JPH09243000A - Pipe inner surface inspection method and device - Google Patents

Abstract

(57) [Abstract] [Problem] When water 2 is accumulated in a pipe 1,
The water 2 is removed at the retention point, and the inner surface of the tube 1 is observed with a TV camera without being hindered by the water 2,
The condition of the inner surface of the tube 1 is inspected. SOLUTION: A television camera 6 is enclosed in a flexible tube 5 having airtightness, and a pressure fluid is fed into the tube 5 at a desired position in the tube 1 to inflate it and push water 2 away. While the tube 5 is pressed against the inner surface of the tube 1, the inner surface of the tube 1 is observed from the inside of the tube 5 with the television camera 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to pipes, especially gas conduits,
The present invention relates to a method and an apparatus for visually inspecting an inner surface of a pipeline mainly buried in the ground such as a water pipeline, a sewer pipeline, and a buried pipeline such as a power line and a communication line.

[0002]

2. Description of the Related Art When the underground buried pipeline as described above is damaged, when repairing the damage, the inner surface of the pipeline is inspected prior to the repair, and the damaged portion to be repaired. Need to be identified.

In order to inspect the inner surface of the pipeline, it is common to pass a television camera through the pipeline, photograph the inner surface of the pipeline with the TV camera, and visually inspect it with a monitor. When the water is accumulated, the water is agitated and turbid by passing through the television camera, and it is difficult to see through the turbid water and the damaged portion therein.

For this reason, it is conventionally practiced to drain water through a pipe or the like before inspecting with a television camera, but it is difficult to completely remove water even with a pig, and it is difficult to remove water from a damaged portion. Since the water continues to infiltrate, the same problem will remain after the pig passes and the water will stay in the low place again.

Even when water is accumulated in the pipeline, a large amount of water does not accumulate over the entire length of the pipeline, and in many cases, only a limited part of the long pipeline is retained. A small amount of water accumulates at the location, making inspection of that location difficult.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and after performing a general inspection through a television camera in a pipe line by a normal method, water is accumulated and the above-mentioned inspection is performed. It is an object of the present invention to provide a method and an apparatus for inspecting only a part that could not be confirmed.

[0007]

Means for Solving the Problems Thus, the method of the present invention comprises:
The TV camera is enclosed in a flexible tube having airtightness, and a pressure fluid is fed into the tube at a desired position in the tube to inflate the tube, and the tube is pressed against the inner surface of the tube to form a tube in the TV camera. It is characterized by observing the inner surface of the pipe from the inside.

The first aspect of the present invention, which is a concrete method of the present invention, is to fold back one end of a flexible tube having airtightness inward to form a double layer, close both ends of the tube, and A television camera is installed in the tube and attached to the inner end of the tube, and a pressure fluid is fed into the tube at a desired position in the tube to expand the outer portion of the tube and press-contact the inner surface of the tube. By inverting the inside of the tube at the folded portion so that the inside is outside, the television camera is moved backward in the tube, and the inside of the tube is observed from inside the tube with the television camera. is there.

In this method, it is preferable to cover the outer side of the outer portion of the tube in the initial state with a soft protective tube to protect the tube from friction during movement in the tube.

Further, in this case, the front end of the protective tube covered on the outer side of the tube is fixed to the outer end of the tube, and the protective tube is folded back to the outer side in the vicinity of the folded portion of the tube to form a double layer. However, it is preferable that all of the inner portion of the tube is inverted to the outside, and further that all of the inner portion of the protective tube is inverted to the outside, and the tube is pulled back and recovered from the inside of the tube.

As the protective tube, it is preferable to use a flexible thin tubular cloth, or a cloth having a flexible rubber or synthetic resin coating formed on one or both sides of the cloth.

A second aspect of the present invention, which is a specific method of the present invention, is to seal both ends of a flexible tube having airtightness, cover the outer side of the tube with a protective tube, and to attach one end of the protective tube to the tube. Fix it to the front end of the tube, fold the other end of the protective tube outwards to make a double, place the TV camera inside the tube, and put the tube with the TV camera inside at the desired position inside the tube By moving the outer end of the protective tube relatively forward, while turning the protective tube over so that the inner side is the outer side at the folded part, take out the tube with the built-in TV camera from the protective tube and apply pressure to the tube. It is characterized in that a fluid is fed and expanded to be brought into pressure contact with the inner surface of the tube, and the inner surface of the tube is observed from the inside of the tube by the television camera.

Next, the invention of the first device in the present invention is as follows.
One end of a flexible tube having airtightness is folded back inward to form a double tube, both ends of the tube are closed, a TV camera is placed inside the tube, and the tube is attached to the inner end of the tube. A pulling line for slidably penetrating the outer end of the tube and pulling forward is fixed to the tube, and a pressure fluid inlet port is formed at any one end of the tube.

In the present invention, it is preferable to cover the outer portion of the tube with a flexible protective tube. Further, in this case, the front end of the protective tube covered on the outer side of the outer portion of the tube is fixed to the outer end of the tube, and the protective tube is folded outward in the vicinity of the folded portion of the tube to form a double layer. It is preferable that the outer end of the protective tube is closed so that the tow line can slide, and a pull-back line extending rearward is fixed to the inner end of the tube.

In this case, the protective tube is
Suitably, it is made of a flexible thin tubular cloth or a cloth having a flexible rubber or synthetic resin coating formed on one or both surfaces thereof.

Further, in the invention of the second device in the present invention, both ends of a flexible tube having airtightness are closed, a protective tube is covered on the outside of the tube, and one end of the protective tube is attached to the front end of the tube. Fixed to
The other end of the protective tube is folded back outward to form a double line to close the outer end, a TV camera is placed inside the tube, and the outer end of the protective tube is slidably penetrated through the TV camera. It is characterized in that a pulling line is attached and a pressure fluid insertion port is formed at either end of the tube.

At least a part of the tube in the present invention is transparent, and it is preferable that the inside of the tube is observed through the transparent tube with the television camera.

Further, in the present invention, when at least a part of the tube is larger than the inner diameter of the tube and the tube has a large breakage portion, the tube is fitted into the breakage portion, and the inside of the breakage portion is broken by the television camera. It is desirable to be able to observe.

[0019]

1 shows an embodiment of the present invention, in which (a) shows an initial state in which a device 4 of the present invention is inserted into a pipeline 1, and (b) shows a pipeline. The execution state of the inspection which inspects the damaged part 3 of No. 1 is shown.

In FIG. 1, reference numeral 1 denotes a pipeline, and the pipeline 1
Water 2 stays inside, and there is damage 3 in the part hidden by the water 2. It should be noted that this pipe is passed through a television camera in advance by a usual method to inspect most of the inner surface, and only the portion where the water 2 has accumulated should be inspected.

Reference numeral 4 is the device of the present invention inserted in the conduit 1, 5 is a tube, and 6 is a television camera arranged in the tube 5. The tube 5 is folded back inward at the folded-back portion 5a in the central portion, and the ends of the outer portion 5b and the inner portion 5c thereof are respectively plugs 7 and 8.
Is closed.

The television camera 6 is arranged in the tube 5 between the stoppers 7 and 8 and its lens 6a faces downward. The tow cable 9 attached to the front end of the television camera 6 slidably penetrates the plug 7 at the outer end of the tube 5 to make the conduit 1
A cable 10 that extends inwardly and is attached to the rear end of the television camera 6 is fixed to the stopper 8 at the inner end of the tube 5, and further extends backward in the conduit 1.

The tube 5 is made of a flexible and airtight material and has at least an inner portion 5c in an initial state.
Is preferably transparent. For ease of inspection on the inner surface of the conduit 1, it is preferable that the tube 5 is entirely transparent, but the outer portion 5b is formed on the inner surface of the conduit 1 when the device 4 passes through the inner surface of the conduit 1. Since it may be scratched and scratched, it is preferable to reinforce it with a cloth or the like so as to have abrasion resistance even if the transparency is sacrificed.

Further, the tube 5 needs to be capable of adhering to the inner surface of the conduit 1 at least when an internal pressure is applied. The tube 5 itself has a diameter substantially equal to or larger than the inner diameter of the conduit 1 and may be used in a contracted state. Even if the tube 5 itself has a small diameter, the internal pressure May be expanded to an extent equal to the inner diameter of the conduit 1.

Further, the plug 8 of the tube 5 is provided with an inlet 11 for the pressure fluid such as compressed air so that the pressure fluid can be fed into the tube 5 from the rear of the conduit 1 by the hose 12. It is like this.

Thus, the device 4 is made to pass through the inside of the conduit 1 from the rear end of the conduit 1 by pulling the tow line 9. When the water 2 in the pipeline 1 reaches a location where the water 2 has accumulated, the device 4 is stopped from moving and the pressure fluid is fed into the tube 5 through the feed port 11, so that the fluid pressure causes the outer portion 5b of the tube 5 to flow. Expands, pushes the water 2 away and presses it against the inner surface of the conduit 1.

Further, due to the fluid pressure, a rearward force acts on the folded portion 5a, and the inner portion 5c of the tube 5 moves rearward in the outer portion 5b by the force, while the inside of the folded portion 5a becomes the outer side. So that the inner part 5c becomes the outer part 5b.
It is pressed against the inner surface.

As the tube 5 is inverted, the stopper 8
Moves rearward, and accordingly, the television camera 6 also moves rearward in the outer portion 5b. This state is shown in FIG. The position and moving speed of the TV camera 6 are
It can be controlled by the tow line 9.

Thus, in FIG. 1B, the tube 5
The outer part 5b (including the part which was the inner part 5c in the initial state) of the television 5 is pressed against the inner surface of the conduit 1 by pushing away the water 2, and the television camera 6 is connected via the outer part 5b of the tube 5. The inner surface of the conduit 1 can be observed.

When the tube 5 is transparent, the television camera 6 can take a picture of the inner surface of the conduit 1 through the tube 5. Even when only a part of the tube 5 is transparent, the inside of the conduit 1 can be photographed by adjusting the television camera 6 and positioning it on the transparent part.

Even when the tube 5 is not transparent, the outer portion 5b is pressed against the inner surface of the conduit 1 by the internal pressure. Therefore, if the conduit 1 is damaged 3, the inner surface of the tube 5 is damaged 3. Appear as unevenness, and the presence of the damage 3 can be visually recognized by observing the unevenness with the television camera 6.

When the inspection of the inner surface of the pipe 1 by the TV camera 6 is completed, the tow line 9 is pulled while the pressure fluid in the tube 5 is being drained from the inlet 11 via the hose 12 and the outer portion of the tube 5. The television camera 6 is moved forward in 5b, and the portion which has been the outer portion 5b is turned inward by the folded portion 5a to become the inner portion 5c. Further, the fluid in the tube 5 is drained to remove the outer portion 5b. By reducing the size, the state is returned to the initial state of FIG. 1A again, and the tow line 9 is further pulled to move the device 4 to the next inspection location to continue the inspection.

Next, FIG. 2 shows another embodiment of the present invention, in which (a) shows the initial state and (b) shows the inspected working state.

In this embodiment, the outer side 5b of the tube 5 in the device shown in FIG. 1 is covered with the protective tube 13, and the front end of the protective tube 13 together with the outer end of the tube 5 is covered. It is fixed to the stopper 7.

The protective tube 13 does not need to be airtight. Since the protective tube 13 prevents the tube 5 from being damaged by friction with the inner surface of the pipe 1 when the device 4 passes through the pipe 1, the flexible thin tubular cloth or the cloth. It is suitable to form a flexible rubber or synthetic resin coating on one side or both sides. Further, this protective tube 13 also needs to be capable of being brought into pressure contact with the inner surface of the conduit 1 when the inner pressure acts.

When the device 4 is stopped at a desired position in the conduit 1 and the pressure fluid is fed into the tube 5 there, the outer portion 5b expands, as shown in FIG. 2 (b). Then, the water 2 is pushed away and pressed against the inner surface of the conduit 1 through the protective tube 13, and the inner portion 5c is folded back.
At a, the inside is turned outside so that the television camera 6 is moved backward while being pressed against the inside surface of the conduit 1 by the internal pressure, and the inside portion 5c is inverted and the outside portion 5b is turned on.
The inside of the conduit 1 is observed by the television camera 6 through the portion marked with.

Next, FIG. 3 shows still another embodiment of the present invention, in which (a) shows an initial state, (b) shows a working state, and (c) and (d) show the device 4 as a pipe. It shows a state of pulling back to the rear of the road 1.

In this embodiment, the tip portion of the protective tube 13 in the device shown in FIG. 2 is folded back outward at the folded portion 13a and extends forward, and the tip thereof is located in front of the stopper 7. It is blocked by 14. The tow line 9 is slidably passed through the plug 14.

The tow line 9 has two stoppers 15,
The stopper 16 is fixed, the stopper 15 at the rear side can pass through the stopper 14 and is locked to the stopper 7, and the stopper 16 at the front is locked to the stopper 14. Reference numeral 17 is a pull-back rope fixed to the plug 8 and extending rearward.

Then, the tube 5 is placed at a desired position in the conduit 1.
When the pressure fluid is fed into the inside, the outer portion 5b of the tube 5 is expanded and doubled through the outer portion 13b and the inner portion 13c of the protective tube 13 as described in the embodiment of FIG. It is pressed against the inner surface of the road 1.

Further, the inner portion 5c of the tube 5 is reversed so that the inner portion is the outer side at the folded portion 5a, the water 2 is pushed away by the inner pressure and the television camera 6 is moved backward while being pressed against the inner surface of the conduit 1. Then, the inside of the conduit 1 is observed and inspected by the television camera 6 through the part where the inner part 5c is inverted to become the outer part 5b. This state is shown in FIG.

By the way, in the present invention, when the device 4 is passed through the pipe line 1, due to unevenness or steps in the pipe line 1,
It may be difficult to pass the device 4 in front of the conduit 1.

At this time, the device 4 is pulled back to the rear of the conduit 1 by the cable 10 to recover the device. In the embodiment of FIG. 2, the protective tube 13 is fixed only at its front end and the rear end is free. Since it is in the state, when the device 4 is pulled back, the protective tube 13 is rolled back due to the friction with the pipe line 1, and the device 4 and the inner surface of the pipe line 1 are clogged, making it difficult to pull back. May not be able to retrieve the device 4 either in front of or behind the conduit 1.

In such a case, in the embodiment shown in FIG. 3, by pulling the pullback rope 17 backward, first, as shown in FIG.
As shown in FIG. 3, the inner part 5c of the tube 5 is all turned over to the outside, the stopper 15 is locked to the stopper 7, and then further pulled, so that the inner part 13c of the protective tube 13 is shown as shown in FIG. 3 (d). Are all reversed to the outside, and the stopper 16 is locked to the stopper 14.

When the pull-back cord 17 is pulled in this state, the protective tube 13 extends almost straight between the stoppers 7 and 14, so that there is no part to be turned over, and the device 4 can be smoothly moved backward and collected. You can

In this embodiment, the pullback cord 17 does not necessarily have to be provided as a separate member, and the cable 10 or the hose 12 can also function as it. If the tube 5 and the protective tube 13 have sufficient strength, the stoppers 15 and 16 are not always necessary.

Next, FIG. 4 shows still another embodiment of the present invention. (A) shows an initial state, (b) shows a process of shifting from an initial state to a working state, and (c) shows a working state. It shows the state.

In FIG. 4, both ends of the tube 5 are stoppers 7 and 8.
It is closed with a TV camera 6 inside the tube 5.
Is housed. The tow cable 9 attached to the front end of the television camera 6 slidably penetrates the plug 7 and extends forward, and the cable 10 extending rearward from the rear end slidably penetrates the plug 8.

The protective tube 1 is provided outside the tube 5.
3 is covered, the front end of the protection tube 13 is fixed to the stopper 7, the rear end is folded back to the outside at the folded portion 13a, and is fixed to the stopper 14 in front of the stopper 7. The tow line 9 is slidably passed through the plug 14.

The tow lines 1 are also attached to the stoppers 7 and 14, respectively.
8 and 19 are fastened, and the tow line 1 fastened to the plug 7
Reference numeral 8 slidably penetrates the plug 14, and both tow lines 18 and 19 extend forward in the duct 1. The pull-back cord 1 is attached to the stopper 8.
7 is fixed and extends backward in the pipe line 1.

Thus, in this embodiment, the tow lines 9 and 1 are
After pulling 8 and 19 to advance the device 4 in the conduit 1 and stopping the device 4 at a desired position, when only the tow line 19 is towed while supporting the pullback line 17, the inside of the protection tube 13 By moving the outer portion 13b forward while the portion 13c is turned outward at the folded-back portion 13a,
As shown in FIG. 4B, the protective tube 13 is the tube 5
Is removed from the outside of the tube, and the tube 5 is exposed in the conduit 1. In this case, the tube 5 is pulled back by pulling back the pulling back rope 17 while supporting the pulling rope 19 contrary to the above procedure.
Can also be exposed.

In this state, when the pressure fluid is fed from the hose 12 into the tube 5, the tube 5 expands as shown in FIG. 4 (c) to push the water 2 away and press it against the inner surface of the pipe 1.
The television camera 6 observes the inner surface of the conduit 1 through the tube 5. At this time, the tow cable 9 and the cable 10 can be operated to move the television camera 6 in the tube 5,
The inner surface of the conduit 1 can be observed over a wide range.

After the inspection of the inner surface of the conduit 1 is completed, the fluid in the tube 5 is drained, the tow cable 18 is pulled, and the tube 5 and the television camera 6 are drawn into the protective tube 13 again. After returning to the state of a), the device 4 can be further moved to inspect the next position.

In the present invention, the tube 5 may be expanded to a diameter substantially equal to or slightly larger than the inner diameter of the conduit 1 as described above, but the number of the tube 5 is small. In addition, if a part of the pipe 1 is sufficiently larger than the inner diameter of the pipe 1,
When the tube 5 is inflated by the internal pressure, the tube 5 is fitted into the damaged portion, so that water inside the damaged portion can be removed by the tube 5 and the inside of the damaged portion can be observed by the TV camera 6, and the damage can be observed. It is possible to inspect even the depth of the place and the structure of damage.

[0055]

According to the present invention, the television camera 6 is enclosed in the flexible tube 5 having airtightness, and the pressurized fluid is fed into the tube 5 at a desired position in the conduit 1 to expand the tube. No, since the inner surface of the pipe 1 is observed from the inside of the tube 5 with the TV camera 6 in a state where the water 5 accumulated in the pipe 1 is pushed away and the tube 5 is pressed against the inner surface of the pipe 1, Therefore, it is possible to reliably observe and detect the damaged portion of the conduit 1 without any obstacle.

Further, according to the inventions of claims 2 and 8, in the state where the outer portion 5b of the tube 5 is expanded by the internal pressure, the outer portion 5b and the inner portion 5c are reversed to each other, so that The television camera 6 can be moved, and a wide range of inspections can be performed. Further, according to the apparatus of claim 8, the position and movement speed of the television camera 6 can be controlled by the tow line 9.

In the inventions of claims 3 and 9, the outer side of the tube 5 is protected by the protective tube 13, and the device 4
It is possible to prevent the tube 5 from being damaged due to friction when the tube 5 moves in the conduit 1.

Further, according to the inventions of claims 4 and 10, when the device 4 cannot move in the conduit 1 due to the circumstances in the device 4, the protective tube 13 causes the conduit 1 and the device 4 to move. It is possible to easily pull back the device 4 to the rear of the conduit 1 without being turned over or caught between and.

Further, according to the inventions of claims 6 and 12,
The tube 5 enclosing the TV camera 6 is protected by the protective tube 13 as it is, and the tube 5 is used for the inspection.
Since there is no inversion, there is no problem in inversion of the tube 5, and it is possible to always operate smoothly. In addition, as shown in FIG. 4, the tow cable 9 and the cable 1
By inserting 0 into the stoppers 7, 8 and 14 slidably, the television camera 6 can be moved inside the tube 5, and the inner surface of the wide range of the conduit 1 can be inspected.

Further, according to claims 7 and 13, since the tube 5 is transparent, the inner surface of the conduit 1 can be observed in more detail through the tube 5.

Further, according to claim 14, when there is a large damaged portion in the pipeline 1, the inside of the damaged portion can be inspected, and the repair method can be easily selected depending on the damaged state. Become.

The present invention is not limited to the case of inspecting the inner surface of the conduit 1 for damage, but can be used for observing and inspecting the condition of the inner surface of the conduit 1 for various purposes. . Further, the object of inspection is not limited to the underground buried pipeline as described above, but can be widely applied to various types of pipelines.

[Brief description of drawings]

FIG. 1 is a central vertical cross-sectional view showing one embodiment of the present invention, in which (a) shows an initial state and (b) shows a state where an inspection is performed.

2A and 2B are central longitudinal sectional views showing another embodiment of the present invention, in which FIG. 2A shows an initial state and FIG.

FIG. 3 is a central longitudinal cross-sectional view showing still another embodiment of the present invention, (a) showing an initial state, (b) showing an inspection execution state, and (c) and (d) pulling back the apparatus. Shows the state of recovery.

FIG. 4 is a central longitudinal cross-sectional view showing still another embodiment of the present invention, in which (a) shows an initial state, (b) shows a process of shifting from an initial state to a working state, and (c) shows The implementation state is shown.

[Explanation of symbols]

 4 device 5 tube 6 TV camera 9 tow line 11 inlet 13 protection tube 17 pull back line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tamotsu Uno 3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture 3-22 Kansai Electric Power Co., Inc. (72) Hiroyuki Nakazono 3-chome Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture No. 22 Kansai Electric Power Co., Inc. (72) Inventor Masao Matsumura 3-3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture 22-3 Kansai Electric Power Co., Inc. (72) Inventor Katsuhiko Higashi 2-3-3 Mizuo, Ibaraki City, Osaka Prefecture (72) Inventor Eiji Kitagawa 3-183, Kyomachi, Fushimi-ku, Kyoto City, Kyoto Prefecture Riviere Momoyama No. 507

Claims (14)

[Claims] 1. A television camera (6) is enclosed in a flexible tube (5) having airtightness, and a pressurized fluid is introduced into the tube (5) at a desired position in the tube (1). Inflate and press the tube (5) against the inner surface of the tube (1),
A method of inspecting an inner surface of a tube (1), wherein the inside of the tube (1) is observed from the inside of the tube (5) with the television camera (6). 2. A flexible tube (5) having airtightness is folded inward to form a double tube, both ends of the tube (5) are closed, and a television camera () is provided inside the tube (5). 6) is placed and attached to the inner end of the tube (5), and the pressurized fluid is pumped into the tube (5) at a desired position in the tube (1) to bring the outer portion (5) of the tube (5) into place.
b) is expanded and pressed against the inner surface of the tube (1), and the inside of the tube (5) is turned upside down at the folded portion (5a) of the tube (5) by the fluid pressure, so that the television camera (6) is A method for inspecting the inside of the tube (5), which comprises moving the tube (5) backward and observing the inside of the tube (1) from the inside of the tube (5) with the television camera (6). 3. A flexible protective tube (13) outside the outer part (5b) of the tube (5) in its initial state.
Pipe inner surface inspection method according to claim 2, characterized in that the tube (5) is covered with a pipe to protect the tube (5) from friction during movement in the pipe (1). 4. The outer portion (5b) of the tube (5)
The front end of the protective tube (13) covered on the outer side of the tube (5) is fixed to the outer end of the tube (5), and the protective tube (13) is folded back to the outside in the vicinity of the folded portion (5a) of the tube (5). The inner part (5c) of the tube (5) is inverted to the outside, and the inner part (13c) of the protection tube (13) is inverted to the outside while pulling back the tube (1). ) Inside, the pipe inner surface inspection method according to claim 3, characterized in that 5. The protective tube (13) is characterized in that it is made of a flexible thin tubular cloth or a cloth having a flexible rubber or synthetic resin coating formed on one or both sides of the cloth. Item 3 or 4 pipe inner surface inspection method 6. A flexible tube (5) having airtightness is closed at both ends, a protective tube (13) is covered on the outer side of the tube (5), and the protective tube (13) is provided.
One end of the protective tube (5) is fixed to the front end of the tube (5), and the other end of the protective tube (13) is folded outward to form a double layer.
The TV camera (6) is arranged in the tube (5), and the tube (5) containing the TV camera (6) at a desired position in the tube (1) is rearwardly moved to the outer end of the protection tube (13). Of the tube (5) containing the television camera (6) while turning the protection tube (13) inside out at the folded-back portion (13a) by moving the protection tube (13) forward. ), Pressure fluid is fed into the tube (5) to expand the tube (1) and press-contact with the inner surface of the tube (1), and the inner surface of the tube (1) is observed from the inside of the tube (5) with the TV camera (6). Pipe inner surface inspection method characterized by 7. The tube (5) is transparent, and the inside of the tube (1) is observed through the transparent tube (5) with the television camera (6).
2, 3, 4, 5 or 6 pipe inner surface inspection method 8. An airtight flexible tube (5) is folded inward at one end to form a double layer, both ends of the tube (5) are closed, and a television camera () is provided inside the tube (5). 6) is arranged and attached to the inner end of the tube (5), and the tube (5) is attached to the TV camera (6).
A pulling line (9) for slidably penetrating the outer end of the tube and pulling forward is fixed, and a pressure fluid inlet (11) is formed at either end of the tube (5). , Pipe inner surface inspection device 9. Outer part (5b) of said tube (5)
9. A pipe inner surface inspection apparatus according to claim 8, wherein a flexible protective tube is covered on the outside of the pipe. 10. An outer portion (5) of the tube (5).
The front end of the protective tube (13) covered on the outer side of (b) is fixed to the outer end of the tube (5), and the protective tube (1) is provided near the folded portion (5a) of the tube (5).
3) is folded back outward to form a double layer, the outer end of the protection tube (13) is closed so that the tow line (9) can slide, and the inner end of the tube (5) is moved backward. The pipe inner surface inspection device according to claim 9, characterized in that an extended pullback cord (17) is fixed. 11. The protective tube (13) is made of a flexible thin tubular fabric, or a fabric in which a flexible rubber or synthetic resin coating is formed on one or both sides of the fabric. Item 9. The pipe inner surface inspection device according to item 9 or 10. 12. An airtight flexible tube (5)
Both ends of the tube are closed, a protective tube (13) is covered on the outside of the tube (5), and the protective tube (1
One end of 3) is fixed to the front end of the tube (5), and the other end of the protective tube (13) is folded back outward to form a double line to close the outer end of the tube (5). The television camera (6) is arranged on the television camera (6), and a tow line (9) slidably passing through the outer end of the protection tube (13) is fixed to the television camera (6), and one of the tubes (5) is attached. A pipe inner surface inspection device, characterized in that a pressure fluid insertion port (11) is formed at the end of the pipe. 13. Pipe inner surface inspection device according to claim 8, 9, 10, 11 or 12, characterized in that the tube (5) is transparent. 14. If at least a part of the tube (5) is larger than the inner diameter of the tube (1) and the tube (1) has a large breakage point, the tube (5) fits into the breakage point, The television camera (6) allows observation to the inside of the damaged portion, wherein the television camera (6) is observable.
Pipe inner surface inspection device according to 0, 11, 12 or 13