JP2018204700A - Pipeline repair method - Google Patents

Abstract

To provide a method capable of repairing a pipeline even in a case where a worker does not approach a place to be repaired of the pipeline.SOLUTION: A method for repairing a pipeline configured to transport fluid, comprises: using a repair jig and a spraying repair material, wherein the repair jig having an attachment part for the pipeline and a check valve projecting from the attachment part; attaching the repair jig to a place to be repaired of the pipeline through the attachment part from a place separate from the place to be repaired of the pipeline, wherein the check valve is opened; spraying the spraying repair material to the attachment part and the place to be repaired of the pipeline from the place separate from the place to be repaired of the pipeline; and after curing the spraying repair material, closing the valve of the repair jig from the place separate from the place to be repaired of the pipeline.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe repair method.

Various pipes are provided in the plant. Various fluids circulate in the piping and are used to transport fluid from one location to the other.

Pipes installed in the plant are exposed to wind and rain, corrosive fluid flowing through the inside, corrosive gas generated in the plant, and the like, and the corrosion gradually proceeds due to aging. When corrosion progresses, a fragile part is formed by opening a hole in the pipe or reducing the thickness of the pipe. If the fragile portion breaks due to the pressure of the fluid or external factors, the fluid flowing through the inside of the pipe will leak from there.

As a technique for repairing the piping, for example, techniques such as Patent Documents 1 to 3 are known.

Patent Document 1 describes that a valve body provided with a handle is fixed with an epoxy-based adhesive to a repaired portion such as a pinhole generated in piping, and the adhesive is cured. Since the valve is open until the epoxy adhesive is cured, the pressure of the fluid flowing through the piping prevents the formation of leak holes in the uncured epoxy adhesive. It is supposed to be possible.

Patent Document 2 describes a method of repairing a gas leak location in a gas pipe. In this method, the gas leaking portion is covered with a bowl-shaped covering member from above and below so as to cover the gas leaking portion. A space between the covering member and the covering member communicates with a housing to which a service port incorporating a valve is connected. The covering member is brazed and welded to the gas pipe while the gas is sucked by the gas recovery machine through the housing. According to the method of the cited document 2, it is supposed that the gas pipe can be repaired without collecting the gas in advance.

Patent Document 3 describes a contact member that is attached to a metal plate in the order in which a discharge nozzle, a small valve, and a rubber hose for drainage are described. The contact member is bonded to the outer surface of the pipe with the discharge nozzle of the repair jig released. Next, the discharge nozzle is closed and the metal plate is tightly bound to the pipe using a fastener. According to this method, it is said that a leaking part can be repaired without stopping the operation of the plant.

JP 2006-83906 A JP 2008-303982 A Japanese Patent Laid-Open No. 61-127996

In the repair method of patent documents 1 thru | or 3, the contact member provided with the valve | bulb, the tubular coating | coated member to which the housing was connected, or a metal plate etc. is used as a repair jig. However, in the method of Patent Document 1, an epoxy adhesive is used when fixing the valve to the pipe. For this reason, in order to fix the valve to the pipe, it is necessary for the operator to approach the pipe, apply an epoxy adhesive, and close the valve by hand.

In the method of Patent Document 2, when the coating material is welded to the pipe, the operator still needs to approach the pipe. Even in the method of Patent Document 3, it is necessary for an operator to approach the pipe when fixing the contact member to the pipe using the fastener.

In many cases, a fluid harmful to the human body circulates inside the pipe. It is preferable to repair the pipe from a location away from the repair location because such a harmful fluid may leak from the location where the repair is required in the piping.

An object of this invention is to provide the method of repairing piping, even if an operator does not approach the repair location of piping.

A method for repairing a pipe that conveys a fluid, in which the pipe is repaired using a repair jig having a mounting portion for the pipe and a check valve protruding from the mounting portion, and a spray repair material. Attach a repair jig with a valve open from a place away from the pipe to the repaired part of the pipe through the mounting part, and spray the mounting part and the pipe repaired part from a place away from the pipe repaired part The above-mentioned problem is solved by a repairing method for piping in which a repair material is sprayed and the valve of the repair jig is closed after the spray repair material is cured.

When spray repair material was sprayed onto the repaired part of the pipe, the check valve of the repair jig was open, so the repaired part was sprayed onto the repaired part by the pressure of the fluid flowing through the pipe. It is possible to prevent the repair material from being blown off, or a fine hole or a crack from being generated in the sprayed repair material, from which the fluid inside the pipe leaks out. The spray repair material is sprayed onto the pipe repair site from a location away from the pipe repair site. The repair jig is also attached to the pipe from a place away from the pipe repair point. For this reason, even if an operator does not approach piping, it is possible to finish the work which repairs piping.

In the above pipe repair method, the repair jig further includes a lid in addition to the check valve, and the valve is opened by attaching the lid to the check valve. It is preferable to do so. After the spray repair material has hardened, the check valve can be closed by a simple operation of removing the lid from the check valve. Since the operation is simple even from a location away from the pipe repair location, it is possible to easily switch between opening and closing of the valve.

In the above pipe repair method, at least one of the lid and the check valve constituting the repair jig includes a magnet, and the lid is fixed to the check valve by the magnet. Is preferably in an open state. The operator can remove or attach the lid from the check valve by a simple operation of pulling the lid with a force against the magnetic force or attaching the lid to the check valve according to the magnetic force. Since the operation is simple even from a location away from the pipe repair location, it is possible to easily switch between opening and closing of the valve.

In the above pipe repair method, the repair jig includes a check valve and a retractable portion made of an elastic material, and the angle of the mounting portion with respect to the check valve is adjustable by the tiltable portion. It is preferable. This makes it possible to freely change the angle and direction of inclination of the check valve when removing the cover of the repair jig. Similarly, when the repair jig is attached to the pipe, the angle and direction of the attachment portion can be freely changed.

In the above pipe repair method, the check valve has an exhaust hole on the tip side, and the exhaust hole is covered with the cover body in a state where the cover body is fixed to the check valve. The fluid preferably leaks from between the lid and the check valve. By covering the exhaust hole with the lid, it is possible to prevent the spray repair material from entering the exhaust hole.

In the above pipe repairing method, it is preferable that the mounting portion for the pipe is made of a flat material having flexibility. By doing in this way, it deform | transforms so that the shape of an attaching part may follow according to the external shape of piping, and it becomes possible to fix a repair jig with respect to piping which has various shapes.

In the above pipe repair method, it is preferable that the repair jig is attached to the repair location from a location away from the repair location of the piping using a hook-shaped assist tool.

In the above pipe repairing method, it is preferable to use a hook-shaped auxiliary tool so that the cover of the repair jig can be removed from the check valve from a location away from the pipe repair location.

In the above pipe repairing method, the step of spraying the spray repair material on the mounting part and the pipe repair point from a position away from the pipe repair point is performed by applying the spray repair material from the tip of the hollow pipe having the gripping part. It is preferable to make it discharge and to spray on a repair location.

In the above piping repair method, the spray repair material preferably includes an elastic synthetic resin powder, a hydraulic material powder, and water. If it is such a repair material, it will become possible to mix two types of powder and water on-site, and to spray on a repair location with a spraying machine. By blending the elastic synthetic resin, the repair material is easily fixed on the pipe, and the hardened body can be finished tough.

It is possible to provide a method capable of repairing a pipe without an operator approaching the pipe repair point.

It is a figure which shows a mode that a repair jig is attached with respect to piping. It is an enlarged view of the A section of FIG. It is a figure which shows a mode that spray repair material is sprayed on the repair location of piping, and the attachment part of a repair jig. It is an enlarged view of the B section of FIG. It is a figure which shows a mode that the cover body of a repair jig is removed with a hook-shaped auxiliary tool. It is an enlarged view of the C section of FIG. It is sectional drawing of a repair jig. It is sectional drawing of the repair jig in the state which removed the cover body. It is sectional drawing which shows the state which decomposed | disassembled the repair jig. It is a figure which shows the structure of a spraying machine. It is a top view which shows a bowl-shaped auxiliary tool. It is a figure which shows a mode that the auxiliary tool of FIG. 10 opens and closes. It is a front view of the auxiliary tool of FIG. It is a top view which shows a mode that the repair jig was hold | gripped with the auxiliary tool of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following embodiment is merely an example, and the technical scope of the present invention is not limited to this.

The pipe repair method according to the present embodiment is carried out on a pipe in an ironworks that can carry out a blast furnace integrated iron making process. Of course, the target for carrying out the repair method according to the present invention is not limited to the pipes installed in the steelworks.

In steelworks that implement the integrated blast furnace ironmaking process, by-product gas is generated in addition to steam, hot water, industrial water, etc. that are frequently used in other plants. Examples of main by-product gas include by-product gas generated in the coke oven, by-product gas generated in the blast furnace, and gas generated in the converter. These are hereinafter referred to as coke gas, blast furnace gas, and converter gas.

Coke gas is generated when coal is carbonized in a coke oven, and is derived from volatile components contained in the coal. Its main components are hydrogen (about 55% by volume) and methane (about 30% by volume), which are highly flammable. Blast furnace gas is generated when iron ore is reduced using coke as a reducing agent in a blast furnace. Its main component is carbon monoxide (about 20% by volume), which is highly flammable and harmful to the human body. Converter gas is generated when oxygen is blown into pig iron and refined into steel. Its main component is carbon monoxide (about 70% by volume), which is highly flammable and harmful to the human body. Since these by-product gases are highly flammable, they are used as a heat source for heating furnaces and hot air furnaces in steelworks. The temperature when these by-product gases are flowing through the pipes in the steelmaking school is approximately 20 ° C to 70 ° C.

The by-product gas, steam, hot water and the like as described above are passed through the piping when transported from one place in the plant to another place. If the pipe is corroded due to aging or damaged due to external factors, flammable by-product gas leaks out of the pipe. If high temperature steam, hot water, or flammable by-product gas leaks out of the piping, it may cause burns or fire, which is dangerous. For this reason, it is necessary to promptly repair the places where the pipe is corroded or damaged. However, when the repair is performed in a state where the fluid is circulating in the pipe without stopping the operation, the worker may be exposed to the fluid harmful to the human body as described above.

The piping for conveying the fluid as described above may be installed at a high place of about 5 to 10 m from the ground. In order for an operator to approach a repaired part of a pipe installed at a high place, it is necessary to build a scaffold first. For this reason, the repair process tends to be complicated in piping installed at high places.

In the pipe repair method according to this embodiment, the pipe 11 can be repaired from a location away from the repair location 12 of the pipe 11 as shown in FIGS.

In the repair method according to the present embodiment, as shown in FIGS. 7 to 9, the repair jig 2 having the attachment portion 21 for the pipe 11 and the check valve 22 protruding from the attachment portion 21, and the spray repair material 1. And use. As shown in FIGS. 1 and 2, the repair jig 2 in a state in which the valve is opened with respect to the repair location 12 of the pipe 11 from the location away from the repair location 12 of the pipe 11 via the attachment portion 21. Install. As will be described later, the repair jig 2 with the valve opened is shown in FIG. Next, as shown in FIGS. 3 and 4, the spray repair material 1 is sprayed on the attachment portion 21 and the repair location 12 of the pipe 11 from a location away from the repair location 12 of the pipe 11. As shown in FIGS. 5 and 6, the repair work is completed by closing the valve of the repair jig 2 from a location away from the repair location 12 after the spray repair material has hardened.

As described above, in the repair method of this embodiment, the repair jig 2 shown in FIGS. 7 to 9 is used. As shown in FIG. 9, the repair jig 2 is attachable to and detachable from the attachment portion 21 to the pipe 11, the check valve 22 protruding from the attachment portion 21 to the opposite side of the attachment surface to the pipe 11, and the check valve 22. A lid 23 attached to the body, and a retractable portion 24 made of an elastic material.

The attachment part 21 will be described. The attachment portion 21 for the pipe 11 is made of a flexible flat material, and has a through-hole 211 in the middle in plan view or bottom view. 7 to 9 are substantially circular in plan view, but may be polygonal. If there is a gap between the pipe 11 and the mounting portion 21, fluid leaks from the gap and hinders the spraying work of the spray repair material. Since the attachment portion 21 is made of a flexible material, the attachment portion 21 deforms following the outer shape of the pipe 11 and is fixed in a state where the attachment portion 21 is in close contact with the pipe 11 having various outer diameters. It is possible to do.

More specifically, the attachment portion 21 is composed of a flexible magnet sheet. The magnet sheet is a mixture of a permanent magnet powder mixed with an elastic synthetic resin such as polyvinyl chloride or an elastomer such as natural rubber or synthetic rubber, and deforms following the outer shape of the pipe 11, The pipe 11 attracts strongly with a ferromagnetic material such as iron or steel. The repair jig 2 can be detachably attached to the pipe 11 via the attachment portion 21 by utilizing the property that the magnet sheet strongly attracts the ferromagnetic material.

If the attachment part 21 is comprised from a magnetic sheet, the attachment part 21 which has flexibility can improve workability | operativity at the time of attaching the repair jig 2 with respect to the piping 11 using a hook-shaped auxiliary tool, for example. it can. That is, when the attachment part 21 made of a magnet sheet is brought close to a pipe made of a ferromagnetic material such as iron or steel, the attachment part 21 is brought into close contact with the pipe 11 so as to be drawn to the pipe 11. Since the magnet sheet has flexibility, it automatically deforms and adheres to the outer shape of the pipe 11.

It is also possible to fix the attachment portion 21 to the pipe 11 using an adhesive. However, in the case of an adhesive, a curing time is required, and it is necessary to remove dust, dirt, oil, and the like on the surface to which the adhesive is applied. If it is a magnet sheet, the repair jig 2 can be firmly fixed to the pipe 11 without particularly cleaning the repair site. Moreover, if it is a magnetic sheet, unlike the adhesive agent, it is not necessary to ensure the curing time, so that the spray repair material can be sprayed quickly.

When it is necessary to more firmly fix the attachment portion 21 to the pipe 11, for example, it is preferable to use a magnet sheet and an adhesive such as an epoxy adhesive in combination. For example, it may be difficult to fix the magnet sheet due to circumstances such as the outer shape of the pipe 11 being undulating or having oxidation or dirt. In such a case, a magnetic sheet and an adhesive may be used in combination. The adhesive has fluidity until it is cured. For example, even if there are fine irregularities on the surface of the pipe 11, the uncured adhesive is filled in the gaps such as the depressions and cured. Thereby, the repair jig 2 can be reliably fixed to the pipe 11. In addition, since the adhesive filled in the gaps such as the recesses also functions as a gasket, it is possible to improve the airtightness by closing the gap between the pipe 11 and the attachment part 21.

When the magnet sheet and the epoxy-based instant adhesive are used in combination, the attachment portion 21 keeps in close contact with the pipe 11 due to the magnetic force. Therefore, when the magnet sheet and adhesive are used together, it is not necessary to tighten the mounting part with a fastener or keep pressing the mounting part with a hook-shaped auxiliary tool until the epoxy adhesive is cured. Become. In particular, in the case of a pipe having a small curvature, the end of the mounting portion 21 is lifted, and thus it is difficult to adhere to the pipe 11. If a magnetic sheet is used, it becomes possible to solve the problem. In addition, what is necessary is just to use an adhesive agent independently when fixing the attaching part 21 with respect to the piping 11 comprised from a nonmagnetic material.

The check valve 22 will be described. As shown in FIG. 9, the check valve 22 has a cylindrical shape having an opening at one end and the other end, a cylindrical member 221 having a step 221a on its inner peripheral surface, and a poppet type valve member having a valve 222a. 222, an annular member 223 having an opening at both ends and having a plurality of through holes 223a on the peripheral surface, and an annular first permanent magnet 224 having openings at both ends. As shown in FIG. 7, the poppet type valve member 222 is built in the cylindrical member 221, and its position is fixed by a step 221 a extending along the inner peripheral surface of the cylindrical member 221. An annular member 223 is fixed to the upper end portion of the cylindrical member 221, and a first permanent magnet 224 is fixed to the upper end portion of the annular member 223. In this example, the cylindrical member 221 and the annular member 223 are configured as separate members, but the cylindrical member 221 and the annular member 223 may be integrally formed.

The cylindrical member 221 is a member used for increasing the protruding amount. That is, when the through hole 223a of the annular member 223 used as the exhaust hole is close to the pipe 11, the check valve 22 may not operate normally due to the blowing repair material 1 entering from the through hole 223a. . By arranging the cylindrical member 221 and increasing the protruding amount of the check valve 22, it is possible to prevent the above problem from occurring.

The poppet-type valve member 222 has a substantially annular shape, and has a through hole 222b in the middle. The upper member 222c in which the end of the through hole 222b functions as a valve seat; the valve 222a; the valve 222a as the valve seat A spring 222d for urging the spring; a holding portion 222e of the spring 222d, a vent hole 222f, and a fitting portion 222g; and a substantially annular lower member 222h; O-ring 222i. The O-ring 222i is fitted into a recess provided between the upper member 222c and the lower member 222h, and is in close contact with the inner peripheral surface of the cylindrical member 221, and between the poppet type valve member 222 and the cylindrical member 221. Ensure airtightness.

The upper member 222c includes an annular ridge 222j that protrudes downward. Both are fixed by fitting the protrusion 222j into the fitting part (concave groove) 222g of the lower member. It may be fixed by welding or an adhesive. The lower member 222h includes a holding portion 222e of a spring 222d made of an annular concave groove. As shown in FIG. 9, one end of the spring 222d (coil spring) is hooked on the holding portion 222e, and the other end of the spring 222d is hooked on the back side of the valve 222a. The lower member 222h includes a vent hole 222f that communicates from the bottom surface side to the through hole 222p. The vent hole 222f is formed of a slit-like hole that is intermittently provided in the circumferential direction when the lower member 222h is viewed from the bottom surface side.

As shown in FIG. 8, the valve 222 a includes a columnar portion 71, a contact portion 72 to a valve seat protruding in a direction intersecting the axial direction of the columnar portion 71 from the upper end portion thereof, and an upper portion of the contact portion 72. And a protrusion 73 disposed on the surface. The valve 222a is urged upward by the above-described spring 222d, and airtightness is exhibited when the contact portion 72 is in close contact with the valve seat.

A through hole 222k is opened in the middle of the spring holding portion 222e as shown in FIG. The holding portion 222e is provided with a guide portion 222m of the columnar portion 71 so as to surround the through hole 222k. The guide portion 222m guides the movement of the columnar portion 71 of the valve 222a in the up and down direction so that the operation does not swing in the left and right direction. The columnar portion 71 is a concave portion that is recessed from the bottom surface side to the top surface side, and has a shape that easily receives the fluid flowing out from the pipe 11. Since the peripheral surface of the columnar portion 71 and the guide portion 222m are in sliding contact with each other, the fluid flowing out from the pipe 11 is guided to the concave portion of the columnar portion 71.

The lid 23 will be described. As shown in FIG. 9, the lid body 23 includes a lid main body 234 having a male screw that functions as a pressing member 231 of the valve 222 a, a top plate 232, and an annular wall 233 that extends downward from the end, and a male screw. A female screw 235 to be screwed onto the top plate 232, a second permanent magnet 236 fixed to the back surface of the top plate 232, and a first spacer 237 disposed between the top surface of the top plate 236 and the head of the male screw. And a second spacer 238 disposed between the lower surface of the top plate and the upper surface of the female screw 235. The pressing member 231 is fixed by a female screw 235 while being inserted into a through hole provided in the top plate 232.

As shown in FIG. 7, when the lid body 23 is fixed to the check valve 22, the lower end portion of the pressing member 231 comes into contact with the protrusion 73 of the valve 222a, and resists the biasing force of the spring 222d. Press down 222a. Then, as shown by the black arrows in FIG. 7, the through hole 211 of the attachment portion 21, the through hole 241 of the retractable portion 24 described later, the internal space of the cylindrical member 221, and the vent hole of the lower member 222 h 222f, the through hole 222p of the lower member 222h, the through hole 222b of the upper member 222c, and the plurality of through holes 223a of the annular member 223 communicate with each other. The fluid flowing inside the pipe 11 flows out of the through hole 223a of the annular member 223 through the communication path, and extends from between the annular wall 233 and the annular member 223 of the lid 23 toward the attachment portion 21 of the repair jig. It is discharged towards. Since the fluid is discharged in the direction of the mounting portion 21, when the spray repair material is sprayed on the repaired portion, the operation of spraying the spray repair material by the fluid discharged from the repair jig 2 is prevented from being hindered. It is possible.

As described above, the valve is opened by attaching the lid 23 to the check valve 22. It may be configured to close the valve by attaching the lid 23 and open the valve by removing the lid, but in that case, spray the spray repair material with the lid removed. It will be. If it does so, since it becomes easy for a spray repair material to penetrate | invade the inside of a non-return valve, it is unpreferable. That is, in the repair jig 2 described above, the cover 23 is mounted on the check valve 22 so that the valve is opened. Therefore, the spray repair material 1 is blocked by the cover 23 and the spray repair material 1 is 22 is difficult to enter.

As shown in FIG. 8, when the lid body 23 is removed from the check valve 22, the valve 222a is pushed up by the fluid flowing out from the spring 222d and the pipe 11 and comes into close contact with the valve seat of the upper member 222c. Since the valve 222a is pressure-bonded to the valve seat by the pressure of the fluid flowing in the pipe, the higher the internal pressure of the pipe, the stronger the pressure comes into close contact with the valve seat, thereby preventing fluid leakage. The spring 222d may be omitted, but by providing the spring 222d, the valve 222a is not intended when the pressure in the pipe is low, such as when the pressure of the fluid in the pipe is almost close to atmospheric pressure. It is possible to prevent opening.

As shown in FIGS. 7 and 8, the lid body 23 and the check valve 22 utilize the force that the first permanent magnet 224 on the check valve side and the second permanent magnet 236 on the lid side attract. Fixed to each other. Due to this magnetic force, the pressing member 231 of the lid 23 is in close contact with the protrusion 73 of the check valve 22 and the valve 222a is pushed down. To remove the lid 23 from the check valve 22, it is only necessary to pull the lid 23 against the magnetic force. As described above, the valve 222a is opened and closed by using the attachment and detachment of the lid 23. Therefore, it is not necessary to turn the handle or operate the opening / closing lever when opening / closing the valve 222a. For example, the lid 23 is attached to and detached from the check valve 22 using the hook-shaped auxiliary tool 4, so that the valve 222 a can be easily opened / closed from a location familiar with the repair location.

In the repair jig of the present embodiment, the first permanent magnet 224 is provided on the check valve 22 and the second permanent magnet 236 is provided on the lid. A magnet is good also as a structure which provides in any one member among the cover body 23 and the non-return valve 22, and uses high magnetic bodies, such as iron and steel, for the other member.

As shown in FIG. 7, in a state where the lid body 23 is attached to the check valve 22, the through hole 223 a of the annular member 223 that functions as an exhaust hole is covered with the annular wall 233 of the lid body 23. As a result, as shown in FIGS. 3 and 4, when the spray repair material 1 is sprayed to the repair location 12 and the attachment portion 21, the spray repair material 1 enters the check valve 22 from the through hole 223 a. Can be prevented.

As shown in FIGS. 7 to 9, the repair jig 2 includes a retractable portion 24 made of an elastic material between the check valve 22 and the attachment portion 21. The retractable portion 24 is a cylindrical member, and has openings at the upper end portion and the lower end portion thereof. The opening at the upper end portion communicates with the opening of the cylindrical member 221, and the opening at the lower end portion is the opening of the mounting portion 21. It communicates with the through hole 211. The retractable portion 24 has a bellows shape including a concave portion and a convex portion along the circumferential direction, and is made of an elastic material including an elastomer such as natural rubber or synthetic rubber. For this reason, when stress is applied to one member of the attachment portion 21 and the check valve 22, one member falls over the other member. When the stress is removed, the original shape is restored by the restoring force of the elastic material. As a result, the angle of the check valve 22 or the attachment portion 21 can be freely adjusted.

For example, as shown in FIGS. 1 and 2, when attaching the repair jig 2 to the repair location 12 of the pipe 11 using the hook-shaped assist tool 4, the check valve supported by the assist tool 4. 22, the angle of the attachment portion 21 changes flexibly, and the attachment portion 21 can be easily attached to the repair location 12 of the pipe 11. In addition, when blowing the repairing material 1 to be described later, when the wind pressure is blown, or when the tip of the hook-shaped auxiliary tool 4 or the hollow tube 52 accidentally hits the repairing tool 2 during the repair work, It can also absorb shocks.

For example, as shown in FIGS. 5 and 6, when the lid 23 of the repair jig 2 is removed from the check valve 22 using the hook-shaped auxiliary tool 4, the mounting portion supported by the pipe 11. 21, the angle of the check valve 22 changes flexibly, and the lid 23 can be easily removed from the check valve 22. In addition, in FIG. 6, the attachment part 21 covered and covered with the spray repair material 1 was shown with the broken line.

A method for attaching the repair jig 2 to the repair location 12 of the pipe 11 will be described in more detail. As shown in FIGS. 1 and 2, first, the check valve 22 to which the above-described lid body 23 is attached is attached to the distal end portion 42 of the bowl-shaped auxiliary tool 4. The worker 8 grips the gripping portion 47 arranged on the base end portion 41 of the bowl-shaped auxiliary tool 4 and makes the hook-shaped auxiliary tool 4 against the repaired portion 12 of the pipe 11 installed at a high place. The repair jig 2 attached to the front end portion 42 is brought closer to the repair location 12. As described above, the attachment portion 21 of the repair jig 2 is composed of a magnet sheet. When the repair jig 2 is brought close to the repair location 12 to some extent, it is attracted to the repair location 12 of the pipe 11 and the magnet sheet deforms and adheres along the outer shape of the pipe 11. When the adhesive is used, the magnet sheet is kept in close contact with the magnetic force and waits for a while until the adhesive is cured. Since the valve of the repair jig 2 is in an open state, as shown in FIGS. 3 and 4, when the repair jig 2 is in close contact with the pipe 11, the check valve 22 and the lid body 23 of the repair jig 2. The fluid inside the pipe leaks from between.

As shown in FIGS. 3 and 4, the hollow tube having the gripping portion 51 at the base end portion 59 with respect to the attachment portion 21 of the repair jig 2 temporarily fixed to the repair portion 12 of the pipe 11 and the repair portion 12. Spraying repair material 1 is sprayed from the tip of 52. In the repair method of the present embodiment, the sprayer 5 having a metal rod called a lance shown in FIGS. 3 and 10 is used as the hollow tube 52.

As shown in FIG. 10, the sprayer 5 includes a pressurized air supply unit 53, a raw material powder storage unit 54 containing hydraulic material powder and elastic synthetic resin powder, and an ejector 56 that sucks the raw material powder. A flexible hose 57 connected to the discharge port of the ejector 56, a hollow tube 52 connected to the tip of the flexible hose 57, and a water supply unit 58 for supplying water to the tip of the hollow tube 52 including. The water supply part 58 can be comprised, for example from the pump which conveys water, a flexible hose, the valve which switches the presence or absence of supply of water, etc.

When the pressurized air supplied from the pressurized air supply unit 53 is supplied to the ejector 56, the raw material powder is sucked from the storage unit 54. The mixture of the raw material powder and the pressurized air is supplied to the hollow tube 52 through the flexible hose 57. Water is supplied to the hollow tube 52 from the water supply unit 58, and water and raw material powder are mixed inside the hollow tube 52 after the water supply unit 58. The mixed spray repair material 1 is discharged from the tip of the hollow tube 52.

The tip side portion of the hollow tube 52 is preferably a hollow tube made of a synthetic resin material. As a result, it is possible to prevent the hollow tube from being clogged with a mixture of the raw powder of the spray repair material 1 and water and clogging the hollow tube.

When the spray repair material 1 is sprayed directly onto the repair location 12 using the hollow tube 52 connected to the spray machine 5 as described above, the spray repair material 1 is fixed to the spray repair location 12. However, it is difficult to close the hole formed in the repaired portion 12 by forming fine cracks or minute holes such as ant nests in the blowing repair material 1 blown off or temporarily fixed.

In the repair method of the present embodiment, the repair jig 2 is temporarily fixed to the repair spot 12 of the pipe 11, and the fluid inside the pipe is released from the gap between the check valve 22 and the lid 23 of the repair jig 2. It is possible to prevent fine cracks and holes from being formed and blowing repair material from being blown off. As a result, it is possible to efficiently spray and fix the spray repair material 1 to the attachment portion 21 and the repair location 12 of the repair jig 2.

The spray repair material 1 is preferably cured by a hydraulic material. The hydraulic material can be preferably used because there is no possibility of igniting the fluid even if the fluid flowing through the inside of the pipe 11 is highly flammable. In addition, since the powder and water can be mixed in the hollow tube 52 using the spraying machine 5 as described above, it is possible to prepare the spray repair material on the site extremely easily and quickly. Therefore, it is possible to easily perform repair work. Examples of the hydraulic material include ordinary Portland cement. Examples of the elastic resin include an ethylene-vinyl acetate copolymer.

The spray repair material preferably contains an elastic synthetic resin powder. This makes it easier for the spray repair material to adhere to the pipe 11 and to impart toughness and elasticity to the cured body.

A fluid circulates inside the pipe 11. Further, the pipe 11 may be installed in an environment where it is exposed to wind and rain or direct sunlight. For this reason, the dimension of piping may change a little with the temperature change of the fluid which distribute | circulates the inside of piping, or the temperature change from the outside. By imparting toughness and elasticity to the cured body, it is possible to prevent the cured body from being cracked or damaged due to a dimensional change of the pipe 11.

In the spray repair material 1, an aggregate may be blended in order to improve workability, and a quick setting agent or a thickener may be blended in order to adjust the curing time or viscosity.

The spray repair material 1 used in the method of the present embodiment contains a hydraulic material and is cured by taking time. After the spray repair material 1 is cured, the lid 23 of the repair jig 2 is separated from the repair location 12 of the pipe 11 by using the hook-shaped auxiliary tool 4 as shown in FIGS. 5 and 6. Can be removed from. As described above, when the lid body 23 is removed, the valve 222a of the repair jig 2 is closed. Since the spray repair material 1 has already hardened, it does not break even when the valve 222a is closed, and fluid leakage can be prevented.

The saddle-shaped auxiliary tool 4 will be described. As shown in FIGS. 11 to 14, the hook-shaped auxiliary tool 4 includes a hook part 43 and a grip part 44 disposed on the tip part 42 of the hook part 43. The grip part 44 includes a first arm 441a and a second arm 441b. The first arm 441a and the second arm 441b operate the operating portion (not shown) disposed on the base end portion 41 of the collar portion 43 to displace the operating portion 448 to the base end side, thereby causing the first arm 441a. And the tip of at least one of the second arms 441b is displaced so as to approach the tip of the other arm. When operating the operation unit, it is preferable to hold the gripping part disposed on the base end part 41 of the collar part 43 with one hand and operate the operation part with the other hand.

Specifically, as shown in FIG. 11, the flange portion 43 is inserted into the cylindrical member 442 and includes a first link arm 443 a and a second link arm 443 b that protrude from the cylindrical member 442. The first link arm 443a and the first arm 441a are connected to a third link arm 444a whose one end and the other end are pivotally supported by both members. Similarly, the second link arm 443b and the second arm 441b are connected to a fourth link arm 444b whose both ends are pivotally supported by both members.

A base end of the first arm 441 a and a base end of the second arm 441 b are pivotally supported by a shaft 445 so as to be swingable with respect to the flange portion 43. And the collar part 43 is hollow shape, and the wire is passed through the inside. One end of the wire is connected to an operation unit (not shown), and the other end of the wire is connected to the operation unit 448. The operating portion 448 is provided with a shaft 445. For this reason, as shown by a broken line in FIG. 12, when the operation unit is operated and the wire is pulled to the proximal end side, the operating unit 448 is displaced together with the shaft 445 to the proximal end side of the flange portion 43. The distal end side of the third link arm 444a and the distal end side of the fourth link arm 444b are displaced to the inner side and the proximal end side of the gripping portion 44 in conjunction with the movement of the shaft 445 on the distal end side of the flange portion 43 to the proximal end side. At the same time, the distal end side of the first arm 441 a and the distal end side of the second arm 441 b are also displaced inside the grip portion 44. By this operation, the check valve 22 or the lid body 23 can be gripped as shown in FIG.

If the operation of gripping the hook-shaped auxiliary tool 4 is used, as shown in FIGS. 2 and 6, the operation of attaching the repair jig 2 to the pipe 11 or removing the lid 23 from the check valve 22 is performed. It becomes possible to perform more smoothly.

As shown in FIG. 13, grip portions 445a and 445b are disposed on the distal end side of the first arm 441a and the distal end side of the second arm 441b. The grip portions 445a and 445b are made of an elastic material made of an elastomer such as natural rubber or synthetic rubber. In the grip portions 445a and 445b, the surfaces that come into contact with the member to be gripped are recessed portions 446a and 446b that are recessed along the direction in which the first arm 441a or the second arm 441b extends. Providing the recesses 446a and 446b increases the area where the grip portions 445a and 445b are in contact with the outer periphery of the check valve 22, so that the check valve 22 or the lid 23 gripped from the grip portions 445a and 445b is not easily slipped off. It has become.

The grip portions 445a and 445b can rotate about the screws 447a and 447b. Since the grip portions 445a and 445b are fixed to the first arm 441 or the second arm by screws 447a and 447b, the grip portions 445a and 445b can be rotated by loosening the respective screws. This makes it possible to finely adjust the angles of the grip portions 445a and 445b so that the repair jig 2 can be easily attached to the repair spot 12 in the positional relationship between the worker 8 and the repair spot 12, and the repair jig during the work. 2 can be securely gripped.

As described above, according to the repair method of the present embodiment, when the repair jig 2 is temporarily fixed to the repair site of the pipe 11, the spray repair material 1 is sprayed onto the repair site of the pipe 11, the repair jig 2. When performing any of the steps when closing the valve 222a, the operator 8 can work from a remote location without approaching the repair location 12. Since the worker 8 is not exposed to the harmful fluid flowing inside the pipe 11, the worker 8 can safely perform the repair. In addition, even when the repair location 12 is at a high place, the worker 8 does not have to work close to the repair location 12, so that repair work such as omitting the construction of a scaffold or requiring a lower scaffold is sufficient. It becomes possible to carry out simply.

The length of the hook-shaped repair tool 4 and the hollow tube 52 can be set to an arbitrary length. If the pipe 11 of the steelworks is to be repaired, for example, the length of the bowl-shaped repair tool 4 can be about 1 to 10 m or about 1 to 5 m.

In the repair method according to the above-described embodiment, an example in which a gas circulates inside the pipe is given. The fluid may be a liquid. Any check valve may be used as long as it has a built-in valve and can switch the discharge of fluid. The attachment portion may be attached to the pipe and may have any shape that allows the repair jig to be attached by spraying the spray repair material. The lid may be attached to the check valve and may have any shape that can open the valve.

DESCRIPTION OF SYMBOLS 11 Piping 2 Repair jig 21 Attachment part 22 Check valve 1 Spraying repair material 12 Repair location 51 Grip part 23 Lid 24 Retractable part

Claims (10)

A method for repairing a pipe carrying a fluid,
In the method, a repair jig having a mounting portion for piping and a check valve protruding from the mounting portion, and a spray repair material are used,
Attach the repair jig with the valve opened from the place away from the pipe repair point to the pipe repair point via the mounting part,
Spray spray repairing material on the mounting part and the repaired part of the pipe from a place away from the repaired part of the pipe,
A repair method for piping that closes the valve of the repair jig from a location away from the repair location of the piping after the spray repair material has hardened. The repair jig further includes a lid in addition to the check valve, and the valve is opened by attaching the lid to the check valve. Repair method. At least one of the lid and the check valve constituting the check valve of the repair jig includes a magnet,
The pipe repairing method according to claim 1 or 2, wherein a lid is fixed to the check valve by the magnet, whereby the valve is opened. The repair jig includes a check valve and a retractable portion made of an elastic material, and the angle of the attachment portion with respect to the check valve can be adjusted by the tiltable portion. Repair method for piping as described in 1. The check valve has an exhaust hole on the tip side, and the exhaust hole is covered with the cover body in a state where the cover body is fixed to the check valve.
The pipe repair method according to claim 2, wherein the fluid inside the pipe leaks from between the lid and the check valve. The pipe repairing method according to any one of claims 1 to 5, wherein the mounting portion for the pipe is made of a flexible flat material. The repairing tool according to any one of claims 1 to 6, wherein the repairing jig is attached to the repaired part from a place away from the repaired part of the pipe using a hook-shaped auxiliary tool. The pipe repairing method according to any one of claims 2 to 7, wherein the lid of the repair jig is removed from the check valve from a location away from the repair location of the piping by using a hook-shaped auxiliary tool. The spraying repair material is sprayed from the tip of the hollow tube having the gripping part to the repaired part in the process of spraying the spraying repairing material from the position away from the repaired part of the pipe to the mounting part and the repaired part of the pipe. The pipe repair method according to claim 1, wherein the pipe is sprayed. The repair method for piping according to any one of claims 1 to 9, wherein the spray repair material includes an elastic synthetic resin powder, a hydraulic material powder, and water.

Images