JP2008025237A - Natural slope stabilizing construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a natural slope stabilizing construction method matching to a natural slope, while effectively preventing the outflow of sediment. <P>SOLUTION: The natural slope stabilizing construction method connects mutual anchors 1 by a wire rope 3 by fastening a bearing pressure member 2 by installing the bearing pressure member 2 in a head part of the respective anchors 1 installed on the natural slope. A thinning material 11 for preventing the outflow of the sediment is arranged along the wire rope 3, and is held on the ground surface. The thinning material 11 is easily available in a proper outer diameter, the length and weight for the sediment outflow preventive action, and matches the natural slope in a scenery without a sense of incongruity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a natural slope stabilization method for stabilizing a slope by using a large number of anchors, bearing members attached to the anchor head, and a rope connecting the anchor head, and in particular, effectively preventing the outflow of surface soil. It relates to a natural slope stabilization method that can be planned.

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.

In the above-mentioned Patent Document 1, various structures for preventing sediment discharge are proposed as described above, but it is desired to further enhance the effect of preventing sediment discharge and match the natural slope.
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 for that purpose. An object of the present invention is to provide a natural slope stabilization method in which a sediment discharge prevention member matches a natural slope.

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,
A thinning material is disposed along the rope to prevent sediment discharge and is held on the ground.

  According to a second aspect of the present invention, in the natural slope stabilization method of the first aspect, the thinned material is disposed substantially above the rope.

  According to a third aspect of the present invention, in the natural slope stabilization method of the first aspect, the thinned material is arranged on the upper side and the lower side of the rope.

  Claim 4 is a natural slope stabilization method according to claims 1 to 3, wherein as a means for holding the thinned material on the ground, a pin having a horizontally projecting head is pressed against the upper surface of the thinned material by the head. It is characterized by being inserted into the ground.

  According to a fifth aspect of the present invention, in the natural slope stabilization method according to the fourth aspect, the pin is inserted into the ground such that a rope is positioned between the pin and the thinned material.

  According to a sixth aspect of the present invention, in the natural slope stabilization method according to any one of the first to third aspects, a pin penetrating the thinned material is inserted into the ground as means for holding the thinned material on the ground.

  Claim 7 is a natural slope stabilization method according to claims 1 to 4 or 6, wherein as a means for holding the thinned material on the ground, a groove in the length direction of the thinned material is formed on the lower surface side of the thinned material. It is characterized by accommodating a rope.

  Claim 8 is the natural slope stabilization method according to claims 1 to 7, wherein the anchors are arranged so that three adjacent anchors form a triangle, and one anchor is formed for every three anchors forming a triangle. It is characterized by connecting the anchors by turning the rope.

According to the invention of claim 9, a large number of anchors are installed on the slope, a supporting member is attached to the head of each anchor, and this is fastened to give a supporting pressure to the ground, and a rope is provided between the anchor heads. In the natural slope stabilization method connected with
Place thinning material along the rope to prevent sediment runoff and hold it on the ground. When sediment flows down due to rainfall or earthquake, it will be pushed by the thinning material that stops sediment flow and tension will increase. It is characterized by being engaged with thinned wood to make it possible.

When constructing the natural slope stabilization method of the present invention, the anchor interval is often set to about 2 m, for example. In addition, when a member for preventing sediment outflow is provided along the rope, it is effective for preventing sediment outflow to have a certain height.
On the other hand, thinned timber has a length of a little less than 2 m and a certain thickness such as an outer diameter of about 100 mm. In addition, there are many cases where thinned wood can be obtained locally, and if it can be procured locally, it does not require transportation costs and can be constructed at low cost. Moreover, since the thinned wood can be arbitrarily cut at the site and the length can be adjusted, it can easily cope with various site conditions and has good workability.
In addition, since the surface layer of the natural slope is soft, thinned wood with a certain amount of weight usually fits well on the ground when placed on a natural slope with some unevenness, and is also suitable as a sediment runoff prevention member along this rope in this respect as well .
In addition, it is a common sight that a tree trunk lies on a natural slope, and compared with a metal earth and sand runoff prevention member, thinned wood matches the natural slope without a sense of incongruity.

  As in the second aspect, as a means for arranging the thinned material along the rope, attaching the thinned material to the upper side of the rope is a natural arrangement that is not unreasonable because the rope is generally lying on the ground.

  When thinning material is attached to both the upper side and the lower side of the rope as in claim 3, there is a case where there is a depression of a certain depth in the middle part of the adjacent anchor, and the lower thinning material is used as the depression. When installing on a slope with such a depression, it is possible to effectively prevent sediment outflow from the depression.

  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 thinned material is pressed by the head, the thinned material can be easily held on the ground.

  According to the method of inserting the pin into the ground so that the rope is positioned between the pin and the thinned material as in claim 5, the thinned material is also restrained by the rope in the presence of the pin. It is suitable as a simple means to hold the material on the ground along the rope.

  According to the method of inserting the pin which penetrates the thinned material into the ground as in the sixth aspect, the thinned material can be easily and reliably held on the ground.

  According to the method of forming a groove in the length direction of the thinned material on the lower surface side of the thinned material as in claim 7, and the method of accommodating the rope in this groove, the thinned material is surely engaged with the rope. It is suitable as a means for securely holding the thinned wood on the ground along the rope.

  In claim 8, the anchor arrangement is a triangle arrangement, and the rope is a pattern that forms each side of the triangle. In this triangle pattern, a quadrilateral pattern in which the rope is stretched vertically and horizontally between the inclined slope direction and the horizontal direction is used. As compared with, it is possible to increase the portion of the rope in the direction (the direction having an angle with respect to the inclined slope direction) in which it is easy to prevent sediment outflow. Therefore, it is possible to enhance the sediment prevention effect of the thinned wood disposed along the rope as the entire slope.

  As in claim 9, when the rope is engaged with the thinning material so as to allow the tension to be increased by being pushed by the thinning material that stops the flow of the earth and sand when the earth and sand flows down due to rainfall or earthquake It can effectively prevent sediment flow during rainfall, earthquakes. In addition, it is not limited to rain and earthquake, but it supplements the rope tension that tends to decrease over time, which is preferable from the viewpoint of the slope stabilization action of the rope.

  Hereinafter, an embodiment 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 thinning material 11 is disposed along the wire rope 3 to prevent sediment discharge and is held on the ground. 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. At that time, the thinned material 11 is arranged on the upper side of the slope of the wire rope 3 (on the right side in FIG. 4B) so that the wire rope 3 is positioned in the gap between the pin 12, the thinned material 11 and the ground. ing. As a result, the thinned material 11 is also restrained by the wire rope 3 due to the presence of the pins 12. In this case, the thinned material 11 is not directly above the wire rope 3 but is generally on the upper side. In the illustrated example, the thinned material 11 is held by pins 12 at two locations on both sides in the length direction.

As shown in FIG. 7, the thinning material 11 arranged and held along the wire rope 3 as described above stops the earth and sand 14 that is about to flow downward from the upper side of the slope, and on the upper side of the slope of the thinning material 11. Deposit. Since the wire rope 3 may be slightly lifted from the ground without being crushed on the ground, if the thinned material 11 is arranged on the upper side of the slope of the wire rope 3 as shown, the slope received by the thinned material 11 from the earth and sand The wire rope 3 receives the downward force in the tilt direction together with the pin 12, which is effective for integrating the two. In that case, the downward slanting direction force that the thinning material 11 receives from the earth and sand acts to increase the tension of the wire rope 3 (the tension of the wire rope 3 is increased by being pushed by the thinning material that stops the flow of the earth and sand). The tension of the wire rope 3 that tends to decrease with the passage of time is compensated, which is preferable in terms of the slope stabilization action of the wire rope 3.
When the wire rope 3 is engaged with the thinning material 11, when the earth and sand flow down due to rainfall or earthquake, the wire rope 3 is integrated to such an extent that it can be pushed by the thinning material to stop the sediment flow and increase the tension. In this state, when the rope is engaged with the thinning material, it is possible to effectively prevent sediment flow during rainfall and earthquake. As a means for integrating the rope and the thinned material in such a manner, an engagement structure in which the rope 3 is accommodated in the groove 11a of the thinned material 11 as shown in FIG. 10 to be described later, or an iron wire 17 as shown in FIG. An engagement structure for binding 3 and 11 and various other methods are conceivable.

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 enters the construction slope for maintenance of the slope or the like, it is easy to get caught in the inconspicuous wire rope 3, but when the thinning material 11 is arranged along the wire rope 3, the thinning material 11 is Because it stands out, you can prevent it from getting caught without paying special attention. This can also be said at the time of work for constructing the method of the present invention. Moreover, it is easy to catch a leg especially when the wire rope 3 is floating from the ground, but since the thinning material 11 attaches the wire rope 3 to the ground, only the wire rope 3 extends on both sides of the thinning material 11. It is effective in preventing the hook of the foot.

  Since the thinning material 11 is disposed for the purpose of preventing sediment outflow, the necessity of arranging the thinning material 11 along the vertical portion of the triangular wire rope 3 (side in the inclined slope direction) is an oblique portion. Compared to the case of arranging along the (side having an angle with respect to the slope inclination direction), there are few. Therefore, the thinned material 11 is not limited to the case where the thinned material 11 is arranged in all the vertical and diagonal portions of the wire rope 3 that forms a triangle as in the embodiment, but the thinned material is used for a part or all of the vertical portion of the wire rope 3. The arrangement of 11 may be omitted. In addition, it is not necessarily limited to the case where the thinning material 11 is arrange | positioned all over the diagonal part of the wire rope 3 either.

Since this embodiment is a pattern in which the wire rope 3 forms a triangular mesh, as will be described below, the thinned wood compared to the case where the wire rope 3 is arranged in a vertical and horizontal lattice pattern to form a square mesh. The merit of arranging 11 along the wire rope 3 is great.
As described above, since the thinning material 11 is disposed for the purpose of preventing sediment outflow, it is not necessary to dispose the thinning material 11 in the inclined direction of the wire rope 3. Therefore, when the wire rope 3 is the triangular mesh pattern of the illustrated example, the thinning material 11 that greatly contributes to prevention of sediment discharge is the thinning material 11 arranged on two of the three sides of the triangle, and the whole three minutes 2.
On the other hand, when the wire rope has a rectangular mesh pattern with vertical and horizontal lattices, the thinning material that greatly contributes to prevention of sediment discharge is thinning material arranged on two of the four sides of the square, One half.
Therefore, in the case of the embodiment in which the wire rope 3 is a triangular mesh pattern, the proportion of the portion contributing to the prevention of sediment discharge (the prevention of sediment discharge relative to the entire mesh side) is compared with the case where the wire rope is a square mesh pattern. The ratio of sides that contribute to The fact that the ratio of the part contributing to prevention of sediment runoff is not directly related to the problem of using or not using thinned wood, but considering that the other effects of thinning wood 11 are significant. In this case, when the wire rope 3 has a triangular mesh pattern, the effect of the present invention is greatly achieved.

FIG. 5 shows an embodiment where there is a recess 13 at the wire rope position on the slope. In this case, the thinned material 11 is disposed not only on the upper side of the wire rope 3 but also on the lower side, and the upper and lower thinned materials 11 are integrally held on the ground.
In the example of illustration, like the said Example, the pin 12 for thinning material holding | maintenance with the downward U-shaped head 12a is inserted in the ground, the upper surface of the thinning material 11 is pressed by the head 12a, and the thinning material 11 is used. Holding on the ground. Note that the folded portion 12b of the downward U-shaped head portion 12a of the pin 12 may be elongated so as to reach the lower thinning material 11 as indicated by a two-dot chain line. 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, the lower thinning material 11 occupies the space below the wire rope 3. That is, as shown in FIG. 8, the thinned material 11 partially fills the recess 13. Therefore, it is possible to avoid the loss of the sediment outflow prevention function due to the presence of the depression 13. Initially, the lower thinning material 11 prevents the sediment from flowing out, and after the depression 13 is filled, the upper thinning material 11 prevents the sediment from flowing out, and the upper and lower thinning materials 11 deposit the sediment 14. .
In FIG. 8, the depression 13 is illustrated as a local depression 13 that is short in the slope inclination direction, but the same action is naturally performed even in the case of a groove-like depression that extends long in the slope inclination direction.

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 (a) shows a situation where the upper and lower thinning materials 11 deposit earth and sand 14 in such a case.
In addition, since thinned wood can be easily cut at the site, cutting the lower thinned wood and shortening it, as shown in FIG. It is also possible to install so that the gap 16 between the bottom surface is reduced or eliminated.

In the above-described embodiment, the wire rope 3 is arranged on the thinned material 11 on the outer peripheral surface. However, as shown in FIGS. 10 (a) and 10 (b), the thinned material 11 is formed with a groove 11a in the length direction of the thinned material. And you may accommodate the wire rope 3 in this groove | channel 11a.
Thereby, since it will be in the state engaged with the wire rope 3 reliably, it is suitable as a means to hold | maintain the thinned material 11 on the ground along the wire rope 3 reliably.
In addition, especially when piled up the thinning material 11 up and down like FIG.10 (b), it is effective in order to integrate the wire rope 3 with the thinning material 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. 11A 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. 11 (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. 11 (b), the head 12 a of the pin 12 may be formed in an arc shape along the outer peripheral surface of the thinned material 11 with a substantially circular cross section. 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. 11C, 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 thinned material 11 and the thinned 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 materials 11 are stacked up and down 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.

  In the embodiment shown in FIG. 13, the wire rope 3 is accommodated in the groove 11 a provided on the lower surface of the thinned material 11, and the through pin 15 penetrating the thinned material 11 is inserted into the ground to hold the thinned material 11 on the ground. To do. That is, the idea of both the embodiment of FIG. 10 and the embodiment of FIG. 12 is adopted. 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.

  As shown in FIG. 14, a simple method of binding the thinned material 11 to the wire rope 3 by binding the thinned material 11 and the wire rope 3 with an iron wire 17 or the like may be employed. 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 each of the above-described embodiments, only one thinning material is arranged in the horizontal direction, but as shown in FIG. 15, two thinning materials 11 are arranged side by side so as to sandwich the wire rope 3. You can also. In this case, as shown in the drawing, T-shaped pins 22 having arm portions 22a projecting on both sides are inserted into the ground, and the thinned material 11 is pressed by the arm portions 22a on both sides of the pins 22, so that the ground together with the wire rope 3 Can be held in.

  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.

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. The present invention is suitable for such a case as described above, but as shown in FIG. When the wire ropes 23 connecting the anchors 1 are formed in a lattice shape with the wire ropes 23a in the vertical direction (inclined slope direction) and the wire ropes 23b in the horizontal direction (horizontal direction) perpendicular to the wire ropes 23a. It can also be applied to. The illustrated bearing member 2 is circular.
In this case, the thinning material 11 is not limited to the case where the thinning material 11 is arranged along all the vertical and horizontal portions of the wire rope 23 as shown in the drawing, and the thinning material 11 may be omitted for some or all of the vertical direction. Also in the lateral direction, the present invention is not necessarily limited to the case where the thinned material 11 is arranged in all.

FIG. 18 shows an embodiment in which a net 20 such as a wire mesh is laid in advance on the 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 of FIG. 18, the wire rope 3 may be omitted.

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 thinned material on 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. It is a figure explaining the condition in which the thinning material prevents the sediment outflow in the Example of FIG. 4 (in addition, unlike FIG. 4 etc., it is inclined and is illustrated). It is a figure explaining the condition in which the thinning material prevents the sediment outflow in the Example of FIG. (A) is a figure explaining the condition where the thinning material prevents the sediment outflow in the embodiment of FIG. 6, and (b) is a diagram showing a case where the lower thinning material in the embodiment of FIG. 6 is shortened. 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). 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 Example in the case of arrange | positioning two thinnings side by side. 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. 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.

Explanation of symbols

1 Anchor 2 Bearing member 3 Wire rope (rope)
3a Retaining ring 11 Thinned material 11a Groove 12 Pin 12a Head 12b Turn-up part 13 Indentation 14 Earth and sand 15 Pin (penetration pin)
16 Gap 17 Iron wire 18 Turnbuckle 20 Net 22 Pin 22a Arm

Claims (9)

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 thinned wood along the rope to prevent sediment runoff and holding it on the ground.   The natural slope stabilization method according to claim 1, wherein the thinned wood is disposed substantially above the rope.   2. The natural slope stabilization method according to claim 1, wherein the thinned wood is arranged on the upper side and the lower side of the rope.   The natural pin according to claim 1, wherein as a means for holding the thinned wood on the ground, a pin having a horizontally projecting head is inserted into the ground in such a manner that the top of the thinned wood is pressed by the head. Slope stabilization method.   The natural slope stabilization method according to claim 4, wherein the pin is inserted into the ground such that a rope is positioned between the pin and the thinned material.   4. The natural slope stabilization method according to claim 1, wherein a pin penetrating the thinned material is inserted into the ground as means for holding the thinned material on the ground.   The natural slope according to claim 1 or 2, wherein a groove in the length direction of the thinned material is formed on the lower surface side of the thinned material as a means for holding the thinned material on the ground, and a rope is accommodated in the groove. Stabilization method.   The anchors are arranged such that three adjacent anchors form a triangle, and one rope is rotated for each of the three anchors forming a triangle to connect the anchors together. The natural slope stabilization method of 1-7. A natural slope stabilizer that installs a large number of anchors on the slope, attaches a bearing member to the head of each anchor, tightens it to provide bearing pressure to the ground, and connects the anchor heads with a rope. In law
Place thinning material along the rope to prevent sediment runoff and hold it on the ground. When sediment flows down due to rainfall or earthquake, it will be pushed by the thinning material that stops sediment flow and tension will increase. Natural slope stabilization method characterized by engaging with thinned wood to enable it.

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