JP2010095874A - Construction method and structure for performing greening of slope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for performing the greening of a slope, which enables the greening of the slope to be perpetually performed without reference to a construction site, even when the slope to undergo the greening is steep. <P>SOLUTION: A fiber-mixed-and-reinforced soil layer 10 is created on the slope G, and covered with a growth base material 20 so that the greening of the slope can be performed. In this case, before the creation of the fiber-mixed-and-reinforced soil layer 10, a rigid strip-shaped plate material 30 with many liquid permeation holes 30H is arranged in such a manner that an erection angle 30R falls within the range of 10-90° by fixing one side edge 30c to the slope G; the plurality of strip-shaped plate material 30 are arranged in such a manner that a liquid flow line directed to a base 11 from an upper surface part 12 crosses the strip-shaped plate material 30 in any position associated with a horizontal direction; and the creation thickness 10X of the fiber-mixed-and-reinforced soil layer 10 is uniformed from the base 11 to the upper surface 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a slope greening method and a slope greening structure. In particular, the present invention relates to a slope greening method and a slope greening structure that are suitable when the slope has a steep slope exceeding 60 °.

  Conventionally, as a method of greening the slope, there is a method of forming a fiber-mixed reinforced soil layer on the slope and covering the fiber-mixed reinforced soil layer with a growth base material. This method is currently being improved in various ways in order to enable greening of the entire surface. For example, Patent Document 1 discloses that a net is laid on a continuous fiber reinforced earthwork and a pin is attached to the continuous fiber reinforced earthwork. The method of inserting

  However, although this conventional method is excellent in greening countermeasures in that the stability of the surface layer is high, in reality, if the slope of the slope is a steep slope exceeding 60 °, the growth limit slope of the plant is set. Therefore, there is a problem that the growth of the plant is inhibited and the plant cannot be permanently greened.

  Therefore, at present, the gradient correction is performed so that, for example, the formation thickness of the fiber-mixed reinforced soil layer is 100 to 150 cm at the base and 20 to 50 cm at the top, for example. Therefore, a method for permanent greening is also used.

However, depending on the construction site, such gradient correction may not be performed. For example, if the slope beside the track in the railroad industry is a slope to be planted, if the construction is in the suburbs, generally the distance between the slope and the track is wide, and the thickness of the foundation of the fiber-reinforced reinforced soil layer However, if it is construction in an urban area, the gap between the slope to be planted and the track is narrow, and the foundation thickness of the fiber-reinforced reinforced soil layer cannot be increased. There is a problem with being unable to do.
JP 2004-169289 A

  The main problem to be solved by the present invention is to provide a slope revegetation method and a slope revegetation structure capable of permanent revegetation regardless of the construction site even when the slope to be replanted is steep. There is to do.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
A method of constructing a fiber-mixed reinforcing soil layer on a slope, covering the fiber-mixed reinforcing soil layer with a growth base material, and greening the slope,
Prior to the formation of the fiber-mixed reinforced soil layer, a plurality of rigid strip-shaped plate materials having a large number of liquid-permeable holes are disposed so as to satisfy the following conditions:
The formation thickness of the fiber-mixed reinforcing soil layer is uniform from the base portion to the top end portion,
Slope greening method characterized by that.
〔conditions〕
The plurality of strip-shaped plate members are arranged such that one side edge portion is fixed to the slope, and an upstanding angle with respect to a surface from the fixed portion toward the upper side of the slope is 10 to 90 °, and At any position in the horizontal direction when the fiber-mixed reinforcing soil layer is viewed from the front, the liquid flow line from the top end portion to the base portion is arranged so as to intersect with at least one of the plurality of strip-shaped plate members. To do.

[Invention of Claim 2]
The slope greening method according to claim 1, wherein at least one of the plurality of strip-shaped plate members is disposed so as to be continuous in the horizontal direction.

[Invention of Claim 3]
The plurality of strip-shaped plate members that are continuous in the horizontal direction are configured such that a pair of adjacent strip-shaped plate materials are symmetrically sandwiched between the adjacent portions, and each strip-shaped member is inclined by 45 to 60 ° with respect to the horizontal direction. The slope greening method according to claim 2, which is disposed in

[Invention of Claim 4]
A greening structure of the slope in which a fiber-mixed reinforced soil layer is formed on a slope, and the fiber-mixed reinforced soil layer is covered with a growth base material,
A plurality of rigid strip-shaped plate materials having a large number of liquid-permeable holes are disposed on the slope so as to satisfy the following conditions:
The formation thickness of the fiber-mixed reinforcing soil layer is uniform from the base to the top end,
Slope greening structure characterized by that.
〔conditions〕
Each of the plurality of strip-shaped plate members is arranged such that one side edge portion is fixed to the inclined surface, and an upstanding angle with respect to a surface from the fixed portion toward the upper side of the inclined surface is 10 to 90 °, and the fiber At any position in the horizontal direction when the mixed reinforcing soil layer is viewed from the front, the liquid flow line from the top end portion to the base portion is arranged so as to intersect with at least one of the plurality of strip-shaped plate members. Yes.

  According to the present invention, even when the slope to be replanted has a steep slope, the slope revegetation method and the slope revegetation structure can be permanently replanted regardless of the construction site.

Next, an embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, the slope greening method of this embodiment forms a fiber-mixed reinforcing soil layer 10 on the slope G, and covers the fiber-mixed reinforcing soil layer 10 with a growth base material, for example, The growth base material layer 20 is formed and the slope G is greened. In addition, the slope greening structure of this form constructed | assembled in this way is shown with the code | symbol 1. FIG.

  The slope G to be constructed by the slope greening method of this embodiment is not particularly limited. For example, road slope, railway slope, dam-related slope, residential land / factory site, park slope, golf course law Can be applied to slopes such as slopes, steep slopes, hillside collapse sites, existing mortar / concrete spraying surfaces, etc., for example, full coverage of existing method frames and anchor pressure plates, and the entire surface of existing retaining walls In covering and the like, the slope greening method of this embodiment can also be adopted.

Fiber incorporation reinforced soil layer 10 of this embodiment, the fiber incorporation reinforced soil by a known method, for example, discharging the fiber incorporation reinforced soil was air conveyed from the spray nozzle tip pressure 2~15kg / cm ² (0.2~1 0.5 MPa), and spraying at a spraying flow rate of 0.2 to 2.0 m ³ / min.

  The fiber-mixed reinforcing soil can be obtained by appropriately mixing fibers, a solidified material, soil, and the like. The mixing method of these various materials is not particularly limited, and for example, various materials can be supplied to a stirrer such as an agitator and all materials can be mixed at the same time. However, since the physical properties are different for each material, it is preferable to sequentially supply and mix various materials according to the characteristics in the transport process of a stirring transport device such as a ribbon screw conveyor.

  The type of soil to be mixed as the fiber-mixed reinforcing soil is not particularly limited. Examples include soils such as Kanuma soil, vermiculite, perlite, artificial zeolite, natural zeolite, diatomaceous earth, bentonite, kaolin, shirasu, Kanto loam, peat, chips, bark compost, and coal ash. In particular, the use of waste soil generated during civil engineering work or on-site generated soil, sewage sludge, water sewage sludge, sludge, etc. generated during the shaping and processing of slopes to be constructed will reduce raw material costs. Can be preferable.

  The type of fiber mixed as the fiber-mixed reinforcing soil is not particularly limited, and either short fiber or long fiber can be used. By mixing the fibers, the soil particles and the fibers are bonded to each other by friction, and as a result, the fibers interfere with the movement of the soil particles, and when they try to deform under force, they act as tensile reinforcements, and the tensile force Accordingly, a binding force is generated, and a pseudo adhesive force is applied to the soil. However, from the viewpoint of promoting the entanglement with the band-shaped plate material 30 described later, thereby improving the moisture retention performance in the fiber-mixed reinforced soil layer 10 and the strength of the fiber-mixed reinforced soil layer 10 itself, the long fibers are preferred. preferable.

  In this embodiment, as the long fiber, it is preferable to use a bulky processed yarn or a conjugate yarn which is a continuous long fiber, and it is more preferable to use a bonded yarn. When this type of yarn is used, there is an advantage in that the area of friction with air increases when pumped as the fiber, and the transportability is further improved. Further, since it is easy to break during spraying, a strip-shaped plate material 30 described later is provided. There is also an advantage that it is easy to be entangled with each other and adhesion to the soil is increased.

  The number of crimps of the continuous long fibers is preferably 50 to 9000, more preferably 100 to 3,000 per 25 m of JIS L 1015. In addition, as continuous long fibers, it is more uniformly dispersed on the slope G when 2 to 40 fibers of 50 to 1000 d (denier) are bundled and sprayed than to spray one thick fiber of total denier. (Ballet) is preferable because the stability of the slope G is improved.

  In this embodiment, the material of the long fiber is not particularly limited, and for example, a series of resins such as polyester, polyamide, acrylic, polyvinyl alcohol, polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride, acetate, and vinylon are employed. be able to. However, among these, polypropylene is preferable, and vinylon is more preferable. In particular, when cement is used as the solidifying material, it is preferable to use polypropylene having excellent alkali resistance, but polypropylene has a property that it is difficult to adhere to cement. On the other hand, since vinylon is excellent in alkali resistance and adhesiveness with cement, it is more preferable than polypropylene. Vinylon is preferable because it has higher strength and higher fineness than polypropylene, and thus fiber-reinforced reinforced soil having higher strength and excellent deformation performance can be obtained.

  The amount of long fibers mixed is preferably 0.1 to 10%, more preferably 0.1 to 1.0%, based on the total mass of the fiber mixed reinforcing soil. If it is less than 0.1%, sufficient pseudo-adhesiveness cannot be obtained. On the other hand, if it exceeds 10%, the effect of increasing pseudo-adhesive enough to meet the cost increase cannot be obtained.

  In this embodiment, short fibers can be mixed instead of the above long fibers or together with the above long fibers. When short fibers are mixed into the fiber-mixed reinforced soil, a whisker-like granulated product of the fiber-mixed reinforced soil is formed, and the soil reinforcing effect is improved by the entanglement effect (binder effect).

  In this embodiment, the material of the short fiber is not particularly limited. For example, non-biodegradable materials such as polyester, polypropylene, polyethylene, PET, carbon, nylon, vinylon, aramid, carbon fiber, cotton, hemp, kenaf, bagasse Biodegradable materials such as rayon, acetate, and cupra can be used. However, among these, polyester is preferable. Polyester fibers have good compatibility and dispersibility with soil and solidified materials, and are inexpensive.

  The short fiber has a length of 5 to 50 mm, preferably 10 to 30 mm, a thickness of 3 to 50 denier, preferably 10 to 30 denier, a number of crimps of 10 or less, preferably 2 to 7 and a crimp rate of 20%. In the following, preferably 2 to 15% can be used. When the thickness of the short fiber is less than 3 denier, even if the fiber length is increased to increase the entanglement, the fiber is very thin and weak, so that sufficient pseudo-adhesiveness cannot be obtained. In the first place, when the fiber length is increased, even if the number of crimps and the crimp rate are reduced, fibers may be entangled during mixing to form a hair ball. On the other hand, when the thickness of the short fiber exceeds 50 denier, it is too thick and the entanglement becomes weak, which is uneconomical.

  Crimping of short fibers is a very important factor for improving productivity. Ordinary spun yarn has a crimp number of 20 to 25 and a crimp rate of 30 to 40%. In this embodiment, such a crimp number and crimp rate are mixed with a solidified material or soil. There is a risk that pills may form at times. In the present specification, the number of crimps and the crimp rate are values obtained based on JIS L 1015 and JIS L 1036. In this respect, the fibers that have been free from crimping (with 0 crimps) are economically hindered in the manufacturing process, and when the fibers are converged and applied to a cutter to obtain a fixed length of fibers, the productivity is remarkably impaired. It is difficult to use. In order to ensure practical productivity, it is necessary that the number of crimps is at least 2 and the crimp rate is 2% or more. These crimps can be adjusted, for example, by adjusting the spinning crimper.

  When the fiber length of the short fiber is less than 5 mm, the holding power (erosion preventing effect) of the fiber-mixed reinforcing soil layer 10 is lowered. In addition, even if the fiber length is 5 mm or more and less than 10 mm, the effect of preventing erosion can be exhibited for normal rainfall, but considering the response to heavy rain, the fiber length is preferably 10 mm or more. On the other hand, when the fiber length exceeds 30 mm, the dispersibility in the fiber-mixed reinforcing soil layer 10 decreases. However, by adjusting the number of crimps / crimp rate, if the fiber length is 50 mm or less, it can be evenly dispersed in the fiber-mixed reinforcing soil layer 10.

  In this embodiment, the type of the solidifying material is not particularly limited, and for example, a cement-based solidified material, a lime-based solidified material, a cement-lime-based solidified material, a gypsum-based solidified material, or the like can be used. Among these solidifying materials, cement-based solidifying materials are preferable from the viewpoint of immediate effect and economic efficiency.

Here, when short fibers and long fibers are not blended, the mixing amount of the cement-based solidifying material necessary for obtaining the erosion preventing effect of the reinforcing soil layer (10) is usually 3 to 7% by mass (50 to 120 kg / m). ³ ). However, the seed germination / growth is greatly affected by the pH of the soil and soil hardness. If a large amount of highly alkaline cement is added as described above, it becomes a major obstacle to the germination / growth of the plant. When the neutralizing agent is not used, the limit of the amount of cement-based solidifying material mixed is usually about 2% by mass. If more than this amount is mixed, the number of germinated seeds may be extremely reduced and the growth may be worsened.

  However, when fibers such as short fibers and long fibers are blended as in the present embodiment, the amount of cement-based solidification material mixed is 2.0% by mass or less, so there is no risk of seed germination / growth disturbance. However, when the mixing amount of the cement-based solidifying material is less than 0.3% by mass, the effect of mixing is almost obtained, and the erosion preventing effect depends on the fiber.

  By the way, when the slope G to be constructed is, for example, in a heavy rain region, a long slope, a steep slope, or a spring water station, solidification is especially performed to improve the erosion prevention effect. It is preferable to increase the mixing amount of the material. The amount of the solidifying material mixed is, for example, usually 0.1 to 10% by mass, preferably 0.1 to 1.0% by mass because the short fibers or the long fibers themselves have an erosion preventing effect. The amount of short fibers and long fibers mixed with the amount of solidified material can be appropriately determined on the basis of economy, plant growth, slope conditions, and the like, taking into consideration that there is an inversely proportional relationship.

On the other hand, the growth base material layer 20 of the present embodiment is a base for plants 90 such as seedlings and flowers, and the growth base material is air-conveyed from the tip of the spray nozzle by, for example, a known method. It can be formed on the fiber-mixed reinforcing soil layer 10 by spraying at a discharge pressure of ^{2 to} 15 kg / cm ² (0.2 to 1.5 MPa) and a spraying flow rate of 0.2 to 2.0 m ³ / min. .

The growth base material of this embodiment can be obtained by appropriately mixing seeds, wood chip compost, bark compost, peat moss, bonding agent, soil and the like.
Seeds include, for example, tall fescue, orchardgrass, red top, creeping, red fescue, kentucky bluegrass, bermudagrass, shiba, mugwort, clover, yamahagi, medhagi, weaselhagi, licorida, yashabushi, yamahanoki, false acacia, komatsunagi, etc. Can be used. From the standpoint of preventing growth disorders, it is preferable to use hagi because the hagi is strong against nitrogen starvation. In addition, since orchard glass, Bermuda glass, etc. are strong against drying, if the moisture content of the fiber-mixed reinforcing soil layer 10 or the growth base material layer 20 is likely to decrease due to the steep slope of the slope G, the water retaining material Etc. are preferably used.

Seeds can be blended, for example, in an amount of 0.1 to ³ kg, preferably 0.1 to 1.0 kg, with respect to 1 m ^{3 of} the growth base material.

  In this embodiment, in addition to the above, various materials can be mixed in the fiber-mixed reinforcing soil and growth base material. Specifically, for example, from the viewpoint of improving moisture retention, for example, a water-absorbing polymer can be mixed.

By the way, the slope greening method according to the present embodiment has a plurality of rigid strip-shaped plate materials 30 having a large number of liquid permeation holes arranged so as to satisfy the following conditions prior to the formation of the fiber-mixed reinforcing soil layer 10. Accordingly, the formation thickness 10X of the fiber-mixed reinforcing soil layer 10 is made uniform from the base portion 11 to the top end portion 12.
〔conditions〕
As shown in FIG. 2, each of the plurality of strip-shaped plate materials 30 has one side edge portion 30 c fixed to the inclined surface G, and the surface of the strip-shaped plate material 30 with respect to the surface extending upward from the fixed portion (30 c) The standing angle 30R is 10 to 90 °, preferably 30 to 90 °. Also, as shown in FIG. 3, at any position in the horizontal direction when the fiber-mixed reinforcing soil layer 10 is viewed from the front (see FIG. 2), the liquid flow line from the top end 12 to the base 11 is It arrange | positions so that it may cross | intersect at least any one of the several strip | belt-shaped board | plate material 30 (In the example of FIG. 3, the strip | belt-shaped board | plate materials 31-33). That is, when the belt-like plate member 32 and the belt-like plate member 33 adjacent to each other are taken as an example, the belt-like plate member 33 side edge of the belt-like plate member 32 and the belt-like plate member 32 side edge of the belt-like plate member 33 coincide or overlap with each other in the horizontal direction. It arrange | positions so that the range 30W may exist.

  In this regard, as described above, if the slope G has a steep slope exceeding 60 °, it exceeds the growth limit slope of the plant, so conventionally, the formation thickness 10X of the fiber-mixed reinforcing soil layer 10 is For example, the base portion 11 has a formed thickness 11X of 100 to 150 cm, and the top end portion 12 has a formed thickness 12X of, for example, 20 to 50 cm (that is, the formed thickness 11X on the base portion 11 side is reduced). Gradient correction was performed by making it thicker than the formation thickness 12X on the top end 12 side. Therefore, for example, when the slope beside the track in the railroad industry is a greening target slope, the interval between the greening target slope G and the track is narrow, and the formation thickness 11X of the base portion 11 of the fiber-mixed reinforcing soil layer 10 is increased. When it was not possible to correct the slope, it was extremely difficult to achieve permanent greening. However, since the slope greening method of this embodiment makes the formation thickness 10X of the fiber-mixed reinforcing soil layer 10 uniform from the base portion 11 to the top end portion 12, such a problem does not occur. The formation thickness 20X of the growth base material layer 20 is usually 3 to 10 cm.

  In addition, when the formation thickness 10X is made uniform in this way, when the slope of the slope G exceeds the growth limit slope, moisture is not retained in the fiber-mixed reinforced soil layer 10 and permanent growth of the plant cannot be achieved. Was normal. However, in this embodiment, prior to the formation of the fiber-mixed reinforcing soil layer 10, a plurality of rigid strip-shaped plate members 30 having a large number of liquid-permeable holes are disposed so as to satisfy the above-described conditions. The flow of moisture in the soil layer 10 becomes slow, and as a result, the plant can grow permanently.

  However, if the standing angle 30R of the plurality of strip-shaped plate materials 30 is less than 10 °, the flow of moisture on the surface portion of the fiber-mixed reinforcing soil layer 10 (near the boundary with the growth base material layer 20) is also slowed down. This is not preferable because the width of the strip-shaped plate member 30 needs to be widened, leading to an increase in cost. Moreover, it is not preferable that the moisture in the fiber-mixed reinforced soil layer 10 is likely to gather at the bottom surface portion (near the boundary with the slope G) far from the plant.

  On the other hand, when the standing angle 30R exceeds 90 °, moisture in the fiber-mixed reinforced soil layer 10 tends to gather on the surface portion and the growth base material layer 20 tends to collapse, which is not preferable.

  Further, in this embodiment, at any position in the horizontal direction when the fiber-mixed reinforcing soil layer 10 is viewed from the front, the liquid flow line from the top end portion 12 to the base portion 11 has a plurality of strip-shaped plate members 30 ( In the example of FIG. 3, since the strip plate 30 is disposed so as to intersect with at least one of the strip plates 31 to 33), the above effects can be obtained with certainty. In the example of FIG. 3, the liquid flow line intersects the two of the belt-like plate material 32 and the belt-like plate material 33 in a range 30 W where the belt-like plate material 32 and the belt-like plate material 33 adjacent to each other overlap in the horizontal direction.

  In this embodiment, the overlapping range (30 W) in the horizontal direction of the strip-shaped plate members 30 adjacent to each other is not particularly limited, and for example, the inclination angle of the slope G, the properties of the fiber-mixed reinforcing soil layer 10, the material cost, and the like are taken into consideration. And it can design suitably.

  However, in disposing a plurality of strip-shaped plate members 30, it is preferable to dispose at least one of the plurality of strip-shaped plate members 30, for example, eight out of ten so as to be continuous in the horizontal direction. In particular, a plurality of strip-shaped plate members 30 that are continuous in the horizontal direction, a pair of adjacent strip-shaped plate materials are symmetrically sandwiched between the adjacent portions, and each strip-shaped member is 45 to 60 ° with respect to the horizontal direction, preferably Is preferably arranged so as to be inclined at 50 to 60 °. Specifically, in the example of FIG. 4, five strips 34 to 38 are connected in the horizontal direction, and a pair of strips 34 and strips 35, strips 35 and strips 36, strips adjacent to each other are formed. The plate material 36 and the belt-like plate material 37, and the belt-like plate material 37 and the belt-like plate material 38 are symmetrical with respect to each adjacent portion, and the arrangement angle 30L of the belt-like members 34 to 38 with respect to the horizontal direction is 45 to 60 °. It is arranged to become.

  When the plurality of strip-shaped plate members 30 are arranged so as to be continuous in the horizontal direction, the top end portion 12 to the base portion 11 at any position in the horizontal direction when the fiber-mixed reinforcing soil layer 10 is viewed from the front. Since the flowing liquid flow line intersects at least one of the plurality of strip-shaped plate materials 30 (in the example of FIG. 4, the strip-shaped plate materials 34 to 38), the effect that the flow of moisture in the fiber-mixed reinforced soil layer 10 becomes slow, It is definitely obtained. Moreover, since a pair of mutually adjacent strip | belt-shaped board | plate materials 34,35 ... are arrange | positioned symmetrically on both sides of the said adjacent part, the water | moisture content in the fiber mixing reinforcement | strengthening soil layer 10 is disperse | distributed uniformly regarding a horizontal direction and an up-down direction. And it comes to be held.

  In this embodiment, how the strip-shaped plate members 34 to 38 are adjacent to each other is not particularly limited. For example, even if the side edge portions fixed to the inclined surface G are in contact with each other like the adjacent portions 30a of the belt-like plate material 35 and the belt-like plate material 36 shown in FIG. In addition, as in the adjacent portion 30b of the belt-shaped plate member 37, the other side edge portions standing from the inclined surface G may be in contact with each other. Of course, both longitudinal ends of the strip-shaped plate 30 can be appropriately processed so that the longitudinal ends of the strip-shaped strip 30 adjacent to each other are in contact with each other. However, since the moisture in the fiber-mixed reinforced soil layer 10 tends to collect on the bottom surface (near the boundary with the slope G), at least on the slope G, as in the adjacent portion 30a of the strip plate 35 and the strip plate 36. It is preferable that the side edges fixed to each other are in contact with each other.

  In this embodiment, as shown in FIGS. 5A to 5C, the strip-shaped plate member 30 has a large number of liquid-permeable holes 30H, 30H... And has rigidity. As the belt-like member 30, for example, as shown in FIG. 5A, a net-like member formed by weaving a large number of wire rods 30A, 30A... An expanded metal formed by forming a slit in the plate-like member 30B and opening the slit, as shown in FIG. The formed punching metal etc. can be illustrated. However, according to the net-like member formed by weaving a large number of wires 30A, 30A. To preferred.

  In this embodiment, the belt-like plate material 30 is not particularly limited as long as it has rigidity, and may be formed from, for example, a metal such as iron, aluminum, or stainless steel, or a resin such as polypropylene or polyethylene. it can. Moreover, the width | variety and length of the strip | belt-shaped board | plate material 30 are not specifically limited, either, When the formation thickness of the fiber mixing reinforcement | strengthening earth layer 10 shall be 20-100cm, width 20-100cm, length 50-200cm, Preferably width The length can be 20 to 30 cm and the length can be 50 to 100 cm.

  On the other hand, the strip-shaped plate member 30 of this embodiment allows the moisture in the fiber-mixed reinforcing soil layer 10 to move in the liquid flow direction through the liquid permeation holes 30H, 30H. In other parts, the moisture in the fiber-mixed reinforcing soil layer 10 is prevented from moving in the liquid flow direction, so that the moisture in the fiber-mixed reinforcing soil layer 10 is retained. Therefore, it is necessary to appropriately design the area ratio of the liquid permeable holes 30H, 30H... With respect to the entire surface of the band-shaped plate material 30 in consideration of the number and arrangement of the band-shaped plate materials 30, and this area ratio is usually 10 to 90%. , Preferably 50 to 80%. If the area ratio is too small, the moisture in the fiber-mixed reinforced soil layer 10 is likely to flow along the strip-shaped plate material 30. On the other hand, if the area ratio is too large, the moisture flow in the fiber-mixed reinforced soil layer 10 is too high. There is a risk that it will be insufficient to slow down.

  The present invention can be applied as a slope greening method and a slope greening structure suitable particularly when the slope has a steep slope exceeding 60 °.

It is a model perspective view of the slope greening structure of this form. It is a schematic cross section of the slope greening structure of this form. It is the example of arrangement | positioning of the strip | belt-shaped board | plate material of this form. It is the example of arrangement | positioning of the strip | belt-shaped board | plate material of this form. It is a form example of the strip | belt-shaped board | plate material of this form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Slope greening structure, 10 ... Fiber mixing reinforcement | strengthening soil layer, 11 ... Base part, 12 ... Top end part, 20 ... Growth base material layer, 30 ... Strip | belt board material, 90 ... Plant, G ... Slope.

Claims (4)

A method of constructing a fiber-mixed reinforcing soil layer on a slope, covering the fiber-mixed reinforcing soil layer with a growth base material, and greening the slope,
Prior to the formation of the fiber-mixed reinforced soil layer, a plurality of rigid strip-shaped plate materials having a large number of liquid-permeable holes are disposed so as to satisfy the following conditions:
The formation thickness of the fiber-mixed reinforcing soil layer is uniform from the base portion to the top end portion,
Slope greening method characterized by that.
〔conditions〕
The plurality of strip-shaped plate members are arranged such that one side edge portion is fixed to the slope, and an upstanding angle with respect to a surface from the fixed portion toward the upper side of the slope is 10 to 90 °, and At any position in the horizontal direction when the fiber-mixed reinforcing soil layer is viewed from the front, the liquid flow line from the top end portion to the base portion is arranged so as to intersect with at least one of the plurality of strip-shaped plate members. To do.   The slope greening method according to claim 1, wherein at least one of the plurality of strip-shaped plate members is disposed so as to be continuous in the horizontal direction.   The plurality of strip-shaped plate members that are continuous in the horizontal direction are configured such that a pair of adjacent strip-shaped plate materials are symmetrically sandwiched between the adjacent portions, and each strip-shaped member is inclined by 45 to 60 ° with respect to the horizontal direction. The slope greening method according to claim 2, which is disposed in A greening structure of the slope in which a fiber-mixed reinforced soil layer is formed on a slope, and the fiber-mixed reinforced soil layer is covered with a growth base material,
A plurality of rigid strip-shaped plate materials having a large number of liquid-permeable holes are disposed on the slope so as to satisfy the following conditions:
The formation thickness of the fiber-mixed reinforcing soil layer is uniform from the base to the top end,
Slope greening structure characterized by that.
〔conditions〕
Each of the plurality of strip-shaped plate members is arranged such that one side edge portion is fixed to the inclined surface, and an upstanding angle with respect to a surface from the fixed portion toward the upper side of the inclined surface is 10 to 90 °, and the fiber At any position in the horizontal direction when the mixed reinforcing soil layer is viewed from the front, the liquid flow line from the top end portion to the base portion is arranged so as to intersect with at least one of the plurality of strip-shaped plate members. Yes.

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