JP3266793B2 - Sealing plug device for leak inspection of existing piping system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting an existing piping system such as a gas pipe, a water pipe or the like for leaks by using an airtight system to check whether or not a leak has occurred. The present invention relates to a sealing plug device for leakage inspection used for closing.

[0002]

2. Description of the Related Art As a method for inspecting whether or not a leak has occurred in an existing piping system, an airtight inspection means is known. As a prior art of this airtight type inspection means, for example, as described in JP-A-63-120237, an inflatable and contractible sealing plug is inserted into a pipe,
After moving this to an appropriate position, it is inflated to close the pipe to form a sealed space between the sealing plug and the pipe end, and by detecting the presence or absence of a pressure change in the sealed space. This is to check whether a leak has occurred in the pipeline.

According to the above-mentioned prior art, a sealing plug which is inflatable by injecting a pressurized fluid into the end of a hose is installed, and pressurization and negative pressure are applied before and after the sealing plug inserted into a pipe. This pressure causes the closure to move to a desired position within the tube.

[0004]

However, according to the above-described conventional example, the following problems occur. First, the existing piping system that performs a leak inspection by inserting a sealing plug is usually
There are a plurality of joints such as elbows in the middle of the pipeline. In this joint portion, the inner diameter of the pipe is slightly larger, and there are uneven steps on the inner surface of the pipe. Therefore, when the sealing stopper reaches the step, the sealing stopper becomes immovable, and there is a problem that the sealing stopper cannot be moved to a desired position.

[0005] Further, the conventional sealing stopper includes an inflatable body which expands by applying a fluid pressure to close the inside of the tube, and the inflatable body is formed of an elastic material such as rubber. Also, a flexible hose is used for supplying fluid pressure to the expansion body so as to have flexibility. However, in the above-mentioned piping situation, there are many projections and corners on the inner surface of the pipe, and the expansion body and the hose are damaged by the projections and corners during the movement of the sealing plug, and the inspection work cannot be performed. There is.

[0006] Further, in the leak inspection of the pipeline according to the prior art, the section of the pipeline to be inspected at a time needs to be set short because of the problem with the insertion property of the sealing plug as described above. There is a problem in that it is not possible to work efficiently when performing a leak inspection of a piping system across the system.

The present invention has been proposed in order to address the above-mentioned problem. Even if a section of a pipe line to be inspected at a time is set to be long, the sealing plug and the hose are not damaged without being damaged. It is an object of the present invention to provide a sealing device for leak inspection of an existing piping system, which can smoothly move a plug to a desired position in a pipeline and can accurately recognize the position of the sealing plug in the pipeline.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a sealing plug device for leak inspection of an existing piping system according to the present invention is used to seal a predetermined section of the piping system and pressurize the section. This is a sealing plug device used for a leak test of an existing piping system for detecting a leak in a pipeline by detecting a pressure change of the seal pipe, and has the following features.

(1) A sealing plug which is inserted into a pipe of an existing pipe and is inflated at a required moving position to close a pipe line and contracted so as to be movable in the pipe, and expansion and contraction of the sealing plug. Supply fluid pressure to the sealing stopper via a hose
A pressure-feeding / suctioning mechanism to be eliminated, an insertion wire consisting of a spiral coil spring surrounding the hose and having a distal end connected to the sealing plug, and sending and pulling back of the inserting wire, and connecting the sealing plug at the distal end to the pipeline. And an insertion amount display mechanism for measuring and displaying the amount of feed of the insertion wire. (2) The sealing plug has a shaft body having a fluid pressure supply passage and capable of extending and contracting in the axial direction, and is surrounded by the outer periphery of the shaft body and expanded into a cylindrical ring by the supply of the fluid pressure from the supply passage. An inflatable body and a spherical cap that is divided into two parts before and after the shaft body. When the shaft body is extended, the half-split cap is separated to form a swelling gap of the expandable body, and when the shaft body is contracted, A protection cap installed on the shaft so as to surround the outer periphery of the inflatable body so that the half-split cap comes into contact with the inflatable body to be housed therein. (3) The sealing plug moving mechanism is rotatably installed around a central axis of a shaft to which the rear ends of the hose and the insertion wire are connected, and accommodates the extra length of the hose and the insertion wire therein. Together with a storage drum provided with a delivery port for taking in and out the hose and the insertion wire on the center axis,
A drive means for rotating the storage drum so that the rotation direction can be switched, and a feed mechanism provided in front of the feed port for converting the rotation of the insertion wire into an axial movement. (4) The shaft portion of the storage drum is connected to a supply pipe of the pressure sending / suction mechanism via a rotary joint. (5) The hoses described above are connected by a joint that absorbs torsion every predetermined length. (6) The insertion amount display mechanism includes a first gear that rotates with the storage drum, a second gear that meshes with the gear at a predetermined gear ratio, and a counter that counts and displays the number of rotations of the second gear. Consists of The second gear is detachably mounted on the first gear.

[0010]

According to the above construction, the sealing plug expands by pressurization from the pressure-feeding / suction mechanism, makes close contact with the inner surface of the pipe, closes the inside of the pipe, and completely contracts and moves by the suction action of the pressure-feeding / suction mechanism. It is possible. A hose that transmits pressure and suction from the pressure-feeding / suctioning mechanism to the sealing stopper is wound with an insertion wire made of a spiral coil spring over the entire length. The insertion wire surrounds and protects the circumference of the hose, has sufficient waist strength to feed the sealing plug, and has flexibility to bend flexibly in accordance with the bent portion of the conduit. Then, send out to this insertion wire,
A sealing stopper moving mechanism for pulling back is provided to move the sealing stopper attached to the distal end of the insertion wire to a required position in the tube. Further, an insertion amount display mechanism is provided to accurately confirm the position of the sealing plug in the pipe.

[0011] The structure of the sealing plug is such that an expandable body is mounted on the outer periphery of an extensible shaft, and a protective cap is further mounted on the outer periphery. The protective cap is a spherical body divided into two parts in the front and rear and covers the periphery of the inflatable body, the front half-split part is attached to the front of the shaft, and the rear half-split part is attached to the rear of the shaft, A gap is formed by the expansion of the shaft body, which breaks and the expansion body swells. Therefore, when pressure is supplied to the sealing plug, the inflatable body expands and pushes the protective cap open, swells from the gap between the formed protective caps, and expands into a cylindrical ring to close the inside of the tube. On the other hand, when suction acts on the sealing stopper, the inflatable body contracts and fits in the protective cap, and at the same time, the protective cap is in a closed state.

The sealing stopper moving mechanism rotates a spiral insertion wire around an insertion axis, and converts the rotation of the insertion wire into an axial movement by a feed-out mechanism. And pulling out and pulling out hoses. Here, in order to rotate the insertion wire around the axis, the storage drum to which the rear end of the insertion wire is connected is driven to rotate around the center axis of the drum, and the insertion wire is fed from a payout port provided on the center axis. It is done by withdrawing. The extra length of the pulled back hose and the insertion wire is stored inside the storage drum, and the rear end of the hose and the insertion wire is connected to the shaft of the storage drum. This shaft is connected to the supply pipe of the pressure sending / suction mechanism by a rotary joint to send the pressure to the hose.
Suction is performed. Further, the hose is connected by a joint portion for absorbing a twist at a predetermined length, thereby preventing the hose from being twisted when being pulled out or pulled back.

The insertion amount display mechanism determines and displays the insertion amount based on the number of rotations of the storage drum or the insertion wire. In the above-described sealing stopper moving mechanism, the helical pitch of the insertion wire per rotation of the storage drum or the insertion wire. Move by minutes. In consideration of this, the second gear meshes with the first gear rotating together with the storage drum at a predetermined gear ratio, the number of rotations of the second gear is measured by a counter, converted into an insertion length and displayed. I have. The first gear and the second gear are detachably mounted, and the first and second gears are kept apart when the insertion amount is not measured.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

[Overall Structure of Sealing Plug Device] FIG. 1 is an external view of a sealing plug device for leak inspection according to an embodiment of the present invention. In the drawing, reference numeral 1 denotes a sealing stopper, reference numeral 2 denotes an insertion wire, and reference numeral 3 denotes a hose. The distal ends of the insertion wire 2 and the hose 3 are connected to the sealing plug 1. Further, the truck 4 having the moving wheels 5a and 5b has a pump 21, a water supply tank 22, which constitutes a pressure sending / suction mechanism, and a motor 31, a transmission means 32, a storage drum 33, which constitutes a sealing stopper moving mechanism. A feeding mechanism 34, a guide cylinder 35 and the like are mounted.

[Sealing Plug] FIG. 2 is a sectional view of a sealing plug in a sealing plug device for leak inspection according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a shaft, and the shaft 10 is
0a and a rear part 10b. The front portion 10a of the shaft body 10 is formed with a convex portion at the rear, and the rear portion 10b is formed with a concave portion which fits with the convex portion of the front portion 10a at the front, and the concave and convex portions are slidably fitted. Thus, the entire length of the shaft body 10 is formed so as to be able to expand and contract in the front-rear direction.

An inflatable body 11 is mounted on a side surface of the shaft body 10 so as to straddle a front portion 10a and a rear portion 10b. The inflatable body 11 is formed of an elastic material such as rubber, and natural rubber (NR) and styrene-butadiene rubber (S
BR) synthetic rubbers are suitable. The form of the expansion body 11 is a barrel-shaped cylindrical body, the front end of which is a front part 10 a of the shaft body 10.
The rear end portions are hermetically attached to the rear portion 10b. A concave portion 1 is provided on the outer periphery of the central portion of the expansion body 11.
1a is formed, and the recess is filled with grease.

Further, a protective cap 12 is attached to the outer peripheral surface of the shaft body 10. The protective cap 12 is made of metal or hard resin, and is generally spherical as a whole.
The front half-split cap 12 which is divided into two parts at the center
a and the rear half-cap 12b are abutted. The front half-split cap 12a is
The rear half-cap 12b is attached to the front
0 is attached to the rear part 10b, respectively, and the protective cap 1
2 as a whole surrounds the outer periphery of the expansion body 11.

A fluid supply passage 10c is provided inside the shaft 10, and the passage 10c is
Open into the fluid-filled space of the expansion body 11 on the side surface. A hose 3 connected to the passage 10c is attached to the rear of the shaft body 10, and an insertion wire 2 made of a spiral coil spring is attached to the outer periphery of the hose 3. A guide wire 13 is mounted in front of the shaft 10 in the traveling direction.

When the sealing plug 1 is inserted into the pipe, it is inserted in the state shown in FIG. In this state, since the inflatable body 11 of the sealing plug 1 is housed in the protective cap 12, the inflatable body 11 is not damaged even if a projection or the like is present in the pipeline, and the spherical protective cap 12 is not damaged. Is the outer shell of the sealing plug, so that it can move smoothly without resistance or snagging. Further, by the action of the guide wire 13 provided in the traveling direction of the sealing plug, even if there is a curved pipe portion, it can be smoothly inserted along the form of the pipe.

In order to move the sealing plug 1 to a required position to expand the sealing plug, pressure is supplied to the passage 10c of the shaft 10 from the pressure sending / suction mechanism described later via the hose 2 to thereby expand the sealing plug. The body 11 slightly expands, and the shaft body 10 expands due to the expanding action, whereby the half-split caps 12a and 12b of the protective cap 12 are separated to form a gap therebetween. When the pressure is further increased, the inflatable body 11 swells out of the gap and expands in a cylindrical annular shape (tire tube shape) so as to be in close contact with the inner surface of the pipeline to close the pipeline. At this time, by filling the concave portion 11a on the outer periphery of the inflatable body 11 with grease, the resistance when the inflatable body 11 swells from the gap of the protective cap is reduced, and when the inflatable body 11 expands and comes into close contact with the inner surface of the pipe. The surface of the inflatable body 11 is protected by the presence of grease in the contact surface portion, and the sealing effect is enhanced by the presence of grease.

[Pressure / Suction Mechanism] FIG. 3 shows an example of a pressure / suction mechanism for supplying / removing fluid pressure to / from the sealing plug 1 via the hose 3. Reference numeral 22 denotes a water supply tank, reference numeral 21 denotes a pump, reference numeral 23 denotes a pressure gauge, reference numeral 24 denotes a relief valve, and reference numerals 25 to 26 denote stop valves. A hose 3 provided inside the insertion wire 2 includes a pump 2
The supply pipe 28 connected to the water supply tank 22 via the first pipe 1 is connected by a rotary joint 36 of the storage drum 33. The pump 21 is a manual reciprocating pump that performs a compression or suction operation as shown by an arrow, and selectively opens and closes stop valves 26 and 27 at that time to supply water to the hose 3 and seal the stopper. , Or water absorption from the hose 3 and supply of negative pressure to the sealing stopper. Pressure setting of pressurization is set to 4.5kg / cm ² ~5.0kg / cm ² by the relief valve 24. Further, a lock mechanism is provided on a handle portion of the pump 21 so that the operation of the pump 31 is locked when the pump 31 is compressed or sucked, so that the supply pressure state can be maintained.

In order to supply pressure to the sealing plug 1, the stop valve 26 in front of the water supply tank 22 is opened, the pump 21 is operated to suck water, and water is taken into the pump cylinder. Then, the stop valve 26 is closed and the stop valve 27 is opened. In this state, the pump 21 is operated to compress and supply water to the supply passage 10c in the shaft 10 of the sealing plug 1 through the hose 3 and pressurize.

In order to make the sealing plug 1 movable from the closed state to the movable state, the stop valve 26 is closed and the stop valve 27 is opened. In this state, the pump 21 is suctioned to be fed into the expansion body 11 of the sealing plug. The drained water is drawn back into the cylinder of the pump 21. As a result, the inflatable body 11 is contracted. However, by further suctioning, a negative pressure is applied to completely contract the inflatable body 11 and house it in the protective cap 12.

[Sealing Plug Moving Mechanism and Insertion Amount Displaying Mechanism] The sealing plug moving mechanism will be described with reference to FIG.
The storage wire 33 to which the rear end is connected is driven to rotate about the center axis 30 of the drum, and the insertion wire 2 is pulled out from a feed-out port 33a provided on the center axis 30 so that the insertion wire 2 itself is connected to the center axis. It is rotated around 30. The storage drum 33 is a hose 3 pulled back inside.
And a storage portion in which the extra length of the insertion wire 2 is stored,
It is rotationally driven via a belt transmission mechanism 32 by a motor 31 capable of switching between forward and reverse rotation. The rear end of the hose 3 is connected to the shaft of the storage drum 33, and this shaft is connected to the supply pipe of the pressure-feeding / suction mechanism by a rotary joint.

Further, the hose 3 is connected by a joint 3a for absorbing torsion at every predetermined length, and
This prevents twisting when pulling back. And the insertion wire 2
Is converted into axial movement by a feeding mechanism 34 provided in front of the feeding port 33a, so that the insertion wire 2 is pulled out and pulled back. Here, as means for grasping the insertion amount of the insertion wire 2, the hose is color-coded from the distal end side of the hose 3 to the joint portion. For example, as shown in FIG. 4, the color of the first-stage hose is white, the color of the second-stage hose is black, and hereafter red, blue,
A set of six types of colors, yellow and green, is connected in this order. By visually observing the color of the hose at the insertion opening of the conduit, for example, if the color of the hose on the front stage is yellow and the color of the hose on the rear stage is blue with the joint 3a interposed therebetween, It can be confirmed that 20 m has been inserted. In this manner, the hoses are color-coded, and the insertion amount of the insertion wire 2 can be confirmed by the combination of the colors.

The feeding mechanism 34 and the insertion amount display mechanism will be described with reference to FIG. Feeding mechanism 3
4 is the insertion wire 2 pulled out from the payout port 33a.
The guide member 36 having a groove corresponding to the helical pitch of the coil spring is brought into contact therewith. When the guide member 36 abuts on the insertion wire 2, the rotating insertion wire 2 moves in the axial direction by the helical pitch of the coil spring in one rotation, whereby the insertion wire 2 is pulled out and pulled back. .

The insertion amount display mechanism determines and displays the insertion amount based on the number of rotations of the storage drum 33 or the insertion wire 2. The first gear 4 that rotates together with the storage drum 33 is displayed.
1 is meshed with the second gear 42 at a predetermined gear ratio, the number of revolutions of the second gear 42 is measured by a counter 43, converted into an insertion length, and displayed. Also, the first gear 41 and the second gear 42
Is detachably mounted, and when the insertion amount is not measured, the first and second gears are separated from each other.

[Piping System Leakage Inspection Method Using Sealing Plug Device of Embodiment] A leakage inspection method for an existing pipeline using the above sealing plug device will be described with reference to FIG. In the figure, reference numeral 51 denotes an existing pipeline, and a large number of pipe joints such as elbows 52 are interposed in the pipeline 51. A first opening 53 is provided at one end of the conduit, and a second opening 5 is provided at the other end.
4 are open, and the total length of the existing pipeline 51 is L
It is.

A sealing jig 55 is provided in the first opening 53, and a pressure pump 5
6 and a pressure gauge 57 are provided so as to be in communication with the conduit 51. Further, a sealing jig 58 is provided in the second opening 54, and the sealing jig 58 is provided as described above.
Is provided so that the pressurizing pump 56 and the pressure gauge 57 are in communication with the conduit 51.

The existing pipeline 51 constructed and installed as described above
Is to be inspected, a leak inspection of the existing pipeline 51 is performed. First, the sealing plug 1 is inserted into the existing pipe 51 through the first opening 53.
Is inserted into the conduit 51, and the sealing plug 1 is inserted to the vicinity of the middle part of the inspection section, and is fixed at that position. Then, the above-described pressure-feeding / suctioning mechanism is operated to supply pressure to the sealing plug 1 via the hose 3 to expand the sealing plug 1 to close the inner surface of the conduit at that position.

When the closing of the inside of the pipe by the sealing plug 1 is completed, the pressure pump 56 on the side of the first opening 53 and the side of the second opening 54 is driven to perform an airtight inspection for checking the pressure state in the closed space. Do. As a result of this airtight inspection, if the first opening 5
When a pressure change is confirmed in the pipeline on the side of No. 3, it can be determined that there is a leak point in the pipeline on the first opening side. Therefore, the sealing plug 1 is once contracted so that the first opening 53
Back to the required amount, expand again and conduct an airtight test.
Identify the location where the leak occurred. Further, the second opening 54
When it is determined that there is a leakage point on the side side, particularly when the pipeline in the inspection section is long, the sealing plug is inserted into the pipeline through the second opening 54 of the existing pipe, and the sealing plug 1 is inserted. Then, the sheet is conveyed to the substantially central position of the existing pipeline 51, and then pulled back to the second opening 51 side by a required amount, expanded and subjected to an airtight test to specify a leak occurrence position.

[0033]

Since the present invention is configured as described above,
The following effects are obtained. (1) The waist is strong enough to feed the sealing plug,
By connecting a sealing plug to the tip of an insertion wire composed of a coil spring having flexibility and being flexibly bent in accordance with a bent portion of a pipeline, smooth penetration can be obtained even in a piping system having a curved pipe portion. In addition, since the insertion distance can be made long, the target section in one inspection can be made long, and the inspection work can be made more efficient when inspecting a wide range of piping systems. (2) The sealing plug is connected to a pressure-feeding / suctioning mechanism capable of suctioning for contracting the sealing plug together with sending pressure for expanding the sealing plug, so that the sealing plug can be reliably expanded. In addition, the sealing stopper can be completely contracted when the sealing stopper is moved, and damage during movement of the sealing stopper can be avoided. (3) By covering the outer shell of the sealing plug with a spherical protective cap, smooth insertion can be obtained even in a pipe system having a curved pipe portion or an uneven portion, and the protective cap expands when the sealing plug is moved. Is covered and protected, so that the expansion body can be prevented from being damaged. (4) Opening and closing operations for separating and contacting the protective cap need only be operations of supplying and removing pressure to the inflatable body.
The operation is not complicated even if the protective cap is provided. (5) The entire area of the hose connected to the sealing plug is covered with the insertion wire, so that the hose is not damaged. (6) By providing the sealing plug moving mechanism for pulling out or pulling back the insertion wire, the sealing plug can be quickly moved to a required position. (7) By providing the insertion amount display mechanism, it is possible to accurately install the sealing plug at a required position in the pipe, and it is possible to increase the accuracy of specifying the leak location.

[Brief description of the drawings]

FIG. 1 is an external view of a sealing plug device for leakage inspection according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a sealing plug in the sealing plug device for leakage inspection according to the embodiment.

FIG. 3 shows the pressure transmission and the pressure in the sealing plug device for leakage inspection according to the embodiment.
It is an explanatory view showing a suction mechanism.

FIG. 4 is an explanatory diagram showing a color arrangement of a hose.

FIG. 5 is an explanatory view showing a feed-out mechanism and an insertion amount display mechanism in the sealing plug device for leakage inspection according to the embodiment.

FIG. 6 is an operation explanatory view according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 sealing plug 2 insertion wire 3 hose 4 carriage 5a, 5b wheel 10 shaft 11 expansion body 12 protective cap 13 guide wire 21 pump 22 water supply tank 23 pressure gauge 24 relief valve 25, 26, 27 stop valve 28 supply pipe 30 central axis DESCRIPTION OF SYMBOLS 31 Motor 32 Power transmission mechanism 33 Storage drum 34 Feeding mechanism 35 Guide cylinder 36 Guide member 41 First gear 42 Second gear 43 Counter 51 Existing pipeline 52 Elbow 53 First opening 54 Second opening 55 Sealing jig 56 Pressure Pump 57 Pressure gauge 58 Sealing jig

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiro Ozawa 204-9, Oizumi-ji, Kasugai-shi, Aichi Prefecture (72) Inventor Masao Kimura 26, Yokocho, Inuyama-shi, Aichi Prefecture (72) Inventor Keijiro Hori Minami Edogawa-ku, Tokyo Kasai 7-2-5-704 (56) References JP-A-61-29759 (JP, A) JP-A-64-54216 (JP, A) Jikai Sho 63-107838 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G01M 3/28 G01M 3/26

Claims (6)

(57) [Claims] 1. A sealing plug device used for a leak inspection of an existing piping system for checking a leak in a pipeline by detecting a pressure change after pressurizing the predetermined section of the piping system and sealing the section. A sealing plug that is inserted into a pipe of an existing pipe, expands at a required moving position to close the pipe line, and contracts to move in the pipe, and for expansion and contraction of the sealing plug. A pressure-feeding / suctioning mechanism for supplying / removing fluid pressure to / from the sealing plug via a hose, an insertion wire formed of a spiral coil spring surrounding the hose and having a tip connected to the sealing plug, and the insertion wire perform the delivery and retraction, e Preparations and sealing plug moving mechanism for moving the sealing plug of the tip to a desired position of the conduit, and an insertion amount display mechanism for displaying metered feed amount of the insertion wire, the sealing cap Supply of fluid pressure With passage and axial
A shaft body that can be extended and retracted, and the supply member that is surrounded by the outer periphery of the shaft body.
A swelling that expands in a cylindrical ring by the supply of fluid pressure from the passage
Upholstery and spherical cap divided into two parts before and after the shaft
When the shaft is extended, the half-split caps separate
To form a swelling gap of the above-mentioned expanding body.
The cap of the crack comes in contact and stores the expansion body inside
Installed on the shaft body so as to surround the outer periphery of the expansion body
Existing piping characterized by comprising a protective cap
Sealing device for system leak inspection. 2. The sealing stopper moving mechanism is rotatably installed around a central axis of a shaft to which the rear ends of the hose and the insertion wire are connected, and accommodates the extra length of the hose and the insertion wire therein. A storage drum provided with a feed-out port on the central axis for taking in and out the hose and the insertion wire; driving means for rotating the storage drum so that the rotation direction can be switched; and a drive drum provided in front of the feed-out port. 2. The sealing plug device for leak inspection of an existing piping system according to claim 1, further comprising a feeding mechanism for converting rotation of the insertion wire into movement in an axial direction. 3. The leak inspection of an existing piping system according to claim 2 , wherein a shaft part of the storage drum is connected to a supply pipe of the pressure-feeding / suction mechanism via a rotary joint. Sealing stopper device. Wherein said hose, 請 characterized in that it is attached in the joint portion to absorb twisting every predetermined length
The sealing plug device for leak inspection of an existing piping system according to any one of claims 1 to 3 . 5. The insertion amount display mechanism counts and displays a first gear that rotates with the storage drum, a second gear that meshes with the gear at a predetermined gear ratio, and the number of rotations of the second gear. The sealing plug device for leak inspection of an existing piping system according to claim 2 , comprising a counter. Wherein said second gear, has been existing piping system leak testing sealing plug device according to claim 3, characterized in that it is freely mounted detachment with respect to the first gear.