JPH09109029A - Structure surface grinding/polishing/cleaning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve adhesive strength at the time of bonding a reinforcing steel plate to the surface of a structure through a resin adhesive. SOLUTION: A worker gets into a car gondola 53 and moves by operating a crane 52 to bring a nozzle head 27 into contact with the concrete wall surface. Grinding/polishing/cleaning material in a tank is fed to a jet nozzle of a nozzle head 27 through a blast hose 28 by clean compressed air obtained through an air cleaner 44 for separating and eliminating oil and steam from compressed air fed to a receiver tank 43 from a compressor 42, and the grinding/polishing/ cleaning material is jetted to the concrete wall surface from the jet nozzle 31 to grind/polish/clean the concrete wall surface. The surface layer and soil of the concrete wall surface taken off by the mutual collision of grinding/ polishing/cleaning material are sucked to a recovery tank through the blast hose 28 and separated and classified into reusable grinding/polishing/cleaning material, dust, and the like. The dust and the like are collected and dumped, and the reusable grinding/polishing/cleaning material is reused for the grinding/ polishing/cleaning of the concrete wall surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a metal structure such as steel such as ships, oil tanks, (giant) chimneys, bridges, pools, etc. It relates to a system for cleaning the floor surface, wall surface or ceiling surface of a structure, and other external surfaces. For example, for the cleaning of floors and outer surfaces of steel structures, etc., various vehicles such as ships, automobiles, trains, inner and outer surfaces of pontoons, etc., inner and outer surfaces of various tanks, (giant) chimneys, etc. It is used for external surface cleaning and cleaning of bridges, pools, water tanks, etc. Examples of bridge cleaning include steel deck slab cleaning. In addition to cleaning the floor surface of non-ferrous structures,
There are anti-slip treatments to improve safety, pre-coating treatments to recreate aesthetics, washout methods for naturalizing treatments, and jointing treatments (thickening) of old and new concrete.

Regarding the purpose of increasing the thickness of old and new concrete, the total vehicle weight of 20 tons has been reduced to 25 tons in accordance with a Cabinet Order which partially amends the Road Structure Ordinance. Along with this, it was pointed out that the strength of many existing bridges on the road was insufficient, and there was an urgent need to improve the bridges, including elevated roads. Therefore, the floor slab top surface thickening method is adopted. That is, the asphalt of the existing concrete bridge is removed, the upper surface of the concrete floor slab is cut, and then the surface is cleaned to expose a clean and sound concrete surface suitable for the joint surface.

In addition, as a method for cleaning concrete surface,
Since the piers of elevated roads in the Kobe area were destroyed in the Great Hanshin Earthquake, other existing piers constructed under the same building standards as or less than the destroyed piers will be prepared for future major earthquakes. There is an urgent need for reinforcement. As an example of the reinforcement measures for this pier, steel plates or carbon fiber plate materials are wound around the entire circumference of the concrete pier by multiple layers with a resin adhesive and bonded, or concrete is further added to the pier periphery by 20 to 50 cm.
There is a method of pouring and reinforcing it through a frame. In this case, in order to improve the adhesive strength of the resin adhesive or new concrete, it is necessary to clean the concrete wall surface of the pier and make it satin-finished and then bond the above steel plates.

It should be noted that cleaning concrete wall surfaces is not limited to the above earthquake countermeasures for bridge piers. For example, when the concrete wall surface of a reinforced concrete building is painted or the wall material is sprayed, the coating force of the paint or the adhesive force of the wall material is used. It is also an important factor in improving.

[0005]

2. Description of the Related Art Conventionally, there are a physical method and a chemical method as a surface treatment method for preventing corrosion or repair of a steel or non-ferrous structure. The physical methods include a shot blast method, a sand blast method and a water jet method. There are mechanical methods such as wire brush, jet chiseling, pick hammer, and machine cutting. on the other hand,
Chemical methods include acid-etching.

In order to explain the above-mentioned conventional surface treatment of a structure, a conventional polishing system for a structure having a concrete wall surface will be described as an example.

[0007] First, an operator has used a sander of a grinding tool to physically scrape off dirt and deposits (referred to as "dust and the like" in this specification) on the concrete wall surface.

As another example, the abrasive material is poured into an impeller rotating at a high speed by a shot blast consisting of a mechanical accelerator using an impeller or a distributor, and 70 to 90 m is generated by the centrifugal force of the impeller.
The "shot blasting method" has been performed in which high-speed projection is performed on a concrete wall surface at an arbitrary initial speed of / sec, and the energy is used to cut or crush / peel the adhered material on the concrete wall surface. As the abrasive, a steel shot or a steel grid having a particle size of 0.5 to 2.0 mm is mainly used. The abrasive cleaning material passes through an abrasive cleaning material projection chamber equipped with an abrasive cleaning material projection opening, is projected from the abrasive cleaning material projection opening onto a concrete wall surface, and then bounces off with repulsive energy, and at the same time passes through a conduit into the abrasive cleaning material projection chamber. Due to the suction force of the dust collector that communicates with each other, it is sucked into the separator tank together with the peeled substances through the conduit and collected. The collected abrasives and exfoliated materials are classified into reusable abrasives and exfoliated materials, dust, etc. in the separator tank by weight selection and air separation. Dust and the like is collected and stored in the dust collector. On the other hand, the abrasive material stored in the hopper below the separator tank is continuously re-projected. By moving the above shot blasting device to the concrete wall surface, the concrete wall surface is continuously cleaned. With the partial revision of the Road Structure Ordinance mentioned above, a blasting method using steel shot has been adopted in order to reveal a clean and sound concrete surface suitable for a joint surface. Moreover, regarding bridge repair and reinforcement including overpasses, the Highway Public Corporation issued a "floor slab top surface thickening method manual" to clarify the importance of shot blasting and increase the steel shot projection amount to 150 kg / m ² . It is prescribed.

Further, as another example, an operator sprays high-pressure water of, for example, 2500 kg / cm ² onto a concrete wall surface from a nozzle at the tip of the high-pressure water supply hose, and the spray pressure of the high-pressure water stains or stains the concrete wall surface. It was to remove the kimono.

For example, it is a structure in which an engine type or electric motor type plunger pump is operated, and the hydraulic pressure is used to obtain ultrahigh pressure water by an amplifying device. The structure includes a power source, a pump, a control unit, and an ultrahigh pressure water. There is an ultra-high pressure water blast system consisting of high pressure piping, a gun unit with a diamond or titanium nozzle head, etc.

Further, as another example, a special water-soluble medium such as baking soda (sodium bicarbonate) is used, and water is mixed in an injection nozzle provided at the tip of a hose for supplying the special water-soluble medium, and a special air pressure is used. An aqueous solution of water-soluble media is jetted from a jet nozzle onto a concrete wall surface with low water pressure, and if the special water-soluble medium is baking soda, the washing power of weak alkaline (PH8.2) of sodium bicarbonate and the jetting pressure of low-pressure water are applied to the concrete wall surface. It was to remove the dirt and deposits of the.

Further, conventionally, the surface of the structure has been coated or coated with a resin, and for example, a concrete wall surface of a pier may be coated or coated with a resin having a thickness of 2 to 3 mm for reinforcement. . In order to remove these resin coating films and coating films, the surface treatment of the above-mentioned chemical method has been performed.

[0013]

The conventional blasting and cleaning system for structures has the following problems, taking the blasting and cleaning system for concrete wall surfaces as an example.

In a concrete wall blasting system using a sander, the work efficiency is poor, and the grindstone of the grinding tool is significantly worn, so that it must be frequently replaced.
Further, since the working period is long, the working cost is high.

In the blasting and cleaning system for concrete wall surfaces by shot blasting, there is a problem that steel shots are clogged in the recesses of the concrete wall surface because the blasting and cleaning material is a steel grid. Therefore, it is desirable to use alumina as the abrasive cleaning material as a solution to the problem that the abrasive cleaning material is clogged in the recesses of the concrete wall as described above, but with the abrasive cleaning material of alumina, the impeller is worn out. Therefore, shot blasting cannot use alumina.

Since a large amount of high-pressure water is used in the concrete wall blasting and cleaning system using high-pressure water, the surface layer of the concrete wall is peeled off due to the high water pressure, and dust is scattered around the environment, and the environment around the workplace is There was a problem that the adverse effect of Furthermore, since the concrete wall surface becomes brittle due to the injection of high water pressure, there is a problem that the adhesive force between the steel plate and the concrete wall surface is reduced and the steel plate is separated from the concrete wall surface.

In a concrete wall scouring system using a low water pressure and an aqueous solution of sodium bicarbonate (sodium bicarbonate), there is a problem that the cleaning ability is very weak.

Further, the resin coating film or coating film on the concrete wall surface is poor in workability by conventional surface treatment by scientific methods, lacks safety, and the coating film cannot be easily peeled off. There was a problem that collection was difficult.

The present invention was developed to solve the above-mentioned problems, and it is possible to easily and efficiently grind the surface of a structure made of a steel structure or a non-ferrous structure to improve the repair performance. The purpose of the invention is to provide a blasting system by air blasting that is also capable of efficiently blasting the concrete wall surface of piers of elevated roads or structures such as reinforced concrete buildings, which is extremely difficult to work with in the past.
We also provide an air blasting and cleaning system for concrete wall surfaces that can improve the adhesive force of resin adhesives and the coating force of paints, and the resin coating film or coating film on the surface of the structure can be easily removed with dust etc. The purpose is to provide a polishing system capable of peeling.

[0020]

In order to achieve the above-mentioned object, the system of the present invention is designed so that a polishing / cleaning material is sprayed on the surface of a structure by air blasting to carry out polishing / cleaning, and the polishing / cleaning material is collected and classified. A system for blasting the surface of a structure by re-injecting the collected blasting and cleaning material, in which a work vehicle is provided with a blast hose and a vacuum hose, and a nozzle head is provided at the tip of the blast hose and the vacuum hose. Type blasting device main body, compressed air supply means, receiver tank, air cleaner, and a generator serving as an operating power supply for each device are mounted, and the work vehicle is moved to the vicinity of a structure to move the nozzle head. The compressed air supplied from the compressed air supply means is applied to the surface of the structure, the oil in the compressed air is separated and stored in the receiver tank, and the compressed air supplied from the receiver tank is stored. The clean and compressed oil is obtained by cooling, condensing and separating the oil and water vapor in the compressed air with an cleaner, and the clean compressed air is used to clean the abrasive from the tank that stores the abrasive through the blast hose. A tank that collects the blasting material and dust after the blasting, by sending the blasting material placed on the gondola and jetting it to the surface of the structure from the jet nozzle of the nozzle head at the tip of the blast hose. The cleaning and cleaning material in the recovery tank is separated and dust is collected and classified to collect dust and the like, while the cleaning and cleaning material in the recovery tank is again passed through the blast hose from the injection nozzle to the structure surface. A structure cleaning system that sprays and cleans the surface of the structure.

Further, the structure is a ship, an oil tank,
(Huge) Chimneys, bridges, steel structures such as pools, or non-ferrous structures such as asphalt, tiles, stones and concrete.

In the case of working at a high place of the above structure, an aerial work vehicle equipped with a crane having a gondola at its tip, the air blast device body, and compressed air supply means,
A blaster equipped with a receiver tank, an air cleaner, and a generator that serves as an operating power source for each of the devices, operates the crane of the aerial work vehicle, moves the gondola to the vicinity of the structure surface, and arranges the gondola in the gondola. The nozzle head at the tip of the hose can be applied to the surface of the structure, and a blasting material can be jetted from the jet nozzle of the nozzle head onto the surface of the structure for blasting.

In the present invention, instead of the gondola, a table lift for raising and lowering a work table on which an operator rides is moved to the vicinity of a concrete wall surface, and a blast hose and a vacuum hose are provided and arranged on the blast hose and the work table. And a compressed air supply means, a receiver tank, an air cleaner, and a generator that serves as an operating power source for each device. Therefore, it can be applied to the wall surface of a building such as a high-rise building.

In the above invention, the blast space is formed by abutting the concrete wall surface with the opening surface of the nozzle head which shields the periphery of the injection nozzle and has an opening at the front in the direction of the abrasive cleaning agent injection. The blasting material is sprayed from the blast hose to the concrete wall surface through the blast hose to be blasted, and the blasting material and dust after jetting are sucked into the collection tank via the vacuum hose to be collected. including.

The blasting device body includes a direct pressure type or gravity type blasting device.

Further, the system of the present invention includes a system in which a plurality of the blasting device bodies are mounted on an automobile and the same number of cranes or table lifts as the number of the blasting device bodies are provided.

Further, it is preferable to use alumina as the polishing agent.

Further, when the structure is coated or resin-coated on its surface, a cleaning agent made of resin, preferably thermosetting resin such as melamine and urea resin is coated or resin-coated. It is preferable that the surface of the applied structure is jetted and cleaned.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION In the polishing system for a surface of a structure according to the present invention, the structure to be subjected to the cleaning and sweeping is
(Huge) Steel structures such as chimneys, bridges, pools, etc., or structures made of various non-ferrous structures such as asphalt, tiles, stones, concrete, etc. The floor surface, wall surface or ceiling surface of this structure is cleaned and cleaned. It is a thing. An embodiment will be described below in which a high-rise concrete wall surface is used as a structure to be subjected to the scouring treatment.

An automobile equipped with a crane 52 having a gondola 53 for a worker at its tip, that is, an aerial work vehicle, is sprayed with a blasting material by air blast on the concrete wall surface to be blasted, and the blasting is performed. An air-type blasting device main body 10 for collecting and classifying cleaning material, dust, etc., a generator 41 serving as a power source for operating each device of the blasting and cleaning system of the present invention, and a compression for supplying compressed air to the blasting device main body 10. A compressor 42 serving as an air supply source, a receiver tank 43 that stores compressed air supplied from the compressor 42 and separates oil in the compressed air, and separates oil vapor and water vapor of the compressed air supplied from the receiver tank 43. , An air cleaner 44 for removal to obtain clean, preferably dry compressed air
And mounted.

Then, the aerial work vehicle travels and stops near the high-rise concrete wall surface to be ground and cleaned. A nozzle having a blast hose 28 having a length reaching the gondola 53 at the tip of the crane 52 from the polishing / cleaning material tank 24 or the recovery tank 17 and an injection nozzle 31 provided at the tip of the blast hose 28 in the blast device body 10. Head 27
A length of about 15 m with an inner diameter of 65 mm from the nozzle head 27 to the recovery tank 17, and a negative pressure is generated in the vacuum hose 29 and the recovery tank 17 and the recovery tank 17 A dust collector 11 for collecting dust and the like classified in 17 is mounted.

The operator boards the gondola 53 and operates the crane 52 to move to, for example, an elevated road or a portion of the concrete wall of the pier of the track to be cleaned, and the nozzle head 27
To the concrete wall surface to operate the blasting device main body 10. The compressed air supplied from the compressor 42 is passed through the receiver tank 43 and the air cleaner 44, and the compressed air having a clean pressure of 4.5 to 6.0 kg / cm ² is used to carry out the polishing and cleaning in the polishing and cleaning material tank 24 or the recovery tank 17. Material, preferably a particle size of 1.0 to 1.5 mm, more preferably 1.0 to 1.5 mm
For example, 1.2 mm of alumina is fed to the injection nozzle 31 of the nozzle head 27 through the blast hose 28, and the abrasive is supplied from the injection nozzle 31 to the concrete wall surface, preferably at an injection distance of 50 to 200 mm. Spray and clean. The surface cleaning agent and the surface layer of the concrete wall surface that has been peeled off due to the collision of the abrasive cleaning material with the concrete wall surface are sucked from the nozzle head 27 to the recovery tank 17 through the blast hose 28 and can be reused in the recovery tank 17. The cleaning material and dust are separated and classified, and the dust is collected by the dust collector 11, while the reusable cleaning material stays in the recovery tank 17 and is reused for cleaning the concrete wall surface. System.

In addition, the blasting and cleaning system of the present invention is provided with a table lift provided with an elevating device for elevating a table on which an operator rides, and the air blast device body 10 described above, a generator 41, and a compressor. It is also possible to use an automobile capable of mounting 42, the receiver tank 43, and the air cleaner 44, for example, a 2-ton long-body truck 51. In this case, a simple truck without a crane will do. However, an aerial work vehicle equipped with a crane 52 having a gondola 53 at its tip is desirable in terms of improving the efficiency of the scouring work.

Further, one or a plurality of cranes 52 can be provided, and the same number of blasting machine main bodies 10 as the number of cranes 52 can be provided, so that workability and work efficiency are good, and therefore, an aerial work vehicle. It is desirable to provide two cranes 52, 52, one each on the left and right in the traveling direction of 51.

Further, as the cleaning agent, alumina (Al ₂ O ₃ ),
Carborundum, river sand, silica sand, emery and the like can be used, but alumina (Al ₂ O ₃ ) is particularly preferable from the viewpoints of being economical and having high scouring ability.

When the surface of the structure is coated with a resin or a coating, the surface of the structure coated with the resin or a resin is preferably a thermosetting resin such as melamine and urea resin. By spraying the cleaning agent of thermosetting resin, the resin coating film or coating film on the surface of the structure is easily separated together with dust and the like. Since the specific gravity of the resin abrasive material is smaller than that of alundum, steel grid, etc., the injection speed becomes high and the collision energy becomes large. Therefore, it is considered that the resin coating film and the coating film surface are heated to facilitate the peeling. Further, as in the present invention, the nozzle head 27 that shields the periphery of the spray nozzle 31 and has an opening in the front in the abrasive cleaning agent spray direction has a high spray density of the abrasive cleaning material, so that a coating film can be formed efficiently. It is peeled off together with dust.

When the resin cleaning film of the present invention is used to polish the resin coating film or coating surface on the surface of the structure using the cleaning material of the resin, if the cleaned surface is clean, it is the final step. . However, when the deposits still remain on the polished surface, it is desirable to further spray alumina on the surface of the structure with the polishing system of the present invention as a polishing agent to remove the residual deposits. Therefore, when a resin coating or coating is applied to the surface of the structure, the blasting treatment using the blasting material of the resin can be used as the pretreatment step depending on the state of the blasting surface.

Further, the blasting device main body 10 may be an air type direct pressure type or a gravity type. In the case of the direct pressure type blasting device main body 10, a recovery tank 17 is provided at the upper part, and a polishing / cleaning material tank 24 is connected to the lower part of the recovery tank 17 via an openable / closable dump valve 25, and at the lower end of the polishing / cleaning material tank 24. One end of the blast hose 28 is connected via the abrasive cleaning material adjuster 26. Clean compressed air from the compressor 42 and the air cleaner 44 is supplied from one end of the polishing / cleaning material tank 24 and the blast hose 28, and the polishing / cleaning material in the polishing / cleaning material tank 24 is pressure-fed to the injection nozzle 31 at the tip of the blast hose 28. Then, the spray nozzle 31 sprays toward the concrete wall surface for scouring.

In the case of the gravity type blasting device main body 10, one end of a blast hose 28 is connected to the lower end of the recovery tank 17 via a polishing / cleaning material adjuster 26 and compressed to the injection nozzle 31 communicating with the other end of the blast hose 28. By supplying clean compressed air from the compressor 42 and the air cleaner 44 via the air supply pipe, the compressed air causes a negative pressure in the blast hose 28, and the abrasive material in the recovery tank 17 is sucked and sent. It is supplied and mixed with the compressed air, and is sprayed from the spray nozzle 31 toward the concrete wall surface for blasting.

Further, the nozzle head 27 is provided with the jet nozzle 31.
Is surrounded by a shield 33 having an opening in front of the abrasive cleaning agent in the jetting direction, and a vacuum hose 29 is communicated with a position behind the shield 33 in the abrasive jetting direction.
The opening surface of 3 is pressed against the concrete wall surface, and the concrete wall surface and the shield 33 form a blast space. A ring brush 32 is provided all around the opening edge of the shield 33 in order to improve the conformity between the opening surface of the shield 33 and the concrete wall surface and the mobility of the nozzle head 27, and the tip of the ring brush 32 is provided. Can be pressed against a concrete wall to form a blast space.

Further, the compressor 42 may be of the engine direct connection type or a motor driven screw type or rotary type, and is not particularly limited.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure surface cleaning system of the present invention will be described below with reference to the drawings. The target structure for the cleaning treatment in this embodiment is a pier of an elevated road and a high-rise concrete wall surface.

As shown in FIG. 1, 2 ton is used in this embodiment.
The long-body aerial work vehicle 51 is equipped with two air blasting device bodies 10, a generator 41, an engine-driven compressor 42, a receiver tank 43, and an air cleaner 44. Further, cranes 52, 52 are provided on the platform of the aerial work vehicle 51 so that the cranes 52, 52 can be vertically and horizontally moved and adjusted respectively in the forward and leftward directions of the aerial work vehicle 51. The tip of each crane 52 is equipped with a gondola 53, and an operator on the gondola 53 operates an operation switch at hand to operate the crane 52 to move and adjust the gondola 53 vertically and horizontally. The horizontal working radius of the crane 52 of this embodiment is 13 m.

The generator 41 is a power source for each device and is driven by a diesel engine to generate electric power of output 25 KVA, and this electric current rotationally drives the exhaust fan 15 provided in the dust collector 11 of the blasting device main body 10 described later. Each device such as a motor, a solenoid valve 20 for opening / closing the dump valve 25 between the recovery tank 17 and the polishing / cleaning material tank 24, and a motor for rotationally driving the cooling fan of the air cleaner 44 are driven (FIG. 4).

The compressor 42 is the blast device body 1
It is a compressed air supply means for supplying compressed air to 0. In this embodiment, the diesel engine has a rated output of 35 PS.
Then, the male and female screws that are axially supported so as to mesh with each other and gradually compress the air are rotationally driven to deliver a discharge pressure of 4.5 to 6.0 kg / cm ² (however, in the present embodiment, 6.
A screw compressor is used to obtain compressed air of 0 kg / cm ² .

The receiver tank 43 separates and stores the compressed air supplied from the compressor 42 and the oil component in the compressed air. In the compressor 42, the lubricating oil used to smooth the rotation of the male and female screws described above becomes oil vapor and is contained in the compressed air. Therefore, this compressed air is provided in the receiver tank 43. The oil vapor passes through the plurality of partition plates and collides with the partition plates to cause dew condensation and drop. Further, at the outlet of the compressed air discharged from the receiver tank 43, the oil is separated from the compressed air by being filtered by a filter. . However, the compressed air in the receiver tank 43 still contains oil vapor and water vapor.

The air cleaner 44 is preferably an aftercooler 45 and an air dryer 4 as shown in FIG.
6 and equipment such as an oil mist filter 47. The compressed air supplied from the receiver tank 43 is preferably cooled to some extent in the aftercooler 45 and then precooled in the heat exchanger 48 of the air dryer 46 with the cold air from the cooling chamber 49 so that the steam in the compressed air is cooled. And oil vapor condenses. The compressed air precooled by the heat exchanger 48 flows into the cooling chamber 49 and is rapidly cooled, and the oil and steam are further condensed. Both condensed water and oil are discharged from the auto drain. On the other hand, the compressed air rapidly cooled in the cooling chamber 49 passes through the heat exchanger 48 again and is heated to a temperature close to room temperature by heat exchange with the compressed air cooled to a certain degree from the aftercooler 45, Obtain dry, clean compressed air. The dried and clean compressed air more preferably passes through the oil mist filter 47 to be further oil-removed and highly clean compressed air (clean air) is supplied. The above air cleaner 41 is an example,
It is not limited to this. For example, the oil mist filter 4
7, only the aftercooler 45 and the air dryer 46, or only the air dryer 46 and the oil mist filter 47 may be used. Further, the air dryer 46 is not limited to the structure described above.

In this embodiment, the blasting device main body 10 is an air type direct pressure type blasting device main body. This will be described below with reference to the drawings. Alternatively, an air-type and gravity-type blasting device main body may be used.

In FIG. 3, the blasting device main body 10 is a collection tank 17 made of a cyclone for separating and classifying the abrasive and cleaning material and dust, and a polishing valve for pressure-feeding the abrasive and cleaning material via a dump valve 25 below the recovery tank 17. A polishing / cleaning material tank 24 is provided, and the lower end of the polishing / cleaning material tank 24 communicates with a blast hose 28 via a polishing / cleaning material adjuster 26. The blast hose 28 has a diameter of about 19 mm and a length of about 20 m. The nozzle head 27 is provided at the tip of the blast hose 28.
The operator who has boarded the gondola 53 has the nozzle head 27
Hold and clean the concrete wall. The ability of the blasting device body 10 to feed the abrasive cleaning material is changed according to the height of the concrete wall surface, and the length of the blast hose 28 depends on the ability of the blasting device body 10 to deliver the abrasive cleaning material. For example, it can be set to 10 m or 20 m.

The nozzle head 27 is provided with an injection nozzle 31 at the tip of the blast hose 28 as shown in FIG.
The injection nozzle 31 is surrounded by a shield 33 in the form of a curved surface having an opening with a diameter of about 60 mm in front of the abrasive cleaning material in the injection direction,
A ring brush 32 in which a brush having a height of about 20 mm is formed in a ring shape is provided all around the opening edge of the shield 33, and the tip end surface of the ring brush 32 is pressed against a concrete wall surface,
The concrete wall surface, the ring brush 32, and the shield 33 form a blast space. The abrasive cleaning material jet distance is the distance from the tip of the jet nozzle 31 to the tip of the ring brush 32.

One end of a vacuum hose 29 having an inner diameter of 65 mm and a length of about 15 m is connected to a rear position of the shield 33 in the direction of jetting the cleaning agent to communicate with the blast space, and the other end of the vacuum hose 29 is collected. It communicates with the upper side wall surface of the tank 17. The inner diameter and the length of the vacuum hose 29 can be changed as needed.
A length of 0 mm can be about 5 m. Recovery tank 1
One end of the pipe 16 is communicated with the center of the upper wall surface of the pipe 7, and the other end of the pipe 16 is communicated with the dust collector 11. Dust collector 1
A dust box 13 for accumulating dust and the like is provided at the bottom of the device 1, and the dust box 13 is provided so as to be taken out in order to discard the dust and the like. An air exhauster 15 is provided above the dust collector 11. The air exhauster 15 is supplied with current from the generator 41 and is rotated by a motor (not shown) which is a rotation driving means, and the dust collector 1
1. Since the inside of the recovery tank 17 and the vacuum hose 29 is made negative pressure, an air flow is generated in order from the inside of the blast space in the shield 33 to the vacuum hose 29, the recovery tank 17, the pipe 16, and the dust collector 11. The nozzle head 27 is provided with a hand switch for controlling the blasting device. In FIG. 3, reference numeral 14 is a switch box, which incorporates various switches, and 19 is a foreign matter filter,
The foreign matter larger than the polishing and cleaning material that has flowed into the recovery tank 17 is collected.

In this embodiment, alumina (Al ₂ O ₃ ) is charged into the recovery tank 17 of the blasting apparatus main body 10 as a cleaning agent. Other materials such as carborundum, river sand, silica sand, and emery can be used as the cleaning agent.
₂ O ₃ ) is economical and has a high cleaning capability. The cost of carborundum is high. Ring brush 3 of nozzle head 27
When the tip surface of 2 is pressed against the concrete wall surface and the hand switch is activated, the solenoid valve 20 is activated and the abrasive cleaning material tank 2
The dump valve 25 in 4 rises and the communication between the recovery tank 17 and the abrasive cleaning material tank 24 is cut off. At the same time, 6 kg / cm ² of clean compressed air obtained from the compressor 42 via the air cleaner 44 has already been sent into the polishing / cleaning material tank 24, so that the polishing / cleaning material tank 24 is filled with compressed air. The pressed abrasive and cleaning material in the abrasive and cleaning material tank 24 and compressed air enter into the abrasive and cleaning material adjuster 26 below the abrasive and cleaning material tank 24. Are mixed appropriately and are pressure-fed in the blast hose 28, and are sprayed to the concrete wall surface from the spray nozzle 31 to be ground and cleaned.

The blasting conditions of this example are summarized in Table 1.
become that way.

[0054]

[Table 1]

After the abrasive material collides with the concrete wall surface facing the blast space to remove the surface layer and dirt on the concrete wall surface, the debris on the concrete wall surface and the dust and the like of the damaged abrasive material etc. The usable polishing agent is sucked into the recovery tank 17 by the air flow in the vacuum hose 29, and the reusable polishing agent and dust are separated and classified in the recovery tank 17, and the polishing agent is Recovery tank 1
The dust and the like staying in the lower part of the No. 7 rise in the rising air flow in the center of the recovery tank 17 and are discharged from the pipe 16 to the dust collector 11
And is collected in the dust box 13 and clean air is discharged from the blower 15 into the atmosphere.

When the dump valve 25 is pushed down by operating the hand switch, the polishing / cleaning material tank 2
The compressed air in 4 escapes to the recovery tank 17, and immediately at this time, the jetting of the polishing and cleaning material stops and the inside of the polishing and cleaning material tank 24 becomes atmospheric pressure. At the same time, the polishing / cleaning material staying at the bottom of the recovery tank 17 immediately drops into the polishing / cleaning material tank 24.

When the solenoid valve 20 is actuated by operating the hand switch and the dump valve 25 in the polishing / cleaning material tank 24 is raised and the communication between the recovery tank 17 and the polishing / cleaning material tank 24 is cut off, the polishing / cleaning material tank 24 As described above, the abrasive material in the inside is pumped again in the blast hose 28 and jetted from the jet nozzle 31 of the nozzle head 27.

As described above, the worker mounts the gondola 53 of the crane 52, moves the nozzle head 27 while pressing the nozzle head 27 against the concrete wall surface, and advances the concrete wall surface cleaning work.

In this embodiment, the piers 60 of the elevated road 62 are erected in parallel in two rows at predetermined intervals in the longitudinal direction of the elevated road 62 (FIG. 2). Figure 1 shows the cross section of the pier 60 below the elevated road 62. One pier 60 is hollow with a rectangular cross section with a width of 0.9 m and a length of 4 m, and a height of about 5.1 m. The surface area is about 50 m ² . Many other bridge piers are hollow and have a circular cross section. Further, the bridge pier 60 is erected on the upper surface of the foundation 61 which is piled deep in the ground as shown in FIG.

An aerial work vehicle 51 equipped with the equipment constituting the blasting and cleaning system of the present invention is run between the parallel piers 60, 60, and stopped near the pier 60 to be blasted and cleaned. Cranes 52, 52 provided on the left and right of the work vehicle 51
A worker who rides on each of the gondolas 53, 53 of the above-mentioned gondola 53 on the right side in the traveling direction of the aerial work vehicle 51 is on the right side in the traveling direction of the aerial work vehicle 51 of the parallel piers 60, 60. The concrete wall surface of the bridge pier 60 is cleaned by the blasting device main body 10, while the worker who boarded the gondola 53 on the left side in the traveling direction of the aerial work vehicle 51, finds that the aerial work vehicle out of the parallel piers 60, 60. The concrete wall surface of the bridge pier 60 on the left side of the traveling direction of 51 is cleaned with the blasting device main body 10. In addition, as shown in FIG. 1, another aerial work vehicle 5
1, that is, using four cranes 52 and four blasting device main bodies 10 in total, the blasting work can be efficiently advanced from both side surfaces of each pier 60 at the same time.

In this embodiment, one blast device body 1
The blasting speed required for blasting the concrete wall surface of the pier of the elevated road at 0 is 4.8 to ¹² per 1 m ^{2 of} area.
Minutes. That is, a pier with a surface area of 50 m ² is 4.
It was possible to clean up in 0 to 10 hours.

Further, when a steel plate was adhered to the concrete wall surface cleaned in this example through an epoxy resin adhesive, the adhesive force was 15 to 40 kg / cm ² .

Table 2 below shows the results of comparison of the examples of the present invention with other polishing systems. In addition, in the column of evaluation, the adhesive force means that the concrete wall surface is blasted and cleaned by each blasting system, and then a steel plate is bonded to the concrete wall surface with an adhesive, and the adhesive force is compared. The polishing efficiency is a comparison of the polishing time required per unit area. Further, the secular change indicates whether or not the adhesive force has a secular change.

However, in the table, Δ indicates a little inferior.

[0065]

[Table 2]

The quality of the adhesive force between the steel plate and the concrete wall surface is the most important item for the purpose of reinforcing earthquake resistance, and Table 2 shows that the polishing system of the present application is the most excellent. Further, the blasting efficiency is excellent because the shot blasting is performed by the robot (automatic), and the high-pressure water is excellent because the injection pressure is high. The polishing / cleaning system of the present application is inferior in polishing / cleaning efficiency to these polishing / cleaning systems, but is superior to the sander.

From the above, the cleaning system of the present application is
It can be said that it is the best compared to other blasting systems for the purpose of seismic retrofitting of piers on elevated roads.

[Example of Paint Surface Polishing Treatment of Concrete Wall Surface] In the above-described polishing system of the present invention, a polishing material made of a thermosetting resin is used, and the above-mentioned polishing material is applied to a painted concrete wall surface. Was sprayed and the coating film was peeled off together with dust and the like.

Table 3 is a summary of the blast conditions of this example.
become that way.

[0070]

[Table 3]

Under the above-mentioned blasting conditions, the cleaning material is made of a thermosetting resin in which POLYPLUS and TYPE III are mixed under the trade name of US Technology Co., Ltd., Far, Yeast. However, the abrasive material is not limited to the particle size, hardness, material and the like shown in Table 3 above.

As a result, the cleaning processing capacity is 500 mm × 5
It was possible to peel off the coating film surface having a thickness of about 2 mm on the concrete wall surface of 00 mm in about 2 to 3 minutes. In this case, the coating film, the putty as the lower layer of the coating film, the primer as the lower layer, and the concrete surface layer were partially peeled off.

By the way, when the above-mentioned blasting treatment is carried out using an abrasive material such as alundum or steel grid, it takes 5 to 6 times as long as the abrasive material of the thermosetting resin of this embodiment. .

Since the abrasives such as alundum and steel grid have a large specific gravity, the injection speed does not increase, so that the collision energy of the abrasives is small. Therefore, it is considered that the collision energy of the abrasive material is absorbed by the coating film surface. On the other hand, since the specific gravity of the resin abrasive material is smaller than that of alundum, steel grid, etc., the injection speed at the time of injection from the injection nozzle becomes high, such as 180 m / sec. The collision energy of the cleaning material becomes large. Therefore, it is considered that the surface of the coating film is heated and peeled off easily. By the way, the specific gravity of the polishing and cleaning material of POLYPLUS is 1.15 to 1.25, the specific gravity of the polishing and cleaning material of TYPEPEIII is 1.47 to 1.52, and the specific gravity of the steel grid is 7.85.

Therefore, it is possible to remove the coating film together with the dust efficiently by using the resin cleaning agent and increasing the spraying density of the cleaning agent to perform the concentrated blasting. As in the present embodiment, the nozzle head 27 which shields the periphery of the spray nozzle 31 and has an opening in the front direction in the direction of spraying the cleaning / cleaning material can increase the spraying density of the cleaning / cleaning material and concentrate the coating film surface. It is effective because it will be blasted.

The method of using the resin abrasive material in the abrasive cleaning system of the present invention is as follows: the paint surface of the painted concrete wall surface is abraded by the resin abrasive material to remove the concrete after the abrasive cleaning. If the coating film on the wall surface is removed along with dust etc. and is clean, then the final step is performed.However, if the concrete wall surface is still dirty or adhered substances remain, clean the alumina cleaning agent as described above. It is desirable to jet and clean the concrete wall surface to clean the concrete wall surface. Therefore, the blasting treatment of the resin with the blasting agent can be used as the pretreatment step, and the blasting treatment with the other abrasive agent such as alumina can be used as the final step. Further, the polishing process using a resin cleaning material can be the final step depending on the clean state of the cleaning surface.

In the method of using the resin cleaning material in the cleaning system of the present invention, the coating film can be removed together with dust without removing the oxidized surface of the structure or the alclad of the aluminum plate. Moreover, since it does not cause scratches due to sanding, it was effective to remove the coating film of various aircraft such as automobiles and trains such as large buses, as well as the coating surface of aircraft. In this case, the coating film could be peeled off without changing the gel coat and the body filler.

[0078]

Since the present invention is configured as described above, it has the following effects.

(1) The structure surface blasting and cleaning system of the present invention is an air blast equipped with a work vehicle equipped with a blast hose for feeding the abrasive and cleaning material and a vacuum hose for collecting the abrasive and cleaning material and dust. Since the apparatus main body and the equipment for operating the blasting apparatus main body were mounted, it was possible to provide a polishing and cleaning system with high work efficiency because it was easy to move.

(2) The structure surface cleaning system of the present invention is an air type system equipped with a blast hose for feeding the cleaning material and a vacuum hose for collecting the cleaning material and dust to a vehicle with a crane. Equipped with a blasting device main body and equipment for operating the blasting device main body, it is easy to move, so work efficiency is good, and a crane or table lift is operated to clean the surface of the structure at a high position with a cleaning agent. As a result, the polishing and cleaning system with high polishing and cleaning efficiency could be provided.

(3) Alumina that is economical and has a large scouring ability
Since (Al ₂ O ₃ ) can be used, the shots can be clogged in the recesses of the concrete wall as in the conventional blasting system by shot blasting, or the concrete wall can be made fragile as in the blasting system by high pressure water. There is no change in adhesive strength over time. Therefore, it was possible to provide an effective scouring system that improves the adhesive strength of the resin adhesive.

(4) Dust and the like sprayed on the surface of the structure are sucked by a vacuum hose, and dust and the like classified by the recovery tank are collected by the dust collector, so that the dust and the like scatter around the site. Therefore, there is no environmental problem around the site like the conventional high-pressure water cleaning system.

(5) The resin coating film or coating film on the surface of the structure is removed by polishing the resin coating film or coating surface on the structure surface using the resin cleaning material of the present invention. It could be easily peeled off together with dust and the like.

[Brief description of the drawings]

FIG. 1 is a construction plan view of an embodiment in which a concrete wall surface of a pier of an elevated road is ground and cleaned using the grinding and cleaning system of the present invention.

FIG. 2 is a construction elevation view showing a part of FIG.

FIG. 3 shows an embodiment of the present invention, and is a detailed view of each device including a direct pressure type blasting device main body.

FIG. 4 is a flow chart diagram of the scouring system of the embodiment of the present invention.

[Explanation of symbols]

 10 Blasting device main body 11 Dust collector 13 Dust box 14 Switch box 15 Exhaust fan 16 Tube 17 Recovery tank 19 Foreign matter screen 20 Electromagnetic valve 24 Abrasive cleaning material tank 25 Dump valve 26 Abrasive cleaning material regulator 27 Nozzle head 28 Blast hose 29 Vacuum hose 31 Injection Nozzle 32 Ring Brush 33 Shield 41 Generator 42 Compressor 43 Receiver Tank 44 Air Cleaner 45 Aftercooler 46 Air Dryer 47 Oil Mist Filter 48 Heat Exchanger 49 Cooling Room 51 Aerial Work Vehicle 52 Crane 53 Gondola 60 Bridge Pier 61 Foundation 62 Overpass road

Claims (9)

[Claims] 1. A structure / cleaning material is sprayed by air blasting on the surface of a structure for cleaning and cleaning, the cleaning / cleaning material is collected and classified, and then the collected cleaning / cleaning material is sprayed again to clean the surface of the structure. In the system, a work vehicle is provided with a blast hose and a vacuum hose, and a blast hose and a vacuum hose are provided with a nozzle head at the tip of the blast hose, a compressed air supply means, a receiver tank, An air cleaner and a generator serving as an operating power source for each device are mounted, the work vehicle is moved to the vicinity of a structure, the nozzle head is applied to the surface of the structure, and the compressed air supplied from the compressed air supply means is supplied. The receiver tank separates and stores the oil in the compressed air, and the compressed air supplied from the receiver tank is cooled, condensed and separated by the air cleaner. Dry, clean compressed air is obtained, and the clean compressed air is fed from the tank that stores the abrasive cleaning material through the blast hose, and the nozzle head at the tip of the blast hose arranged in the gondola is The structure is sprayed from the spray nozzle onto the surface of the structure to be ground, and the ground cleaning material and dust after cleaning are sucked into the recovery tank via the vacuum hose, and the cleaning material and dust are separated in the recovery tank. The blasting and cleaning of the structure surface is characterized in that the blasting and cleaning material in the recovery tank is sprayed again from the injection nozzle to the surface of the structure through the blast hose to collect dust and the like. system. 2. A structure comprising a steel structure such as a ship, an oil tank, a huge chimney, a bridge, a pool or a non-ferrous structure such as asphalt, tile, stone material, concrete, etc., and a crane having a gondola at its tip. An aerial work vehicle equipped with the air-type blasting device main body, a compressed air supply means, a receiver tank, an air cleaner, and a generator serving as an operating power source for each of the equipment, The crane of the car is operated to move the gondola to the vicinity of the surface of the structure, and the nozzle head at the tip of the blast hose arranged in the gondola is applied to the surface of the structure, and the abrasive is sprayed from the injection nozzle of the nozzle head to the structure. The system for scouring and cleaning a surface of a structure according to claim 1, wherein the blasting and spraying is performed on the surface. 3. The work carried by a worker, wherein the structure is a steel structure such as a ship, an oil tank, a huge chimney, a bridge, a pool, or a non-ferrous structure such as various asphalt, tiles, stones, concrete, etc. A table lift that raises and lowers the table is moved to the vicinity of the structure, and the air type blasting device main body, compressed air supply means, receiver tank, air cleaner, and a generator that serves as an operating power supply for each device are mounted. The work vehicle is stopped near the structure, the work table of the table lift is moved up and down, the nozzle head is applied to the structure surface, and a cleaning agent is sprayed from the spray nozzle of the nozzle head onto the structure surface. Cleaned claim 1
A cleaning system for the surface of the described structure. 4. A blast space is formed by abutting the opening surface of a nozzle head that shields the periphery of an injection nozzle and has an opening in the front in the blasting / cleaning material injection direction, to form a blast space, and the blasting / cleaning is performed in this blast space. The material is sprayed from a spray nozzle onto a surface of a structure through a blast hose to be ground and cleaned, and the ground cleaning material and dust after spraying are sucked and collected into a recovery tank through a vacuum hose. 3. A polishing system for the surface of a structure according to 3. 5. Clean compressed air obtained from the compressed air supply means through a receiver tank and an air cleaner is supplied to a polishing / cleaning material tank for storing the polishing / cleaning material and a blast hose communicating with the lower end of the polishing / cleaning material tank. According to the above, a direct pressure blast method in which the abrasive cleaning material in the abrasive cleaning material tank is pressure-fed to the nozzle head through the blast hose to inject the abrasive cleaning material from the injection nozzle onto the surface of the structure to perform the abrasive cleaning. Item 1,
A polishing system for the surface of a structure according to 2, 3 or 4. 6. A clean compressed air obtained from the compressed air supply means through a receiver tank and an air cleaner is supplied to an injection nozzle of a nozzle head through a compressed air supply pipe, so that the injection nozzle and the lower end of the recovery tank are provided. It is a gravity-type blasting method in which a negative pressure is applied to the communicating blast hose to suck the abrasive material in the recovery tank to the injection nozzle, and the abrasive material is injected from the injection nozzle to the surface of the structure to perform abrasive cleaning. A cleaning system for the surface of a structure according to 1, 2, 3 or 4. 7. The structure surface polishing according to claim 1, wherein a plurality of the blasting device bodies are mounted on an automobile, and the same number of cranes or table lifts as the number of the blasting device bodies are provided. Sweeping system. 8. The polishing system for a surface of a structure according to claim 1, wherein the polishing agent is alumina or a thermosetting resin. 9. The polishing agent according to claim 1, wherein the polishing agent is made of resin, and the cleaning agent made of resin is sprayed onto the surface of a structure coated or coated with resin to perform cleaning. System for surface cleaning of structures.