising a plurality of bag parts 12a filled with artificial soil not intermixing seeds is placed on a base mat 6 of felt. While catching flying arboreal seeds, the influence of pressure from herbaceous plants growing on the herb growing bed 7 is suppressed to promote the growth of the native kind.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revegetation method for hard steep slopes, and more particularly, to early revegetation on a steep slope of hard ground by using a revegetation mat and a seed compound soil sprayed on the mat. It relates to slope revegetation that can restore the natural scenery and stabilize the mountain by local wood.

[0002] Recent greening works are required to use natural materials that are environmentally friendly and do not impose a load on nature as much as possible, and that can restore a natural scenery at an early stage. At present, the mainstream of greening slopes such as bedrock and hard soil is to spray thick-layer base material such as bark.However, the vegetation matting method based on a soil injection method and a natural material has been introduced. Attention is being paid to a construction method that can eliminate the drawbacks of substrate spraying.

[0003] The above-mentioned thick-layer base material spraying method, in which a wire mesh is sprayed on a base material, has a great deal of construction results, but it is easy to deposit bark material quickly and uniformly on a slope by mechanical means. It is. However, bark wood is susceptible to the weather and is organic, so it can be eaten by bacteria, and the soil needs to be replenished every time the thickness decreases. There are examples in which an adhesive is added to improve the adhesion to the ground, but the adhesive eventually deteriorates. Therefore, there are cases where the soil comes off or slides down in a few years, a wire mesh stretched over the ground, the ground surface is visible, and the vegetation is ruined.

[0004] In general, the soil is sprayed on the entire surface. However, the bark material suitable for growing the grass occupies a large part of the soil, making it easy to perform the spraying operation. Will be covered with herbs that germinate from the seeds in the soil. In this case, it is almost impossible to sort and spray the seed types, and it tends to be inevitable that the seeds are greened.

[0005] By the way, the growth of pastures is extremely vigorous. Therefore, when under pressure from grasses, the invasion and growth of local native woody species are hindered, and it takes a long time to restore the natural landscape familiar to the surroundings. Cost. In addition, the roots of the herbaceous plant only reach the rock surface and are easily peeled. Eventually, the ground will be exposed. However, it cannot be said that both the soil injection method and the vegetation mat method described above have been developed to the point where they can replace the thick base material spraying method at present.

[0006] In the soil injection method, a strong base cloth is used, so that the extension of the roots to the ground is hindered, and the deterioration of the soil deteriorates the vegetation. The invasion of native species also lacks smoothness. Vegetation mats tend to delay germination due to the poor water retention of the mat. It is inevitable that the mat will be lifted in the ground where the unevenness is severe or changes greatly. In addition, the workability is significantly reduced because the mat is stiffened against the ground.

[0007]

In each of the above examples, greening is mainly intended for pasture. But,
Early greening alone with herbs is just a visual measure,
In order to stabilize the slope, the introduction of native wood species is desired. Japanese Patent Application Laid-Open No. 2000-160561 proposes an example in which a bagged vegetation mat in which artificial soil is covered with a jute cloth, which is a natural fiber, is used as a skin to achieve this.

This is a vegetation mat in which artificial soil is placed on a thick base mat made of natural fibers, covered with a jute cloth, and held down with a large number of seams extending in a substantially horizontal direction when installed on a slope. . The artificial soil does not exist on the entire surface of the base mat, but some of the mountain-shaped portions formed between the seams are continuous, and a jute cloth closely adheres to the base mat so that the artificial soil does not exist. The part is intentionally left intermittently with a width of about one mountain-like part.

It is needless to say that the mountain-shaped portion is formed to hold the artificial soil, but the artificial soil is mixed with herbaceous seeds. In most aspects, early greening is achieved. The vegetation mat is overlaid with a cover net woven from a bundle of plant fiber yarns, so that it is easy to catch native woody seeds flying from the surrounding Yamano.

[0010] Among the captured seeds, the mountain-shaped portion is more susceptible to pressure from herbs, but the seeds in the flat portion are given a chance to germinate by avoiding pressure. Therefore, according to this vegetation mat, early greening by herbs and reconciliation with the surrounding landscape by local woody plants that grow spontaneously later are achieved at a delayed time, and through two-stage greening, the ground Is also stabilized.

The use of this vegetation mat has the advantage that the consumption of the soil can be greatly reduced. On the other hand, the following difficulties are inevitable. First, vegetation mats are placed on artificial soil on a base mat and then held down with a jute cloth for sewing. Moreover, since the needle is passed through the artificial soil, the seam is extremely coarse, and even if it is fine, it becomes 5 cm.

As a result, during transportation of the vegetation mat or the like, the artificial soil is biased to any one of the mountain portions, and when the artificial soil is laid on the slope, the bulk of the mountain portion becomes uneven. Occurs, and a lot of trouble and time are required to correct it. Further, although the area of the flat portion is about 30% of the whole, each is considerably smaller than the mountain portion, so that it takes a long time for native woody plants to thrive. Herbs contribute to early revegetation, but do not last long, and can even stagnate while waiting for wood to grow.

In order to improve such a thing even a little,
Attempts have been made to mix both herbaceous and woody seeds in the soil, but the coexistence of both species has led to pressure issues, and the vigorous growth of grasses has reduced the growth of woody plants. It is not easy to improve. If only one or two types of woody seeds are used with no or no herbs, it will become a single-species forest, giving a sense of incongruity in Japan with many coppices.

Incidentally, in this vegetation mat, since seeds and fertilizer are mixed in the artificial soil, there is no need to spray a thick base material on the mat. The reason is that the mountains are arranged on the entire surface of the mat even though it is coarse and dense,
This is because even if a thick base material is sprayed on a vegetation mat, it will only slide down, and it is difficult to expect the effect of the sprayed base material.

Japanese Patent Application Laid-Open No. 9-151458 discloses that vegetation bags manufactured one by one are arranged close to each other, sandwiched between a corrosive thin sheet and a coconut real fiber mat from above and below, and
A vegetation mat in which pins are fastened up and down is disclosed.
Also in this vegetation mat, since the seeds, fertilizers, and water retention materials are carried on the soil, spraying of the thick base material is not necessary. Assuming that the vegetation bag was sprayed,
Since they are arranged less densely than in the case of the example of Japanese Patent Application Laid-Open No. 0-160561, the action of holding the thick layer base material cannot be expected.

The vegetation mats of the kind described above have high rigidity because the vegetation bags are arranged in a daisy chain over the entire mat, and it is not easy to lay the mat unless it is well-organized. Therefore, in order to apply the method to hard soil, soft rock slope, non-soil land, and frost heap zone, appropriate conditions must be prepared, and it is undeniable that the flexibility of the laying surface decreases.

The present invention has been made in view of the above problems, and an object of the present invention is to solve the above three disadvantages as much as possible. Combining the advantages of thick-layer base material spraying and the benefits of vegetation matting, such as improving the familiarity between the timber and the ground, and forming a stable vegetation base, while the disadvantages of each are the herbaceous species' pressure. Another object of the present invention is to provide a hard steep slope revegetation method that can restore a natural scenery at an early stage by avoiding a delay in the entry of a native tree species or a native tree species and promoting smooth plant transition.

[0018]

According to the present invention, a greening mat is laid on a steep slope of a hard ground to promote early greening by herbs and promotion of spontaneous growth of native tree species. It is applied to slope revegetation works to restore the natural scenery in harmony with the ground and to stabilize the ground. The feature is that, with reference to FIG. 1, a plurality of bag portions 12 a in which artificial soil 11 (see FIG. 3 (c)) into which seeds are not mixed are loaded on a felt base mat 6. Reaming bag group 9 having a width of 10 to 30 cm L _T (see FIG. 6)
There are arranged at 25 to the 35 cm vertical spacing L _G (see Figure 6). A synthetic fiber net 10 is placed over substantially the entire base mat 6 so as to cover the continuous bag group 9 and the void 7 where the continuous bag group does not exist, and an edge of the synthetic fiber net and an end of the continuous bag group 9. The parts are sewn down at the edges of the base mat to form the vegetation mat 2 (see FIG. 8). When a large number of vegetation mats are laid on a predetermined slope so that the bag portions 12a are substantially horizontal, the wire mesh 4 is covered so as to cover the vegetation mat 2. The thick base material 5 containing the seeds of the herbs 17 (see FIG. 9) is moved toward the vacant space on the vegetation mat 2 which is adhered to the slope with the wire mesh fixed to the ground 1 with the anchor pins 16. To form a herbaceous growth floor 7. In the continuous bag group 9 that catches the flying seeds and is hardly pressed by the herbs growing on the herbaceous growth floor 7, the woody growth floor 8 that promotes the growth of native species is formed. It is.

The artificial soil includes organic soil such as humus and bark, and a water retention material such as peat moss. Charcoal can also be mixed into the artificial soil.

The base mat is preferably made of a felt in which anti-hair is mixed with a jute.

The opening of the synthetic fiber net is set to 20 to 30 mm. As shown in FIG. 8, it is preferable to provide a loop 10a inclined to the ground side in all or a part of the stitches.

As the bag portion, a synthetic cloth is used which hardly spills even if a bark material finely crushed to a size of 1 mm or less is loaded.

[0023]

According to the present invention, a space for artificial soil, mainly organic soil, which does not contain seeds is secured on a vegetation mat, which is used as a woody growth floor, and a thick layer containing grass seeds is provided. The herbaceous growth floor formed by spraying the base material can be provided so as not to overlap with the woody growth floor. As a result, early greening can be achieved, while spontaneous growth of native species of wood species that semi-permanently proliferates can be supported, and a natural landscape that is in harmony with the surrounding environment can be reproduced. The growth of woody plants also enhances the integration between the topsoil and the ground by planting roots that extend into the bedrock, thereby enhancing the stability of the slope.

The tree growing area formed by the continuous bag group is 10 to 30 cm, and the herbaceous growing area, which is the non-continuous bag group portion where the thick base material is deposited, is secured 25 to 35 cm. The herbaceous bed will occupy half or more of the vegetation mat, and in the initial stage, the woody stand waiting for seeds to fly will also be covered with herbaceous bushes grown on the herbaceous bed, and almost entirely over the vegetation mat. Early greening is achieved. On the other hand, since at least about 30% of the woody growing floor is left on the vegetation mat and the synthetic fiber net is also provided, the seed capture rate of native woody species can be increased.

The wire mesh contributes to fixation of the vegetation mat and suppresses the flow of the blown thick base material in cooperation with the synthetic fiber net, thereby increasing the water absorbing ability of the thick base material during rainfall. As a result, the water retention capacity of the vegetation mat is high, and germination is promoted not only on the grass growing floor but also on the wood growing floor.

If the artificial soil loaded in each bag portion forming the continuous bag group is composed of organic soil such as humus and bark wood and water retention material such as peat moss, captured native woody species In order to encourage the growth of the plant, a ground that is easy to take root is created, and assimilation with the surroundings is hastened. If charcoal is mixed in this artificial soil, the rooting activity is improved and the water retention can be improved.

If the base of the vegetation mat is used as a felt base mat in which jute is mixed with anti-hair, the water retention ability can be remarkably increased as compared with a jute base mat alone. In places where drought is severe, such as southward and westward slopes, the effect is greatly exhibited.

The synthetic fiber net which is put on the vegetation mat and sewn to the base mat is exposed on the group of consecutive bags on the woody growing floor when the mesh opening is set to 20 to 30 mm, and the native woody woods fly. It exerts an effect of trapping seeds and functions to strengthen the integration between the thick base material and the vegetation mat on the grass growing floor. If a loop inclined toward the ground side is provided in each knit of the synthetic fiber net, the capturing rate of flying seeds and the fixing rate of the thick layer base material can be further increased.

If each bag portion forming the continuous bag group is made of a synthetic fiber cloth which hardly spills even if bark material finely crushed to a size of 1 mm or less is loaded, flying bag seeds Capture is also possible on the synthetic cloth surface. On the other hand, it is difficult to prevent the roots extending from the trapped seeds from entering the bag.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a greening method for hard steep slopes according to the present invention will be described in detail with reference to the drawings showing the embodiments. FIG. 1 shows that a vegetation mat 2 for vegetation is laid on a steep slope portion of a hard ground 1, and that early greening by herbs and promotion of spontaneous growth of native woody species finally result in FIG. 2. As shown in the figure, it is possible to obtain a slope revegetation 3 which is designed to restore a natural landscape in harmony with the surrounding environment and to stabilize the ground.

This is to compensate for the disadvantages of the thick layer base material spraying work, the soil injection work, and the vegetation mat work described in the section of the prior art. The purpose is to create a groundwork that facilitates the germination and rooting of flying seeds so that they can be adapted to the landscape.

The hard steep slope revegetation 3 uses a vegetation mat laid on a steep slope portion of the hard ground 1 and a seed-containing thick layer base material sprayed on the vegetation mat as a soil to maintain the soil. It is intended for early greening. Therefore, as shown in FIG. 1, the vegetation mat 2, the wire mesh 4, and the thick base material 5 are provided.

In this revegetation work, the vegetation mat and the ground are well-fitted, and the integration between the vegetation mat and the spray base material is improved. By suppressing the pressure action and avoiding the delay of the indigenous tree species, smooth plant transition can be promoted, and the natural landscape can be restored early.

The vegetation mat 2 has a herbaceous growth floor 7 and a woody growth floor 8 formed on a base mat 6 repeatedly, as shown in FIG. As shown in (c) of the figure, it is composed of a base mat 6, a group of consecutive bags 9, and a synthetic fiber net 10. As shown in FIG. 3 (c), the continuous bag group 9 has one or two bags 12 loaded with artificial soil 11 containing no seeds, and in some cases, three bags 12 arranged in a vertical direction. L _T (see FIGS. 5 and 6) is no 30cm from 10, which constitutes a woody growth bed 8.

As shown in FIG. 3 (c), the bag 12 has a plurality of bag portions 12a, 12a (two in the illustrated example) arranged in a row, and one bag has a width. If it is manufactured at 10 cm, the consecutive bag group 9 will be at least 10 cm or 20 cm in FIGS. 5 and 6. These continuous bag group 9 is arranged at a vertical distance L _G of 25 to 35 centimeters, space portions formed between the continuous bag group and communicating bag group is secured as a herb growing bed 7.

[0036] FIG. 6 is an example in which are arranged at regular intervals on the base mat 6 of the communication bag group 9 of about 20 cm width L _T is felt. A synthetic fiber net 10 is put on substantially the entire base mat 6 as shown in FIG. 8 so as to cover the continuous bag group 9 and the void 7 where no continuous bag group exists. The vegetation mat 2 is manufactured by simultaneously sewing the edges at the edge of the base mat 6 (the seam is indicated by reference numeral 13). In addition, only the left and right edges of the base mat are sufficient for the stitching.

The felt base mat 6 described above has good familiarity with the soil. It is most suitable to mix and compress the anti-hair (thread waste obtained by dismantling various kinds of clothing of plant fiber, animal fiber and synthetic fiber) into the jute. The size depends on the length L ₉ (see FIG. 6) of the consecutive bag group 9; for example, a width W ₆ (see FIG. 8) of 110 cm and a length L ₆ of 310 cm is adopted. Is done.

Needless to say, jute is a natural fiber, which has a characteristic that it has a large instantaneous water retention capacity but is quickly dehydrated. The weight is 6 and the anti-hair is 4
If used in combination, the water retention capacity (the length of time that water is retained) can be increased by 30 to 40% compared to jute 100%. Where the slope faces south or west and drought is drastic, the effect is greatly expected.

Although the base mat 6 contains organic fibers and eventually rots, even if a part of the base mat 6 remains, it can be used to prevent digging if it adheres to the ground. For this reason, it is possible to prevent the ground from being washed and eroded for a long time.

The synthetic fiber net 10 is made of polyethylene, for example, raschel-knitted, and has an opening of 20 to 30 mm. Although this is a pollution-free product unlike vinyl chloride and the like, it can be used for about 10 years. By setting the openings to the above-described size, the space in the herbaceous breeding floor 7 can be easily filled when the thick base material 5 is sprayed (FIG. 1).
), And it is also easy to catch the incoming seeds of the woody plants on the woody growing bed 8. In short, it does not hinder the passage of the thick base material 5, and at the same time facilitates the regeneration of tree planting by native woody species.

The synthetic fiber net 10 may be provided with a loop 10a inclined to the ground side in all or a part of the stitches. This is because the loop always tends to slightly fall on one side for the sake of knitting. As shown in FIG. 8, if there is a loop that bypasses one side of the grid, the capturing rate of the flying seeds is further increased where the loop is exposed. On the other hand, where the loop is covered by the thick layer base material, the loop is buried in the thick layer base material and functions as a “susa”, thereby improving the holding power of the soil by the synthetic fiber net 10 and promoting the entanglement of the roots. Of course, it goes without saying that the integration of the thick layer base material 5 and the vegetation mat 2 is enhanced.

The bag 12 is made of a 0.3 to 1 mm synthetic fiber cloth. As shown in FIG. 3 (a), the smallest unit of the continuous bag group 9 is, for example, two synthetic fiber cloths 12b, 12b overlapped to form a Y-shaped fine perforation 1.
4, the bag body 12 is inflated as shown in (b), the artificial soil 11 is put in as shown in (c), and the entrance portion is machined as shown in FIG. is there.

This bag body 12 is different from the mountain-shaped part described in the prior art section in JP-A-2000-160561, in that:
It differs greatly in terms of partitioning ability. As shown in FIGS. 3B and 3C, the adjacent bags are completely separated from the adjacent bags by the perforations 14, and the artificial soil 11 is provided between the bag portions 12a.
Never move. Therefore, the same amount of soil is always present in each bag portion, and an uneven vegetation bed such as being unevenly laid when laying on a slope or thereafter is not formed.

The size of one bag portion 12a is about 5 cm in diameter and about 1 meter in length. The perforation interval for forming each bag portion must be at least 8 centimeters. After all, when the left and right seam allowances are included, each synthetic fiber cloth 12b is spread out as shown in FIG. It will be 20 cm x 1 meter.

The synthetic fiber cloth may be sufficient as a light-shielding net for cultivation, and the color is not black, but has a stitch that the bark material of 1 mm or less does not fall out. Therefore, as will be described later, a base material suitable for catching the seeds of the woody species is provided. This is made of non-perishable material such as polyester, but it has a certain degree of opening, and if it deteriorates, it will be ragged, which may hinder germination or prevent the root from entering the bag. There is no hindrance.

The bag body 12 is not limited to the two bag portions 12a, but if a large number of the bag portions 12a are manufactured, the continuous bag group 9 of various widths can be easily formed, which is convenient. 6 to form a single continuous bag group 9 side by side two bags 12, 12, for example at intervals L _G 30 centimeters which was ordered the following continuous bag group 9. In this way, a tree growth floor 8 of 20 cm and a plant growth floor 7 of 30 cm are formed on the vegetation mat 2, and this is repeated (see FIG. 7C).

In the case of a thick-layer base material, when the slope is extremely steep (for example, at an inclination of 45 degrees), the frequency of peeling and sliding increases when the slope exceeds 40 cm.
If the height is limited to 5 cm, the fixing property to the base mat 6 is kept high even at the above-mentioned inclination. Furthermore, the vegetation mat 2 has a continuous bag group 9 which supports the soil, prevents the thick base material from flowing out, and keeps the vegetation floor in a stable state for a long time.

In the vegetation mat having the above structure, as shown in FIG. 7 (a), a base mat 6 is first spread, and an appropriate number of bags 12, 12 are placed thereon as shown in FIG. 7 (b). The bag group 9 is arranged, and the synthetic fiber net 10 is covered as shown in (c), and the continuous bag group 9 and the synthetic fiber net 10 are placed on the base mat 6 as shown in FIG.
And sewn.

The vegetation mat 2 manufactured in a factory equipped with the equipment is carried into the site, and a large number of the vegetation mats are laid on a predetermined slope so that their edges are overlapped and the bags are substantially horizontal. As shown in FIG. 7 (d), a wire mesh (lass) 4 is covered so as to cover the vegetation mat 2, and the wire mesh 4 is fixed by appropriately hitting the anchor pins 16 as shown in FIG.

As the wire netting, a rhombic wire net having a size of 5 cm × 5 cm is sufficient. The vegetation mat 2 is adhered to the slope by the wire mesh 4 fixed to the ground 1, and the thick base material 5 is sprayed on the vegetation mat from above the wire mesh 4 toward the empty space 7 where the bag portion 12 a does not exist. Can be The sprayed bulk thickness is such that the wire mesh is almost invisible. Since the bag is about 5 cm high,
It is usually sprayed in 3-5 cm, slightly thicker layers depending on the climate.

In this way, the vacant space is covered with the thick-layer base material 5, and the herbaceous growth floor 7 on which the grass 17 grows eventually is formed as shown in FIG. On the other hand, the continuous bag group 9 forms the woody growing floor 8 which catches the flying seeds and is hardly subjected to the pressure from the herbs 17 growing on the thick base material.

Even if a part of the thick base material is covered by the continuous bag group 9, if there is rainfall, it immediately shifts to the herbaceous growth floor 7 below. To prepare for its growth at all times. In principle, the thick base material 5 is sprayed as guest soil while avoiding the continuous bag group 9 which is a woody growing floor, so the work of spraying the thick base material on site is reduced, and the cost is reduced. Contribute to the canopy.

The thick base material is mainly made of bark wood suitable for the growth of pasture, and water-retaining materials such as peat moss and fertilizers are mixed with herbaceous seeds as necessary. Bark wood is fermented using bark (bark) as chips, and is finely crushed. In addition, there is a continuous bag group 9 containing the artificial soil described below, so that even if sprayed as guest soil, it does not dry out early and rarely causes peeling. Seeds that germinate early or maintain green throughout the year, gazelle, white clover,
Yomogi, medhagi, bermudagrass, etc. are adopted, and greening is realized within a short period of time after slope construction.

On the other hand, the bag portion is filled with organic soil such as humus and bark, and artificial soil including a water retention material such as peat moss. This can be mixed with charcoal or vermiculite as needed. Charcoal activates plant roots and promotes growth. The larger the grains, the higher the water retention. Vermiculite is also porous, has water retention properties, serves as an inorganic soil improver, and also functions as a lightweight bulking material.
In any case, the flying woody plants germinate and tend to take root and have a soil structure and a water retention state. Both such artificial soil and the above-mentioned thick-layer base material can be mass-produced at present.

As can be seen from the above description, the hard greenery 3 for steep slopes has a four-layer structure of a base mat 6, a group of consecutive bags 9, a synthetic fiber net 10, and a wire mesh 4, and provides a firm vegetation base. It can be formed. Vegetation space to promote the invasion of native wood species will be secured, and after early greening by herbs, local woody species will achieve greening in harmony with the surroundings.

The synthetic fiber net stretched over the continuous bag group or the base mat greatly contributes to prevention of peeling and slipping of the sprayed thick layer base material. The presence of the vacant space allows the vegetation mat to have a flexible structure, and allows the vegetation mat to be closely laid even on a slope surface having large irregularities or drastically changing. Since a wire mesh is stretched over the entire laid vegetation mat and fixed firmly to the slope with anchor pins, the hard-steep slope greening work can be stabilized for a long time.

At the initial stage, the tree growing bed 8 is covered with long leaves and stems of the herbs 17 growing on the grass growing bed 7 as shown in FIG. Bag part 12a
(See (c) of FIG. 3), the synthetic fiber net 10 and the wire mesh 4 increase the trapping rate of the seeds of the native woody species that have flown in, and support the improvement of the fixing property in the bag base. Since no herbaceous seeds are put in the bag portion, there is no pressure to be applied if it is present, and an environment suitable for the growth of woody plants is cultivated in the continuous bag group.

Kimoto growing floor 8 defined from herb growing floor 7
Grassland loses momentum as native species grow more vigorously. Herbaceous plant roots spread beyond the base mat, but stick to the rock surface. When the vegetation floor is depleted or the herbaceous plants are nearing the dead state, the roots are easily peeled off, and the soil is easily washed away.

On the other hand, the roots of woody plants reach small rocks and cracks in the bedrock after reaching the rock surface, and strongly root in the ground. As shown in FIG. 2, the growth of the woody plants 18 also exerts an effect of fixing the vegetation mat 2 and the thick base material 5 to the slope. If the growth of woody plants progresses, the growth of the herbs 17 will deteriorate due to lack of sunshine and the like, and the grasses on the herbaceous growth floor 7 will grow only as undergrowth.

As described above, it takes time to sprout and grow woody plants spontaneously. Therefore, in the present invention, keeping this in mind, the tree planting until the native woody species 18 grows is carried out. It has a two-stage greening structure, such as a herbaceous plant 17. Vegetation mat 2 regulates the growth of woody plants and herbaceous plants, and eventually prospers the native species brought in from nearby Yamano, and reproduces the forest suitable for the land, and harmonizes with the surroundings. It will be possible to reproduce the natural scenery taken.

By the way, the vegetation mat may be different in area ratio between the woody growing floor and the herbaceous growing floor depending on the nature of the ground to which it is applied and the local environment. Since the herbaceous growth floor is formed by spraying a thick layer base material, the vertical length is set to be about 30 cm.
A vegetation mat having a configuration different from 10 cm or 20 cm may be used. Vegetation mats with different bag densities can be used depending on the size and intensity of the slopes.

It should be noted that if the slope of the slope is small, there is little concern about slipping, and therefore, it is not impossible to use a vegetation mat in which the upper and lower dimensions of the thick base material are as large as 40 cm or more. In that case, the individual dimensions may be determined in consideration of the water retention capacity and the fixation rate of native woody species in the consecutive bag group.

[Brief description of the drawings]

FIG. 1 is a sectional view of a slope showing a greening method for a hard steep slope according to the present invention.

FIG. 2 is a landscape view of a slope in a state where trees have been greened.

FIGS. 3A and 3B show a bag constituting a continuous bag group, FIG. 3A is a perspective view in which perforations are made to overlap a synthetic fiber cloth to form a bag, FIG. 3B is a cross-sectional view of an expanded state, and FIG. () Is a cross-sectional view in a state where artificial soil is loaded.

FIG. 4 is a perspective view of a bag body composed of two bag portions.

FIG. 5 is a plan view in which a continuous bag group including one bag is arranged on a base mat.

FIG. 6 is a plan view in which a continuous bag group including two bags is arranged on a base mat.

7A and 7B show a process of manufacturing a vegetation mat and a state where the vegetation mat can be applied to a slope, wherein FIG. 7A is a side view of a state where a base mat is spread, and FIG. The state diagram which arrange | positioned the bag group, (c) is the state diagram which wrapped the synthetic fiber net, and (d) is the state diagram which covered the wire mesh.

FIG. 8 is a plan view of a vegetation mat finished by sewing a synthetic fiber net.

FIG. 9 is a cross-sectional view of a slope greening work at a stage of early greening by herbs.

[Explanation of symbols]

 1: ground, 2: vegetation mat, 3: greening for hard steep slopes,
4 ... wire mesh, 5 ... thick layer base material (customer's soil), 6 ... base mat,
7: Herbaceous growing floor (vacant space), 8: Kimoto growing floor, 9: consecutive bag
Group, 10 ... synthetic fiber net, 10a ... loop, 11 ... artificial soil
Loom, 12a ... bag part, 12b ... synthetic cloth (cloth), 16 ...
Anchor pin, 17 ... herbaceous, 18 ... woody, L_G…Communicating
Vertical spacing between bag groups (length of grass growing floor), L _T… Kimoto
The vertical length of the breeding floor (width of the group of consecutive bags).

Claims (7)

[Claims] (1) A greening mat is laid on a steep slope of a hard ground, and the natural landscape is harmonized with the surrounding environment by early greening by herbs and promotion of spontaneous growth of native tree species. In a slope revegetation method for restoration and ground stabilization, 10 to 30 bags each consisting of a plurality of bags filled with artificial soil on which a seed is not mixed are placed on a felt base mat.
A group of consecutive bags having a width of centimeters are arranged at a vertical interval of 25 to 35 centimeters, and a synthetic fiber net is provided on substantially the entire base mat so as to cover the empty spaces where the continuous bag groups and the continuous bag groups do not exist. And the edge portion of the synthetic fiber net and the end portion of the continuous bag group are sewn at the edge portion of the base mat to form a vegetation mat, and the vegetation mat is fixed to a predetermined position so that the bag portion is substantially horizontal. When a large number of slopes were laid, the wire mesh was covered so as to cover the vegetation mat, and the seeds of herbaceous seeds were included toward the vacant space on the vegetation mat closely attached to the slope with a wire mesh fixed to the ground with anchor pins. A thick-layer base material is sprayed from above the wire mesh to form a herbaceous growth floor, and there is a continuous bag group that is hard to receive pressure from herbs growing on the herbaceous growth floor while capturing flying seeds. Encourage the growth of species Hard steep for greening engineering, characterized in that it has become a woody growth floor to be. 2. The revegetation method for hard steep slopes according to claim 1, wherein the artificial soil includes organic soil such as humus and bark, and a water retention material such as peat moss. 3. The greening method for hard steep slopes according to claim 2, wherein charcoal is also mixed in the artificial soil. 4. The greening method for hard steep slopes according to claim 1, wherein the base mat is a felt obtained by mixing anti-hair with jute. 5. The greening method for hard steep slopes according to claim 1, wherein an opening of the synthetic fiber net is 20 to 30 mm. 6. The greening method for hard steep slopes according to claim 1, wherein the synthetic fiber net is provided with a loop inclined to the ground side in all or a part of the stitches. 7. The synthetic fiber cloth according to claim 1, wherein the bag portion is made of a synthetic fiber cloth which is hardly spilled even when a bark material finely crushed to a size of 1 mm or less is loaded. The greening for hard steep slopes described.