JP7150767B2 - AIR BLAST JIG, RECOVERY OF Abrasive Material, AND AIR BLAST METHOD - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Date of issue: January 31, 2019 Publication (name of publication, number of volumes, number of issues, corresponding pages, place of issue/publisher, etc.) 15th oil and gas stockpiling business improvement Activity presentation program (page: p.57, publisher: Japan Oil, Gas and Metals National Corporation) [Publications, etc.] Date January 31, 2019 Meeting name, Venue 15th Petroleum・Oil gas stockpiling business improvement activity presentation (Toranomon Nissho Hall (Japan Fire Department 2nd floor))

TECHNICAL FIELD The present disclosure relates to an air blast jig, an abrasive cleaning material recovery device, and an air blast method.

In various factories, channels for conveying various fluids are constructed of tubular bodies or the like. For example, rainwater on the roof plate of a floating roof tank is transported and drained by a tubular body such as a roof drain (see Patent Document 1, for example). Contamination and corrosion progresses inside such a tubular body over time. For this reason, it is necessary to open it periodically and check whether maintenance is necessary. Air blasting may be used in such confirmation work. For example, Patent Literature 2 proposes a technique in which a nozzle of a sandblasting machine is brought into an inclined penstock and sand is sprayed on the inner wall to remove deposits such as dirt.

JP 2013-136399 A Japanese Patent Application Laid-Open No. 2007-30082

Nozzles that are fixed to structures are usually difficult to remove. When corrosive substances flow through such nozzles, it is necessary to periodically open the nozzles for inspection. During this inspection, it is necessary to clean the inner surface of the nozzle by air blasting in order to remove deposits. Here, if it is a nozzle that can be easily removed or disassembled, it is possible to carry it into an enclosed space and perform sandblasting. It is necessary to air blast while it is fixed. In such air blasting work, a large amount of abrasive material (for example, silica sand) is discharged to the work site, degrading the working environment. For this reason, other work cannot be done in parallel, and there is concern that the construction period will be lengthened.

Therefore, the present disclosure provides an air blasting jig and an abrasive cleaning material recovery device capable of improving the working environment when air blasting a nozzle fixed to a structure. In addition, the present disclosure provides an air blasting method capable of improving the working environment when air blasting a nozzle fixed to a structure.

An air blasting jig according to one aspect of the present disclosure is an air blasting jig for the inner surface of a nozzle fixed to a structure, and includes a cylindrical portion, and one end of the cylindrical portion is connected to one end side of the nozzle. A first jig having a connecting portion and an insertion opening into which a discharge pipe of a cleaning material from the air blasting device is inserted is provided at the other end of the cylindrical portion.

The air blasting jig is used for air blasting of a nozzle fixed to a structure. Since the air blasting jig has a cylindrical portion, an insertion port into which the abrasive discharge pipe is inserted, and a connecting portion connected to one end of the nozzle, the air blasting jig and the and the nozzle from flowing out to the outside. Therefore, by using the jig for air blasting, even if air blasting is performed while the jig is fixed to the structure, the outflow of the abrasive to the work site can be suppressed, and the work environment can be improved. can be done.

The jig for air blasting includes the first jig, a second jig having a connection portion connected to the other end of the nozzle, and a connection portion connected to a recovery portion for recovering the abrasive material. , may be provided.

In the air blast jig, the first jig is connected to one end of the nozzle, and the second jig is connected to the other end of the nozzle, so that the inner space of the nozzle can be closed. . The first jig has an insertion port into which the discharge pipe for the abrasive cleaning agent is inserted, and the second jig has a connecting portion to which the recovering portion for recovering the abrasive cleaning agent is connected, so that the abrasive cleaning agent is closed. Outflow to the outside of the space is suppressed. Therefore, by using the jig for air blasting, even if air blasting is performed while the jig is fixed to the structure, the outflow of the abrasive to the work site can be suppressed, and the work environment can be improved. can be done.

It is preferable that the recovery section has a first recovery section made of a material having air permeability and a second recovery section that sucks and recovers the abrasive material. Since the first collecting section is made of a material having air permeability, even if the amount of compressed air discharged from the air blasting device containing the abrasive is larger than the amount of compressed air sucked by the second absorbing section. , the surplus compressed air can be discharged from the first recovery section, so that the increase in pressure in the closed space can be suppressed. Since the second recovery section sucks and recovers the abrasive, it is possible to prevent the abrasive from staying inside the nozzle. Therefore, air blasting of the inner surface of the nozzle can be performed smoothly.

It is preferable that the second jig has a baffle plate that suppresses recovery of the abrasive material in the first recovery section. As a result, it is possible to maintain the air permeability of the air-permeable material constituting the first collecting portion and to efficiently collect the abrasive material in the second collecting portion.

The structure to which the nozzle is fixed may be the side plate or top plate of the tank. One end of the nozzle fixed to the side plate or top plate of the tank is provided inside the tank. Therefore, by using the above-described air blasting jig, it is possible to prevent the abrasive from flowing out into the tank when the inner surface of the nozzle is air blasted. This improves the working environment inside the tank, and makes it possible to perform work other than air blasting in parallel. Therefore, the open period of the tank can be shortened to reduce opportunity loss and maintenance costs.

The insertion opening in the first jig is preferably made of a polymer member. As a result, it is possible to improve the adhesion of the abrasive cleaning material from the air blast device to the discharge pipe inserted into the insertion opening, and to sufficiently suppress the abrasive cleaning material from flowing out from the gap between the discharge pipe and the insertion opening. .

A cleaning material recovery device according to an aspect of the present disclosure includes any one of the air blasting jigs described above and a recovery unit that recovers the cleaning material. Since such an abrasive cleaning material recovery device is provided with the above-described air blasting jig, the abrasive cleaning material is prevented from flowing out to the work site, and the work environment can be improved.

The abrasive recovery device is a device for recovering the abrasive when air blasting is performed on the inner surface of a nozzle fixed to a structure. a first jig having a connecting portion connected to one end side of the nozzle and an insertion port into which a discharge pipe of the abrasive cleaning material from the air blasting device is inserted at the other end of the cylindrical portion; and the other end side of the nozzle. and a recovery unit connected to the cleaning agent for recovering the abrasive.

In the recovery device, the first jig is connected to one end of the nozzle, and the recovery section is connected to the other end of the nozzle, so that the internal space of the nozzle can be closed. Therefore, the cleaning material from the air blast device inserted through the insertion opening of the jig on the one end side of the nozzle can be recovered by the recovery section connected to the other end side of the nozzle. Therefore, the abrasive is prevented from flowing out of the closed space. Such an abrasive cleaning material recovery device can suppress the abrasive cleaning material from flowing out to the work site, thereby improving the working environment.

An airblasting method according to one aspect of the present disclosure is a method of airblasting the inner surface of a nozzle using any of the above-described abrasive cleaning material recovery devices, wherein airblasting is performed by inserting a discharge pipe into the insertion port. and a step of collecting the sand discharged from the discharge pipe by a collecting unit. Since this air blasting method uses any one of the above-described abrasive recovery devices, it is possible to suppress the abrasive from flowing out to the work site during the air blasting operation, thereby improving the working environment. can.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide an air blasting jig and an abrasive cleaning material recovery device capable of improving the working environment when air blasting a nozzle fixed to a structure. In addition, the present disclosure can provide an air blasting method capable of improving the working environment when air blasting a nozzle fixed to a structure.

FIG. 1 is a perspective view showing an example of a first jig for air blasting. FIG. 2 is a side view showing an example of the second jig of the airblast jig. 3 is a view showing the inner surface side of the second jig shown in FIG. 2. FIG. FIG. 4 is a diagram showing an example of an abrasive cleaning material recovery device. FIG. 5 is a diagram showing an example of a tank equipped with a nozzle whose inner surface is cleaned by the air blast method.

An embodiment of the present disclosure will be described below with reference to the drawings as the case may be. However, the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following contents. In the description, the same reference numerals are used for the same elements or elements having the same function, and overlapping descriptions are omitted in some cases. Also, the dimensional ratio of each element is not limited to the illustrated ratio.

An air blast jig according to one embodiment is fixed to a structure and used for air blasting of the inner surface of a nozzle having flanges on both ends. This jig for air blasting includes a first jig connected to one end side of the nozzle and a second jig connected to the other end side of the nozzle. The first jig includes a cylindrical portion, a connecting portion connected to one flange of the nozzle on one end side of the cylindrical portion, and a discharge pipe for the abrasive cleaning material from the air blast device on the other end side of the cylindrical portion. and an insertion opening into which the is inserted. The second jig has a connecting portion connected to the other flange of the nozzle, and a connecting portion connected to a recovery portion for recovering the abrasive cleaning material.

FIG. 1 is a perspective view showing an example of a first jig for air blasting. The first jig 10 of FIG. 1 has a tubular portion 14 , a connecting portion 12 on one end side of the tubular portion 14 , and a ring-shaped cover portion 13 on the other end side of the tubular portion 14 . The connecting portion 12 may be joined to one end of the cylindrical portion 14 by welding or the like. The cover portion 13 may be joined to the other end of the cylindrical portion 14 by welding or the like. The connection part 12 may be configured by a flange, for example. That is, the first jig 10 and the nozzle whose inner surface is cleaned by air blasting may be flange-connected by the connecting portion 12 . In this way, it is possible to suppress the outflow of the abrasive to the outside.

A polymer member 16 having a circular through-hole forming an insertion port 18 is attached to the central portion of the cover portion 13 . The through-hole of the polymer member 16 is one size smaller than the through-hole 17 of the cover portion 13 and is provided concentrically with the through-hole 17 . Thereby, the inner edge of the insertion opening 18 is composed of the polymer member 16 . An insertion port 18 formed by the polymer member 16 is inserted with a discharge pipe through which the abrasive material is discharged from the air blast device. Since the insertion port 18 is made of a polymer member, the adhesion between the discharge pipe inserted into the insertion port 18 and the insertion port 18 is improved, and the abrasive material flows out from the gap between the discharge pipe and the insertion port 18. can be sufficiently suppressed. The inner diameter of the insertion port 18 may be, for example, 10-50 mm. The inner diameter of the through-hole 17 may be 1.2 to 3 times the inner diameter of the insertion port 18, or may be 1.5 to 2 times. The polymer member 16 is preferably made of an elastic material such as rubber from the viewpoint of improving adhesion to the discharge pipe.

The inner diameter of the tubular portion 14 may be 0.7 to 1.5 times, or 0.8 to 1.3 times, the inner diameter of the nozzle to be cleaned by air blasting. As a result, the abrasive discharged from the discharge port can collide with the inner surface of the nozzle with high accuracy. The inner diameter of the cylindrical portion 14 may be, for example, 50-800 mm, or 60-500 mm. The length of the cylindrical portion 14 may be, for example, 50-500 mm, or 100-400 mm. The inner diameter and length of the cylindrical portion 14 may be adjusted according to the inner diameter of the nozzle and the discharge capacity of the airblast device. The length of the cylindrical portion 14 can be adjusted by connecting, for example, two or more tubular bodies by welding or the like. The tubular portion 14 of the first jig 10 is formed by welding two tubular bodies with different inner diameters, but may be formed by one tubular body, or by welding three or more tubular bodies. good too. The first jig 10 may be produced using waste materials such as pipes and flanges.

FIG. 2 is a side view showing an example of the second jig of the airblast jig, and FIG. 3 is a diagram showing the inner surface side of the second jig in FIG. The second jig 20 includes a connection portion 22 connected to the other flange of the nozzle, a first connection portion 24a connected to a first recovery portion made of a material having air permeability, and a suction material. and a second connecting portion 26a to which a second collecting portion that collects by The connection part 22 may be configured by a flange, for example. That is, the second jig 20 and the nozzle may be flange-connected by the connecting portion 22 . As a result, it is possible to suppress the outflow of the abrasive to the outside.

The first connecting portion 24a has a straight tubular joint portion and an openable/closable valve 24v at its tip. The second connecting portion 26a has a joint portion and an elbow joint at its tip. The connecting portion 22, the first connecting portion 24a, and the second connecting portion 26a may be joined by welding or the like. The structures of the first connection portion 24a and the second connection portion 26a are not limited to the illustrated shapes, and any structure that allows connection between the first recovery portion and the second recovery portion may be used. For example, the first joint portion 24a and the second connection portion 26a may be composed only of straight tubular joint portions.

The connecting portion 22 of the second jig 20 is formed with two through holes 24b and 26b. The through hole 24b communicates with the flow path of the first connecting portion 24a, and the through hole 26b communicates with the flow path of the second connecting portion 26a. A baffle plate 27 covers the through hole 24b. However, since the baffle plate 27 is connected to the connecting portion 22 via the pair of support members 25a and 25b, the baffle plate 27 does not block the through hole 24b. By having the baffle plate 27 , the second jig 20 has the function of suppressing the recovery of the abrasive material to the first recovery section 24 and promoting the recovery of the abrasive material by the second recovery section 26 . Since there is a gap S between the support members 25a and 25b that support the baffle plate 27, the compressed air can flow through the gap S. Therefore, the compressed air in the nozzle 30 can flow into the first recovery section via the gap S and the first connecting section 24a.

The jig for air blasting of this embodiment comprises, as an example, a first jig 10 shown in FIG. 1 and a second jig 20 shown in FIGS. A first jig 10 is flange-connected by a connecting portion 12 to one end of a nozzle to be airblasted. The second jig 20 is flange-connected to the other end of the nozzle by a connecting portion 22 . If the inner surface of the nozzle is air-blasted with the first jig 10 and the second jig 20 attached to both ends of the nozzle, the abrasive material is prevented from flowing out. This can improve the working environment.

FIG. 4 is a diagram showing an example of an abrasive cleaning material recovery device. The abrasive cleaning material recovery device 100 includes an air blast jig 70 having a first jig 10 and a second jig 20 connected to both ends of a nozzle 30 whose inner surface 34 is air blasted and cleaned, and a second jig 70. 2. A first recovery part 24 and a second recovery part 26 attached to the jig 20 are provided. The first jig 10 is connected to a flange 31 on one end side of the nozzle 30 , and the second jig 20 is connected to a flange 32 on the other end side of the nozzle 30 .

Nozzle 30 is fixed to structure 50 by welding. Therefore, it is necessary to air-blast the inner surface 34 while it is fixed to the structure 50 . The structure 50 may be, for example, a side plate, a top plate, a bottom plate, or the like of a tank or container. The inner diameter of the nozzle 30 may be, for example, 50-800 mm, or 60-500 mm. The length of the nozzle 30 may be, for example, 200-1000 mm, or 300-800 mm. In addition, the nozzle whose inner surface is cleaned is not limited to a straight tube type, and may be, for example, an elbow type nozzle.

The connecting portion 12 of the first jig 10 is flange-connected to the flange 31 of the nozzle 30 . A discharge pipe 40 of an air blast device is inserted into the insertion port 18 of the first jig 10 . A normal commercial item can be used for the air blast device. Various media used for air blasting can be used as the abrasive. Examples thereof include metallic and non-metallic materials such as alumina particles, steel shots, steel, stainless steel beads, glass beads, and silica sand. Air blasting equipment may also be referred to as sand blasting equipment.

A cleaning material 42 discharged from a discharge pipe 40 inserted through the insertion port 18 collides with the inner surface of the nozzle 30 . In FIG. 4, the abrasive cleaning material 42 is drawn only in the vicinity of the ejection port of the ejection pipe 40 for the sake of explanation, but the abrasive cleaning material 42 actually spreads throughout the inside of the nozzle 30 . As a result, deposits such as dirt and rust adhering to the inner surface 34 of the nozzle 30 are removed. In order for the abrasive to collide with the entire inner surface 34 of the nozzle 30, the length of the tubular portion 14 of the first jig 10 may be adjusted, or the insertion length of the discharge pipe 40 may be adjusted. may be adjusted.

From the viewpoint of securing the degree of freedom in adjusting the discharge angle when discharging the abrasive cleaning material, the insertion length of the discharge pipe 40 should be less than 80% of the length of the cylindrical portion 14 of the first jig 10. is preferred, and less than 70% is more preferred. On the other hand, from the viewpoint of sufficiently suppressing the discharge pipe 40 from coming off the insertion port 18 during air blasting, the insertion length of the discharge pipe 40 is set to the length of the cylindrical portion 14 of the first jig 10. It is preferably 30% or more, more preferably 40% or more. A plurality of first jigs 10 having different inner diameters and lengths of the cylindrical portion 14 may be prepared, and the optimum first jig 10 may be selected according to the inner diameter and length of the nozzle 30. .

A recovery bag having air permeability is connected as the first recovery part 24 to the first connection part 24 a of the second jig 20 . The collection bag can collect the abrasive while ensuring air permeability. The dust collector 23 and the suction device 28 are connected in this order from the second connection portion 26a side to the second connection portion 26a of the second jig 20 as the second collection portion 26 . The second connection portion 26a and the dust collector 23, and the dust collector 23 and the suction device 28 are connected via hoses 29a and 29b, respectively. As a result, when the suction device 28 sucks compressed air, the compressed air sucked from the inside of the nozzle 30 flows through the second connection portion 26a, the hose 29a, the dust collector 23, and the hose 29b in this order, and then flows into the suction device 28. flow into

The collection bag, which is the first collection unit 24, may be, for example, a commercially available polyethylene or hemp bag (sandbag). The dust collector 23 may be, for example, a commercially available cyclone. The abrasive 44 separated from the compressed air by the dust collector 23 by, for example, centrifugal force is collected in the container 21 . The abrasive collected in the storage container 21 may be reused. Suction device 28 may be, for example, a commercially available vacuum cleaner.

Most of the abrasive material discharged from the discharge pipe 40 collides with the inner surface of the nozzle 30 and then is collected by the suction force of the suction device 28 into the container 21 of the second collecting section 26 . By providing the second recovery section 26 in this way, it is possible to suppress the retention of the cleaning material inside the nozzle 30 . On the other hand, in the first collecting section 24, while allowing the compressed air to pass through, a small amount of abrasive material accompanying the compressed air is collected. When the recovery bag used as the first recovery section 24 is filled with abrasive material, it is necessary to interrupt the air blasting operation in order to replace the recovery bag. However, in this example, most of the abrasive material is recovered by the second recovery section 26, so the frequency of replacement of the recovery bag can be reduced. Therefore, air blasting work can be performed continuously for a long time.

Since the abrasive cleaning material recovery device 100 includes the first recovery section 24 having air permeability, the amount of compressed air supplied from the discharge pipe 40 of the air blast device is larger than the amount of compressed air sucked by the suction device 28. Also, the abrasive can be recovered smoothly. The baffle plate 27 has the function of reducing the amount of abrasive material collected in the first collecting section 24 and promoting the collection of the abrasive material into the second collecting section 26 .

According to the abrasive cleaning material recovery device 100, it is possible to suppress the abrasive cleaning material from flowing out to the outside when air blasting the inner surface of the nozzle 30 is performed. For example, when the structure 50 is a tank, when the inner surface of the nozzle 30 is air-blasted, the inside of the tank (the right side of the structure 50 in FIG. 4) is conventionally filled with the abrasive, while the inside of the tank is could not do other work in parallel. For this reason, the air blasting work for the inner surface of the nozzle 30 has been a factor in prolonging the work period for maintenance of the tank. On the other hand, by using the cleaning material recovery device 100 having the first jig 10, the second jig 20, the first recovery section 24, and the second recovery section 26, the cleaning material can be prevented from flowing out into the tank. can be suppressed. This improves the working environment inside the tank so that other work can be done in parallel inside the tank. In addition, it is possible to improve the efficiency of collection and cleaning of the abrasive cleaning material. Therefore, it is possible to significantly shorten the work period for maintenance of the tank.

The air blasting method according to one embodiment can be performed, for example, using the abrasive cleaning material recovery device 100 of FIG. When performing this air blasting method, the opening work of the structure 50 is performed as needed. Then, the following preparatory steps are performed. First, the pipes and the like connected to the flanges 31 and 32 at both ends of the nozzle 30 are removed. After that, the connecting portion 12 of the first jig 10 and the flange 31 of the nozzle 30 are connected. Similarly, the connecting portion 22 of the second jig 20 and the flange 32 of the nozzle 30 are connected. A first recovery part 24 (for example, a sandbag) is attached to the tip of the first connection part 24a of the second jig 20, and a second recovery part 26 is attached to the tip of the second connection part 26a. The second collection unit 26 is manufactured by connecting a hose 29a, a dust collector 23, a hose 29b, and a suction device 28 in this order. Below the dust collector 23, a storage container 21 for collecting the abrasive material 44 is arranged.

After the above preparation step, a step of inserting the discharge pipe 40 into the insertion port 18 to carry out air blasting, and a step of collecting the abrasive discharged from the discharge pipe in the first collecting portion 24 and the second collecting portion 26. ,I do. According to this air blasting method, it is possible to suppress the outflow of the abrasive and improve the working environment. When the collection bag of the first collection unit 24 becomes full during the collecting step, the valve 24v may be closed and the collection bag may be replaced. Since the first collection unit 24 is provided with the valve 24v in this manner, air blasting can be continued even when the collection bag is replaced.

After the air blasting step and the abrasive cleaning step are finished, the first jig 10 and the second jig 20 are removed from the nozzle 30 to perform repair and corrosion prevention work.

FIG. 5 is a diagram showing an example of a tank having a nozzle whose inner surface is cleaned by the air blasting method of this embodiment. The tank 200 shown in FIG. 5 is a floating roof type outdoor storage tank (floating roof tank), and in the area defined by the side plate 51, the bottom plate 55 and the floating roof 60 (top plate), crude oil, fuel oil, or Store fluids such as chemicals. A floating chamber 61 called a pontoon is provided on the outer periphery of the floating roof 60 . Since the floating roof 60 floats on the fluid when the fluid is stored, loss due to evaporation of the fluid can be reduced.

Floating roof 60 has a drain box 62 (which may be a center sump) in which rainwater is collected. Rainwater collected in the drain box 62 flows in through the inflow pipe 64 , flows through the roof drain 65 , and is discharged outside through the outflow pipe 68 . A part of the channel for discharging rainwater from the floating roof 60 is composed of the nozzles 30 and 30A fixed to the side plate 51 and the floating roof 60 (drain box 62) which are structures. Since the nozzles 30 and 30A are fixed to the side plate 51 and the floating roof 60, which are structures, by welding or the like, they are not easy to remove.

Therefore, when the tank 200 is periodically opened, if the inner surfaces of the nozzles 30, 30A are air-blasted using the air-blasting jig according to the present embodiment, repair and corrosion protection of the nozzles 30, 30A can be easily performed. It can be carried out. In addition, it is possible to prevent deterioration of the working environment due to filling of the inside of the tank 200 with the abrasive. Therefore, the air blasting of the nozzles 30 and 30A and the internal inspection of the tank 200 can be performed in parallel, and the opening period of the tank 200 can be shortened.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. That is, the air blasting jig, the abrasive cleaning material recovery device, and the air blasting method are not limited to the above-described embodiments. For example, the abrasive recovery device 100 and the second jig 20 have a plurality of recovery parts, but in another embodiment, only one recovery part and one connection part connected to the recovery part are provided. It's okay. In this case, the recovery section may be only the first recovery section 24 described above, or may be only the second recovery section 26 . In this way, even if only the first recovery section 24 or the second recovery section 26 is used, the working environment can be improved by recovering the abrasive discharged from the discharge pipe. Also, the baffle plate 27 is not limited to the illustrated structure and may be changed as appropriate. Also, the baffle plate 27 may not be provided.

An air blasting jig and an abrasive material collecting device according to another embodiment includes a first jig 10 connected to one end of a nozzle 30 and an abrasive material collecting apparatus connected to the other end of the nozzle 30. and a collecting unit 24 for collecting. That is, this abrasive material recovery apparatus differs from the abrasive material recovery apparatus 100 described above in that the recovery portion 24 is directly connected to the other end of the nozzle 30 without the second jig 20 interposed therebetween. . The collection unit 24 is the same as the first collection unit 24 in the above embodiment, and can be made of, for example, a breathable collection bag or the like. Even with such an air blasting jig and abrasive recovery device, it is possible to improve the work environment when air blasting the nozzle 30 fixed to the structure 50 . The description of the above embodiment can also be appropriately applied to this embodiment. In addition, using this air blasting jig and the cleaning material collecting device, a step of inserting the discharge pipe 40 into the insertion port 18 and performing air blasting, and collecting the cleaning material 42 discharged from the discharge pipe 40 are carried out. and recovering in section 24 .

In either embodiment, the structures to which the nozzles are secured are not limited to tank side plates and floating roof 60, but may be other various devices and reservoirs.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide an air blasting jig and an abrasive cleaning material recovery device capable of improving the working environment when air blasting a nozzle fixed to a structure. In addition, the present disclosure can provide an air blasting method capable of improving the working environment when air blasting a nozzle fixed to a structure.

DESCRIPTION OF SYMBOLS 10... 1st jig|tool 12... Connection part 13... Cover part 14... Cylindrical part 16... Polymer member 17... Through hole 18... Insertion opening 20... Second jig 21... Container, 22... Connecting part 23... Dust collector 24... First collecting part (collecting part) 24a... First connecting part (connecting part) 24v... Valve 26... Second collecting part (collecting part) 26a... Second Connection portion (connection portion) 24b, 26b through hole 25a, 25b support member 27 baffle plate 28 suction machine 29a, 29b hose 30, 30A nozzle 31, 32 flange 34 Inner surface 40 Discharge pipe 42, 44 Abrasive material 50 Structure 51 Side plate 55 Bottom plate 60 Floating roof 61 Floating chamber 62 Drain box 64 Inflow pipe 65 ... Roof drain, 68 ... Lead-out pipe, 70 ... Air blast jig, 100 ... Recovery device, 200 ... Tank.

Claims (8)

An airblast jig for the inner surface of a nozzle fixed to a structure,
a cylindrical portion, a connecting portion connected to one end of the nozzle at one end of the cylindrical portion, and an insertion port into which a discharge pipe for a cleaning material from an air blasting device is inserted at the other end of the cylindrical portion; a first jig having
a first connecting portion connected to the other end side of the nozzle and having a first through hole and a second through hole; a first collecting portion made of a material having air permeability; a second jig having a second connecting portion to which a second collecting portion that collects the material by suction is connected ;
The jig for air blasting , wherein the first through-hole communicates with the flow path of the first connecting portion, and the second through-hole communicates with the flow path of the second connecting portion . 2. The jig for air blasting according to claim 1, wherein compressed air containing said abrasive cleaning material is discharged from said discharge pipe inserted into said insertion port. 3. The jig for air blasting according to claim 1 , wherein said first recovery part is a recovery bag made of a material having air permeability and for recovering said abrasive cleaning material. The air blasting jig according to any one of claims 1 to 3, wherein said second jig has a baffle plate for suppressing recovery of said abrasive material in said first recovery portion. The jig for air blasting according to any one of claims 1 to 4, wherein the structure is a side plate or top plate of a tank. The jig for air blasting according to any one of claims 1 to 5, wherein said insertion port is formed of a polymer member. An abrasive cleaning material recovery device comprising: the air blast jig according to any one of claims 1 to 6; and a recovery section for recovering the abrasive cleaning material. An air blasting method for air blasting the inner surface of the nozzle using the abrasive cleaning material recovery device according to claim 7,
a step of inserting the discharge pipe into the insertion opening and performing air blasting;
and collecting the abrasive discharged from the discharge pipe in the collecting section.

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