JP2022146171A - Method for protecting slope - Google Patents

Abstract

To provide a method for protecting a slope capable of improving the function of protecting a surface layer of the slope (suppressing the initial movement of boulder falling, preventing a small collapse, and suppressing frost heave).SOLUTION: A three-dimensional wire mesh 1 having a hardening material bag 2 containing a hardening material in a bag-like body is laid on a slope S. The three-dimensional wire mesh 1 is configured by engaging a plurality of wire rods 4 bent in a substantially spiral shape with each other so that the spiral axes of the wire rods 4 are substantially parallel to each other. The hardening material bag 2 is housed in a portion of the wires 4 of the three-dimensional wire mesh 1 so as to pass through the helical axis.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a slope protection method for protecting slopes such as slopes, for example.

Conventionally, the present applicant has proposed a slope protection method in which a slope protection tool having a bag-shaped body containing a hardening material that hardens by absorbing water or moisture is laid on a slope (Patent Document 1). In this slope protection method, a vegetation base is formed in a small step on the mountain side of the bag-like body by the deposited sediment that is dammed up by the bag-like object, the leaves of trees from the surroundings, and the like, and the plants grow easily on this small step. The so-called small-step effect enables early and favorable greening. In other words, the term "bread effect" as used herein refers to the effect of accumulating earth and sand forming a growth base layer having a gentler gradient than a slope in the shape of a small step, and facilitating the growth of plants on this small step.

JP 2016-223265 A

However, in the slope protection method described above, there is room for improvement in terms of the function of protecting the slope surface layer (suppressing the initial movement of boulder falling, preventing small collapse, and suppressing frost heave).

The present invention has been made in consideration of the above-mentioned matters, and its purpose is to provide a slope protection method that can improve the function of protecting the slope surface layer (preventing the initial movement of falling stones, preventing small collapses, and suppressing frost heave). to provide.

In order to achieve the above object, a method for protecting a slope according to the present invention lays on a slope a three-dimensional wire mesh provided with a hardening material bag containing a hardening material in a bag-like body (claim 1).

In the slope protection method described above, the three-dimensional wire mesh is formed by engaging a plurality of substantially spirally bent wire rods so that the spiral axes of the wire rods are substantially parallel to each other, and the hardening material bag includes: It may be accommodated so that the helical axis may pass through a part of the wires of the three-dimensional wire mesh (Claim 2).

In the slope protection method described above, the hardening material bag may be pierced by a plurality of fixing members driven into the slope and laid on the slope together with the three-dimensional wire mesh (Claim 3).

In the slope protection method, each wire of the three-dimensional wire mesh has an upwardly convex upper line portion and a downwardly convex underline portion, and the convexity of the underline portion has a gentler curve than the convexity of the upper wire portion. (Claim 4).

In the slope protection method described above, the three-dimensional wire mesh may also include a base material bag containing a base material in a bag-like body (claim 5).

In the slope protection method described above, a plurality of fin-shaped portions may be arranged in a longitudinal direction on the outer surface of the base material bag (Claim 6).

According to the present invention, a method for protecting a slope can be obtained that can improve the function of protecting the surface layer of the slope (suppressing the initial movement of boulders, preventing small collapses, and suppressing frost heave).

That is, in the slope protection method of the invention according to each claim of the present application, the hardening material bag provided in the three-dimensional wire mesh laid on the slope is in close contact with the slope over a wide area due to its weight, so it protects the surface of the slope (to prevent boulders from falling). initial movement suppression, small collapse prevention, frost heave suppression) functions can be improved. In particular, compared to the case where only the three-dimensional wire netting is laid, the slope protector composed of the three-dimensional wire mesh provided with the hardening material bag according to the present method is easier to follow the slope due to the weight of the hardening material storage part. As a result, the number of anchor pins, pegs, etc. used can be reduced, which in turn contributes to the improvement of workability.

In the slope protection method of the invention according to claim 2, the hardening material bag is accommodated so as to pass through the spiral axis in a part of the wire rod of the three-dimensional wire mesh. , this can be easily accommodated.

In the slope protection method of the invention according to claim 3, since the fixing members driven into the slope can be used to fix both the three-dimensional wire mesh and the hardening material bag to the slope, the number of fixing members used can be reduced accordingly. It can be suppressed to a small amount, which in turn contributes to the improvement of workability.

In the slope protection method of the invention according to claim 4, since the underline portion of each wire has a relatively gently curved shape that protrudes downward, the hardening material bag placed thereon is prevented from coming into contact with the slope. The hardened material bag has a higher function of protecting the slope surface layer.

In the slope protection method of the invention according to claim 5, the base material bag contributes to early greening.

In the slope protection method of the invention according to claim 6, for example, even if the base material bag slightly floats from the slope, if the gap is filled with a fin-shaped part that passes through the mesh of the three-dimensional wire mesh, the base material bag can be protected. It is possible to make it easier to retain runoff earth and sand on the mountain side, and eventually to obtain the small step effect more reliably.

(A) is an explanatory diagram of a slope protection method according to an embodiment of the present invention, and (B) is a plan view of slope protectors used in the slope protection method. (A) and (B) are a perspective view and a front view of the slope protector. (A) to (C) are explanatory diagrams of modifications of the slope protection method. (A) is an explanatory diagram showing the slope protector covered with a base material to the extent that a part of the upper line part of the three-dimensional wire mesh is exposed, and (B) is an explanatory diagram showing a state in which the base material is reduced from (A). is. FIG. 11 is a plan view of slope protectors used in another modification of the slope protection method. (A) to (C) are explanatory diagrams showing a method of manufacturing a base material bag used in another modification of the slope protection method, and (D) is an explanatory diagram of a slope protector using the base material bag. be.

Embodiments of the present invention are described below.

In the slope protection method according to the present embodiment, as shown in FIG. is arranged.

As shown in FIGS. 2(A) and 2(B), the three-dimensional wire mesh 1 is configured by engaging a plurality of wire rods 4 bent in a substantially spiral shape so that the spiral axes of the wire rods 4 are substantially parallel to each other. It is a rhombic wire mesh (wire lath) with a three-dimensional thickness. As shown in FIG. 1(B), the three-dimensional wire mesh 1 has a generally rectangular shape in a plan view as a whole, and is configured such that the helical axes of the wire rods 4 extend in the lateral direction thereof.

The three-dimensional wire mesh 1 of this example has a width of approximately 1500 mm, a length of approximately 5000 mm, a mesh size of approximately 80 mm, and a thickness (height) of approximately 36 mm. The wire rod 4 is made of, for example, zinc-plated iron wire, and may be of any thickness according to the required strength. If it is too large, the weight of the obtained wire mesh will make installation difficult, so the thickness is preferably 1 to 10 mm. Here, both ends of the wire rod 4 may be processed by appropriate processing such as knuckle processing and twist processing.

Each wire 4 has an upwardly convex curved upper wire portion 4a and a downwardly convex curved underline portion 4b, as shown in FIGS. are alternately and repeatedly connected to form a substantially spiral shape, and the projection of the underlined portion 4b is curved (arc) more gently than the projection of the overlined portion 4a.

The hardening material bag 2 contains dry mortar (an example of a hardening material) that hardens by absorbing water in a long and narrow tubular bag-like body with both ends closed. Since it does not contain a material such as a base material that loses weight over time due to the elution of fertilizer components, etc., it is possible to increase the strength. The dry mortar of this example is a mixture of cement and granular sand as an aggregate, but the aggregate constituting the dry mortar is not limited to sand, but vermiculite, perlite (pumice stone), etc. can also be used. can. The material to be contained in the bag-shaped body can be a hardening bag having high strength by containing only the hardening material or by containing only the hardening material mixed with aggregate. The curable material may be one that cures over time by absorbing water or moisture, or one that cures over time by stimuli other than moisture, such as oxidation, light irradiation, and heat. Further, a reinforcing material such as steel fiber may be mixed with the hardening material such as dry mortar so that the effect of improving the strength of the hardening material bag 2 after hardening can be obtained.

Here, the filling amount of the contents in the bag-like body is set to 80 to 160% by weight when the rough filling is taken as 100%. Rough filling is to fill the bag-shaped body by allowing the content to drop naturally, and is a method generally used when measuring the "loose bulk density". If the filling amount of the bag-shaped body exceeds 160%, the strength is good, but the flexibility of the hardening material bag 2 is lost, making it difficult to follow the slope S, and the material cost is also required. becomes. Conversely, if the filling amount is less than 80%, the hardening material bag 2 fits well on the slope S, but voids occur in the bag-like body, and the hardening material does not integrate with the bag-like body during hardening. For this reason, a solid hardened body cannot be obtained, resulting in insufficient strength.

For example, when using a dry mortar with a cement:sand ratio of 1:2 (weight ratio), if the filling amount is set to about 128%, both the strength and the ability to follow the slope S can be improved. A very good cured material bag 2 is obtained.

Moreover, the bag-shaped body constituting the hardening material bag 2 is not limited to a single-layer structure, and may have a double-layer structure. A sheet-like high-strength fiber may be arranged for the purpose. Of course, the bag-like body may have a multi-layered structure of three or more layers. In any case, the bag-like body should have a property that does not allow the curable material to pass therethrough and does not at least completely prevent the stimulus necessary for curing the curable material from being applied to the curable material. good. For example, when the hardening material is dry mortar, the material of the bag-shaped body can be formed using a sheet-shaped body that is impervious to dry mortar and has water permeability. Cloths (woven fabrics), knitted fabrics, jute fabrics, water-degradable plastics, thin cotton, and the like can be mentioned.

Here, from the viewpoint of stabilizing and ensuring the holding of the curing material bag 2 by the three-dimensional wire netting 1, the wire 4 containing the curing material bag 2 spirally embraces the curing material bag 2 (repeating the wire 4). It is preferable that the hardening material bag 2 is in contact with each of the continuous upper line portion 4a and the lower line portion 4b. By doing so, the three-dimensional wire mesh 1 can be easily and firmly bitten into the hardening material bag 2 before hardening. stability is further enhanced.

As shown in FIG. 1(A), the slope protection method of this example involves laying a three-dimensional wire mesh 1 on the slope S, which is a slope, and holding a hardening material bag 2 on the three-dimensional wire mesh 1. This can be done by fixing both 1 and 2 to the slope S with anchor pins 5 . At this time, the three-dimensional wire mesh 1 is arranged so that the lateral direction (the spiral axis direction of each wire rod 4) and the longitudinal direction of the hardening material bag 2 are along the contour lines of the slope S.

In this example, the hardening material bag 2 is inserted into the inner space of the wire rod 4 at one end in the longitudinal direction of the three-dimensional wire mesh 1 that has been wound in the longitudinal direction in a roll shape in advance so that the hardening material bag 2 passes through the spiral axis. 2 and fixed to the slope S together with the three-dimensional wire mesh 1, the three-dimensional wire mesh 1 is deployed toward the toe side of the slope, and hardened material is applied at regular intervals (for example, 480 mm) from the shoulder to the toe of the slope. The bags 2 are fixed by the anchor pins 5 while being inserted into the three-dimensional wire mesh 1 (inside space of the wires 4). At least a part of the anchor pins 5 to be driven in the part located on the side of the slope (upper side) is provided with more A slightly larger anchor pin is used to ensure strong fixation.

The hardening material bag 2 laid on the slope S as described above is arranged along the slope S without a gap due to its own weight. In other words, the hardening material bag 2 is flexible enough to be stretched along the slope S even if the slope S is uneven.

For example, if the hardening material stored in the hardening material bag 2 is dry mortar, the hardening material hardens as water is supplied into the hardening material bag 2 by rainfall or the like. After the hardening material hardens in this manner, the hardening material bag 2 maintains its shape, and the close contact state of the hardening material bag 2 with the slope S is maintained. A vegetation base is reliably formed by depositing runoff sediment, etc., and the above-mentioned bench effect is obtained. In this example, as described above, the filling amount of the bag-like body of the hardening material bag 2 is taken into account, so that the small step effect can be obtained satisfactorily and reliably.

In particular, when driving the anchor pins 5 as the fixing member, by setting one hardening material bag 2 in a state of being penetrated by a plurality of anchor pins 5, the hardening material can be fixed after hardening. Since the bag 2 is firmly connected to the head of the anchor pin 5 to form an integral structure, the three-dimensional wire mesh 1 can be reinforced in both the vertical and horizontal directions. In this case, the protection against deer trampling is also enhanced. That is, by simply arranging the three-dimensional wire netting 1 and the hardening material bag 2 on the slope S and fixing them with the anchor pins 5, the initial movement of boulders falling on the slope S can be effectively suppressed, and the resulting small collapse can be prevented. can. Therefore, the three-dimensional wire mesh 1 and the hardening material bag 2 are suitable for use on the slope S that is prone to collapse of small rocks and the slope S that is prone to erosion, and contributes to the suppression of frost heave on the slope S. The slope protection method will be applicable as a greening (slope protection) foundation work.

By implementing the slope protection method in which the three-dimensional wire netting 1 and the hardening material bag 2 are laid on the slope S as described above, flying seeds from the surrounding vegetation can can be effectively captured, and plants germinate and grow.

Moreover, when the hardening material of the hardening material bag 2 is dry mortar, the compressive strength of the mortar formed by the dry mortar is high, but the bending strength is low. If high-strength fibers are provided to enhance the strength of the bag-shaped body of the hardening material bag 2, the mortar will not crack easily. In addition, the bag-shaped body of the hardening material bag 2 is thick and the water does not sufficiently penetrate into the inside of the bag-shaped body, or the amount of water supplied to the hardening material bag 2 is small, so that the dry mortar hardens sufficiently. Instead, the bag can be made shape-retainable with high-strength fibers.

If the bag-like body of the hardening material bag 2 has a double structure and the high-strength fibers are sandwiched between the two layers, the high-strength fibers are peeled off when the dry mortar is accommodated in the hardening material bag 2. In addition, it is expected that the water retention performance will be improved by forming a space in the three-layer structure of the bag-shaped body, and the curing effect of the mortar will be enhanced (higher strength). can also

Here, the anchor pin 5 is driven into the hardening material bag 2 so that the hardening material bag 2 is held by the head of the anchor pin 5 driven into the valley side of the hardening material bag 2 as shown in FIG. 1(A). Alternatively, the anchor pin 5 may pass through the hardening material bag 2 as described above. Then, if necessary, in order to fix the three-dimensional wire mesh 1 to the slope S, the anchor pins 5 may be driven into appropriate places (wires 4) in the three-dimensional wire mesh 1 where the hardening material bag 2 is not accommodated. .

If the three-dimensional wire mesh 1 with the hardening material bags 2 inserted therein can be rolled into a roll, the hardening material bags 2 may be inserted (attached) to the three-dimensional wire mesh 1 in advance. Even if the three-dimensional wire mesh 1 in which the hardening material bag 2 is inserted cannot be wound into a roll, if the three-dimensional wire mesh 1 is to be transported in an unfolded state, the hardening material bag 2 is preliminarily may be inserted (attached) to the

In the slope protection method of the present example described above, the hardening material bag 2 provided in the three-dimensional wire mesh 1 laid on the slope S is in close contact with the slope S over a wide area due to its weight, so that the surface layer of the slope S is protected (to prevent boulders from falling). initial movement suppression, small collapse prevention, frost heave suppression) functions can be improved. In particular, compared to the case where only the three-dimensional wire mesh 1 is laid, the slope protector D configured by the three-dimensional wire mesh 1 equipped with the hardening material bag 2 according to this method has a weight in the hardening material storage portion, and the slope S As a result, the number of anchor pins 5 and pegs to be used can be reduced, which in turn contributes to the improvement of workability. In addition, when only the three-dimensional wire netting 1 is laid, only the anchor pins 5 press the three-dimensional wire netting 1 against the slope S, so the three-dimensional wire netting 1 as a whole has a large portion that rises from the slope S, and gravity acts on this. As a result, so-called sagging (a portion that bends in a bow shape) is likely to occur in the three-dimensional wire mesh 1, and there is a problem that it is not preferable in terms of appearance. can also be achieved.

Further, in this example, the hardening material bag 2 is accommodated so as to pass through the helical axis in a portion of the wire 4 of the three-dimensional wire mesh 1. By making the hardening material bag 2 elongated, can be easily done.

Furthermore, in this example, the anchor pin 5, which is a fixing member to be driven into the slope S, can be used to fix both the three-dimensional wire mesh 1 and the hardening material bag 2 to the slope S, so the number of fixing members used can be reduced accordingly. It can be suppressed to a small amount, which in turn contributes to the improvement of workability. The anchor pin 5 is fixed by the anchor pin 5 so as to penetrate the hardening material bag 2 rather than driving the anchor pin 5 into the valley side of the hardening material bag 2 and holding the hardening material bag 2 with its head. can be performed more strongly and favorably.

Moreover, in this example, since the underlined portion 4b of each wire rod 4 has a relatively gently curved shape that protrudes downward, the hardening material bag 2 placed thereon is prevented from coming into contact with the slope S by the underlined portion 4b. is difficult to prevent, and the function of protecting the surface layer of the slope S by the hardening material bag 2 is enhanced accordingly.

It goes without saying that the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the gist of the present invention. For example, the following modifications can be given.

In the above-described embodiment, the main purpose is to protect the slope S, and only the slope protector D composed of the three-dimensional wire mesh 1 and the hardening material bag 2 is arranged on the slope S. As shown in 3(A), the substrate 3 may be arranged on the slope S together with the slope protector D. FIG. Specifically, it is conceivable to form a layer of the base material 3 so as to cover the slope protector D laid on the slope S by spraying or scattering the base material 3 . That is, from a different point of view, it can be said that the slope protector D constructed by the slope protection method of the above embodiment can be used as a base for the base material spraying method.

The base material 3 may be a vegetation base material appropriately selected from, for example, seeds of greening plants (vegetation seeds), growth aids (water-retaining materials, fertilizers, etc.), soil conditioners, and the like. However, it may be another normal base material, or a mixture of a vegetation base material and a normal base material. Examples of the vegetation base material include those containing vegetation seeds mainly composed of vermiculite, and topsoil seed banks. Examples include those obtained by appropriately mixing growth aids such as peat moss, bark compost, and water-retaining material with topsoil containing vegetation seeds such as forests. In this case, it is possible to reliably introduce the plant in a streak-like manner. In addition, the above-mentioned ordinary substrates include substrates appropriately selected from materials that do not harm vegetation, such as wood chips, agricultural and fishery wastes (shells, crab shells, fruit scraps, etc.), papermaking sludge, and the like. material.

When the substrate 3 is arranged on the slope S in this way, the vegetation can be restored by the substrate 3 . In particular, when the topsoil collected from the slope S or its surroundings (topsoil seed bank, buried seed mixed topsoil) is used as the base material 3, the slope protection method of this example can be used in harmony with the surrounding environment. It can be implemented as a forest topsoil utilization work that restores the vegetation that has been removed.

Here, forming the underlined portions 4b of the wire rods 4 of the three-dimensional wire mesh 1 into a relatively gently curved shape that protrudes downward contributes to an improvement in the holding force of the base material 3. As shown in FIG. That is, the holding force of the base material 3 is related not only to the shape of the three-dimensional wire mesh 1 and the presence or absence of the hardening material bag 2 but also to the frictional resistance of the base material 3 itself against the slope S. Then, if the three-dimensional wire mesh 1 is used, the lower surface of which has an uneven wave shape as a whole, and the gentle curvature of the underlined portion 4b of the wire rod 4 leads to an increase in the portion adjacent to the slope S in the underlined portion 4b. The substrate 3 is easily held in the gap below 4b, and accordingly the frictional resistance of the three-dimensional wire netting 1 and the substrate 3 against the slope S increases, resulting in an enhanced effect of preventing the substrate 3 from flowing out.

In addition, since the underlined portion 4b of each wire 4 has a relatively gently curved shape that protrudes downward, the underlined portion 4b does not easily prevent the hardening material bag 2 placed thereon from contacting the slope S. The effect of preventing the base material 3 from flowing out by the hardening material bag 2 is enhanced. In addition, when the underlined portion 4b is pressed by the hardening material bag 2 placed on the underlined portion 4b, and both the left and right ends of the underlined portion 4b are pushed down so as to come into contact with the slope S, the deformed underlined portion 4b is placed on both the left and right sides of the deformed underlined portion 4b. If the two upper wire portions 4a that are continuous with each other have a gently curved shape, both upper wire portions 4a are likely to move greatly downward due to the deformation, and the thickness of the three-dimensional wire mesh 1 is reduced at that portion (i.e. (Thinner and lower) leads to a decrease in the amount of the base material 3 that can be held. As a result, both the upper wire portions 4a are more likely to deform so that the curvature becomes larger than when moving downward, and as a result, the thickness of the three-dimensional wire mesh 1 is difficult to decrease, so the amount of holding the base material 3 is reduced. can be prevented.

In the example of FIG. 3(A), the three-dimensional wire mesh 1 is completely covered with the base material 3, but not limited to this, for example, as shown in (B) and (C) of the same figure, the three-dimensional wire mesh 1 At least part of the may not be covered with the base material 3. In this case, the part of the three-dimensional wire mesh 1 exposed to the outside of the base material 3 makes it easier to capture flying seeds and fallen leaves. The slope protection method can be implemented as a natural encroachment promotion work that excels in restoring vegetation in harmony with the surrounding environment. Moreover, in this case, the amount of the base material 3 used can be reduced, which contributes to the reduction of the labor and cost required for construction.

Here, in contrast to the three-dimensional wire mesh 1 having a thickness (height) of about 36 mm (36±2 mm), the thickness of the base material 3 is set to 50 mm (5 cm) in FIG. . On the other hand, in FIG. 3B, the thickness of the base material 3 is 30 mm (3 cm) so that only the upper portion (upper line portion 4a) of the three-dimensional wire mesh 1 is exposed. As indicated by the solid lines in the right side view of (A), a plurality of exposed portions (upper line portions 4a) extend in a direction oblique to the contour line on the slope S and are arranged in a substantially zigzag pattern.

As shown in FIGS. 1(A) and 2(B), the width of the upper wire portion 4a of each wire 4 constituting the three-dimensional wire mesh 1 is narrowed toward the upper side, and at least the upper wire portion 4a is If the three-dimensional wire mesh 1 is covered with the base material 3 so that the whole is not exposed, the base material 3 will be eroded or washed away by, for example, a guerrilla rainstorm or a typhoon, and the state shown in FIG. A) Furthermore, even in the state shown in (B), the amount of exposure of the upper wire portion 4a to the surface of the base material 3 increases as this progresses, and the ability to capture flying seeds and the like will be enhanced, and vegetation will grow. A large loss of restoring force is prevented.

In the examples shown in FIGS. 1(A) and (B) and FIGS. 2(A) and (B), the three-dimensional wire netting 1 holds only the curing material bag 2, but is not limited to this. As shown, the three-dimensional wire mesh 1 may hold the base material bag 6 together with the hardening material bag 2 to constitute the slope protector D.

Here, the base material bag 6 contains the base material 3 in an elongated tubular bag-like body with both ends closed. For example, the same material as the bag-like body of the hardening material bag 2 can be used as the material for the bag-like body.

In the example of FIG. 5, the curing material bag 2 and the base material bag 6 are arranged at equal intervals in the longitudinal direction of the three-dimensional wire mesh 1, and one curing material bag 2 and two base material bags 6 are arranged in this order repeatedly. However, the arrangement method and ratio of the hardening material bag 2 and the base material bag 6 are not limited to this.

By the way, when only the three-dimensional wire netting 1 is fixed to the slope S with a predetermined number of anchor pins 5, a gap is inevitably created because it cannot fit in with the unevenness of the slope S. The more uneven the slope S is, the larger the gap becomes, and the number of gaps tends to increase.

In this regard, if the hardening material bag 2 is attached to the three-dimensional wire mesh 1 and fixed by driving the hardening material bag 2 so that the anchor pin 5 penetrates it, the three-dimensional wire mesh 1 and the hardening material bag 2 will conform to the unevenness of the slope S. easier to follow.

On the other hand, if the base material bag 6 is to be driven through it, for example, anchor pins 5 with a relatively small diameter (for example, 5 mm in diameter) are used, and the base material bag 6 is held by the head of the anchor pin. If it is to be driven, it is conceivable to use an anchor pin 5 with a relatively large diameter (for example, 9 mm in diameter), but in any case, the gap with the slope S tends to increase.

Therefore, as shown in FIGS. 6A and 6B, when the bag-like body 6a of the base material bag 6 is made by sewing one sheet-like body 7 into a tubular shape, the seam allowance (fin) An example of the shape portion) 7a is made significantly longer than usual, and as shown in FIG. can be

Here, when the sheet-like body 7 is sewn into a tubular shape, it is conceivable that the width of the seam allowance portion 7a extending in the longitudinal direction of the bag-like body 6a to be formed is about 10 to 100 mm. However, even if it is attached to the three-dimensional wire mesh 1 as it is, the seam allowance portion 7a enters the inner space of the wire rod 4 of the three-dimensional wire mesh 1, so the gap cannot be sufficiently filled, and the contribution to preventing the erosion of earth and sand on the slope S is limited. It becomes a thing.

Therefore, in order to make the seam allowance portion 7a exhibit a good effect of preventing the erosion of earth and sand, for example, slits 7b are formed in the seam allowance portion 7a at intervals of the mesh size of the three-dimensional wire netting 1 as shown in FIG. When the contact points between the adjacent wire rods 4 of the three-dimensional wire mesh 1 are fitted into each other, each of the plurality of seam allowances 7a aligned in the longitudinal direction of the bag-like body 6a as a set of two upper and lower sheets protrudes from the three-dimensional wire mesh 1 to the slope S side. It is preferable that

In this way, the seam allowance portion 7a projecting from the inner space of the wire 4 through the mesh of the three-dimensional wire mesh 1 to the side of the slope S fills the gap generated between the slope S and the base material bag 6 due to unevenness or the like. (See FIG. 6(D)), it can hold the earth and sand that move due to wind, rain, frost heave, and the like.

In the example of FIG. 6(C), the lengths of the upper and lower seam allowances 7a for each set are substantially the same, but the upper seam allowance 7a may be longer or shorter than the lower seam allowance 7a. . Further, the means for forming the sheet-like body 7 into a tubular shape does not depend on sewing, but may be, for example, thermocompression bonding.

In the example of FIGS. 6A to 6C, the seam allowance portion 7a that is always formed when the bag-like body 6a of the base material 6 is sewn from the sheet-like body 7 is used. For example, a sheet piece having the same shape as the seam allowance portion 7a shown in FIG. In addition, a plurality of fin-shaped parts that can pass through the mesh of the three-dimensional wire mesh 1 may be arranged in the longitudinal direction. In this case, the fin-like portions provided on the outer surface of the bag-like body 6a can be a set of one fin or a set of three or more fins instead of a set of two upper and lower fins.

In addition, such a fin-shaped portion (seam allowance portion 7a) may be provided in (the bag-shaped body of) the hardening material bag 2 .

In addition, it cannot be overemphasized that you may combine suitably the modification mentioned in this specification.

1 three-dimensional wire mesh 2 hardening material bag 3 base material 4 wire rod 4a upper line part 4b underline part 5 anchor pin 6 base material bag 6a bag-like body 7 sheet-like body 7a seam allowance part 7b slit D slope protector S slope

Claims (6)

A method for protecting a slope, comprising laying a three-dimensional wire mesh having a hardening material bag containing a hardening material in a bag-like body on the slope. The three-dimensional wire mesh is configured by engaging a plurality of substantially spirally bent wire rods so that the spiral axes of the wire rods are substantially parallel to each other,
2. The slope protection method according to claim 1, wherein said hardening material bag is housed in a portion of the wires of said three-dimensional wire mesh so as to pass through the spiral axis thereof. 3. The slope protection method according to claim 1, wherein the hardening material bag is pierced by a plurality of fixing members driven into the slope and laid on the slope together with the three-dimensional wire mesh. Each wire of the three-dimensional wire mesh has an upper wire portion that protrudes upward and an underline portion that protrudes downward, and the protrusion of the underline portion is curved more gently than the protrusion of the upper wire portion. A slope protection method according to any one of . The slope protection method according to any one of claims 1 to 4, wherein the three-dimensional wire mesh also includes a base material bag containing a base material in a bag-like body. 6. The slope protection method according to claim 5, wherein a plurality of fin-like portions are arranged in the longitudinal direction on the outer surface of the base material bag.

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