Slope protection method

Abstract

To provide a slope protection method capable of excellently and surely obtaining a small step effect.SOLUTION: A slope protection method for laying a bag-shaped body side 3a on a slope such as a slope surface N, the bag-shaped body side wall having a filling amount of a content to be stored therein of 80 to 160% by weight ratio when the filling amount in rough filling is 100%, the slope protection method comprising: The bag-shaped body is provided with lattice-shaped high-strength fibers 8 extending in a longitudinal direction and a circumferential direction in an exposed state on an outer side of the bag-shaped body, and has flexibility to such an extent that the bag-shaped body can be stretched along irregularities of a surface of a slope of a greening target ground, the bag-shaped body and the net-shaped, mat-shaped, or sheet-shaped member 2 in a state in which the bag-shaped body is not mounted are integrated in advance before being laid on the slope, and the bag-shaped body is fixed to the slope in a state of being penetrated by a plurality of fixing members 9, thereby obtaining a small step effect.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a slope protection method for protecting a slope such as a slope. [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 (inclined surface) (Patent Document 1).

[0003] In this slope protection work, the accumulated soil and sand runoff by the bag-shaped body, as well as leaves from the surrounding areas, form a vegetation base in the form of small steps on the mountain side of the bag-shaped body, and this 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 here refers to the effect whereby the accumulation of soil and sand forms a growth base layer in the form of small steps that are gentler than the slope, making it easy for plants to grow on these berms.

[0004] However, the base material inside the bags used in this slope protection work is primarily composed of organic matter and vermiculite, and over time the organic matter is consumed and the vermiculite shrinks, which can cause the base material to shrink significantly depending on the construction environment. In this case, as a result of this loss, the vegetation base that makes up the berms can be washed away or slide down from the gaps that form between the slope and the bags of the slope protection equipment installed on the slope, or from the top of the bags, preventing the formation of a vegetation base on the mountain side of the bags, and as a result, the berm's effectiveness cannot be achieved.

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

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-56606 Summary of the Invention [Problem to be solved by the invention]

[0007] However, there is a possibility that the above-mentioned conventional slope protection equipment may not be able to 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 method which can obtain a berm effect well and reliably. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the slope protection method of the present invention is a method of laying a bag-shaped body on a slope such as an incline, with the weight ratio of the contents contained therein being 80 to 160% when the content is loosely filled, and the bag-shaped body is provided with a lattice-shaped high-strength fiber extending in the longitudinal and circumferential directions exposed on the outside of the bag-shaped body, and has a flexibility that allows it to be stretched along the unevenness of the surface of the slope to be greened, and the bag-shaped body and a net-shaped, mat-shaped or sheet-shaped member without the bag-shaped body attached are integrated in advance before being laid on the slope, and the bag-shaped body is fixed to the slope with multiple fixing members penetrating it, thereby achieving a berm effect (Claim 1). [Effects of the Invention]

[0010] The present invention provides a slope protection method that can effectively and reliably obtain the berm effect. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1(A) is a perspective view showing the configuration of a slope protection device used in a slope protection method according to one embodiment of the present invention in an unfolded state, and FIG. 1(B) is an explanatory diagram showing a method for storing the slope protection device. [Figure 2]FIG. 4 is an explanatory diagram illustrating the configuration of a bag-shaped body of the mortar bag of the slope protection equipment. [Figure 3] (A) is a longitudinal cross-sectional view showing the installation state of the slope protection equipment, and (B) and (C) are explanatory diagrams showing the changes in the state of the slope protection equipment laid on a slope. [Figure 4] 10A and 10B are explanatory views schematically showing the configuration of a modified example of the bag-shaped body before and after formation. [Figure 5] 10(A) and 10(B) are explanatory views schematically showing the configuration of another modified example of the bag-shaped body before and after formation. [Figure 6] 10(A) and 10(B) are explanatory views each schematically showing the configuration of a further modified example of the bag-shaped body. [Figure 7] FIG. 10 is an explanatory view schematically showing the configuration of another modified example of the slope protection equipment. [Figure 8] 8(A) and 8(B) are explanatory diagrams schematically showing changes in the state of the slope protection equipment of FIG. 7 laid on a slope. [Figure 9] 10(A) and 10(B) are explanatory views each showing a schematic configuration of a modified example of the slope protection equipment. DETAILED DESCRIPTION OF THE INVENTION

[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 the net-like member 2.

[0015] The net-like member 2 has storage compartments 5 at appropriate intervals along its length. In this example, the net-like member 2 is, for example, 1 m wide and 5 to 10 m long, and the storage compartments 5 are provided at 30 cm intervals along its length. In other words, only a portion of the net-like member 2 (slope protection equipment 1) is shown in FIG. 1(A). Each storage compartment 5 accommodates a mortar bag 3 or a base material bag 4. In the example shown in FIGS. 1(A) and 3(A), one out of every three storage compartments 5 accommodates a mortar bag 3, and the remaining storage compartments 5 accommodate base material bags 4. The storage compartments 5 are formed in a bag, tube, or pocket shape large enough to accommodate the mortar bag 3 or base material bag 4. Each of the bags 3 and 4 is inserted into the storage compartment 5 from one end, thereby being 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 corrosive fibers (such as coconut fibers) with a mesh size of about 5 to 10 mm, and both of these (durable fibers and corrosive fibers) may be layered together. Furthermore, to improve strength, wire mesh (such as tortoiseshell wire mesh or lath wire mesh) may be layered on the net-like member 2.

[0017] As shown in FIG. 1(A), the mortar bag 3 is a long, narrow, cylindrical bag-shaped body 3a with closed ends, which is water- or moisture-permeable and contains dry mortar (an example of a hardening material) 3b that hardens upon water absorption. Since the bag-shaped body 3a does not contain any material that creates voids (e.g., a base material that loses mass over time due to fertilizer leaching, etc.), it can be made stronger. In this example, the dry mortar 3b is made by mixing granular sand with cement as aggregate. However, the aggregate that makes up the dry mortar 3b is not limited to sand; other materials such as vermiculite and perlite (pumice) can also be used. The bag-shaped body 3a can be filled with only the hardening material that hardens upon water or moisture absorption, or with the hardening material mixed with aggregate alone, resulting in a stronger hardening bag. Furthermore, a reinforcing material, such as steel fiber, can be mixed with the dry mortar to enhance the strength of the hardened mortar bag 3.

[0018] The amount of the contents filled into the bag-shaped body 3a is set to 80 to 160% by weight, with the loosely filled amount being 100%. Loose filling refers to filling the bag-shaped body 3a by allowing the contents to fall naturally, a method commonly used to measure "loose bulk density." If the amount of the contents filled into the bag-shaped body 3a exceeds 160%, the strength is improved, but the mortar bag 3 loses flexibility, making it difficult to conform to the slope N, and additional material costs are required. Conversely, if the filling amount falls below 80%, the mortar bag 3 conforms to the slope N well, but voids form within the bag-shaped body 3a, preventing the hardened material from becoming integrated with the bag-shaped body 3a during hardening, resulting in a lack of solidity and strength (see Table 1 below).

[0019] [Table 1]

[0020] For example, if a material with a cement:sand ratio of 1:2 (by weight) is used as the dry mortar 3b, setting the above filling amount to approximately 128% will result in a mortar bag 3 that is extremely excellent in terms of both strength and ability to conform to the slope N.

[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 longitudinal strength of the bag-like body 3a. The high-strength fiber 8 is used in at least the longitudinal direction of the bag-like body 3a, and this high-strength fiber 8 increases the longitudinal strength of the bag-like body 3a. The high-strength fiber 8 may be bonded (e.g., by heat fusion or adhesion) or connected (e.g., by stitching) to one or both of the bags 6, 7, or may simply be inserted between the two bags 6, 7. The inner bag 6 may simply be inserted into the outer bag body 7, or may be bonded or connected, for example, to the outer bag 7 directly or indirectly via the high-strength fiber 8. In the case where the inner bag body 6 is simply inserted into the outer bag body 7, for example, dry mortar 3b may be placed inside the inner bag body 6, and then 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 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 high-strength fibers 8 may be synthetic fibers such as polyethylene, polyester, nylon, vinylon, etc., which are manufactured to be strong enough for industrial use, or high-strength glass fibers, carbon fibers, aramid fibers, etc.

[0024] The substrate bag 4 is a long, narrow, cylindrical bag-like body 4a with both ends closed, containing a substrate 4b. The bag-like body 4a can be formed using a water- or moisture-permeable sheet material that does not allow the substrate 4b to pass through. Its material can be the same as that of the bags 6 and 7. The substrate 4b can be a vegetation substrate containing, for example, vegetation seeds, growth aids (water-retaining materials, fertilizers, etc.), or soil conditioners, or it can be other conventional substrates, or even a mixture of a vegetation substrate and a conventional substrate. Examples of the vegetation substrate include a vermiculite-based mixture containing vegetation seeds, or a topsoil seed bank, specifically, a mixture of topsoil containing vegetation seeds from natural ground or forests near the slope protection area (revegetation area) with appropriate growth aids such as peat moss, bark compost, and water-retaining materials. This ensures that plants can be introduced 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 fishery waste (seashells, crab shells, fruit waste, etc.), and papermaking sludge.

[0025] The slope protection method of this embodiment is completed simply by laying the slope protection device 1 on the slope N, as shown in Figure 3(B). The slope protection device 1 can be installed by fixing it to the slope N by, for example, driving fixing members 9, such as anchor pins. It is also desirable to lay the slope protection device 1 so that each bag 3, 4 is aligned with the contour lines of the slope N. This allows plants to take root in the soil accumulated on the mountain side of each bag 3, 4, creating the aforementioned berm effect, which allows for earlier and more effective greening. It is also desirable from the perspective of improving the landscape. In addition to arranging the mortar bags 3 on the contour lines, they may also be arranged perpendicular to the contour lines, with fixing members 9 cast at their intersections to connect them in a grid pattern (not shown). This construction method can provide a more effective protection for 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 snugly along the slope N. In other words, the bags 3 and 4 have flexibility to the extent that they can be stretched along the slope N even if the slope N is uneven. The same applies to the net-like member 2.

[0027] As shown in Figure 3(B), the dry mortar 3b hardens as moisture is supplied to the mortar bag 3 by rainfall, etc. After the dry mortar 3b hardens, the mortar bag 3 maintains its shape, thereby maintaining the mortar bag 3 in close contact with the slope N. As a result, as shown in Figure 3(C), the eroded soil and sand accumulate on the mountain side of the mortar bag 3, forming a vegetation base 10 and achieving the above-mentioned berm effect. In this example, the amount of material to be filled into the bag-shaped body 3a is taken into consideration, as described above, so that the berm effect can be achieved well and reliably.

[0028] In particular, by placing the fixing members 9 so that one mortar bag 3 is penetrated by multiple fixing members 9, the mortar bag 3 is firmly connected to the head of the fixing member 9 after the dry mortar 3b hardens, forming an integrated structure. This reinforces the net-like member 2 both vertically and horizontally. This also enhances protection against deer trampling. The net-like member 2 in this example is made using a Russell knitting (chain stitch) method, which means that its horizontal strength is weaker than its vertical strength, making it prone to lateral displacement (stretching). However, this lateral strength is significantly reinforced by the mortar bag 3 after the dry mortar 3b hardens. By firmly holding the slope N with the mortar bag 3, the stretchability of the net-like member 2 is limited, improving the protection function of the surface of the slope N. In other words, simply by deploying the slope protection device 1 and securing it with the fixing members 9, the initial movement of boulders falling on the slope N can be effectively suppressed, preventing minor collapses caused by such movements. Therefore, the slope protection device 1 is suitable for use on slopes N prone to collapse by small rockfalls or slopes N prone to erosion, and also helps to suppress frost heave on 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 equipment 1 on the slope N as described above, the vegetation seeds in the base material 4b stored in the base material bag 4 will germinate and grow, allowing for more active greening. Even if the slope protection equipment 1 does not contain any 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 have flown in from the surrounding vegetation, allowing the plants to germinate and grow. Therefore, the slope N can be reliably covered with greenery over almost the entire surface.

[0030] Furthermore, the mortar formed by the dry mortar 3b in the mortar bag 3 has high compressive strength but low bending strength, which means that the mortar is prone to cracking after hardening, but the high-strength fibers 8 that increase the strength of the bag-shaped body 3a make the mortar less likely to crack. Also, 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 if the amount of water supplied to the mortar bag 3 is too small and the dry mortar 3b does not harden sufficiently, the high-strength fibers 8 allow the bag-shaped body 3a to retain its shape.

[0031] Furthermore, 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, which prevents the high-strength fibers 8 from peeling off when dry mortar 3b is placed in the mortar bag 3. Furthermore, 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 (higher 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-shaped body 3a will not adhere closely to the unevenness of the slope N after being laid on the slope N, and a sufficient berm effect will not be obtained. Therefore, in the slope protection tool 1 of this example, as shown in Figures 1(A) and 3(A), a moisture-absorbing bag (drying bag) 13 containing a desiccant and having water or moisture permeability is attached to the net-shaped body 2. Specifically, a storage section 5a having a configuration similar to that of the storage section 5 is provided in the net-shaped body 2, and the moisture-absorbing bag 13 is stored in this storage section 5a.

[0033] Possible desiccants to be stored in the moisture absorption 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 absorption bag 13 may be attached to one slope protection equipment 1 (net-like body 2). In the illustrated example, the moisture absorption 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 to this and may be the center of the slope protection equipment 1 (net-like body 2), etc.

[0035] The moisture absorption bag 13 may be a long, thin tube with both ends closed, similar to the mortar bag 3 and the vegetation bag 4, with its length being approximately the same as 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 long, thin bag, uneven distribution of the desiccant stored inside becomes a problem. Therefore, in this example, in order to prevent or reduce uneven distribution of the desiccant, a desiccant is stored in each of a plurality 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 (8 to 10 cm long) and stored in amounts of 15 g each.

[0036] The slope protection equipment 1 of this example is usually stored and distributed in a rolled state as shown in Figure 1(B) until it is laid on the slope N, and the attachment of the moisture absorption bag 13 prevents the hardening of the dry mortar 3b to some extent until the slope protection equipment 1 is laid on the slope N. However, in order to prevent further hardening of the dry mortar 3b, it is preferable to minimize contact of the slope protection equipment 1 with the outside air containing moisture and humidity before laying it on the slope N. For example, it is possible to package it in a moisture-proof film such as aluminum vapor deposition film or silica vapor deposition film, which has a high moisture-proof effect. Moisture-proof film (thickness 120 μm) laminated with nylon or the like is relatively inexpensive and easy to use.

[0037] Furthermore, as shown in Figure 1(B), if the slope protection equipment 1 is placed in a sealed bag 14 made of 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 a month, but if the moisture absorption bag 13 is used and the dry mortar is vacuum-packed as described above, the dry mortar 3b can remain unhardened for more than six months.

[0039] Furthermore, while desiccants are generally discarded after they have fulfilled their purpose, in this example, the moisture absorption bag 13 containing the desiccant is laid on the slope N while still attached to the net-like body 2. 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 the effect of preventing grass plants from lodging. Furthermore, clay minerals such as bentonite have the ability to retain fertilizer in addition to water retention, so they are expected to be effective in retaining fertilizer that would otherwise be lost. Furthermore, not discarding the moisture absorption 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 becomes smaller by evacuating air, so that transportation costs can be reduced and 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] Note that the present invention is not limited to the above-described embodiments, and it is needless to say 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 N. For example, after arranging the slope protection device 1 in a state where the bags 3, 4, 13 are not attached on the slope N, the bags 3, 4, 13 may be inserted into the accommodating portions 5, 5a. In this case, the slope protection device 1 is lightened, and the transportation to the slope N can be carried out with a small number of people.

[0043] Moreover, the bags 3, 4, 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, 5a of the net-like member 2 that holds the bags 3, 4, 13 may be appropriately changed according to the bags 3, 4, 13.

[0044] A sheet-like member (not shown) formed by using a biodegradable material, a soluble material or a hydrolyzable material such as thin spun cotton, pulp fiber, synthetic resin, etc. may be provided by appropriate means such as adhesion below the net-like member 2 so as to allow water and plant buds and roots to pass through. In this case, it is desirable to configure so that a vegetation base material appropriately selected from vegetation seeds, fertilizers, soil improvers, water retention materials, etc. is adhered to the lower surface of the sheet-like member by a water-soluble paste material, and thereby the sheet-like member is in a state of carrying the vegetation base material. The sheet-like member can also be formed by thinly stretching thin rayon cotton.

[0045] The sheet-like member and net-like member 2 may be fixed directly by adhesion or the like, but for example, the sheet-like member and 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 cast in to lay both of them on the slope N.

[0046] Additionally, the member to which the bags 3, 4, and 13 are attached is not limited to the net-like member 2, but may be a mat-like or sheet-like member. Furthermore, by using the net-like member 2 or the like, the installation of the bags 3, 4, and 13 can be simplified, but the present invention is not limited to this, and only the bags 3, 4, and 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 storage section 5a may not be provided and the moisture absorption bag 13 may be stored in the storage section 5. Furthermore, 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 the bags 3, 4, 13 may be tied to the net-like member 2 with rope, wire, or the like, for example.

[0048] The slope protection method performed by laying the slope protection equipment 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, for example. However, the slope protection method is more suitable for application on slope N in terms of obtaining the berm effect.

[0049] In the example shown in Figure 1(A), a mortar bag 3 is stored in one of every three storage sections 5, and base material bags 4 are stored in the remaining storage sections 5, but this is not limited to this. The ratio of storing mortar bags 3 and base material bags 4 can be changed as appropriate, such as storing a mortar bag 3 in one of every two storage sections 5 and storing base material bags 4 in the remaining storage section 5, or storing mortar bags 3 in all storage sections 5 without using base material bags 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 this. 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 Figure 2 has a three-layer structure, but this 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 iron wire or high-strength fiber rope may be placed 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 device 1 is laid on the slope N, until the dry mortar 3b in the mortar bag 3 hardens and after it hardens, the bag-shaped body 3a may be able to maintain a good state of fitting along the slope N.

[0053] In the bag-shaped body 3a of the mortar bag 3 shown in FIG. 2, high-strength fibers 8 are arranged in a tubular or bag-like shape that covers the outer surface of the inner bag body 6 and the entire inner surface of the outer bag body 7. However, this is not limiting, and the high-strength fibers 8 may be configured to increase the longitudinal strength of the bag-shaped body 3a. Therefore, for example, as shown in FIG. 4(A), high-strength fibers 8 may be fixed in a striped pattern to the sheet-like outer bag body 7, and as shown in FIG. 4(B), the outer bag body 7 may be rolled into a tubular shape with the high-strength fibers 8 on the inside, and the edges may be closed to form the bag-shaped body 3a. The inner bag 6 may be provided during this formation process, or the high-strength fibers 8 may be provided in the inner bag body 6 rather than the outer bag 7, and the inner bag 6 may be rolled into a tubular shape with the high-strength fibers 8 on the outside. In either case, in the formed bag-shaped body 3a, the high-strength fibers 8 have portions that extend in the longitudinal direction of the bag-shaped body 3a, thereby increasing the longitudinal strength of the bag-shaped body 3a.

[0054] Furthermore, in the modified example shown in Figures 4(A) and (B), the high-strength fibers 8 only have portions that extend in the longitudinal direction of the bag-shaped body 3a, but they may also have portions that extend in the circumferential direction of the bag-shaped body 3a.As an 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 they can increase the longitudinal strength of the bag-shaped body 3a. For example, as shown in Figure 6(A), they can be arranged so that they pass along the diagonal of the rectangular inner bag body 6 or outer bag body 7, or they can be arranged so that the high-strength fibers 8 extend spirally when the inner bag body 6 or outer bag body 7 is rolled into a cylindrical shape (see Figure 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 an adverse effect on some vegetation. Therefore, taking into consideration that mortar will mainly flow out from the mortar bag 3 onto the valley side of the mortar bag 3, by placing a neutralizing bag 11 on the valley side of the mortar bag 3 as shown in Figures 7, 8(A) and (B), it is possible to suppress the adverse effects of mortar flow on vegetation. To ensure this 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 is a bag-like body 11a having a long, narrow cylindrical shape with both ends closed, and contains an alkali neutralizing agent 11b. The bag-like body 11a can be formed using a water-permeable or moisture-permeable sheet material that is impermeable to the alkali neutralizing agent 11b, and the same material as the bags 6 and 7 can be used for the bag-like body 11a. The alkali neutralizing agent 11b can be, for example, peat moss (acidic) or a carbon material treated with an acid (e.g., a material obtained by contacting hydrochloric acid with carbonized plant matter that has been carbonized after being contacted with a solution containing calcium chloride).

[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 this, 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] To promote germination and growth of plants in the vegetation base 10 (see FIG. 3(C)) formed on the hill side of the mortar bag 3, a fertilizer bag 12 may be placed on the hill 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 may be, for example, a base material bag 4 specifically designed to store 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 place 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 neutralizing bag 11 are stored in one storage section 5, but this is not limiting, and for example, as shown in FIG. 9(B), a plurality of storage sections 5 may be provided in series on the net-like member 2, and each storage section 5 may store a mortar bag 3 and a neutralizing bag 11 individually. This also applies when a fertilizer bag 12 is used instead of or in addition to the neutralizing 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 neutralizing bag 11 stored as a pair in one storage section 5 are individually pierced with the fixing member 9, but it is also possible to pierce and fix only the mortar bag 3 on the mountain side of the mortar bag 3 and neutralizing bag 11 with the fixing member 9. Note that, as shown in Figures 3(B) and (C), the mortar bag 3 stored individually in the storage section 5 is individually pierced with the fixing member 9 and fixed to the slope N, and the base material bag 4 is fixed in the same way.

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

[0064] Furthermore, in 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 bags 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 fiber 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 slope, the bag-shaped body having a weight ratio of 80 to 160% of the weight of the contents contained therein when the content is loosely filled to 100%, the method comprising: The bag-shaped body has a lattice-shaped high-strength fiber extending in the longitudinal and circumferential directions exposed on the outside of the bag body, and has flexibility to the 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-shaped body and the net-shaped, mat-shaped or sheet-shaped member without the bag-shaped body attached are integrated in advance before being laid on the slope, A slope protection method characterized in that a bag-shaped body is fixed to the slope in a state where it is penetrated by a plurality of fixing members, thereby achieving a berm effect.

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