KR102359608B1 - Metal thermal spray method for concrete shielding electromagnetic wave - Google Patents

Abstract

Disclosed is an electromagnetic wave shielding concrete metal spray method. The metal spray method according to the present invention comprises the following steps of: installing a mesh member on a concrete surface that is a target of metal spray construction; and forming a metal film by performing metal spraying on the concrete surface on which the mesh member is installed. According to the present invention, adhesion strength between the concrete surface and the metal film is increased, and cracking and delamination of the metal film are prevented to secure electromagnetic wave shielding performance so as to improve construction quality.

Description

Electromagnetic wave shielding concrete metal spraying method

The present invention relates to a metal spraying method for electromagnetic wave shielding concrete, and more particularly, a metal that provides electromagnetic wave shielding performance by forming a metal film on the concrete surface of infrastructure facilities or structures such as power, communication, energy, and data centers. It's about the warrior technique.

Recently, damage caused by electromagnetic waves in infrastructure facilities or structures such as power, communication, energy, and data centers has become an issue. In particular, when high-altitude electromagnetic waves are generated, not only electronic equipment, but also major infrastructure facilities such as power grids and communication networks can be paralyzed in an instant over a radius of up to several hundred km, which can cause fatal damage.

Accordingly, electromagnetic wave shielding construction is being performed to secure electromagnetic wave shielding performance in the concrete constituting the wall of the facility or structure so that major infrastructure facilities or structures such as power and communication are not damaged when electromagnetic waves are generated.

Representative electromagnetic wave shielding construction methods include 1) installing a metal shielding plate, such as galvanized plate, copper plate, or steel plate, which is known to have excellent electromagnetic wave shielding performance, on concrete, and 2) using metal spray to coat the concrete surface with a metal film There are ways to form

First, in the electromagnetic wave shielding construction method using a shielding plate, there is a possibility that electromagnetic waves may be introduced from the assembly or joint parts such as welding and bolts in the process of installing a metal shielding plate of a certain thickness (for example, 3 to 5 mm) on concrete, In addition, since the manufacturing cost of a metal shielding plate such as a galvanized plate, a copper plate, and a steel plate is high, there is a problem in that the construction cost increases.

Next, in the electromagnetic wave shielding construction method using metal spray, a metal spray layer or a metal film is formed by particles by heating or melting the metal spray material using an automated metal spraying facility or a metal spraying event to form fine particles and collide with the concrete surface. There are no assembly parts such as welding and bolts, and it has the advantage that it can be widely applied not only to new facilities but also to pre-installed facilities.

However, in this metal spraying method, if the adhesion strength between the concrete surface to be constructed and the metal film is not sufficiently or stably secured, cracks or peeling may occur in the formed metal film, thereby securing the required electromagnetic wave shielding performance. It is difficult and can cause problems in construction quality.

As related prior art documents, Korean Patent Publication No. 10-0679307 (title of the invention: a building member with a metal layer and a manufacturing method therefor, publication date: February 06, 2007) and Korean Patent Application Laid-Open No. 10-2018 -0042561 (title of the invention: concrete wall structure for electromagnetic wave shielding, publication date: April 26, 2018) and the like.

An object of the present invention is to increase the adhesion strength between the concrete surface and the metal film and prevent cracking and peeling of the metal film to secure the required electromagnetic wave shielding performance, and further improve the electromagnetic wave shielding performance as a result It is to provide an electromagnetic wave shielding concrete metal spraying method that can contribute to the improvement of construction quality.

The above object includes the steps of installing a mesh member on a concrete surface to be subjected to metal spraying construction according to the present invention, and performing metal spraying on the concrete surface on which the mesh member is installed to form a metal film It is achieved by the electromagnetic wave shielding concrete metal spraying method, characterized in that.

Preferably, the mesh member acts to hold the base of the metal film with respect to the concrete surface in the step of forming the metal film, thereby increasing the adhesion strength between the concrete surface and the metal film and increasing the strength of the metal film. Cracking and peeling can be prevented.

Preferably, the mesh member may be provided as a conductive mesh member to exhibit electromagnetic wave shielding performance through a scattering effect.

Preferably, the conductive mesh member is made of a metal material of copper (Cu) or zinc (Zn)-aluminum (Al) alloy, and may be made of a wire mesh having a standard of 50 to 200 mesh.

Preferably, in the step of installing the mesh member on the concrete surface, the mesh member may be attached to the concrete surface by an epoxy resin.

Preferably, the electromagnetic wave shielding concrete metal spraying method may further include applying a surface reinforcing agent for reinforcing the concrete surface to the concrete surface before the step of installing the mesh member on the concrete surface.

Preferably, the surface reinforcing agent penetrates into the concrete to strengthen the surface from the inside of the concrete, and may be provided as a silicate-based liquid permeable surface reinforcing agent.

Preferably, in the electromagnetic wave shielding concrete metal spraying method, after the step of installing the mesh member on the concrete surface and before the step of forming the metal film, in order to stably secure the adhesion strength of the mesh member to the metal film The method may further include applying a roughening agent to the concrete surface on which the mesh member is installed.

Preferably, the roughening agent forms fine irregularities on the surface of the concrete on which the mesh member is installed, and may be provided by mixing silica sand No. 5 to No. 6 with an epoxy resin.

Preferably, the step of forming the metal film is performed by a metal spray gun, and the metal spray gun is mounted on the spraying case body, a spraying case body provided with a handle for gripping by an operator, and the concrete surface. A distance measuring sensor unit for measuring the distance, and determining whether the distance to the concrete surface measured by the distance measuring sensor unit is out of a preset distance range, and the operation of the metal spraying event according to the determination result It may include a control unit to control.

Preferably, when the distance to the concrete surface measured by the distance measuring sensor unit is out of a preset distance range, the control unit informs the worker that the appropriate distance for securing the construction quality of the metal spray is deviated A notification signal can be generated for

Preferably, when the state in which the distance to the concrete surface measured by the distance measurement sensor unit is out of a preset distance range continues for more than a preset time, the operator ignores it despite the notification signal, or In order to prevent the metal spraying operation from continuing outside the preset distance range inadvertently, the operation of the spraying spray body may be stopped.

The present invention relates to a metal spraying method for shielding electromagnetic waves, by installing a mesh member on the concrete surface and then performing metal spraying to form a metal coating, whereby the mesh member holds the base or foundation of the metal coating on the concrete surface. By doing this, it is possible to increase the adhesion strength between the concrete surface and the metal film and prevent cracking and peeling of the metal film, thereby securing the required electromagnetic wave shielding performance, and as a result, it can contribute to the improvement of construction quality.

In addition, in the present invention, by applying the mesh member as a conductive mesh member made of a metal wire mesh, electromagnetic wave shielding performance is added through the scattering effect by the conductive mesh member in addition to the electromagnetic wave shielding performance by the metal film, thereby shielding the entire electromagnetic wave performance can be further improved.

1 is a process flow chart for explaining the electromagnetic wave shielding concrete metal spraying method according to an embodiment of the present invention.
Figure 2 is a schematic view for explaining the configuration of the electromagnetic wave shielding concrete to which the electromagnetic wave shielding concrete metal spraying method of Figure 1 is applied.
3 is an image diagram of a wire mesh made of copper (Cu) used as a conductive mesh member in an embodiment of the present invention.
4 is a view for explaining the detailed configuration of the metal spraying case used in the electromagnetic wave shielding concrete metal spraying method according to an embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. However, in describing the present invention, descriptions of known functions or configurations will be omitted in order to clarify the gist of the present invention.

1 is a process flowchart for explaining the electromagnetic wave shielding concrete metal spraying method according to an embodiment of the present invention, and FIG. 2 is a schematic diagram for explaining the configuration of the electromagnetic wave shielding concrete to which the electromagnetic wave shielding concrete metal spraying method of FIG. 1 is applied. .

1 and 2, the electromagnetic wave shielding concrete metal spraying method according to this embodiment includes the steps of applying a surface reinforcing agent to the concrete surface (S110), installing a mesh member on the concrete surface (S120), the concrete surface It may include sequentially applying the rough surface forming agent (S130), and performing a metal spray on the concrete surface to form a metal film (S140).

First, the step of applying the surface reinforcing agent to the concrete surface (S110) is a step of applying the surface reinforcing agent to the concrete surface in order to improve the surface strength of the concrete and increase adhesion, whereby the concrete ( A surface reinforcement layer (H) may be formed on the surface of C).

Here, the surface reinforcing agent is preferably a permeable surface reinforcing agent that penetrates into the concrete and strengthens the surface from the inside of the concrete, and in this embodiment, a silicate-based (silicic acid-based) liquid permeable surface reinforcing agent is used.

Next, the step of installing the mesh member on the concrete surface (S120) is to prevent cracks (cracks) or peeling from occurring in the metal film (S, FIG. 2 ) formed by metal spraying in the subsequent step S140, a surface reinforcing agent It is a step of attaching the mesh member (M) as shown in Figure 2 to the coated concrete surface. That is, the mesh member (M) acts to stably hold the base or foundation of the metal film (S) on the surface of the concrete (C), thereby increasing the adhesion strength between the concrete surface and the metal film, and cracking and peeling the metal film. phenomenon can be prevented.

In the present invention, the mesh member may be applied as a mesh member made of synthetic material, but is preferably applied as a conductive mesh member as in this embodiment. This is because, as mentioned above, the conductive mesh member increases the adhesion strength between the concrete surface and the metal film and prevents cracking and peeling of the metal film, as well as the electromagnetic wave shielding performance by itself due to the conductive material. Because. That is, when the conductive mesh member is applied in the present invention, electromagnetic wave shielding performance is added through the scattering effect of the conductive mesh member in addition to the electromagnetic wave shielding performance by the metal film, thereby further improving the overall electromagnetic wave shielding performance.

Specifically, the conductive mesh member is made of a metal material of a copper (Cu) or zinc (Zn)-aluminum (Al) alloy, and is made of a wire mesh having a size of 50 to 200 mesh. It is preferable in terms of prevention and electromagnetic wave shielding performance. For reference, FIG. 3 is an image diagram of a wire mesh made of copper (Cu) used as a conductive mesh member in this embodiment. However, in the present invention, the conductive mesh member is not limited to a metal wire mesh, and may be made of a conductive material other than a metal material.

Next, the step of applying the roughening agent to the concrete surface (S130) is a step of applying the roughening agent to the concrete surface in order to stably secure the adhesion strength of the mesh member to the metal film, thereby As shown, the rough surface forming layer (R) may be formed on the surface of the concrete (C) to which the mesh member (M) is attached. Since the rough surface forming layer (R) is formed with fine concavities and convexities, the surface roughness of the concrete (C) to which the mesh member (M) is attached increases, thereby stably securing the adhesion strength of the mesh member to the metal film.

Specifically, as the roughening agent, it is preferable to use a mixture of silica sand Nos. 5 to 6 with an epoxy resin in consideration of the material and specifications of the conductive mesh member.

Finally, the step of forming a metal film on the concrete surface (S140) is a step of forming a metal film for electromagnetic wave shielding by performing metal spraying on the concrete surface to which the mesh member is attached and the roughening agent is applied. In this case, the metal film is preferably formed to a thickness of several hundred μm in order to stably secure the required electromagnetic wave shielding performance (eg, 80 dB).

Here, the metal spray refers to a method of forming a metal spray layer or a metal film by particles by heating or melting a metal spray material as a type of surface processing method to form fine particles and collides with the surface of an object. The metal used for metal spraying may include at least one of stainless steel, tin, zinc, aluminum, zinc-aluminum alloy, shinju, gilt copper, bronze, brass, pure copper, silver, and nickel silver.

In this embodiment, arc spraying is applied among various metal spraying methods. Arc spraying is a method of generating arc heat between two metal wires and scattering molten metal with compressed air through arc heat to deposit it on the surface of the material. say Alternatively, other metal spraying methods such as powder spraying may be applied to the present invention. For reference, powder spray is a method of coating a spray material in powder form using oxygen and fuel gas as heat sources, and acetylene is mainly used as the fuel gas. In addition to this gas-type powder spray, powder spray using plasma may also be applied.

Such a metal spraying operation may be performed by a metal sprayer or may be performed by an automated metal spraying facility. The detailed configuration and operation principle of the metal spraying case or the metal spraying automation facility are widely known and are not the subject matter of the present invention, so a detailed description thereof will be omitted herein. For reference, the metal sprayer is provided in a 'gun' structure that the worker (constructor) can carry, and is a tool for performing metal spraying at an appropriate distance toward the concrete surface while gripped by the worker at the construction site. .

On the other hand, when the step (S140) of forming a metal film on the concrete surface as above is performed by a metal spraying event, the metal spraying applied to the present invention will be described as follows.

4 is a view for explaining the detailed configuration of the metal spraying case used in the electromagnetic wave shielding concrete metal spraying method according to an embodiment of the present invention.

Referring to FIG. 4 , the metal spraying case 100 according to the present embodiment includes a spraying case body 110 , a distance measuring sensor unit 120 , a notification providing unit 130 , and a control unit 150 .

The thermal spraying body 110 is provided in a 'Gun' structure provided with a handle for the operator to grip and performs metal thermal spraying on the concrete surface. For reference, in this embodiment, the thermal spraying body 110 is configured so that the arc spraying method is applied.

On the other hand, since the metal spray construction forms a metal film by the collision of the molten thermal spray particles, the workability such as the amount of scattering or the construction area per unit time is affected according to the distance between the metal spraying event and the concrete surface. That is, if the distance between the metal spraying event and the concrete surface is out of the proper distance or the optimal distance, cracks or peeling may occur in the formed metal film, which may make it difficult to secure required electromagnetic wave shielding performance. However, unlike the metal spraying automation equipment designed to maintain an appropriate distance, the metal sprayer performs the work while moving in the gripped ecology, so the distance between the metal sprayer and the concrete surface can be adjusted according to the worker's skill level or concentration. In some cases, it may not be possible to keep the proper distance.

In order to solve the problem of the metal spraying event, the metal spraying event 100 according to the present embodiment includes a distance measuring sensor unit 120 for measuring the distance to the concrete surface and a distance range in which the distance to the concrete surface is set in advance. It includes a control unit 150 for determining whether or not to deviate from.

The distance measurement sensor unit 120 measures the distance between the concrete surface and the target of the metal spraying construction, that is, between the spraying case body 110 and the concrete surface. Specifically, the distance measuring sensor unit 120 is mounted on the front of the spraying body 110 so as to face the concrete surface in a state in which the operator grips the spraying body 110 to measure the distance to the concrete surface. The distance measuring sensor unit 120 may be implemented as a laser sensor or an ultrasonic sensor capable of measuring a distance.

The control unit 150 is mounted on the thermal spraying body 110 in the form of a programmed IC chip or firmware, and determines whether the distance to the concrete surface measured by the distance measurement sensor unit 120 is out of a preset distance range do. Here, the 'preset distance range' is an appropriate distance range suitable for securing stable and reliable construction quality and thus electromagnetic wave shielding performance in metal spraying construction, and may be set to, for example, 30 ± 3 cm.

Then, the control unit 150 controls the operation of the metal spraying event 100 according to the result of determining whether the distance to the concrete surface measured by the distance measuring sensor unit 120 is out of a preset distance range.

Specifically, when the distance to the concrete surface is out of a preset distance range, the controller 150 may generate a notification signal to inform the operator that the distance to the concrete surface is out of the appropriate distance for securing the construction quality of the metal spray. Accordingly, since the operator can recognize that the distance between the spraying case body 110 and the concrete surface has deviated from the appropriate distance, pay attention again to correct the distance from the concrete surface to an appropriate distance and try to maintain it. And, when the distance to the concrete surface is again within the appropriate distance, that is, within a preset distance range due to the movement of the operator, the controller 150 no longer generates a notification signal. In this case, the notification signal generated by the control unit 150 is transmitted to the notification providing unit 130 .

On the other hand, if the distance to the concrete surface is out of a preset distance range, the control unit 150 temporarily or constant the operation of the spraying case body 110 in terms of blocking the metal spraying work in which the construction quality is not secured at all. It can be stopped for a period of time. And, when the distance to the concrete surface due to the movement of the operator comes back to an appropriate distance, that is, within a preset distance range, the control unit 150 may control the thermal spraying body 110 to operate in a finishing operation again.

Alternatively, when the distance to the concrete surface is out of a preset distance range, the control unit 150 generates a notification signal to inform the operator that the distance to the concrete surface is out of the appropriate distance to secure the construction quality of metal spraying once, If the state outside the preset distance range continues for more than a preset time (eg, 10 seconds), the operation of the thermal spray body 110 may be temporarily stopped or for a certain period of time. Accordingly, when the distance to the concrete surface is out of the preset distance range, the control unit 150 initially generates a notification signal to give the operator an opportunity to correct the distance to the concrete surface back to an appropriate distance while providing an appropriate By stopping the operation of the thermal spraying body 110 when the state out of the distance range continues for more than a preset time, the operator ignores this in spite of the notification signal or inadvertently continues the metal spraying operation while out of the appropriate distance range can be prevented from doing

The notification providing unit 130 provides a notification to the operator visually and/or audibly upon receiving a notification signal from the control unit 150 . Specifically, the notification providing unit 130 may be implemented as a warning light (eg, a red LED module) for providing a visual notification or a speaker for providing an audible notification. Accordingly, when the distance of the concrete surface is outside the preset distance range and a notification signal is received from the control unit 150, the notification providing unit 130 provides a visual notification to the operator by lighting a warning lamp, or a warning sound or voice through a speaker. A guide message can be printed. These warning lights and speakers may be mounted on an appropriate part of the thermal spraying body (110).

The invention is not limited to the above-described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations are included in the claims of the present invention.

S110: surface strengthening agent application step
S120: Mesh member installation step
S130: rough surface forming agent application step
S140: metal film forming step
100: metal spray case
110: the body of the dragon case
120: distance measurement sensor unit
130: notification providing unit
150: control unit

Claims (11)

Installing a mesh member on a concrete surface to be subjected to metal spraying construction; and
Including; performing metal spraying on the concrete surface on which the mesh member is installed to form a metal film;
Prior to the step of installing the mesh member on the concrete surface, applying a surface reinforcing agent for reinforcing the concrete surface to the concrete surface; further comprising,
After the step of installing the mesh member on the concrete surface and before the step of forming the metal film, in order to stably secure the adhesion strength of the mesh member to the metal film, rough surface on the concrete surface on which the mesh member is installed It further comprises; applying a forming agent;
The mesh member acts to hold the foundation of the metal film with respect to the concrete surface in the step of forming the metal film, thereby increasing the adhesion strength between the concrete surface and the metal film, and cracking the metal film and prevent peeling,
The mesh member is provided as a conductive mesh member to exhibit electromagnetic wave shielding performance through a scattering effect,
The step of forming the metal film is performed by a metal spray gun,
The metal spraying case, a spraying case body provided with a handle for gripping by an operator; a distance measuring sensor unit mounted on the thermal spraying body and measuring a distance from the concrete surface; and a control unit that determines whether the distance to the concrete surface measured by the distance measurement sensor unit is out of a preset distance range, and controls the operation of the metal spraying event according to the determination result;
The control unit, if the distance to the concrete surface measured by the distance measurement sensor unit is out of a preset distance range, an opportunity for the operator to correct the distance to the concrete surface back to the preset distance range Generates a notification signal to inform the operator that the appropriate distance to secure the construction quality of the metal spray is given to give the Electromagnetic wave shielding concrete metal spraying method, characterized in that the operation of the spraying case body is stopped when the state outside the preset distance range continues for more than a preset time to prevent continuing the work. delete delete According to claim 1,
The conductive mesh member,
Electromagnetic wave shielding concrete metal spraying method, characterized in that it is made of a metal material of copper (Cu) or zinc (Zn)-aluminum (Al) alloy and is made of a wire mesh having a size of 50 to 200 mesh. According to claim 1,
In the step of installing the mesh member on the concrete surface,
Electromagnetic wave shielding concrete metal spraying method, characterized in that the mesh member is attached to the concrete surface by an epoxy resin. delete According to claim 1,
The surface strengthening agent,
Electromagnetic wave shielding concrete metal spraying method, characterized in that it penetrates into the interior of the concrete and strengthens the surface from the inside of the concrete, and is provided as a silicate-based liquid penetrating surface reinforcing agent. delete According to claim 1,
The rough surface forming agent,
Electromagnetic wave shielding concrete metal spraying method, characterized in that it is provided by mixing silica sand No. 5 to No. 6 with an epoxy resin by forming fine irregularities on the surface of the concrete on which the mesh member is installed. delete delete

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