JP2008115544A - Natural slope stabilizing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a natural slope stabilizing method which can effectively prevent the outflow of sediment from a depression when the depression is formed in a natural slope. <P>SOLUTION: In this natural slope stabilizing method, a bearing member 2, which is mounted on the head of each anchor 1 installed on the natural slope, is fastened, and the anchors 1 are connected together by means of a wire rope 3. In a location where the depression 13 is provided in a portion along the wire rope 3, a member for preventing the outflow of the sediment, for example, a rod-like member 11 is arranged along the wire rope 3, and held on a ground surface. Since the rod-like member 11 is arranged in such a manner as to fill the depression between the anchors, the action of preventing the outflow of the sediment can be effectively exerted on the depression even if the rope is lifted in the air. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a natural slope stabilization method for stabilizing a slope with a large number of anchors, bearing members attached to the anchor head, and a rope connecting between the anchor heads. The present invention relates to a natural slope stabilization method that can effectively prevent outflow.

A natural slope stabilization work in which a large number of anchors are installed on the slope, and a bearing member is attached to the head of each anchor to fasten it to give support pressure to the ground, and each anchor head is connected with a wire rope. The method can stabilize the slope by leaving the trees, so the natural slope is more stable in terms of environmental conservation and landscape compared to the glue frame construction method in which a grid frame made of concrete or mortar is installed on the slope. Excellent as a chemical method.
However, this natural slope stabilization method (simply called slope stabilization method) using anchors, bearing members, and wire ropes is a method that leaves trees and grass on the slope, so that the slope with the plant In this case, it is possible to prevent the outflow of earth and sand, but the slope is not partitioned by structures as in the case of the glue frame method. It is a weak point. In this case, the reinforcing ribs and wire ropes of the bearing member slightly contribute to prevention of the outflow of the surface soil, but it is difficult to capture a certain amount or more of the soil.

In order to prevent sediment discharge in this type of slope stabilization method, the present applicant has previously applied for a method for attaching a sediment discharge prevention member to a wire rope (Patent Document 1). In this patent document 1, as an example of the earth and sand outflow prevention member, for example, a disk-shaped one provided with a slit for fitting into a rope, a slit for fitting into a rope as a cylindrical mesh with a coarse mesh by iron wire And a rectangular plate provided with a large number of slits to form a comb-like shape and attached to a rope through a gap between teeth.
Japanese Patent Application Laid-Open No. 2004-324348, FIG. 3, FIG. 9, FIG.

By the way, it is common for the natural slope to have irregularities, and there are often depressions between the anchors, and the rope often floats in the air. In such a case, the sediment outflow prevention action of each sediment outflow prevention member of Patent Document 1 is not necessarily effective.
In addition, if a sediment runoff occurs in the depression on the slope during rainfall, the depression may extend in the slope inclination direction, and as a result, it may become a waterway groove during rainfall, which may further promote sediment discharge. There is.
Further, if the rope is floating in the air at the hollow portion, it is easy for an operator to get on the rope when entering the construction slope for maintenance of the slope, which disturbs the work.
The present invention has been made under the above background, and in a natural slope stabilization method for stabilizing a natural slope with an anchor, a bearing member and a rope, it is possible to effectively prevent sediment discharge and between the anchors. When there is a hollow in the rope and the rope floats in the air, it is possible to effectively prevent sediment from flowing out of the hollow and provide a natural slope stabilization method that does not interfere with the work. For the purpose.

The present invention for solving the above-mentioned problems is that a large number of anchors are installed on the slope, and a supporting member is attached to the head of each anchor to fasten it to give a supporting pressure to the ground, and between each anchor head In the natural slope stabilization method connected with a rope,
About the location which has a hollow in the part along the said rope of the ground, the earth and sand outflow prevention member is arrange | positioned along a rope, It is characterized by the above-mentioned.

  According to a second aspect of the present invention, in the natural slope stabilization method of the first aspect, the sediment discharge preventing member is a rod-shaped member.

  According to a third aspect of the present invention, in the natural slope stabilization method of the second aspect, the bar-shaped member is a thinned material or a steel pipe.

  According to a fourth aspect of the present invention, in the natural slope stabilization method of the second or third aspect, the rod-shaped member is engaged with the rope so that the rope can be pushed down.

  According to a fifth aspect of the present invention, in the natural slope stabilization method according to the second to fourth aspects, another bar-shaped member is stacked on the bar-shaped member disposed in the recess.

  Claim 6 is a natural slope stabilization method according to claims 2 to 5, wherein as a means for holding the bar-like member on the ground, a pin having a horizontally projecting head is pressed against the upper surface of the bar-like member by the head. It is characterized by being inserted into the ground.

In the natural slope stabilization method of the present invention, the sediment discharge prevention member is arranged along the rope so as to fill the depression between the anchors, so that even if the rope is floating in the air, the sediment discharge prevention effect in the depression is effectively obtained. Can fulfill. In the case where sediment outflow occurs in the depression on the slope during rainfall, the depression extends in the slope inclination direction and becomes a waterway groove, which may further promote sediment outflow, but the sediment outflow prevention member prevents this.
The rod-shaped member of claim 2 is suitable as a sediment discharge preventing member disposed along the rope.
In particular, when thinned wood or steel pipe is used as the rod-like member as in claim 3, by using a material having an appropriate thickness, it is possible to effectively achieve the sediment outflow prevention action.
Further, when the rod-like member is engaged with the rope so that the rope can be pushed down as in claim 4, the rod-like member having a certain weight such as a thinned material or a steel pipe is used to float in the air. The rope can be sunk, and when the operator enters the construction slope for maintenance of the slope, the operator does not get caught and does not disturb the work. Moreover, since the tension of the rope is increased by pushing down the rope, this is preferable in terms of the slope stabilization action of the rope.

  When the bar-like members are arranged in a stacked manner as in claim 5, not only the lower-side bar-like member can prevent the sediment from flowing out of the depression, but also the upper-side rod-like member prevents the sediment from flowing out after the depression is filled. It is done.

  According to the method of inserting a pin having a horizontally projecting head into the ground in such a manner that the upper surface of the rod-like member is pressed by the head, the rod-like member can be easily held on the ground.

  Hereinafter, embodiments of the slope stabilization method of the present invention will be described with reference to FIGS.

  FIG. 1 (a) is a plan view of a slope where the slope stabilization method for suppressing sediment discharge according to one embodiment of the present invention is implemented, (b) is a cross-sectional view taken along the line AA in FIG. 1 and FIG. 2 is a part of FIG. FIG. As shown in these figures, this slope stabilization method is to install a large number of anchors 1 on the slope, and attach a supporting member 2 to the head of each anchor 1 to fasten it, thereby reducing the supporting pressure on the ground. This is a slope stabilization method in which the heads of the anchors 1 are connected by a rope, for example, a wire rope 3.

The detailed structure of the anchor head will be described. As shown in FIG. 3, the bearing member 2 is made of a steel plate, and a cylindrical body 7 is fixed vertically to a bottom plate 6 having an anchor insertion hole in the center. A reinforcing rib 8 provided with a notch 8a for allowing the wire rope 3 to pass therethrough is welded and fixed between the body 7 and the bearing member 2 is arranged on the head of the anchor 1 placed on the ground. The nut 10 is screwed into the threaded portion 1a of the anchor head via the washer plate 9 and tightened to obtain a support pressure to the ground.
In this embodiment, the arrangement of the anchors 1 is such that three adjacent anchors 1 form a triangle, and one wire rope 3 is rotated around every three anchors 1 forming a triangle. 1 is connected. Specifically, the wire rope 3 contacts the outer periphery of the cylindrical body 7 through the notch 8 a of the reinforcing rib 8 of the bearing member 2. The interval between adjacent anchors 1 is, for example, about 2 m.

In the present invention, as shown in an enlarged view in FIG. 4, a member (sediment outflow prevention member) for preventing sediment outflow along the wire rope 3 at a portion where the recess 13 is present along the wire rope 3 on the ground. For example, rod-like members such as thinned wood and steel pipes are arranged and held on the ground. In the illustrated example, the thinning material 11 is used as the rod-shaped member.
As the thinning material 11, for example, a material having an outer diameter of about 100 mm and a length of about 1.5 m can be used. As a means for holding the thinned material 11 on the ground, a pin having a horizontally projecting head may be used. In the illustrated example, a pin 12 for holding a thinning material having a downward U-shaped head portion 12a bent downward in an inverted L shape is inserted into the ground, and the upper surface of the thinning material 11 is covered with the head portion 12a. Holding down. A folded portion of the head 12a is indicated by 12b. In the illustrated example, the outer diameter of the thinned material 11 is illustrated as being approximately the same as the depth of the recess 13, so the wire rope 3 comes near the upper end of the thinned material 11, but the thinned material 11 is located above the slope of the wire rope 3. (Right side in FIG. 4B), the wire rope 3 is positioned in the gap between the corner portion of the head 12a of the pin 12 and the thinned material 11. In the illustrated example, the thinned material 11 is held by pins 12 at two locations on both sides in the length direction.

  As described above, since the thinned material 11 arranged and held on the ground along the wire rope 3 at a place where the depression 13 is located, fills the depression 13, so that even if the wire rope 3 floats in the air, it prevents sediment from flowing out. As shown in FIG. 7 (a), the earth and sand 14 about to flow downward from above the slope is stopped and deposited on the slope upper side of the thinned material 11. In particular, in the event of a sediment outflow in the depression 13 on the slope during rainfall, as shown in FIG. 7 (b), the depression 13 becomes a channel-like groove 13 ′ extending in the inclination direction of the slope as shown by a two-dot chain line. There is a possibility that sediment discharge will be further promoted, but the thinning material 11 prevents this. In FIG. 7 (and FIG. 8 and FIG. 9 described later), the slope surface of the portion having no depression is indicated by S.

When the sediment runoff prevention member is arranged on a natural slope, it is appropriate to set the height for the sediment runoff prevention action to, for example, about 100 mm in height, but the thinning material 11 with an outer diameter of about 100 mm is easily available. The thinning material 11 is appropriate as it is easy to secure the height of the sediment discharge prevention member.
Moreover, about the length, when the anchor interval is set to 2 m, for example, the length of the thinning material 11 arranged along the wire rope 3 is less than 2 m, but the thinning material 11 of about 2 m is easily available. Also in this respect, the thinning material 11 is suitable as a sediment discharge preventing member. However, the outer diameter and length of the thinned material 11 are not particularly limited. In addition, the length of the thinning material 11 does not need to cover the full length of an anchor space | interval, and sets length appropriately by the condition of a slope.
Further, since the surface layer of the natural slope is soft, the thinning material 11 having a moderate weight is well adapted to the ground when placed on the slope, and this point is also suitable as a sediment discharge preventing member along the wire rope 3.
In addition, it is a common scene that a tree trunk lies on a natural slope. Compared with a metal earth and sand runoff prevention member, the thinned wood 11 matches the natural slope without a sense of incongruity. It is suitable as an earth and sand outflow prevention member to be installed.
As described above, the thinning material 11 has an appropriate outer diameter and length in terms of preventing sediment outflow and is placed on a natural slope as a sediment outflow prevention member that is placed and held on the ground along the wire rope 3. It is suitable in terms of weight as well as it matches the natural slope without any sense of discomfort, and it is extremely easy to obtain.
In addition, when a worker or the like enters the construction slope for maintenance of the slope, etc., it is easy to get caught in the wire rope 3 floating in the air without conspicuously in the place of the depression 13, but the thinned material 11 is particularly noticeable. It is possible to prevent the user from getting caught without paying attention. This can also be said at the time of work for constructing the method of the present invention.

FIG. 5 shows an embodiment in which another thinning material 11 is arranged on the thinning material 11 arranged on the bottom surface of the recess 13 in the embodiment of FIG.
In the illustrated example, the thinning material holding pin 12 having the downward U-shaped head portion 12a is inserted into the ground in the same manner as in the above embodiment, but the folded portion 12b of the downward U-shaped head portion 12a of the pin 12 is The upper thinning material 11 can be stacked and held so as to be longer. The wire rope 3 is arranged in a gap formed between the upper and lower thinning materials 11 and the pins 12.

  In this embodiment, initially, the thinning material 11 on the lower side prevents the sediment from flowing out, and after the depression 13 is filled, the thinning material 11 on the upper side prevents the sediment from flowing out, as shown in FIG. The thinning material 11 above and below deposits the earth and sand 14.

In the embodiment of FIG. 5, the bottom surface of the depression 13 at the wire rope position is shown to be substantially flat, but the bottom surface may be curved as shown in FIG. 6. In this case, a gap 16 is formed below the lower thinning material 11, but even in such a case, it is still possible to prevent sediment discharge by a method of filling the gap 16 with some means, or a method of leaving it as it is. Is possible.
That is, for example, by burying the gap 16 with soil at the time of construction or by blocking the gap 16 with a plate member or another member, it is naturally possible to avoid the loss of the sediment outflow prevention function. Even if the gap 16 remains as it is, the effect is small if the gap 16 is narrow, even if the gap 16 is slightly wide, the thinned material 11 sinks, or the gap 16 is filled with earth and sand, fallen leaves, twigs, etc. Since it is also possible that the gap disappears or becomes narrow due to various causes, it is conceivable that the gap 16 remains. FIG. 9 shows a situation in which the thinning material 11 above and below deposits earth and sand 14 in such a case.

FIG. 10 shows an embodiment in which the thinned material 11 is engaged with the wire rope 3 so that the wire rope 3 can be pushed down in the embodiment of FIG. In the illustrated example, a groove 11a in the length direction of the thinned material is formed on the lower surface of the thinned material 11, and the wire rope 3 is accommodated in the groove 11a.
As a result, the wire rope 3 floating in the air with the weight of the thinned material 11 can be sunk and placed on the bottom surface of the depression 13. Therefore, when the operator enters the construction slope for maintenance of the slope, the operator does not get caught in the wire rope 3 floating in the air, and does not interfere with the work.
Moreover, since the thinned material 11 works to increase the tension of the wire rope 3 by sinking the wire rope 3, it is preferable in terms of the slope stabilizing action of the wire rope 3.

  When the thinned material 11 is arranged in an overlapping manner as in the embodiment of FIG. 5, the thinned material length direction groove 11a is formed on the lower surface of the upper thinned material 11 as in the embodiment shown in FIG. When the wire rope 3 is accommodated in the groove 11a, it is effective to integrate the thinned lumber 11 up and down.

Modification examples of the pins for holding the thinned material 11 on the ground are shown in FIGS.
The pin 12 shown in FIG. 12A is obtained by simply bending the head 12a into an inverted L shape (a shape without a folded portion). When the pin 12 is inserted on the slope lower side (left side in FIG. 12 (a)) of the thinned material 11 as shown, the pin 12 restrains the thinned material 11 from moving downward on the slope and the thinned material 11 Since there is almost no movement above the slope, there is no problem even if it is a simple inverted L shape without a folded portion.
Further, as shown in FIG. 12 (b), the head 12a of the pin 12 may be arcuate. Thereby, holding | maintenance of the thinning material 11 becomes more reliable than the case of a simple reverse L-shape, and the movement of the thinning material 11 can be prevented.
Further, as shown in FIG. 12C, when the head portion 12a has a downward U-shape, the folded portion 12b may be lengthened and the folded portion 12b may also be inserted into the ground. Thereby, holding | maintenance of the thinning material 11 becomes still more reliable, and the movement of the thinning material 11 can be prevented.

In each of the above-described embodiments, the pin 12 is inserted beside the thinning material 11 and the thinning material 11 is held by the head 12a. However, as shown in FIGS. The thinned material 11 may be held on the ground by inserting a penetrating pin 15 penetrating through the ground.
This method using the penetrating pin 15 is particularly suitable in such a case because when the thinned material 11 is stacked vertically as shown in FIG.
Since the through pin 15 in the illustrated example has an inverted L-shaped head portion 15a, it can be prevented from coming off, but it may be a simple straight through pin that has no head coming off.
Even in that case, there is no particular problem because it is sufficient to restrain the movement of the thinned material 11 in the slope inclination direction. In some cases, it is possible to replace only the thinned material 11 without removing the through pin 15.

When the wire rope 3 is submerged with the thinned material 11 as shown in FIG. 10 (a), the wire rope 3 is accommodated in the groove 11a provided on the lower surface of the thinned material 11 as shown in FIG. The thinned material 11 may be held on the ground by inserting a penetrating pin 15 penetrating 11 into the ground. In this case, it is preferable that the width of the groove 11 a is widened so that the through pin 15 does not interfere with the wire rope 3. Further, the groove may be shifted from the center position in the width direction of the thinned material 11 so that the through pin 15 does not penetrate the groove.
In addition, when the thinned material 11 is stacked up and down as shown in FIG. 5 (a), the wire rope 3 is accommodated in the groove 11a provided on the lower surface of the upper thinned material 11 as shown in FIG. 14 (b), You may hold | maintain the up-and-down thinning material 11 on the ground by inserting the penetration pin 15 which penetrates the thinning material 11 into the ground.

  Further, as shown in FIGS. 15A and 15B, a simple method of binding the thinned material 11 and the wire rope 3 by binding the thinned material 11 and the wire rope 3 with an iron wire 17 or the like is adopted. May be. Since the wire rope 3 connected to the anchor 1 does not move, the thinned material 11 is held on the ground via the wire rope 3.

  In the embodiment, three anchors in a triangular arrangement are connected by a single wire rope 3. In this case, the end of the wire rope 3 closed to the triangle is usually shown in a simplified form in FIG. As such, they are connected via the turnbuckle 18. Therefore, the pin 12 may be inserted into the ground through a retaining ring 3 a provided at the end of the wire rope 3 in order to connect to the terbuckle 18. The pin 12 may be either one or both of the retaining rings 3a at both ends.

  In each of the above-described embodiments, the thinned material 11 is used as the rod-shaped member. However, a square steel pipe 11A can be used as shown in FIGS. 17 (a) and 17 (c), as shown in FIGS. A round steel pipe 11B can be used. (A), (b) is a diagram corresponding to FIG. 4 (b) (when arranged as in FIG. 4 (a)), (c), (d) is a diagram corresponding to FIG. 5 (b). (In the case where they are arranged in an overlapping manner as shown in FIG. 5A).

  Each of the above-described embodiments is a case where the anchors 1 are arranged in a triangle and the wire rope 3 forms a triangular mesh. However, as shown in FIG. The present invention can also be applied to a case in which the wire rope 23a in the slope inclination direction) and the wire rope 23b in the lateral direction (horizontal direction) perpendicular to the wire rope 23a form a lattice shape and form a square mesh. The illustrated bearing member 2 is circular.

FIG. 19 shows an embodiment in which a net 20 such as a wire mesh is laid in advance on a slope. The net 20 is engaged with the anchor 1. The construction of the anchor 1, the bearing member 2 and the wire rope 3 is the same as in the above-described embodiment.
In this embodiment, the thinned material 11 is arranged on the net 20 and held on the ground.
The thinning material 11 has the effect of preventing sediment discharge as described above.
In the embodiment shown in FIG. 19, the wire rope 3 may be omitted.

20 and 21 show a natural slope stabilization method using a folding screen-like member 31 with legs 31a as a sediment discharge prevention member. 20 is a perspective view of an essential part, FIG. 21 (a) is a sectional view (a figure corresponding to FIG. 4 (a)), and (b) is a plan view thereof.
As shown in the drawing, a folding screen-like member 31 with a leg is inserted along the wire rope 3 with the leg 31a inserted into the ground and held on the ground at a place where the depression 13 is present along the wire rope 3 on the ground. . A folding screen main body is shown by 31b. In that case, it arrange | positions so that the adjacent leg 31a may straddle the wire rope 3. FIG.
As a material of the folding screen main body 31b and the legs 31a of the folding screen-shaped member 31, steel material, plastic, wood, etc. can be used.

According to the above construction method, since the member for preventing sediment discharge (the folding screen member 31 with the legs) is a folding screen member bent in a zigzag as viewed from above, a sufficiently high sediment capturing effect can be obtained.
Moreover, since it is with a leg and the adjacent leg 31a straddles the wire rope 3, it engages with the wire rope 3 reliably.
Moreover, since the folding screen main body 31b pushes down the wire rope 3 and causes it to reach the bottom surface of the recess 13, the wire rope 3 does not float in the air and does not interfere with the work. Moreover, since the effect | action which raises the tension | tensile_strength of the wire rope 3 is carried out, it is preferable at the point of the slope stabilization effect | action of the wire rope 3. FIG.
In addition, the folding screen-like member 31 can be adjusted in width W (see FIG. 21B) by changing the degree of opening, which is advantageous in dealing with situations such as the spread of the depression 13.

22 and 23 show a natural slope stabilization method using a disk-like member 41 as a sediment discharge prevention member. 22 is a perspective view of the main part, FIG. 23 (a) is a sectional view (a figure corresponding to FIG. 4 (a)), and (b) is a plan view thereof.
As shown in the figure, this construction method is mainly used when there is a generally circular recess 13 ″ in a portion along the wire rope 3, and a disk-like member (or back of the back) is placed on the wire rope 3. In the embodiment, a leg 41a is provided on the bottom surface to be inserted into the ground, and the disk-shaped member 41 may be either solid or hollow. Plastic, wood, etc. can be used.

According to this construction method, when there is a generally circular recess 13 ″ along the wire rope 3, the earth and sand outflow prevention action at the recess 13 ″ can be effectively achieved.
Further, since the disk-shaped member 41 placed on the wire rope 3 pushes down the wire rope 3 and turns it on the bottom surface of the recess 13 ″, the wire rope 3 does not float in the air and does not interfere with the work. This is preferable in terms of stabilizing the slope of the wire rope 3.
As shown in the example, the leg 41a provided on the bottom surface is inserted into the ground so that it is firmly held on the ground. However, the disc-like member 41 placed in the circular recess 13 ″ does not move freely, so the legs 41a are not provided. May be.

  In the present invention, the earth and sand outflow prevention member disposed along the wire rope 3 in the recess is not limited to the above-described rod-like member, folding screen-like member, and disk-like member, and various other members can be used.

The slope which constructed the slope stabilization construction method of one Example of this invention is shown, (A) is a top view of a part of slope, (B) is AA sectional drawing of (A). FIG. 2 is an enlarged view of a part of FIG. It is sectional drawing which showed the detailed structure of one anchor head vicinity in FIG. 2A is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 2B is a cross-sectional view taken along the line CC in FIG. The Example which attaches the thinning material which is a rod-shaped member to the upper and lower sides of a rope is shown, (A) is a figure corresponding to FIG. 4 (A), (B) is a figure corresponding to FIG. 4 (B). In the embodiment in which thinned timber is attached to the top and bottom of the rope, the case where the depressions on the slope are different is shown. (A) corresponds to FIG. 5 (a), (b) corresponds to FIG. 5 (b). FIG. (A) is a diagram for explaining the situation in which the thinned wood prevents sediment runoff in the embodiment of FIG. 4 (in contrast to FIG. 4 etc., the slope is tilted), (b) is from (a) It is the figure shown in the wider range. It is a figure explaining the condition in which the thinning material prevents the sediment outflow in the Example of FIG. It is a figure explaining the condition in which the thinning material prevents the sediment outflow in the Example of FIG. The thinning material is arrange | positioned so that a rope may be sunk in a hollow, (a) is a figure corresponding to FIG. 4 (a), (b) is a figure corresponding to FIG. 4 (b). FIG. 6 is a view corresponding to FIG. 5B, showing still another embodiment of the means for holding the thinned material on the ground. The modification example of the pin for holding the thinned material on the ground is shown, and (a), (b), and (c) show different modification examples. FIG. 9 shows still another embodiment of the means for holding the thinned material on the ground, (A) is a diagram corresponding to FIG. 4 (B), and (B) is a diagram corresponding to FIG. 5 (B). FIG. 9 shows still another embodiment of the means for holding the thinned material on the ground, (A) is a diagram corresponding to FIG. 4 (B), and (B) is a diagram corresponding to FIG. 5 (B). FIG. 9 shows still another embodiment of the means for holding the thinned material on the ground, (A) is a diagram corresponding to FIG. 4 (B), and (B) is a diagram corresponding to FIG. 5 (B). It is a figure which shows the further another Example of the means to hold | maintain a thinned material on the ground, and uses the rope retaining ring of the part which connects a rope. An embodiment using a square steel pipe or a round steel pipe as a rod-shaped member is shown. (A), (B) are diagrams corresponding to FIG. 4 (B), (C), (D) are FIG. 5 (B). It is a corresponding figure. FIG. 6 shows still another embodiment of the present invention, and shows a case in which an anchor arrangement is made in a lattice shape and a rope forms a square mesh. The further another Example of this invention is shown, and the case where a net | network is laid beforehand is shown. It is a perspective view which shows the Example of the natural slope stabilization construction method which arrange | positions a folding screen-like member with a leg as an earth and sand outflow prevention member. (A) shows the embodiment of FIG. 20 in a cross-sectional view and corresponds to FIG. 4 (a), and (b) shows the same plan view. It is a perspective view which shows the Example of the natural slope stabilization construction method which arrange | positions a disk shaped member as an earth and sand outflow prevention member. (A) shows the embodiment of FIG. 22 in a sectional view and corresponds to FIG. 4 (a), and (b) is a plan view of the same.

Explanation of symbols

1 Anchor 2 Bearing member 3 Wire rope (rope)
3a Retaining ring 11 Thinned wood (bar-shaped member)
11a Groove 11A, 11B Steel pipe (bar-shaped member)
12 pin 12a head 12b turn-back part 13, 13 ', 13 "hollow 14 earth and sand 15 pin (penetration pin)
16 Clearance 17 Iron wire 18 Turnbuckle 20 Net 31 Screen-like member 31a with leg 31b Screen body 41 Disc-like member 41a Leg

Claims (6)

A natural slope stabilization method in which a large number of anchors are installed on the slope, and a supporting member is attached to the head of each anchor to fasten it to give support pressure to the ground, and each anchor head is connected with a rope. In
A natural slope stabilization method characterized by placing a sediment discharge prevention member along a rope and holding it on the ground at a portion having a depression in a portion along the rope of the ground.   2. The natural slope stabilization method according to claim 1, wherein the earth and sand outflow prevention member is a rod-shaped member.   The natural slope stabilization method according to claim 2, wherein the earth and sand bar-like member is a thinned material or a steel pipe.   The natural slope stabilization method according to claim 2 or 3, wherein the rod-like member is engaged with a rope so that the rope can be pushed down.   The natural slope stabilization method according to claim 2, wherein another bar-shaped member is stacked on the bar-shaped member disposed in the depression.   The pin having a horizontally projecting head as means for holding the rod-shaped member on the ground is inserted into the ground in such a manner that the upper surface of the rod-shaped member is pressed by the head. Natural slope stabilization method.

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