JP2021076001A - Slope protection structure and slope protection method - Google Patents

Abstract

To provide a slope protection structure and a slope protection method which can enhance slope erosion prevention effect using a curable bag.SOLUTION: A slope protection structure includes a plurality of long mortar bags 1 which extend along a contour line on a slope face N and are arranged at intervals in a direction orthogonal to the contour line, and cloth forms 3 which are composed of a base material that permeate water and does not permeate cement particles and straddle between the plurality of mortar bags 1. The cloth forms 3 store at least cement therein.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, slopes cut to create roads in mountainous areas, and slopes on shores of rivers, lakes, dams, etc. (slopes of embankments, low water levels of rivers, etc.). The present invention relates to a slope protection structure and a slope protection method for protecting a certain slope.

Conventionally, as a cut soil slope protection work or a revetment work, a slope protection work has been carried out in which a slope protection tool composed of a long hardened bag and a net-like member to which a plurality of these hardened bags are mounted is installed on the slope. (For example, Patent Document 1).

In this slope protection work, slope protection tools are arranged so that the hardening bag follows the contour line so that the hardening bag blocks the runoff earth and sand, leaves from the surroundings, and the like. As a result, a small stepped vegetation base is eventually formed on the mountain side of the hardening bag, and the so-called small step effect that facilitates the growth of plants in this small step is exhibited. That is, the small step effect referred to here means an effect in which a growth base layer having a gentler slope than a slope is formed in a small step shape due to the accumulation of earth and sand, and plants can easily grow in this small step.

JP-A-2007-56606

However, in the above-mentioned conventional slope protection work, for example, when rainwater or the like infiltrates between the slope and the hardening bag, the frictional resistance between the soil particles decreases and the earth and sand move, and accordingly, the hardening bag Downward slippage (sliding to the valley side) may occur. Such a downward slip causes a reduction in the erosion prevention effect of the slope by the hardening bag.

The present invention has been made in consideration of the above-mentioned matters, and an object of the present invention is to provide a slope protection structure and a slope protection method capable of enhancing a slope erosion prevention effect using a hardening bag.

In order to achieve the above object, the slope protection structure according to the present invention includes a plurality of long curing bags extending along the contour lines on the slope and arranged at intervals in the direction orthogonal to the contour lines. It is composed of a material that allows water to pass through and does not allow cement particles to pass through, and includes an injection formwork that straddles the plurality of the hardening bags, and the injection formwork contains at least cement inside the injection formwork (claim 1). ..

In the slope protection structure, a fixing member for fixing the injection form to the ground is placed at a position where both the injection form and the curing bag penetrate, or the injection form is penetrated. It may be placed at a position where it can be supported from below without penetrating the curing bag (claim 2).

The slope protection structure extends along the contour line on the slope, is arranged at intervals in the direction orthogonal to the contour line, and includes a plurality of long consumable bags containing a material that creates a gap inside the slope protection structure. The injection form may also span a plurality of the consumable bags (claim 3).

In the slope protection structure, the injection form has a vertical flow path portion extending so as to vertically traverse a plurality of curing bags in a plan view and a direction in which the injection form is separated from the vertical flow path portion in a state of communicating with the vertical flow path portion. It may have a lateral flow path portion extending to (Claim 4).

On the other hand, in order to achieve the above object, the slope protection method according to the present invention is used when a plurality of long hardened bags extending along the contour line are arranged on the slope at intervals in the direction orthogonal to the contour line. After the arrangement, the injection formwork made of a material that allows water to pass through and does not allow cement particles to pass through is made to straddle the plurality of the hardening bags, and at least cement is contained therein (claim). 5).

In the slope protection method, after arranging the cured bag on the slope, the injection form may be arranged so as to straddle the plurality of the cured bags, and cement may be injected into the injection form (claim). 6).

In the slope protection method, the hardened bag is arranged on the slope by laying a holding member that holds a plurality of the hardened bags in advance on the slope, or on the holding member after laying on the slope. This may be done by holding the cured bag (claim 7).

In the present invention, a slope protection structure and a slope protection method capable of enhancing the slope erosion prevention effect using a hardening bag can be obtained.

That is, in the slope protection structure and the slope protection method of the invention according to each claim of the present application, the injection form straddling the curing bag holds the curing bag so as not to move from the place (so to speak, a state of holding or pressing against the slope). Because of the friction between the curing bag and the injection formwork, the curing bag is less likely to slip down, which in turn enhances the effect of preventing erosion of the slope and the effect of suppressing surface collapse and protrusion of the cured bag. Is possible.

The slope protection structure of the invention according to claim 2 not only makes it possible to reduce the number of fixing members such as anchor pins used for fixing the curing bag, but also integrates the cloth formwork, the curing bag and the slope. , It is possible to prevent the cured bag from slipping downward with respect to the cloth formwork and the slope.

In the slope protection structure of the invention according to claim 3, the injection form is made to straddle the curing bag and the consumable bag, and the shape of the curing bag hardly changes after the construction, whereas the consumable bag has the contents. It withers due to the outflow of substances, etc., and with this withering, the weight of the injection form becomes relatively large on the curing bag, which causes the injection form to hold the curing bag (particularly the pressing force). And frictional force) will increase, so that the effect of preventing erosion of the slope will improve over time.

In the slope protection structure of the invention according to claim 4, for example, adjacent injection formwork can be connected to form a simple legal frame to improve slope protection.

In the slope protection method of the invention according to claim 6, the curing bag is first placed on the slope and then the injection form is provided. If this order is reversed, the injection form interferes with the placement of the hardening bag. However, such inconvenience does not occur, and efficient construction can be performed.

In the slope protection method of the invention according to claim 7, since the curing bag is installed by using the holding member, the installation of the curing bag can be simplified.

(A) is a perspective view showing the structure of the slope protection structure according to the embodiment of the present invention, and (B) is a perspective view showing the structure of a main part of the slope protection structure. It is a vertical cross-sectional view which shows the structure of the slope protection structure. It is a perspective view which shows the structure of the holding member of the slope protection structure. (A) is an explanatory view schematically showing an example of an injection formwork of the slope protection structure, and (B) and (C) are explanatory views showing a modification example of the injection formwork, respectively.

Embodiments of the present invention will be described below with reference to the drawings.

The slope protection structure shown in FIG. 1 (A) is constructed on the slope N in order to protect and green the slope N (see FIG. 2), which is an example of the slope.

As shown in FIG. 1 (A), the slope protection structure of this example extends along the contour line on the slope N and is spaced in the inclination direction of the slope N (the direction orthogonal to the contour line). A plurality of long mortar bags (an example of a hardening bag) 1 and a base material bag (an example of a consumable bag) 2 to be arranged, and a plurality of cloths extending in an inclined direction of a slope N straddling each of the bags 1 and 2. A mold (an example of an injection mold) 3 is provided.

As shown in FIG. 3, the mortar bag 1 is formed by accommodating a dry mortar (an example of a curing material that is cured by water absorption or moisture absorption) 1b that is cured by water absorption in a long (elongated tubular) bag-shaped body 1a. , It was obtained with both ends of the bag-shaped body 1a closed, and a material that creates voids in the bag-shaped body 1a (for example, a material such as a base material that decreases over time due to elution of fertilizer components) is contained. Since it is not used, it is possible to increase the strength. The dry mortar 1b of this example is a mixture of cement and granular sand as an aggregate, but the aggregate constituting the dry mortar 1b is not limited to sand, but vermiculite, perlite (pumice stone), or the like is used. be able to. The substance to be contained in the bag-shaped body 1a can be a cured material that is cured by water absorption or moisture absorption, or a cured material having high strength can be obtained by mixing the cured material with an aggregate and storing the material. Further, a reinforcing material such as steel fiber may be mixed with the dry mortar so that the effect of improving the strength of the cured mortar bag 1 can be obtained.

Here, the bag-shaped body 1a can be formed by using a sheet-shaped body having water permeability without passing through the dry mortar 1b (cured material), and the material thereof is, for example, a non-woven fabric, felt, or cloth (woven fabric). Cloth), knitted fabrics, felt cloth, water-decomposable plastics, thin cotton and the like.

Further, the bag-shaped body 1a may have either a single structure or a multiple structure. Specific examples of the multi-layer structure include high-strength fibers (synthetic fibers such as polyethylene and polyester manufactured to be high-strength for industrial materials) and high-strength fibers between the inner bag and the outer bag made of the above materials. (Glass fiber, carbon fiber, etc.) are arranged to form a triple structure in which the strength of the bag-shaped body 1a in the longitudinal direction is increased, or a double structure in which either the inner bag or the outer bag is eliminated from this triple structure. It is conceivable to make it a structure.

As shown in FIG. 3, the base material bag 2 is obtained by accommodating the base material 2b in a long (elongated tubular) bag-shaped body 2a and then closing both ends of the bag-shaped body 2a. Is. The bag-shaped body 2a can be formed by using a sheet-shaped body having water permeability without passing through the base material 2b, and the same material as the bag-shaped body 1a can be used as the material. The base material 2b may be a vegetation base material containing, for example, a seed of a plant for greening (vegetation seed), a growth auxiliary material (water retention material, fertilizer, etc.), a soil conditioner, or the like. Other normal base materials may be used, and further, a vegetation base material and a normal base material may be mixed. In any case, the amount is reduced over time and voids are formed inside the bag-shaped body 2a. The resulting material. The vegetation base material includes, for example, a material containing vegetation seeds mainly composed of vermiculite, a surface soil seed bank, and specifically, a ground near a slope protection target area (greening target area). Examples thereof include those obtained by appropriately mixing growth auxiliary materials such as peat moss, bark compost and water retention material with the surface soil containing vegetation seeds such as forests. In this case, the plant can be surely introduced in a streak pattern. In addition, the normal base material includes a base appropriately selected from materials that do not harm vegetation, such as wood chips, agricultural and marine waste (shells, crab shells, fruit scraps, etc.), paper sludge, and the like. The material is mentioned.

Then, as shown in FIG. 3, the mortar bag 1 and the base material bag 2 are held (mounted) on a net-shaped holding member (an example of a net-shaped, sheet-shaped, or mat-shaped holding member) 4 having a substantially rectangular shape. Will be done. The holding member 4 has accommodating portions 5 at appropriate intervals in the longitudinal direction, and the holding member 4 of this example is, for example, a member having a width of 1 m and a vertical length of 5 to 10 m, and the accommodating portion 5 has an accommodating portion 5 in the vertical direction. It is provided at intervals of about 30 cm. That is, in FIG. 3, a part of the holding member 4 is shown. Then, the mortar bag 1 or the base material bag 2 is independently housed in each storage section 5. In the example shown in FIGS. 1 to 3, the mortar bag 1 is housed in the accommodating portion 5 (every two), and the base material bag 2 is accommodated in the remaining accommodating portion 5. .. The accommodating portion 5 is formed in a bag-like shape, a tubular shape, or a pocket shape having a size capable of accommodating the mortar bag 1 or the base material bag 2, and each of the bags 1 and 2 is one end of the accommodating portion 5. It is inserted into the inside from the side, whereby each bag 1 and 2 is held by the holding member 4.

Here, the holding member 4 uses fibers having high durability (for example, fibers such as nylon, polyester, aramid, carbon, glass, polyacetal, etc.) or corrosive fibers (for example, fibers such as palm), and has a mesh size of 5 to 10 mm. It may be molded to a certain extent, or both of these (durable fibers and corrosive fibers) may be superposed. Further, in order to improve the strength, a wire mesh (for example, a hexagonal wire mesh or a lath wire mesh) may be superposed on the holding member 4.

On the other hand, the cloth formwork 3 is made of a woven cloth having a mesh that allows water (or air) to pass through and does not allow cement particles to pass through, and has flexibility, and the inside thereof is for circulating cement fluid. It is a flow path. For the woven fabric, fibers with strong tensile strength such as carbon fiber are used, and while the cement particle size is 20 μm, the mesh size is approximately 0.001 μm (1 nm) (about 1/20000 of the cement particle size). It is preferable to use a woven fabric having a mesh size of).

Hereinafter, the slope protection method for carrying out the steps (1) to (6) for constructing the slope protection structure will be described together with the explanation of the slope protection structure of this example.

(1) First, a state in which a plurality of slope protection tools D (see FIG. 3) provided with a mortar bag 1, a base material bag 2 and a holding member 4 are laid vertically and horizontally on a slope N whose surface has been leveled in advance. To do.

In this laying (arrangement of the bags 1 and 2 on the slope N), the holding members 4 in which the bags 1 and 2 are housed in the accommodating portion 5 and integrated in advance are fixed members such as anchor pins (not shown). The bags 1 and 2 may be laid on the slope N by placing the bags 1 and 2 in the accommodating portion 5 of the holding member 4 after laying only the holding member 4 on the slope N first. It may be done by integrating.

At this time, it is necessary to give each bag 1 and 2 appropriate flexibility so that each bag 1 and 2 adhere to the slope N without a gap due to its own weight and follow the contour line. It is desirable in terms of obtaining the above, and it is also desirable in terms of improving the landscape. For each base material bag 2, fixing members 6 (see FIG. 2) such as a set nail are placed at appropriate intervals in the longitudinal direction and fixed to the slope N, and the same applies to the mortar bag 1. In addition, it is fixed to the slope N by driving a fixing member (not shown) such as an anchor pin using a deformed steel bar.

Further, as shown in FIG. 2, in this example, a sheet-shaped member 7 configured to pass water and plant buds and roots is provided under the holding member 4 by an appropriate means such as sticking. The sheet-shaped member 7 may be formed by using, for example, biodegradable material such as rayon, pulp fiber, synthetic resin, soluble material or water-decomposable material, and vegetation seeds, fertilizer, soil conditioner, etc. A vegetation base material containing an appropriately selected water-retaining material or the like is attached by a water-soluble glue material, whereby the sheet-like member 7 carries the vegetation base material (at least a state in which plant seeds are dispersed and held). It is desirable to configure it so that The sheet-shaped member 7 can also be formed by thinly stretching a thin cotton made of rayon.

Here, the sheet-shaped member 7 and the holding member 4 may be directly fixed by sticking or the like, but for example, after the sheet-shaped member 7 and the holding member 4 are arranged on the slope N in a laminated state. , Anchor pins and other fixing members (not shown) may be placed to lay and fix both on the slope N.

(2) A continuous cloth formwork 3 extending in the inclined direction is provided so as to straddle all the bags 1 and 2 arranged at intervals in the inclined direction of the slope N (direction substantially orthogonal to the contour line). A plurality of these connected cloth formwork 3 are provided at intervals in a direction substantially along the contour line.

Here, the "connecting cloth formwork 3" may be one (relatively long) cloth formwork 3 from the beginning, or some (relatively short) cloth formwork 3 having an arbitrary length. It may be connected to one so as to be. In the latter case, the ends of the cloth formwork 3 are connected to each other, but this connection can be performed with one of the ends of the cloth formwork 3 inserted into the other, as appropriate. It can also be carried out using a connecting pipe (for example, a vinyl chloride pipe), and in any case, the cement fluid that will be circulated in the cloth formwork 3 in a later step is prevented from leaking from the connecting portion. It is desirable to.

Further, the arrangement of the one-joint cloth formwork 3 is performed, for example, after the end portion (upper end portion) of the one-joint cloth formwork 3 wound in a roll shape is fixed to the slope N by placing an appropriate fixing member. , It is conceivable to develop the roll-shaped cloth formwork 3 toward the valley side. Then, in this example, the cloth formwork 3 is arranged so as to pass through the center of each slope protection tool D (see FIG. 3) in the left-right direction (see FIG. 1B).

(3) Cement fluid is poured from the upper (mountain side) end (opening) of each connected cloth formwork 3 and filled into each cloth formwork 3.

At this time, if the lower end (valley side) of the connecting cloth formwork 3 is open, it is closed in advance. This occlusion can be performed, for example, by suturing, crimping, binding, or the like using an appropriate member or device.

The cement fluid is cement milk (consisting of water, cement and, if necessary, a cement admixture) or mortar (containing at least water, cement and fine aggregate) with a W / C ratio of about 10 to 800%. Yes, an appropriate one is used depending on the situation in consideration of the ease of adapting to the unevenness of the slope N and the fluidity, and is not limited to the above range. Then, this cement fluid can be pumped into the hose by, for example, a pump for pumping (for example, a pump for pumping mortar having a discharge capacity of 30 L / min or more), and filled into the cloth form 3 from the nozzle at the tip of the hose. Good.

(4) After waiting for the excess water to be automatically discharged to some extent by gravity from each cloth formwork 3 containing the cement fluid (the cloth formwork 3 is reduced), the cement fluid is again made into the cloth mold. The procedure of filling the frame 3 is repeated until each cloth formwork 3 is not reduced.

That is, as described above, since the cloth formwork 3 is made of a woven cloth having a mesh that allows water to pass through and does not allow cement particles to pass through, excess water is discharged from each cloth formwork 3 containing the cement fluid. However, the cement particles will remain in the cloth formwork 3.

The excess water discharged from the cloth formwork 3 is supplied to the mortar bag 1 straddling the cloth formwork 3, and the mortar bag 1 hardens without waiting for water absorption / moisture absorption from the slope N and rainfall. Therefore, this process also contributes to the early stabilization of slope N.

When this step is completed, the cloth formwork 3 should be brought into close contact with the outer surfaces of the mortar bag 1 and the base material bag 2 so that there is as little gap as possible between the cloth formwork 3 and the slope N. preferable. Since the cloth formwork 3 is a woven fabric, it is easily deformed, and if the cement fluid to be put therein is provided with appropriate fluidity, the cloth formwork 3 is combined with the unevenness of the slope N. It will be easier to carry out the construction along the above, and by extension, it will have an excellent surface layer collapse prevention function.

Here, the cement component is strongly alkaline at pH 12.5, and the excess water discharged from the cloth formwork 3 can affect the vegetation. Further, there is a possibility that alkaline mortar may flow out from the mortar bag 1 due to the supply of water to the mortar bag 1 due to rainfall or the like. Therefore, in order to suppress the influence of such excess water and mortar, it is preferable to neutralize it. Specifically, for example, a long neutralizing bag containing a neutralizing agent (an example of a consumable bag). Can be held in the holding member 4 by accommodating the material in the accommodating portion 5, the neutralizing agent is mixed with the cement fluid, the neutralizing agent is supported on the cloth mold 3, and the neutralizing agent is sprayed on the slope N. ..

(5) Before or after the cement fluid in the cloth form 3 is completely solidified, a fixing member 8 such as an anchor pin is directly placed in the center of the cloth form 3, for example (see FIG. 1 (B)).

In particular, if the timing of placing the fixing member 8 with respect to the cloth formwork 3 is before the cement fluid in the cloth formwork is completely solidified, the casting of the fixing member 8 itself receives a large resistance from the cement fluid. It can be easily performed without any trouble, and the cloth formwork 3 and the fixing member 8 placed on the cloth formwork 3 after the cement fluid in the cloth formwork 3 has solidified have a structure that is firmly integrated. Further, the inventors have confirmed that it is possible to prevent the leakage of the cement fluid from the cloth formwork 3 even if the fixing member 8 is placed.

Then, the fixing member 8 for fixing the cloth formwork 3 to the slope N (ground) is placed at a position where both the cloth formwork 3 and the mortar bag 1 penetrate, or is shown in FIG. As described above, if the cloth formwork 3 is penetrated and the mortar bag 1 is placed at a position that can be supported from below (valley side) without penetrating the mortar bag 1, the number of fixing members used for fixing the mortar bag 1 can be reduced. Not only is it possible to integrate the cloth formwork, the curing bag and the slope, and it is possible to prevent the cloth formwork and the curing bag from slipping downward with respect to the slope.

(6) When the cement fluid contained in the internal space of each cloth formwork solidifies, the slope protection structure is in a state of being built on the slope N, whereby the slope protection method is completed. ..

In the slope protection structure of this example constructed as described above, the cloth mold 3 straddling the mortar bag 1 holds the mortar bag 1 so as not to move from the place (so to speak, a state of holding or pressing against the slope). Because of the friction between the mortar bag 1 and the cloth mold 3, the mortar bag 1 is less likely to slip down, which in turn prevents the slope N from eroding, causing surface collapse and protrusion of the mortar bag 1. It is possible to enhance the suppressing effect.

Further, in this example, the cloth formwork 3 straddles the mortar bag 1 and the base material bag 2, and the shape of the mortar bag 1 hardly changes after the construction, whereas the base material bag 2 has almost no change. It is reduced and withered due to the outflow of contents. Therefore, even if the weight of the cloth mold 3 is applied to the mortar bag 1 and the base bag 2 almost evenly at the time of construction, the weight of the cloth mold 3 becomes relative as the base bag 2 withers. As a result, the force (particularly pressing force and frictional force) for the cloth mold 3 to hold the mortar bag 1 is increased, so that the effect of preventing erosion of the slope and the like can be obtained. It will improve over time.

Moreover, in this example, as shown in FIG. 2, since the mortar bag 1 is thicker in the vertical direction than the base material bag 2, the weight of the cloth mold 3 is relatively large and easily hung on the mortar bag 1. Also, the force with which the cloth mold 3 holds the mortar bag 1 is increased, and the erosion prevention effect of the slope is enhanced.

If the mortar bag 1 is displaced downward, the vegetation base that accumulates on the mountain side of the mortar bag 1 may collapse due to vibration or the like caused by the downward movement, and the small step effect of this vegetation base may be impaired. Since the downward movement of 1 is prevented, it can be expected that the small step effect (greening) due to the vegetation base deposited on the mountain side of the mortar bag 1 can be ensured.

Further, in this slope protection method in which excess water can be discharged from each cloth formwork 3 containing the cement fluid, the strength of the cloth formwork 3 after the solidification of the cement fluid is prevented from being lowered, and the strength is increased. Not only can this be done, but the water-cement ratio of the cement fluid until it is filled (accommodated) in the cloth formwork 3 is increased to increase its fluidity, and the speed at which the cement fluid is filled into the cloth formwork 3 If it is increased, it will be possible to shorten the construction time.

At the same time, if the cloth formwork 3 of this example is used, all the surplus water of 40% or more is discharged to the outside of the formwork regardless of the water-cement ratio (W / C) of the cement milk. water-cement ratio of the cement milk to stay within are automatically adjusted 35% required for the hydration reaction in about 40% slightly above, the results of experiments to date, readily 4 weeks compressive strength 80 N / mm ² It has been confirmed that the above expression is possible. Such a high 4-week compression strength leads to a dramatic increase in the time required for neutralization, and it is possible to prolong the time required for maintenance and repair, which is a dramatic increase. It is also possible to extend the service life.

On the other hand, in the slope protection method of this example, the mortar bag 1 and the base material bag 2 are placed on the slope N first, and then the cloth formwork 3 is provided. If this order is reversed, the cloth formwork 3 is provided. However, it interferes with the arrangement of the bags 1 and 2, but such inconvenience does not occur, and efficient construction can be performed.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be variously modified and implemented without departing from the gist of the present invention. For example, the following modification examples can be given.

The slope protection structure and slope protection method in the above embodiment are not limited to slope N, and may be used and constructed on flat ground or the like.

In the above embodiment, the mortar bag 1 in which the dry mortar 1b is contained in the bag-shaped body 1a is used, but the present invention is not limited to this, and for example, cement-based materials such as dry cement containing no aggregate and other hardening such as gypsum are used. The bag (hardened bag) in which the material is housed in the bag-shaped body 1a may be used instead of the mortar bag 1.

A water reducing agent may be mixed with the cement fluid contained in the cloth formwork 3. Further, an admixture such as aramid fiber or nanocellulose may be mixed in the cement fluid, and in this case, the tensile strength of the cloth formwork 3 is dramatically improved.

As the cement fluid, concrete containing at least water, cement and coarse aggregate may be used. Further, in the above embodiment, the cement housed in the cloth mold 3 is made to take the form of a cement fluid containing at least water and cement, but the present invention is not limited to this, and when the cement is housed in the cloth mold 3. In the form of, for example, dry powder cement, dry mortar (a mixture of granular sand, vermiculite, pearlite (light stone) and other aggregates), and granular cement, the cement is housed in the cloth formwork 3. Later, the cement may be hardened by natural water absorption / moisture absorption due to watering or rainfall on the cloth mold 3.

The pouring of cement milk (cement fluid) into the cloth formwork 3 is not limited to the one using a pump for pumping. For example, cement milk (cement fluid) is prepared on the mountain side of the cloth form 3 and cement is cemented by its own weight. The milk may be poured into the cloth formwork 3.

In the example of FIG. 1B, the cloth formwork 3 is arranged so as to pass through the center of each slope protection tool D in the left-right direction, but the present invention is not limited to this, and for example, the cloth formwork 3 is arranged so as to pass through each slope protection tool D. It may be arranged so as to pass through either one end side in the left-right direction of. In this case, the overlapping portion of the slope protection tools D adjacent to the left and right can be pressed by the cloth formwork 3 to prevent the portion from curling. Here, in the mortar bags 1 of the slope protection tools D adjacent to each other on the left and right, the end of one mortar bag 1 may be overlapped with the mountain side of the end of the other mortar bag 1 or may be overlapped with the upper side. Good. This also applies to the base material bags 2.

Further, for each slope protection tool D, the number of cloth formwork 3 arranged on the slope protection tool D is not limited to one, and may be two or more, or slope protection in which the cloth formwork 3 is not arranged on the slope protection tool D. Tool D may be provided.

As shown in FIG. 4A, the cloth formwork 3 in the above embodiment has a vertical flow path portion 3a extending so as to vertically traverse the slope protection tool D (transverse a plurality of mortar bags 1) in a plan view. However, the present invention is not limited to this, for example, as shown in FIG. 4B, a vertical flow path portion 3a extending so as to vertically traverse the slope protection tool D (transverse a plurality of mortar bags 1) in a plan view. It may have a horizontal flow path portion 3b extending in a direction (left and right) away from the vertical flow path portion 3a in a state of communicating with the vertical flow path portion 3a. The lateral flow path portions 3b may be connected to each other so that the connected cloth formwork 3 has a grid pattern (in FIGS. 4A and 4B, the illustrations of the bags 1 and 2 are omitted). .. From the viewpoint that the cloth formwork 3 is brought into close contact with the slope N as much as possible, it is desirable that the lateral flow path portion 3b is provided at a position avoiding the mortar bag 1 and the base material bag 2. Further, for example, when the slope N has a steep slope, an appropriate portion may be temporarily fixed by nailing or the like in order to prevent the cloth formwork 3 from slipping down before being fixed.

Further, the vertical flow path portion 3a of the cloth formwork 3 may extend obliquely with respect to the inclination direction of the slope N. Further, the horizontal flow path portion 3b of the cloth form 3 may be extended along the contour line, or may be extended so as to be located on the valley side (lower side) as the distance from the vertical flow path portion 3a increases. In this case, the cement fluid can be more easily filled in the lateral flow path portion 3b.

In this way, the number and arrangement, thickness, spacing (pitch), and direction of the vertical flow path portion 3a and the horizontal flow path portion 3b provided in the cloth formwork 3 can be changed in various ways. For example, the cloth formwork 3 has a vertical flow path. When the portion 3a is provided, the vertical flow path portion 3a may be in a zigzag shape or the like.

However, from the viewpoint of rational slope protection, the distance between the vertical flow path portions 3a adjacent to each other in the left-right direction (the direction in which the contour lines extend) of the cloth formwork 3 is preferably 50 cm to 5 m, more preferably 1 m to 2 m. The vertical and horizontal thicknesses of the cloth formwork 3 are preferably 3 cm to 20 cm, more preferably 5 cm to 10 cm.

Further, when the lower end (valley side end) of each cloth formwork 3 does not reach the buttock with a gentle slope, as shown in FIG. 4C, it extends along the contour line and each cloth formwork 3 By providing the support 9 that supports the lower end portion (valley side end portion) of the cloth formwork 3, it is possible to prevent the cloth formwork 3 from slipping (in FIG. 4C, the illustrations of the bags 1 and 2 are omitted. It is done). The support 9 shown in FIG. 4C is limited to, for example, one of the cloth formwork 3 having the vertical flow path portion 3a is used sideways along the contour line. Instead, for example, the support 9 may be formed of a base material bag 2 or other long consumable bag, or lateral flow path portions 3b are provided on the left and right sides of the lower end portion of each cloth formwork 3, and adjacent cloth formwork pieces are provided. The lateral flow path portions 3b of 3 may be connected to each other to form.

The cloth formwork 3 may be integrated with the holding member 4, the mortar bag 1 or the base material bag 2 so that the cloth formwork 3 before injecting the cement fluid becomes a part of the slope protection tool D. As a method of this integration, for example, sewing, adhesion using an adhesive / adhesive tape, crimping, binding / connection using a string-like body or other appropriate members, and the like can be considered.

The holding member 4 for holding each of the bags 1 and 2 is not limited to a net-shaped member, but may be a sheet-shaped or mat-shaped member, or a plurality of these members may be combined by laminating or the like. For example, in the above-described embodiment, the sheet-shaped member 7 shown in FIG. 2 is described as being different from the holding member 4, and the sheet-shaped member 7 is not described as the “holding member”, but the sheet-shaped member 7 is described. It can also be considered that the member 7 and the holding member 4 constitute one "holding member" that holds each of the bags 1 and 2.

Further, in the above step (1), since the holding members 4 are used to install the bags 1 and 2, the installation of the bags 1 and 2 can be simplified, but the holding member 4 is not limited to this. Each bag 1 and 2 may be individually installed on the slope N without using.

Although the holding member 4 shown in FIG. 3 is provided with the accommodating portion 5, the accommodating portion 5 may not be provided, and for example, the bags 1 and 2 may be bound to the holding member 4 with a rope, a wire, or the like.

In the example shown in FIG. 3, the mortar bag 1 is housed in one of the three storage parts 5, and the base material bag 2 is housed in the remaining storage part 5, but the present invention is not limited to this, and one in two. The mortar bag 1 is housed in the storage part 5, and the base material bag 2 is stored in the remaining storage part 5, or the mortar bag 1 is stored in all the storage parts 5 without using the base material bag 2. The ratio of accommodating the bag 1 and the base material bag 2 can be changed as appropriate.

In the above embodiment, the number of the mortar bag 1 or the base material bag 2 to be accommodated in one accommodating portion 5 is limited to one, but the number of the mortar bags 1 or the base material bag 2 may be two or more. Then, in this case, a plurality of types of bags may be freely combined and accommodated in one accommodating portion 5, and for example, in order to promote the growth of plants in the vegetation base formed on the mountain side of the mortar bag 1. A fertilizer bag (an example of a consumable bag, not shown) or a base material bag 2 may be arranged (accommodated) at a position on the mountain side of the mortar bag 1 in the accommodating portion 5 for accommodating the mortar bag 1. In this fertilizer bag, for example, the contents of the base material bag 2 can be specialized for fertilizer.

Here, when a plurality of bags such as a hardening bag (for example, a mortar bag 1) and a consumable bag (for example, a base material bag 2, a neutralizing bag, and a fertilizer bag) are accommodated in one accommodating portion 5, each bag is fixed with a set nail or an anchor pin. It may be individually fixed to the slope N with a fixing member such as, or only a part of the bags may be fixed.

The fixing members 6, 8 and the like in the above embodiment may be used with different lengths depending on the situation of surface collapse. For example, the immovable layer is located at a depth slightly unreachable by a normal anchor pin in the ground. If so, it is possible to use an anchor pin (or anchor) that is long enough to reach it.

In the above slope protection method, in the step (5), the fixing member 8 is driven into the cloth formwork 3 and fixed to the slope N (see FIG. 1B), but the present invention is not limited to this, for example. In the above step (2), after the arrangement of the one-piece cloth formwork 3 and before the next step (3), for example, an overhanging portion having through holes (not shown) on the left and right sides of the one-piece cloth formwork 3. May be provided, and a fixing member such as an anchor pin may be placed so as to penetrate the through hole to fix the cloth formwork 3 to the slope N.

Needless to say, the above modified examples may be combined as appropriate.

1 Mortar bag 1a Bag-shaped body 1b Dry mortar 2 Base material bag 2a Bag-shaped body 2b Base material 3 Fabric mold 3a Vertical flow path part 3b Horizontal flow path part 4 Holding member 5 Storage part 6 Fixing member 7 Sheet-like member 8 Fixing member 9 Support D Slope protection tool N Slope

Claims (7)

Multiple elongated hardening bags that extend along the contour lines on the slope and are spaced at intervals in the direction orthogonal to the contour lines.
It is composed of a material that allows water to pass through and does not allow cement particles to pass through, and includes an injection formwork that straddles the plurality of the hardening bags.
The injection formwork has a slope protection structure in which at least cement is housed. A fixing member for fixing the injection form to the ground is placed at a position where both the injection form and the curing bag penetrate, or the injection form is penetrated and the curing bag is penetrated. The slope protection structure according to claim 1, wherein the slope protection structure is placed at a position where it can be supported from below. The injection form is provided with a plurality of long consumable bags extending along the contour line on the slope, spaced apart from each other in the direction orthogonal to the contour line, and containing a material that creates a gap inside. The slope protection structure according to claim 1 or 2, which also spans a plurality of the consumable bags. The injection form has a vertical flow path portion that extends so as to vertically traverse a plurality of curing bags in a plan view, and a horizontal flow path portion that extends in a direction that communicates with the vertical flow path portion and is separated from the vertical flow path portion. The slope protection structure according to any one of claims 1 to 3. It is made of a material that allows water to pass through and does not allow cement particles to pass through when or after arranging multiple long hardened bags extending along the contour lines on the slope at intervals in the direction orthogonal to the contour lines. A slope protection method in which an injection form straddles a plurality of the hardening bags and at least cement is contained therein. The slope protection method according to claim 5, wherein after arranging the cured bag on the slope, the injection form is arranged so as to straddle the plurality of the cured bags, and cement is injected into the injection form. The arrangement of the cured bag on the slope is performed by laying a holding member that holds a plurality of the cured bags in advance on the slope, or the holding member after laying on the slope holds the cured bag. The slope protection method according to claim 5 or 6.

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