JP2000096570A - Natural slope stabilizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently obtain the bearing effect caused by bearing plates of anchors without bringing any effect of pile group to the anchors adjacent to each other and, at the same time, to promote efficiency of wire rope joint work between the anchors. SOLUTION: A plurality of anchors 11 are arranged on the natural slope at regular intervals, at the same time, bearing plates 12 are mounted to the anchors 11, they are clamped to provide bearing force against the ground, and joints among the anchors 11 are made with wire ropes 13. The arrangements of the anchors 11 are so arranged that a regular triangle making one side as a slope inclined direction is positioned to each of intersections of a regular triangle net formed in the shape of a mesh. Three anchors 11 forming one regular triangle mesh are connected with one of the wire ropes 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a natural slope stabilization method for stabilizing a natural slope.

[0002]

2. Description of the Related Art As a natural slope stabilization method for stabilizing a natural slope, as shown in FIG. 7, a plurality of anchors 1 are installed on a natural slope in a fixed arrangement.
There is known a method in which a supporting plate 2 is attached to a base plate and tightened to apply a supporting force to the ground, and the anchors 1 are connected to each other by a linear member such as a wire rope 3. FIG. 7 shows a conventional example, but in this kind of natural slope stabilization method, the arrangement of the anchors 1 is such that the anchors 1 are arranged linearly in the vertical and horizontal directions, that is, the four vertical and horizontal sides are aligned. It is general to form a grid-like array so as to form a square mesh having the same. The wire ropes 3 connecting the anchors 1 form a rectangular mesh with the wire ropes through the wire ropes in the vertical and horizontal directions in accordance with the grid-like arrangement of the anchors 1 and anchor the intersections of the vertical and horizontal wire ropes. (See Japanese Patent Application Laid-Open No. 10-88577).

In some cases, the arrangement of the anchors is such that a triangular mesh is formed. Even in such a case, at least one side of the triangle is a horizontal arrangement.
Therefore, there is a wire rope extending in the horizontal direction (see FIG. 2 of JP-A-56-142935).

[0004]

In the above-mentioned conventional method, the wire ropes 3 connecting the anchors 1 exhibit a retaining effect at the time of sliding on a slope, and the anchors 1
This has the effect of integrating them, and is effective for stabilizing slopes. In addition, on natural slopes, plants and stones cover the ground surface and there are undulations. In such a ground surface, the connection of the anchors 1 is more flexible than a rigid rod-shaped member. It is appropriate to do with.

[0005] However, in the above-mentioned conventional method, not all wire ropes exert a retaining force for slope sliding. That is, in FIG. 8, when one anchor 1 (indicated by A) attempts to deform due to the sliding force of the slope ground, the anchors 1 (A ′, B, C) around the anchor 1 (A ′, B, C)
Considering the detent force acting through the wire rope 3 from FIG. 8, as shown in FIG. 8, the actions of the wire ropes AB, AA ′ and AC are considered, but AB and A
Since the -C lateral wire rope does not exert a retaining force, only the AA 'wire rope exerts the retaining force. Therefore, the arrangement for obtaining the retaining force is inefficient. In addition, the load of the wire rope AA 'is large, and a wire rope having sufficiently high tensile strength is required. However, a wire rope having a high tensile strength has a high bending rigidity, which makes it difficult to perform construction along the undulation of a natural slope, and also reduces the workability.

By the way, when the pulling force acts on the anchor, the range of influence of the pulling force on the surrounding ground (the range of the pulling force influence) is a circular range centered on the anchor. Now, as shown in FIG. 9 (a), if the spacing between adjacent anchors 1 is narrow and the pulling force influence ranges of the respective anchors 1 overlap each other, a pile effect is obtained in the case of piles, and pulling resistance is reduced. However, as shown in FIG. 9 (b), when the distance between the anchors 1 is widened so that the influence ranges of the pulling force do not overlap, a range beyond the supporting pressure by the pressure supporting plate occurs (or the range beyond the widening range). No.), and a sufficient slope stabilizing effect may not be obtained.
Therefore, as shown in FIG. 9C, it is desirable to arrange the anchors 1 close to each other within a range in which the pulling force influence ranges do not overlap. FIG. 10 is a plan view showing the state of FIG. 9C, and the hatched portion is the anchor 11.
Is the range of influence of the pull-out force.

Further, since the work of connecting the anchors 1 is performed on a natural slope with vegetation and stones covering the ground surface and having undulations, the work is difficult even with a flexible wire rope 3. It is desired that this can be performed efficiently.

The present invention has been made in view of the above circumstances, and it is possible to efficiently obtain a bearing effect by a bearing plate of each anchor without causing a group pile effect to the arranged anchors, and furthermore, to provide a space between the anchors. An object of the present invention is to provide a natural slope stabilization method capable of easily performing a wire rope connection operation.

[0009]

According to the present invention, a plurality of anchors are arranged in a fixed array on a natural slope, and a support plate is attached to each anchor to fasten the anchors, thereby supporting the ground. In the natural slope stabilization method of connecting the anchors with a linear member, each intersection of the equilateral triangular meshes is arranged such that the arrangement of the anchors is one mesh shape with an equilateral triangle having one side forming the slope inclination direction. And the three anchors forming the one regular triangular mesh are connected by one linear body.

According to a second aspect of the present invention, in connecting the three anchors forming one regular triangular network with one linear body in the first aspect, any one of the adjacent regular triangular meshes sharing a side is connected. By selecting only one of the regular triangular meshes, the linear bodies connecting the anchors are prevented from overlapping.

A third aspect of the present invention is characterized in that the supporting plate according to the first or second aspect comprises a bottom plate and a cylindrical body fixed to an anchor insertion hole formed in the bottom plate.

According to a fourth aspect of the present invention, the supporting plate according to the first or second aspect is fixed on the bottom plate so as to reinforce the cylindrical body fixed to the bottom plate and the anchor insertion hole formed in the bottom plate. And a notch for connecting the linear body at a connection portion of the rib with the cylindrical body.

A fifth aspect of the present invention is characterized in that the bottom plate in the fourth aspect has a substantially equilateral triangular shape, and the rib is provided in a direction from the outer peripheral surface of the cylindrical body to the vertex of the equilateral triangle.

According to a sixth aspect of the present invention, in performing the natural slope stabilization method of the first or second aspect, three anchors forming an outermost regular triangular mesh of the construction area are linearly formed on one side of the regular triangle. When there is no body, the three anchors forming the regular triangular mesh are also connected by one linear body so that the linear bodies overlap on two sides of the regular triangle. And

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given with reference to the natural slope stabilization method of one embodiment shown in FIG. FIG. 1 is a plan view showing an arrangement of anchors and a linear body on a natural slope on which a natural slope stabilization method according to one embodiment is applied. FIG. 2 shows only three anchor portions forming one regular triangular mesh in FIG. FIG. In the natural slope stabilization method of the present invention, a plurality of anchors 11 are installed in a fixed arrangement on a natural slope, and a bearing plate 12 is attached to each anchor 11 to fasten them to give a bearing force to the ground, and This is a method of connecting the anchors 11 with a linear member such as a wire rope 13. In the present invention, the arrangement of the anchor 11 is
As shown in FIG. 2 showing details of one equilateral triangular mesh portion,
An arrangement is made such that each anchor 11 is located at each intersection of a regular triangular mesh in which a regular triangle whose one side forms a slope inclination direction (vertical direction in FIGS. 1 and 2) forms one mesh shape. The three anchors 11 forming a triangular mesh are connected by one wire rope 13.

The supporting plate 12 of the embodiment is made of a steel plate. As shown in FIGS. 3 and 4, the supporting plate 12 is fixed by welding to a bottom plate 15 and an anchor insertion hole 15a formed in the center of the bottom plate 15. It comprises a cylinder 16 and a rib 17 welded to the bottom plate 15 and the cylinder 16 to reinforce the cylinder 16. In the illustrated example, the bottom plate 15 has a substantially equilateral triangular shape with the top notched, and the rib 17 is provided in a direction from the outer peripheral surface of the cylindrical body 16 toward the top of the equilateral triangle. Further, a notch 17a for connecting a wire rope is provided at a connection portion of the rib 17 with the cylindrical body 16. In FIG. 2, reference numeral 14 denotes a connection fitting which connects both ends of one wire rope 13 wrapped around three anchors 11. The support plate in the present invention is not necessarily limited to a structure having a rib as in the embodiment. As long as the rigidity of the cylinder and the bottom plate is sufficiently high and the cylinder is firmly fixed to the bottom plate, a structure in which the cylinder is simply fixed to the bottom plate may be used.

Next, an example of a concrete construction procedure will be described. A plurality of anchors 11 are constructed in the arrangement shown in FIG. 1 on a natural slope in a construction area. That is, each anchor 11 forms one equilateral triangle with one side forming a slope inclination direction.
It is constructed in such an arrangement that it is located at each intersection of an equilateral triangular network with two mesh shapes. This anchor construction may be a method of driving the anchor 11 into the ground by the impact force of a driving machine, or a method of excavating an anchor hole, inserting the anchor 11, and then injecting grout. After that, the support plate 12 is inserted into the head of the anchor 11 to adjust the position, and then the support plate is applied to fix it to the ground.

Next, for example, three anchors 11 forming one regular triangular mesh shown in FIG. 1 are connected by one wire rope 13. In this case, as shown in FIGS. 2 and 3, the wire rope 13 is connected to the support plate 1 of each anchor 11.
2 through the notch 17a of the rib 17 in each cylinder 1
The wire rope 13 is turned around and tightened, and both ends of the wire rope 6 are connected by connecting metal fittings 14 to form an equilateral triangle of the wire rope 13. The tension of the wire rope 13 and the connection by the connection fitting are performed using a tool. As described above, the connection between the anchors 11 by the wire ropes 13 is performed as one unit with the equilateral triangle formed by the three anchors 11, but in this case, the connection is basically performed without overlapping the wire ropes 13. That is, when connecting the three anchors 11 forming one regular triangular mesh with one wire rope 13,
As for adjacent equilateral triangular meshes sharing a side, only one of the equilateral triangular meshes is selected. In the case of the vicinity of the left end in FIG. 1, if the anchors 11 are connected with respect to regular triangles such as,..., The wire rope 13 can be routed efficiently without overlapping. As a result, the anchors 11 are connected by the wire rope 13. However, for the three anchors 11 (for example, anchors that form a regular triangle in the vicinity of the left end in FIG. 1) forming the outermost regular triangle mesh of the construction area, three regular triangles are also included in this regular triangle. Are connected by one wire rope 13. Therefore, in the outermost equilateral triangle, the wire ropes 13 overlap on two sides. Thereby, an effective retaining effect can be obtained also for the outermost anchor 11.

On the natural slope constructed as described above, each of the wire ropes 13 connecting the anchors 11 bears the retaining force on the anchors 11. That is, in FIG. 5, one anchor 11 (this is
When the wire ropes (AB, AC, and AD) 13 connected to the anchor 11 from three directions on the upper slope are deformed by the sliding force of the slope ground, Since the thighs have an angle, all exert a retaining force. Therefore, the anchor arrangement for obtaining the retaining force of the wire rope 13 is extremely efficient. In addition, since the load of one wire rope (AC) does not become particularly large, it is not necessary to make the wire rope have a specially high tensile strength. It can be easily performed even along the undulation of the slope.

Further, since the positional relationship between the adjacent anchors 11 forms an equilateral triangle, as shown in FIG.
When the influence range (hatched portion in FIG. 6) of the pull-out force with respect to 1 is approached without overlapping, the range in which the support pressure of the support plate of the adjacent anchor 11 does not occur does not occur. Can be smaller. It is clear that the range in which the supporting plate does not reach the supporting pressure can be reduced as compared with the case of the conventional lattice arrangement (FIG. 10).

In the present invention, the structure of the supporting plate is not particularly limited. For example, the bottom plate may have a square shape or another shape. In addition, it is not limited to steel plates. In short, what is necessary is just to be able to transmit the tension acting on the anchor to the ground as supporting pressure. Further, the engagement of the wire rope with the anchor is not limited to the method of rotating the tubular body 16, but may be any method such as a method of directly passing through a hole formed in the rib or a method of directly connecting to the anchor. The wire rope is not limited to a wire rope, and may be a flexible linear body such as a resin rope.

In the natural slope stabilization method of the present invention,
One side of the equilateral triangle formed by the three anchors is in the slope inclination direction, that is, the vertical arrangement of the anchors is the slope inclination direction. However, in actual construction on a natural slope, the vertical arrangement of all anchors is strictly slope inclination. It does not mean that it is a direction. In other words, it is normal for natural slopes to have undulations. Even if one reference vertical arrangement is used as the slope inclination direction, the vertical arrangement of anchors distributed in the horizontal direction does not always have a strict slope inclination direction. What is necessary is just a thing which intends a slope inclination direction as a construction policy, ie, a construction idea.

[0023]

According to the present invention, the arrangement of the anchors is such that the equilateral triangles each having a slope in the inclined direction are located at the respective intersections of the equilateral triangular network having one mesh shape. All the linear bodies connecting between them can exert a retaining force, and the retaining effect at the time of sliding on a slope by the linear bodies can be efficiently obtained. In addition, avoiding that the influence range when the pulling force acts on the adjacent anchor overlaps with each other to cause the group pile effect, and that the range where the bearing pressure of the adjacent anchor does not reach the supporting plate is not generated. It is possible to efficiently satisfy both of reducing the range that cannot be reached.

Further, since the three anchors forming one regular triangular mesh are connected by one linear body, the work of connecting the linear bodies between the anchors is easy, and the plants and trees cover the ground surface, and Even when a natural slope with a large area is to be constructed over a wide range, it is possible to efficiently perform the linear body connection work.

According to the second aspect, when connecting the arranged anchors with a linear body, the linear body can be connected to a necessary place without waste and reliably.
It is possible to easily realize the reliable linear connection without waste in the actual site.

According to the fourth aspect, the tension of the linear body can be effectively transmitted to the anchor, and the operation of connecting the linear body is easy. Further, according to the fourth aspect, the rib does not hinder the drawing of the linear body, and the workability of connecting the linear body is good.

According to the sixth aspect, the effect of connecting the linear bodies is obtained even at the outermost portion of the construction area, and is effective for stabilizing the natural slope.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a natural slope stabilization method of the present invention, showing an anchor arrangement and a linear body on a natural slope.

FIG. 2 is a detailed enlarged view showing only three anchor portions forming one regular triangular mesh in FIG. 1;

FIG. 3 is a view as viewed in the direction of arrow A in FIG. 2;

FIG. 4 is a plan view showing only a support plate in FIG. 3;

FIG. 5 is an explanatory diagram of a retaining force acting on a wire rope in the natural slope stabilization method of the embodiment.

FIG. 6 is an explanatory diagram of a case where adjacent anchors are brought close to each other within a range where the pull-out force influence ranges do not overlap in the natural slope stabilization method of the embodiment.

FIG. 7 is a plan view showing a conventional natural slope stabilization method and showing an anchor arrangement and a linear object connection mode on a natural slope.

FIG. 8 is an explanatory diagram of a retaining force acting on a wire rope in the natural slope stabilization method of FIG. 7;

FIG. 9 is a diagram illustrating an influence range when a pull-out force acts on an anchor in the natural slope stabilization method.

FIG. 10 is an explanatory diagram of a case in which adjacent anchors are brought close to each other within a range where the pull-out force influence ranges do not overlap with each other in the natural slope stabilization method of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Anchor 12 Support plate 13 Wire rope 15 Bottom plate 15a Anchor insertion hole 16 Cylindrical body 17 Rib 17a Notch

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takato Inoue 1-4-2-705 Shinmachi, Hoya-shi, Tokyo F-term (reference) 2D041 GA01 GB01 GC12 GD02 2D044 DB02

Claims (6)

[Claims] 1. A plurality of anchors are arranged on a natural slope in a fixed arrangement, and a pressure plate is attached to each anchor to tighten it to give a pressure to the ground, and a linear member is provided between the anchors. In the natural slope stabilization method to be connected, the array of the anchors is arranged so as to be located at each intersection of an equilateral triangular mesh in which an equilateral triangle having one side forming the slope inclining direction is formed into one mesh shape. A natural slope stabilization method comprising connecting three anchors forming one regular triangular mesh with one linear body. 2. When connecting the three anchors forming the one regular triangular mesh with one linear body, only one of the regular triangular meshes adjacent to the triangular meshes sharing a side is connected. 2. The natural slope stabilization method according to claim 1, wherein the selection is such that the linear bodies connecting the anchors do not overlap. 3. The natural slope stabilization method according to claim 1, wherein the support plate comprises a bottom plate and a cylindrical body fixed in accordance with an anchor insertion hole formed in the bottom plate. 4. The supporting plate is composed of a bottom plate, a cylinder fixed to an anchor insertion hole formed in the bottom plate, and a rib fixed on the bottom plate so as to reinforce the cylinder. 3. The natural slope stabilization method according to claim 1, wherein a notch for connecting the linear body is provided at a connection portion of the rib with the cylindrical body. 5. The natural slope stabilization method according to claim 4, wherein the bottom plate has a substantially equilateral triangular shape, and the rib is provided in a direction from an outer peripheral surface of the cylindrical body to a vertex of the equilateral triangle. . 6. The three anchors forming the outermost equilateral triangular mesh of the construction area, when there is no linear body on one side of the equilateral triangle, the distance between the three anchors forming the equilateral triangular mesh is reduced. The natural slope stabilization method according to claim 1 or 2, wherein the linear members are also connected by one linear member so that the linear members overlap on two sides of the equilateral triangle.