KR20230135968A - High-strength cross-section restoration device for eco-friendly filler injection and cross-section restoration method using the same - Google Patents

Abstract

The present invention not only shortens the process time for the pretreatment step of the cross-sectional restoration method for cracks in concrete, but also reduces the cost required for pretreatment, and improves the completeness of cutting for injecting eco-friendly filler regardless of the worker's skill level. It relates to a high-strength cross-sectional recovery device for injection of eco-friendly filler that can reduce fatigue. More specifically, it includes a moving member that moves along a crack formed in the ground, and a 'V' installed on the moving member to open the crack for injection of eco-friendly filler. Cutting in a 'letter' or 'U' shape, a driving member removes foreign substances present in or around the crack before cutting the crack, and the crack on which cutting is performed by the driving member is filmed, and the captured image information is displayed for cutting. It is characterized by including a control member that checks the accuracy of.

Description

High-strength cross-section restoration device for eco-friendly filler injection and cross-section restoration method using the same}

The present invention not only shortens the process time for the pretreatment step of the cross-sectional restoration method for cracks in concrete, but also reduces the cost required for pretreatment, and improves the completeness of cutting for injecting eco-friendly filler regardless of the worker's skill level. This relates to a high-strength cross-sectional recovery device for injection of eco-friendly filler that can reduce fatigue.

In general, cracks occur in concrete structures due to various causes such as poor construction, temperature shrinkage, drying shrinkage, bleeding, acid erosion, freeze-thaw, and impact load, as well as during various activation processes. Due to the material characteristics of concrete, cracks in concrete structures occur. ) is inevitable.

The occurrence of cracks in such concrete structures not only reduces the durability of the structure, but also causes water leakage within the member, which destroys the passive film and causes corrosion and expansion of the reinforcing bars depending on how the structure is constructed.

Furthermore, since secondary cracks or crack width expansion occur due to this, which reduces the usability of the structure, the reality is that rapid cross-sectional recovery measures are needed.

For the above-mentioned cross-sectional recovery structure, the 'cross-sectional recovery method of concrete structures', which is domestically registered patent No. 10-1646235 (announcement date: 2016.08.08.), has been disclosed as a prior art. To briefly summarize the prior art, A pre-treatment step of pre-treating the damaged concrete cross-section, a new and old adhesive application step of applying a new and old adhesive to the concrete cross-section, a first cross-section restoration material application step of filling the concrete cross-section with a cross-section restoration material, and a cross-section restoration material to the concrete cross-section. It consists of a method that includes the step of applying a second cross-section restoration material to fill the surface. Through this method, it has excellent corrosion resistance and is environmentally friendly, has excellent cross-section restoration and surface strengthening performance, is excellent in workability, and is the optimal base conditioner. By additionally applying coating finishing materials, it is possible to realize the advantage of significantly improving the durability of concrete structures.

Here, the pretreatment step in the above-described prior art means that the worker uses a grinder to remove rust from the exposed rebar on the concrete cross-section and then applies a rust preventive or cuts the cracks formed on the concrete surface with a grinder. The grinder used in this step refers to a small grinder that can be carried by the operator, which causes problems in that the time and labor costs required for the pre-processing step are relatively high.

In particular, in the case of cracks, the operator sits in the longitudinal direction of the crack and performs the cutting work, which causes greater variation in cutting completeness depending on skill level, increases fatigue, and reduces work efficiency.

Domestic registered patent No. 10-1646235 (announcement date: 2016.08.08.) Domestic registered patent No. 10-1253598 (announcement date: 201.04.11.) Domestic Published Patent No. 10-2002-55567 (Published Date: 2002.07.09.) Domestic registered patent No. 10-0412783 (December 31, 2003)

In order to solve the above-described conventional problems, the present invention not only shortens the process time for the pretreatment step of the cross-sectional restoration method for cracks in concrete used in buildings, etc., but also reduces the cost required for pretreatment, regardless of the worker's skill level. The purpose is to provide a high-strength cross-section recovery device that can reduce fatigue while improving the completeness of cutting for injecting eco-friendly fillers.

In order to solve the above-mentioned technical problem, the high-strength cross-sectional recovery device for injection of eco-friendly filler according to the present invention includes a moving member 100 that moves along a crack (C) formed in the ground (G), and the moving member (100). When installed, the crack (C) is cut into a 'V' or 'U' shape for injection of eco-friendly filler, and a driving member (200) is used to remove foreign substances present in or around the crack (C) before cutting the crack (C). ) and a control member 300 that photographs the crack C where cutting is performed by the driving member 200 and displays the captured image information to check whether the cutting is accurate.

In addition, the moving member 100 is formed to have a predetermined height, and includes a moving body 110 provided at the lower part with wheels 113 that move or are fixed along the ground G, and an upper part of the moving body 110. A holder 120 on which the control member 300 on which image information is displayed is detachably mounted, and a control member 300 and a crack C formed on the outer surface of the moving object 110 to photograph the crack C. The auxiliary bracket 130, which is equipped with the driving member 200 that sprays air supplied from the outside in this direction, protrudes in front of the moving body 110 and removes foreign substances present in the crack C before cutting by rotating it. It is preferable that the driving member 200 to be removed includes a roller fixing piece 140 on which it is installed.

In addition, the driving member 200 includes a driving motor 210 installed on the auxiliary bracket 130 to rotate under the control of the control panel 310, and the moving body 110 to rotate by the driving motor 210. ) and a blade 220 that cuts the crack C by rotation, and is rotatably installed on the roller fixing piece 140 to rotate by the drive motor 210, so that it is present in the crack C. It includes a brush roller 230 that removes foreign substances by rotation and an air nozzle 240 installed on the auxiliary bracket 130 that sprays air supplied from the outside in the direction of the crack C, and cracks (240) for cutting. The insertion depth (D) of the lower end of the blade 220 inserted into C) is preferably 0.2 mm to 0.5 mm.

In addition, the control member 300 is detachably mounted with a control panel 310 that controls the driving member 200 and the holder 120 so that image information transmitted to the control panel 310 can be displayed. It is preferable to include a camera 330 installed on the mobile terminal 320 and the auxiliary bracket 130 to capture image information to be transmitted to the control panel 310.

According to the present invention, unlike the conventional method, the pretreatment process time for cracks in concrete is shortened, the cost required for pretreatment is reduced, and the completeness of the cutting part for injecting eco-friendly filler is improved regardless of the worker's skill level. At the same time, it has the effect of reducing fatigue.

Figure 1 is a side view showing a high-strength cross-sectional recovery device for injection of eco-friendly filler according to the present invention.
Figure 2 is a front view of Figure 1.
Figure 3 is an enlarged view of an auxiliary bracket for the high-strength cross-sectional recovery device for injection of eco-friendly filler according to the present invention.
Fig. 4 is a front view with the blade of Fig. 1 omitted;
Figure 5 is a view showing the formation of a cutting part for the high-strength cross-section recovery device for injection of eco-friendly filler according to the present invention.
Figure 6 is an enlarged view showing the working relationship between the air nozzle and the camera in Figure 5.
Figure 7 is a diagram showing image information displayed on a mobile terminal regarding the high-strength cross-sectional recovery device for injection of eco-friendly filler according to the present invention.
Figure 8 is a flow chart showing a cross-sectional recovery method using a high-strength cross-sectional recovery device for injection of eco-friendly filler according to the present invention.
Figures 9 to 13 are operational relationships with respect to Figure 8.

Hereinafter, various embodiments will be described in more detail with reference to the attached drawings. The embodiments described herein may be modified in various ways. Specific embodiments may be depicted in the drawings and described in detail in the detailed description. However, the specific embodiments disclosed in the attached drawings are only intended to facilitate understanding of the various embodiments. Therefore, the technical idea is not limited to the specific embodiments disclosed in the attached drawings, and it should be understood that all equivalents or substitutes included in the spirit and technical scope of the invention are included.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by the above-mentioned terms. The above-mentioned terms are used only for the purpose of distinguishing one component from another.

In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

In addition, when describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof is abbreviated or omitted.

Hereinafter, with reference to the attached drawings, a high-strength cross-sectional recovery device (hereinafter simply referred to as 'recovery device') for injection of eco-friendly filler according to the present invention will be described in detail. Prior to explanation, the filler used in the present invention is injected into the crack (C) to improve adhesion to the ground (G) by applying primer, but is filled with conventional fillers including micro cement, water, layered silicate, and delayed AE water reducing agent. This refers to an eco-friendly filler, and in order to clearly describe the gist of the present invention, the description of the filler will be omitted.

First, as shown in FIGS. 1 to 3, the recovery device 1 according to the present invention largely includes a moving member 100, a driving member 200, and a control member 300.

In more detail, the moving member 100 is equipped with a driving member 200 and a control member 300, which will be described later, and the cutting operation of the crack C can be implemented with the operator standing. The configuration for this includes a moving body 110, a holder 120, an auxiliary bracket 130, and a roller fixing piece 140.

For example, the moving body 110 is configured so that the worker can stand up and move forward and backward along the longitudinal direction of the crack C, and cutting of the crack C can be realized by the driving member 200, and includes a handle 111, Includes wheels 113 and stoppers 115.

As shown, the mobile body 110 is formed to have a predetermined height through a plurality of brackets having lengths in the vertical and horizontal directions, and has a wheel 113 at the bottom that can rotate 360 degrees and fix the mobile body 110. It is provided to be rotatable.

The handles 111 are formed to protrude in pairs on the rear outer surface of the mobile body 110 and are connected to the mobile body 110, so that an external force that can move the mobile body 110 forward and backward can be easily applied when gripped by an operator.

At this time, it is preferable that the outer surface of the handle 111 is further provided with a pad (not shown) made of a material that absorbs shock and sweat, so that the moving body 110 can easily move along the shape of the crack (C).

As shown, the stopper 115 is formed to protrude from the front lower part of the moving body 110 to the upper side of the roller fixing piece 140 to have a predetermined length and is moved by the roller fixing piece 140 by rotation of the brush roller 230, which will be described later. If (140) bounces upward, stop it to prevent safety accidents for workers.

At this time, although not shown, when the foreign matter inside and around the crack (C) is removed by the rotation of the brush roller 230 in front of the moving body 110 equipped with the stopper 115, the foreign matter (small stone) is removed. It is preferable that a blocking film (not shown) is further formed on the upper part of the brush roller 230 to prevent rotational interference (e.g., etc.) from bouncing in the direction of the operator.

Meanwhile, in the present invention, an application nozzle (not shown) is further provided on the outer surface of the stopper 115, and an application roller (not shown) for applying the primer 30 instead of the brush roller 230 is installed on the roller fixing piece 140. ), it is also possible to spray the liquid primer 30 on the outer surface of the application roller so that the primer 30 can be applied after the cutting portion 20 is formed.

In addition, as shown, the holder 120 is molded to have the shape of a plate on the upper part of the mobile body 110 and is inclined at a predetermined angle, allowing the mobile terminal 320 to be mounted to visually check image information. The configuration for doing so includes an adjustment plate 121 and a stand 123.

At this time, although not shown, an electrical connection is made between the mobile terminal 320 and the control panel 310, which is seated on the outer surface of the holder 120, so that charging or image information of the mobile terminal 320 can be implemented through a cable. It is preferred that one or more through holes are perforated.

The control plates 121 are provided in pairs symmetrically at a predetermined interval on the outer surface of the holder 120 mounted on the mobile terminal 320, and at least one of the pair of control plates 121 is attached to the holder 120. It has a structure in which the side of the mobile terminal 320 can be pressed and fixed by elastic force according to the width of the mobile terminal 320 that is mounted and installed to be slideable.

As shown, the stand 123 is formed to protrude from the front lower part of the stand 120 toward the operator and supports the lower surface of the mobile terminal 320 seated on the stand 120.

In addition, the auxiliary bracket 130 is used to enable at least one of the drive motor 210, air nozzle 240, camera 330, and blade 220, which will be described later, to be installed integrally with the moving body 110. It is a composition.

For this purpose, the auxiliary bracket 130 can be fixedly installed on the outer surface of the mobile body 110 using fastening means such as bolts or screws or welding to have an overall 'ㄱ' shape. As shown as an example, the upper surface is A drive motor 210 is fixedly installed, and a blade 220 is coupled to the outer surface so that it can rotate by the drive motor 210.

At this time, a bent portion 131 is formed at the lower part of the auxiliary bracket 130 to have a predetermined inclination, and an air nozzle 240 and a camera 330 are controlled by the control panel 310 at the bent portion 131. It is installed so that in the process of cutting the crack (C), the cutting process is captured by the camera 330 and provided as image information, and clear image information is secured or dust generated during the cutting process is removed from the cutting unit (20). ), it is desirable to prevent it from entering the air by the air sprayed from the air nozzle 240.

In addition, as shown, a pair of roller fixing pieces 140 are disposed adjacent to each other in front of the moving body 110, one side of which is axially coupled to the moving body 110 to enable free rotation, and the other side has a brush roller 230. ) It has a structure in which both sides are rotatably coupled to each other.

Here, the reason why the brush roller 230 is rotatably coupled to the roller fixing piece 140 is that the lower part of the brush roller 230 always moves depending on the condition of the ground (G) on which the moving object 110 moves. This is to enable contact with the ground (G), that is, the crack (C).

In addition, as shown in FIGS. 4 to 6, the driving member 200 is movably installed by the above-described moving body 110 to remove foreign substances present in or around the crack C before cutting. It is configured to cut the ground (G) to a predetermined depth in the longitudinal direction of the crack (C) and includes a drive motor 210, a blade 220, a brush roller 230, and an air nozzle 240.

For example, as shown, the drive motor 210 is fixed to the auxiliary bracket 130 to rotate under the control of the control panel 310, and at least two gears 213 are installed on the outer surface of the drive shaft of the drive motor 210. It is rotatably provided so that rotation of the brush roller 230 as well as the blade 220 connected to the chain 211 can be achieved simultaneously through rotation of the gear 213.

In this process, the rotation direction of the drive motor 210 is set so that when the blade 220 and the brush roller 230 operate, dust or foreign matter caused by cutting can be discharged in the opposite direction where the worker is located.

In addition, the blade 220 is generally formed in the shape of a disk with a predetermined diameter, and its center is rotatably coupled to the auxiliary bracket 130, and is connected to the gear 213 through a chain 211 to operate the drive motor. It has a structure that rotates by receiving the rotational force of (210).

At this time, as shown, the bottom of the blade 220, which implements the cutting operation along the crack (C), performs a cutting operation to a depth (D) of 0.2 mm to 0.5 mm inside the ground (G), so that the filler is in the cutting part. (20) It is desirable to sufficiently insert it inside so that the rigidity of the building undergoing cross-sectional restoration can be improved.

In addition, as shown, the brush roller 230 is provided with a plurality of protruding brushes to have a predetermined area on the outer surface of the rotating shaft, so that the brush roller 230 is provided inside the crack C as well as around the crack C through rotation of the rotating shaft. Remove foreign substances (see Figure 1).

To this end, a roller gear is formed on the outer surface of the rotation shaft to receive the rotational force of the drive motor 210 by the chain 211, and has a structure in which the brush roller 230 can rotate through rotation of the roller gear.

The brush roller 230 is rotatably coupled to a shaft by a pair of roller fixing pieces 140, and descends in the direction of the ground (G) by its own weight to remove foreign substances through the free rotation of the roller fixing pieces 140. Make it easy to remove.

The air nozzle 240 is provided at the bent portion 131 of the auxiliary bracket 130, and cuts the air supplied through the external air supply unit 10 in the direction of the crack C, specifically by the blade 220. By discharging air to the point where the cutting unit 20 is formed, foreign substances inside the cutting unit 20 as well as dust-type foreign substances that may obstruct the view of the camera 330 are discharged to the outside of the moving body 110 so that they can be dispersed by the discharge pressure of the air. It scatters.

And, as shown in FIGS. 6 and 7, when the control member 300 performs the cutting operation of the crack C through the above-described driving member 200, the operator determines the degree of completion of the cutting operation through the moving body. It is configured to enable easy identification while moving 110 and includes a control panel 310, a mobile terminal 320, and a camera 330.

For example, the control panel 310 is in the form of a display capable of controlling the operation of the driving member 200 by touch, and has a handle 111 so that the operator can operate it while moving the moving object 110 through a detachable strap 311. Of course, it is used by being detachably coupled to the outer surface of the mobile body 110.

The control panel 310 is electrically connected to the camera 330 as well as the driving member 200 so that it can be controlled by cable or remotely, so as to control the image information captured by the camera and the driving member 200. , The received video information is transmitted to the mobile terminal 320 so that the worker can visually check it.

In addition, the mobile terminal 320 refers to any one of displays such as a typical smartphone, tablet, and laptop carried by a worker, and is mounted on the holder 120 to display image information transmitted from the control panel 310. make it possible

At this time, the image information transmitted to the mobile terminal 320 is stored in the mobile terminal 320 and can be used as a means for the requester to check the status of the work performed by the worker.

In addition, the camera 330 is installed on the bent portion 131 in close proximity to the air nozzle 240, and captures the cutting operation of the crack C by the blade 220 in real time and transmits the image information to the control panel 310. It is preserved in

Hereinafter, with reference to the attached drawings, a cross-sectional recovery method using a high-strength cross-sectional recovery device for injection of eco-friendly filler according to the present invention (hereinafter briefly referred to as 'recovery method') will be described in detail.

First, as shown in FIG. 8, the repair method (2) according to the present invention largely includes 1) cutting the crack (S10), applying a primer (S20), and injecting a filler (S30). ) and grinding process step (S40).

9 to 13, the operator holds the handle 111 of the moving body 110 equipped with the driving member 200 and the control member 300 to execute step 1) and places it on the ground. After arranging the lower end of the blade 220 to be inserted into the crack (C) along (G), the moving body 110 is pushed along the crack (C) and moves along the longitudinal direction of the crack (C).

That is, the operator operates the drive motor 210 through manipulation of the control panel 310 to control the blade 220 and the brush roller 230 to rotate, preferentially removing foreign substances present in the crack C through the brush roller ( While removing through rotation of 230, a cutting portion 20 in which a cutting operation is performed is formed in the crack C through rotation of the blade 220.

In this process, the worker moves the moving object 110 while checking the cutting process of the crack C by the blade 220 with the image information displayed on the mobile terminal 320, thereby improving the work speed compared to the prior art. Of course, step 1) is completed so that the advantage of reducing worker fatigue can be realized.

Afterwards, when the cutting part 20 is formed through the above-described step 1), the operator applies the primer 30 diluted with water to the inside of the cutting part 20 as well as the surrounding area using a roller to cover the primer (30). After applying 30), perform step 2) of drying for a certain period of time.

At this time, the primer 30 is used to increase the adhesion with the filler 40 to be worked on later. The primer 30 stock solution is diluted with water, and the dilution ratio is when the primer 30 is 1 and the water is 3. It is desirable to dilute it in a phosphorus ratio so that the adhesion between the filler 40 and the inside of the cut portion 20 can be improved.

Meanwhile, although not shown, the worker dismantles the brush roller 230 constituting the recovery device 1 in the present invention from the roller fixing piece 140 and then attaches the primer 30 to the roller fixing piece 140. An application roller (not shown) capable of applying is rotatably mounted, and an application nozzle connected to a tank containing water and the diluted primer 30 is installed on the stopper 115, so that the application can be applied by the movement of the mobile body 110. It is also possible to enable application of the primer 30 to be implemented.

Afterwards, step 3) is completed in which the eco-friendly filler 40 is injected into the cut part 20 where the dried primer 30 is applied, and the cross-section is restored by curing for a certain period of time.

Finally, the recovery method (2) according to the present invention is completed by executing step 4) in which the worker grinds the hardened filler (40) and flattens it with the ground (G).

As described above, the recovery device 1 according to the present invention not only shortens the pretreatment process time for concrete cracks C, but also reduces the cost required for pretreatment, unlike the conventional one, regardless of the worker's skill level. This achieves the effect of improving the completeness of the cutting part 20 for injecting the eco-friendly filler 40 and reducing fatigue at the same time.

As described above, the present invention has been described with specific details such as specific components and limited embodiments and drawings, but this is only provided to facilitate a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , those skilled in the art can make various modifications and variations from this description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and the scope of the patent claims described later as well as all things that are equivalent or equivalent to the scope of this patent claim shall fall within the scope of the spirit of the present invention. .

1: High-strength cross-section recovery device for injection of eco-friendly filler according to the present invention
2: Cross-section recovery method using a high-strength cross-section recovery device for injection of eco-friendly filler according to the present invention
100: moving member
110: moving body 111: handle
113: wheel 115: stopper
120: stand 121: control panel
123: stand 130: auxiliary bracket
131: Bend portion 140: Roller fixing piece
200: Driving member
210: Drive motor 211: Chain
213: gear 220: blade
230: Brush roller 240: Air nozzle
300: Control member
310: Control panel 311: Strap
320: mobile terminal 330: camera
C: crack
G: ground

Claims (6)

A moving member 100 moving along a crack (C) formed in the ground (G);
It is installed on the moving member 100, but the crack (C) is cut into a 'V' or 'U' shape for injection of eco-friendly filler, and foreign matter existing in or around the crack (C) before cutting the crack (C) A driving member 200 that removes; and
An eco-friendly filler injection comprising a control member 300 that photographs the crack C where cutting is performed by the driving member 200 and displays the captured image information to check whether the cutting is accurate. High-strength cross-sectional recovery device for.
According to paragraph 1,
The moving member 100 is
A mobile body 110 formed to have a predetermined height and equipped with wheels 113 at the lower part that move or are fixed along the ground (G);
A holder 120 formed on the mobile body 110 and on which the control member 300, on which image information is displayed, is detachably mounted;
An auxiliary bracket 130 formed on the outer surface of the moving body 110 and equipped with the control member 300 for photographing the crack C and the driving member 200 for spraying air supplied from the outside in the direction of the crack C. ); and
A roller fixing piece 140 on which the driving member 200 is installed, which protrudes in front of the moving body 110 and removes foreign substances present in the crack C before cutting by rotation. High-strength cross-sectional recovery device for eco-friendly filler injection.
According to paragraph 2,
The driving member 200 is
A driving motor 210 installed on the auxiliary bracket 130 to rotate under the control of the control panel 310;
A blade 220 installed on the moving body 110 to rotate by the driving motor 210 and cutting the crack C by rotation;
A brush roller 230 that is rotatably installed on the roller fixing piece 140 to rotate by the drive motor 210 and removes foreign substances present in the crack (C) by rotation; and
An air nozzle 240 installed on the auxiliary bracket 130 and spraying air supplied from the outside in the direction of the crack C,
A high-strength cross-sectional recovery device for injection of eco-friendly filler, characterized in that the insertion depth (D) of the lower part of the blade (220) inserted into the crack (C) for cutting is 0.2 mm to 0.5 mm.
According to paragraph 2,
The control member 300 is
A control panel 310 that controls the driving member 200;
a mobile terminal 320 detachably mounted on the holder 120 so that image information transmitted to the control panel 310 can be displayed; and
A high-strength cross-sectional recovery device for injection of an eco-friendly filler, comprising a camera 330 installed on the auxiliary bracket 130 to capture image information to be transmitted to the control panel 310.
1) Move the mobile body 110 along the ground (G) where the crack (C) is formed and preferentially remove foreign substances present in the crack (C) by the brush roller 230 rotatably installed on the mobile body 110. Cutting the crack (C) in a 'V' shape or 'U' shape by a blade 220 that rotates while doing so;
2) Applying a primer diluted with water to the cut portion 20 and drying it for a certain period of time;
3) Injecting an eco-friendly filler into the cutting part 20 to which the primer is applied and curing it for a certain period of time; and
4) A cross-section recovery method using a high-strength cross-section recovery device for injection of eco-friendly filler, comprising the step of grinding the hardened filler to make it flat with the ground (G).
According to clause 5,
In step 1), the cutting of the crack (C) by the blade 220 transmits the image information captured by the camera 330 to the mobile terminal 320 mounted on the upper part of the moving object 110 through the control panel 310. It is displayed so that cutting is done while visually identifying the cutting process of the crack (C).
A cross-section recovery method using a high-strength cross-section recovery device for injection of eco-friendly filler, characterized in that the mixing ratio of the primer and water in the solution diluted in step 2) is mixed at a ratio of 1:3.

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