JP2001020281A - Method and apparatus for stabilizing ground surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly anchor a tensile member to the ground by a method wherein the tensile member is inserted into a drilled bore, an expansion member is expanded by an expansion operating member with a tightening force applied, and the expansion member is fixed to the bore wall. SOLUTION: A tensile member 1 is inserted into a bore A drilled down to a specified depth. An expansion operating member 2 is provided at the front end of the tensile member 1. Furthermore, an expansion member 5 which expands in accordance with a tightening of the tensile member 1 is provided at the outside of the expansion operating member 2. Then, a screw part 15 of the tensile member 1 is penetrated through a through hole 14 of a plate 13 laid over a pressure-receiving member 11, and a tightening force is applied with a nut 16 turned. Then, while the expansion member 5 is expanded by the expansion operating member 2, the outer circumferential face of the expansion member 5 is stuck to the bore wall of the bore A and at the same time, a tension is applied to the tensile member 1. Therefore, the pressure-receiving member 11 is pressed intensely against the ground surface. Thereby, the tensile member 1 can be anchored quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the possibility of collapse due to rainwater runoff if the topsoil, such as the slope of an expressway, the flooded slope of a dam, or the slopes of various other facilities created by the open-cut method is used. The present invention relates to a method and a device for stabilizing a certain ground.

[0002]

2. Description of the Related Art The simplest conventional stabilization method is a method in which a stabilizer such as mortar or cement milk is applied to or sprayed on a slope. In addition, a concrete layer is provided on the sloping ground, a hole penetrating this layer is provided deep in the ground, a pulling member such as a steel rod is inserted into this hole, and pulling is performed using an anchor head provided on the ground A method of applying tension to a member and injecting and setting a grout material such as mortar or cement milk into a hole and the like has been implemented.

[0003]

In the conventional method as described above, the lower end of the tension member must be fixed in the ground to apply a tensile load to the tension member. For this reason, conventionally, there is a method of making a hole in the rock with a drill bit at the lower end of the pulling member and fixing the bit to the rock, but this method buries a bit made of expensive hard material in the ground. It is uneconomical, and if the bed of rock is deep, digging must be performed while adding a tensile member, so that it is extremely troublesome and costly, and the construction period is prolonged.

[0004] Further, a pulling member is inserted into a hole excavated to a predetermined depth from the ground, grout material is injected into this hole,
After the grout material is cured and the tension member is fixed, there is also a method of adding tension to the tension member,
This method has a problem in that it takes a long time for the grout material to harden, so that it takes a long time for construction.

[0005] Therefore, an object of the present invention is to provide a method capable of quickly fixing a pulling member underground without waiting for hardening of a grout material and using an expensive bit, and a method for implementing the method. It is to provide a device.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a pressure receiving structure which is inserted into a hole excavated from the ground to a predetermined depth in the ground, and which is placed on the ground. An extension member fitted on the outside of the tension member by an expansion action member provided on the tension member while applying a tension to the tension member by appropriate means. A ground stabilization method is adopted in which the expanding and expanding member is fixed to the hole wall of the hole while expanding the hole.

[0007] In addition, the expanding member and the expanding member may be arranged at a plurality of positions on the pulling member.

Further, a hole excavated from the ground to a predetermined depth in the ground, a pulling member inserted into the hole, and placed on the ground, and the ground end side of the pulling member is passed through the central through hole. A pressure receiving structure, a tapered expansion member provided on the tension member having an enlarged lower portion, an expansion member fitted outside the expansion member, and a pressure receiving member provided on the ground end side of the tension member. Appropriate tensioning means provided in an engagement relationship with the structure, and an apparatus for expanding the expansion member by the expanding member while tensioning the tension member by operating the tensioning means. .

[0009] In addition, a plurality of the expanding action members and expanding members may be provided on the pulling member.

[0010] Further, a slip resistance portion which bites into the hole wall may be provided on the outer peripheral surface.

In addition, a plurality of slits extending from one end to the other end may be formed in the cylindrical member to provide an expanding member, or a plurality of divided bodies may be arranged in a cylindrical shape, and the outer periphery may be expanded and contracted by an elastic member. A member may be provided.

[0012]

Embodiments of the present invention will be described with reference to the accompanying drawings.

In the first embodiment of the present invention, as shown in FIGS. 1 and 2, reference numeral 1 denotes a pulling member which is inserted into a hole A formed by excavating from the ground to a predetermined depth in the ground. The distal end of the member 1 is provided with a tapered expanding member 2 having a greater degree of protrusion toward the distal end.

In the fixing of the expanding member 2, the distal end of the pulling member 1 such as a steel rod or a wire is inserted into the central through hole 3 in the case shown in the figure, and then the wedge 4 is driven into the center. The expansion action member 2 is fixed, but other means,
For example, it may be fixed by swaging or welding.

An expansion member 5 which expands in the circumferential direction with the tension of the pull member 1 is provided outside the expansion member 2.
Is provided.

As shown in FIG. 2, the expanding member 5 has a cylindrical body 7 having a tapered hole 6 having a diameter gradually increasing toward the distal end, and a cylindrical body 7 having a plurality of equally spaced distal end surfaces. 7
And a slit 8 that is inserted toward the end portion of

As described above, first, the expanding member 2 is inserted into the hole A.
The tension member 1 fitted with the extension member 5 is inserted into the outside of the member. At this time, the distal end (the end on the ground side) of the pulling member 1 is passed through the center hole 12 of the pressure receiving structure 11 made of concrete or the like placed on the ground.

Next, a tension is applied to the pressure receiving structure 11 at the distal end side of the pulling member 1 so as to be engaged.

As means for applying the tension, as shown in FIG. 1, a threaded portion provided at the end of the pulling member 1 in the through hole 14 at the center of the metal plate 13 superposed on the surface of the pressure receiving structure 11 15, and the tension is applied while rotating the nut 16 screwed into the screw portion 15. However, other means such as the tension member 1 are used.
May be performed by a method (not shown) in which a wedge is driven into a long hole at the terminal end of the device.

Then, the expansion member 5 is expanded by the expansion member 2 that gradually bites into the tapered hole 6 with the tension of the pull member 1, and the outer peripheral surface of the expansion member 5 is formed on the hole wall of the hole A with the expansion. Bites firmly,
The tension is applied to the tension member 1.

For this reason, the pressure receiving structure 11 is strongly pressed against the ground.

After that, a grout material such as mortar may be injected into the hole A for reinforcement or rust prevention.

In the second embodiment of the present invention, as shown in FIG. 3, a plurality of expanding members 2 (in series) of a pull member 1 are provided.

Of course, an expanding member 5 is fitted outside each of the expanding members 2.

Then, the tension member 1 can be firmly fixed to the hole A by expanding the plurality of expansion members 5.

In the third embodiment of the present invention, a slip resistance portion 21 is provided on the outer peripheral surface of the expansion member 5 as shown in FIG.

Although the above-mentioned slip resistance portion 21 is provided with irregularities in the outer peripheral direction in the case of the drawing, it may be a projection (claw) or the like.

Then, the slip resistance portion 2 is formed on the hole wall of the hole (A).
1 is bitten and good fixing, that is, the degree of safety is increased.

In the fourth embodiment of the present invention, as shown in FIGS. 5 and 6, the cylinder forming the expansion member 5 is divided into a required number, and the divided bodies 31 are arranged in a cylindrical shape. ,
An endless elastic member 32 is fitted on the outside of the member and joined (in a bound state).

Then, the expanding member 5 is expanded by the expanding member 2.
When each of the divided bodies 31 is expanded while the expansion and contraction member 32 is expanded, the divided bodies 31 are moved at right angles to the axis, and the entire outer surface of each divided body 31 is pressed against the hole wall.

Although a coil spring is used for the elastic member 32 in the illustrated embodiment, rubber band or the like may be used.

It is preferable that the elastic member 32 is fitted in the groove 33 so as not to interfere.

The extension member 5 is formed of metal or other material.

[0034]

According to the present invention, the expansion member outside the expansion member provided on the pulling member is expanded as described above, and the expanded member is pressed against the hole wall of the hole. The tension member can be quickly fixed.

For this reason, it is possible to eliminate the inconvenience that the time required for injecting the graft material, applying tension after curing of the graft material, and stabilizing the slope with the pressure receiving structure becomes longer as in the conventional case.

Further, the plurality of expansion members can stabilize the fixing more stably, and the resistance portion can bite against the hole wall.

Further, the divided body joined by the elastic member can stably press against the hole wall.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a first embodiment of the present invention.

FIG. 2 is a longitudinally enlarged side view showing a main part of the above.

FIG. 3 is a longitudinal sectional side view showing a second embodiment.

FIG. 4 is a side view showing a third embodiment.

FIG. 5 is a perspective view showing a fourth embodiment.

FIG. 6 is a longitudinal sectional side view of the above.

[Explanation of symbols]

 A hole 1 Pulling member 2 Opening / expanding member 3 Through hole 5 Expansion member 6 Taper hole 7 Cylindrical body 8 Slit 11 Pressure receiving structure 12 Center hole 13 Plate 14 Through hole 15 Screw portion 16 Nut 21 Resistance portion 31 Split body 32 Elastic member

Claims (7)

[Claims] 1. A pulling member is inserted into a hole excavated from the ground to a predetermined depth in the ground, and a ground-side end of the pulling member is passed through a pressure receiving structure placed on the ground. Fixing the expansion member to the hole wall of the hole while expanding the expansion member fitted on the outside by the expansion member provided on the tension member while applying tension by appropriate means. The ground stabilization method characterized by the following. 2. The ground stabilizing method according to claim 1, wherein the expanding member and the expanding member are arranged at a plurality of positions of a tension member. 3. A hole excavated from the ground to a predetermined depth in the ground, a pull member inserted into the hole, and placed on the ground, and the ground end side of the pull member is passed through a central through hole. A pressure receiving structure, a tapered expansion member having an enlarged lower portion provided on the tension member, an expansion member fitted outside the expansion member, and a pressure receiving member provided on the ground end side of the tension member. A tensioning means provided in engagement with the structure, wherein the expansion member is expanded by the expanding member while the tension member is tensioned by operating the tensioning means. Ground stabilizer to do. 4. The ground stabilizing device according to claim 3, wherein a plurality of the expanding action members and the expanding members are provided on the pulling member. 5. The expansion member according to claim 1, wherein a slip resistance portion that bites into a hole wall is provided on an outer peripheral surface. 6. The expansion member according to claim 1, wherein a plurality of slits extending from one end to the other end are provided in the tubular member. 7. A plurality of divided bodies are arranged in a cylindrical shape,
The expansion member according to any one of claims 1 to 5, wherein the outer periphery is connected by an elastic member.