Slope protection tool

Abstract

To provide a slope protection tool and a slope protection method capable of obtaining a berm effect favorably and reliably.SOLUTION: A slope protection tool 1 comprises a hardening bag 3 containing a hardening material 3b that hardens by absorbing water or moisture, and a vegetative substrate. The vegetative substrate may constitute a substrate 4b contained in a substrate bag 4 separate from the hardening bag 3, or may be attached to the lower surface of a sheet-like member provided below a net-like member 2 that is sandwiched between the hardening bag 3 and the slope.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a slope protection device for protecting a slope such as a slope. method Regarding. [Background technology]

[0002] A slope protection work is known in which a slope protection device consisting of a bag-shaped body containing a base material together with vegetation seeds (seeds of plants for greening) and a net-shaped member to which multiple bags are attached is installed on a slope (slope) (Patent Document 1).

[0003] In this slope protection work, the accumulated runoff soil and sand by the bag-shaped body, as well as the surrounding leaves, form a vegetation base in the form of small steps on the mountain side of the bag-shaped body, and the so-called berm effect, which makes it easy for plants to grow on these berms, enables early and successful greening. In other words, the berm effect referred to here is the effect that the accumulation of soil and sand forms a growth base layer with a gentler gradient than the slope, forming small steps, making it easy for plants to grow on these berms.

[0004] However, the base material in the bag-shaped body used in this slope protection work is mainly composed of organic matter and vermiculite, and over time the organic matter is consumed and the vermiculite shrinks, and depending on the construction environment, the base material may be significantly reduced in thickness. In this case, as a result of this reduction, the vegetation base that constitutes the berm is washed away and slides down from the gap that appears between the slope and the bag-shaped body of the slope protection equipment installed on the slope, or from the upper side of the bag-shaped body, and the vegetation base is no longer formed on the mountain side of the bag-shaped body, resulting in the problem that the berm effect is not obtained.

[0005] Therefore, it is conceivable to incorporate a hardening material that hardens by absorbing water into the base material or the bag-like body. If the hardening material hardens due to rainfall or the like, the shape of the bag-like body will be maintained, so that the loss of the berm effect can be prevented. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2007-56606 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, there is a possibility that the above-mentioned conventional slope protection tools may not provide a sufficient berm effect.

[0008] The present invention has been made in consideration of the above matters, and an object of the present invention is to provide a slope protection device capable of obtaining a berm effect well and reliably. method The purpose of this invention is to provide [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a slope protection method teeth, A method for protecting slopes, comprising laying a bag-shaped body on a slope such as an incline, the weight ratio of which is 80-160% when the amount of contents contained therein is taken as 100% when loosely packed, said bag-shaped body being provided with exposed lattice-shaped high-strength fibers extending in the longitudinal and circumferential directions on the outside of said bag-shaped body, and having a degree of flexibility that allows it to be stretched out in a state that follows the unevenness of the surface of the slope in the area to be greened, said bag-shaped body and a net-like, mat-like or sheet-like member without the bag-shaped body attached being separately laid on the slope and integrated with each other, and said bag-shaped body being fixed to the slope in a state where it is pierced by a plurality of fixing members, thereby providing a step effect. (Claim 1). Effect of the Invention

[0010] In the present invention, a slope protection system capable of obtaining a berm effect well and reliably is provided. method is obtained. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2A is a perspective view showing a schematic configuration of a slope protection equipment used in a slope protection method according to one embodiment of the present invention in an unfolded state, and FIG. 2B is an explanatory diagram showing a method of storing the slope protection equipment. [Diagram 2] FIG. 4 is an explanatory diagram illustrating a schematic configuration of a bag-shaped body of the mortar bag of the slope protection tool. [Diagram 3] 1A is a longitudinal cross-sectional view showing the slope protection equipment in an installed state, and FIG. 1B and FIG. 1C are explanatory views showing the changes in the state of the slope protection equipment installed on a slope. [Figure 4] 13(A) and 13(B) are explanatory views that show schematic configurations of a modified example of the bag-shaped body before and after formation. [Diagram 5] 13(A) and 13(B) are explanatory views that show schematic configurations of another modified example of the bag-shaped body before and after formation. [Figure 6] 13(A) and 13(B) are explanatory views each showing a schematic configuration of still another modified example of the bag-shaped body. [Figure 7] FIG. 11 is an explanatory diagram illustrating a schematic configuration of another modified example of the slope protection equipment. [Figure 8] 8(A) and 8(B) are explanatory diagrams illustrating schematic changes in state of the slope protection equipment of FIG. 7 laid on a slope. [Figure 9] 13(A) and 13(B) are explanatory views each showing a schematic configuration of a modified example of the slope protection equipment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

[0013] The slope protection method of this embodiment involves laying slope protection equipment 1 shown in Figure 1(A) on a slope N (see Figure 3(A)), which is an example of a slope, to protect and green the slope N.

[0014] As shown in FIG. 1(A), the slope protection equipment 1 comprises a net-like member 2 having a substantially rectangular shape, and a mortar bag 3 and a base material bag 4 held (attached) to this net-like member 2.

[0015] The net-like member 2 has the storage sections 5 at appropriate intervals in the longitudinal direction. Here, the net-like member 2 in this example is, for example, a member with a width of 1 m and a length of 5 to 10 m, and the storage sections 5 are provided at intervals of 30 cm in the longitudinal direction. That is, only a part of the net-like member 2 (slope protection equipment 1) is shown in FIG. 1(A). Then, each storage section 5 stores a mortar bag 3 or a base material bag 4 alone. In the example shown in FIG. 1(A) and FIG. 3(A), one out of three storage sections 5 stores a mortar bag 3, and the remaining storage sections 5 store base material bags 4. The storage section 5 is formed in a bag, tube, or pocket shape having a size large enough to store the mortar bag 3 or base material bag 4, and each bag 3, 4 is inserted into the storage section 5 from one end side, whereby each bag 3, 4 is held by the net-like member 2.

[0016] The net-like member 2 is made of durable fibers (such as nylon, polyester, aramid, carbon, glass, polyacetal, etc.) or corrodible fibers (such as coconut fibers) with a mesh size of about 5 to 10 mm, and both of these (durable fibers and corrodible fibers) may be layered. Furthermore, to improve strength, the net-like member 2 may be layered with wire mesh (such as tortoiseshell wire mesh or lath wire mesh).

[0017] As shown in FIG. 1(A), the mortar bag 3 is a bag-shaped body 3a having a long and narrow cylindrical shape with both ends closed and permeable to water or moisture, and contains dry mortar (one example of a hardening material) 3b that hardens by absorbing water. Since the bag-shaped body 3a does not contain any material that generates voids (such as a base material that loses weight over time due to the elution of fertilizer components), it can be made strong. The dry mortar 3b in this example is made by mixing granular sand as aggregate with cement, but the aggregate constituting the dry mortar 3b is not limited to sand, and vermiculite, perlite (pumice), etc. can be used. The bag-shaped body 3a can be made to have high strength by storing only the hardening material that hardens by absorbing water or moisture, or by storing the hardening material mixed with only the aggregate. In addition, a reinforcing material such as steel fiber may be mixed with the dry mortar to improve the strength of the mortar bag 3 after hardening.

[0018] Here, the amount of the contents packed in the bag-shaped body 3a is set to 80 to 160% by weight when the amount of the contents packed is 100%. Rough packing means that the contents are naturally dropped into the bag-shaped body 3a to fill it, and is a method generally used when measuring the "loose bulk density". If the amount of the contents packed in the bag-shaped body 3a exceeds 160%, the strength is good, but the flexibility of the mortar bag 3 is lost and it becomes difficult to follow the slope N, and additional material costs are required. On the other hand, if the amount of the packing falls below 80%, the mortar bag 3 fits well to the slope N, but voids are generated in the bag-shaped body 3a, and the hardening material does not become integrated with the bag-shaped body 3a when hardening, so that a dense hardened body cannot be obtained and the strength is insufficient (see Table 1 below).

[0019] [Table 1]

[0020] For example, when using a material with a cement:sand ratio of 1:2 (by weight) as the dry mortar 3b, if the above-mentioned filling amount is set to about 128%, a mortar bag 3 that is extremely excellent in terms of both strength and conformability to the slope N will be obtained.

[0021] As shown in FIG. 2, the bag-like body 3a constituting the mortar bag 3 has a double structure consisting of an inner bag body 6 and an outer bag body 7, and a sheet-like high-strength fiber 8 is disposed between these two bags 6, 7 to increase the strength of the bag-like body 3a in the longitudinal direction. Here, the high-strength fiber 8 is used at least in the longitudinal direction of the bag-like body 3a, and the strength of the bag-like body 3a in the longitudinal direction is increased by the high-strength fiber 8. The high-strength fiber 8 may be bonded (for example, by heat fusion or adhesion) or connected (for example, by sewing) to either one or both of the bags 6, 7, or may simply be inserted between the two bags 6, 7. On the other hand, the inner bag body 6 may simply be inserted into the outer bag body 7, or may be bonded or connected, for example, directly to the outer bag body 7 or indirectly via the high-strength fiber 8 to the outer bag body 7. In the case where the inner bag body 6 is simply inserted into the outer bag body 7, for example, after the dry mortar 3b is placed in the inner bag body 6, the outer bag body 7 may be placed over the outside of the inner bag body 6.

[0022] Here, the bag bodies 6, 7 can be formed using a sheet-like body that is impermeable to the dry mortar 3b and has water permeability or moisture permeability, and examples of the material include nonwoven fabric, felt, cloth (woven fabric), knitted fabric, jute cloth, water-degradable plastic, thin cotton, etc.

[0023] The material for the high-strength fibers 8 may be synthetic fibers such as polyethylene, polyester, nylon, vinylon, etc., which are manufactured to have high strength for industrial use, or high-strength glass fibers, carbon fibers, aramid fibers, etc.

[0024] The substrate bag 4 is a bag-like body 4a having a long and narrow cylindrical shape with both ends closed, and the substrate 4b is accommodated in the bag-like body 4a. The bag-like body 4a can be formed using a sheet-like body having water permeability or moisture permeability without passing through the substrate 4b, and the same material as the bags 6 and 7 can be used for the material. The substrate 4b may be a vegetation substrate containing a suitable material selected from, for example, the seeds of greening plants (vegetation seeds), growth aids (water-retaining materials, fertilizers, etc.), or soil improvement materials, or may be other normal substrates, or may be a mixture of a vegetation substrate and a normal substrate. The vegetation substrate may be, for example, a substrate containing vegetation seeds mainly composed of vermiculite, or a topsoil seed bank, specifically, a substrate containing vegetation seeds from natural ground or forests near the slope protection target area (greening target area) appropriately mixed with growth aids such as peat moss, bark compost, and water-retaining materials. In this case, plants can be introduced reliably in stripes. In addition, examples of the normal substrate include substrates appropriately selected from materials that do not harm vegetation, such as wood chips, agricultural and marine waste (seashells, crab shells, fruit waste, etc.), and paper sludge.

[0025] The slope protection method of this embodiment is completed by simply laying the slope protection tool 1 on the slope N as shown in FIG. 3(B). To lay the slope protection tool 1, the slope protection tool 1 may be fixed to the slope N by driving a fixing member 9 such as an anchor pin. It is also desirable to lay the slope protection tool 1 so that each bag 3, 4 is aligned with the contour line on the slope N, because this allows plants to take root in the soil piled up on the mountain side of each bag 3, 4, and provides the above-mentioned berm effect that allows for earlier and better greening, and is also desirable in terms of improving the landscape. In addition to being arranged on the contour line, the mortar bag 3 may be arranged perpendicular to the contour line and connected in a lattice shape by driving a fixing member 9 at the intersection (not shown). This allows for a construction method with a higher protection effect on the slope N.

[0026] The bags 3 and 4 of the slope protection equipment 1 laid on the slope N as described above are arranged by their own weight in a state where they fit closely to the slope N. In other words, the bags 3 and 4 have a degree of flexibility that allows them to be stretched along the slope N even if the slope N is uneven. The same applies to the net-like member 2.

[0027] Then, as shown in Fig. 3(B), the dry mortar 3b hardens as moisture is supplied to the mortar bag 3 by rainfall or the like. After the dry mortar 3b hardens in this way, the mortar bag 3 maintains its shape, and thus the mortar bag 3 is kept in close contact with the slope N, so that as shown in Fig. 3(C), the runoff soil and sand accumulate on the mountain side of the mortar bag 3, forming a vegetation base 10 and providing the above-mentioned berm effect. In this example, the amount of contents to be filled into the bag-shaped body 3a is taken into consideration as described above, so that the berm effect can be obtained well and reliably.

[0028] In particular, when the fixing members 9 are cast, one mortar bag 3 is set in a state in which multiple fixing members 9 are pierced, so that after the dry mortar 3b hardens, the mortar bag 3 is firmly connected to the head of the fixing member 9 to form an integrated structure, and the net-like member 2 is reinforced in both the vertical and horizontal directions. In this case, the protection effect against deer trampling is also improved. Here, the net-like member 2 in this example is obtained by raschel knitting (chain knitting), and the strength in the horizontal direction is inferior to the strength in the vertical direction, so that it is easy to shift (stretch) in the horizontal direction. However, this strength in the horizontal direction is significantly reinforced by the mortar bag 3 after the dry mortar 3b hardens, and by firmly holding the slope N with the mortar bag 3, the stretchability of the net-like member 2 is limited, and the protection function of the surface layer of the slope N is also improved. In other words, by simply deploying the slope protection tool 1 and fixing it with the fixing members 9, the initial movement of the falling of boulders on the slope N can be effectively suppressed, and small collapses caused by it can be prevented. Therefore, the slope protection device 1 is suitable for use on slopes N prone to collapse by small rock falls or slopes N prone to erosion, and also helps to suppress frost heave on the slopes N, making the slope protection method of this embodiment applicable as foundation work for greening (slope protection).

[0029] By implementing the slope protection method of laying the slope protection tool 1 on the slope N as described above, the vegetation seeds in the base material 4b contained in the base material bag 4 germinate and grow, allowing for more active greening. Even if the slope protection tool 1 does not contain plant seeds, the vegetation base 10 formed in a stepped shape on the mountain side of the mortar bag 3 can effectively capture seeds that fly in from the surrounding vegetation, causing the plants to germinate and grow. This ensures that the slope N is covered with greenery over almost the entire surface.

[0030] Moreover, the mortar formed by the dry mortar 3b in the mortar bag 3 has a high compressive strength but a low bending strength, which means that the hardened mortar is prone to cracking, but the high-strength fibers 8 that increase the strength of the bag-shaped body 3a make the mortar less likely to crack. Even if the bag-shaped body 3a of the mortar bag 3 is too thick for water to penetrate sufficiently into the bag-shaped body 3a or the amount of water supplied to the mortar bag 3 is too small and the dry mortar 3b does not harden sufficiently, the bag-shaped body 3a can still retain its shape thanks to the high-strength fibers 8.

[0031] In addition, in the slope protection equipment 1 of this example, the high-strength fibers 8 are sandwiched between the inner bag body 6 and the outer bag body 7 in the bag-shaped body 3a of the mortar bag 3, so that it is possible to prevent the high-strength fibers 8 from peeling off when dry mortar 3b is placed in the mortar bag 3. In addition, the formation of space within the three-layer structure of the bag-shaped body 3a improves the moisture retention performance, and it is expected that the curing effect of the mortar will be improved (increased strength).

[0032] Incidentally, if the dry mortar 3b has absorbed moisture and hardened before the slope protection tool 1 is laid on the slope N, there is a possibility that the bag-like body 3a will not adhere closely to the unevenness of the slope N after laying on the slope N, and a sufficient berm effect will not be obtained. Therefore, in the slope protection tool 1 of this embodiment, as shown in Fig. 1(A) and Fig. 3(A), a moisture absorption bag (drying bag) 13 containing a desiccant and having water or moisture permeability is attached to the net-like body 2. Specifically, a storage section 5a having a structure similar to that of the storage section 5 is provided in the net-like body 2, and the moisture absorption bag 13 is stored in this storage section 5a.

[0033] Possible desiccants to be stored in the moisture absorbing bag 13 include quicklime, silica gel, clay minerals such as bentonite, and calcium chloride. Each of these desiccants has its own characteristics, so they are usually used alone, but they may also be used in combination.

[0034] At least one moisture absorbing bag 13 may be attached to one slope protection equipment 1 (net-like body 2). In the illustrated example, the moisture absorbing bag 13 is attached to the end portion of the slope protection equipment 1 (net-like body 2), but the attachment position is not limited thereto and may be the center of the slope protection equipment 1 (net-like body 2), etc.

[0035] The moisture absorption bag 13 may be an elongated tubular bag with both ends closed, similar to the mortar bag 3 and vegetation bag 4, with a length approximately equal to the width of the net-like body 2 (the length of the storage section 5a); however, if the moisture absorption bag 13 is made into a single elongated bag, uneven distribution of the desiccant contained therein becomes an issue. In this embodiment, therefore, in order to prevent or reduce uneven distribution of the desiccant, a desiccant is contained in each of a number of small bags (for example, about 10 bags) connected in a strip shape. The amount of desiccant used is 10 to 120 g / m, taking quicklime as an example. 2 , preferably 20 to 40 g / m 2 In this case, quicklime can be divided into small bags (bag length 8 to 10 cm) and stored in amounts of 15 g each.

[0036] The slope protection tool 1 of this example is usually stored and distributed in a rolled state as shown in Fig. 1(B) until it is laid on the slope N, and the hardening of the dry mortar 3b is suppressed to some extent by the attachment of the moisture absorbing bag 13 until the slope protection tool 1 is laid on the slope N. However, in order to prevent further hardening of the dry mortar 3b, it is preferable to prevent the slope protection tool 1 from contacting the outside air containing moisture and humidity as much as possible before laying on the slope N. For example, it is considered to pack the slope protection tool 1 in a moisture-proof film such as an aluminum vapor deposition film or a silica vapor deposition film that has a high moisture-proof effect, and a moisture-proof film (thickness 120 μm) laminated with nylon or the like is relatively inexpensive and has excellent usability.

[0037] Furthermore, as shown in FIG. 1(B), if the slope protection equipment 1 is placed in a sealed bag 14 formed from these moisture-proof films, and the opening of the sealed bag 14 is sealed by heat sealing or the like after removing as much air as possible, the bag-shaped body 3a (mortar 3) containing the dry mortar 3b and the moisture absorption bag 13 will be vacuum-packed.

[0038] If a desiccant is not used as described above, the dry mortar 3b may harden within one month, but if the moisture absorption bag 13 is used and vacuum-packed as described above, the dry mortar 3b can remain unhardened for more than six months.

[0039] Generally, desiccants are discarded after they have fulfilled their purpose, but in this example, the moisture absorbing bag 13 containing the desiccant is attached to the net-like body 2 and laid on the slope N. When quicklime is used as the desiccant, it has the effect of adjusting the soil pH and supplying calcium, a nutrient. Silica gel supplies silicon, which is expected to have an effect of suppressing lodging of grasses. Furthermore, clay minerals such as bentonite have fertility retention in addition to water retention, so they are expected to have the effect of retaining fertilizer that would otherwise be washed away. Furthermore, not discarding the moisture absorbing bag 13 containing the desiccant also has the advantage of not generating waste at the construction site.

[0040] Moreover, when packing the slope protection device 1, if it is vacuum-packed, the volume of the slope protection device 1 itself will be reduced by evacuating the air, so that the transportation cost can be reduced and the storage space can be made more compact. Due to the hardening associated with vacuum packing, it is difficult for the load to collapse during transportation, etc., and the effect of being easy to carry can also be obtained.

[0041] It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, the following modification examples can be cited.

[0042] When implementing the slope protection method, the slope protection device 1 that has been integrated in advance may be laid on the slope surface N. However, for example, after arranging the slope protection device 1 in a state where the bags 3, 4, and 13 are not attached on the slope surface N, the bags 3, 4, and 13 may be inserted into the accommodating portions 5 and 5a. In this case, the slope protection device 1 is lightened, and the transportation to the slope surface N can be carried out with a small number of people.

[0043] Also, the bags 3, 4, and 13 are not limited to being in the shape of long and narrow bags as shown in Fig. 1(A). For example, they may be in the shape of bags with substantially the same vertical and horizontal ratios. In this case, the configuration of the accommodating portions 5 and 5a of the net-like member 2 that holds the bags 3, 4, and 13 may be appropriately changed according to the bags 3, 4, and 13.

[0044] A sheet-like member (not shown) formed using a biodegradable material, a soluble material, or a hydrolyzable material such as spunbonded nonwoven fabric, pulp fiber, or synthetic resin may be provided by appropriate means such as adhesion below the net-like member 2 and configured to allow water and plant buds and roots to pass through. In this case, it is desirable to adhere a vegetation base material appropriately selected from vegetation seeds, fertilizers, soil improvement materials, water retention materials, etc. to the lower surface of the sheet-like member with a water-soluble adhesive material so that the sheet-like member is configured to carry the vegetation base material. The sheet-like member can also be formed by thinly stretching rayon-made nonwoven fabric.

[0045] The sheet-like member and the net-like member 2 may be directly fixed by adhesion or the like, but for example, the sheet-like member and the net-like member 2 may be arranged in a stacked state on the slope N, and then fixing members 9 such as anchor pins may be driven in to lay both of them on the slope N.

[0046] In addition, the member to which the bags 3, 4, 13 are attached is not limited to the net-like member 2, but may be a mat-like or sheet-like member. Also, by using the net-like member 2 or the like, the installation of the bags 3, 4, 13 can be simplified, but the present invention is not limited to this, and only the bags 3, 4, 13 may be installed.

[0047] 1(A) and 3(A), a storage section 5a for storing the moisture absorption bag 13 is provided separately from the storage section 5, but this is not limiting, and the moisture absorption bag 13 may be stored in the storage section 5 without providing the storage section 5a. Also, the net-like member 2 shown in FIG. 1(A) is provided with storage sections 5, 5a, but the storage sections 5, 5a may not be provided and, for example, the bags 3, 4, 13 may be tied to the net-like member 2 with ropes, wires, or the like.

[0048] The slope protection method performed by laying the slope protection tool 1 is suitable for application on slopes, and although slope N is one example of a slope, it goes without saying that the slope protection method may also be applied on flat ground, etc. However, the slope protection method is more suitable for application on slope N in terms of obtaining the berm effect, etc.

[0049] In the example shown in Figure 1 (A), a mortar bag 3 is stored in one of every three storage sections 5, and a base material bag 4 is stored in the remaining storage section 5, but this is not limited to this. The ratio of storing the mortar bag 3 and the base material bag 4 can be changed as appropriate, for example, a mortar bag 3 can be stored in one of every two storage sections 5 and a base material bag 4 can be stored in the remaining storage section 5, or mortar bags 3 can be stored in all storage sections 5 without using a base material bag 4.

[0050] In the above embodiment, a mortar bag 3 containing dry mortar 3b in a bag-shaped body 3a is used, but this is not limited to the above. For example, a bag (hardening bag) containing other hardening materials such as cement-based materials such as dry cement that does not contain aggregate or gypsum in a bag-shaped body 3a may be used instead of the mortar bag 3.

[0051] The bag-like body 3a shown in FIG. 2 has a three-layer structure, but is not limited to this. For example, the inner bag body 6 may be eliminated so that the high-strength fibers 8 are exposed on the inside of the bag-like body 3a, or conversely, the outer bag body 7 may be eliminated so that the high-strength fibers 8 are exposed on the outside of the bag-like body 3a.

[0052] A core material such as an iron wire or a high-strength fiber rope may be arranged in the longitudinal direction inside the mortar bag 3 while maintaining the center with a spacer such as a lantern spacer (not shown). This makes it possible to make the mortar bag 3 stronger, and after the slope protection tool 1 is laid on the slope N, until the dry mortar 3b in the mortar bag 3 hardens and after it has hardened, the bag-shaped body 3a may be able to maintain a good state of fitting along the slope N.

[0053] In the bag-like body 3a of the mortar bag 3 shown in FIG. 2, the high-strength fibers 8 are provided in a tubular or bag-like shape covering the outer surface of the inner bag 6 and the entire inner surface of the outer bag 7, but the high-strength fibers 8 are not limited to this, and may be configured to increase the strength of the bag-like body 3a in the longitudinal direction. Therefore, for example, as shown in FIG. 4(A), the high-strength fibers 8 may be fixed in stripes to the sheet-like outer bag 7, and as shown in FIG. 4(B), the outer bag 7 may be rolled into a cylindrical shape so that the high-strength fibers 8 are on the inside, and the edges may be closed to form the bag-like body 3a. The inner bag 6 may be provided during this formation process, or the high-strength fibers 8 may be provided on the inner bag 6 instead of the outer bag 7, and the inner bag 6 may be rolled into a cylindrical shape so that the high-strength fibers 8 are on the outside. In any case, in the bag-like body 3a after formation, the high-strength fibers 8 have a portion extending in the longitudinal direction of the bag-like body 3a, so that the strength of the bag-like body 3a in the longitudinal direction is increased.

[0054] In addition, in the modified example shown in Figures 4(A) and (B), the high-strength fibers 8 only have a portion extending in the longitudinal direction of the bag-shaped body 3a, but they may also have a portion extending in the circumferential direction of the bag-shaped body 3a.As one example, the high-strength fibers 8 may be formed in a lattice pattern, as shown in Figures 5(A) and (B).

[0055] Furthermore, the high-strength fibers 8 can be arranged in a variety of ways as long as the longitudinal strength of the bag-like body 3a can be increased. For example, as shown in FIG. 6(A), the high-strength fibers 8 may be arranged so as to pass along the diagonal of the rectangular inner bag body 6 or outer bag body 7, or the high-strength fibers 8 may be arranged so as to extend in a spiral shape when the inner bag body 6 or outer bag body 7 is rolled into a cylindrical shape (see FIG. 6(B)).

[0056] When mortar flows out of the mortar bag 3 due to the supply of moisture to the mortar bag 3 by rainfall or the like, this mortar is alkaline and may have a detrimental effect on some vegetation. Considering that mortar flows out mainly to the valley side of the mortar bag 3, a neutralizing bag 11 may be placed on the valley side of the mortar bag 3 as shown in Figures 7, 8(A) and (B), thereby suppressing the detrimental effect on vegetation due to mortar flow. In order to reliably obtain such an effect, when laying the slope protection equipment 1 on the slope N, it is preferable to place the slope protection equipment 1 so that the neutralizing bag 11 is located on the valley side of the mortar bag 3.

[0057] The neutralization bag 11 contains an alkali neutralizer 11b in a bag-like body 11a having a long, narrow cylindrical shape with both ends closed. The bag-like body 11a can be formed using a water-permeable or moisture-permeable sheet-like body that does not allow the alkali neutralizer 11b to pass through, and the same material as the bags 6 and 7 can be used for the bag-like body 11a. For example, peat moss (acidic) or a carbon material treated with an acid (for example, a material obtained by contacting hydrochloric acid with a carbonized product of a plant body that has been carbonized after being contacted with a solution containing calcium chloride) can be used for the alkali neutralizer 11b.

[0058] In the example shown in Figures 7, 8(A) and (B), a mortar bag 3 and a neutralizing bag 11 are stored in a pair in the storage section 5, and the neutralizing bag 11 to prevent mortar leakage is placed only on the valley side of the mortar bag 3, but this is not limited to the above, and the neutralizing bag 11 may also be placed on the mountain side of the mortar bag 3, and the alkaline neutralizing agent 11b may be placed around the mortar bag 3 in a form other than the neutralizing bag 11.

[0059] In order to promote germination and growth of plants in a vegetation base 10 (see FIG. 3(C)) formed on the mountain side of the mortar bag 3, a fertilizer bag 12 may be placed on the mountain side of the mortar bag 3 as shown in FIG. 9(A). In the illustrated example, the mortar bag 3 and the fertilizer bag 12 are stored as a pair in one storage section 5. In this case, a base material bag 4 can be used instead of the fertilizer bag 12. Note that the fertilizer bag 12 can be, for example, a base material bag 4 specialized for storing fertilizer.

[0060] Also, the mortar bag 3, the neutralizing bag 11, and the base material bag 4 (or the fertilizer bag 12) may be accommodated in one accommodation section 5. In this case, it is preferable to arrange the neutralizing bag 11 on the valley side of the mortar bag 3 and the base material bag 4 (or the fertilizer bag 12) on the mountain side.

[0061] 7, 8(A) and 8(B), the mortar bag 3 and the neutralization bag 11 are stored in one storage section 5, but the present invention is not limited to this. For example, as shown in FIG. 9(B), a plurality of storage sections 5 may be provided in series in the net-like member 2, and the mortar bag 3 and the neutralization bag 11 may be stored in each storage section 5. This also applies to the case where a fertilizer bag 12 is used instead of or in addition to the neutralization bag 11.

[0062] In the example shown in Figures 8(A) and (B), when the slope protection equipment 1 is laid on the slope N, the mortar bag 3 and the neutralization bag 11 stored as a pair in one storage section 5 are individually pierced with the fixing member 9, but of the mortar bag 3 and the neutralization bag 11, only the mortar bag 3 on the mountain side may be pierced and fixed with the fixing member 9. Note that, as shown in Figures 3(B) and (C), the mortar bag 3 stored alone in the storage section 5 is pierced individually with the fixing member 9 and fixed to the slope N, and the base material bag 4 is fixed in the same manner.

[0063] It goes without saying that the above modifications may be combined as appropriate.

[0064] Furthermore, in each of the above examples, the strength of the bag-shaped body 3a in the longitudinal direction is increased by the high-strength fibers 8, but such high-strength fibers 8 do not necessarily have to be used. [Explanation of symbols]

[0065] 1 Slope protection equipment 2. Net-like member 3 Mortar Bag 3a pouch-like body 3b Dry mortar 4 Base material bag 4a pouch-like body 4b Base material 5. Storage section 5a Storage section 6 Inner bag 7 Outer bag 8 High-strength fibers 9 Fixing member 10 Vegetation Base 11 Neutralization bag 11a Bag-like body 11b Alkaline neutralizer 12 Fertilizer bag 13 Moisture absorption bag N Slope

Claims

[Claim 1] A method for protecting a slope, comprising laying a bag-shaped body on a slope such as a sloping surface, the bag-shaped body having a weight ratio of 80 to 160% of the weight of the contents contained therein when the contents are loosely packed, taken as 100%, the weight ratio being 80 to 160% of the weight of the contents contained therein, The bag-shaped body is provided with a lattice-shaped high-strength fiber extending in the longitudinal direction and the circumferential direction exposed on the outside of the bag body, and has a flexibility to such an extent that it can be stretched in a state that follows the unevenness of the surface of the slope of the greening target area, The bag-like body and the net-like, mat-like or sheet-like member without the bag-like body are separately laid on the slope and integrated with each other, A slope protection method characterized in that a bag-shaped body is fixed to a slope in a state in which it is penetrated by a plurality of fixing members, thereby achieving a berm effect.

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