JPH09111761A - Bearing pressure metal fitting for stabilizing slope and slope stabilizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a work at a site when a stabilization method for a slope is applied. SOLUTION: Bearing pressure metal fitting 10 is made of a steel, a short pipe 13 is securely erected on the central part of a ground touching plate 12, and leg plates 14 for reinforcement are arranged. The ground touching plate 12 has a through-hole 12a formed in a central part and through which a rock bolt 11 is inserted. The leg plate 14 has a notch part 14a, through which a wire 25 is inserted and which is formed in a contact part between the ground touching plate 12 and the short pipe 13. By penetrating the rock bolt 11 in a ground, the rock bolt is anchored on a foundation bedrock 15. The bearing pressure hardware 10 is fitted in the rock bolt 11, and by fastening by means of a nut 22, a ground support force (a bearing pressure) by the tension force of the rock bolt 11 is exerted on the bearing pressure metal fitting 10. Further, for example, arranged two bearing pressure metal fitting 10 are coupled together under tension by a wire 25 inserted through the notch part 14a. Through the tension coupling by the wire 25, a bedrock strength is increased and a wiring work therefor is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a projecting portion of a tensile member that penetrates into the ground and performs an anchor function, and transmits the tension applied to the tensile member to the slope to stabilize the slope. Bearing for a slope stabilization method that performs heat treatment, and a slope stabilizing method using the bearing for a slope stabilization method.

[0002]

2. Description of the Related Art FIG. 11 shows an example of a conventional slope stabilization method using the above-mentioned tensile member and bearing metal (see Japanese Patent Publication No. 49-9482). In this stabilization method, a tension member 3 such as an anchor rod or an anchor rope is connected to an anchor body 2 that has penetrated into the ground of a slope 1 and has been anchored on a foundation rock, etc., and is supported on the above-ground protruding portion of this tension member 3. A tensioning force is applied to the tension member 3 by mounting a platen (corresponding to a pressure bearing metal) 4 and tightening a nut 6 screwed into a screw formed on the upper end of the tension member 3 to support this tension force. This is a construction method in which the platen 4 is transmitted to the slope to stabilize the slope. This method is
By adopting the construction method in which the bearing plate 4 is arranged in the stabilization area of the slope at an appropriate interval, it is possible to prevent the slope from collapsing without cutting trees that grow naturally on the slope. It has the following features (However, Japanese Patent Publication Sho-49-948
Invention No. 2 itself has other purposes).

The pressure bearing plate 4 in the conventional slope stabilization method is a simple flat plate shape as shown in the drawing. The slope stabilization method using a flat bearing plate is disclosed in, for example, Japanese Patent Laid-Open No. 5-112.
Also seen on 945. In the conventional method, a concrete bearing plate is generally used.

[0004]

By the way, in the case of a concrete pressure plate, even if it is flat like the conventional pressure plate 4, it is easy to secure the strength required for the pressure plate. . However, the concrete pressure plate inevitably has a large weight, and the work performed on the construction site, which is an inclined surface, becomes difficult.

In addition, as described above, this construction method uses the pressure bearing plate 4 in order to construct a tree growing on the slope without cutting it.
Are placed in the stabilization area of the slope with an appropriate interval.
At that time, a plurality of bearing plates 4 constructed on the slope are also tension-coupled to each other with a wire (not shown). It is known that by tension-connecting the bearing plates with wires in this way, the ground strength can be improved in the entire slope stabilization area. However, the conventional pressure-bearing plates 4 do not have a structure in which it is easy to tension-connect the pressure-bearing plates with each other with a wire.

The present invention has been made in view of the above circumstances, and is intended to reduce the weight by using steel bearing members to facilitate the work at the construction site performed on the inclined surface, and to support the bearing members from each other. To provide a bearing member for a slope stabilizing method capable of easily performing tension connection with a wire, etc., and a slope stabilizing method using the bearing member for the slope stabilizing method. With the goal.

[0007]

According to the present invention for solving the above-mentioned problems, the tensioning force applied to the above-mentioned tensioning member is applied to the ground surface of a tensioning member which penetrates into the ground and performs an anchor function. A bearing metal for a slope stabilization method for transmitting and stabilizing a slope. A steel short plate is provided with a hole through which the tensile member can penetrate, and a steel short plate. The pipe is vertically installed and fixed, and a reinforcing leg plate made of steel is provided between the upper surface of the grounding plate and the outer peripheral surface of the short pipe so as to vertically abut and join them.

A second aspect of the present invention is characterized in that a plurality of through holes are provided in the ground plate of the bearing metal for the slope stabilizing method of the first aspect.

A third aspect of the present invention is characterized in that the leg plate of the contact portion between the ground plate and the short pipe in the bearing metal for the slope stabilization method of the first aspect is provided with a cutout portion.

According to a fourth aspect of the present invention, there is provided a slope stabilizing method using the bearing metal according to the first aspect, wherein the rock bolt is penetrated into the ground and the tip portion thereof is fixed to the foundation rock mass. ，
The bearing metal fitting is fitted to the above-ground protruding portion of the lock bolt,
A nut is screwed through the washer to the lock bolt protruding from the upper end of the short pipe of this bearing to give a tension force to the lock bolt, and this tension is received as ground support force by the bearing metal. It is characterized by stabilizing.

According to a fifth aspect of the present invention, in the slope stabilizing method according to the fourth aspect, two or more adjoining supporting metal fittings among a plurality of bearing members arranged at appropriate intervals in the stabilization area of the slope are provided. It is characterized in that the pressure-bearing metal members are tightly connected to each other by a wire passing through a notch formed in the leg plate at the contact portion between the ground plate of the pressure-bearing metal member and the short pipe.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to the embodiment of FIG. In Figure 1,
Reference numeral 1 is a slope to be constructed by the stabilizing method, and 10 is a bearing metal for the slope stabilizing method according to an embodiment of the present invention. The bearing metal 10 is attached to a ground protrusion of a lock bolt 11 which is a tensile member that penetrates into the ground and performs an anchor function, and applies the tension applied to the lock bolt 11 to the slope 1
To stabilize the slope.

As shown in FIGS. 4 and 5, the pressure bearing metal 10 is provided with a hole 12a through which the lock bolt 11 can penetrate in the central portion of a steel ground plate 12 and is made of steel, for example. A circular short pipe 13 is erected and fixed by welding, and a reinforcing leg plate 14 made of steel is vertically abutted on and joined to the upper surface of the ground plate 12 and the outer peripheral surface of the short pipe 13. It is a structure provided with. In the illustrated example, four leg plates 14 extending from the short tube 13 in four directions at right angles are provided. The ground plate 12 of the bearing metal 10 of this embodiment is square as shown. Further, the leg plate 14 at the contact portion between the ground plate 12 and the short tube 13 is provided with a semicircular cutout 14a. The bearing metal 10 is preferably galvanized to prevent rust.

When constructing the stabilization method for the slope 1 using the bearing metal 10, first, the rock bolt 11 is inserted into the ground of the slope 1 as shown in FIGS. , The bit 11a at the tip thereof is fixed to the foundation bedrock 15.
In addition, the lock bolt 11 of the embodiment is
In order to facilitate the penetration work, the bolt pieces 11b having a length of, for example, 2 meters are sequentially connected by the coupler 11c by the required number according to the penetration depth. The lock bolt 11 is inserted by attaching the lock bolt 11 to a drill (not shown) and manually operating the drill. Then, as shown in FIG. 2, the lock bolts 11 are embedded in advance in the stabilization area of the slope 1 at appropriate intervals. Since the arrangement is performed while avoiding trees and the like, the arrangement is not necessarily the grid-like arrangement as shown in the figure. And the bit 11a at the tip of each lock bolt 11
Is filled with grout material.

Next, the above-mentioned bearing metal 10 is fitted in the short pipe 13 to the above-ground protruding portion of each lock bolt 11. Since this work is performed on a slope, it is difficult to perform the work if the weight of the pressure bearing metal 10 is heavy. However, since the weight of the pressure bearing metal fixture 10 made of steel does not need to be so large, manual work is possible. Yes, workability is good. Then, this short pipe 13
The nut 22 is screwed into the lock bolt 11 protruding from the upper end of the through the square washer 20 and the threaded spherical washer 21. Reference numeral 23 denotes a cap that covers the nut 22 after the construction is completed, and is screwed onto the threaded portion of the outer surface of the threaded washer 21.

Then, the nut 22 is tightened to tighten the washer 20.
When is pushed down, a tension force is generated in the lock bolt 11, and at the same time, the tension force is received by the bearing metal 10 in the short pipe 13 and transmitted to the slope 1 by the ground plate 12. As a result, the ground supporting force (bearing pressure) is obtained. In this case, as shown in FIG. 3, assuming that the ground supporting force of the bearing metal 10 is distributed at an angle of, for example, about 45 ° from the end of the bearing metal 10, the intervals at which the bearing metal 10 is arranged are set appropriately. As a result, the formation 16 on the foundation bedrock 15 is effectively pinched, and a desired ground supporting force can be secured. The ground support force depends on the tensile strength of the lock bolt 11,
For example, 15 to 50 ton /
A ground supporting force of m ² can be imparted.

Further, in order to increase the ground supporting force of the bearing metal 10, the two or more bearing metal members 10 adjacent to each other among the plurality of metal bearing members 10 arranged on the slope 1 at a predetermined interval. Notch 14 formed on the leg plate 14 between each other
Tension connection is made with a wire 25 of, for example, a steel wire passed through a. In FIG. 2, the wire 25 is used for tension connection between two pressure bearing members 10 such as and, and for tension connection surrounding four pressure bearing members 10 such as and. It is conceivable that the two bearing members 10 in the diagonal direction are tightly connected. Instead of the steel wire, a rope made of FRP (fiber reinforced plastic) or the like can be used.

As a connecting means for connecting both ends of the wire 25 when the wire 25 is connected by tension, for example, a wire clip 26 as shown in FIG. 6 showing details of the portion B of FIG. 2 may be used. This wire clip 26 is the wire clip body 2
The threaded portions on both sides of the U bolt 28 are passed through the two holes 27a formed in 7, and both ends of the wire 25 are sandwiched between the wire clip main body 27 and the U bolt 28 so that the nut 29 is attached to the threaded portion of the U bolt 28. Screw and tighten, wire 25
Join both ends of.

7 and 8 show another embodiment of the bearing metal. In the bearing metal 10 'of this embodiment, the ground plate 12' is circular. The other points are the same as those of the bearing metal 10 shown in FIGS.

9 and 10 show another embodiment of the bearing metal. The pressure bearing metal 10 ″ of this embodiment is the ground plate 1
2 "is a cross. Other points are the same as those of the pressure bearing metal 10 shown in FIGS.

Although not shown, the pressure bearing metal 10,
10 ', 10 "(hereinafter represented by 10) ground plate 1
It is conceivable to provide a large number of through holes in 2, 12 ', 12 "(hereinafter represented by 12). In this case, the ground plate 12
Further, the weight of the bearing metal 10 can be further reduced by the number of the through holes. In addition, after being installed on the slope 1, plants can grow from the through holes of the ground plate 12, and the installation surface of the pressure support metal 10 itself can also function as a vegetation area.

The washer receiving the tightening force of the nut 22 screwed into the lock bolt 11 is not limited to a separate member as long as it can transmit the tightening force to the short pipe 13. For example, it may be fixed to the upper end of the short pipe 13 by welding, or may be fixed to the nut itself by welding. Furthermore, when the outer diameter of the nut is larger than the outer diameter of the short pipe 13, the nut is placed directly on the short pipe 13. It does not exclude contacting the end faces.

Further, in the present invention, the lock bolt is used as the tension member which penetrates into the ground and performs the anchor function, but it is also possible to use a simple PC steel rod. Also, FIG.
Similarly to the conventional example shown in FIG. 1, it is possible to use an anchor rope or anchor rod having an anchor body at the tip. In this case, the anchor rope is not limited to a wire such as a steel wire, but an FRP rope or the like can be used.

[0024]

The bearing metal of the present invention is made of steel and has a structure including a grounding plate having a hole in the center, a short pipe in the center of the grounding plate, and a leg plate for reinforcement. It is possible to obtain a sufficiently lightweight bearing metal, which makes it extremely easy to perform work on a construction site on an inclined surface.

According to the second aspect, the weight of the bearing metal can be further reduced by the amount of the plurality of through holes formed in the ground plate. In addition, after the plant is installed on the slope, the plant can grow from the through hole of the ground plate, and the installation surface itself of the bearing metal can also function as a vegetation area.

The bearing metal according to claim 3 is used as in the construction method according to claim 5, but the wire is passed through the notch of the leg plate at the lower part of the short pipe to surround the outer peripheral surface of the short pipe. Since they can be connected to each other by tension, the wiring work is easy and the wire can be tensioned smoothly. In addition, the wire is not subject to a concentrated load, such as when it is passed through a hole formed in the ground plate, and there is no risk of the wire breaking. In addition, since the tension force of the wire acts on the short pipe, that is, at the center of the bearing metal, the tension between the bearing metal components is not tightened by the wire. The desired effect of coupling can be appropriately realized. It is also effective that the notch through which the wire passes is located at the contact portion between the short pipe and the ground plate (that is, at a low position where it contacts the ground plate) so as not to generate a moment that causes a bearing metal.

According to a fourth aspect of the present invention, a bearing metal is fitted to a rock bolt whose tip is fixed to the foundation rock, and a nut is screwed through a washer to the lock bolt protruding from the short pipe and tightened. Has good workability because the bearing metal is lightweight and the nut tightening work can be performed at a slightly higher position. Also, by making the inner diameter of the short pipe a little larger, a certain allowable range can be given to the penetration angle of the rock bolt to the slope, and within the certain allowable range, the ground bearing force averaged to the ground plate Can be given. Thus, claim 4
This construction method can make the most of the function of the bearing metal support of the present invention.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a slope stabilization method using a bearing metal for a slope stabilization method according to an embodiment of the present invention.

FIG. 2 is a plan view of a slope stabilization area where the slope stabilization method of FIG. 1 is applied.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a plan view of the bearing member in FIG.

FIG. 5 is a front view of FIG. 4;

6A and 6B show details of a wire connecting portion of a portion B in FIG. 2, where (A) is a front view of the wire clip and (B) is an exploded view thereof.

FIG. 7 is a plan view showing another embodiment of the bearing metal for the slope stabilizing method of the present invention.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a plan view showing still another embodiment of a bearing metal for a slope stabilizing method according to the present invention.

FIG. 10 is a front view of FIG. 9;

FIG. 11 is a diagram for explaining a bearing material for a conventional slope stabilization method and a slope stabilization method.

[Explanation of symbols]

 1 Slope 10 Bearing material for slope stabilization method 11 Rock bolt (tensile member) 11a Bit 12 Ground plate 12a Hole 13 Short pipe 14 Leg plate 14a Notch 15 Foundation rock 20 Square washer 21 Screw washer 22 Nut 25 Wire 26 wire clips

Claims (5)

[Claims] 1. A slope stabilization, which is attached to a ground protrusion of a tension member that penetrates into the ground and performs an anchor function, and transmits the tension applied to the tension member to the slope to stabilize the slope. A bearing metal for a chemical engineering method, in which a hole through which the tensile member can penetrate is provided at the center of a steel grounding plate and a steel short pipe is vertically installed and fixed to the upper surface of the grounding plate. A bearing metal for a slope stabilization method, characterized in that a reinforcing leg plate made of steel, which is vertically abutted against and joined to the outer peripheral surface of the pipe, is provided. 2. The bearing metal for a slope stabilizing method according to claim 1, wherein the ground plate is provided with a plurality of through holes. 3. A bearing metal for a slope stabilizing method according to claim 1, wherein a notch is provided in a leg plate at a contact portion between the ground plate and the short pipe. 4. A slope stabilization method using the bearing metal according to claim 1, wherein the rock bolt is penetrated into the ground of the slope to fix the tip of the lock bolt to the foundation rock, and the lock is secured. The support metal fitting is fitted to the above-ground protruding portion of the bolt, and the lock bolt protruding from the upper end of the short pipe of the support metal is screwed with a nut through a washer to tighten it to give a tension force to the lock bolt. A slope stabilization method characterized in that the slope is stabilized by a bearing metal that receives this tension as ground support force. 5. The ground plate of the bearing metal is provided between two or more adjacent bearing hardware of a plurality of bearing hardware arranged at appropriate intervals in the stabilization area of the slope. 5. The slope stabilization method according to claim 4, wherein the slope stabilization method is performed by tensioning the wire with a wire passing through a notch provided in a leg plate at a contact portion with the short pipe.