KR20140076889A - Soil nail assembly and Method for reinforcing slopes using the same - Google Patents

Abstract

The present invention relates to a soil nailing structure using a geotextile and a slope reinforcing method using the same which comprises a boring step for forming a bored hole by boring a slope to be reinforced; an installing step for installing the soil nailing structure in the bored hole; a filling step for filling a grout material in the bored hole using the soil nailing structure; and a step for curing the grout material filled in the bored hole. The soil nailing structure according to an embodiment of the present invention comprises a reinforcing material lengthened in one direction and inserted into a bored hole on a slope; a bearing plate inserted into the head of the reinforcing material and mounted on the slope having the bored hole formed thereon; and a spacer arranging the reinforcing material in the center of the bored hole and combined with the reinforcing material, wherein the reinforcing material is made of a band shaped geotextile.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a sole nail structure and method for reinforcing slopes using the same,

The present invention relates to a slope reinforcement method for stabilizing and reinforcing a slope and a structure used in the slope reinforcement method. More particularly, the present invention relates to a soilless nail structure for reinforcing a slope by being inserted in a perforation hole formed in an inclined surface, The present invention relates to a slope reinforcement method.

Soil nailing method is a method to reinforce the slope by drilling holes at a recognized interval and inserting reinforcing bars into the holes to improve the stability of the slope caused by natural slope or excavation with high risk of collapse. This soil nailing method increases the resistance to tensile stress, shear stress and bending moment of the applied ground, and accordingly improves the stability against slope failure during excavation work and completion of excavation work. (Hereinafter, a structure such as a reinforcing bar to be inserted into the perforation hole and a structure such as a pivot plate is referred to as a 'nail structure', and a slope reinforcing pile formed by grouting after the nail insertion is referred to as a 'sole nail').

The conventional soil nailing method generally includes a step of forming a perforation hole by drilling a slope that requires reinforcement, a step of inserting a reinforcing steel or steel pipe into the perforation hole, a step of grouting the perforation hole, and a finishing step of closing the entrance of the perforation hole Lt; / RTI >

However, in the conventional soil nailing method, reinforcing steel or steel pipe is used as a reinforcing material. However, when steel or steel pipe is used, there is a problem that it is not economical. Recently, as the price of raw materials has increased, the non-economical efficiency of slope reinforcement through soilless nailing has been increasing.

Further, when reinforcing steel or steel pipe is used as a reinforcing material, there is a problem that the strength of adhesion between the reinforcing material and the grout material filling the perforation hole is not high and the strength of the soil nail is lowered.

The object of the present invention is to solve the above problems and provide a soil nail structure improved in structure so that it can be economically constructed by using geoscientific fibers as a reinforcing material, The present invention provides a slope reinforcement method using the slope.

According to another aspect of the present invention, there is provided a slope reinforcement method using a soil nail structure, comprising: a drilling step of drilling an inclined surface to be reinforced to form a perforation hole; mounting a soil nail structure in the perforation hole; A filling step of filling grout material into the perforation hole using the soil nail structure, and a curing step of curing the grout material filled in the perforation hole, wherein the soil nail structure used in the slope reinforcement method is one- A reinforcing member inserted into the perforation hole of the slope formed to be elongated, a support plate fitted to the slope of the reinforcing member and formed with the perforation hole, and a reinforcing member disposed at a central portion of the perforation hole, And the reinforcing material is composed of a band-like geosynthetic fiber.

In the present invention, the geoscientific fiber comprises a plurality of wrinkled portions arranged in parallel and made of a fiber bundle of polyester material, and a coating portion of a polyethylene material which is wrapped around the core portions.

In addition, in the present invention, it is preferable that convexo-concave portions are formed on the outer surface of the geoscientific fiber so as to increase the adhesion with the grout material.

In addition, in the embodiment of the present invention, the pressure plate is provided with at least one through-hole through which the geoscientific material is inserted, and an injection hole into which the injection hose for filling the grout material is inserted, Wherein the supporting bar is wound on the supporting bar and is inserted into the perforation hole through the through hole in two layers.

Further, in one embodiment of the present invention, it is preferable that the supporting bar is formed with a curved outer surface on which the geo-fiber is wound so as to prevent the geo-fiber wound on the supporting bar from being damaged.

In a specific embodiment, the through-holes may be formed in the support plate, and the ground fibers may be wound on the support bar and inserted into the perforation holes through the through holes.

According to an embodiment of the present invention, there is further provided an auxiliary stiffener which is elongated in one direction and inserted in the perforation hole and whose head is fixed to the pressure plate, wherein a thread is formed on the outer peripheral surface of one end of the auxiliary stiffener, And a nut member which is threaded and rotatably brought into close contact with the support plate.

In addition, a slit is formed in the spacer through the gap between the upper portion and the lower portion so that the geo-fiber can be fitted.

The piercing plate is provided with at least one through hole into which the geoscientific material is inserted and an injection hole into which the injection hose for filling the grout material is inserted. The injection hole is formed long in one direction and inserted into the perforation hole, The injection holes are formed in the spacers to fit the injection hoses and the coupling holes into which the auxiliary stiffeners are inserted are formed in the spacers.

In the present invention, the auxiliary stiffener and the injection hose are installed together to inject the grout material into the perforation hole through the injection hose. In another embodiment, the injection pipe is provided in which a plurality of injection holes are formed without the auxiliary stiffener , And the grout material may be charged into the perforation hole through the injection pipe.

The grout material is preferably a high-strength grout to prevent bleeding.

When the soil nail structure using the geosynthetic fiber according to the present invention is applied to the slope reinforcement method, it is advantageous in that it can be economically and simply performed without lowering the strength as compared with the case of using a conventional reinforcing steel or steel pipe as a reinforcing material have.

In addition, the adhesive strength between the grout material and the geosynthetic fiber is increased due to the unevenness formed on the surface of the geosynthetic fiber as well as the material of the geosynthetic fiber itself, thereby further strengthening the strength of the soil nail.

1 is a schematic perspective view of a soil nail structure according to an embodiment of the present invention.
Fig. 2 is a view for explaining the geotextile shown in Fig. 1. Fig. .
FIG. 3 is a view for explaining the support plate and the support plate shown in FIG. 1. FIG.
FIG. 4A is a schematic perspective view of the spacer shown in FIG. 1, and FIG. 4B is a schematic cross-sectional view taken along line 4B-4B of FIG. 4A.
5 is a schematic cross-sectional view of a soil nail structure according to another embodiment of the present invention.
6 to 9 are schematic views for explaining a slope reinforcement method according to an embodiment of the present invention.

Hereinafter, a soil nail structure and a slope reinforcement method using the soil nail structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of a soil nail structure according to an embodiment of the present invention. FIG. 2 is a view for explaining the geotextile shown in FIG. 1, and FIG. 3 is a cross- And Figs. 4A and 4B are a schematic perspective view and a cross-sectional view of the spacer shown in Fig.

First, referring to FIGS. 1 to 4B, a soil nail structure according to the present invention will be described. The sheet nail structure 100 according to the present invention includes a reinforcing member 10, a support plate 20, and a spacer 30.

The reinforcing member 10 is inserted in a perforation hole formed by excavating a ground on an inclined plane (hereinafter referred to as a slope) to reinforce the inclined plane ground. In the conventional soil nailing method or the soil nail structure, reinforcing steel or steel pipe is used as the reinforcing material, but in the present invention, a long formed geosynthetic fiber is used as a reinforcing material. That is, the use of reinforcing bars or steel pipes is not economical due to an increase in raw material cost as described in the prior art, and also has poor adhesion with grout materials. Therefore, in the present invention, reinforcing rods or steel pipes are used as reinforcing materials while showing the same strength, economically advantageous, and excellent adhesion to grout materials.

As shown in Fig. 2, the geoscientific fiber used in the present invention is composed of a plurality of wick portions 11 and a coating portion 12 surrounding the wick portions 11. As shown in Fig. The wick 11 is made of a polyester fiber bundle and is disposed in close proximity to each other. Although five wicks are disposed in this embodiment, the number of wicks can be varied depending on the strength level required in the reinforcement method. The coating portion 12 is made of a polyethylene material and surrounds the plurality of wick portions 11. [ In addition, the surface of the coating portion 12 is formed with convex-concave portions 13 convexly and convexly. As the surface of the coating portion 12 is rugged by the irregularities 13, the adhesion force between the grout material and the geosynthetic fibers increases.

In this embodiment, the geosynthetic fiber has a width of about 50 mm and a thickness of about 4.8 mm. When the geosynthetic fiber is used in two layers, it can withstand a force of about 70 KN. That is, when two double-layer geosynthetic fibers are used, the ordinary reinforcing bar can withstand a force of 140 KN, so that the strength of the ordinary reinforcing bar can withstand approximately 110 KN. Thus, using two geosynthetically- . In the case of a steel pipe which is often used as a reinforcing material, since the strength is also about 147 KN, almost the same strength as that in the case of using the geosynthetic fiber as in this embodiment appears. However, there is an advantage that the geosynthetic fibers are remarkably economical compared to steel pipes as well as reinforcing bars.

As described above, in order to wind up the geosynthetics in two layers, a piercing plate 20 having a unique configuration is required.

As shown in FIG. 3, the pressure plate 20 is formed in a thin plate shape, and at least one through hole 21 for fitting the geoscientific fibers 10 is formed. In this embodiment, since two pieces of geoscientific fibers are required, two through holes 21 are also formed in the pressure plate 20. [ The through holes 21 are elongated in the shape of a slot so that the geoscientific fibers can be inserted.

A through hole (21) is provided with a support bar (22). The supporting bar 22 is disposed on the outside of the through hole 21 and the geoscientific fibers 22 are wound on the supporting bar 22 and inserted into the perforation hole through the through hole 21 in two layers. The supporting bar 22 may be manufactured in a state in which it is fixed to the pressure plate 22 from the beginning and the supporting bar 22 may be joined to the pressure plate 22 by means of welding or the like in the field as in the present embodiment .

The outer surface of the support bar 22 is curved. When the outer surface of the supporting bar 22 is angled, the geoscientific fibers 10 may be damaged at the corners thereof. In this embodiment, the support bar 22 is made of steel and has a cylindrical shape.

The piercing plate 20 is provided with an injection hole 23 and a coupling hole 24. The injection hole 23 is for inserting an injection hose for injecting the grout material into the perforation hole formed in the ground, and the coupling hole 24 is for securing the auxiliary reinforcement 50 to be described later. The coupling hole 24 is disposed between the two through holes 21, that is, the center portion of the pressure plate 20, and the injection hole 23 is disposed at the lower end of the coupling hole 24.

The auxiliary stiffener 50 functions to reinforce the strength of the soil nail structure 100 by supporting the geosynchronous fiber 10 and serves to spread the geosynchronous fiber 10 straightly without being bent in the perforation hole do.

The auxiliary stiffener 50 is made of reinforcing steel, and its head portion (front end portion) is fitted in the coupling hole of the pressure plate 20. [ A screw thread is formed on the outer peripheral surface of the distal end portion of the auxiliary stiffener 50, and the nut 51 is screwed. The nut 51 is in close contact with the back surface of the pressure plate 20, that is, the surface facing the perforation hole in both surfaces of the pressure plate. When the nut 51 is rotated in place, the auxiliary stiffener 50 is unidirectionally or otherwise As shown in FIG.

When the nut 51 is rotated in one direction in this state, the auxiliary stiffener 50 moves toward the perforation hole and the spacers 30 are rotated in the same direction as the auxiliary stiffener 50 and the geoscientific fibers 10 are fixed to the spacer 30. [ The geoscientific fibers 10 fixed to the spacer 30 are also stretched without being bent while being strained.

The spacer 30 is intended to allow the geoscientific fiber 10, which is a reinforcing material, to be located at the center without being biased on one side of the perforation hole. The spacer 30 has a width slightly smaller than the width of the perforation hole, and the slit 31 is formed through the gap between the upper portion and the lower portion so that the geosynthetic fiber 10 can be inserted into the center portion. In the present embodiment, since the geosynthetic fibers 10 have a total of four strands, four slits 31 are formed.

In the present embodiment, the spacer 30 is formed in an egg shape, and the cross-sectional width of the thickest portion is similar to the inner diameter of the perforation hole. When the spacer 30 is inserted into the perforation hole, There is little gap, so that the two geoscientific fibers 10 can be installed symmetrically without being biased on either side of the perforation hole 10. [ That is, when only one geosynthetic fiber is installed, the geosynthetic fibers are fitted to the central portion of the spacer so as to be placed at the center of the perforation hole. In the case where two geosynthetic fibers are provided as in the present embodiment, The geosynthetics are installed symmetrically on both sides so that the geosynthetic fibers can be positioned at the center without being biased on one side of the perforation hole.

In the center of the spacer 30, an injection hole 32 through which the injection hose can be inserted and a coupling hole 33 into which the auxiliary stiffener 50 is fitted are formed. The geosynthetic fiber 10, the auxiliary stiffener 50 and the injection hose are fitted and fixed to the spacer 30.

The soil nail structure 100 having the above-described structure is advantageous in that it is excellent in strength as well as being economical and easy to install as compared with reinforcing materials such as conventional reinforcing bars using geoscientific fibers.

The sole nail structure 100 described above with reference to the drawings is an example of the present invention, and various modifications are possible.

For example, although the supporting bar described above is provided with the support bar and the geosynthetics are described as being two-ply overlapped, it is also possible to install the geosynthetics in one layer without overlapping the geosynthetic fibers, have. That is, in the present invention, the geosynthetic fiber is used as a reinforcing material of the soil nailing method, and the geosynthetic fiber can be installed on the plasterboard in various forms as long as the head portion of the geosynthetic fiber is fixed to the plaster.

In addition, although the auxiliary reinforcement and the injection hose are described as being installed in the above embodiment, the auxiliary reinforcement may not be installed in the alternative embodiment 200 shown in FIG. 5, and a flexible material An injection pipe 40 may be provided. The injection pipe 40 is fastened with the nut 41.

The injection pipe 40 is provided with a plurality of injection holes 42 to inject the grout material through the inside of the injection pipe 40 and to fill the holes with the grout material through the injection holes 42. The other components in the embodiment shown in FIG. 5 are completely the same as those in the embodiment 100 described with reference to FIG. 1 to FIG. 4B, and thus a detailed description thereof will be omitted.

Hereinafter, a slope reinforcement method for stabilizing a slope using the soil nail structures 100 and 200 having the above-described structure will be described with reference to the drawings.

6 to 9 are schematic views for explaining a slope reinforcement method according to an embodiment of the present invention.

6 to 9, the slope reinforcing method according to an embodiment of the present invention is basically the same as the conventional soil nailing method. However, it is characterized in that the soil nail structure 100, 200 having the above-described structure is used as the soil nail structure.

That is, in the slope reinforcement method, the slope s to be stabilized is excavated to form the perforation hole h as shown in Fig. The perforation hole (h) has an inclination of 10 to 20 DEG with respect to a substantially horizontal plane. The slime generated at the time of excavation should be clayed in principle. Depending on the method, a part of the slime may be used by stirring with a grout material (m) to be described later.

When the punching is completed, as shown in Fig. 7, the soil nail structure 100, 200 having the above-described structure is assembled and inserted into the perforation hole h. The soil nail structure 100 in which the auxiliary stiffener 50 is installed rotates the nut 51 to move the auxiliary stiffener 50 toward the perforation hole h so that the geoscientific fiber 10 is straightened.

When the soil nail structures 100 and 200 are inserted into the perforation hole h, the grout material m is charged into the perforation hole h through the injection hose i or the injection pipe 40. In the present invention, a high-strength grout material is used to suppress bleeding instead of a general mortar as a grout material.

When charging of the grout material is completed, the grout material m is fully cured as shown in Fig. 9, waiting for the grout material m to harden, thereby completing the slope reinforcement method.

As described above, when the soil nail structure 100 or 200 according to the present invention is used in the slope reinforcement method, it is very economical and simple to perform the process without lowering the strength as compared with the case of using a conventional reinforcing bar or steel pipe There is an advantage that it can be.

In addition, not only the material of the geosynthetic fiber itself but also the unevenness 13 formed on the surface of the geosynthetic fiber increases the adhesion between the grout and the geosynthetic fiber, thereby further enhancing the strength of the soil nail.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

100,200 ... Soil nail structure 10 ... Stiffener (Geosynthetic fiber)
11 ... core part 12 ... coating part
13 ... concave / convex portion 20 ... pressure plate
21 ... through hole 22 ... support bar
23 ... Injection ball 24 ... Combination ball
30 ... Spacer 31 ... Slit
32 ... injection hole 33 ... engagement hole
40 ... injection pipe 41, 51 ... nut
42 ... minute hole 50 ... auxiliary stiffener
s ... inclined surface h ... perforated hole
m ... Grout material i ... Injection hose

Claims (13)

A reinforcing member which is elongated in one direction and inserted in the perforation hole of the slope,
A pressure plate fitted to the head portion of the reinforcing member and fixed to a slope formed with the perforation hole,
Wherein the reinforcing material is disposed at a central portion of the perforation hole and is provided with a spacer coupled to the reinforcing material, and is used in the soil nailing method,
Wherein the reinforcing material is composed of a band-like geosynthetic fiber. The method according to claim 1,
Wherein the geosynthetic fiber comprises a plurality of wrinkled portions formed of a fiber bundle of polyester material arranged in parallel and a coating portion of a polyethylene material wrapped around the core portions. The method according to claim 1,
Characterized in that an outer surface of the geoscientific fiber is formed with convex-concave portions The method according to claim 1,
Wherein at least one through hole through which the geosynthetic fiber is inserted and an injection hole through which the injection hose for filling the grout material are inserted are formed in the pressure plate,
Further comprising a support bar for supporting the geoscientific fiber by winding it,
Wherein the geosynthetic fiber is wound on the supporting bar and is inserted into the perforation hole through the through hole in two layers. 5. The method of claim 4,
Wherein the support bar has a curved outer surface on which the geo-fiber is wound so as to prevent the geo-fiber wound on the support bar from being damaged. 5. The method of claim 4,
Two through holes are formed in the above-mentioned pressure plate,
Wherein the geosynthetic fibers are wound on the supporting bars and inserted into the perforation holes through the respective through holes in two layers. The method according to claim 1,
Further comprising an auxiliary stiffener which is elongated in one direction and inserted into the perforation hole and whose head is fixed to the pressure plate. 8. The method of claim 7,
Wherein the support plate is formed with a coupling hole into which the auxiliary stiffener is inserted,
A thread is formed on the outer peripheral surface of the one end of the auxiliary stiffener,
Further comprising a nut member screwed to the auxiliary stiffener and rotatably attached to the support plate. The method according to claim 1,
Wherein the spacer is formed with a slit extending in a longitudinal direction between the upper portion and the lower portion so that the geo-fiber can be inserted into the spacer. The method according to claim 1,
The piercing plate is provided with at least one through hole into which the geoscientific material is inserted and an injection hole into which the injection hose for filling the grout material is inserted. The injection hole is formed long in one direction and inserted into the perforation hole, And an auxiliary reinforcing member,
The slit is formed in the spacer along the longitudinal direction so as to pass between the upper portion and the lower portion so that the geo-fiber can be fitted,
Wherein the spacer is formed with an injection hole into which the injection hose is inserted and a coupling hole into which the auxiliary reinforcement is inserted. The method according to claim 1,
Wherein the piercing plate includes at least one through hole through which the geoscientific material is inserted, an injection hole formed in one direction and inserted into the perforation hole, and an injection pipe through which the head is fixed to the pressure plate,
The slit is formed in the spacer along the longitudinal direction so as to pass between the upper portion and the lower portion so that the geo-fiber can be fitted,
Wherein the spacer has a coupling hole in which the injection pipe is inserted,
Wherein the injection pipe has a plurality of injection holes formed therein so that the grout material can be injected thereinto. A hole forming step of forming a hole in the perforation hole by drilling an inclined surface to be reinforced; mounting a soil nail structure in the perforation hole; filling the grout material in the perforation hole by using the soil nail structure; And a curing step of curing the grout material filled in the perforation hole, the slope reinforcement method using a soil nail structure,
Wherein the soil nail structure is the soil nail structure according to any one of claims 1 to 11. 13. The method of claim 12,
Wherein the grout material is a high-strength grout material.

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