JP2005307454A - Plug device and piping member for drainage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost, facilitate handling, and increase usability in a piping member for drainage having an inspection hole and formed so that an inspection hole is closed to stop water when the inspection hole is not used. <P>SOLUTION: This plug device comprises a cover plate 16 brought into contact with the open end 13a of an opening part 12 to close the opening part, a back pressure loading member 17 formed in a size allowing the fitting thereof into the opening part 12 and held on the rear side of the cover plate 16 being superposed with each other, a plugging means 19 enabling the back pressure loading member 17 to be moved close to and away from the cover plate 16, and a water sealing member 18 held between the cover plate 16 and the back pressure loading member 17. The water sealing member 18 is radially expandable more than the inner diameter of the opening part 12 by receiving a compression in a wall thickness direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plug device and a drainage piping member including the plug device.

Some piping members such as collecting pipes used in drainage pipe systems are provided with an inspection port in order to inspect and clean the inside of the pipe. In this type of piping member, when the inspection port is not used, it is necessary to close the inspection port to prevent water leakage.
Conventionally, as a structure for closing the inspection port, a female screw is engraved on the inner peripheral surface of the inspection port and a blind plug having a male screw that can be screwed to the internal screw is screwed into the inspection port (Patent Document 1). Etc.), and a screw plate with a screw hole corresponding to the screw hole is provided on the cover plate that can close the inspection port, and the inspection plate is covered with the cover plate. There is known a structure in which a screw is fastened from a screw hole to a screw hole (see Patent Document 2, etc.).

In addition, there is a hanging wall-like stopper in the pipe of the piping member, and a lid that can be engaged with or removed from the stopper by turning is provided on the lid that can close the inspection port. There has also been proposed a structure that can be rotated from the outside of the lid (see Patent Document 3).
JP 2002-188192 A No. 7-35193 JP 2002-54784 A

In the structure in which the blind plug is screw-fitted into the inspection port (see Patent Document 1, etc.), it is expensive to process a female screw on the inner peripheral surface of the inspection port or a male screw on the blind plug. In addition, it was easy to crush the screw threads due to corrosion and mishandling. In a structure in which the inspection port is covered with a cover plate and screwed with a plurality of screws (see Patent Document 2, etc.), the process of providing screw holes in the peripheral portion of the inspection port is expensive. In addition, accidents such as loss of screws and screw crushing of screw holes were likely to occur during repeated opening and closing of the cover plate.
In the structure (refer to Patent Document 3) in which a lid that can be rotated is provided on the cover plate and engaged with the stopper in the piping member (see Patent Document 3), a complicated dedicated structure in which the stopper is provided on the piping member itself is required. However, there was a problem that it lacked versatility and was also expensive.

Further, in each of these conventionally known various structures, the inspection port is only for inspection, and for example, it is impossible or possible to connect other pipes using this inspection port. Even in such a case, the connection structure may be limited to a special one (screw fitting or the like).
This invention is made | formed in view of the said situation, Comprising: It aims at providing the plug apparatus and drainage piping member which enabled cost reduction, easy handling, expansion of versatility, etc.

In order to achieve the above object, the present invention has taken the following measures.
That is, the stopper device according to the present invention is formed with a lid plate that contacts the opening end of the opening formed with a predetermined depth so that the opening can be closed, and a size that fits in the opening. A back pressure load member which is held in a superposed manner on the back side of the lid plate, and the back pressure load member is operated by operating the operation portion in a state where the operation portion is exposed to the front side through the lid plate. A stopper member that allows the lid plate to be moved toward and away from the lid plate, and a water stop member that is sandwiched between the lid plate and the back pressure load member so that the entire circumferential surface is exposed around the back pressure load member. The water stop member is formed of an elastic material that can be expanded beyond the inner diameter of the opening by receiving compression in the thickness direction.

  In the plug device having such a configuration, the back pressure load member and the water stop member are fitted into the opening, the cover plate is pressed against the opening end of the opening, and the operation portion of the stopper means is operated. Then, the back pressure load member comes close to the cover plate, and the clamping pressure with respect to the water stop member increases, and the water stop member is compressed in the thickness direction. Therefore, the diameter of the water stop member is increased, and the entire outer periphery of the water stop member is pressed against the inner peripheral surface of the opening, thereby causing a water stop effect. In addition, if the operation part of the stopper means is operated in the opposite direction to the above, the compression in the thickness direction of the water stop member can be released and the expanded diameter can be restored. Can be withdrawn, so that the plug device can be removed from the opening.

As described above, the stopper device has a structure in which the water stop member is simply sandwiched between the lid plate and the back pressure load member, has a small number of parts, and each part has a simple shape, which can be said to have a simple structure. In addition, the operation for mounting and removing the opening is extremely simple. There is also an advantage that no special structure is required for the opening.
Note that the lid does not necessarily have to be sized to contact the opening end of the opening, but may be sized to fit into the opening. If it does in this way, about a lid and a back pressure load member, parts can be made common and it leads to a cost reduction.

The water-stop member is formed in a ring shape, and the outer peripheral portions of the lid plate and the back pressure load member are radially outward while holding the ring inner peripheral surface of the water-stop member in a V-groove together. It is preferable to form an inclined surface that can be spread out.
If it does in this way, there exists an advantage that the material cost can be reduced in a water stop member. In addition, the closer the back pressure load member is to the lid plate, the higher the action of pushing the water stop member radially outward, so the water stop member can be quickly and efficiently coupled with the compression action in the thickness direction. The diameter can be increased.

Note that it is preferable to apply a lubricant between the water stop member and the cover plate and between the water stop member and the back pressure load member.
It is preferable that the stopper means is configured such that the outer peripheral surface of the water-stopping member can be brought into watertight contact with the inner peripheral surface of the opening before the back pressure load member reaches the cover plate.
By doing in this way, it can maintain in the state which left the surplus power for diameter enlargement of a water stop member, and can improve a water stop effect | action.
The stopper means may have a screw shaft protruding from the back pressure load member through the cover plate and a nut member screwed to the screw shaft passing through the cover plate. Such a structure is simple and is useful for cost reduction.

On the other hand, the pipe member for drainage according to the present invention is a pipe provided with at least two pipe connecting parts used for the inlet and outlet of the drainage flow, and provided with an opening penetrating the pipe wall between these pipe connecting parts. A main body and a plug device that is detachably provided so as to close the opening with respect to the tube main body, and the tube main body surrounds the opening periphery of the opening. A mouth frame for forming a predetermined depth is provided, and the stopper device of the present invention is adopted, and is attached to the opening through the mouth frame.
By providing the mouth frame around the opening as the tube main body in this way, a predetermined depth can be provided in the opening, and a mounting space for the stopper device can be secured here. If the stopper device is detachable, even if the stopper means (screw shaft, nut member, etc.) or the like is damaged on the stopper device side, it is only necessary to replace the stopper device itself. That is, unlike a conventional piping member in which a female screw is engraved on the inner peripheral surface of the inspection port (see Patent Document 1 and the like) and a piping member in which a screw hole is provided in the opening peripheral portion of the inspection port (see Patent Document 2 and the like) There is no need for replacement or repair as a pipe body, and there is an advantage that maintenance is extremely easy and can be performed at low cost.

The opening provided in the tube body may be formed with a smooth inner surface. That is, the trouble of engraving the female screw one by one is unnecessary. It is beneficial for cost reduction.
It is preferable that the mouth frame of the tube main body is formed to have a protruding length that allows other pipe materials to be connected without interfering with the tube wall of the tube main body. In this way, the opening can be used not only as an inspection port but also for connection with other pipe materials (essentially, a fluid circulation hole) as necessary.

It is preferable to provide a protrusion on the inner peripheral surface near the opening end of the mouth frame to prevent the water stop member from coming off in the stopper device.
It is preferable to provide anti-rotation means for engaging with each other between the mouth frame of the tube main body and the lid plate of the stopper device.
By employing such a detent means, there is an advantage that the operation portion of the water stop means provided in the stopper device can be easily and reliably operated. Further, since the plug device can be reliably positioned with respect to the tube main body (opening), it is easy to mount the plug device, and a water-stopping action can be obtained with certainty.

  In the plug device and drain piping member according to the present invention, the cost can be reduced, the handling becomes easy, and the versatility can be expanded.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 7 show a first embodiment of a plug device and a drainage piping member 1 according to the present invention. This piping member 1 has a pipe body 2 and a stopper device 3. As apparent from FIGS. 2, 3, and 6, the pipe body 2 is a drainage collecting pipe for connecting the side branch pipe 6 to the standing main pipe 5, for example, and is an inlet of the drainage flow flowing through the standing main pipe 5. It has the upper pipe connection part 7 used for the purpose, and the lower pipe connection part 8 used for the outlet of the drainage flow. Moreover, it has the intermediate | middle pipe | tube connection part 10 used for the inlet_port | entrance of the waste_water | drain flow which flows in from the side branch pipe 6. FIG. In the pipe body 2 in the first embodiment, only one (one) of the intermediate pipe connection portions 10 is shown.

In the pipe body 2, a portion that protrudes in a short cylindrical shape from a pipe wall that is opposite to the intermediate pipe connection part 10 is provided between the upper and lower pipe connection parts 7 and 8. As shown in FIGS. 1 and 5, the projecting portion is formed hollow inside, and the hollow interior is provided as an opening 12 that penetrates the tube wall of the tube body 2, and the outer periphery of the projecting portion. A wall is provided as a mouth frame 13 surrounding the opening periphery of the opening 12. The opening end 13a of the mouth frame 13 is formed in an annular shape.
The opening 12 is formed as having a predetermined depth on the inner peripheral surface 12a by providing the mouth frame 13. The inner peripheral surface 12a of the opening 12 is formed as a smooth surface, and any internal thread or anything that is unnecessary other than for the purpose of flowing a drainage flow (such as a hanging wall) is provided. It is not done.

The inner diameter of the opening 12 and the inner diameter of the mouth frame 13 are formed to a predetermined opening diameter (for example, 75 mm) so as to be suitable for inspecting and cleaning the inside of the tube body 2.
It should be noted that the length by which the mouth frame 13 protrudes from the tube wall of the tube body 2 is a dimension that allows connection with other tube materials in a state where there is no interference with the tube wall (about 20 mm even at the portion closest to the tube wall). ), The opening 12 and the mouth frame 13 are connected to other pipe materials (in short, fluid circulation holes) in combination with the inner diameter of the opening 12 and the mouth frame 13 being formed to a predetermined opening diameter. Will be available to you. In order to enable connection with a mechanical pipe joint, the length of the mouth frame 13 protruding from the pipe wall of the pipe body 2 may be further increased (for example, about 50 mm).

  When the opening 12 is used for connection with other pipe materials, the relative relationship with the inner and outer diameters of the pipe material to be connected is taken into consideration, including the connection method. For example, in a connection method in which the mouth frame 13 and the connection target pipe material are abutted and these are wound together with a band or the like, the outer diameter of the mouth frame 13 and the outer diameter of the connection target pipe material are matched. Further, in the connection method in which the mouth frame 13 is the connection target tube material at the opening, the outer diameter of the mouth frame 13 is adjusted to the inner diameter of the connection target tube material (pipe joint portion), and conversely, the connection target pipe material is connected to the mouth frame 13 at the reception port. In the connection method using the insertion port, the inner diameter of the mouth frame 13 is adjusted to the outer diameter of the connection target pipe material. In the present embodiment, the outer diameter of the mouth frame 13 is 89 mm.

The stopper device 3 is detachable from the tube body 2 so as to close the opening 12 thereof. As apparent from FIGS. 1 and 4, the stopper device 3 includes a cover plate 16 and a back pressure load member 17 that is held in a superposed manner on the back plate 16. The water stop member 18 is sandwiched. Further, a stopper means 19 is provided between the lid plate 16 and the back pressure load member 17.
Both the cover plate 16 and the back pressure load member 17 are formed in a disc shape. The cover plate 16 is formed larger in diameter than the back pressure load member 17. The lid plate 16 has substantially the same diameter as the outer diameter of the opening end 13a with respect to the mouth frame 13 of the opening 12 provided in the tube main body 2, and the opening can be brought into contact with the opening end 13a. 12 can be closed. The back pressure load member 17 is formed in a size that fits into the opening 12.

Both the cover plate 16 and the back pressure load member 17 are made of sheet metal (stainless steel plate or the like), and the plate surface strength is increased by pressing the plate surface center into a mortar shape. It is also possible to use a molded product made of resin or the like. The cover plate 16 is formed with a flat flange 16a on the outer peripheral side of the concave portion of the mortar shape, so that the flange 16a can come into contact with the opening end 13a. Yes.
The lid plate 16 and the back pressure load member 17 are superposed such that the portions that are recessed in a mortar shape are back to back. Thus, the inclined surface 16b formed on the outer peripheral portion of the cover plate 16 and the inclined surface 17b formed on the outer peripheral portion of the back pressure load member 17 face each other to form a V-groove-shaped peripheral groove. It has become.

A screw hole 20 having a circular opening is formed at the center of the cover plate 16, and a rotation stopper 21 having a square opening is formed at the center of the back pressure load member 17. These screw through holes 20 and rotation stopper holes 21 are used as holes for mounting the stopper means 19.
The stopper means 19 is for moving the back pressure load member 17 to and away from the lid body 16 and has an operation portion 25 exposed on the front side of the lid plate 16. In the first embodiment, a screw shaft 26 and a nut member 27 are shown.
The screw shaft 26 has a male screw end portion 26c protruding from a screw head 26a via an angular shaft 26b for preventing rotation. The male screw end portion 26c is prevented from rotating from the inside of the mortar shape of the back pressure load member 17. It is provided by being inserted into the hole 21.

In order to maintain the water-stopping property of the stopper device main body, an elastic body water-stopping means 28 sandwiched between the screw head 26a and the cover plate 16 is provided. That is, the water stop means 28 is fitted around the square shaft 26b, and the waterproofness between the rotation stop hole 21 and the screw head 26a is enhanced. The water stop means 28 may be made of an elastic material such as rubber or resin, or any other suitable material that can prevent water leakage. The screw shaft 26 passes through the screw through hole 20 of the cover plate 16 and protrudes to the inside of the mortar shape of the cover body 16.
By providing the elastic water stop means 28 sandwiched between the screw head 26 a and the cover plate 16, the back pressure load member 17 brings the operation portion 25 of the water stop means 28 close to the cover plate 16. When operated in the direction, the water stop means 28 comes into close contact with the back pressure load member 17 and can also have the water stop function of the stopper device body.

  The nut member 27 is screwed into the male screw end portion 26 c of the screw shaft 26 that penetrates the cover plate 16. In short, the operation of loosening or tightening the nut member 27 with respect to the male screw end portion 26c of the screw shaft 26 enables the back-pressure load member 17 to be brought into and out of contact with the lid body 16, thereby the operation portion. 25 is formed. In the illustrated example, a wing nut is used as the nut member 27. Therefore, it is possible to operate by hand without using a special tool. In addition, it is of course possible to use a disk-shaped nut having a knurled outer peripheral surface or a general-purpose hexagonal nut having high versatility as the nut member 27.

A washer 29 is fitted to the male screw end portion 26c. If the washer 29 is made of a material having improved slipperiness, such as nylon, not only can the rotation when the nut member 27 is tightened to the lid body 16 be smooth, but also when the nut member 27 is loosened. There is an advantage that the nut member 27 can be prevented from colliding with or rubbing against the lid body 16 due to rattling. The washer 29 can be made of metal such as hard resin or stainless steel.
The water stop member 18 is sandwiched between the cover plate 16 and the back pressure load member 17 as described above. In the first embodiment, the outer periphery of the cover plate 16 is formed in a ring shape. It is shown that it is fitted into a V-groove-shaped circumferential groove formed between the portion inclined surface 16 b and the outer peripheral portion inclined surface 17 b of the back pressure load member 17. Therefore, the cross-sectional shape on the inner peripheral surface side of the water stop member 18 also has an inclined surface that can be brought into surface contact along the outer peripheral inclined surface 16 b of the cover plate 16 and the outer peripheral inclined surface 17 b of the back pressure load member 17. It is formed as a thing.

The water stop member 18 is formed of an elastic material such as rubber or resin. Therefore, when the back pressure load member 17 is brought close to the cover plate 16 and the thickness direction of the water stop member 18 is compressed, the water stop member 18 expands inward and outward in the radial direction. The expansion in the radial direction of the water stop member 18 at this time is such that the inner peripheral surface of the water stop member 18 is in surface contact with the outer peripheral inclined surface 16b of the cover plate 16 and the outer peripheral inclined surface 17b of the back pressure load member 17. Therefore, it is directed in the direction of expanding outward in the radial direction, that is, in the diameter expansion direction.
Since the inner peripheral surface of the water stop member 18 comes to be pressed strongly in a state of surface contact with the outer peripheral inclined surface 16b of the cover plate 16 and the outer peripheral inclined surface 17b of the back pressure load member 17 as described above, Between these surface contacts, it is preferable to apply a lubricant such as silicon grease for the purpose of enhancing the lubricity during pressing and expanding the diameter of the water stop member 18 evenly in the circumferential direction. Is preferred.

The water-stop member 18 is such that the entire circumferential surface is exposed around the back pressure load member 17 in the state before the diameter expansion. And the dimension, hardness, etc. are set so that it may become more than the internal diameter (inner diameter of the opening frame 13) with respect to the opening part 12 of the pipe | tube main body 2 by diameter expansion.
In addition, before the back pressure load member 17 reaches | attains the cover plate 16, as the whole stopper | stop means 19, including the relationship with the dimension and hardness of this water stop member 18, the outer peripheral surface of the water stop member 18 is the opening part 12's. It is designed to make watertight contact with the inner peripheral surface. That is, even in this watertight contact state, a gap remains between the cover plate 16 and the back pressure load member 17. Therefore, even if the stopper means 19 is operated to the full, the water-stopping member 18 still remains in the state of increasing its diameter, and the water-stopping action is enhanced accordingly.

Here, as shown in FIG. 8, the tube body 2 is preferably provided with a protrusion 13 b on the inner peripheral surface near the opening end of the mouth frame 13. The protrusion 13b may be formed in an annular shape that is continuous along the circumferential direction of the inner peripheral surface of the mouth frame 13, or may be provided with a notch in a part of the circumferential direction, or a plurality of locations in the circumferential direction. It may be provided in a uniform or dotted manner. By providing such a projection 13b, it is possible to prevent the water stop member 18 from coming off in the plug device 3.
Note that the protrusion height of the protrusion 13b may be about 1 mm. If it is smaller than this, the effect of preventing the water stop member 18 from coming out is poor. On the other hand, if the protruding height is too large, the water stop member 18 is in the state before the diameter expansion when the stopper device 3 is attached or detached. Even if it exists, it may interfere with the protrusion 13b and may become difficult to put in and out.

  By the way, an anti-rotation means 30 is provided between the mouth frame 13 of the tube main body 2 and the lid plate 16 of the plug device 3. This anti-rotation means 30 is provided with a concave portion 31 on one of the mouth frame 13 or the cover plate 16 and a convex portion 32 on the other, and the concave portion 31 and the convex portion 32 are engaged with each other. The plate 16 is prevented from being rotated by the operation of the operation portion 25 of the stopper means 19. In the first embodiment, two sets of convex portions 32 are provided at opposite positions on the circumference of the opening end 13 a with respect to the mouth frame 13 of the tube body 2, and with respect to the cover plate 16 of the plug device 3, A pair of concave portions 31 is provided at opposite positions on the circumference of the flange portion 16a.

In the piping member 1 having such a pipe body 2 and the stopper device 3, the back pressure load member 17 and the water stop member 18 are fitted into the opening 12 (mouth frame 13). The flange 16a of the cover plate 16 is pressed against the 12 open ends 13a.
Then, the operation unit 25 of the stopper means 19 is operated. Specifically, the nut member 27 is rotated in the tightening direction. Then, the back pressure load member 17 comes close to the cover plate 16 and the clamping pressure with respect to the water stop member 18 is increased. In response to this, the water stop member 18 is compressed in the thickness direction, and as a result, the diameter of the water stop member 18 is increased, and the entire outer peripheral surface of the water stop member 18 is pressed against the inner peripheral surface 12 a of the opening 12. Therefore, a water stop action occurs, and the opening 12 is closed.

After such a plug device 3 is attached to the pipe body 2, that is, after the pipe member 1 is formed, the drainage flowing down in the standing main pipe 5 is discharged from the upper inlet pipe connection portion 7 into the lower portion. To the outlet pipe connecting portion 8 of the pipe, and the waste water flowing in from the lateral branch pipe 6 is passed from the intermediate inlet pipe connecting portion 10 to the lower outlet connecting pipe 8 so as to be in a daily use state. .
When trouble occurs regularly or in the piping member 1, the operation unit 25 of the stopper means 19 is operated in the reverse direction in the stopper device 3. That is, the nut member 27 is rotated in the loosening direction. Then, the back pressure load member 17 comes away from the cover plate 16, and the clamping pressure with respect to the water stop member 18 is weakened or released. In response to this, the compression in the thickness direction is released from the water stop member 18, and as a result, the expanded diameter state is restored, and the outer peripheral surface of the water stop member 18 is separated from the inner peripheral surface 12 a of the opening 12.

Therefore, the water stop member 18 and the back pressure load member 17 can be pulled out from the opening 12, and as a result, the stopper device 3 can be removed from the opening 12. In this way, the inside of the tube main body 2 may be inspected or cleaned from the opening 12.
In the pipe body 2, since the protruding length of the mouth frame 13 is formed so as to be connectable to other pipe materials, a joint 40 is appropriately attached to the opening 12 (mouth frame 13) as shown in FIG. It is also possible to use the pipe material 41 by connecting it.
By the way, the present invention is not limited to the above-described embodiment, and can be appropriately changed according to the embodiment.

For example, the form of the tube body 2 is not limited, and the intermediate tube connection portion 10 has three sides (three) as in the second embodiment shown in FIGS. 9 and 10, or the shape shown in FIGS. 11 and 12. The thing without the intermediate | middle pipe | tube connection part 10 like 3 embodiment may be used. Of course, the material of the tube body 2 may be resin or metal.
In the stopper device 3, the water stop member 18 is not limited to the ring shape, and may be a disk shape. The detailed structure of the stopper means 19 (such as the operation unit 25) can be changed as appropriate.
As shown in FIG. 13, the lid body 16 does not necessarily have to be sized so as to be in contact with the opening end 13 a of the opening 12, but may be sized to fit into the opening 12. If it does in this way, about the cover body 16 and the back pressure load member 17, a part can be made shared and it leads to a cost reduction. The lid body 16 and the back pressure load member 17 may not be mortar-shaped but may be flat.

It is an AA line expanded sectional view of FIG. FIG. 4 is a plan view corresponding to FIG. 3. It is the front view which showed 1st Embodiment of the piping member which concerns on this invention. It is an enlarged front view of the stopper device. It is the perspective view which expanded and showed the opening part (mouth frame) of the pipe | tube main body. It is the front view which showed the use condition in the piping member of 1st Embodiment. It is the front view which showed the condition which removed the stopper apparatus in the piping member of 1st Embodiment, and was made into another usage condition. It is the figure which expanded and showed a part (part near the opening edge of a mouth frame) of FIG. It is a top view corresponding to FIG. It is the front view which showed 2nd Embodiment of the piping member which concerns on this invention. It is the front view which showed 3rd Embodiment of the piping member which concerns on this invention. FIG. 12 is a side view corresponding to FIG. 11. It is the sectional side view which showed another embodiment of the stopper apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piping member 2 Pipe main body 3 Plug apparatus 7 Pipe connection part 8 Pipe connection part 12 Opening part 12a Inner peripheral surface 13 Mouth frame 13a Open end 13b Protrusion 16 Cover plate 16b Inclined surface 17 Back pressure load member 17b Inclined surface 18 Water stop member 19 Stopping means 25 Operation part 26 Screw shaft 27 Nut member 30 Non-rotating means 41 Other pipe materials

Claims (11)

  A cover plate (16) that abuts the opening end (13a) of the opening (12) formed with a predetermined depth so that it can be closed, and a size that fits in the opening (12). The back pressure load member (17) formed in the back and held in a superposed manner on the back side of the lid plate (16), and the operation portion (25) are exposed to the front side through the lid plate (16). The stopper (19) that enables the back pressure load member (17) to be brought into and out of contact with the cover plate (16) by the operation of the operation portion (25) in the state of being operated, the cover plate (16) and the back pressure A water stop member (18) having the entire circumferential surface exposed around the back pressure load member (17) while being sandwiched between the load member (17) and the water stop member (18). It is formed of an elastic material that can be expanded beyond the inner diameter of the opening (12) by receiving compression in the thickness direction. Apparatus.   A lid plate (16) formed to fit in the opening (12) with respect to the opening (12) formed with a predetermined depth, and the back side of the lid plate (16). The back pressure load member (17) held in a superposed state and the back pressure by operating the operating portion (25) in a state where the operating portion (25) is exposed to the front side through the cover plate (16). Stopper means (19) that enables the load member (17) to move toward and away from the lid plate (16), and the entire circumference in a state of being sandwiched between the lid plate (16) and the back pressure load member (17) A water stop member (18) whose surface is exposed around the back pressure load member (17), and the water stop member (18) is compressed in the thickness direction so that the inner diameter of the opening (12) is obtained. A plug device characterized in that it is made of an elastic material capable of expanding the diameter.   The water stop member (18) is formed in a ring shape, and the outer peripheral portions of the lid plate (16) and the back pressure load member (17) are jointly connected to each other on the inner periphery of the ring of the water stop member (18). The stopper device according to claim 1 or 2, wherein inclined surfaces (16b, 17b) are formed to allow the surface to be expanded radially outward while being sandwiched by V-grooves.   The lubricant is applied between the water stop member (18) and the cover plate (16) and the back pressure load member (17) in contact with each other. The stopper device as described.   The stopper means (19) is configured such that the outer peripheral surface of the water stop member (18) is in watertight contact with the inner peripheral surface of the opening (12) before the back pressure load member (17) reaches the cover plate (16). The stopper device according to any one of claims 1 to 4, wherein the stopper device is made possible.   The stopper means (19) includes a screw shaft (26) protruding from the back pressure load member (17) through the cover plate (16) and a screw shaft (26) passing through the cover plate (16). 6. The plug device according to claim 1, further comprising a nut member (27) screwed into the nut.   At least two pipe connections (7, 8) used for the inlet and outlet of the drainage flow were provided, and an opening (12) penetrating the pipe wall was provided between these pipe connections (7, 8). A pipe body (2), and a plug device (3) that is detachably provided to close the opening (12) with respect to the pipe body (2). The pipe body (2) has an opening. A mouth frame (13) surrounding the opening peripheral portion of the portion (12) and forming a predetermined depth in the opening (12) is provided, and the plug device (3) is defined in claims 1 to 6. A drainage piping member according to any one of the above, wherein the drainage piping member is attached to the opening (12) through the mouth frame (13).   The drain pipe member according to claim 7, wherein the opening (12) provided in the pipe body (2) has a smooth inner surface (12a).   The mouth frame (13) of the pipe main body (2) is formed to have a protruding length that can connect another pipe material (41) without interfering with the pipe wall of the pipe main body (2). The drainage piping member according to claim 7 or 8.   A protrusion (13b) is provided on the inner peripheral surface near the opening end of the mouth frame (13) to prevent the water stop member (18) from coming off in the stopper device (3). The drainage piping member according to any one of Items 7 to 9.   Antirotation means (30) for engaging with each other is provided between the mouth frame (13) of the tube body (2) and the lid plate (16) of the stopper device (3). The drainage piping member according to any one of claims 7 to 10.

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