KR100914962B1 - Multi-stage type appratus for injecting reinforcement and method for injecting reinforcement - Google Patents

Abstract

A multi-stage reinforcement injection device and method are provided to use reinforcing bars as tensile member and to fill reinforcement in each section of an excavated hole in multiple stages. A multi-stage reinforcement injection device comprises a reinforcing bar(100) inserted in an excavated hole(1), two or more reinforcement injection pipes(200) with discharge holes(210) which are located at different depths when inserted in the excavated hole, a plate(500) which is combined in the reinforcing bar in order to cover the entrance of the excavated hole, and an airtight pack(600) which is located between the excavated hole entrance and the plate and expanded by an expansion material like mortar to close the interval between the excavated hole entrance and the plate.

Description

Multi-stage type appratus for injecting reinforcement and method for injecting reinforcement}

The present invention relates to a multi-stage reinforcing material injection device and a multi-stage reinforcing material injection method, and more particularly to a device and a method for injecting the reinforcing material in the multi-stage in the excavation hole while inserting the reinforcing bars in the excavation hole.

In general, in order to improve or reinforce the ground of tunnel excavation surface, soft paper, or incision, the reinforcing material injection device and the reinforcing material injection method using the reinforcing material which injects the reinforcing material such as reinforcing material into the perforated space or the rock are used. do.

The reinforcement injection method is a method for drilling the reinforcement pipe by inserting the reinforcement pipe at a predetermined interval along the circumferential surface of the tunnel and injecting the reinforcement into the reinforcement pipe so that the ground is reinforced as the reinforcement is ejected to the outside of the reinforcement pipe and solidified. A reinforcing material injector having a separate injection pipe for injecting a reinforcing material into the reinforcing pipe is used.

Hereinafter, a conventional reinforcing material injector and a reinforcing material injection method will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view of a conventional reinforcing material injection device.

As shown in FIG. 1, a conventional reinforcing material injection device includes a reinforcing pipe 10 inserted into an excavation hole 1 formed in a tunnel or ground by a perforator or excavator, and a reinforcing material inside the reinforcing pipe 10. It is configured to include a reinforcing material injection tube 20 for injection.

The reinforcement pipe 10 has an end thereof closed and the inside is made of an empty cylindrical shape, and a plurality of discharge holes at regular intervals on the outer circumference thereof are discharged to the outside as the reinforcement is injected and pressurized through the inside thereof ( 11) is formed.

On the other hand, between the inlet of the excavation hole (1) and the outer periphery of the reinforcing pipe 10 is provided with a ring-shaped packing (2), the packing (2) is a reinforcing material extruded into the excavation hole (1) It is provided to prevent the outflow of the excavation hole (1).

The reinforcing material injection pipe 20 is connected to the injector for supplying the reinforcing material provided from the stirrer into the reinforcing pipe 10 to supply the reinforcing material into the reinforcing pipe 10.

At this time, a single packer 21 is installed between the reinforcing pipe 10 and the reinforcing material injection pipe 20 so that the reinforcing material supplied into the reinforcing pipe 10 through the reinforcing material injection pipe 20 is the reinforcing pipe ( To prevent back discharge to the inlet of

When the reinforcing material is filled in the reinforcing pipe 10 as described above, the internal pressure increases, and the reinforcing material inside the reinforcing pipe 10 is discharged toward the digging hole 1 to fill the digging hole 1. As the external discharge of the reinforcement is made continuously as described above, the grouting construction is completed.

 However, the conventional reinforcement injection device is configured as described above, when the excavation hole (1) is formed very deep, the reinforcement injection through the reinforcement injection pipe 20 has to be made for a long time, there is a disadvantage that the construction time takes a lot. In addition, when the reinforcing material is applied as a rapid curing material to shorten the construction time, since the reinforcing material is hardened before the injection of the reinforcing material is completed, the inside of the excavation hole (1) is not completely filled. There is this.

In order to solve such a problem, after dividing the inside of the excavation hole into two or more sections, a multi-stage reinforcement injection device having a reinforcement injection pipe for injecting reinforcement for each section has been proposed.

Figure 2 is a side cross-sectional view of a second embodiment of a conventional multistage reinforcing material injection device.

As shown in FIG. 2, the conventional multi-stage reinforcing material injection device includes a plurality of packers 21 in pairs in one reinforcing pipe 10 to form a plurality of internal spaces 12 in the reinforcing pipe 10. A plurality of reinforcing material injection tubes 20 are provided for injecting reinforcing materials into the respective inner spaces 12. In addition, an inflatable expansion sheet 30 is installed on the outer surface of the reinforcing pipe 10 corresponding to each of the inner spaces 12, and the expansion sheet 30 inside the inflatable sheet 30 may be expanded. Expansion material injection tube 40 for injecting the expansion material is provided.

By injecting the expansion material into the expansion sheet 30 through the expansion material injection pipe 40, the worker distinguishes the interior space 12 of each of the reinforcing pipes 10 from the corresponding excavation hole 1, respectively. Through the reinforcing material injection pipe 20 of the corresponding reinforcing pipe 10 can be filled with the reinforcing material and the inside of the excavation hole (1).

That is, by using the conventional multi-stage reinforcement injector shown in Figure 2, by filling the inner space 12 of the reinforcement pipe 10 with the reinforcement for each section, the reinforcement injection time can be shortened, thereby reinforcing the reinforcement material It can be used as an advantage.

There is a method of using a pipe as a tension member as shown in Figs. 1 and 2 in the earth screening method for preventing the collapse of the sloped ground or tunnel walls, but the pipe is relatively expensive and has a disadvantage of low tensile strength to weight Bar, there is also a method of using a reinforcing member with a reinforcing bar with a high tensile strength to weight while low unit price.

However, the conventional multi-stage reinforcement injection device is configured as described above, the space for the reinforcement is primarily filled so that the reinforcement injected through each reinforcement injection pipe 20 can be evenly filled into each portion of the excavation hole (1). That is, since the inner space 12 of the reinforcing pipe 10 is essentially required, there is a problem that it cannot be used in the earthquake method using reinforcing bars as tension members instead of the reinforcing pipe 10.

The present invention has been proposed in order to solve the above problems, to provide a multi-stage reinforcing material injection device and a multi-stage reinforcing material injection method configured to fill each section of the excavation hole with reinforcement in multiple stages while being able to use the reinforcement as a tension member. There is a purpose.

Multi-stage reinforcing material injection device according to the present invention for achieving the above object,

Rebar introduced into the excavation hole;

Two or more reinforcing material inlet pipe end is sealed and the discharge hole is formed on the outer circumferential surface, the discharge hole is located in the inner space of the drilling hole of different depth when the discharge hole is introduced into the drilling hole;

It is configured to include.

It further includes an opening and closing member mounted to the reinforcing material inlet pipe to open and close the discharge hole.

The opening and closing member is surrounded by an outer circumferential surface of the reinforcing material injection tube so as to cover the discharge hole, it is composed of a structure having an elastic material or elasticity in a direction in close contact with the outer circumferential surface of the injection tube.

The discharge holes are provided in pairs so as to face each other based on the central axis of the reinforcing material injection pipe.

The reinforcing bar and the reinforcing material injection tube is further penetrated, and further includes a packer for sealing the inlet side of the excavation hole when it is injected into the expansion material.

A plate coupled to the reinforcing bar to cover the inlet of the excavation hole;

A sealing pack positioned between the inlet of the excavation hole and the plate and expandable to seal between the inlet of the excavation hole and the plate when an expansion material is injected into the excavation hole;

It includes more.

Multi-stage reinforcing material injection method according to the present invention,

Inserting the reinforcing bars, two or more reinforcing material injection pipes having end caps closed and discharge holes formed on outer circumferential surfaces, and the discharge holes formed at different positions, and a packer into the excavation hole;

Closing the inlet side of the excavation hole by inflating the packer by injecting an expansion material into the packer;

Injecting a reinforcing material into the reinforcing material injection pipe so that the reinforcing material is ejected through the discharge hole and filled in the excavation hole;

It includes.

Before the step of injecting the reinforcing material into the reinforcing material injection pipe,

Mount the plate to the reinforcing bar to cover the inlet of the discharge hole, insert a sealed pack between the plate and the inlet of the discharge hole, inject the expansion material into the sealed pack to expand the sealed pack to the excavation Sealing between the inlet of the ball and the plate;

It further includes.

The reinforcing material injection tube is formed of a material having elasticity or elasticity in the direction in close contact with the outer peripheral surface of the reinforcing material injection tube to cover the discharge hole, before being inserted into the excavation hole The opening and closing member is mounted.

Injecting the reinforcing material into the reinforcing material injection tube,

The reinforcement is configured to be injected into all the reinforcement injection pipes at the same time, or the reinforcement is sequentially injected into each reinforcement injection pipe.

By using the multi-stage reinforcing material injection device and the multi-stage reinforcing material injection method according to the present invention, while rebar can be used as the tension member, each section of the excavation hole can be filled with the reinforcement in multiple stages, and the reinforcing material flows back through the reinforcing material injection pipe. It can be prevented, and the inlet of the excavation hole can be more easily and effectively sealed.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a multi-stage reinforcing material injection device and a multi-stage reinforcing material injection method according to the present invention.

3 is a cross-sectional view of the multi-stage reinforcing material injection apparatus according to the present invention.

Multi-stage reinforcing material injection device according to the present invention using a reinforcing bar 100, but not using a tensile member receiving a tensile force as a conventional reinforcing material injection device shown in Figure 1 and 2, but each section of the excavation hole (1) It is characterized in that it is configured to inject a reinforcement.

That is, the multi-stage reinforcing material injection device according to the present invention, the reinforcing bar 100 is introduced into the excavation hole (1), two or more reinforcing material injection pipe 200 is introduced into the excavation hole (1), and the discharge hole It is configured to include an opening and closing member 230 mounted to the reinforcing material injection pipe 200 to open and close the 210.

The reinforcement injection pipes 200 are each manufactured to have a different length, the discharge hole 210 formed in each reinforcement injection pipe 200 when the reinforcement injection pipe 200 is introduced into the excavation hole (1) ) Are located in the inner space of the excavation hole (1) of different depths. Therefore, by injecting the reinforcing material into any one of the reinforcing material injection pipe 200 of the reinforcing material injection pipe 200, the reinforcing material may be filled only in any portion of the excavation hole (1), the reinforcing material in all the reinforcing material injection pipe 200 By injection, the inside of the excavation hole 1 can be quickly filled with reinforcement.

At this time, when the reinforcing material injection pipe 200 is formed in a simple tube or pipe shape is configured to be discharged through the end of the reinforcing material introduced into the inside, the reinforcing material discharged from the reinforcing material injection pipe 200 is excavated by the discharge pressure ( Only concentrated inwardly of 1) bar, there is a disadvantage that the inside of the excavation hole (1) can not be evenly filled with a reinforcing material. Of course, when the reinforcing material discharged from the reinforcing material injection tube 20 as shown in the embodiment shown in Figure 1 and 2 primarily fill the inside of the reinforcing pipe 10, and then filling the inside of the excavation hole (1), Even though the reinforcing material is discharged through the end of the reinforcing material injection pipe 20, it is evenly filled to each part of the excavation hole (1). However, when the tension member is used as the reinforcing bar 100 as in the multistage reinforcing material injection device according to the present invention, there is no separate space in which the reinforcing material discharged through the reinforcing material injection pipe 200 is primarily filled, so that even filling of the reinforcing material is performed. There is a problem that is difficult.

In order to solve this problem, the multi-stage reinforcing material injection device according to the present invention, the end of the reinforcing material injection pipe 200 is sealed with a sealing member 220 and a plurality of discharge holes 210 are formed on the outer peripheral surface near the closed end There is a characteristic in point. When the reinforcing material injection tube 200 is formed as described above, the reinforcing material introduced into the reinforcing material injection pipe 200 is discharged in a direction perpendicular to the longitudinal direction of the reinforcing material injection pipe 200 through the discharge hole 210, There is an advantage that the inside of the excavation hole (1) is evenly filled with a reinforcing material.

Discharge holes 210 formed in each of the reinforcing material injection pipe 200, the reinforcing material injection pipe 200 is disposed so as not to overlap each other when inserted into the excavation hole (1), the whole of the excavation hole (1) It can be evenly filled with stiffeners.

At this time, when the reinforcing material injection pipe 200 is inserted into the excavation hole (1) in the state in which the discharge hole 210 is opened, the discharge hole 210 is clogged with soil or foreign matter to facilitate the ejection of the reinforcing material There is a risk of not supporting.

Therefore, the multi-stage reinforcement injection device according to the present invention, while the reinforcement injection pipe 200 is inserted into the excavation hole (1) to close the discharge hole 210, the reinforcement is injected into the reinforcement injection pipe 200 When it is further comprises an opening and closing member 230 is configured to open the discharge hole 210. The opening and closing member 230 is surrounded by an outer circumferential surface of the reinforcing material injection tube 200 to cover the discharge hole 210, and is composed of a material having elasticity or a structure having elasticity in a direction in close contact with the outer circumferential surface of the injection tube do. Therefore, when the reinforcing material is injected into the reinforcing material injection pipe 200 to increase the pressure inside the reinforcing material injection pipe 200, the opening and closing member 230 is extended to be spaced apart from the outer circumferential surface of the injection pipe 210. Open the reinforcement, the reinforcing material in the reinforcing material injection pipe 200 is discharged to the outside of the reinforcing material injection pipe 200.

At this time, the opening and closing member 230 in the present embodiment has been described in the case of being configured as a rubber band structure to reduce the manufacturing cost and ease of assembly, the opening and closing member 230 is inside the reinforcing material injection pipe 200 If the structure to allow the fluid flow only from the outside can be replaced with various check valves and the like.

In addition, the multi-stage reinforcing material injection device according to the present invention, the packer for sealing the inlet side of the excavation hole (1) so that the reinforcement discharged into the excavation hole (1) does not flow out through the inlet of the excavation hole (1) 300 may be further provided.

The packer 300, the reinforcing bar 100 and the reinforcing material injection pipe 200 is penetrated, and when expanded to be injected into the expansion material to the outside surface is in close contact with the inner peripheral surface of the excavation hole 1, the excavation It is configured to seal the inlet side of the ball (1). As such, the packer 300 for sealing the inlet of the excavation hole 1 is already commercialized, and a detailed description thereof will be omitted.

In addition, the multi-stage reinforcement injection device according to the present invention, the reinforcement injection pipe 200 is further provided with a spacer 400 for fixing the position of the reinforcement injection pipe 200 so as not to be biased or bent to any one side. do.

The spacer 400 is mounted to surround the reinforcing bar 100, and a through hole 410 is formed to penetrate each of the reinforcing material injection tubes 200. When the spacer 400 configured as described above is further provided, when the reinforcement injection pipe 200 is inserted into the excavation hole 1 or when the reinforcement is injected into the reinforcement injection pipe 200, the reinforcement injection pipe ( Since the position of the 200 is fixed constantly, there is an advantage that the insertion of the reinforcement injection pipe 200 and the reinforcement injection can be made more stably.

Hereinafter, a usage example of the multistage reinforcing material injection device according to the present invention will be described with reference to FIGS. 4 to 7.

4 is a cross-sectional view of the multi-stage reinforcement injection device according to the present invention in which the packer 300 is expanded, Figures 5 and 6 shows the operation of the opening and closing member 230 when the reinforcement injection into the reinforcement injection pipe 200. 7 is a cross-sectional view of the multistage reinforcing material injector according to the present invention in which the excavation hole 1 is filled with a reinforcing material.

When the reinforcing material is to be injected into the excavation hole 1 by using the multi-stage reinforcing material injection device according to the present invention, first the reinforcing bars 100 and the reinforcing material injection pipe 200 and the packer 300 excavation hole (1) After inserting into the inside, the expansion material is injected into the packer 300 through the expansion material injection tube 310 as shown in FIG. 4 to expand the packer 300, the excavation hole (1) Seal the inlet side.

When the inlet-side sealing of the excavation hole 1 is completed, the reinforcing material is injected into the reinforcing material injection tube 200 so that the reinforcing material is ejected through the discharge hole 210 to be filled in the digging hole 1. At this time, before the reinforcement injection pipe 200 is inserted into the excavation hole (1) on the outer circumferential surface of the reinforcement injection pipe 200 to cover the discharge hole 210 as shown in Figure 5 230 is mounted, the opening and closing member 230 is a portion covering the discharge hole 210 is pushed outwards as shown in Figure 6 as the reinforcement injection pressure inside the reinforcement injection pipe 200 is increased The reinforcing material in the reinforcing material injection pipe 200 is to be discharged to the outside of the reinforcing material injection pipe 200 through the discharge hole 210.

When the plurality of discharge holes 210 are formed along the outer circumferential surface of the injection pipe, the entire inner surface of the opening and closing member 230 is spaced apart from the outer surface of the stiffener injection pipe 200 to open and close the opening member 230. When the mounting position of the opening and closing member 230 is changed in this way, the opening and closing member 230 is the discharge hole 210 when the reinforcement injection into the reinforcement injection pipe 200 is stopped. There is a problem that can not be prevented correctly.

In order to solve this problem, the discharge hole 210 is preferably provided in pairs to face each other based on the central axis of the reinforcing material injection pipe 200. When the pair of discharge holes 210 are provided in the opposite directions as described above, when the reinforcing material is discharged through the discharge holes 210, the discharge holes (the inner side of the opening / closing member 230) are illustrated in FIG. 6. A portion corresponding to 210, that is, the upper side and the lower side is spaced apart from the outer surface of the stiffener injection tube 200, but the left and right sides are in close contact with the stiffener injection tube 200, changing the mounting position of the opening and closing member 230 This will not occur.

In addition, when the reinforcing material is injected into the reinforcing material injection pipe 200, the reinforcing material may be injected into all the reinforcing material injection pipe 200 at the same time, each reinforcing material injection pipe 200 may be injected sequentially. That is, when the reinforcement injection should be performed independently according to the ground characteristics of the excavation hole 1 by section, reinforcement may be injected only into the selected reinforcement injection pipe 200, or the ground characteristics of the excavation hole 1 by section Regardless of whether a fast reinforcement injection is required, the reinforcement filling rate into the excavation hole 1 may be increased by simultaneously injecting the reinforcement into all the reinforcement injection pipes 200.

As described above, when the multi-stage reinforcing material injector and the multi-stage reinforcing material injection method are used, the amount of reinforcing material reinforcement can be adjusted according to the characteristics of each ground, and even the earthquake method using the tension member as the reinforcement 100 reinforces the fastening material. The advantage is that it can be used as.

8 is a cross-sectional view of a second embodiment of the multi-stage reinforcing material injection device according to the present invention.

Before the step of injecting the reinforcing material into the reinforcing material injection pipe 200, the plate 500 may be mounted to the reinforcing bar 100 by a nut 510 to cover the inlet of the discharge hole 210, Conventionally, mortar has been used to fill the separation space between the plate 500 and the discharge hole 210.

However, since mortar has a property of fluidity before curing is completed, the mortar filled between the plate 500 and the discharge hole 210 flows down, and thus the separation between the plate 500 and the discharge hole 210 is performed. Filling the space takes a large amount of mortar, the construction takes a lot of disadvantages.

In order to solve this disadvantage, the sealing pack 600 may be additionally provided between the plate 500 and the inlet of the excavation hole (1). The sealed pack 600 expands when mortar is injected into the sealed pack 600 to seal between the inlet of the excavation hole 1 and the plate 500.

Since the mortar injected into the sealed pack 600 does not have to flow down, when the sealed pack 600 is additionally provided as described above, the operator may more easily enter the plate 500 and the excavation hole 1. There is an advantage that can be sealed.

In this case, the material injected into the sealed pack 600 may be replaced with any expansion material as long as it is a material capable of expanding the sealed pack 600 when injected into the sealed pack 600 in addition to the mortar.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment, Comprising: It should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

1 is a side cross-sectional view of a conventional reinforcing material injection device.

Figure 2 is a side cross-sectional view of a second embodiment of a conventional multistage reinforcing material injection device.

3 is a cross-sectional view of the multi-stage reinforcing material injection apparatus according to the present invention.

Figure 4 is a cross-sectional view of the multi-stage reinforcing material injection device according to the invention the packer is expanded.

5 and 6 are cross-sectional views showing the operation of the opening and closing member when the reinforcing material is injected into the reinforcing material injection pipe.

7 is a cross-sectional view of the multi-stage reinforcing material injection device according to the present invention filled in the excavation hole inside the reinforcing material.

8 is a cross-sectional view of a second embodiment of the multi-stage reinforcing material injection device according to the present invention.

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

1: excavation hole 100: rebar

200: reinforcing material injection pipe 210: discharge hole

220: sealing member 230: opening and closing member

300: packer 310: expansion material injection tube

400: spacer 410: through hole

500: plate 510: nut

600: Airtight Pack

Claims (10)

Reinforcing bar 100 is introduced into the excavation hole (1); The end is sealed and the discharge hole 210 is formed on the outer circumferential surface, when the discharge hole 210 is introduced into the excavation hole (1) two or more reinforcing materials located in the internal space of the excavation hole (1) of different depths Injection tube 200; A plate 500 coupled to the reinforcing bar 100 to cover the inlet of the excavation hole 1; Located between the inlet of the excavation hole (1) and the plate 500, the expandable sealing pack to seal between the inlet of the excavation hole (1) and the plate 500 when the expansion material is injected into the inside 600; Multi-stage reinforcement injector, characterized in that configured to include. The method of claim 1, Multi-stage reinforcement injection device, characterized in that it further comprises an opening and closing member 230 mounted to the reinforcement injection pipe 200 to open and close the discharge hole (210). The method of claim 2, The opening and closing member 230 surrounds the outer circumferential surface of the reinforcement injection tube 200 so as to cover the discharge hole 210, and has a material or elasticity in elastic direction in close contact with the outer circumferential surface of the reinforcement injection tube 200. Multi-stage reinforcement injector, characterized in that consisting of a structure having. The method of claim 3, The discharge hole 210 is a multi-stage reinforcement injection device, characterized in that provided in pairs to face each other based on the central axis of the reinforcement injection pipe 200. The method according to any one of claims 1 to 4, The reinforcement 100 and the reinforcing material injection pipe 200 is penetrated, multi-stage characterized in that it further comprises a packer 300 for sealing the inlet side of the excavation hole (1) when injected into the expansion material to expand Stiffener injection device. delete delete Reinforcement 100, the end is closed and the discharge hole 210 is formed on the outer circumferential surface and two or more reinforcement injection pipe 200 and the packer 300 excavation hole is formed in the discharge hole 210 in different positions (1) inserting it into the interior; Sealing the inlet side of the excavation hole (1) by inflating the packer (300) by injecting an expansion material into the packer (300); After mounting the plate 500 to the reinforcement 100 to cover the inlet of the discharge hole 210, and inserting the sealing pack 600 between the plate 500 and the inlet of the discharge hole 210, Sealing the gap between the inlet of the excavation hole (1) and the plate (500) by expanding the sealing pack (600) by injecting an expansion material into the sealing pack (600); Injecting a reinforcing material into the reinforcing material injection pipe (200) such that a reinforcing material is ejected through the discharge hole (210) to be filled in the excavation hole (1); Multi-stage reinforcement injection method comprising a. Reinforcement 100, the end is closed and the discharge hole 210 is formed on the outer circumferential surface and two or more reinforcement injection pipe 200 and the packer 300 excavation hole is formed in the discharge hole 210 in different positions (1) inserting it into the interior; Sealing the inlet side of the excavation hole (1) by inflating the packer (300) by injecting an expansion material into the packer (300); Injecting a reinforcing material into the reinforcing material injection pipe (200) such that the reinforcing material is ejected through the discharge hole (210) to be filled in the excavation hole (1); Including; The reinforcement injection pipe 200 is surrounded by the outer circumferential surface of the reinforcement injection pipe 200 to cover the discharge hole 210 before being inserted into the excavation hole (1) in close contact with the outer circumferential surface of the injection pipe Multi-stage reinforcement injection method is mounted to the opening and closing member 230 made of a material having an elastic or elastic structure. Reinforcement 100, the end is closed and the discharge hole 210 is formed on the outer circumferential surface and two or more reinforcement injection pipe 200 and the packer 300 excavation hole is formed in the discharge hole 210 in different positions (1) inserting it into the interior; Sealing the inlet side of the excavation hole (1) by inflating the packer (300) by injecting an expansion material into the packer (300); Injecting a reinforcing material into the reinforcing material injection pipe (200) such that the reinforcing material is ejected through the discharge hole (210) to be filled in the excavation hole (1); Including; Injecting the reinforcing material into the reinforcing material injection pipe 200, All reinforcement injection pipe 200 is configured to be injected into the reinforcement at the same time, or multi-stage reinforcement injection method is configured to be sequentially injected into each reinforcement injection pipe (200).

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