Method for cleaning members of a structure

Abstract

For the surface of a member of a structure that has been exposed to pollution sources such as wind and rain for a long period of over 10 years and has accumulated pollution, reduce the damage and environmental load associated with cleaning, enhance the safety of the work, and remove the pollution at high speed. 【Solution means】Atomize the chemical solution for removing pollution, blow it onto the surface of the member with wind, and move it in the surface direction and thickness direction of the member to remove the pollution.

Description

Technical Field

[0001] The present invention relates to a method for cleaning members of a structure with age-related damage.

Background Art

[0002] In recent years, long-term use (long life) has been required for wooden houses and other buildings. Generally, when more than about 10 years have passed since a building was constructed, deterioration and dirt (hereinafter, one or both of deterioration and dirt are referred to as "damage") caused by being exposed to dirt sources such as dust, dirt, wind, rain, and ultraviolet rays accumulate, and the strength and appearance are impaired. In order to use a building for a long period of time, "cleaning" to remove such age-related damage at an appropriate time and in an appropriate manner, and a regeneration process such as applying a protective coating as necessary after removing the dirt are required.

[0003] Conventionally, as a method for removing dirt from a single board (solid wood material) or a single piece of wood used in a wooden building, "scrubbing" has been performed. In "scrubbing", multi-stage processing such as "scrubbing (dirt removal)" to remove dirt adhering to the wood surface with chemicals, "bleaching" to remove stains, sunburn, mold stains, etc. that have penetrated into the wood, and "rinsing (finishing wash)" to rinse and remove the chemicals used for dirt removal and bleaching is performed.

[0004] For example, Patent Document 1 discloses a method for cleaning and regenerating wood by spraying an alkaline chemical solution on the wood to decompose the dirt, spraying water, sucking while peeling the dirt with a brush, then infiltrating a foaming cleaning solution into the wood for bleaching, and applying a varnish to protect the surface.

[0005] In Patent Document 1, the object of cleaning and regeneration is a wooden floor, and this wooden floor is considered to be a solid wood material (single board) rather than a laminated wood (plywood). A solid wood material is a board cut from a single piece of wood, and generally has a thickness sufficient to maintain the strength required for the board. For example, even a solid wood material such as a floor board that does not require high strength has a thickness of approximately 5 mm or more.

[0006] On the one hand, laminated wood (plywood) is a material made by stacking multiple thin boards with a thickness of about 1 to 3 mm to have thickness and strength in the stacking direction. Since solid wood is cut from a single piece of wood, it is not easy to obtain wood of a desired shape. In contrast, with laminated wood, it is possible to collect woods that cannot be cut out as solid wood and form them into a desired shape. For this reason, laminated wood is easy to mass-produce and is generally less expensive than solid wood.

[0007] However, the thin boards that make up laminated wood are generally as thin as about 2 mm, and the thin boards may peel off from each other during the long-term use of laminated wood. Therefore, laminated wood is not suitable for long-term use. On the other hand, wood obtained from mature trees (for example, trees with an age of about 50 years or more) has a service life longer than the tree age if used appropriately. For this reason, a wooden building made of wood such as solid wood with a long service life can be regenerated by removing the stain of the wood and extended in service life.

[0008] The aforementioned "scrubbing" is a method that has been conventionally used as a method for removing stains on wood. "Scrubbing" usually involves applying a liquid such as a chemical solution, a bleaching solution, or a rinsing solution to wood using a tool that can hold and apply the liquid, such as a brush, a brush, or a cloth.

[0009] The floor cleaning and regeneration method disclosed in Patent Document 1 is positioned as a type of "scrubbing" that has a "stain removal" step of peeling off surface stains and a "bleaching (bleaching)" step of discharging and bleaching stains inside the wood. Patent Document 1 does not disclose a specific method of spraying a chemical solution for alkaline stain removal, but it is described that water is sprayed after spraying the chemical solution and slid with a rotating brush, and the chemical solution and water are poured onto the wooden floor and then a brush is used.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0011] When washing the wood, by using tools such as brushes, even for cohesive chemicals or viscous chemicals as disclosed in Patent Document 1, it is possible to penetrate not only in the surface direction of the wood but also into the interior (thickness direction) of the wood while spreading. On the other hand, when applying a chemical solution to the surface to be cleaned of the object to be cleaned while directly contacting a solid such as a brush or a brush with the object to be cleaned, the surface to be cleaned where the chemical solution has penetrated and become brittle may be scratched by the solid tool. Especially when the object to be cleaned is wood, the wood grain (the part to be regenerated) that is not originally the object to be removed may swell with the cleaning liquid and the swollen wood grain may be scratched and become fluffy by the solid tool or by being touched by hand.

Means for Solving the Problems

[0012] In order to prevent fluffing in the washing of wood, the inventor considered the first problem of not touching the surface to be cleaned with a solid tool and came up with the present invention. In the present invention, the liquid used for washing is atomized and sprayed onto the object to be cleaned, and the atomized liquid is moved by the wind in both the surface direction and the thickness direction of the surface to be cleaned to solve the above problems.

[0013] The present invention is a member that constitutes a structure for which long-term use is desired. The member is soiled by being exposed to dust, dirt, wind and rain, ultraviolet rays, mold, and other causes of soiling (soiling sources) over a long period of time, and it is required to remove the soiling and be regenerated. Here, in this specification, "long-term" means a period of a plurality of units with 10 years as a unit, meaning at least 10 years or more, generally 30 years or more.

[0014] The present invention is typically applied to various structures that are used for a long time while being maintained, such as houses, temples, shrines, and bridges, and is also applicable to smaller-scale structures and movable structures (such as ships, furniture, and portable shrines) and their members. The members constituting the structure have a strength and thickness that allow them to be regenerated by removing dirt even if dirt occurs on the surface and to be used for a long time. Specifically, the member has a thickness of about 5 mm or more, particularly a thickness of 1 cm or more as a member, and the material is not limited.

[0015] A suitable material is wood, but in addition, it can also be applied to members for structures molded mainly from inorganic substances (molded products such as bricks, concrete, mortar, and plaster), and members for structures made of metal or resin. Also, "having a thickness of about 5 mm or more as a member" means including a member having a thickness of about 5 mm or more as a member by stacking a plurality of materials whose thickness as a single material is less than about 5 mm, such as laminated wood. For example, a member in which a thin plate with a good appearance is attached to the surface of a member with strength but poor appearance (such as solid wood or gypsum board) so that the overall thickness is 5 mm or more is not excluded as an object to be treated in the present invention.

[0016] The present invention is used to remove dirt from members that have been exposed to dirt sources for a long period of 10 years or more after construction and have accumulated dirt. Examples of dirt include dust, grime, soot, grease, deterioration due to wind, rain, and ultraviolet rays, and dirt derived from organisms such as slugs and mold. The dirt includes that adhering to the surface of the member (hereinafter referred to as "adhering dirt") and that penetrating in the thickness direction (direction intersecting the plane direction) of the member (hereinafter referred to as "penetrating dirt"). The present invention can be suitably used to remove both, similar to Patent Document 1. In this specification, the surface of the member means a surface that extends in a direction intersecting the thickness (depth) direction of the member and means the surface exposed to the dirt source.

[0017] As the liquid used in the present invention, there are a chemical solution for removing adherent dirt (hereinafter, when particularly distinguished, referred to as "dissolution solution"), a chemical solution for bleaching penetrating dirt (hereinafter, when particularly distinguished, referred to as "bleaching solution"), a chemical solution for neutralizing acidic or alkaline chemical solutions (hereinafter, when particularly distinguished, referred to as "neutralization solution"), and a "rinse solution" for flushing away the chemical solution. However, there are also chemical solutions such as hydrogen peroxide and alkaline solutions that decompose adherent dirt and at the same time have a bleaching effect or a neutralizing effect. For this reason, in this specification, when it is necessary to distinguish and specify the action of the chemical solution, terms such as dissolution solution, bleaching solution, and neutralization solution are used. However, when it is not necessary to distinguish the action of the chemical solution, the chemical solution for removing stains is generically referred to as "cleaning solution", and the liquid used for rinsing is generically referred to as "rinse solution".

[0018] The cleaning solution used in the present invention is a liquid having an action of decomposing dirt by chemically reacting with the dirt and dissolving the dirt substance in the liquid (typically, alkaline water formed by dissolving an alkaline substance such as baking soda). It preferably contains a surfactant. The surfactant may be at a concentration of about 1 to 10%. By adding a surfactant to the cleaning solution, the atomized cleaning solution can easily penetrate and move in the thickness direction and the direction in which the surface spreads (surface direction) of the surface of the member to be treated, and the cleaning effect can be enhanced.

[0019] The method according to one aspect of the present invention atomizes the aforementioned chemical solution, sprays it onto the surface of the member with wind, and moves the atomized liquid in the surface direction and the thickness direction of the member by the force of the wind. The chemical solution is made into a mist having an average particle size of generally 100 μm or less in radius (that is, generally the size of fine rain). The chemical solution is preferably atomized to have an average particle size of less than 100 μm, that is, in the range of several tens of μm (for example, about 20 to 80 μm). Since it is preferable that the average particle size of the mist particles in the case of atomization is smaller, there is no lower limit, but if it is in the range of several tens of μm, the scattering into the air can be suppressed, so it is suitable for work in an unenclosed space (that is, an open space).

[0020] The atomized liquid is preferably blown onto the surface of the component with wind at a speed of 1 m / s or more, preferably 3 m / s or more. The wind for blowing and moving the atomized liquid is preferably about 4 to 10 m / s on the surface of the component. The atomized cleaning liquid has small particle size and good mobility, so it moves in the surface direction and thickness direction of the treated component, exerting high cleaning power. For this reason, a cleaning liquid with a weaker cleaning power than the cleaning liquid used for general scum washing can be used, and the amount of cleaning liquid used can also be reduced.

[0021] For example, the amount of cleaning solution used is 1 to 50 g / m2 on the surface of the structure. 2 degree, especially 3 to 20 g / m 2 The cleaning solution is atomized and blown at a speed of 3 to 6 m / s, reaching a distance of 1 m 2 It is recommended to spray about 5 to 15 g of product on an area of ​​about 100 mm for about 5 to 15 seconds with a wind volume of about 100%.

[0022] It is preferable to provide a rinsing process in which the cleaning liquid is washed away with a rinsing liquid after the cleaning process in which the cleaning liquid is atomized and sprayed. In the rinsing process, it is preferable to atomize the rinsing liquid and spray it onto the surface of the component in the same manner as in the cleaning process. In addition, an intermediate process may be provided between the cleaning process and the rinsing process in which a chemical liquid such as a neutralizing liquid for neutralizing the cleaning liquid or a bleaching liquid is sprayed onto the surface of the component. In the intermediate process, it is preferable to atomize the chemical liquid and spray it onto the surface of the component in the same manner as in the cleaning process.

[0023] Furthermore, a liquid flowing process may be provided in which, after the atomized liquid is sprayed onto the surface of the component, only wind not containing mist is sprayed onto the surface of the component. The liquid flowing process may be provided after either or both of the cleaning process and the intermediate process in which the liquid is sprayed onto the surface of the component. In the liquid flowing process, the liquid adhering to the surface of the component is caused to penetrate into the component by the force of the wind, while the excess liquid is moved in the direction of the force pulling the liquid (usually gravity). By providing such a liquid flowing process, the amount of liquid required for use in the next process can be reduced by removing the excess liquid from the surface of the component while causing the chemical solution to penetrate in the thickness direction of the component.

[0024] As one embodiment of the present invention, if all steps from the cleaning step to the rinsing step are performed by atomizing a liquid and spraying it onto the surface of the member, only the atomized cleaning liquid and air (gas), which are fluids, will touch the surface of the member to be treated, enabling non-contact cleaning without touching the surface of the member with a solid tool such as a brush or bristle or an individual such as a hand. Further, if a plurality of types of liquids such as a cleaning liquid and a rinsing liquid are held in different tanks and a spraying device that can switch the liquid supplied from the tank and atomized is used, in each step from the cleaning step to the rinsing step, the process can be changed only by switching the liquid, reducing the labor and time required for process change.

Effects of the Invention

[0025] According to the present invention, for a structure with aged dirt, the dirt can be removed while suppressing damage such as fuzzing when removing the dirt. According to the invention, since it is possible to avoid contact between the surface of the structure and a solid object such as a hand or a brush, even a person who is not accustomed to handling a structure with aged dirt can reduce the risk of the treated member, which has become brittle with the cleaning liquid, being damaged by a solid object during construction.

[0026] Further, according to the present invention, since the cleaning liquid is atomized and blown onto the treated member in the thickness direction and the surface direction with air, the cleaning liquid can penetrate into the treated member to enhance the cleaning power, and the amount of cleaning liquid used can be reduced. Furthermore, since even a cleaning liquid with weak cleaning power can exhibit good cleaning power, a low-irritation cleaning liquid with a lower chemical concentration and chemical reactivity than the cleaning liquid used for conventional degreasing can be used. By using a low-irritation cleaning liquid, the load of waste liquid treatment can be reduced and the safety of the cleaning operation can be enhanced.

[0027] In addition, in the present invention, by using a spray gun, which was conventionally considered unsuitable for delicate work such as degreasing, the working time can be accelerated, and it becomes easier to have a person without the technology of conventional degreasing perform the cleaning work of the member.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0029] Hereinafter, the present invention will be described in detail with reference to the drawings.

[0030] FIG. 1 is a schematic diagram of a cleaning device 1 used for cleaning members of a structure according to an embodiment of the present invention. The device 1 includes a spray gun 10, a plurality of liquid tanks 20, gas supply pipes 31, 32, and a liquid supply pipe 50. In the present embodiment, as the gas supply pipes, an air hose 31 for supplying gas to the spray gun 10 and an air delivery hose 32 for sending out gas from the spray gun 10 are connected to the spray gun 10. One end of the air hose 31 is connected to a blower device (not shown), and the other end is connected to the gas supply port 13 of the spray gun 10. One end of the air delivery hose 32 is connected to the air delivery port 14 provided in the spray gun 10, and the other end branches to form a plurality of branch hoses 32a, 32b, and each branch hose 32a, 32b is connected to a plurality of liquid tanks 20a, 20b, respectively.

[0031] In addition to the gas supply port 13 and the air delivery port 14, the spray gun 10 is provided with a liquid supply port 15, a spray port 11, and a spray lever 12. The gas supply port 14 is connected to a blower device (such as a compressor) not shown via the air hose 31 which is a gas supply pipe, and the gas (typically air) sent out from the blower device is supplied into the spray gun 10 through the air hose 31 and the gas supply port 13. Also, in the present embodiment, the gas sent into the spray gun 10 is discharged from the air delivery port 14 and sent to the liquid tank 20 from the air delivery hose 32 which is a gas supply pipe. The liquid tank 20 of the present embodiment is configured to be sealable, and when gas is sent from the air delivery hose 32, the internal pressure increases, and the liquid held in the liquid tank 20 is sent into the spray gun 10 from the liquid supply port 15 through the liquid supply pipe 40.

[0032] The liquid sent into the interior of the spray gun 10 is atomized by the gas sent into the interior of the spray gun 10 and ejected from the ejection port 11. The spray lever 12 provided on the spray gun 10 of the present embodiment is configured to be able to adjust the ejection strength of the fluid ejected from the ejection port 11 according to the position of pulling the lever. Specifically, when the lever is pulled shallowly, only gas is ejected, and the deeper the lever is pulled, the more gas can be ejected (the higher the wind speed). When the lever is pulled to the middle position, it is configured to switch between a gas ejection mode in which only gas is ejected and a mist ejection mode in which the atomized liquid and gas are ejected. In the mist ejection mode, the atomized liquid is configured to be ejected together with the wind. Also in the mist ejection mode, the deeper the lever is pulled, the more mist and wind can be ejected (the larger the amount of fluid sprayed and the higher the speed).

[0033] The air hose 31 of this spray gun 10 is thicker than that of a general spray gun for painting, so a large amount of gas (air) can be sent from the compressor to the spray gun 10. Specifically, in the case of a general spray gun, the thickness of the air hose is generally 1 cm or less in diameter, whereas the air hose 31 of the spray gun 10 according to the present embodiment has a diameter of about 2 cm and exceeds 1 cm in diameter. This spray gun 10 supplies 2000 L of air per minute to the interior of the spray gun 10 at a pressure (original pressure) of about 0.02 to 0.04 Mpa, ejects gas and liquid in the vicinity of the ejection port 11 to atomize the liquid, and sends out the atomized liquid from the ejection port 11 together with the wind.

[0034] Further, in the present embodiment, the air supply hose 32 connected to the air supply port 14 branches into a plurality of branch hoses 32a, 32b. The plurality of branch hoses 32a, 32b are respectively connected to any one of the plurality of liquid tanks 20a, 20b. Further, a flow rate adjustment valve 21 is provided in each of the plurality of branch hoses 32a, 32b. The flow rate adjustment valve 21 adjusts the flow rate of the fluid (gas in this embodiment) supplied to the liquid tanks 20a and 20b to which the plurality of branch hoses 32a and 32b are respectively connected.

[0035] Typically, by opening the flow control valve 21, the liquid in the liquid tank connected to the branched hose with the valve opened is sent to the spray gun 10, and when the valve is closed, the supply of the liquid from the liquid tank connected to the branched hose provided with the closed valve stops. Thus, the flow control valve 21 constitutes a switching mechanism for determining and switching which liquid held in which liquid tank is sent to the spray gun 10 among a plurality of liquid tanks. The flow control valve 21 is configured to be able to adjust the flow rate of the liquid sent from the liquid tank to the spray gun 10 by adjusting the flow rate of the gas sent to the liquid tank.

[0036] One end of the liquid supply pipe 50 is connected to the liquid supply port 15 of the spray gun 10. The liquid supply pipe 50 has one end connected to the liquid supply port 15, while the other end branches into a plurality of branch pipes 50a, 50b in the same manner as the air supply hose 32, and each branch pipe 50a, 50b is connected to a plurality of liquid tanks 20a, 20b, respectively.

[0037] Next, Example 1 of cleaning a member according to an embodiment of the present invention using the above-described device 1 will be described. The object to be cleaned in Example 1 is a member of a structure in which aged dirt has accumulated in the thickness direction, and it is a wooden door with a depth (thickness in the thickness direction) of about 3 cm. The door has a design in which cylinders with a diameter of about 2 mm are arranged continuously. The door has turned black due to being exposed to pollution sources such as dust during the 20 or more years since it was manufactured and installed in the building.

[0038] In Example 1, a cleaning step using an alkaline cleaning liquid, an intermediate step of neutralizing the cleaning liquid and bleaching the member to be treated, and a rinsing step of flushing the chemical liquid with water as a rinsing liquid were performed in this order. In Example 1, since three types of liquids were used, three liquid tanks 20 were provided, the air supply hose 32 and the liquid supply pipe 50 were branched into three, and the three branched hoses and branch pipes after branching were connected to each of the three liquid tanks. Also, three flow control valves for controlling the flow rate of each of the three branched hoses were provided so that the desired liquid could be switched and supplied from the three liquid tanks to the spray gun 10.

[0039] In Example 1, an alkaline chemical solution with a pH of 12 containing 1.5% by weight of sodium hydroxide and 5% by weight of a surfactant as the main components was used as the cleaning liquid. The flow rate adjustment valve of the branch hose 20a of the first liquid tank 20a holding the cleaning liquid was opened, and the cleaning liquid was supplied as the first liquid from the liquid tank 20a to the spray gun 10. Further, compressed air was sent from the air compressor to the air hose 31 to the spray gun 10 at 2000 L per minute and an original pressure of 0.04 MPa, atomized so as to have a mist shape with a D50 of about 50 μm, and ejected from the spray port 11 and sprayed onto the member to be processed.

[0040] In this embodiment, when the atomized liquid sent out from the spray gun 10 reached the surface of the door which was the member to be processed, the wind speed was about 4 to 5 m / s. The door was leaned against in the open space of the workplace, and by moving the spray gun 10 in the vertical, horizontal, and left - right directions of the leaned - against door, the atomized liquid carried by the wind from the spray gun 10 wetted the surface of the door, diffused in the thickness direction and the surface direction, and also entered between cylinders of about 2 mm. In Example 1, the atomized liquid was sprayed for about 7 to 10 seconds per square meter, and the amount of liquid used at that time was about 5 to 15 g. 2 At this time, the amount of the liquid used was about 5 to 15 g.

[0041] In this example, after this cleaning step, a first liquid flowing step of blowing only air from the spray gun 10 onto the member to be processed was carried out. In the liquid flowing step, by operating the spray lever 12 of the spray gun 10, only air was sprayed from the spray port 11 at a wind speed of about 4 to 5 m / s for about 5 to 8 seconds onto a surface with an area of about 1 square meter. In this example, since the door was leaned against and processed in the open space, the liquid penetrated in the thickness direction of the member in the liquid flowing step, and the excess liquid was pulled by the force that pulled the liquid (gravity in this example) and moved in the direction from top (ceiling) to bottom (floor). 2 In this example, since the door was leaned against and processed in the open space, the liquid penetrated in the thickness direction of the member in the liquid flowing step, and the excess liquid was pulled by the force that pulled the liquid (gravity in this example) and moved in the direction from top (ceiling) to bottom (floor).

[0042] After this first liquid flow process, the flow rate adjustment valve of the branch hose (first branch hose) 20a connected to the liquid tank (first liquid tank) 20a that holds the cleaning liquid was closed, and the flow rate adjustment valve of the branch hose (second branch hose) 20b connected to the liquid tank (second liquid tank) 20b that holds the neutralizing liquid was opened. As the neutralizing liquid, a liquid containing 2% by weight of citric acid and having a pH of 2 was used, and the liquid was atomized and sprayed onto the door in the same manner as in the cleaning process.

[0043] After the intermediate process, again, the above-described liquid flow process (second liquid flow process) was performed. After performing the second liquid flow process, the flow rate adjustment valve of the second branch hose 20b connected to the second liquid tank 20b that holds the neutralizing liquid was closed, and the flow rate adjustment valve (not shown) of the branch hose (third branch hose not shown) connected to the liquid tank (third liquid tank not shown) that holds water as the rinse liquid was opened, and water was atomized and sprayed onto the door in the same manner as in the cleaning process.

[0044] The liquid tank of the equipment 1 used in Example 1 was held so that an operator could hold it around the waist with a tank holding belt (not shown). As a result, the operator who cleans the surface of the member could determine the liquid to be atomized in the cleaning process, the intermediate process, and the rinsing process by operating the flow rate adjustment valve near the liquid tank to open and close it. For this reason, the operator could switch the above processes only by opening and closing the flow rate adjustment valve. Also, between the cleaning process and the rinsing process, the operator did not touch the door with his or her hands or tools (such as cloths and brushes) for the cleaning treatment.

[0045] Note that generally, the surface of a member of a soiled structure is ground or polished with solid tools such as planes, sandpapers, and polishers, or if it is a fluid, it is cleaned with a liquid (typically high-pressure water). Also, the spray gun used to atomize and spray the liquid in the present invention is generally used for painting and not for cleaning dirt. This is because the atomized liquid ejected from the spray gun is considered to have a lower cleaning power than the high-pressure jet liquid generally used for cleaning dirt.

[0046] Here, in a general spray gun 2 used for painting, as shown in FIG. 2, a liquid tank 20 is attached to a spray gun 60 via a liquid supply port 15. And, by the force of gas (air) sent into the spray gun 60 from an air compressor (not shown) via an air hose 31 and a gas supply port 13, the liquid supplied from the liquid tank 20 is ejected from an ejection port 11.

[0047] In the present invention, such a general spray gun is modified to have the above-described configuration, thereby reducing the time and effort required to switch between steps of a multi-step process for treating the surface of a soiled member at high speed. Further, a chemical solution for removing soiling is atomized by a spray gun and sprayed onto the surface of the soiled member with a wind having a wind speed exceeding 1 m / s, thereby suppressing the risk that the member to be cleaned is damaged by the cleaning operation. For this reason, according to the present invention, even an operator without skilled skills can perform a high-speed operation with reduced damage to a member of a structure that is soiled and requires delicate handling during a cleaning operation. Further, according to the present invention, by reducing the strength and amount of use of the chemical solution used for removing soiling, the safety of the operation can be enhanced, and at the same time, the load of waste liquid treatment and the procurement cost of the chemical solution can be reduced.

[0048] In particular, in the present invention, a large amount of gas (air) of 2000 L or more per minute is sent into the spray gun and ejected from the ejection port to atomize a liquid, and the atomized liquid is sent out from the ejection port at a wind speed of 3 m / s or more using a wind supplied in a large volume of 1000 L to 3000 L per minute and sprayed onto the member to be treated. Thereby, while allowing the cleaning liquid to penetrate into minute irregularities (for example, in mm units) in the thickness direction of the member to be treated, it can be spread also in the surface direction, and a high cleaning effect can be obtained with a small amount of the liquid used. In particular, by including a surfactant in the cleaning liquid, a high cleaning effect can be achieved even when the chemical reactivity of the cleaning liquid is lowered (that is, the safety is increased).

Claims

1. A method for cleaning a thick component constituting a structure, the surface of which has been exposed to a contamination source over a period of years, causing contamination to accumulate in the thickness direction of the component, comprising the steps of: The cleaning liquid for removing the stains is atomized to an average particle size of less than 100 μm using gas supplied at a pressure of 1000 L or more per minute and 0.04 MPa or less, and the supplied gas is used to atomize the cleaning liquid to a surface of the component at a density of 1 to 50 g / m ２ and then blowing the cleaning solution onto the surface of the component in an amount sufficient to wet the surface, and then blowing the cleaning solution onto the component in a thickness direction and in a direction extending over the surface of the component. A surface treatment method for a structure, in which the surface is cleaned in a non-contact manner without touching it with a solid.

2. After the washing step, 2. The method for treating a surface of a structure according to claim 1, further comprising a liquid flowing step of blowing wind at a speed of 3 m / s or more against the surface of the member to move the liquid adhering to the member.

3. The cleaning liquid is an alkaline liquid that breaks down the stains through a chemical reaction, and contains a surfactant.

2. The surface treatment method for a structure according to claim 1, further comprising an intermediate step, after the cleaning step, of atomizing an acidic liquid which neutralizes the cleaning solution and bleaches the component, and spraying the atomized liquid onto the surface of the component using wind to wet the surface with the acidic liquid, and using wind to cause the liquid to penetrate into the component in the thickness direction and also to flow in the direction spreading over the surface.

4. 4. The surface treatment method for a structure according to claim 1, further comprising, after the cleaning step, a rinsing step in which a rinsing liquid for washing away the cleaning liquid is atomized and sprayed onto the surface of the component by using wind to wet the surface with the rinsing liquid, and the rinsing liquid is caused to penetrate into the component in a thickness direction and to flow in a direction spreading over the surface by using wind.

5. An apparatus for cleaning a thick component constituting a structure, the surface of which has been exposed to a contamination source for a period of years, and which has accumulated contamination in the thickness direction of the component, a spray gun having a liquid supply port, a gas supply port through which gas is supplied at a pressure of 1000 L or more per minute and 0.04 MPa or less, a spray nozzle which atomizes the liquid supplied from the liquid supply port together with the gas supplied from the gas supply port to an average particle size of less than 100 μm and sprays the liquid using a wind of the supplied gas, and a spray lever which can switch between a gas ejection mode in which only the gas supplied from the gas supply port is sprayed from the spray port and a mist ejection mode in which the atomized liquid and gas are sprayed from the spray port; a liquid supply pipe connected to the liquid supply port, the liquid supply pipe having a plurality of branch pipes connected to a plurality of liquid tanks each holding a liquid to be supplied to the liquid supply port; a switching mechanism for switching the liquid to be supplied to the liquid supply port to any one of a plurality of types of liquid held in the plurality of liquid tanks, A first liquid held in a first liquid tank, which is one of the plurality of liquid tanks, is supplied from the liquid supply pipe to the spray gun, and the liquid is atomized and sent out with wind to be applied to the surface of the member at a concentration of 1 to 50 g / m ２ A first step of spraying the paint in an amount of and a second process of supplying a second liquid held in a second liquid tank that holds a second liquid different from the first liquid from the liquid supply pipe to the spray gun, atomizing the liquid, and sending the atomized liquid out with wind to be sprayed onto the surface of the component, the device being capable of performing the steps by operating the switching mechanism.

6. 6. The device according to claim 5, wherein the spray lever is configured so that the amount of gas to be sprayed and the degree of mist emission can be adjusted by operating the lever.

Images