JP7156601B2 - Local anti-corrosion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a local anti-corrosion device, and more particularly to a local anti-corrosion device capable of locally repairing a portion where corrosion is progressing particularly in repair work of a bridge or the like.

Conventionally, I-shaped (H-shaped) and box-shaped steel materials have been favorably used for the main parts of bridges such as roads and railways (especially bridge girders) because of their excellent strength, workability, and economic efficiency. there is Such steel materials are mainly coated with resin (epoxy resin, fluororesin, etc.) paint to prevent corrosion (including rust prevention). etc.) may occur, and repair work is being carried out on a regular basis.

In such repair work after bridge construction, scaffolding formed from vertical and horizontal steel pipes and scaffolding boards is assembled under the main girder made of steel, and workers repair the steel materials of the bridge on these scaffolding boards. was going However, the construction of scaffolding for large bridges such as expressways and railways requires a large amount of scaffolding materials to be brought in at the site and many days for the assembly process, which lengthens the construction period of repair work and increases costs. be a factor.

For this reason, a scaffold installation method for bridge girder repair and painting work and a scaffolding device for bridge girder repair and painting work are disclosed, which make it possible to improve the installation efficiency of the work scaffold by suspending a working gondola between bridge girders. (See Patent Document 1.)

JP 2005-155015

According to the scaffolding device for bridge girder repair and painting work described in Patent Document 1, two gondola support wires are provided between the bridge piers, and a gondola for work is suspended from the gondola support wires and moved in the direction of the bridge axis. Therefore, the installation and dismantling time of the working scaffold can be greatly shortened. However, when performing local repair work on the steel material of a bridge, it is not necessary to secure a work place overall, and the work itself to suspend the gondola is a large-scale work.

In addition, when repairing steel materials for bridges, first, blasting is performed by spraying abrasives at high speed on the corroded parts of the surface of the steel materials to clean them. It is done by painting or metal spraying. At this time, a large amount of the abrasive sprayed on the corroded portion of the surface of the steel material by the blasting treatment and the rust and paint of the anti-corrosion portion peeled off by the abrasive are scattered. The paint that scatters may contain harmful substances (for example, lead, etc.), and for the safety of workers and the preservation of the surrounding environment, the blasting process should be sealed as much as possible to prevent the scattering of harmful substances. I had to.

In order to solve the above-mentioned problems, the present invention provides a structure that can be easily attached to and detached from the corroded portion of the steel material of the bridge without installing a large-scale scaffolding when performing local repair work on the steel material of the bridge, and furthermore, blasting. It is an object of the present invention to provide a local anti-corrosion device capable of completely enclosing a portion to be treated.

In order to achieve the above object, the present invention provides the following techniques.

The present invention comprises a box-shaped casing made of reinforced corrugated cardboard having an opening surface with one side open , and adjusting the flow rate of air supplied to the inside of the casing to the outer peripheral surface of the casing other than the opening surface. It has a possible air supply port, an arm insertion port, a blast hose insertion port, an observation window, and a vacuum hose connection port, and the opening surface can be attached to seal the corrosion part on the surface of the steel material. A local anti-corrosion device.

In addition, an absorbing sheet is attached to the inside of the housing for absorbing the impact of the abrasive in the blasting process.

In addition, a frame is attached so as to surround the corroded portion of the surface of the steel material, and the frame is covered with a light-transmitting sheet to form a closed rectangular parallelepiped internal space on the surface of the steel material. The local anti-corrosion device is characterized by comprising an air supply port capable of adjusting the flow rate of air supplied to the internal space, an arm insertion port, a blast hose insertion port, and a vacuum hose connection port.

The present invention comprises a box-shaped housing having an opening surface with one side open, and an air supply port, an arm insertion port, a blast hose insertion port, and an observation window on the outer peripheral surface of the housing other than the opening surface. , and a vacuum hose connection port, and is attached so as to seal a corroded portion on the surface of a steel material by the opening surface.

In this embodiment, when performing a blasting process to clean the corroded portion of the surface of the steel material in the repair work of the steel material constituting the bridge, first, the corroded portion of the surface of the steel material (rust, etc. occurs on the opening surface of the housing). A box-shaped main body is attached to the surface of the steel material so as to seal and cover the part where the Subsequently, the blast ejection hose is inserted into the housing through the blast hose insertion port, and the worker inserts one forearm into the housing through the arm insertion port. While confirming the corroded portion of the steel material through the observation window, the operator operates the blast ejection hose with one hand to blast the corroded portion. At this time, the high-speed abrasive ejected from the blast ejection hose and the large amount of rust and paint on the corroded parts that are peeled off and scattered from the surface of the steel material by this abrasive are removed from the vacuum hose connected to the vacuum hose connection port. It is discharged outside the housing.

With the above configuration, blasting can be performed in a sealed housing without scattering the high-speed abrasive ejected from the blast ejection hose or the rust and paint of the corroded portion peeled off by the abrasive. can. That is, when carrying out local bridge repair work, it is possible to provide a local anti-corrosion device that can be easily attached to and detached from the corroded portion of the steel material of the bridge and that can completely seal the portion to be blasted.

In addition, the housing is provided with an air supply port. This air supply port is for supplying air into the housing when performing blasting, and it is a round register with opening and closing blades that can manually adjust the flow rate of air supplied to the housing. is preferably used. An operator manually adjusts the blades of a round register with opening/closing blades as an air supply port to supply air into the enclosure while maintaining the negative pressure inside the sealed enclosure. As a result, it is possible to smoothly discharge, from the vacuum hose connected to the vacuum hose connection port, to the outside of the housing body, the abrasive, the rust of the corroded portion peeled off by the abrasive, the paint, and other fragments.

In addition, an absorbing sheet is attached to the inside of the housing to absorb the impact of the abrasive during blasting. As a material for the box-shaped housing of the present embodiment, for example, a lightweight material such as reinforced corrugated cardboard or a thin plate is preferably used. This is for the purpose of facilitating the sealing of the housing to the corroded portion of the steel material, but on the other hand, the lack of strength cannot be denied. In the blasting process, the abrasive ejected from the blast ejection hose moves at a considerably high speed, and the abrasive may damage the inside of the housing. For this reason. By attaching an absorbent sheet made of, for example, a rubber sheet to the inside (inner peripheral surface) of the housing, it is possible to prevent the inside of the housing from being damaged by the abrasive ejected from the blast ejection hose.

In addition, a frame is attached so as to surround the corroded portion of the surface of the steel material, and the frame is covered with a light-transmitting sheet to form a closed rectangular parallelepiped internal space on the surface of the steel material. A local anti-corrosion device can also be provided with an air supply port, an arm insertion port, a blast hose insertion port, and a vacuum hose connection port.

That is, when performing repair work on the steel material that constitutes a bridge, first, a frame is attached so as to surround a corroded portion (a portion where rust or the like is occurring) on the surface of the steel material. The attachment of the frame to the surface of the steel material is achieved by, for example, providing a magnet (neodymium magnet) at the attachment portion (contact portion) of the frame to the steel material, thereby fixing the frame to the iron steel material. Then, by sealingly covering this frame with a light-transmissive sheet (for example, a thick vinyl sheet), a closed rectangular parallelepiped internal space is formed on the surface of the steel material. Subsequently, a blast ejection hose is inserted into the main body through the work hose insertion port, and the operator inserts one hand's forearm into the main body through the arm insertion port. While confirming the corroded portion of the steel through the light-transmitting sheet, the operator operates the blast hose with one hand to blast the corroded portion. At this time, the high-speed abrasive ejected from the blast ejection hose and the large amount of rust and paint on the corroded parts that are peeled off and scattered from the surface of the steel material by this abrasive are removed from the vacuum hose connected to the vacuum hose connection port. It is discharged outside. In addition, by supplying air from the air supply port while maintaining the negative pressure in the internal space of the sealed rectangular parallelepiped, the scraps of rust and paint peeled off by the abrasive and the corroded part can be removed by connecting the vacuum hose. It can be discharged smoothly to the outside from the vacuum hose connected to the mouth.

According to the above structure, the simple structure of the frame body and the sheet, and furthermore, by simply providing an air supply port, an arm insertion port, a blast hose insertion port, a vacuum hose connection port, etc. on this sheet, it is possible to repair a bridge locally. It is possible to provide a local anti-corrosion device that can be easily attached to and detached from a corroded portion of a steel material of a bridge during work and that can completely seal the portion to be blasted. In addition, there are no particular restrictions on the position of the air supply port, arm insertion port, blast hose insertion port, vacuum hose connection port, etc. on the vinyl, and they can be arranged at any position where the operator can easily work. can be done.

Also, using a localized corrosion protection device capable of sealing a localized corroded portion on the surface of the steel material, attaching the localized corrosion protection device, performing blasting inside the localized corrosion protection device, and removing the localized corrosion protection device. and a step of anti-corrosion treatment of the corroded portion cleaned by the blast treatment.

When performing local repair work on the steel material of the bridge by the above construction method, a small and lightweight local corrosion protection device that is easy to attach and detach is used on the corroded part of the steel material of the bridge, and blasting is performed inside this local corrosion protection device. Therefore, it is possible to prevent the abrasive material in the blasting treatment and the rust and paint of the corroded portion peeled off by the abrasive material from scattering around. Furthermore, it becomes possible to efficiently repair localized corroded parts of the steel material of the bridge that needs to be repaired.

It is a front perspective view which shows the structure of the local corrosion prevention apparatus which concerns on this embodiment. It is a rear perspective view which shows the structure of the local anti-corrosion apparatus which concerns on this embodiment. It is a perspective view explaining attachment of the local anti-corrosion device which concerns on this embodiment. It is a front perspective view which shows the structure of other embodiment of the local anti-corrosion apparatus which concerns on this embodiment. It is a flowchart explaining the spot reflation construction method which is the construction method of the local repair work of the bridge using the local anti-corrosion device which concerns on this embodiment.

The present invention comprises a box-shaped housing having an opening surface with one side open, and an air supply port, an arm insertion port, a blast hose insertion port, and an observation window on the outer peripheral surface of the housing other than the opening surface. , and a vacuum hose connection port, and is attached so as to seal a corroded portion on the surface of a steel material by the opening surface.

An example of the configuration of the local corrosion protection device according to the present invention will be described below with reference to FIGS. 1 to 5. FIG. FIG. 1 is a front perspective view showing the configuration of a local anti-corrosion device according to this embodiment. FIG. 2 is a rear perspective view showing the configuration of the local anti-corrosion device according to this embodiment. FIG. 3 is a perspective view explaining attachment of the local anti-corrosion device according to this embodiment. FIG. 4 is a front perspective view showing the configuration of another embodiment of the local anti-corrosion device according to this embodiment. FIG. 5 is a flow chart for explaining a spot reflex method, which is a construction method for local bridge repair work using the local anti-corrosion device according to the present embodiment.

In the following embodiments, a case of performing local repair work on steel materials (I-type (H-type), box-shaped steel materials, etc.), which are main constituent members of bridges such as expressways, will be described as an example. In this embodiment, in the repair work of the steel material of the bridge, first, the corroded portion on the surface of the steel material is subjected to blasting. This brass treatment is a treatment (also referred to as surface preparation treatment) for cleaning corroded portions on the surface of the steel material with abrasives ejected at high speed from a blast ejection hose. Then, the blasted corroded portion is coated with a resin (epoxy resin, fluororesin, etc.) paint or metal sprayed for corrosion prevention (including rust prevention). The local anti-corrosion device in the following description is used for blasting in steel repair work.

[First embodiment]
A first embodiment of a local anti-corrosion device of the present invention will be described below with reference to FIGS. 1 to 3. FIG. As shown in FIGS. 1 and 2, the local anti-corrosion device 1 of the present embodiment is constituted by a box-shaped housing 9 having one open surface. A reinforced corrugated cardboard box or the like is preferably used as the housing 9, and the rear surface 12 facing the front surface 10 is an open surface with one side open, and the flaps sealing the rear surface 12 (upper, left and right flaps in the figure) ) F, the rear surface 12 is formed as an open surface. It should be noted that the material constituting the housing 9 is not limited to cardboard, and the box-shaped (rectangular parallelepiped or cubic) housing 9 is formed using a lightweight material such as plywood similar to corrugated board or expanded polystyrene. can also

Two air supply ports 2 are provided on the upper surface 11 of the housing 9 . An arm insertion opening 3, a blast hose insertion opening 4, and an observation window 5 are provided on the front surface 10 of the housing 9. As shown in FIG. A vacuum hose connection port 6 is provided on the bottom surface 13 of the housing 9 .

A blast hose insertion port 4 provided in the lower central portion of the front face 10 of the housing 9 is for inserting a blast ejection hose (not shown) from the blast hose insertion port 4 into the interior of the housing 9. is. For this reason, as shown in FIG. 2, a cylindrical vinyl 4a with open front and rear ends is provided inside the housing 9 of the blast hose insertion port 4. As shown in FIG. By wrapping the blast ejection hose with the vinyl 4a, the abrasive ejected into the housing 9 from the blast ejection hose is prevented from leaking out of the housing 9 from the blast hose insertion port 4. - 特許庁

The arm insertion opening 3 provided on the front surface 10 of the housing 9 on substantially the same horizontal plane as the blast hose insertion opening 4 is used for inserting a worker's one hand forearm into the interior of the housing 9 when performing blasting work. It is. For this reason, as shown in FIG. 2, vinyl gloves 3a are provided inside the housing 9 of the arm insertion opening 3 to protect the forearms of the operator. By protecting the forearms of the operator with the vinyl gloves 3a, the forearms of the operator are prevented from being damaged by the abrasive ejected from the blast ejection hose into the housing 9 at high speed.

The observation window 5 provided above the blast hose insertion port 4 on the front surface 10 of the housing 9 allows the blast ejection hose inserted into the housing 9 from the blast hose insertion port 4 to When a worker holds the forearm of one hand inserted into the housing 9 through the arm insertion opening 3 and operates the blasting hose to perform blasting on a corroded portion of the surface of a steel material, the worker can use the observation window. 5 to confirm the progress of the blasting work on the corroded portion on the surface of the steel material. The observation window 5 is constructed by fitting a transparent glass 5a into a glass frame 5b to ensure the visibility of the operator. The glass 5a is hard to break even if it hits the abrasive material ejected into the housing 9 from the blast ejection hose, and the abrasive material peels off the surface of the steel material and scatters a large amount of rust and paint on the corroded part. A tempered glass or the like to which such as is difficult to adhere is preferably used.

The vacuum hose connection port 6 provided on the bottom surface 13 of the housing 9 is a high-speed abrasive ejected from the blast ejection hose and a large amount of rust and paint on the corrosion site that is peeled off and scattered from the surface of the steel material by this abrasive. etc. (hereinafter also referred to as dust) is to be discharged to the outside of the housing 9 . For this reason, one end of an L-shaped joint 6a made of vinyl chloride is connected to the vacuum hose connection port 6, and a vacuum hose 6b is connected to the other end.

Here, the blast ejection hose (not shown) and the vacuum hose 6b described above are dedicated equipment for blasting, and are synchronized with the blast ejection hose ejecting the abrasive into the housing 9. The vacuum hose 6b sucks the abrasive material and dust ejected into the housing 9. As shown in FIG. For this reason, the equipment for ejecting the abrasive from the blast ejection hose and the equipment for sucking the abrasive from the vacuum hose 6b can be loaded on a dedicated truck as blasting equipment, for example, and moved according to the position for repairing the steel material of the bridge. It is desirable to have a simple configuration.

According to the local corrosion protection device 1 configured as described above, blasting can be performed without the high-speed abrasive ejected from the blast ejection hose or the rust of the corroded portion peeled off by the abrasive and dust such as paint being scattered around. It can be done inside a closed housing 9 . That is, when repairing a bridge locally, it can be easily attached to the corroded portion of the steel material of the bridge, and the portion to be blasted can be completely sealed.

Absorption sheets S are attached to the inner side surfaces of the housing 9 and the bottom surface 13 to absorb the impact of the abrasive in the blasting process. A rubber sheet or the like is preferably used as the absorbent sheet. As a result, it is possible to prevent the inside of the housing 9, which is made of a lightweight and insufficiently strong material, from being damaged by the high-speed abrasive ejected from the blast ejection hose.

Further, both lower corners inside the housing 9 are reinforced with reinforcing members 7 . The reinforcing member 7 is made of metal, reinforced corrugated cardboard, or the like, and the abrasive ejected from the blast ejection hose into the interior of the housing 9 concentrates on the lower corners of the interior of the housing 9, It is possible to prevent the abrasive material and dust from leaking from the inside of the housing 9 to the outside due to breakage of the part.

The attachment of the local anti-corrosion device 1 to the surface of the steel material will be described below with reference to FIG. As shown in FIG. 3( a ), the local corrosion protection device 1 is configured such that the housing 9 is mounted on the surface Ha of the steel material H so that the corrosion site R on the surface Ha of the steel material H is covered with the rear surface 12 , which is the opening surface of the housing 9 . is installed in At this time, the housing 9 is arranged such that the flaps F (for example, two side flaps and one flap) with the rear surface 12 open are superimposed on the surface Ha of the steel material H.

Then, as shown in FIG. 3(b), the flap F with the back surface 12 open is placed on the surface Ha of the steel material H, and the flap is fixed to the surface Ha of the steel material H with an adhesive tape T. By doing so, the attachment of the local corrosion protection device 1 to the surface Ha of the steel material H is performed. As the adhesive tape T, a gummed tape that is easy to handle and has a high adhesive strength (general term for so-called craft adhesive tape, cloth adhesive tape, OPP adhesive tape, etc.) is preferably used.

It should be noted that the mounting of the local anti-corrosion device 1 to the locally corroded portion of the surface of the steel material in the blasting work described above and the blasting work are, for example, a special high-place technology in which a worker climbs into an aerial work vehicle that is a mechanical scaffolding. This is done by suspending the worker with a worker rope that is hung from a high place. In this embodiment, when performing local repair work on a bridge, the local corrosion protection device 1 using the small and lightweight housing 9 is used, so that large-scale work like the conventional one is not necessary despite the dangerous high-place work. Workers can easily attach and detach from the corroded portion R of the steel material H of the bridge without installing scaffolding, and furthermore, since the portion to be blasted can be completely sealed, the safety of the worker can be ensured.

[Second embodiment]
A second embodiment of the local anti-corrosion device of the present invention will be described below with reference to FIG. In the following description, the same configuration as that of the first embodiment will be omitted, and only the different points will be mainly described.

As shown in FIG. 4, in the local corrosion protection device 1 of this embodiment, unlike the first embodiment described above, a frame W is attached so as to surround the corroded portion R of the surface Ha of the steel material H. As shown in FIG. The frame body W has four mounting legs Wb connected to the four corners of the square frame Wa, respectively. are provided respectively. As this magnet G, a well-known neodymium magnet is preferably used. The magnetic force of the magnet G makes it possible to attach the frame W so as to surround the corroded portion R of the surface Ha of the steel material H. As shown in FIG.

Further, the frame body W is covered with a light-transmitting sheet BS, and the four sides of this sheet are fixed to the surface Ha of the steel material H with an adhesive tape T. As shown in FIG. A transparent thick vinyl sheet is preferably used as the sheet BS. As a result, a substantially rectangular parallelepiped internal space that is sealed in the surface Ha of the steel material H can be formed.

The seat BS is provided with an air supply port 2, an arm insertion port 3, a blast hose insertion port 4, and a vacuum hose connection port 6 at arbitrary positions. These air supply port 2, arm insertion port 3, blast hose insertion port 4, and vacuum hose connection port 6 are the same as those in the first embodiment described above.

According to the configuration of the second embodiment, the simple configuration of the frame body W and the sheet BS further includes the air supply port 2, the arm insertion port 3, the blast hose insertion port 4, and the vacuum hose connection port 6 on the sheet. It is possible to provide a local anti-corrosion device that can be easily attached to and detached from the corroded portion of the steel material of the bridge only by providing it and can completely seal the portion to be blasted when performing local repair work on the bridge. . The positions of the air supply port 2, the arm insertion port 3, the blast hose insertion port 4, and the vacuum hose connection port 6 on the seat BS are not particularly limited, and can be arbitrarily placed at a position where the operator can easily work. can be arranged.

Hereinafter, with reference to FIG. 5, the procedure of the spot reflation method, which is a method of locally repairing the steel material of a bridge using the local anti-corrosion device 1 according to the present embodiment, will be described.

As shown in FIG. 5, in the spot reflex construction method of the present embodiment, first, the local anti-corrosion device 1 is attached to the corroded portion of the surface of the steel material that constitutes the bridge (step S10). Subsequently, blasting is performed to clean the corroded portion on the surface of the steel material (step S11). Subsequently, the local anti-corrosion device 1 attached to the corroded portion on the surface of the steel material is removed (step S12). Subsequently, the corroded portion that has been cleaned (surface adjustment) by the blasting is subjected to anticorrosion treatment (step S13). Finally, it is determined whether or not a corroded portion remains on the surface of the steel material constituting the bridge (step S14), and if it is determined that a corroded portion remains (step S14: Yes), the process from step S10 repeat. On the other hand, if it is determined that no corroded portion remains (step S14: No), this process is terminated.

In the anti-corrosion treatment in step S13, a resin (epoxy resin, fluororesin, etc.) paint for anti-corrosion (including rust prevention) is applied to the corroded portion of the surface of the steel material cleaned by the blasting treatment in step S11. Painting and metal spraying are performed by This anti-corrosion treatment is performed according to the durability performance required for the steel material that constitutes the bridge. In the case of painting, a plurality of undercoats, intermediate coats, top coats, etc. are performed. Examples of multiple undercoats include organic zinc-rich paint, weak solvent-type modified epoxy resin paint undercoat, and weak solvent-type modified epoxy resin paint undercoat. The middle coat is a weak solvent-type fluorine resin paint middle coat, and the top coat is a weak solvent-type paint. Fluororesin paint top coating etc. are performed. In addition, in the case of process-saving coating, ensure sufficient coating thickness with one layer. When metal spraying is performed, a zinc-aluminum alloy or an aluminum-magnesium alloy is sprayed.

As described above, according to the local anti-corrosion device 1 of the present embodiment, the installation work at the installation site is easy in the repair work of the local corrosion parts occurring on the surface of the steel material of the bridge, and the construction period is can be shortened, the economic effect is large in repair work.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims.・Changes are possible.

1 Local corrosion protection device 2 Air supply port 3 Arm insertion port 4 Blast hose insertion port 5 Observation window 6 Vacuum hose connection port H Steel material S Absorption sheet R Corrosion part

Claims (3)

A box-shaped housing made of reinforced corrugated cardboard having an opening surface with one side open;
On the outer peripheral surface of the housing other than the opening surface,
an air supply port capable of adjusting the flow rate of air supplied to the inside of the housing;
an arm insertion opening;
a blast hose insertion port;
an observation window;
Equipped with a vacuum hose connection port and
A local anti-corrosion device, characterized in that it is attached to a corroded portion of the surface of a steel material so as to be sealed by said opening. 2. A local anti-corrosion device according to claim 1, wherein an absorbing sheet is attached to the inside of said housing for absorbing the impact of the abrasive during blasting. A frame is attached so as to surround the corroded part on the surface of the steel material, and the frame is covered with a light-transmitting sheet to form a closed rectangular parallelepiped internal space on the surface of the steel material,
on said sheet,
an air supply port capable of adjusting the flow rate of air supplied to the internal space ;
an arm insertion opening;
a blast hose insertion port;
a vacuum hose connection, and
A local corrosion protection device comprising:

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