JP2000310388A - Repairing device of pipe leaking part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid leakage of a filler at the time of injection on a device to repair a pipe leaking part by using the filler. SOLUTION: A cover 10 is made of a pair of half bodies 11A, 11B. These half bodies 11A, 11B are connected to each other by covering a leaking part 4a of a pipe 2. The half bodies 11A, 11B respectively have a pair of semi-circular sealing parts 14, 15. A plural number of projections 14a, 15a respectively extending in the peripheral direction are aligned in the axial direction and integrally formed on these sealing parts 14, 15. The projections 14a and the projections 15a of these half bodies 11A, 11B ranges each other respectively. A filler 30 is filled from injection holes 18a-18d and solidified in a space 40 between the cover 10 and the pipe 2. This solidified filler 30 blocks the leaking part 4a. The filler to be injected avoids outward leakage by the projections 14a, 15a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for repairing a pipe by covering a leaked portion of the pipe with a cover, and filling a gap between the cover and the pipe with a filler.

[0002]

2. Description of the Related Art When small scratches occur in piping of a power plant or the like,
Until this pipe is replaced or permanent measures are taken, leakage of fluid from the wound is prevented, and operation is continued. A conventional device for repairing this wound or leak is provided with a cover consisting of a pair of halves. The pair of halves are applied to the outer periphery of the pipe having the leak portion, and are connected to each other to be attached to the pipe. Then, a filler is injected into a space formed between the cover and the pipe from an injection hole formed in one of the half bodies or both the half bodies, and solidified. Close leaks.

[0003] When the filler is injected, it is necessary to block the space between the pipe and the cover from the outside so as to prevent the filler to which the injection pressure is applied from leaking to the outside. Conventionally, for example, a band-shaped sealing material made of lead or the like is wound around two locations on the outer periphery of the pipe with the leaking portion interposed therebetween, and the pair of halves are connected to the outside of the sealing material and connected.

[0004]

With the above-mentioned sealing material, the winding around a pipe requires skill and the sealing performance is not high.

[0005]

According to a first aspect of the present invention, there is provided:
A cover consisting of a pair of halves is attached to the pipe so as to connect the halves together and cover the leaking part of the pipe, and is provided inside at least one half so as to surround the leaking part. The sealed portion was substantially brought into contact with the outer peripheral surface of the pipe, whereby the leaked portion was shut off from the outside, and a filler was injected from an injection hole formed in the cover to be surrounded by the seal portion. In a repair device for a pipe leaking portion that is filled and solidified in a space and the leaked portion is closed with the solidified filler, the seal portion is made of a material softer than the pipe and integrally has a plurality of protrusions. The projections extend along the boundary of the space and are arranged in a direction intersecting the extending direction.

According to a second aspect of the present invention, in the apparatus for repairing a pipe leakage portion according to the first aspect, the protrusions have a triangular cross section, and the sharpened tips of the protrusions are in contact with the outer peripheral surface of the pipe. . According to a third aspect of the present invention, in the repairing device for a pipe leakage portion according to the first or second aspect, the outer peripheral portion of the seal portion and the outer peripheral portion of the half body of the cover are made of different materials. It is characterized by being harder. According to a fourth aspect of the present invention, in the repairing device for a pipe leaking portion according to the first to third aspects, each half of the cover is provided with a pair of semi-ring-shaped seal portions separated from each other, In the connected state of the halves, the projections of these half-ring shaped seal portions are connected to form a pair of ring-shaped seal portions,
A space surrounding the leakage portion is formed by the pair of ring-shaped seal portions.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, a drain pipe 2 (pipe) is connected to the feed water heater 1. The drain pipe 2 is connected to a cylindrical seat 3 fixed to the feed water heater 1, a straight pipe 4 having an upper end inserted and fixed to the seat 3 and extending downward, and a lower end of the straight pipe 4. An elbow pipe 5 and a straight pipe 6 extending horizontally from the elbow pipe 5 are included.

A repair device for repairing a flaw 4a (leakage portion) generated in the straight pipe 4 will be described in detail. As shown in FIGS. 1, 2, and 5, the repair device includes a cover 10 including a pair of semi-cylindrical half bodies 11A and 11B having the same shape (target shape), a bolt 21 and a nut 22. It comprises a connecting means 20 for connecting the half-split bodies 11A and 11B so as to be joined together, and a filler 30 filled between the cover 10 and the straight pipe 4.

Each of the half bodies 11A and 11B has a semi-cylindrical outer member 12 (the outer peripheral portion of the half member) and a semi-cylindrical inner peripheral member 13 (half part) fixed inside the outer member 12. (The inner periphery of the body). The outer peripheral material 12 is made of, for example, stainless steel or steel, and is made of the same material as the pipe 4. The inner peripheral member 13 is made of a material such as brass or annealed copper, and is much softer than the pipe 4 and the outer peripheral member 12 and easily deformed plastically.

The inner peripheral portions of the upper and lower ends (both ends in the axial direction) of the inner peripheral member 13 are semicircular (semi-ring shaped) seal portions 14 and 1.
It is 5. The inner diameter of the upper seal portion 14 is larger than the inner diameter of the lower seal portion 15 and is equal to the outer diameter of the seat 3. The inner diameter of the lower seal portion 15 is equal to the outer diameter of the straight pipe 4. These seal portions 14 and 15 have a plurality of projections 14a and 15a, respectively, integrally. These projections 14
a, 15a extend in a semicircular shape in the circumferential direction and are arranged in the axial direction. As best shown in FIG. 4, these projections 14a and 15a have a triangular cross section and an acute angle at the tip.

[0011] The inner peripheral member 13 has the seal portion 14,
A groove 16 extending in a semicircular shape in the circumferential direction is formed on the outer side in the axial direction of 15, and a packing 17 made of lead or the like is fitted in each groove 16. As shown in FIG. 1, two (plural) filler injection holes 18a and 18b are formed in the left half body 11A and are separated from each other in the axial direction. Similarly, the injection hole 18a,
Injection holes 18c and 18d are formed at the same height as 18b.

The injection holes 18a to 18d are formed in the inner
From the outer peripheral material 12. On the outer peripheral surface of the outer peripheral member 12, screw holes 19a to 19d connected to the injection holes 18a to 18d are formed. These screw holes 19a ~
A closing bolt 35 (closing plug) is screwed into 19d after the filling of the filling material 30 described later is completed.

A method for repairing a leaked portion by the apparatus having the above configuration will be described in detail. So as to cover the wound 4a of the straight pipe 4,
The cover 10 is attached to the pipe 2. That is, the half body 1
1A and 11B are joined together, and the half bodies 11A,
11B by tightening with a bolt 21 penetrating both ends in the circumferential direction and a nut 22 screwed to the bolt 21
The connection between 1A and 11B is performed.

Due to the above connection, both circumferential end surfaces of the half bodies 11A and 11B come into surface contact with each other, and the projections 14a of the semicircular seal portion 14 and the projections 15a of the seal portion 15 are connected to each other to form a pair of circular ( A ring-shaped) seal portion is formed. The protrusion 14a forming one circular seal portion contacts the outer peripheral surface of the seat 3, and the protrusion 15a forming the other circular seal portion contacts the outer peripheral surface of the straight pipe 4.

A cylindrical space 40 facing the wound 4a is formed between the cover 10 and the pipe 2. The space 40 has a circular seal portion formed by a pair of seal portions 14 on the upper side thereof. It is shielded from the outside by a circular seal portion composed of a pair of lower seal portions 15. In other words, the boundary of the space 40 is formed by the pair of circular seal portions.

The inner diameters of the projections 14a and 15a are equal to the outer diameters of the seat 3 and the straight pipe 4, respectively.
The tip of 15a should contact the outer peripheral surface of the seat 3 and the straight pipe 4. When there are minute irregularities on the outer peripheral surface of the seat 3 and the straight pipe 4, the half body 1 is fixed by the bolt 21 and the nut 22.
When squeezing so that 1A and 11B may be in contact with each other, the tips of projections 14a and 15a are crushed, and can be in good contact with the outer peripheral surfaces of seat 3 and straight pipe 4. The protrusions 14a, 1
5a is triangular and sharp and sharp, and is made of a material that is easily plastically deformed, so that the tip is easily crushed. Note that the left and right packings 17 forming a circle are also plastically deformed when the half bodies 11A and 11B are connected, and come into contact with the outer peripheral surfaces of the seat 3 and the straight pipe 4.

After the mounting of the cover 10 is completed as described above, the filling material 30 is injected. First, a screw hole 19b connected to the injection hole 18b farthest from the scratch 4a
, An auxiliary adapter (not shown) is screwed into the space, an injection gun (not shown) is inserted into the auxiliary adapter, and the filler 30 from the hydraulic pump is injected into the space 40 through the injection gun, the auxiliary adapter, and the injection hole 18b. I do. In addition, the filling material 30 is, for example, NB when heat resistance is required.
A material containing R (acrylonitrile butadiene rubber) as a main component is used, and when used at room temperature, a material containing natural rubber or butyl rubber as a main component is used. These materials are injected, for example, at a temperature of about 70 ° C. so as to have fluidity.

When the filler 30 is injected from the lower injection hole 18b in the left half 11A as described above, the filler 30 eventually overflows from the lower injection hole 18d in the right half 11B. Come out. At this time, the closing bolt 35 is screwed into the screw hole 19d connected to the injection hole 18d to close the injection hole 18d.

When the injection is further continued, the filler 30 eventually overflows from the upper injection hole 18a of the left half 11A. At this time, the injection hole 18a
The closing bolt 35 is screwed into the screw hole 19a connected to
The injection hole 18a is closed. At almost the same time, the injection of the filler 30 from the injection hole 18b is stopped, the cock of the auxiliary adapter is closed, and the injection gun is removed from the auxiliary adapter. The auxiliary adapter is left screwed into the screw hole 19b.

Next, the filler 30 is injected from the injection hole 18c closest to the flaw 4a. That is, another auxiliary adapter is screwed into the screw hole 19c, an injection gun is inserted into this auxiliary adapter, and the filler 30 is injected in the same manner as described above. As described above, the space 40 is filled with the filler 30, and the scratches 4 a are closed by the filler 3. Even after the space 30 is filled with the filler 30 and the injection is completed, the state where the injection pressure is applied to the filler 30 is maintained for a predetermined time, for example, 20 minutes with the injection gun attached.

Thereafter, the injection gun is pulled out, the cock of the auxiliary adapter in the screw hole 19c is closed, and left for several hours. Thereby, the filler 30 is solidified. Finally, screw hole 19
The auxiliary adapter is removed from b, 19c, and the closing bolt 35 is screwed into these screw holes 19b, 19c. The filling material 30 which has been filled and solidified in the space 40 as described above closes the flaw 4a, so that leakage of the fluid flowing through the pipe 2 can be eliminated.

According to the above embodiment, the plurality of projections 14
a and 15a are integrally formed on the halves 11A and 11B, and the seals 14 and 15 are formed on the halves 11A and 11B.
Because the projections 14a and 15a are brought into contact with the outer peripheral surface of the pipe 2 by the connection of, the space 40 facing the scratch 4a can be sealed by a simple operation without requiring skill.

The sealing action of the seal portions 14 and 15 will be described in detail. Since the tips of the projections 14a and 15a connected in a circle along the upper and lower boundaries of the space 40 are in contact with the outer peripheral surfaces of the seat 3 and the straight pipe 4, leakage of the filler 30 is prevented. Moreover, even if the filler 30 leaks beyond one peak of the projections 14a and 15a, the filler 3
0 is significantly reduced, so that the next peak 14
With a and 15a, it is possible to reliably prevent leakage.
In addition, the filler 30 that has exceeded the protrusions 14a and 15a is solidified and plays a role of sealing the filler 30 in the space 40, so that leakage can be more reliably prevented. Projections 14a, 15 even if there are irregularities on the outer peripheral surface of seat 3, straight pipe 4.
Since a part of the front end of “a” is crushed and comes into good contact with these outer peripheral surfaces, the sealing function can be further improved.

As described above, it is possible to reliably prevent the filler 30 to which the injection pressure has been applied from leaking from the seal portions 14 and 15. Further, since the leakage of the filler 30 can be prevented, a sufficient injection pressure can be applied to the filler 30, and the space 30 can be reliably filled with the filler 30. Leakage of the fluid flowing through can be more reliably prevented.

In the above embodiment, the projections 14a, 15
The inner diameter of a is slightly smaller than the outer diameter of the seat 3 and the straight pipe 4,
The distal ends of the projections 14a and 15a may be slightly crushed over substantially the entire circumference to come into contact with the outer peripheral surfaces of the seat 3 and the straight pipe 4. The filling of the filler 30 may be performed as follows. That is, an injection gun is inserted into the injection hole 18b and injected. The injection hole 18d, 18a, and 18c are closed by the closing bolts 35 every time the filler 30 overflows in this order. After the injection pressure is maintained for a predetermined time, the injection gun is withdrawn and the injection hole 18b is closed with the closing bolt 35.

The packing 17 is provided to further ensure the leakage of the filler 30.
When there are a large number of a and 15a as shown in the figure, they can be omitted. In the above embodiment, the half body 11A,
11B has the outer peripheral member 12 and the inner peripheral member 13 separately,
These may be integrally formed of brass or the like which is softer than the pipe.

Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment differs from the first embodiment in that the semicircular seal members 14 and 15 (seal portions) made of brass or annealed copper are formed of separate members and have the same inner diameter. The same is true. Halves 1
The bodies 110 of 1A and 11B (the bodies 110 include the outer peripheral portions of the half bodies 11A and 11B) are made of stainless steel or steel, and have grooves 111 that are spaced apart in the axial direction. The seal members 14 and 15 are fitted into the seal members. This embodiment is for repairing a leak portion of a straight pipe, and the seal members 14 and 15 are in contact with the outer peripheral surface of the straight pipe. Other configurations and operations are the same as those of the first embodiment, and the corresponding components are denoted by the same reference numerals and detailed description thereof will be omitted.

Next, a third embodiment of the present invention will be described with reference to FIG. When the diameter of the pipe 2 'is large, the half body 11A' of the cover 10 'has a pair of semicircular seal portions 14' separated in the axial direction, and between the seal portions 14 '. And a pair of linear seal portions 50 which are arranged in the circumferential direction and are spaced apart from each other in the circumferential direction. The other half body 11B does not have a seal portion. In this manner, the space 40 'can be narrowed, and the filling amount of the filler 30 can be reduced. The seal portion 14 'is formed by integrally forming a plurality of protrusions 14a' extending in the circumferential direction in the axial direction. The seal portion 50 is formed by integrally forming a plurality of protrusions 50a extending in the axial direction in the circumferential direction. These seal portions 14 ′, 50 are provided with the half bodies 11 A ′,
11B 'is a material that is separate from the main part (including the outer peripheral part) of 11B', and is similar to the first embodiment in that the material is easily plastically deformed. It is. In the third embodiment, a nut 19 'fixed to the half body 11A is formed as a screw hole connected to the injection hole 18'.
Is used. In FIG. 7, connection means including bolts and nuts are not shown.

A fourth embodiment shown in FIG. 8 will be described. In this embodiment, damage (leakage) of the packing 9 interposed between the flanges 8 for connecting the pipes 7 to each other in the pipe 2 ″ is repaired. The cover 10 "is composed of a pair of half bodies (only one half body 11A" is shown in FIG. 8), and each half body has a pair of seal portions 14 "which are easily plastically deformed inside thereof.
This seal portion 14 "has a plurality of projections 14a". Reference numeral 18 "denotes an injection hole, and 19" denotes a nut into which an auxiliary adapter or a closing bolt 35 is screwed. FIG.
However, illustration of bolts and nuts for connecting the half bodies is omitted.

The present invention can be applied to repair of a leaked portion generated in an elbow pipe or a trumpet pipe. In the case of a trumpet tube, the inner diameter of the projection of the seal portion gradually increases in the axial direction.
The cover may have a rectangular parallelepiped shape in a state where the pair of half bodies are joined. The half body may be formed of, for example, brass, and may have the seal portion and the outer peripheral portion integrally. In the specification of the present application, a thing interposed between pipes, such as a pump and a heat exchanger, is also defined as a pipe.

[0031]

As described above, according to the first aspect of the present invention, a seal portion integrally formed with a plurality of projections is provided on at least one half body, and by connecting the half bodies, Since these projections are in contact with the outer peripheral surface of the pipe, the space facing the leaking portion can be sealed by a simple operation without skill. Moreover, leakage of the filler can be reliably prevented by the plurality of protrusions.
In addition, sufficient injection pressure can be applied to the filler,
Since the space can be reliably filled with the filler, leakage of the fluid flowing through the pipe can be more reliably prevented. According to the second aspect of the present invention, since the projection has a triangular cross section and can be easily plastically deformed, the projection can be in good contact with the outer peripheral surface of the pipe, and the leakage of the filler can be further ensured. . According to the third aspect of the present invention, since the outer peripheral portion of the cover half body is hard, the mechanical strength can be increased. According to the fourth aspect of the present invention, it is possible to prevent leakage of a cylindrical portion of the pipe with a simple structure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a leak repairing device according to a first embodiment of the present invention.

FIG. 2 is a front view of the repair device as viewed from the same direction as FIG.

FIG. 3 is a side view of the left half body in FIG. 2 viewed from a direction III.

FIG. 4 is an enlarged sectional view of a seal portion of the half body.

FIG. 5 is a sectional view taken along line VV in FIG.

FIG. 6 is an exploded perspective view showing a leak repairing device according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a leak repairing device according to a third embodiment of the present invention.

FIG. 8 is a sectional view of a leak repairing device according to a fourth embodiment of the present invention.

[Explanation of symbols]

2 Piping 10, 10 ', 10 "Cover 11A, 11B, 11A', 11B ', 11A" Half body 12 Outer peripheral material (outer peripheral part) 14, 14', 14 ", 15, 50 Seal part 14a, 14a ', 14a ", 15a, 50a Projection 18a-18d, 18 ', 18" Injection hole 30 Filler

Claims (4)

[Claims] 1. A cover comprising a pair of halves is attached to a pipe so that the halves are connected to each other and covers a leak portion of the pipe, and the leak portion is provided inside at least one of the halves. The seal part provided so as to substantially surround the outer peripheral surface of the pipe so as to block the leakage part from the outside, and inject a filler through an injection hole formed in the cover to seal the seal. In a repair device for a pipe leaking part which is filled and solidified in a space surrounded by the part, and the solidified filler fills the leaking part, the seal part is made of a material softer than the pipe, and the plurality of protrusions are formed. Wherein the projections extend along the boundary of the space and are arranged in a direction intersecting the extending direction. 2. The apparatus according to claim 1, wherein the projections have a triangular cross section, and the sharp tips of the projections are in contact with the outer peripheral surface of the pipe. 3. The pipe leakage part according to claim 1, wherein the seal part and the outer peripheral part of the half body of the cover are made of different materials, and the outer peripheral part is harder than the seal part. Repair equipment. 4. A pair of half-ring-shaped seal portions separated from each other are provided on each half of the cover, and when the pair of half-pieces are connected, the projections of these half-ring-shaped seal portions are connected to each other. A pair of ring-shaped seal portions are formed in series, and the pair of ring-shaped seal portions form a space surrounding the leakage portion.
The repairing device for a pipe leakage part according to any one of claims 1 to 3.