KR20100132222A - Reinforce unit for grouting and grouting reinforce method using the same - Google Patents

Abstract

PURPOSE: A reinforcing unit for grouting and a grouting reinforcing method using the same are provided to maintain continuous prestress in a part in which a reinforcing member and a compression joint module are installed even if compressive force is lost. CONSTITUTION: A reinforcing unit for grouting comprises two or more reinforcing members(10,20) and compression joint modules(110). The reinforcing members are inserted into boring holes. The compression joint modules are located between the reinforcing members. Compressive force is applied to the compression joint modules after a grouting work is completed.

Description

Reinforcement unit for grouting and grouting reinforcement method using the same {Reinforce Unit For Grouting And Grouting Reinforce Method Using The Same}

The present invention relates to a grouting method, and more particularly, to a grouting reinforcement unit and a grouting method using the same to provide a constant compressive force on the ground.

In general, grouting refers to stabilizing the ground by injecting a predetermined grouting material such as cement into the ground for the purpose of preventing leakage or stabilizing soil in civil works.

With the development of industrialization, the excavation of tunnels and the development of steep slopes are inevitable for the purpose of construction of roads and complexes, and stabilization measures are required to satisfy construction stability, economic feasibility, and environmental preservation.

In particular, in the excavation of tunnels for the construction of railroads or automobile roads, reinforcing methods for safe and efficient tunnel construction are required when construction is difficult due to ground conditions or water or the support effect is reduced.

To this end, a grouting method for reinforcing using a steel pipe on an excavation surface of a tunnel is widely used. The grouting method is used to drill a hole to have a predetermined angle of inclination on an excavation surface such as a tunnel, and then a plurality of grouting methods. The two steel pipes are inserted, and the grouting material is injected into the drilling holes to reinforce the surrounding ground while the grouting material is cured in the space portion between the drilling holes and the steel pipes.

That is, in the grouting method, the efficiency of the reinforcing performance is determined according to how firmly and uniformly the grouting material is injected into the empty space around the hole.

In order to increase the efficiency of the grouting method, steel pipes of various structures have been developed and used in reinforcement work.

1 and 2 are views showing a conventional general grouting method, it will be described as an example that the grouting method is applied to the upper ground of the tunnel.

First, as shown in FIG. 1, when the tunnel is constructed, a plurality of drilling holes 1 are drilled from the upper side of the tunnel to the inside of the tunnel to be reinforced to the ground above the tunnel, and then steel pipes are formed in each of the drilling holes 1. Insert (2).

As shown in FIG. 2, the ground is reinforced by filling and curing the grouting material through the pipe 8 or the like in the space between the drilling hole 1 and the steel pipe 2.

At this time, in the case of pressurized grouting to inject the grouting material at a predetermined pressure, the grouting material is inserted to the fine gap 5 around the perforation hole 1 and then hardened to allow more stable ground reinforcement.

In addition, in some cases, when the grouting is completed until the hardening operation by applying the tensile force to the steel pipe, the compressive force acts up and down on the ground to further strengthen the reinforcement work.

By the way, in the conventional grouting method, when some of the steel pipes are broken, all the prestresses of the steel pipes are released, so that the entire steel pipe has a problem in forming a structure that reinforces the ground through the compressive force.

In addition, when the tunnel is constructed after the grouting work is completed, the work to simultaneously cut to the steel pipe located up to the inside of the tunnel during the formation of the tunnel inner surface.

However, in the case of the conventional grouting steel pipe made of steel, there is a problem in that the strength thereof is strong, resulting in damage to the equipment in the case of construction work on the inner surface of the tunnel.

The present invention has been made to solve the above-mentioned problems and disadvantages, the object of the present invention is as follows.

First, even in one grouting reinforcing unit, the purpose is to compress the compressive force by a predetermined area of the reinforcing unit.

Second, the purpose is to facilitate the installation of the reinforcement unit is distributed as described above in the drilling hole is applied to the compressive force.

Thirdly, after grouting is completed, the penetrating hole is inserted to prevent a breakdown of the work tool during cutting and cutting of the reinforcing unit located up to the inner side of the tunnel, thereby enabling smooth operation.

In order to achieve the above object, the present invention is a reinforcing unit for grouting work using a punched hole formed in the ground, between at least two reinforcing members and the respective steel reinforcing members inserted into the punching hole It provides a reinforcing unit for grouting comprising a compression connection module is positioned so that the compression force is applied between the steel reinforcing member after the grouting operation is completed.

Here, the reinforcing member inserted into the drilling hole may be a reinforcing member made of a GRP material.

The compression connection module has an outer case in which one end of the reinforcing member is slidably moved along the longitudinal direction and the one end of the reinforcing member is connected to both sides of the reinforcing member in a longitudinal direction. A coupler provided to be slidably movable together with the reinforcing member inside the case and an elastic member provided inside the outer case to pull out the reinforcing member in the longitudinal direction to apply a restoring force to return to the original position. It can be configured to include.

On the other hand, the elastic member is formed of a coil spring, and provided between the pair of couplers and at the same time one side and the other side of the coil spring can be fixed to the coupler.

In addition, the elastic member is formed of a coil spring, it may be provided between the coupler and the outer case.

In addition, the outer case may be configured to further include a fixing piece to the outside of the outer case to be fixed to the inside of the drilling hole.

And, the fixing piece is hinged rotatably to the outer case, elasticity to rotate / move the fixing piece so as to abut the inner side of the drilling hole when no external force is applied to the fixing piece between the fixing piece and the outer case It may be further provided.

On the other hand, the present invention is a grouting method performed by using a grouting reinforcing unit, the step of drilling a hole in the ground, the step of filling a quick grouting material in the drilling hole, the grouting reinforcement in the drill hole filled with the quick grouting material Inserting the unit, inserting the grouting material into the boring hole into which the grouting reinforcing unit is inserted, and pulling and fixing the reinforcing unit located outside the ground in the grouting reinforcing unit inserted into the boring hole. It provides a grouting method made by.

In addition, the present invention provides a grouting method using the grouting reinforcing unit according to any one of claims 1 to 7, comprising the steps of visually drilling a tunnel, and drilling a hole in the ground from the inside of the visible tunnel. Drilling and inserting a grouting reinforcing unit having a GRP reinforcing member connected to a plurality of steel reinforcing members at one end of the drilling hole so that the GRP reinforcing member is formed toward the inside of the tunnel; And a grouting material inserted into the boring hole into which the grouting reinforcing unit is inserted, and pulling and fixing the GRP reinforcing member located inside the tunnel in the grouting reinforcing unit inserted into the boring hole. Provide a method.

Referring to the effects of the present invention grouting reinforcing unit configured as described above and the grouting reinforcement method using the same as follows.

First, by forming a reinforcing member for the grouting reinforcing unit in multiple stages and installing a compression connection module for applying a compressive force between each reinforcing member, the other reinforcing member and the prestressing, that is, the compressive force is lost in some reinforcing members and The area where the compression connection module is installed has the effect of maintaining continuous prestress.

Second, the reinforcing member inserted into the tunnel is configured to be made of a glass fiber GRP reinforcing member, there is an effect that can be flexibly installed inside the tunnel while preventing the damage of the equipment when the tunnel inner surface is installed.

Third, the anchor module is provided at each part where the reinforcing member is connected, thereby fixing the compression connection module at any position of the drilling hole, so that the compressive force can be maintained in the reinforcing member of each section.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. Note that, in the following description, components that are substantially the same in structure and function and can be handled identically can be identified by the same reference numerals.

Hereinafter, with reference to the accompanying drawings illustrating a structure according to a preferred embodiment of the present invention.

Figure 3 is a cross-sectional view showing a grouting reinforcement unit according to an embodiment of the present invention.

As shown, the grouting reinforcement unit 100 according to an embodiment of the present invention is inserted into each of the plurality of perforation holes drilled in the ground and the reinforcement members 10 and 20 connected in a plurality of divided form along the longitudinal direction It is configured to include.

At this time, the reinforcing members 10 and 20 are each made of a rod-shaped having a predetermined length, the steel reinforcing member 10 made of a steel material and the GRP reinforcing member 20 made of Glass Reinforced Plastic (GRP) material is Used.

In general, a grouting reinforcing unit is used to reinforce slopes in which a plurality of steel reinforcing members of the steel material are connected, and when the tunnel is constructed, a grouting reinforcing unit to which the GRP reinforcing member 20 is applied is installed around the inside of the tunnel. This is used and described in more detail below.

3 is a view showing a grouting reinforcing unit to which a GRP reinforcing member is applied for tunnel construction, hereinafter, a grouting reinforcing unit for tunnel construction will be described.

As shown, when the tunnel is constructed, the GRP reinforcing member 20 is positioned from the upper ground of the tunnel to be installed toward the lower construction tunnel, and other portions of the tunnel are provided with a plurality of steel reinforcing members 10. Reinforcement unit 100 is used to be connected,

To this end, it is a matter of course that the drilling operation of each of the drilling holes to be made according to the position and shape of the tunnel to be constructed in advance.

In addition, the steel reinforcing member 10 has a form in which a plurality is connected, each steel reinforcing member 10 or the GRP reinforcing member 20 and the steel reinforcing member 10 are all connected by a compression connection module 110. To form.

The compression connection module 110 is the coupler (121, 122) and one end of the reinforcing member (10, 20) is connected to one end of the steel reinforcing member 10 or GRP reinforcing member 20, respectively, after the two couplers are completed It is configured to include an elastic member 130 is installed to connect between (121, 122).

Here, the coil spring is used as the elastic member 130.

The coupler 121 and 122 and the respective reinforcing members 10 and 20 may be coupled in various ways such as by using interference fit or other coupling members.

In FIG. 3, only one form is shown, and a female screw part is formed at the coupler 121 and 122, and a male screw part is formed at one end of the steel reinforcing member 10 and the GRP reinforcing member 20 to be coupled by a screw rotation method. It is shown the form.

On the other hand, after the reinforcing member and the coupler is coupled to both sides based on the longitudinal direction of the reinforcing member is provided with an outer case 111 to enable sliding movement along the longitudinal direction of the reinforcing member.

That is, the couplers 121 and 122 may be slidably moved into the outer case 111, and one side and the other side of the coil spring 130 may be disposed between the coupler 121 and 122 inside the outer case 111, respectively. It is configured to be coupled to the coupler (121, 122).

On the other hand, the compression connection module 110 is configured to include an anchor module 101 to be fixed at a predetermined position on the inner surface of the drilling hole after the coupler (121, 122) and the elastic member 130 is inserted into the drilling hole. Here, the outer case 111 itself constitutes a part of the anchor module 101.

The outer case 111 is provided with a fixing piece 112 rotatably supported by the outer case 111 so as to be in contact with the inner surface side of the drilling hole.

In Figure 3, the fixing piece 112 is shown to be rotatably connected to the coupling structure of the hinge 118 method to the outer case 111.

At this time, a spring 115 is provided between the fixing piece 112 and the outer case 111, and the pressing band 150 surrounds the fixing piece 115 in a form in which the spring 115 is pressed. Is located.

Although not shown in detail, the fixing piece 112 is preferably provided with a plurality along the circumference of the outer case 111.

In this manner, when the pressing band 150 is separated, the fixing piece 112 is opened to the outside by the restoring force of the spring 115.

In this case, the fixing piece 112 itself may be made of a material having elasticity and may be installed outside the outer case 111 without a separate spring.

The grouting reinforcement method using the present invention grouting reinforcement unit configured as described above will be described with reference to FIGS. 4 to 8.

4 is a cross-sectional view schematically showing a hole in the upper ground for the construction of the tunnel, Figures 5 to 7 are views showing the grouting reinforcement method according to the present invention in order, Figure 8 Is a flowchart showing a grouting reinforcement method according to the present invention.

First, as shown in FIG. 4, the construction of the plurality of drilling holes H is performed to reach a pre-designed tunnel inner part from the upper side of the tunnel to be constructed (S10).

At this time, the drilling hole (H) is a tunnel is formed in a plurality of rows along the width as well as the longitudinal direction when the drilling operation is progressed, in particular the GRP reinforcing member of the grouting reinforcement unit of the present invention protrudes into the tunnel to be constructed later The drilling operation is carried out to this extent possible.

Next, in the drilled hole H, the tunnel is located, that is, a portion of the tip portion of the drilled hole H is filled with a resin or a quick grouting material (S20).

Here, the resin or the fastening grouting material is made of a material that is hardened in a fast time, the filling depth is filled to a depth enough to insert a part of the GRP reinforcing member 20 of the grouting reinforcing unit 100 (S20).

Next, the step of inserting the grouting reinforcing unit 100 into the GRP reinforcing member 20 to the inside of the drilling hole (H) filled with the resin or the quick grouting material as described above (S30). .

At this time, the grouting reinforcing unit 100 is assembled in advance by using the compression connection module 110 a plurality of GRP reinforcing member 20 and the steel reinforcing member 10 according to the depth of the drilling hole, in particular in the tunnel While the GRP reinforcing member 20 is partially protruded, the steel reinforcing member 10 is assembled to a length such that the steel reinforcing member 10 partially protrudes from the ground.

Then, when the filled resin or the fastening grouting material is hardened, the front end portion of the grout reinforcing unit 100, that is, the GRP reinforcing member 20 is fixed to the inside of the drilling hole, is installed to partially protrude to the ground side. Pull the steel reinforcing member 10 to the outside to achieve a state in which the tensile force acts throughout the grouting reinforcement unit (100) (S40).

In this case, a tensile force acts on each of the coil springs 130 of the compression connection module 101 provided between the respective reinforcing members of the grouting reinforcing unit 100 so that the length of the whole grouting reinforcing unit is partially increased. Is achieved.

Next, the pressing band 150 is separated to perform the operation of keeping the outer case 111 fixed at a predetermined position inside the drilling hole H by using the fixing piece 112 ( S50).

Then, the perforated hole (H) is finally filled with a general grouting material, and performs the operation of fixing the steel reinforcing member 10 located at the outermost to the ground using a fixing cap or fixing bolts.

When the installation and grouting reinforcement work of the grouting reinforcement unit is completed through the above process, the grouting reinforcement unit 100 inside the drilling hole (H) is positioned with each spring 130 along its length direction. Compression force acts for each section.

In addition, when the grouting material is hardened around the grouting reinforcing unit 100, the ground also forms a state in which the compressive force acts up and down, and thus the upper and lower tunnels are constructed to maintain a stable structure. do.

Particularly, according to the present invention, the compressive force acts for each section based on the position where the compression connection module 110 is provided. In other words, even if some reinforcing members or compression connection module is rusted or damaged over time, the ground corresponding to the portion where the reinforcement member or compression connection module is located becomes weak, other compression force The section provided with the reinforcing member or the compression connection module is in operation to maintain a state in which the compressive force continues to act as a whole it is possible to maintain a more stable ground structure than before.

On the other hand, since the GRP reinforcing member 20, which is made of glass-reinforced synthetic fiber, is located at the site where the inner surface of the tunnel to be constructed is formed, the work when cutting and cutting to form the tunnel shape and the inner surface of the tunnel are performed. This is easier than in the case of the conventional steel reinforcement member.

That is, the GRP reinforcing member 20 has a strong compressive force and a tensile force in the vertical direction of the reinforcement is sufficiently made, while the shear force has a characteristic that is quite weak, because the shear force acts during the inner construction of the tunnel easily Although broken, after the tunnel is constructed, only the force in the vertical direction is mainly applied, so that the role of the reinforcing member can be sufficiently performed.

9 is a view showing another embodiment of the outer case constituting a kind of anchor module in the compression connection module.

As shown, the outer case 211 in the anchor module 201 in another embodiment of the present invention is a pair of fixing pieces 212 in a form that is fixed in both directions along the longitudinal direction of the drilling hole It may be provided.

That is, the outer case 211 having the fixing piece 212 configured as described above prevents the fixing piece 212 from being moved to the ground side of the upper portion along the longitudinal direction in the drilling hole H. Of course, it is also possible to more surely prevent the outer case is moved to the tunnel direction side located at the bottom.

On the other hand, the accompanying Figure 10 shows another embodiment of the compression connection module in the grouting reinforcement unit of the present invention.

That is, in one embodiment of the present invention described above, as shown in Figure 3, between the coupler 121 connected to one reinforcement member and the coupler 122 connected to the other reinforcement member coil spring 130 as an elastic member Although illustrated and described to be configured, in FIG. 10, the coil spring 130 is installed between the inner surface of the outer case 111 and the coupler 121.

In this case, after the reinforcing unit is installed in the drilling hole H, the grouting reinforcing work is performed after pulling the steel reinforcing member 10 on the upper side of the ground and fixing and grouting the work through the fixing piece 112. Upon completion, the reinforcing unit as a whole achieves a state in which the compression force acts.

In addition, the compression force acting for each section is also the same as the embodiment of the present invention. 10, only the coil spring 130 is provided between the coupler 121 and the outer case 111 positioned at the upper side of the outer case 111 in the compression connection module 210. Although the coil spring 130 is installed between the coupler 122 and the outer case 111 positioned at the lower side, the same effect is obtained, and the coil spring is formed between each of the couplers 121 and 122 and the outer case 111. Of course, even if it is installed.

Grouting reinforcing unit according to various embodiments of the present invention described above is applicable to the slope as shown in Figure 11 attached.

In this case, the GRP reinforcing member is not used, and it may be desirable that the entire reinforcing unit is made of all steel reinforcing members.

Furthermore, the present invention is also applicable to the grouting reinforcement method according to another embodiment as shown in Figure 12 to 15 attached.

Hereinafter, the grouting reinforcement method according to another embodiment of the present invention in more detail as follows.

12 to 15 are a view showing a grouting reinforcement method applying the grouting reinforcement unit from the inside of the tunnel.

First, as shown in FIG. 12, a garnet is constructed.

Here, the said tunnel refers to constructing a tunnel of about two lanes in advance and the like, for example, when constructing a tunnel consisting entirely of four lanes of reciprocation.

In other words, the term "garnet tunnel" means to construct only a tunnel having a partial inner diameter before the construction of the entire completed tunnel, and refers to a kind of pilot tunnel for transporting equipment and the like.

As described above, after the construction of the tunnel, as shown in the accompanying FIG. 13, the drilling hole (H) is drilled and the grouting reinforcing unit 100 is inserted into the drilling hole (H).

At this time, the grouting reinforcing unit 100 is inserted and installed so that the GRP reinforcing portion 20 is located toward the tunnel inner surface 7.

Furthermore, if the portion indicated by the dashed line in FIG. 14 corresponds to the inner surface 8 of the tunnel to be finally excavated, the GRP reinforcing member 8 between the inner surface 7 of the tunnel and the inner surface 8 of the tunnel to be finally excavated. To be located.

Here, in the case of installing the reinforcing unit 100 for grouting, as shown in the above-described embodiment, the grouting reinforcing unit 100 is inserted and fixed after filling the quenching grouting material, etc. in advance in the drilling hole. Can be.

Then, after pulling out the GRP reinforcing member 20 protruding into the tunnel and applying a tensile force, the grouting material is inserted, and the grouting reinforcement unit 100 uses the anchor module 100 at predetermined positions in the drilling hole H. ) To be fixed.

When the work for fixing the grouting reinforcing unit in the drilling hole is completed through the process as described above, the work is carried out to the extent enough to correspond to the tunnel to be completed.

That is, the excavation work is performed up to the vicinity of the dotted line 8 shown in FIG.

The tunnel showing the excavation is completed as shown in FIG.

That is, even when the reinforcing operation is performed using the grouting reinforcing unit from the inside of the tunnel as described above, when cutting the inner surface of the tunnel a little more or finishing finishing, etc., the GRP reinforcing unit 20 of the glass fiber material is formed inside the tunnel. Since it is provided, the work becomes easy and the damage of the equipment is prevented as in the above-described embodiment.

And, such a grouting reinforcement method is also shown in FIG. 10, of course, can be applied to the grouting reinforcement unit used compression connection module 210 according to another embodiment of the present invention.

As described above, the preferred embodiments of the present invention have been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof has ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

For example, the anchor module is illustrated and described by way of example in order to facilitate understanding and explanation, but other anchor modules of the same principle that produce the same effect as the present invention may be used.

1 is a cross-sectional view schematically showing a tunnel in which the grouting reinforcement method according to the prior art is implemented;

Figure 2 is an enlarged view for explaining how the grouting reinforcement method according to the prior art is implemented;

3 is a view showing a grouting reinforcing unit according to an embodiment of the present invention;

Figure 4 is a schematic cross-sectional view showing a drilled hole in the upper ground for the construction of the tunnel;

5 to 7 are views showing a sequence in which a grouting reinforcement method is performed using a grouting reinforcing unit according to an embodiment of the present invention;

8 is a flow chart showing a grouting reinforcement method according to the invention;

9 is a view schematically showing another embodiment of an anchor module in the present invention;

10 is a cross-sectional view showing a grouting reinforcing unit according to another embodiment of the present invention;

11 is a view showing a state in which the present invention grouting reinforcement unit is applied to the topography of the slope structure; And

12 to 15 are cross-sectional views showing a tunnel structure to which the grouting reinforcement unit is applied according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10,20: reinforcing member 100: grouting reinforcing unit

101: anchor module 110: compression connection module

111: outer case 112: fixing piece

115: spring 121,122: coupler

130: coil spring 150: pressure band

Claims (12)

In the reinforcing unit for grouting work using the drilled hole formed in the ground, At least two reinforcing members inserted into the drilling holes; And A compression connection module positioned between each of the reinforcing members and connected to the compressive force between the reinforcing members after the grouting operation is completed; Grouting reinforcement unit comprising a. The method of claim 1, Grouting reinforcement unit characterized in that it further comprises a GRP (Glass Reinforced Plastic) reinforcing member connected to be inserted into the drilling hole best. The method of claim 1, The compression connection module, An outer case to which one end of the reinforcing member is slidably moved along the length direction to both sides with respect to the longitudinal direction of the reinforcing member; A coupler coupled to one end of the reinforcing member and slidably movable together with the reinforcing member inside the outer case; And An elastic member provided inside the outer case to apply a restoring force to return the reinforcing member to its original position when the reinforcing member is pulled outward in the longitudinal direction; Grouting reinforcement unit, characterized in that comprises a. The method of claim 3, The elastic member is formed of a coil spring, Grouting reinforcement unit, characterized in that provided between the pair of couplers and at the same time one side and the other side of the coil spring is fixed to the coupler. The method of claim 3, The elastic member is formed of a coil spring, Grouting reinforcement unit, characterized in that provided between the coupler and the outer case. The method of claim 3, The outer case, Grouting reinforcement unit, characterized in that it further comprises a fixing piece to the outside of the outer case to be fixed to the inside of the drilling hole. The method of claim 6, The fixing piece, Rotatably hinged to the outer case, Grouting reinforcing unit between the fixing piece and the outer case further comprises an elastic portion for rotating the fixing piece to abut on the inner side of the hole when the external force is not applied to the fixing piece. The method of claim 2, GRP (Glass Reinforced Plastic) reinforcing member and the steel reinforcing member that is best inserted into the drilling hole is connected by the compression connecting unit. In the grouting method performed using the grouting reinforcing unit according to any one of claims 1 to 8, Drilling a hole in the ground; Filling a fastening grouting material into the drilling hole; Inserting the grouting reinforcing unit into the drilling hole filled with the quick grouting material; Inserting a grouting material into the drilling hole into which the grouting reinforcing unit is inserted; And Pulling and fixing the reinforcing unit positioned outside the ground in the grouting reinforcing unit inserted into the drilling hole; Grouting reinforcement method comprising a. 10. The method of claim 9, Grouting reinforcement method characterized in that it further comprises the step of fixing to the inside of the drilling hole using the fixing piece. In the grouting method performed using the grouting reinforcing unit according to any one of claims 1 to 8, Burrowing the tunnel; Drilling a drilling hole from an inner side of the visible tunnel to a ground side; Inserting a grout reinforcing unit having a GRP reinforcing member connected to a plurality of steel reinforcing members at one end of the perforation hole, and a plurality of steel reinforcing members connected to the GRP reinforcing member toward the inside of the tunnel; Inserting a grouting material into the drilling hole into which the grouting reinforcing unit is inserted; And Pulling and fixing the GRP reinforcing member located inside the tunnel in the grouting reinforcing unit inserted into the drilling hole; Grouting reinforcement method comprising a. The method of claim 11, Grouting reinforcement method characterized in that it further comprises the step of fixing to the inside of the drilling hole using the fixing piece.

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