JP2004125133A - Seal plug device for original arrangement and original arrangement sealing work method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further improve workability in a seal plug device for original arrangement and an original arrangement sealing work method. <P>SOLUTION: When a seal plug body 10 reaches a proper position in a branch joint when the seal plug body 10 is pressed into a conduit to be an original arrangement object, a lock pin 14 positioned at the tip part of the seal plug body 10 is expanded at that position and holds the seal plug body 10 at a proper position in the branch opening because the restraint of the lock pin by the inner surfaces 50A and 50B of the branch opening is released. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an original arrangement sealing plug device and an original arrangement sealing method using the same.
[0002]
[Prior art]
Generally, a gas pipe branches a pipe (supply pipe) from a cast iron pipe (main pipe) piped under a road via a branch joint, and pipes the pipe to a demand destination. The branched pipe may become unused due to circumstances of the demand destination. In such a case, the work of sealing the branch source and removing the unused pipe is carried out. I'm calling
[0003]
In some cases, the branch joint is removed from the main pipe and the branch hole of the main pipe is plugged.However, in consideration of the reuse of the branch joint, the branch joint is left attached to the main pipe. Conventionally, a method of sealing the inside of the branch joint with a sealing plug device for original arrangement has been used. A prior art (see, for example, Patent Document 1) of such an original arrangement seal plug device and an original arrangement seal method will be described with reference to FIGS.
[0004]
FIG. 8 is an explanatory view showing the entire structure of the original rearranging seal stopper device. As shown in FIG. 1A, the original sealing plug device 100 includes a sealing plug 110 and an insert 120. The seal plug 110 (FIG. 2B shows a cross-sectional view thereof) has a large degree of freedom in the radial direction as a gas blocking material, and its surface is slippery and has low resistance even if the diameter is reduced. A plug body 111 made of a porous sponge material is provided. The sponge body 111 is made of the above-described sponge material by itself into a truncated cone shape having a gentle taper surface 111b, a hole 112 penetrating at the center, and a concave portion 113 provided on the large diameter side so as to be easily deformed. Is formed. The plug body 111 is inserted into the center hole 112 via the blind plate 114 from the side of the recess 113, and is tightened by a nut 117 via a holding plate 116 at the tip. The socket 115 is integrally attached to the socket 115 by bonding. The socket 115 is provided with an adapter 118 having a rectangular engaging hole 118a at an end thereof.
[0005]
On the other hand, the insertion tool 120 includes a center stem 121 and an insertion stopper 122 provided on the base end side of the center stem 121, and a distal end of the center stem 121 has an engaging portion that engages with the engaging hole 118 a of the adapter 118. 121a are formed.
[0006]
FIG. 9 is an explanatory diagram for explaining the original arrangement sealing method using the original arrangement seal plug device 100. As shown in FIG. First, a ball hole 132 is opened near the branch joint 131 in the unused conduit 130, the gas bag 133 is inserted into the inside, and the gas bag 133 is inflated and brought into close contact with the inner surface of the pipe. Is performed to temporarily shut off the gas supply. This step is an operation for a pipe in an active pipeline state, and is performed by a no-blow operation using a conventionally used no-blow bag. Thereafter, the no-blow bag is removed, the downstream side of the conduit 130 is purged with gas, and the conduit 130 is cut into a short length of, for example, about 50 cm (see FIG. 3A).
[0007]
Then, the original sealing plug device 100 is set at the open end 130a of the cut conduit 130, and the engaging portion 121a of the center stem 121 is engaged with the engaging hole 118a of the adapter 118 of the sealing plug 110 and connected. Then, the sealing plug 110 is pushed in from the opening end 130a (FIG. 2B).
[0008]
Further, by pushing the seal plug 110 into the conduit 130, the conduit 130 is sealed by the seal plug 110, so that the gas bag 133 becomes unnecessary. The gas bag 133 is removed from the conduit 130, and the seal plug 110 is further pushed in toward the branch joint 131 of the conduit 130 (FIG. 3 (c)).
[0009]
Here, the cutting length L of the conduit 130 is set according to the length of the center stem 121 ahead of the insertion stopper 122, and the sealing plug 110 is kept until the insertion stopper 122 contacts the open end 130a of the conduit 130. , The seal plug 110 finally reaches the inside of the branch opening of the branch joint 131. As a result, the gas in the conduit 130 can be reliably blocked from the root by the seal plug 110 (see FIG. 4D). Thereafter, the conduit 130 is removed from the branch joint 131, and the opening of the branch joint 131 is further sealed to complete the original rearranging operation.
[0010]
[Patent Document 1]
JP-A-6-50489
[Problems to be solved by the invention]
Even in such a conventional technique, it has been demonstrated that sufficient airtightness and reliable safety can be ensured during the process of the original sorting work or after the completion of the original sorting work. However, it has still been improved to meet the requirements of further improving the uniformity of the airtight state, further increasing the versatility of the pipe shape, further improving workability during construction, and further improving the sealing performance. There is room for
[0012]
In other words, the conventional sealing plug device for rearranging includes a plug body having a truncated cone shape, and is sealed in a state where the taper surface of the plug body is partially crushed against the inner surface of the branch joint. According to this, if there is a slight difference in the branch opening diameter due to uneven wall thickness in the branch joint or molding error of the branch joint, the degree of collapse of the tapered surface will be slightly different, and although it is within the allowable range, it is airtight. A difference occurs in the state, and uniform airtightness may not be obtained for all branch joints.
[0013]
In addition, since the plug body is pushed from the inside of the conduit into the branch joint using the center stem, it is a device dedicated to straight conduits, and is less versatile for different types of conduits such as bent tubes. There is.
[0014]
Also, in order to push the sealing plug into the correct position in the branch joint, it is necessary to accurately measure and cut the length of the conduit from the insertion stopper according to the length of the center stem ahead. If required, there is a problem that it takes time to measure the cutting length and the workability deteriorates. In addition, since there is a possibility that a measurement error may occur for each measurer in measuring the cut length, there is a problem that although there is an allowable range, there is a slight individual difference in the insertion position of the seal stopper.
[0015]
Furthermore, even at the time of taking out work for reusing the branch joint, it is required that the branch opening is securely sealed until the sealing stopper is removed, so a sealing stopper having higher sealing performance is required. I have.
[0016]
The present invention has been proposed in order to cope with such a situation, and in the original rearranging seal plug device and the original rearranging sealing method, it is possible to obtain a more uniform airtightness, a device for the shape of the pipe and The purpose is to increase the versatility of the work, to further improve the workability, and to further improve the sealing performance.
[0017]
[Means for Solving the Problems]
In order to achieve such an object, the present invention has the features specified by the following claims.
[0018]
First, as an original arrangement seal plug device, the invention according to claim 1 is an original arrangement seal plug device for sealing a branch opening in the branch joint at the time of original arrangement work of a conduit branched via a branch joint. In the, provided with a seal plug inserted along the conduit to seal the branch opening, at the tip of the seal plug, deployed at a position where the constraint received from the inner surface of the branch opening is released, the A lock pin is provided for holding the sealing plug at an appropriate position in the branch opening.
[0019]
The invention according to claim 2 is based on the seal plug device for original arrangement of claim 1, wherein the seal plug is formed of a plug body made of an elastic member pressed against the inner surface of the branch opening, and a tip of the plug body. A support member comprising a support plate for supporting the surface, a support shaft mounted on the support plate, penetrating the plug body from the front end to the rear end, and projecting toward the rear end side; It is characterized by comprising a compression plate that comes into contact with and compresses and expands the plug body along the support shaft, and a compression tool that slides the compression plate along the support shaft.
[0020]
The invention according to claim 3 is based on the original rearranging seal stopper device of claim 2, wherein the side surface of the stopper main body is formed from a cylindrical surface pressed against the inner surface of the branch opening by the compression expansion and the cylindrical surface. And a tapered surface whose diameter is increased rearward.
[0021]
According to a fourth aspect of the present invention, based on the seal plug device for rearranging according to the second and third aspects, a compression operation insertion tool including a grip portion for compressing the compression tool and inserting the seal plug body. Is further provided.
[0022]
As an original arrangement sealing method using an original arrangement sealing device having such a feature, the invention according to claim 5 is a method for performing an original arrangement work on a pipe branched via a branch joint. In the original rearranging sealing method for sealing an opening, a step of temporarily sealing the conduit near the branch joint and cutting the conduit downstream of the temporary sealing position; After inserting the seal plug of the rearranging seal plug device and removing the temporary sealing, pressing the seal plug from the rear end side, pushing the seal plug to the branch opening of the branch joint, A step of confirming that the lock pin provided at the tip of the seal plug is released from the restraint received from the inner surface of the branch opening and unfolds, and that the seal plug is held at an appropriate position in the branch opening. The said sea And having at least a step of compressing expanded the plug body in plug.
[0023]
According to the inventions according to the respective claims, the following operations are performed.
[0024]
First, the seal plug device for original arrangement of the present invention includes a seal plug inserted along an axis of a conduit to seal a branch opening of a branch joint. Since the lock pin is provided to deploy at the position where the restraint received from the inner surface of the opening is released and hold the seal plug at an appropriate position of the branch opening, when disposing the seal plug in the branch opening of the branch joint, By confirming that the lock pin has been deployed, it can be confirmed that the seal plug has been properly positioned. Therefore, good workability can be obtained, and the seal stopper can be pushed into an appropriate position no matter who works.
[0025]
In addition, since the insertion position of the sealing plug can be accurately positioned without using the insertion stopper provided on the center stem as in the prior art, it is possible to insert the sealing plug without using the center stem. Thus, a highly versatile device can be provided for not only a straight conduit but also various forms of conduit such as a bent tube.
[0026]
Secondly, in addition to such an operation, a means is provided for compressing and expanding the plug body of the seal plug while the seal plug is pushed into the branch opening of the branch joint. It is possible to compress and expand the stopper main body and press it against the inner surface of the branch opening, so that high sealing performance can be obtained.
[0027]
Thirdly, in combination with the above-mentioned operation, the side surface of the plug body in the sealing plug is formed of a cylindrical surface and a tapered surface which increases in diameter rearward from the cylindrical surface. By compressing and expanding the diameter and sealing the branch opening, uniform airtightness can be obtained with a wide pressure contact area, and the airtightness during insertion of the conduit can be reduced by applying only pressure contact by the tapered surface. Can be reduced, and the work can be smoothly performed.
[0028]
Further, the lock pin provided around the distal end has a function of centering the front position of the seal plug when the seal plug is inserted, and the rear position of the seal plug is supported by the tapered portion. The plug is inserted in a proper posture along the pipe axis, and smooth insertion can be ensured.
[0029]
Fourthly, in addition to the above-mentioned operations, a compression operation insertion tool having a grip portion for compressing the compression tool provided on the rear end side of the seal plug and inserting the seal plug is further provided. Accordingly, the seal plug can be inserted by pushing the seal plug from the rear end side by holding the grip portion, and when the seal plug reaches the branch opening position, a compression operation can be performed to compress and expand the plug main body. In addition, when inserting the sealing plug, it is possible to perform the operation not only manually but also by using an automatic insertion device that performs remote control.In this case, the sealing plug is branched and opened through a somewhat long conduit. It can be inserted into.
[0030]
According to the original arrangement sealing method using such an original arrangement sealing plug device, it is possible to perform the operation irrespective of the shape of the pipe by having the above-described steps, and it is possible to perform the operation with high accuracy and in a short time. To complete the operation, and high sealing performance can be obtained.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 to FIG. 3 are explanatory views showing a seal plug device for original arrangement according to an embodiment of the present invention. The original rearranging seal stopper device according to this embodiment includes a seal stopper and a compression operation insertion tool. FIG. 1 is an explanatory view showing the structure of the seal stopper, and FIGS. 2 and 3 are compression operation insertion tools. FIG. 3 is an explanatory view showing the structure of FIG.
[0032]
In FIG. 1 (FIG. 1 (a) is a plan partial cross-sectional view, and FIG. 1 (b) is a front view), a sealing plug 10 is pressed against an inner surface of a branch opening of a branch joint to seal the branch opening 11. Is provided. The plug body 11 is an elastic member made of a porous sponge material, which is often used as a gas blocking material, has a large degree of freedom in radial deformation, and has a surface made to be slippery. A cylindrical surface 11a is formed in a region as wide as possible, and has a tapered surface 11b whose diameter is increased rearward from the cylindrical surface 11a and a cut surface 11c whose diameter is reduced forward.
[0033]
Further, the plug body 11 is provided with a cavity 11d inside in order to facilitate the compression and expansion deformation, and a through hole 11e penetrating from the front end to the rear end is formed in the center.
[0034]
The stopper body 11 has a front end face 11f supported by a support plate 12, and a support shaft 13 mounted on the support plate 12 is inserted into the through hole 11e. The support member protrudes toward the 11g side, and forms a support member that integrally supports the plug body 11 with the support plate 12 and the support shaft 13.
[0035]
A lock pin 14 is pivotally supported around the support plate 12 provided at the distal end of the seal plug 10. The lock pin is spring-biased so as to expand toward the periphery, and is held in a state where it is expanded in a direction along the support plate 12. When the resistance in the direction of the middle arrow is received, the stopper body 11 is folded along the side surface. Therefore, when the sealing plug 10 moves in the conduit, the lock pin 14 is in a folded state, and the lock pin 14 provided at the distal end abuts against the inner surface of the conduit by a spring bias, and the pressure of the spring is reduced. Work equally around the periphery to center the tip position of the seal plug 10.
[0036]
A compression plate 15 is in contact with the rear end surface 11g of the plug body 11. The support shaft 13 passes through the center hole of the compression plate 15, and the compression plate 15 can slide along the support shaft 13. A screw portion is formed on the rear end side of the support shaft 13, and a compression bolt 16 serving as a compression tool is screwed into the screw portion. Accordingly, by tightening the compression bolts 16, the compression plate 15 slides to the distal end side, and the plug body 11 is compressed between the support plate 12 and the compression plate 15 to be expanded in the circumferential direction. Become.
[0037]
A gas hole 13a passes through the inside of the support shaft 13, and the gas hole 13a is closed by mounting a purge pin 13b protruding from the rear end.
[0038]
2A and 2B show a compression operation range 20 in the compression operation insertion tool (FIG. 2A is a front view, FIG. 2B is an AA sectional view, and FIG. 2C is a BB sectional view). The compression operation range 20 includes a range hole 20a that fits into the compression bolt 16, and an operation unit 20b that fits the compression bolt 16 into the range hole 20a and screw-operates the compression bolt 16.
[0039]
FIG. 3 shows the gripper 30 in the compression operation insertion tool (FIG. 3A is a plan view, and FIG. 3B is a side view). The gripper 30 is attached to the rear end of the support shaft 13. The gripper 31 is gripped when the seal plug 10 is manually inserted into the conduit, and the support shaft 13 is compressed when the compression range 20 is compressed. And a shaft support groove 32 for checking the state of being pulled out by once pulling out the pushed-in seal plug 10.
[0040]
The operation of the original arrangement seal stopper device having such a structure will be described with reference to FIG. In the figure, reference numerals 40A and 40B denote imaginary lines indicating the inner surfaces of the conduits to be sorted out via the branch joints, and 50A and 50B denote imaginary lines indicating the inner surfaces of the branch openings of the branch joints. First, an example of the dimensions of the plug body 11 in the seal plug 10 will be described. Here, the outer diameter of the cylindrical surface 11a is formed to be slightly smaller than the inner diameter D1 of the conduit, and the outer diameter of the tapered surface 11b is mostly Is formed to be larger than the inner diameter D1 of the conduit. The maximum diameter of the tapered surface 11b is set to be slightly larger than or equal to the inner diameter D2 of the branch opening. The deployment width d1 when the lock pin 14 is deployed is set to be larger than the branch opening inner diameter D2.
[0041]
Such a seal plug 10 is configured such that an operator manually grips the holding part with the range hole 20 a of the compression operation range 20 fitted in the compression bolt 16 and the gripping tool 30 attached to the rear end of the support shaft 13. 31 is manually inserted in the direction of the arrow and inserted into the conduit. Here, the mode in which the seal plug 10 is manually inserted is described, but automatic insertion using the automatic insertion device is also possible as described above.
[0042]
When the inside of the conduit is inserted, the lock pin 14 is folded toward the side surface of the plug body 11 and slides along the inner surface of the conduit due to the restraining force received from the inner surface of the conduit. At this time, the tip of the seal plug 10 is centered in the conduit by the centering action of the lock pin 14 described above. Also, on the side surface of the plug body 11, only the tapered surface 11a is brought into pressure contact with the inner surface of the conduit, and the tapered surface 11a supports the rear part of the seal plug 10 on the inner surface of the conduit. Therefore, it can be inserted with a small contact area and in a proper posture along the tube axis while maintaining airtightness, and good insertion performance can be secured.
[0043]
When the seal plug 10 is further pushed in and reaches a proper position in the branch joint, the lock pin 14 located at the tip end of the seal plug 10 is released from the restraint received from the inner surface of the branch opening. Deploy in position to hold seal closure 10 in place. Therefore, by confirming that the lock pin 14 is deployed, the operator can know that the seal plug 10 is held at an appropriate position.
[0044]
After confirming that the sealing plug body 10 is held at the appropriate position in this manner, the compression operation range 20 is operated to tighten the compression bolt 16, and the plug main body 11 is compressed and expanded, and the inner surface of the branch opening is formed. The entire side surface of the plug main body 11 including the cylindrical surface 11a is brought into pressure contact.
[0045]
FIG. 5 to FIG. 7 are explanatory diagrams showing an example of the original arrangement sealing method using such an original arrangement seal plug device. Here, a 90 ° vent pipe is used as a conduit to be rearranged. However, the present invention is not limited to this, and a similar method can be applied to an S-shaped pipe, another vent pipe, or a straight pipe. .
[0046]
In the first step (see FIG. 5A), the conduit 40 in the active tube state is temporarily sealed by the same gas bag 133 as in the related art in the vicinity of the branch joint 50, and from there the downstream side. The supply of gas G to the gas is cut off. Then, the conduit 40 to be rearranged is gas-purged, and the conduit 40 is cut at a position SS on the downstream side with respect to the temporary sealing, for example, about 50 cm away from the branch joint 50.
[0047]
In the second step (see FIG. 5B), the sealing plug 10 with the compression operation range 20 and the gripper 30 attached to the rear end side is inserted from the cutting opening 40a of the conduit 40, and the cutting opening 40a is cut. The gas bag 133 is removed while maintaining the airtightness, and then the rear end side of the seal plug 10 is manually pushed to push the seal plug 10 to the branch opening 50 a of the branch joint 50.
[0048]
In the third step (see FIG. 6A), the seal pin 10 is further pushed in, so that the lock pin 14 is positioned at the appropriate position in the branch opening 50a as described above. Expands. This state can be confirmed by pulling the seal stopper 10 once. Here, a shaft support groove 32 is formed in the gripper 30 (see FIG. 3), and this is engaged with a projection provided at the rear end of the support shaft 13. The sealing plug 10 can be pulled back.
[0049]
As a fourth step (see FIG. 6B), after confirming that the seal plug 10 is held at an appropriate position in the branch opening 50a, compression is performed with the support shaft 13 fixed by the gripper 30. The operation range 20 is operated to compress and expand the plug body 11 between the support plate 12 and the compression plate 15 so that the side surface of the plug body 11 is pressed against the inner surface of the branch opening 50a. Then, the conduit 40 to be rearranged is removed from the branch joint 50 and removed.
[0050]
FIG. 7 is an explanatory diagram showing the state of the branch opening sealed after the final original rearranging work. The compression operation range 20 and the gripper 30 are removed from the seal plug 10, and a bowl-shaped bushing 53 is attached to the opening of the branch joint by a seal member 51 and a retaining ring 52. Thereafter, the purge pin is removed by operating from the opening 53a of the bushing 53, and the gas hole 13a in the support shaft 13 is opened to the rear end side of the seal plug 10 to generate gas pressure also at the rear end side of the seal plug 10. Let it. Then, by closing the opening 53a of the bushing 53 with the stopper 54, the original rearranging work is completed.
[0051]
In such an original sealing method, when targeting a straight conduit, if a special rod for remote operation is used to check the insertion and removal of the sealing plug 10 and perform a compression operation, etc. The above-described conduit cutting step can be omitted. Also in this case, it is possible to eliminate the conventional insertion position confirmation by the insertion stopper.
[0052]
According to the seal plug device for original arrangement of such an embodiment, when the seal plug 10 is arranged in the branch opening of the branch joint, it is confirmed that the lock pin 14 is expanded, so that the seal plug 10 is properly fitted. Since it is possible to confirm that the seal plug has been placed in a proper position, good workability can be obtained, and it is possible to push the seal plug into an appropriate position no matter who works.
[0053]
In addition, the seal plug 10 can be inserted manually or automatically without using a center stem, and a highly versatile device can be provided not only for a straight conduit but also for various types of conduits such as a bent tube. .
[0054]
Furthermore, since a means for compressing and expanding the plug body 11 of the seal plug 10 while the seal plug 10 is pushed into the branch opening of the branch joint is provided, the plug body made of an elastic member is compressed and expanded. And the branch opening diameter can be pressed, and high sealing performance can be obtained even if there is a slight difference in the branch opening diameter of the branch joint.
[0055]
Also, since the side surface of the plug body 11 in the seal plug 10 is formed of a cylindrical surface 11a and a tapered surface 11b whose diameter increases rearward from the cylindrical surface 11a, the cylindrical surface 11a is compressed and expanded. By sealing the branch opening, uniform airtightness can be obtained with a wide pressure contact area, and the airtightness during insertion of the conduit can be reduced by only pressing by the tapered surface 11b. A smooth work progress can be performed.
[0056]
Further, the lock pin 14 provided at the distal end of the seal plug 10 acts to center the distal end of the seal plug 10 when the conduit is inserted, and the rear portion of the seal plug 10 is supported on the inner surface of the conduit by a tapered surface. Therefore, at the time of insertion, the posture parallel to the tube axis is maintained, and good insertion performance can be ensured.
[0057]
And according to the original arrangement sealing method of the embodiment, by having the above-described steps, uniformity of airtightness can be obtained, and it is possible to perform the operation irrespective of the shape of the pipe, with high accuracy and in a short time. The operation can be completed and high sealing performance can be obtained.
[0058]
【The invention's effect】
Since the present invention is configured as described above, uniformity of airtightness can be obtained in the original sealing plug device and the original sealing method, and the versatility of the device and the operation with respect to the shape of the pipe can be improved, and the operation can be improved. Properties can be further improved, and the sealing performance can be further improved.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an original rearranging seal stopper device (seal stopper) according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a seal plug device for original arrangement (compression operation range) according to an embodiment of the present invention.
FIG. 3 is an explanatory view showing an original rearranging seal stopper device (gripping tool) according to an embodiment of the present invention.
FIG. 4 is an explanatory view showing an operation of the original rearranging seal stopper device according to one embodiment of the present invention.
FIG. 5 is an explanatory view showing an example of a source rearranging sealing method according to the embodiment of the present invention.
FIG. 6 is an explanatory view showing an example of a source rearranging sealing method according to the embodiment of the present invention.
FIG. 7 is an explanatory view showing an example of the original rearranging sealing method according to the embodiment of the present invention (the state of the branch opening sealing after the final original rearranging work).
FIG. 8 is an explanatory view showing a conventional prior art seal plug device for rearranging.
FIG. 9 is an explanatory view showing a conventional prior art sealing method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Seal plug 11 Plug main body 11a Cylindrical surface 11b Tapered surface 11c Cut surface 11d Cavity 11e Through hole 11f Tip surface 11g Rear end surface 12 Support plate 13 Support shaft 14 Lock pin 15 Compression plate 16 Compression bolt (compression tool)
Reference Signs List 20 compression operation range 30 gripper 40 conduit 40A, 40B conduit inner surface 50 branch joint 50A, 50B branch opening inner surface

Claims (5)

In the original rearranging work of the conduit branched through the branch joint, in the original rearranging seal stopper device for sealing the branch opening in the branch joint,
A sealing plug inserted along the conduit to seal the branch opening;
A lock pin is provided at a tip portion of the seal plug, which is developed at a position where a constraint received from an inner surface of the branch opening is released, and holds the seal plug at an appropriate position in the branch opening. The original sealing seal stopper device. The seal plug,
A plug body made of an elastic member pressed against the inner surface of the branch opening,
A support plate that supports the distal end surface of the plug body and a support member that is attached to the support plate and that includes a support shaft that penetrates the plug body toward the rear end from the front end and protrudes toward the rear end side;
A compression plate that abuts on a rear end surface of the plug body and compresses and expands the plug body along the support shaft;
The seal plug device for original arrangement according to claim 1, further comprising a compression tool that slides the compression plate along the support shaft. The side surface of the plug body has a cylindrical surface pressed against the inner surface of the branch opening by the compression expansion and a tapered surface expanded rearward from the cylindrical surface. Seal stopper device for the original rearrangement. 4. The original rearranging seal plug device according to claim 2, further comprising a compression operation insertion tool provided with a grip portion for compressing the compression tool and inserting the seal plug. 5. In the original arrangement work of the conduit branched through the branch joint, in the original arrangement sealing method for sealing the branch opening in the branch joint,
Performing temporary sealing on the conduit near the branch joint, and cutting the conduit downstream of the temporary sealing position;
After inserting the seal plug of the original rearranging seal plug device from the cutting opening and removing the temporary sealing, the seal plug is pressed from the rear end side, and the seal plug is moved to the branch opening of the branch joint. And the process of pushing
A step of confirming that the lock pin provided at the distal end of the seal plug is released from the restraint received from the inner surface of the branch opening and unfolds, and that the seal plug is held at an appropriate position in the branch opening. ,
And a step of compressing and expanding the plug body of the seal plug.

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