JP2001355238A - Slope stabilizing method and slope stabilizing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of a slope stabilizing execution method utilizing the ground bearing power by bearing plates fitted to anchor head sections and the anchor straining effect by ropes connecting anchor head sections together. SOLUTION: A plurality of main ropes 2 are arranged at intervals in the slope lateral direction from the upper section toward the lower section of a slope, then anchors 3 are placed at proper intervals along the main ropes 2. The fitting work of the bearing plates 4 to the head sections of the anchors 3, the connecting work of the main ropes 2 to the head sections of the anchors 3 or the bearing plates 4, the forcibly sinking work of the bearing plates 4 to apply the ground bearing power to the anchors 3, and the connecting work of the head sections of the anchors 3 arranged in the diagonal direction, for example, with auxiliary ropes 13 are conducted. Since the anchors 3 are merely installed along the main ropes 2 in the stage that the main ropes 2 are vertically arranged on the slope, high precision is not required on the installation positions of the anchors 3, the positioning of the anchors becomes very easy, and work efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention employs a slope stabilization method utilizing a ground support force of a support plate attached to an anchor head, an anchor retaining effect of a rope connecting the anchor heads, and the like, and this method. The stabilized slope structure.

[0002]

2. Description of the Related Art In the above-mentioned slope stabilization method, a plurality of anchors are distributed and installed on a slope, a support plate is attached to each anchor head, and the support plate is attached to the anchor so that a tensile force due to a reaction force acts on the anchor. It is a method of stabilizing slopes without cutting down trees, and is attracting attention as a natural slope stabilization method. In this slope stabilization method, the rope connecting the anchors has an anchor retaining effect of exerting a retaining force on the anchor with respect to the movement of the earth mass, thereby contributing to the stabilization of the slope. In this type of conventional construction method, as a connection mode of a rope that connects between heads of distributed and installed anchors, for example, three adjacent or adjacent anchors are connected in a triangular shape, or adjacent or adjacent four anchors are connected. In general, a plurality of adjacent or adjacent anchors are connected in a ring shape, for example, a plurality of anchors are connected in a square shape (see Japanese Patent Application No. 11-223320).

[0003] There is also a method of connecting ropes in a manner of connecting ropes vertically and horizontally and arranging them in a grid pattern (see JP-A-10-88577).
In this conventional construction method, as a procedure, first, a vertical rope and a horizontal rope are passed vertically and horizontally and arranged in a lattice, and then an anchor is installed (placed or drilled and inserted). And forcibly settled, and then attach the vertical and horizontal ropes to the support plate.

[0004]

The conventional method of connecting a plurality of adjacent anchors in a ring shape with a rope in the form of a rope has a problem that when the earth mass moves, the rope gradually spreads over the entire slope due to the anchor retaining effect of the rope. However, the workability of the work of connecting a plurality of adjacent anchors in a loop with a rope is not always efficient.

Further, in a construction method in which a vertical rope and a horizontal rope are previously arranged in a grid by passing them vertically and horizontally (Japanese Patent Laid-Open No. 10-88577), the installation position of the anchor is determined in advance by a grid-like arrangement. It must be accurate for ropes, and it is not always easy to construct on slopes with trees and other irregularities such as natural slopes.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and has as its object to provide a slope stabilization method with good workability. The purpose is to improve the quality.

[0007]

According to the slope stabilization method of the present invention for solving the above-mentioned problems, a plurality of main ropes are arranged at an interval in a lateral direction of the slope from an upper part to a lower part of the slope,
Then, after installing anchors at appropriate intervals along the main rope, and then attaching a supporting plate to the head of the anchor and connecting the main rope to the anchor head or supporting plate,
The support plate is forcibly settled so that the ground supporting force acts on the anchor, and then the heads of the anchors arranged diagonally or laterally are connected by an auxiliary rope.

According to a second aspect of the present invention, the arrangement of the anchors in the slope stabilization method according to the first aspect is a staggered arrangement in which anchors adjacent in the lateral direction of the slope are vertically displaced.
The heads of the diagonally adjacent anchors are connected by an auxiliary rope.

According to a third aspect of the present invention, in the slope stabilizing method according to the first aspect, before attaching the bearing plate to the installed anchor, a short tubular body is placed on the outer periphery immediately below the ground surface of the anchor, and then the tubular body is mounted. And connecting the main rope directly or via a connecting member.

According to a fourth aspect of the present invention, in the slope stabilization method according to the third aspect, the connecting member grips an attachment portion to the outer periphery of the anchor and a main rope extending linearly provided integrally with the attachment portion. And a unit.

According to a fifth aspect of the present invention, in the slope stabilizing structure according to the first aspect, a net is arranged on each mesh portion formed by the auxiliary rope, and an edge of the net is attached to the auxiliary rope. I do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a slope stabilization method according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic plan view of a main part of a slope on which a slope stabilization method according to one embodiment of the present invention is applied, and FIG. 2 is an enlarged view A of FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 2. FIG. 4 is a cross-sectional view taken along line CC of FIG. 2, and FIG. 5 is an enlarged view for explaining a mode in which the heads of two anchors adjacent to each other obliquely in FIG.

First, a plurality of main ropes 2 are arranged at an interval in the lateral direction of the slope (the left-right direction in FIG. 1) from the upper part (the upper part in FIG. 1) to the lower part of the slope 1. Next, anchors 3 are installed at appropriate intervals in the vertical direction along the main rope 2. The anchor 3 of the embodiment is a so-called lock bolt formed with a screw. Next, after covering a short tubular body 5 having a flange 5a at the upper end on the outer periphery of the anchor 3 directly below the ground surface, the supporting plate 4 is attached to the head of the anchor 3. A connecting member 7 for connecting the main rope 2 is attached to the tubular body 5. The connecting member 7 includes an attachment portion 8 to the tubular body 5 and a grip portion 9 provided integrally with the attachment portion 8 and gripping the main rope 2 extending linearly. The mounting portion 8 is fixed to the cylindrical body 5 by holding the outer periphery of the cylindrical body 5 with a pair of bands 8a and tightening a bolt 8b. The grip portion 9 grips the main rope 2 passed through the cylindrical portion by, for example, a set bolt 9a. Although the detailed structure of the grip portion 9 is omitted, it is preferable that the main rope 2 be inserted into the inside from the side as a hollow split structure having a cover that can be opened and closed. Means for gripping the main rope 2 can employ various other structures.

Next, the support plate 4 is put on the head of the anchor 3 and put on the flange 5a of the tubular body 5. Next, the nut 12 is screwed into the screw portion of the anchor 3 with the washer 11 interposed therebetween, and tightened. As a result, the support plate 4 generates a tensile force as a reaction force on the anchor 3 (ie,
It sinks while applying ground support). At this time, the support plate 4 also causes the main rope 2 attached to the tubular body 5 to sink, so that not only a mere horizontal tension but also a vertical tension acts on the main rope 2 so that the main rope 2 The ground holding effect of pressing the ground and holding the ground is increased, contributing to stabilization of slopes. FIG. 2 shows a state in which the support plate 4 has sunk.

For each anchor 3 on the entire slope, a support plate 4
After the support plate 4 is forcibly settled, respectively, as shown in FIG.
With regard to the above, the heads of two anchors 3 that are adjacent to each other in an oblique direction are connected by an auxiliary rope 13. In this embodiment, the auxiliary ropes 13 each having a ring formed at both ends are connected by one auxiliary rope 13 between two adjacent anchors 3. The auxiliary rope 13 is used for the anchor 3 of the main rope 2.
In the same manner as the anchoring effect on the anchor 3, the anchor 3 has an anchoring effect,
Since they are connected to each other, the force is transmitted in a diagonal direction and acts to disperse the force that prevents the movement of the earth mass, thereby contributing to stabilization of the slope. The operation of forcibly lowering the support plate 4 in one anchor 3 and connecting the supporting plate 4 to the adjacent anchor 3 with the auxiliary rope 13 may be sequentially repeated for the anchor 3 on the entire slope, or may be performed for the anchor 3 on the entire slope. After connecting the ropes 13, a procedure may be adopted in which the support plates 4 of the respective anchors 3 are forcibly settled.

Next, a cap 14 is attached to the head of the anchor 3.
And a bolt 15 is formed on the upper end surface of the anchor 3 from above the hole 14a formed on the upper surface of the cap 14.
To fix the cap 14 on the support plate 4.

As described above, only a plurality of main ropes 2 are vertically arranged in advance, and the anchors 3 are installed at predetermined intervals along the main ropes 2. Therefore, the positioning of the anchor 3 becomes extremely easy, and the work efficiency is improved.

FIG. 6 shows a fifth embodiment. In this embodiment, two adjacent auxiliary ropes 13 are provided.
Both edges of a rhombus-shaped net 22 are attached between them. The net 22 has a ground holding effect of holding down the ground surface after construction, and contributes to stabilization of slopes.

FIG. 7 shows still another embodiment of the present invention, and FIG. 8 shows its operation in an enlarged view of a main part. In this embodiment, a stake 24 is installed further above a range in which a slope may collapse, and a cushioning device 25 such as a spring is provided between the stake 24 and the uppermost anchor 3 of the slope 1. It is connected by a vertical rope 26 interposed. The vertical rope 26 connected to the pile 24 has a retaining effect on the uppermost anchor 3 and contributes to stabilization of the slope.
As shown in FIG. 17, the shock absorbing device 25 includes a vertical rope 2
6, a coil spring (elastic member) 18, stopper pins 19 attached to both ends of the coil spring 18, and each stopper pin 19
9 is a structure including an extension limiting plate 20 having a restriction groove 20a for restricting a moving range of the extension 9. When tension is applied to the vertical rope 26, first, the coil spring 18 is extended, and after both stopper pins 19 respectively hit the ends of the restriction grooves 20a,
Full tension acts on the vertical rope 26.

In the case where the movement amount of the clod is small, the anchor 3,
The support plate 4 and the main rope 2 integrally resist, and at this time, the force acting on the main rope 2 gradually decreases toward the upper part of the slope due to the strength characteristics of the rope. Therefore, when the movement of the clod is small, the load has not yet been applied to the shock absorber 25 and the pile 24 (there is sufficient resistance in the range where the anchor 3 is installed). However, when the movement of the clod is large, or when the movement of the clod occurs at the upper part of the area where the anchor 3 is installed and an excessive force acts on the main rope 2 at a stage where the displacement of the anchor 3 is small, the cushioning device 25 is used. Otherwise, the main rope 2 may be broken, and the sediment that has been stopped may move at a stretch. However, if the buffer device 25 is interposed as described above, even if the movement of the earth mass increases, the load on the main rope 2 can be reduced by the buffer device 25, eliminating the possibility of the main rope 2 breaking, It is possible to prevent the danger of the slope collapse starting at once.

The pile installed on the slope is more effective as the diameter is larger. However, since it is difficult to construct the pile while leaving trees, as shown in FIG. 10, a pile 24 'having blades 24'a is used.
May be used to ensure the passive resistance.

In the above embodiment, the anchors 3 are arranged in a zigzag pattern, and the diagonal auxiliary ropes 13 connect the diagonally adjacent anchors 3 with each other. The present invention can also be applied to a case of a grid-like arrangement arranged in the horizontal direction. In this case, the auxiliary rope 13 connects the anchors 3 arranged in the horizontal direction.
Further, in the embodiment, one auxiliary rope 13 only connects the two anchors 3. However, by using a longer auxiliary rope, three or more anchors 3 in which one auxiliary rope is linearly arranged. It is good also as a structure which connects between. In addition, the main rope, the auxiliary rope, and the vertical rope in the present invention can use any material such as a wire rope, a synthetic resin rope, a plant and animal rope, and the cross-sectional shape thereof is not limited to a circle, but may be a band shape or other. It may be something. In short, any long material having flexibility or flexibility may be used.

In the embodiment, the main rope 2 is attached via the connecting member 7 to the tubular body 5 covering the outer periphery just below the ground of the anchor 3, but may be attached directly to the tubular body 5, or It may be directly attached to the anchor 3. Further, the anchor 3 may be attached to a portion above the support plate 4. Further, it may be attached to the support plate 4. In addition, auxiliary rope 1
3 is not limited to the case where it is attached to the anchor 3 with an annular ring at the end, it may be attached to the anchor 3 by other means, or it may be attached to the support plate 4. It is also possible to attach to the anchor 3.

[0024]

According to the slope stabilization method of the present invention, the anchor is installed along the main rope at the stage where the main rope is vertically arranged on the slope, so that the accuracy of the installation position of the anchor is not required much. In addition, the positioning of the anchor becomes extremely easy, and the work efficiency is improved.

According to the second aspect, since the auxiliary rope connects the anchors adjacent to each other obliquely in the diagonal direction, the effect of retaining the anchors works more effectively than when connecting the anchors adjacent to each other in the horizontal direction.

According to the third aspect of the present invention, the main rope is attached to the cylindrical body lower than the support plate, so that a downward tension can be applied to the main rope, and the ground holding effect of the main rope is improved.

According to the fourth aspect, the main rope pulled from the upper part to the lower part of the slope can be attached to the anchor as it is (that is, the main rope is straight), the attachment of the main rope to the anchor is easy, and the workability is improved. Is improved.

According to the fifth aspect, since the two auxiliary ropes also serve as support members for supporting both edges of the net, the effect of holding the ground by the net can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a main part of a slope subjected to a slope stabilization method according to one embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view taken along the line CC of FIG. 2;

FIG. 5 is an enlarged view for explaining an aspect in which the heads of two anchors adjacent to each other obliquely in FIG. 1 are connected by an auxiliary rope.

FIG. 6 shows an embodiment of claim 5, wherein four adjacent
It is a top view which shows the mode which extended the net to the rhombus-shaped part enclosed by four auxiliary ropes which connected one anchor.

FIG. 7 is a schematic sectional view of a slope stabilizing structure according to still another embodiment of the present invention.

FIG. 8 is an enlarged view of a main part for explaining the operation of the shock absorber in the slope stabilizing structure of FIG. 7;

9 shows a specific example of the shock absorber in FIG. 7,
It is a top view near a shock absorber.

FIG. 10 is a view showing another example of the pile in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 slope 2 main rope 3 anchor 3b screw hole 4 support plate 4a hole 5 cylindrical body 5a flange 7 connecting member 8 mounting portion 8a band 8b bolt 9 gripping portion 9a set bolt 11 washer 12 nut 13 auxiliary rope 14 cap 14a hole 15 Bolt 18 Coil spring (elastic member) 19 Stopper pin 20 Extension restriction plate 20a Restriction groove 22 Net 24, 24 'Pile 24'a Blade 25 Buffer device 26 Vertical rope

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takato Inoue 1-4-2-705 Shinmachi, Hoya-shi, Tokyo F-term (reference) 2D044 DB01 DB41

Claims (5)

[Claims] 1. A plurality of main ropes are arranged at an interval in the lateral direction of the slope from the upper part to the lower part of the slope, and then anchors are installed at appropriate intervals along the main ropes. Work to attach the support plate to the head, work to connect the main rope to the anchor head or the support plate, work to forcibly sink the support plate so that the ground support force acts on the anchor, and diagonally or horizontally A slope stabilization method characterized by performing work of connecting the heads of anchors arranged in a direction with an auxiliary rope. 2. An arrangement of the anchors wherein the anchors adjacent to each other in the lateral direction of the slope are staggered vertically displaced from each other, and the heads of the diagonally adjacent anchors are connected by an auxiliary rope. The slope stabilization method according to claim 1. 3. A slope stabilization structure constructed by the slope stabilization method according to claim 1, wherein a short tubular body is placed on the outer periphery immediately below the ground surface of the anchor before attaching the supporting plate to the installed anchor. And a main rope connected to the cylindrical body directly or via a connecting member. 4. The connecting member according to claim 1, further comprising: a portion for attaching the anchor to the outer periphery of the anchor; and a grasping portion integrally provided with the attaching portion for grasping a linearly extending main rope. 3. The slope stabilizing structure according to 3. 5. A slope stabilization structure constructed by the slope stabilization method according to claim 1, wherein a net is arranged in each mesh portion formed by the auxiliary rope, and an edge of the net is attached to the auxiliary rope. Slope stabilizing structure.