JPH10239292A - Device and method for inspecting inside of tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inspect the inside of an objective tube with only one part of the tube being opened and to move an inspection sensor easily and freely by moving an inspection pig part in the axis direction of the tube via a liquid being fed into the tube. SOLUTION: A interlocking tube 50 is connected to the opening edge of a tube 44 inside and outside a lamp of a tube to-be-inspected 40, a signal line 30 from an inspection pig part 1 is pulled from a branch tube 52, and the opening of the branch tube 52 is sealed by a rubber plug 54. Then, the inside of the interlocking tube 50 is filled with water and a pressure-resistant container being filled with water 60 is interlocked. A capacitor 70 is driven to increase an atmospheric pressure in the container 60, and a valve 56 is opened slightly, and water is pushed into the target tube 40 by the inflating force of a high pressure air in the container 60, thus carrying the inspection pig part 1 to a position for inspection. Then, while the inspection pig part 1 is traveled with a constant speed by the inflating force of the high pressure air in the container 60, the thickness of a tube wall is inspected from the inside of the tube and the inspection result is output by an display/storage means 80. Water also plays a role of a propagation medium of an ultrasonic wave from a sensor 10 for inspection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an in-pipe inspection apparatus and an in-pipe inspection method for inspecting an inner surface of a pipe such as a conduit.

[0002]

2. Description of the Related Art Conventionally, this kind of in-pipe inspection technology includes:
As illustrated in FIG. 7, a pair of water sealing jigs 90, 90 are inserted into the inner surface of the target pipe 40 at two locations sandwiching the inspection target location, and the inner space of the pipe sandwiched between the two water sealing jigs is inserted. Using an ultrasonic probe 10 as an inspection sensor and operating means capable of moving the ultrasonic probe in the pipe axis direction while supporting the ultrasonic probe at the center in the pipe diameter direction of the target pipe, ultrasonic waves in the pipe space are used. There is a technique for performing inspection by filling with water as a medium through which ultrasonic waves emitted from a probe propagate. In this case, the operating means includes a pair of fixing airbags 91, 91, and an operating tube 92 communicating with the inside of the fixing airbags, and is sandwiched between the pair of fixing airbags of the operating tube 92. Since the ultrasonic probe 10 is externally fitted to the cut portion, air is sent from the other end of the operation tube that penetrates one of the water sealing jigs and extends to the outside of the target tube, thereby fixing the pair of fixed members. When the airbag 91 is inflated, the fixing airbag is tightly fixed to the inner surface of the target tube, and at the same time, the ultrasonic probe is positioned at the center of the target tube in the tube radial direction. Then, if air is evacuated from the other end of the operation tube to reduce the diameter of the fixing airbag, the operation tube 92 can be pushed and pulled from outside the target tube. The position of the touch element 10 can be moved.

[0003]

In the above-mentioned conventional in-pipe inspection technique, the target pipe is opened at two places in order to insert a liquid (water) sealing jig into two places sandwiching the inspection target place of the target pipe. The ultrasonic probe needs to be moved only in the space between the pair of liquid sealing jigs. The difficult task of moving the liquid sealing jig on the inner surface of the (particularly the inner surface is not smooth especially in the case of a gas conduit) is forced. At least when the target pipe is a gas conduit, the liquid sealing jig, It is necessary to collect the ultrasonic probe and the operating means together with the predetermined liquid filled between the pair of liquid sealing jigs outside the target tube, but it is difficult to reliably collect the entire amount of the predetermined liquid. There were some problems.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks in the conventional in-tube inspection technique exemplified above, the object of the present invention is that inspection can be performed by opening the target pipe at one location, and a pair of temporary pipes temporarily fixed to the target pipe is provided. The inspection sensor can be relatively easily and freely moved without being restricted by the liquid sealing jig,
In the case where the target pipe is a gas conduit, after the inspection is completed, even if it is necessary to collect the entire amount of the predetermined liquid held in the pipe as a medium for the ultrasonic probe outside the target pipe, the above-described collection is performed. An object of the present invention is to provide an in-pipe inspection apparatus and an in-pipe inspection method that can be executed relatively easily and almost certainly.

[0005]

[Means for Solving the Problems]

[1] In order to achieve the above object, the characteristic configuration of the in-pipe inspection apparatus according to claim 1 of the present invention includes an inspection pig section 1, 2, 3
And operating means 100 for moving the inspection pig portion in the axial direction of the inspection target tube via a predetermined liquid supplied into the inspection target tube, and the inspection target tube is configured by the inspection pig portion. A liquid-sealing pig that can move in the axial direction of the pipe to be inspected while being fitted all around the inner circumference of the pipe, and an inspection sensor 1 for inspecting the inner surface of the pipe to be inspected
0 and positioning means for maintaining the relative positions of both members constant.

[Effects of the Invention] Due to the above-mentioned features,
In the in-pipe inspection apparatus according to claim 1 of the present invention, after inserting the apparatus from one end of the target pipe, a predetermined liquid is injected from one end of the target pipe, and the predetermined liquid is pushed and pulled from the same end, the inspection is performed. Since the position of the sensor can be controlled, inspection can be performed by opening the target tube at one place, and the liquid sealing pig that moves with the inspection sensor serves as a liquid sealing jig. When the inspection sensor can be moved relatively easily and freely without being restricted by a fixed water sealing jig, etc., and a predetermined liquid is required as a medium for the ultrasonic probe. Also, the predetermined liquid pushed and pulled to move the inspection sensor can also serve as the medium, and all of the predetermined liquid is in principle present on the one end side of the target pipe opened rather than the liquid sealing pig. Specified liquid The specific effect that substantially all is automatically collected reliably in a predetermined liquid operation of recovering the inspection sensor by pulling operation occurs.

[0007] In addition to the features of the first aspect, as in the second aspect of the invention, the second pig 24 provided with a close contact portion with the inner wall of the pipe to be inspected as the positioning means, and A connecting means 11 for connecting the second pig to the liquid sealing pig is provided, and further, the liquid insertion portions 28,... Which allow the predetermined liquid to pass through the pipe to be inspected in the axial direction thereof. . May be provided on the second pig, and the inspection sensor 10 may be fixed to the connecting means. In the case of implementing in such a form, first, the liquid sealing pig, the connecting means, and the second pig are inserted from the open end of the target pipe in the order, and the predetermined liquid is continuously injected into the target pipe, so that the close contact is achieved. Since the center of the second pig in the radial direction automatically matches the axis of the target pipe, and the center of the liquid sealing pig in the radial direction also automatically matches the axis of the target pipe, The position of the test sensor fixed to the connecting means connecting the two pigs with respect to the inner surface of the target pipe is also kept constant, enabling accurate pipe inspection, and the predetermined liquid is passed through the liquid insertion portion to the first pipe. When the inspection sensor is an ultrasonic probe, the space between the two pigs and the liquid-sealing pig is filled, so that a unique effect of functioning as a medium for transmitting ultrasonic waves is produced. Further, in this embodiment, since the connecting means is easily formed by a member having a small diameter, there is an advantage that the annular inspection sensor is conveniently used as an object to be externally fixed.

Alternatively, in addition to the characteristic structure of the first aspect, as in the third aspect of the present invention, the positioning means can be moved integrally with the liquid sealing pig in the inspection object pipe, and A second pig 25 provided with a close contact with the inner wall of the pipe, and a liquid insertion part 2 for allowing the predetermined liquid to pass through the pipe to be inspected in the axial direction thereof;
8 ',. . May be provided on the second pig, and the inspection sensor 10 may be fixed to the second pig 25. In the case of implementing in such a form, first, the liquid sealing pig and then the second pig are inserted from the open end of the target pipe, and then the predetermined liquid is injected into the target pipe. The center of the second pig in the radial direction automatically coincides with the axis of the target pipe, and the two pigs provided integrally with each other so as to be able to move within the target pipe cooperate with each other to position the second pig with respect to the target pipe. Is also kept constant, so that the position of the second fixed inspection sensor with respect to the inner surface of the target pipe is also kept constant, enabling accurate pipe inspection, and the predetermined liquid passes through the liquid insertion portion. The space between the sensor for inspection on the second pig and the inner surface of the pipe to be inspected is filled, and when the sensor for inspection is an ultrasonic probe, it functions as a medium for transmitting ultrasonic waves. The effect occurs. Further, in this embodiment, since the inspection sensor is directly fixed on the second pig having the close contact portion, there is also an advantage that the position and posture of the inspection sensor with respect to the inner surface of the inspection target tube are more stably held. Occurs.

Alternatively, in addition to the features of the first aspect, the liquid sealing pig 2 according to the fourth aspect of the present invention is provided.
3 is provided with a posture holding means for keeping the posture of the pipe to be inspected constant with respect to the axis, and as the positioning means, the inspection sensor 1 is used.
The present invention may be implemented in a mode in which fixing means 12 for fixing 0 to the liquid-sealing pig is provided. When implemented in such a form,
The inspection pig portion is formed in a compact configuration with only one pig, so that the operation of the inspection inside the tube is easier, and the posture of the inspection sensor with respect to the axis of the inspection target tube by the operation of the posture holding means. Has a unique effect that it is kept constant with the posture of the liquid sealing pig itself and enables accurate in-pipe inspection. In addition, if the fixing point of the inspection sensor is set at one end of the liquid pipe that is open from the seal part of the liquid-pig pig to the inspection pipe, the predetermined liquid can be inspected by the inspection sensor on the liquid-pig pig. When the inspection sensor is an ultrasonic probe, the space between the inner surfaces of the target pipes is filled, and there is a special effect that the ultrasonic sensor functions as a medium for transmitting ultrasonic waves. Also in this embodiment, since the inspection sensor is directly fixed on the liquid-sealing pig that is in close contact with the inner surface of the inspection target tube, the position and posture of the inspection sensor with respect to the inner surface of the inspection target tube are more stably held. The advantage also arises.

[2] In order to achieve the above object, a characteristic configuration of the in-pipe inspection method according to claim 6 of the present invention includes the following steps. Seal part 21 that fits over the entire circumference of the pipe to be inspected in the radial direction
, A test sensor 10 for testing the inner surface of the pipe to be tested, and a positioning means for holding the test sensor at a predetermined position with respect to the liquid pig. A first step of inserting the in-pipe inspection device provided with the inspection pipe into the inspection pipe so that the inspection sensor is located closer to the pipe end than the seal portion 21 from the open pipe end of the inspection pipe. <2> A space between the seal portion and the pipe end in the pipe to be tested is filled with a predetermined liquid, and the filled predetermined liquid is pushed and pulled from the pipe end side to inspect the in-pipe inspection apparatus. The second step of moving to a desired position and inspecting.

[Effects of the Invention] Due to the above-mentioned features,
In the in-pipe inspection method according to claim 5 of the present invention, after inserting the device from one end of the target pipe, a predetermined liquid is injected from one end of the target pipe, and the predetermined liquid is pushed and pulled from the same end. Since the position of the sensor can be controlled, inspection can be performed by opening the target tube at one place, and the liquid sealing pig that moves with the inspection sensor serves as a liquid sealing jig. When the inspection sensor can be moved relatively easily and freely without being restricted by a fixed water sealing jig, etc., and a predetermined liquid is required as a medium for the ultrasonic probe. Also, the predetermined liquid pushed and pulled to move the inspection sensor can also serve as the medium, and all of the predetermined liquid is in principle present on the one end side of the target pipe opened rather than the liquid sealing pig. Specified liquid The specific effect that almost entirely automatically collected reliably in a predetermined liquid operation of recovering the inspection pig unit including a test sensor by pulling operation occurs. That is, at the time of the above-mentioned collection, the liquid-pig of the inspection pig section returns on the inner surface of the target pipe while maintaining the liquid-sealed state, so that the recovery rate of the predetermined liquid is high.

[0012] In addition to the features of the fifth aspect of the invention,
As in the invention described in claim 6, the second step may be an in-pipe inspection method having the following small steps. <2-1>
A first small step of filling a predetermined liquid in a space from a seal portion to a pipe end in a pipe to be inspected, <2-2> connecting a pressure control means to the pipe end, and supplying a liquid of the predetermined liquid with a gas in a pressurized state. A second small step of pushing down the surface and raising the level of the predetermined liquid with the gas under the negative pressure. By implementing in such a form, the object to be pushed and pulled after the pressure from a mechanical pneumatic operation means such as a pump or a compressor, or a vacuum pump is buffered by a gas, that is, a compressible substance. Since it is transmitted to the liquid level, there is a specific effect that the liquid level can be adjusted separately from the movement of the mechanical air pressure operation means itself. That is, even if the pressure generated by the mechanical air pressure operation means includes fluctuations and pulsations, these do not adversely affect the adjustment of the liquid level, and the adjustment of the liquid level can be accurately performed.

Further, in addition to the characteristic configuration of the above-described sixth aspect of the present invention, as in the seventh aspect of the present invention, a valve means 56 capable of stopping the movement of the filled predetermined liquid in the inspection object pipe is provided. The 2-2nd small step may be an in-pipe inspection method including the step of adjusting the position of the in-pipe inspection apparatus by operating the valve means. By implementing in such a form, the liquid level is adjusted by opening and closing or adjusting the cross-sectional area of the passage portion of the incompressible liquid.
The unique effect that the liquid level can be accurately adjusted without being affected by the buffer action of the compressible gas is obtained.

In the description of the above-mentioned features, the reference numerals are used for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an in-pipe inspection apparatus and an in-pipe inspection method according to the present invention will be described. The thickness of the pipe at the part before the part is inspected from the meter cock provided at the pipe part raised on the ground, while keeping the pipe in an active pipe state, as an example, based on the drawings. To explain.

(Structure of Inspection Pig Portion) The inspection pig portion 1 shown in FIG. 1 comprises a liquid sealing pig 20, a second pig 24, and a connecting rod 11 for connecting the two pigs in the axial direction of the pipe to be inspected.
(Example of positioning means), has an inspection sensor 10 externally fitted and fixed near the middle of the connecting rod 11, and a signal line 30 extended from the inspection sensor 10 long. When the inspection pig part 1 is inserted into the tube to be inspected such that the liquid-ring pig 20 comes first and the second pig 24 comes later (see FIG. 2),
The liquid sealing pig 20 is movable in the axial direction of the pipe to be inspected while being fitted to the inner surface of the pipe to be inspected by a seal portion 21 provided on the entire circumference in the radial direction. 2nd pig 2
4 are in close contact with the inner wall of the tube to be inspected at four locations in the radial direction. . When the test pig portion 1 is inserted into the test pipe, the position of the axis of the second pig 24 coincides with the axis of the test pipe similarly to that of the liquid sealing pig 20. . The connecting rod 11 has flexibility enough to allow the inspection pig portion 1 to pass through the bend portion of the inspection target tube, but at the same time, at least the inspection pig portion 1 inspects the linear portion in the inspection target tube. In the process of proceeding, the center of the inspection sensor 10 fitted to the outside has a rigidity such that the center of the inspection target tube is positioned substantially at the axis of the tube to be inspected. Also, the 4 provided on the side surface of the second pig 24
The liquid insertion portion 28 at the location serves to maintain the two spaces in the pipe to be inspected distributed around the second pig 24 in a communicating state. The inspection sensor 10 includes:
A high-frequency array that receives the reflected waves of the ultrasonic waves emitted by the inner surface of the tube wall and the reflected waves from the outer surface of the tube wall, and inspects the wall thickness of the tube wall using the difference in stroke between these reflected waves. Since it is a probe of the type, and 12 channels are arranged in a ring shape in parallel with the peripheral surface of the tube wall, it has a resolution not only in the axial direction of the tube to be inspected but also in the circumferential direction. Water may be used as a medium through which the ultrasonic wave propagates. Inspection pig part 1
Can be moved in the axial direction of the tube to be inspected by operating means described below.

(Structure of Operating Means) The operating means 100 shown in FIG. 3 withstands an internal pressure of at least about 10 kg / cm ^{2, and} has a scale 62 with a scale 62 capable of indicating a change in volume of the liquid stored therein. A connection pipe 50 capable of connecting the container 60 and the pressure-resistant container 60 to the meter cock 46 in an airtight state;
A compressor 70 (an example of an air pressure operation means) for sending compressed air to increase the air pressure in the pressure vessel 60 above the atmospheric pressure, or a vacuum pump 75 (pressure operation) for lowering the air pressure in the pressure vessel 60 to the atmospheric pressure or less. Example of means), compressor 70 or vacuum pump 75 and pressure vessel 60
Has a pressure-resistant hose 72 for connecting the same. Pressure vessel 6
A manual valve 56 is interposed between the connection pipe 50 and the connection pipe 50. The connection pipe 50 is connected to the signal line 30 extending from the inspection sensor 10 of the inspection pig unit 1 in the inspection pipe 40. A branch pipe 52 for guiding the outside of the pipe 40 is formed,
The gap between the branch pipe 52 and the signal line 30 is sealed by a rubber stopper 54. The end of the signal line 30 led to the outside is connected to a display / recording means 80 for displaying and recording a wall thickness measurement result of a pipe wall installed on the ground.

(In-Pipe Inspection Step) The in-pipe inspection (here, measurement of the wall thickness of the pipe wall) is generally performed according to the following steps. (1) The meter cock 46 of the inner tube 44 outside the lamp (tube portion raised above the ground) of the inspection target tube 40 is closed, the gas meter 200 is once removed, and the inspection pig portion 1 is inserted into the tube portion 44 therefrom. After that, the space from the liquid sealing pig 20 of the inspection pig unit 1 to the open end of the lamp outer tube 44 is filled with water (see FIG. 2). The liquid insertion portion 2 is provided on the side surface of the second pig 24.
8 is provided, if water is poured from the upper end opening of the lamp outer tube 44, the sealing portion 21 of the liquid sealing pig 20 and the second
The space between the pigs 24 is also filled with water. (2) After connecting the meter cock 46 with the bulb closed to the open end of the lamp inner tube 44, the connecting tube 50 is connected. At this time, the signal line 30 extending from the inspection pig unit 1 is drawn out from the branch pipe 52 and the mouth of the branch pipe 52 is sealed with a rubber stopper 54. Next, after filling the inside of the connecting pipe 50 with water,
The pressure vessel 60 filled with water is connected to the connection pipe 50 (see FIG. 3). Subsequently, a compressor 70 is connected to the pressure-resistant container 60 by a pressure-resistant hose 72. (3) The compressor 70 is driven to increase the air pressure in the upper end space in the pressure vessel 60 to about 0.1 to 1 kg / cm ² ,
The manual valve 74 provided in the middle of the pressure-resistant hose 72 is closed, and then the manual valve 56 is opened little by little while monitoring the liquid level in the pressure-resistant container 60. The test pig portion 1 is conveyed to the inspection target position (the position is determined by associating the liquid level change in the pressure-resistant container 60 with the internal volume of the tube) by pushing the water inside into the inspection target tube 40 (FIG. 4). See). Subsequently, the thickness of the pipe wall is inspected from the inside of the pipe while the inspection pig part 1 is operated at a constant speed using the inflation force of the high-pressure air in the pressure-resistant container 60, and the inspection result is displayed on the display / recording means 80. Output. At this time, water for running the inspection pig unit 1 also serves as a medium for transmitting ultrasonic waves emitted from the inspection sensor 10. (4) When the inspection is completed, a vacuum pump 75 is connected to the pressure-resistant hose 72 instead of the compressor 70, and the inside of the pressure-resistant container 60 is set to a negative pressure, so that most of the water in the inspection target pipe 40 is stored in the pressure-resistant container 60. To be collected. When this water collecting operation is performed, the inspection pig unit 1 is automatically turned on because of the water sealing action that the liquid sealing pig 20 of the inspection pig unit 1 maintains in cooperation with the inner surface of the inspection target pipe. It can be collected up to the vicinity of the open end of the outer and inner tubes 44. (5) When the water remaining in the lamp outer tube 44 and the inspection pig portion 1 are collected outside the tube, the connecting tube 50 and the pressure-resistant container 60 are removed, and the meter cock 46 is attached to the lamp inner tube 44 instead. .

[Another Embodiment] <1> The inspection pig section 2 shown in FIG. 5 is a modified example of the inspection pig section 1 of FIG. The inspection pig part 2 is also provided with the liquid sealing pig 20 including the seal part 21 and the contact parts 26 ′, 26 ′,. . And the liquid insertion portions 28 ', 28',. . The second pig 25 containing
And the two pigs are connected by the cord-like body 14 capable of holding the distance between the two pigs at a certain value or less, so that the liquid-sealing pig 20 and the second pig 25 are substantially integrated with each other in the pipe to be inspected. Can be moved to However, the inspection sensor 10 is fixed on the second pig 25, not on the cord 14 as the connecting means. The second pig 25 cuts the sphere forward and backward on a plane passing through the center, and forms a pair of hemispherical pig bodies 25.
a, 25b, and the two members are again connected by a rigid rod-shaped connecting means in a state where they are separated by a fixed distance. It is externally fitted and fixed to this connecting means. In the case of the embodiment shown in FIG. 5, if the cord-like body 14 has a very small bending resistance, there is an advantage that it passes through the bend portion of the tube to be inspected more easily. But on the other hand,
The distance between the liquid ring pig 20 and the second pig 25, in other words, the distance from the seal portion 21 of the liquid ring pig 20 to the inspection sensor 10 changes within the length of the cord 14. In order to obtain the same, the liquid level in the pressure-resistant container 60 corresponds to the position of the liquid sealing pig 20 in the target pipe, but does not accurately indicate the position of the inspection sensor 10. Therefore,
In order to configure the cord-like body 14 of the embodiment of FIG. 5 from a material having extremely small deflection resistance and to perform the in-pipe inspection while accurately recognizing the position of the inspection sensor 10 based on the liquid level in the pressure-resistant container 60. The measurement is preferably performed while holding the signal line 30 in a state of being pulled by a predetermined force from the open end side of the lamp outer tube 44, that is, in a state where the cord 14 is straightened by the tension.

<2> The inspection pig unit 3 shown in FIG. 6 is also a modification of the inspection pig unit 1. The liquid sealing pig 23 included in the inspection pig portion 3 has a shape such that two spheres are brought close to each other and fused near the opposing surface. Pig for liquid ring 2
The front end of 3 is a generally spherical front pig portion 23a, and the front pig portion 23a is provided with a seal portion 21 that fits the inner surface of the tube to be inspected over the entire circumference in the radial direction. On the other hand, the rear side of the liquid sealing pig 23 has a close contact portion 26 ''.
The rear pig portion 23b has the following. Front pig part 2
3a, a sealing portion 21 of the rear pig portion 23b
Because these are spaced apart from the 6 '' in the axial direction,
It functions as a posture holding means for keeping the posture of the liquid sealing pig 23 with respect to the axis of the tube to be inspected constant. Rear pig portion 23b
A rigid fixing rod 12 (an example of a fixing means) is provided at the rear end of the fixing rod 12. The fixing rod 12 serves as a positioning means for externally fixing the inspection sensor 10. A signal cable 30 connected to the inspection sensor 10 extends from the fixed rod 12.

<3> From the inspection sensor 10 to the lamp outer tube 4
4, a signal line 30 extending to the outside air side through the open end
Is made of a material that is not easily expanded or contracted by a tensile stress, and a scale or a numerical value indicating the length from the inspection sensor 10 is written on the signal line 30, and the signal line 30 is lit at all times or at an appropriate time when necessary. If the in-pipe inspection is performed while maintaining the state where the outer and inner pipes 44 are pulled from the open end side, the pressure vessel 6
The accurate position of the inspection sensor 10 can be known from the scale or the numerical value written on the signal line 30 instead of the liquid level within 0. This alternative embodiment can be applied to the case of the inspection pig unit of any of the embodiments. The material of the signal line 30 that is not easily expanded and contracted by the tensile stress is composed of two linear members extending in parallel with each other by a covered conductor wire that is easily expanded by the tensile stress and a steel wire that is not easily expanded and contracted. In this case, the graduations and numerical values may be written on the linear body that is less likely to expand and contract. When the position of the inspection sensor 10 is viewed, the scales and numerical values may be read with reference to the outer surface of the rubber plug 54.

[Brief description of the drawings]

FIG. 1 is a perspective view of an inspection pig portion of an in-pipe inspection apparatus according to the present invention.

FIG. 2 is a process diagram of an in-pipe inspection method using the inspection pig portion of FIG.

FIG. 3 is a process diagram of the in-pipe inspection method continued from FIG. 2;

FIG. 4 is a process chart of the in-pipe inspection method continued from FIG. 3;

FIG. 5 is a perspective view of another embodiment of the inspection pig portion of FIG. 1;

FIG. 6 is a perspective view of still another embodiment of the inspection pig portion of FIG. 1;

FIG. 7 is a conventional schematic view of an in-pipe inspection apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inspection sensor 11 Connecting rod 20 Liquid sealing pig 21 Seal part 24 Second pig 26 Adhesion part 28 Liquid insertion part 100 Operation means

Claims (7)

[Claims] 1. An inspection pig portion comprising: an inspection pig portion; and operating means for moving the inspection pig portion in a direction of an axis of the inspection target tube via a predetermined liquid supplied into the inspection target tube. In addition, a liquid-sealing pig that can move in the axial direction of the pipe to be inspected while being fitted all around the inner circumference of the pipe to be inspected, and an inspection sensor for inspecting the inner surface of the pipe to be inspected. An in-pipe inspection device having positioning means for maintaining a constant relative position between the two members. 2. A positioning device comprising: a second pig having a contact portion with an inner wall of a pipe to be inspected; and a connecting means for connecting the second pig to the liquid sealing pig. A liquid insertion portion is provided in the second pig to allow the predetermined liquid to pass through the pipe to be inspected in the axial direction thereof,
The in-pipe inspection device according to claim 1, wherein the inspection sensor is fixed to the connection unit. 3. The positioning means includes a second pig which is movable with the liquid sealing pig in the pipe to be inspected, and the predetermined liquid passes through the pipe to be inspected in the axial direction thereof. The in-pipe inspection device according to claim 1, wherein a liquid insertion portion that allows the inspection is provided on the second pig, and the inspection sensor is fixed to the second pig. 4. A posture holding means for maintaining a constant posture of the liquid sealing pig with respect to the axis of the pipe to be inspected, and fixing the inspection sensor to the liquid sealing pig as the positioning means. The in-pipe inspection device according to claim 1, further comprising a fixing unit that performs the operation. 5. An in-pipe inspection method having the following steps: <1> A liquid-sealing pig having a seal portion fitted on the inner surface of an inspection object pipe in the entire circumference in a radial direction of the inspection object pipe; An inspection sensor for inspecting the inner surface of the pipe, and an in-pipe inspection apparatus having a positioning means for holding the inspection sensor at a predetermined position with respect to the liquid sealing pig, when the inspection target pipe is opened. A first step of inserting the inspection sensor into the pipe to be inspected so that the inspection sensor is located closer to the pipe end than the seal section from the pipe end, <2> the pipe end from the seal section in the pipe to be inspected A second liquid to be inspected by filling the space up to the predetermined liquid and pushing and pulling the filled predetermined liquid from the pipe end side to move the in-pipe inspection apparatus to a position to be inspected.
Process. 6. The in-pipe inspection method according to claim 5, wherein the second step has the following small steps: <2-1> The pipe inspection method includes: A first sub-step of filling a predetermined liquid, <2-2> connecting an air pressure operation means to the pipe end, depressing a liquid surface of the predetermined liquid by a gas under a pressurized state, The second small step of raising the liquid level. 7. A valve means capable of stopping the movement of the filled predetermined liquid in the pipe to be inspected, and the 2-2 sub-step includes the following sub-step.
The step of adjusting the position of the in-pipe inspection apparatus by operating the valve means.