KR102296039B1 - Crack repair method of concrete structure - Google Patents

Abstract

The present invention provides a method for stably repairing a crack generated on an outer wall of a concrete structure such as an apartment house. Disclosed is the crack repair method of a concrete structure, which comprises: a process of forming a V-shaped groove by engraving a portion where a crack is generated on the outer wall of the concrete structure at a predetermined depth; a process of forming a fixing hole by drilling a hole of a predetermined depth in a diagonal direction on both sides of the V-shaped groove; a process of removing concrete pieces and foreign substances remaining in the fixing hole and the V-shaped groove; a process of filling and solidifying an adhesive material in the fixing hole to form a fixing member and forming an end part of the fixing member to be exposed and bent toward the inside of the V-shaped groove; a process of applying a waterproofing agent into the V-shaped groove; and a process of filling a crack repair material into the V-shaped groove.

Description

Crack repair method of concrete structure {CRACK REPAIR METHOD OF CONCRETE STRUCTURE}

The present invention relates to a method for repairing cracks in a concrete structure, and more particularly, to a method for easily repairing cracks occurring on an outer wall of a concrete structure such as an apartment house and maintaining the repaired state in a good and stable manner.

In general, the external wall of concrete structures cracks as the construction of the structure according to the change of the outdoor environment such as the season change, the temperature difference between the inside and outside, the drying shrinkage, and the service life elapses. Of course, maintenance is required.

The concrete crack repair method is a surface treatment method that forms a coating film on a large fine crack (less than 0.2mm in width), and cuts the concrete by about 10mm along the crack (width 0.5mm or more) and places a crack repair material (elastic putty) on the cut part There is a filling method that fills the crack, and an injection method that installs an injection pipe at an interval of 10 to 30 cm in the crack and injects a resin-based or cement-based material.

Among them, the filling method is mainly applied when the cracks are large enough to cause water leakage or to affect the aging of reinforcing bars and concrete. The upper elastic putty is deeply filled.

However, when this conventional crack repair method is applied to repair cracks on the outer wall of a concrete structure such as an apartment house, the crack repair material is vulnerable to external environmental changes such as weathering and deterioration. As the adhesive force (coupling force) is weakened, cracks occur again and there is a problem in that it falls off easily.

The background art or prior art described herein is information possessed by the inventor or acquired in the process of deriving the present invention, and is only intended to help understand the technical meaning of the present invention, and prior to the filing of the present invention, the technology to which this invention belongs It does not mean that the technology is widely known in the field.

US 10-2147348 B1 (2020.08.18) US 10-1975944 B1 (2019.04.30) US 10-2016-0125654 A (2016.11.01)

Accordingly, the present inventor comprehensively considers all the above matters and at the same time, from the idea of solving the technical limitations and problems of the existing crack repair method of concrete structures, it is possible to easily repair cracks occurring in the outer walls of concrete structures such as apartment houses. In the course of continuous research to develop a new crack repair method for concrete structures that can achieve the effect of stably maintaining good condition by preventing lifting and dropping due to deterioration in bonding strength of crack repair materials. As a result, the present invention was created.

Therefore, the technical problem and object to be solved by the present invention is to provide a crack repair method of a concrete structure that can easily repair cracks occurring on the outer wall of the concrete structure.

Another technical problem and object to be solved by the present invention is to provide a crack repair method of a concrete structure that can prevent the lifting and dropping of the crack repair material.

Here, the technical problems and objects to be solved by the present invention are not limited to the technical problems and objects mentioned above, and other technical problems and objects not mentioned will be clearly understood by those skilled in the art from the following description.

Specific means according to an aspect of the present invention for effectively achieving a specific technical purpose while embodying a new idea for solving the technical problem of the present invention as described above are (A) cracks in the outer wall of the concrete structure A step of forming a V-groove by digging a cracked portion to a certain depth, (B) a step of forming a fixing hole by digging a hole of a certain depth in an oblique direction on both sides of the V-groove, (C) the V-groove and A step of removing concrete fragments and foreign substances remaining in the fixing hole, (D) filling and curing an adhesive material in the fixing hole to form a fixing member, but inside the V groove A step of forming the end in a protruding and bent state, (E) a step of applying a waterproofing agent in the V-groove, and (F) a step of filling the V-groove with a crack repair material. A crack repair method is presented.

Accordingly, according to the present invention, it is possible to easily repair cracks occurring on the outer wall of a concrete structure, as well as to prevent lifting and dropping of the crack repair material, thereby maintaining a good state.

In addition, in a preferred embodiment (aspect) of the present invention, in the steps (A) and (B), the V-groove and the fixing hole are formed in a state in which the scattering prevention device is in close contact with the outer wall of the concrete structure to form the concrete in this process. It can prevent scattering of debris, dust, and cement dust.

In addition, as a preferred embodiment of the present invention, the rail frame, the V-groove and the fixing hole that are in close contact with the outer wall of the concrete structure are formed in a quadrangular truncated or funnel shape to prevent scattering of concrete fragments and dust. , A bellows for inserting the electric drill so that the angle can be adjusted is formed in the central part, the suction hole is formed on one side, and the scattering prevention cap and the scattering prevention cap provided with sliders that slide along the guide of the rail frame at both ends. By utilizing a scattering prevention device consisting of a vacuum suction device that sucks concrete fragments and dust through the suction hole of the prevention cap, the V-groove and fixing hole can be formed quickly and easily while stably adhering to the outer wall of the concrete structure. In addition, concrete debris and dust can be cleaned more effectively, improving the working environment.

In addition, in a preferred embodiment (aspect) of the present invention, in the step (d), the fixing member overcharges the adhesive material in the fixing hole so that the end protruding (exposed) into the V-groove is formed. It can be formed by bending it and curing it in an inwardly curved state.

According to the technical idea and embodiment of the present invention, which is based on a unique solution to solve the above technical problem, the fixing member with the protruding end bent inward of the V groove is fixed to the inner wall of the V groove and formed By doing so, when the repair is completed, the fixing member securely holds the crack repair material and thus stabilization can be realized to prevent lifting and dropping.

That is, due to the anchor effect in which the fixing member mechanically holds the crack repair material, the crack repair material is not separated from the V-groove and a good and stable bonding state can be maintained.

Therefore, water resistance and durability can be greatly improved by minimizing the performance degradation of the repair part when subjected to various actions of weather (climate).

In addition, the V-groove and fixing hole are formed with the scattering prevention device attached to the outer wall of the concrete structure. It is possible to provide a safe and comfortable working environment by preventing it from being discharged into the middle.

Here, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a process diagram schematically showing a crack repair method of a concrete structure according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a scattering prevention device used for a crack repair method of a concrete structure according to an embodiment of the present invention.

Hereinafter, an embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

Prior to this, the following terms are defined in consideration of the functions in the present invention, and it is specified that they should be interpreted as concepts consistent with the technical spirit of the present invention and meanings commonly or commonly recognized in the art.

In addition, if it is determined that a detailed description of a well-known function or configuration related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted.

The accompanying drawings show that parts are exaggerated or simplified for the sake of convenience and clarity of explanation and understanding of the configuration and operation of the technology, and it is revealed that each component does not exactly correspond to the actual size and shape.

In addition, in this specification and/or the term "and/or" is meant to include a combination of a plurality of related described items or any of a plurality of related described items, and when a part includes a certain component, it is a particularly opposite description This does not mean that other components are excluded, but other components can be further included.

That is, terms such as 'include' or 'include', 'have', etc. mean that the features, number, steps, operations, components, parts, or combinations thereof described in the present specification exist. However, it is to be understood that this does not exclude the possibility of addition or existence of one or more other features or numbers, step operation components, parts, or combinations thereof.

In addition, each step may occur in a different order from the stated order unless the context clearly indicates a specific order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

And terms such as upper, lower, upper, lower, upper, lower, upper, lower, front and rear, left and right are used for convenience to distinguish relative positions of each component. For example, the upper side in the drawing may be named or referred to as the upper side and the lower side as the lower side, the longitudinal direction may be named or referred to as the front-back direction, and the width direction may be named or referred to as the left/right direction.

Also, terms such as first, second, etc. may be used to describe various components. That is, terms such as 1st, 2nd, etc. may be used only for the purpose of distinguishing one component from another component. For example, a first component may be referred to as a second component without departing from the scope of the present invention, and the second component may also be referred to as a first component.

As shown in FIGS. 1 and 2 , the crack repair method of a concrete structure according to an embodiment of the present invention consists of each of the following steps.

(A) V-groove formation process

A V-groove (10) is formed by digging the crack (C) part of the outer wall (W) of the concrete structure to a certain depth.

That is, as in Figs. 1 (a) and (b), using a tool such as an electric drill (D), the periphery of the crack (C) part of the outer wall (W) is V-cutting method. Dig out to form a V-shaped groove.

At this time, it is possible to prevent the scattering of concrete fragments and dust by forming the V-groove 10 in a state in which the scattering prevention device 60 is in close contact with the outer wall W of the concrete structure as shown in FIG. 2 .

(B) Fixing hole forming process

A plurality of fixing holes 20 are formed by making holes of a certain depth in an oblique direction on both sides of the V-groove 10 .

That is, a plurality of fixing holes 20 are formed obliquely on both inner walls of the V-groove 10 opposite to each other by using a tool such as an electric drill D as shown in FIG. 1(c).

At this time, it is possible to prevent the scattering of concrete fragments, dust, and cement dust by forming the fixing hole 20 in a state in which the scattering prevention device 60 is in close contact with the outer wall W of the concrete structure as shown in FIG. 2 .

Here, the scattering prevention device 60 includes a rail frame 61 that is in close contact with the outer wall W in a state of being suspended from a wire coming down from the roof of the concrete structure, and a V groove 10 and a fixing hole 20 with an electric drill (D). ) to prevent scattering of concrete fragments and dust when digging, through a scattering prevention cap 62 formed in a square pyramid or funnel shape and a suction hole 64 drilled on one side of the scattering prevention cap 62, concrete fragments and dust It includes a vacuum aspirator 66 for sucking the.

And the central portion of the scattering prevention cap 62 is formed with a bellows 63 for flexibly adhering while adjustable the working angle of the electric drill (D).

In addition, sliders 65 that slide along the guide of the rail frame 61 are mounted on both ends of the anti-scattering cap 62 .

Therefore, by using the scattering prevention device 60 when digging the V-groove 10 and the fixing hole 20 using the electric drill (D) in the outer wall (W) of the concrete structure, concrete fragments, dust, cement dust, etc. are scattered Alternatively, it is possible to improve the working environment by not only preventing it from being released into the atmosphere, but also cleaning it more effectively.

(C) Foreign matter removal process

Remove concrete fragments and various foreign substances remaining in the V-groove 10 and the fixing hole 20 .

That is, the inside of the V-groove 10 and the fixing holes 20 is brushed away [swept] or sprayed with high-pressure water, compressed air, etc. to remove foreign substances and clean them.

(D) Fixing member forming process

A plurality of fixing members 30 are formed by filling and curing an adhesive material in the fixing hole 20 .

That is, as shown in (d) of FIG. 1, each end of the fixing member 30 is exposed and bent to the inside of the V-groove 10 to form a state having the protruding end 31.

For example, each fixing member 30 overcharges the adhesive material in the fixing hole 20 to slightly expose (protrude) the inside of the V-groove 10, hold the protruding end and bend it. It can be formed in a form having the protruding end 31 integrally by curing it in a curved state.

The protruding end 31 of the fixing member 30 forms a hook-shaped protrusion like a hook, and serves to firmly hold the crack repair material in tight contact with the inner wall of the V-groove 10 .

Here, as the adhesive material forming the fixing member 30, it is preferable to employ a material having excellent adhesion and elasticity and high adhesion, such as silicone synthetic rubber or urethane sealant, which does not easily change shape even at high and low temperatures.

As another example, the protruding end 31 of the fixing member 30 may be cut in a multi-pronged state and then press-molded in an expanded form may be applied.

(E) Waterproofing agent application process

A waterproofing agent 40 is applied in the V-groove 10 .

That is, the waterproofing agent 40 is applied in the V-groove 10 using a brush or a spray gun, as in FIG. 1E .

Here, the method of applying the waterproofing agent is not limited, but preferably, it can be uniformly applied over the entire area by spraying at a pressure of about 1 to 5 kgf/m 2 using a spray gun.

In addition, although the amount and thickness of the waterproofing agent are not limited, it is preferable to apply the waterproofing agent as thinly as possible to satisfy the purpose of waterproofing.

In addition, as the waterproofing agent, an acrylic rubber-based or chloroprene rubber-based waterproofing agent having elasticity and elasticity may be used.

On the other hand, by additionally applying the rust-preventing primer composition to the inside of the V-groove 10, the adhesion with the crack repair material can be increased and a separate rust-preventing operation can be omitted.

(F) Crack repair material filling process

The crack repair material 50 is filled in the V-groove 10 .

That is, as shown in (f) of FIG. 1, the crack repair material 50 is injected into the V-groove 10 at low or high pressure using a syringe, etc., to be completely filled, and dried naturally to sufficiently harden.

And after the crack repair material 50 is hardened, a finishing operation may be performed to have a flat surface with the outer wall (W).

For example, the rough part may be flattened using a work tool such as a chisel or a grinder.

Here, the crack repair material 50 is a paste-like elastic putty or an acrylic resin sealer that has no fracture deformation even with changes in external environment such as temperature and has excellent waterproof performance and crack resistance to prevent additional cracks from occurring in the repair part. can

In particular, elastic putty responds stably to changes in climate and temperature due to high adhesion and high elasticity, excellent waterproofness, weather resistance, chemical resistance, flexibility, etc., and also forms a coating film to completely block the penetration of water into cracks.

On the other hand, by adding a mesh-type mesh to the V-groove 10 before injection of the crack repair material, it is possible to further strengthen the strength of the crack repair material 50 and prevent movement and separation.

As such, in the crack repair method of the concrete structure according to the embodiment of the present invention, there is no lifting and dropping of the crack repair material 50 due to the decrease in the adhesiveness of the repair part, so that the re-crack does not occur after the crack repair, so it is semi-permanent with one-time construction Not only can the maintenance condition be stably maintained, but the durability of the concrete structure can be extended because the cracks of the outer wall (W) do not expand.

Here, of course, the crack repair method of a concrete structure according to an embodiment of the present invention can be applied to various concrete structures such as an apartment, a house, an exterior wall of a factory, and a window frame.

On the other hand, the present invention is not limited by the above-described embodiment and the accompanying drawings, and can be variously modified and applied in various ways not illustrated within the scope without departing from the technical spirit of the present invention, as well as each It is apparent to those of ordinary skill in the art to which the present invention pertains that it can be widely applied by changing the substitution of components and other equivalent embodiments.

Therefore, the contents related to the modification and application of the technical features of the present invention should be interpreted as being included within the technical spirit and scope of the present invention.

10: V groove 20: fixing hole
30: fixing member 31: protruding end
40: waterproofing agent 50: crack repair material
60: scattering prevention device W: outer wall
C: crack D: electric drill

Claims (4)

Crack repair method of concrete structure including each of the following steps.
(A) The process of forming a V-groove by digging a cracked part of the outer wall of a concrete structure to a certain depth
(B) A step of forming a plurality of fixing holes by making holes of a certain depth in an oblique direction on both sides of the V-groove
(C) A process of removing concrete fragments and foreign substances remaining in the V groove and the fixing holes
(D) A process of forming a plurality of fixing members by filling and curing an adhesive material in the fixing holes, but protruding and bending the ends of each fixing member into the V-groove
(E) The process of applying a waterproofing agent in the V-groove
(F) The process of filling the crack repair material in the V-groove
includes;
In the steps (A) and (B), the V-groove and the fixing hole are formed by attaching a scattering prevention device that prevents scattering of concrete fragments and dust to the outer wall of the concrete structure,
The scattering prevention device,
Rail frame in close contact with the outer wall of the concrete structure; It is formed to prevent scattering of concrete fragments and dust when the V groove and the fixing hole are formed, and a bellows for inserting the electric drill in an angle-adjustable manner is formed in the center, a suction hole is formed on one side, and both ends are formed a scattering prevention cap provided with a slider that slides according to the guide of the rail frame; and a vacuum suction device that sucks concrete fragments and dust through the suction hole of the scattering prevention cap;
In the step (d), the fixing member is formed by overcharging the adhesive material in the fixing hole and bending the end protruding into the V-groove to harden it in an inwardly curved state. Crack repair method of concrete structure.
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