JP2021121752A - Piping repair device - Google Patents

Abstract

To provide a piping repair device which can repair piping before a hole is formed at the piping.SOLUTION: A piping repair device 10 arranged in piping P comprises; a coating member 11 having an accommodation space 11h in which the piping P is accommodated, the accommodation space 11h being formed into a size in which a clearance is formed between an inner face 12a and an outer face Pa of the piping P in a state of accommodating the piping P; and a pair of seal parts 15 arranged between the inner face 12a of the accommodation space 11h of the coating member 11 and the outer face Pa of the piping P at both end parts 11a, 11a of the coating member 11 in an axial direction of the piping P in a state that the piping P is arranged in the accommodation space 11h of the coating member 11. The coating member 11 is formed of a pair of separable clamp members 12, 12 in which the accommodation space 11h is formed between inner faces 12a when being arranged so as to sandwich the piping P.SELECTED DRAWING: Figure 1

Description

The present invention relates to a piping repair device.

In a plant that extracts metal from ore or a plant such as cement, a slurry in which a solid substance is mixed in a liquid is generated, and a large number of pipes for transporting this slurry are provided. A metal pipe is usually used for the pipe that conveys this slurry, but since the metal pipe comes into contact with the solid matter in the slurry, the inside of the pipe wears over time and the thickness of the pipe becomes thick. Is decreasing. Therefore, in the pipes that convey the slurry, the wall thickness of the pipes is measured regularly to repair the damaged pipes, and the pipes with large damages are regularly replaced.

However, since it is usually necessary to shut down the plant to repair or replace the pipe, it may not be possible to immediately repair or replace the pipe. Then, in the portion where the wall thickness is reduced, there is a case where a hole is formed in the pipe and slurry or the like leaks out before the pipe is repaired or replaced. When a slurry leaks, liquids such as slurry may scatter around the piping, which may contaminate or damage the facilities around the piping. In particular, if the slurry is hot or contains a corrosive liquid, the damage to the facilities around the pipe will be large.

As a method for repairing a pipe having a hole, the methods described in Patent Documents 1 and 2 have been developed. In each of the methods of Patent Documents 1 and 2, the holes are closed by a method such as covering a portion of the pipe with a hole with a sheet to prevent liquid or the like from leaking from the hole.

Japanese Unexamined Patent Publication No. 2006-329249 Japanese Unexamined Patent Publication No. 2018-135962

By the way, the methods of Patent Documents 1 and 2 only close the hole of the pipe after the hole is formed in the pipe, and the liquid flowing through the pipe leaks until the hole is discovered and repaired. It will occur. In order to quickly repair a pipe when a hole is formed in the pipe, it is necessary to inspect the pipe daily or in a short inspection span. However, large plant equipment may have pipes installed over several kilometers, making it difficult to inspect all of these pipes daily or in short inspection spans. If the discovery of the formation of the hole is delayed and the transportation of the liquid or the like is continued in the situation where the hole is formed in the pipe, the hole of the pipe may be enlarged by the liquid or the like. Therefore, it is desired to repair the pipe before the hole is formed in the pipe so that the liquid does not leak to the surroundings even if the hole is formed in the pipe.

In view of the above circumstances, an object of the present invention is to provide a pipe repair tool capable of repairing a pipe before a hole is formed in the pipe.

The pipe repair equipment of the first invention is a pipe repair equipment installed on a pipe, has a storage space for accommodating the pipe, and forms a gap between the inner surface and the outer surface of the pipe in the state where the pipe is housed. With the covering member formed to the size to be formed and the piping arranged in the accommodating space of the covering member, the inner surface of the accommodating space of the covering member and the piping at both ends of the piping of the covering member in the axial direction. A pair of seal portions provided between the outer surface and the inner surface thereof, and the accommodating space is formed between the inner surfaces when the covering member is arranged so as to sandwich the pipe. It is characterized in that it is formed by a clamp member.
In the first invention, the pipe repair device of the second invention includes a lining provided on the surface of the pipe so as to cover the periphery of the pipe, and a seal member provided around the lining. The pair of seal portions are arranged so that a portion where the surface of the pipe is exposed is provided between the linings of the pair of seal portions, and the lining of each seal portion has an outer edge covering the coating. It is characterized in that it is provided so as to be located outside the edge of the member.
In the first or second invention of the pipe repair device of the third invention, the covering member is formed with a communication hole for communicating between the inside and the outside of the accommodation space, and the communication hole is formed with the communication hole. It is characterized in that a pressure gauge for measuring the pressure in the accommodation space is provided.
In the first, second or third invention of the piping repair device of the fourth invention, the covering member is formed with a communication hole for communicating between the inside of the accommodation space and the outside, and the communication hole is formed with the communication hole. Is characterized in that a valve for shutting off communication between the inside of the accommodation space and the outside is provided.
The pipe repair tool of the fifth invention is characterized in that, in the first, second, third or fourth invention, the communication hole is a liquid discharge hole for discharging the liquid leaked into the accommodation space.

According to the first invention, if a pair of sealing portions are arranged between the pair of clamp members of the covering member and the pipe and the covering member is attached to the pipe, the pipe can be covered by the covering member. Then, even if there is a hole in the part covered by the covering member in the pipe, the liquid leaked from the pipe can be held in the accommodation space, so that the liquid or the like in the pipe can be prevented from leaking or scattering to the surroundings. ..
According to the second invention, since the lining is provided on the pipe and the lining extends to the outside from the end of the covering member, even if the liquid or the like in the pipe leaks into the accommodation space, the lining extends to the outside. It becomes easy to prevent liquid or the like from leaking between the covering member and the pipe.
According to the third invention, since it is possible to grasp that the liquid or the like in the pipe has leaked into the accommodation space from the pressure fluctuation in the accommodation space, it is possible to grasp the damage of the pipe even when the pipe is covered.
According to the fourth invention, since the gas in the accommodating space can be discharged or the gas can be supplied into the accommodating space by opening the valve, it is possible to suppress erroneous detection and omission of detection of pipe damage due to temperature change.
According to the fifth invention, since the leaked liquid can be discharged into the accommodation space, the leak of the liquid can be surely grasped.

(A) is a schematic side view of the pipe repair tool 10 of the present embodiment, and (B) is a schematic plan view of the pipe repair tool 10 of the present embodiment. (A) is a schematic cross-sectional view of the pipe repair tool 10 in line IIA-IIA of FIG. 1 (B), and (B) is a schematic cross-sectional view of line BB of (A). (A) is a schematic side view of the pipe repair tool 10 of another embodiment, and (B) is a schematic plan view of the pipe repair tool 10 of another embodiment.

The pipe repair device of the present embodiment is a device for repairing a pipe that conveys a slurry or the like, and is installed in the pipe before the pipe is damaged.

The piping in which the piping repair equipment of the present embodiment is used is not particularly limited, and for example, the leachate residue slurry generated when valuable metal is leached from nickel oxide ore with an acid or the like and recovered is used in a slag dam, a reservoir, or the like ( It can be used for repairing pipes for transporting slurries and liquids such as cement slurries in pipes to be sent to dams and the like and plants for cement and the like. In particular, it is difficult (or necessary) to repair a large-diameter pipe (for example, a steel pipe of 10 to 18 inches) or to provide a cover or the like that is in close contact with the circumference of the pipe such as a bent pipe (for example, an elbow part). It is suitable for repairing pipes (which takes a lot of time and effort when installing a cover).

<Piping repair device 10 of this embodiment>
As shown in FIGS. 1 and 2, the pipe repair tool 10 of the present embodiment is a member attached to the pipe P so as to cover the outer surface Pa of the pipe P. The pipe repair device 10 includes a covering member 11 attached so as to cover the outer surface Pa of the pipe P, and a pair of sealing portions 15 and 15 for sealing between the covering member 11 and the outer surface Pa of the pipe P. There is.

<Coating member 11>
As shown in FIG. 2A, the covering member 11 has an accommodation space 11h capable of accommodating the pipe P inside. The covering member 11 is formed by combining a pair of clamp members 12, 12. Specifically, the clamp member 12 is provided at both ends of the tubular portion 12p formed in a shape matching the shape of the pipe P on which the covering member 11 is installed and the tubular portion 12p along the axial direction. A pair of flange portions 12f and 12f are provided.

The tubular portion 12p is provided so that the shape in a plan view is the same as the shape in a plan view of the pipe P to which the covering member 11 is attached. For example, if the plan view shape of the pipe P is linear, the tubular portion 12p is also formed linearly (see FIG. 1). Further, if the plan view shape of the pipe P is curved, the tubular portion 12p is also formed to be curved at the same angle and radius of curvature as the pipe P (see FIG. 3B). The plan view shape referred to here means a shape viewed from a direction orthogonal to the plane including the central axis of the pipe P.

Further, as shown in FIG. 2B, the tubular portion 12p is formed so that its inner surface 12a is substantially semicircular in its cross-sectional shape. Moreover, the tubular portion 12p is formed so that the radius of curvature R1 of the inner surface 12a is longer than the distance R2 from the central axis of the pipe P to the outer surface Pa. That is, when the covering member 11 is attached to the pipe P, the tubular portion 12p has a size such that a gap is formed between the inner surface of the covering member 11 (inner surface 12a of the clamp member 12) and the outer surface Pa of the pipe P. Is formed.

As shown in FIGS. 1 and 2B, the pair of flange portions 12f and 12f are provided at the pair of end portions of the tubular portion 12p along the axial direction, respectively. The pair of flange portions 12f and 12f are plate-shaped portions provided so as to stand on the outer surface of the pair of end portions of the tubular portion 12p. Then, the pair of flange portions 12f and 12f are combined with the pair of clamp members 12 and 12 so that their inner surfaces 12a face each other, and the pair of flange portions 12f and 12f of the other clamp member 12 and bolts or the like are used. It is provided so that it can be connected. That is, if the pair of clamp members 12 and 12 are connected to each other by connecting the pair of flange portions 12f and 12f to each other, the pair of clamp members 12 and 12 can be connected in a state where the accommodation space 11h is formed between the inner surfaces 12a.

When connecting the pair of clamp members 12 and 12, a flange in which a rubber packing 13 or the like is arranged between the pair of flange portions 12f and 12f and the accommodation space 11h and the outside are connected to each other. It is designed so that the portions 12f do not communicate with each other. That is, the gap between the pair of flange portions 12f and 12f is hermetically sealed by the rubber packing 13 or the like.

<A pair of seal parts 15, 15>
As shown in FIGS. 1 and 2, the pair of sealing portions 15 and 15 are provided between the inner surface 12a of the covering member 11 and the outer surface Pa of the pipe P at both ends in the axial direction of the covering member 11. The pair of sealing portions 15 and 15 are formed by laminating the lining 16 and the sealing member 17. Both the lining 16 and the sealing member 17 are made of a flexible and elastic material. The thickness of the pair of sealing portions 15 and 15 is the difference between the radius of curvature R1 of the inner surface 12a of the pair of clamp members 12 and 12 and the distance R2 from the central axis of the pipe P to the outer surface Pa (hereinafter referred to as the difference Da). It is longer than (there is). That is, the thickness of the lining 16 and the seal member 17 laminated is formed to be longer than the difference Da when no compressive force is applied to the lining 16 and the seal member 17 from the stacking direction. There is. Therefore, if the pair of sealing portions 15 and 15 are arranged between the outer surface Pa of the pipe P and the pair of clamp members 12 and 12, the accommodation space 11h can be airtightly and liquidtightly isolated from the outside. ing. In other words, the pipe P in the accommodation space 11h can be airtightly and liquidtightly isolated from the outside.

The pair of seal portions 15, 15 will be described in detail.
As shown in FIGS. 1 and 2, the pair of seal portions 15 and 15 each include a lining 16 provided so as to be in close contact with the outer surface Pa of the pipe P. In the lining 16 of the pair of sealing portions 15 and 15, the distance L2 between the outer ends of the lining 16 is longer than the axial length L1 of the covering member 11 in the axial direction of the pipe P, and the distance between the inner ends of the lining 16 is longer. The distance L3 is shorter than the axial length L1 of the covering member 11 (see FIG. 2A). That is, the pair of seal portions 15 and 15 are provided so that when the covering member 11 is attached to the pipe P, the linings 16 of the pair of sealing portions 15 and 15 are located at both ends of the covering member 11 in the axial direction. Has been done. The lining 16 is, for example, a resin sheet having flexibility and elasticity, and is attached to the outer surface Pa of the pipe P so as to cover the outer surface Pa of the pipe P. The material of the lining 16 is not particularly limited as long as it has flexibility and elasticity, but for example, butyl rubber (hardness: 40 ± 5 shore-hardness), natural rubber resin, Teflon (registered trademark), etc. are used for piping. It is desirable because the adhesion of P to the outer surface Pa can be increased.

Further, as shown in FIGS. 1 and 2, the pair of seal portions 15 and 15 have a seal member 17 provided between the surface of the lining 16 and the inner surface of the axial end portion of the pair of clamp members 12 and 12. doing. The seal member 17 is, for example, a resin sheet having flexibility and elasticity, and is attached to the outer surface Pa of the pipe P so as to cover the surface of the lining 16. The material of the sealing member 17 may be any material having flexibility and elasticity, and is not particularly limited. For example, a resin such as butyl rubber or Teflon (registered trademark) is used as a pair of clamp members 12 with the surface of the lining 16. It is desirable because the sealing property with the inner surface of the end portion in the axial direction of 12 can be improved.

<About the installation of the piping repair tool 10 of this embodiment>
Since the pipe repair tool 10 of the present embodiment has the above configuration, the pipe repair tool 10 should be installed on the pipe P so as to cover the pipe P which may be damaged if the following is performed. Can be done.

First, the lining 16 of the pair of seal portions 15 and 15 is provided on the outer surface of the pipe P so as to sandwich the portion of the pipe P where damage may occur. At this time, in the axial direction of the pipe P, the distance L2 between the outer ends of the linings 16 of the pair of seal portions 15 and 15 becomes longer than the axial length L1 of the covering member 11, and the distance between the inner ends of the linings 16 is longer. The distance L3 is provided so as to be shorter than the axial length L1 of the covering member 11 (see FIG. 2A). The method of providing the lining 16 on the pipe P is not particularly limited, and for example, the lining 16 may be provided on the pipe P with an adhesive.

When the lining 16 is provided, the pair of clamp members 12 and 12 are arranged so as to sandwich the pipe P. At this time, the seal member 17 is arranged so as to sandwich the seal member 17 between both ends of the pair of clamp members 12 and 12 and each lining 16.

Then, if the rubber packing 13 is arranged between the flange portions 12f of the pair of clamp members 12 and 12 facing each other and the flange portions 12f facing each other are connected to each other, the pair of clamp members 12, 12, that is, The covering member 11 of the pipe repair device 10 can be attached to the pipe P in a state where a portion of the pipe P that may be damaged is housed in the accommodation space 11h.

At this time, the linings 16 and the seal members 17 of the pair of seal portions 15 and 15 are sandwiched and compressed between both ends of the pair of clamp members 12 and 12 and the outer surface Pa of the pipe P. Therefore, the portion of the pipe P that may be damaged in the accommodation space 11h of the covering member 11 can be isolated from the outside by the pipe repair tool 10.

If the pipe repair device 10 is attached to the pipe P as described above, even if there is a hole in the part where the pipe P may be damaged, that is, the part covered by the covering member 11 of the pipe repair tool 10. The liquid or the like leaking from the pipe P can be held in the accommodation space 11h. Then, even if the pipe P is damaged, it is possible to prevent the liquid or the like in the pipe P from leaking or scattering to the surroundings.

Moreover, since the covering member 11 itself is not brought into close contact with the outer surface of the pipe P, the portion of the pipe P where damage may occur is externally formed even if the processing accuracy of the pair of clamp members 12 and 12 of the covering member 11 is not improved so much. Can be isolated from.

<Communication hole 12g>
In the pipe repair tool 10 of the present embodiment, there is a gap between the pair of seal portions 15 and 15 between the outer surface of the pipe P and the inner surface 12a of the tubular portion 12p of the pair of clamp members 12 and 12 of the covering member 11. It is formed. This gap, that is, a communication hole 12g penetrating between the accommodation space 11h and the outside may be provided in the tubular portion 12p (FIG. 3A).

As shown in FIG. 3A, a pressure gauge 14a for measuring the pressure inside the covering member 11 (that is, the pressure in the accommodation space 11h) may be provided in the communication hole 12g. If the pressure in the accommodation space 11h can be grasped, it can be detected that the pipe P is damaged (for example, there is a hole) and the liquid leaks at the portion of the pipe P covered with the covering member 11. That is, when the liquid leaking from the pipe P enters the accommodation space 11h, the gas in the accommodation space 11h is compressed. Therefore, if the increase in pressure of the pressure gauge 14a is detected, it can be grasped that the pipe P is damaged. If the pressure signal detected by the pressure gauge 14a is transmitted wirelessly or by wire to a remote management center or the like, damage to the pipe P can be detected even if the pipe P is located at a remote location.

On the other hand, when the air in the accommodation space 11h is heated by the temperature rise around the covering member 11 or the heat of the liquid flowing in the pipe P, the pressure in the accommodation space 11h also increases. That is, even if the air in the accommodation space 11h is heated and the pressure detected by the pressure gauge 14a rises, it may be mistaken that the pipe P is damaged. Therefore, in order to confirm whether or not the pipe P is actually damaged and a liquid leak occurs, a communication hole 12g is provided separately from the communication hole 12g provided with the pressure gauge 14a, and a drain valve is provided in the communication hole 12g. 14c may be provided. In this case, the communication hole 12g is arranged so as to be located below the pipe P. Then, if the drain valve 14c is opened after detecting the increase in the pressure of the pressure gauge 14a, if the pipe P is actually damaged and a liquid leak occurs, the leaked liquid will flow out from the drain valve 14c. Therefore, damage to the pipe P can be confirmed. On the other hand, if the liquid does not come out even when the drain valve 14c is opened, it can be understood that the pressure in the accommodation space 11h has increased not because the pipe P has been damaged but because the air in the accommodation space 11h is simply heated. The communication hole 12g provided with the drain valve 14c corresponds to the liquid discharge hole in the claims.

If the pressure in the accommodation space 11h rises due to heating of the air in the accommodation space 11h, the drain valve 14c can be opened to check for liquid leakage, and the air in the accommodation space 11h can be drained. It flows out through 14c. Then, the pressure in the accommodation space 11h can be returned to the normal pressure. On the other hand, a communication hole 12g may be provided separately from the communication hole 12g provided with the pressure gauge 14a and the drain valve 14c, and the ventilation valve 14b may be provided in the communication hole 12g. When the vent valve 14b is provided, there is an advantage that the air in the storage space 11h can be reliably discharged as compared with the case where the drain valve 14c is opened to return the pressure in the storage space 11h to a normal pressure. That is, if a very small amount of leaking slurry or the like is accumulated and clogged by the drain valve 14c installed below, there is a possibility that the air in the storage space 11h cannot be discharged normally even if the drain valve 14c is opened. There is. However, if the ventilation valve 14b provided above is provided, the air in the storage space 11h can be reliably discharged even in a situation where the drain valve 14c is clogged.

<About a pair of clamp members 12, 12>
The difference between the radius of curvature R1 of the inner surface 12a of the pair of clamp members 12 and 12 and the distance R2 from the central axis of the pipe P to the outer surface Pa is not particularly limited. For example, if the difference R1-R2 between the two is about 8 to 13% of the distance R1, when the covering member 11 is attached to the pipe P, the inner surface of the covering member 11 (inner surface 12a of the clamp member 12) An appropriate gap can be formed between the pipe P and the outer surface Pa.

Further, in the tubular portion 12p, when the pair of clamp members 12 and 12 are combined, the cross-sectional shape of the accommodation space 11h formed between the inner surfaces 12a thereof is substantially similar to the cross-sectional shape of the pipe P. It does not have to be substantially semicircular as long as it is formed. That is, the cross-sectional shape of the accommodation space 11h does not necessarily have to be circular. Further, if a gap can be formed between the inner surface 12a of the pair of clamp members 12 and 12 and the outer surface Pa of the pipe P, the cross-sectional shape of the accommodation space 11h is not necessarily substantially similar to the cross-sectional shape of the pipe P. May be good.

<About the seal part 15>
The distance L2 between the axial outer ends of the lining 16 may be substantially the same as the axial length L1 of the covering member 11. However, as described above, if the distance L2 between the axial outer ends of the lining 16 is longer than the axial length L1 of the covering member 11, the outer edge of the lining 16 of each sealing portion 15 is the covering member 11. Will be located outside the axial edge of. Then, even if the liquid or the like in the pipe P leaks into the accommodation space 11h, it becomes easy to prevent the liquid or the like from leaking from between the covering member 11 and the outer surface Pa of the pipe P.

Further, the width of the seal member 17, that is, the axial length of the pipe P of the seal member 17 is not particularly limited, but is shorter than the width of the lining 16, that is, the axial length of the pipe P of the lining 16. It is desirable to be there. With such a configuration, even if the liquid or the like in the pipe P leaks into the accommodation space 11h, it becomes easier to prevent the liquid or the like from leaking from between the seal member 17 and the lining 16.

Further, the seal portion 15 may have both the lining 16 and the seal member 17, or may have only one of them. That is, the seal portion 15 may be composed of only the lining 16 or only the seal member 17. However, if the sealing portion 15 has both the lining 16 and the sealing member 17, the degree of adhesion (sealing property) between the inner surface of the covering member 11 (inner surface 12a of the clamp member 12) and the outer surface Pa of the pipe P. Is preferable in that

It was confirmed that liquid leakage can be prevented by installing the pipe repair tool of the present invention on a steel pipe (18 inches).

In the embodiment, a pair of clamp members are installed so as to sandwich the steel pipe. As the sealing member, a rubber lining (butyl rubber: thickness 5 mm) was applied to the surface of the steel pipe, and a sealing member (butyl rubber: thickness 15 mm) was provided between the rubber lining and the pair of clamp members. In this state, when water pressure (150 KPaG) was applied to the accommodation space between the pair of clamp members and the pipe from the air bleeding pipe (corresponding to the ventilation valve of the present application) provided in the clamp member, water was released for 30 minutes. We were able to maintain a leak-free condition.

On the other hand, when the same experiment was performed with the rubber lining removed from the above embodiment, water leakage occurred from the circumferential gap between the pair of clamp members and the steel pipe.

The pipe repair tool of the present invention is suitable for repairing large-diameter pipes and bent pipes.

10 Piping repair equipment 11 Coating member 11h Accommodation space 12 Clamp member 12a Inner surface 12h Communication hole 14a Pressure gauge 14b Vent valve 14c Drain valve 15 Seal part 16 Lining 17 Seal member P Piping Pa Outer surface

Claims (5)

It is a pipe repair tool installed in the pipe,
A covering member having a storage space for accommodating the pipe and having a size such that a gap is formed between the inner surface and the outer surface of the pipe in the state where the pipe is housed.
A pair of seal portions provided between the inner surface of the accommodating space of the covering member and the outer surface of the piping at both ends in the axial direction of the piping of the covering member in a state where the piping is arranged in the accommodating space of the covering member. And, equipped with
The covering member
A pipe repair instrument characterized in that it is formed by a pair of clamp members that are separable from each other, in which the accommodation space is formed between inner surfaces when arranged so as to sandwich the pipe. Each seal part
A lining provided on the surface of the pipe so as to cover the circumference of the pipe,
It is provided with a sealing member provided around the lining.
The pair of seals
It is arranged so that a portion where the surface of the pipe is exposed is provided between the linings of the pair of seal portions.
The lining of each seal is
The pipe repair device according to claim 1, wherein the outer edge thereof is provided so as to be located outside the edge of the covering member. The covering member has
A communication hole is formed to communicate between the inside of the accommodation space and the outside.
The pipe repair device according to claim 1 or 2, wherein the communication hole is provided with a pressure gauge for measuring the pressure in the accommodation space. The covering member has
A communication hole is formed to communicate between the inside of the accommodation space and the outside.
In the communication hole,
The pipe repair device according to claim 1, 2 or 3, wherein a valve for shutting off communication between the inside of the accommodation space and the outside is provided. The communication hole
The pipe repair device according to claim 1, 2, 3 or 4, characterized in that it is a liquid discharge hole for discharging the liquid leaked into the accommodation space.

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