JP2014001515A - Cut-off plug for drainpipe, and connection container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cut-off plug for a drainpipe and the like, capable of facilitating butt work of a tube tip in a manhole or eliminating the butt work of the tube tip in the manhole.SOLUTION: A cut-off plug 1 for a drainpipe comprises: a lid 4 for closing the drainpipe 2 connected to a manhole 7; and a communication hole 10 provided in the lid 4 and communicating the inside of the drainpipe 2 closed by the lid 4 with the inside of the manhole 7. One pipe tip 12a of two pipe tips 12 of a pipe 11 used in the manhole 7 is inserted into the communication hole 10, and an inner peripheral edge 13 of the communication hole 10 is made of rubber and seals the inside of the drainpipe 2 to the inside of the manhole 7 by closely contacting the outer peripheral surface of one pipe tip 12a. Thereby, the other pipe tip 12b projecting into the manhole 7 can freely swing with one pipe tip 12a inserted into the communication hole 10 as a fulcrum. Thus, the butt work of the tube tip 12b in the manhole 7 can be facilitated.

Description

  The present invention mainly relates to a water stop plug for a sewer pipe.

Conventionally, in construction work where workers enter the manhole, such as seismic construction of manholes, in order to prevent the inflow of sewage into the manhole, the opening of the sewer pipe to the manhole is sewer pipe It is closed with a water stop plug (hereinafter sometimes abbreviated as a plug).
By the way, the sewer pipe connected to the manhole has an upstream sewer pipe for mainly allowing the sewage to flow into the manhole and a downstream sewer pipe for mainly causing the sewage to flow out from the manhole. In particular, it is necessary to flow sewage from the upstream sewage pipe to the downstream sewage pipe.

For this reason, the plug is provided with a pipe portion that communicates the inner periphery of the closed sewage pipe and the human hole, and the pipe portion is provided such that the pipe tip protrudes toward the human hole side. Then, the pipe ends of the plugs that close the upstream and downstream sewage pipes are aligned, the pipe ends are butted together, and connected by a joint, so that the sewage flows from the upstream sewage pipe to the downstream sewage pipe. (For example, refer to Patent Document 1).
However, the work of abutting the pipe tips in the human hole is extremely complicated and a heavy burden on the worker.

JP 2005-180569 A

  An object of the present invention is to facilitate a pipe tip butting operation in a human hole or to omit a pipe tip butting operation in a human hole.

(Means of Claim 1)
According to the means of claim 1, the water stop plug for the sewage pipe includes a lid that closes the sewage pipe connected to the human hole, and a communication that is provided on the lid and communicates between the inside of the sewage pipe closed by the lid and the inside of the human hole. With holes. In addition, one of the two pipe tips of the pipe used in the human hole is inserted into the communication hole, and the inner peripheral edge of the communication hole is made of rubber, and the outer circumference of the one pipe tip By closely contacting the surface, the inside of the sewer pipe is sealed against the inside of the human hole.

As a result, the other pipe tip protruding into the human hole can swing freely with one pipe tip inserted into the communication hole as a fulcrum.
For this reason, the work of butting the pipe tips in the human hole can be facilitated.

(Means of Claim 2)
According to the means of claim 2, the connection container is used in a human hole to which a plurality of sewer pipes are connected, and each of the plurality of sewer pipes is used in a state of being closed by a water stop plug. In addition, a water stop plug that closes each of at least two of the plurality of sewer pipes is provided with a pipe that communicates the inside of the sewer pipe with the inside of the manhole. Are provided so as to project and open. In addition, the connection container individually has an insertion port into which each pipe tip is inserted, and each insertion port is provided so as to communicate with the internal space of the container and the inside of the human hole. The inner peripheral edge is made of rubber and seals the inner space against the inside of the human hole by being in close contact with the outer peripheral surface of each pipe tip.

As a result, by inserting the respective pipe tips into the respective insertion ports of the connection container, the sewage is leaked from the upstream sewage pipe to the downstream sewage pipe without making the axes of the pipe ends substantially coincide with each other. It can flow without.
For this reason, the work of butting the pipe tips in the human hole can be omitted.

(A) Longitudinal sectional view before deformation of the pressing portion of the water drain plug for the sewer pipe, (b) Front view before deformation of the pressing portion of the water plug for the sewer pipe, (c) Deformation of the pressing portion of the water plug for the sewer pipe (Example 1) which is the previous abutment enlarged view. (A) Longitudinal sectional view after deformation of the pressing part of the water drain plug for the sewer pipe, (b) Front view after deformation of the pressing part of the water plug for the sewer pipe, (c) Deformation of the pressing part of the water plug for the sewer pipe (Example 1) which is a subsequent abutment enlarged view. It is a longitudinal cross-sectional view of the water stop plug for sewage pipes before pipe insertion (Example 1). It is a longitudinal cross-sectional view of the water stop plug for sewer pipes after pipe insertion (Example 1). (Example 1) which is the state figure by which the pipe tip was connected within the human hole. (Example 2) which is a use condition figure of the connection container in a human hole. (A) The longitudinal cross-sectional view of a connection container, (b) It is a front view (Example 2). It is a cross-sectional view of the human hole in which the connection container is used (modified example).

  The water stop plug for a sewage pipe according to the first embodiment includes a lid that closes a sewage pipe connected to the human hole, and a communication hole that is provided on the lid and communicates the inside of the sewage pipe closed by the lid with the inside of the human hole. The communication hole has a rubber inner peripheral edge into which one of the two pipe tips of the pipe used in the human hole is inserted and is in close contact with the outer peripheral surface of the pipe tip.

  The connection container of the second embodiment is used in a human hole to which a plurality of sewer pipes are connected, and each of the plurality of sewer pipes is used in a state of being closed by a water stop plug. In addition, a water stop plug that closes each of at least two of the plurality of sewer pipes is provided with a pipe that communicates the inside of the sewer pipe with the inside of the manhole. Are provided so as to project and open. In addition, the connection container individually has an insertion port into which each pipe tip is inserted, and each insertion port is provided so as to communicate with the internal space of the container and the inside of the human hole. It has a rubber inner periphery that is in close contact with the outer peripheral surface.

[Configuration of Example 1]
The water stop plug for the sewage pipe of Example 1 is demonstrated based on FIGS.
The water stop plug for the sewage pipe (hereinafter referred to as the plug 1) is a seal that seals between the lid 4 that closes the inside of the sewage pipe 2, and the peripheral edge 4 a of the lid 4 and the inner peripheral surface 5 of the sewage pipe 2. Means 6. Then, the plug 1 closes the opening of the sewage pipe 2 to the manhole 7 and closes the manhole 7 in a construction in which an operator enters the manhole 7 and works like the earthquake resistance construction of the manhole 7. Used to prevent the inflow of sewage.

By the way, the sewage pipe 2 connected to the human hole 7 includes an upstream sewage pipe 2α for mainly allowing the sewage to flow into the human hole 7 and a downstream sewage pipe 2β for mainly causing the sewage to flow out from the human hole 7. Even during construction, it is necessary to flow sewage from the upstream sewage pipe 2α to the downstream sewage pipe 2β.
Therefore, the lid 4 has the following configuration in order to flow sewage from the upstream sewage pipe 2α to the downstream sewage pipe 2β while preventing the inflow of sewage into the human hole 7.

  The lid 4 includes a communication hole 10 that allows communication between the closed sewer pipe 2 and the human hole 7. In addition, one of the two pipe tips 12 of the pipe 11 used in the human hole 7 is inserted into the communication hole 10. The inner peripheral edge 13 of the communication hole 10 is made of rubber so that it can be brought into close contact with the outer peripheral surface of the inserted pipe tip 12a.

  That is, the lid 4 includes a lid main body 4c which is a metal annular plate having a circular hole 4d opened at the center, a rubber annular plate 15 having a circular hole 15d opened at the center, and a rubber annular plate 15 similarly. The hole 15d has a smaller diameter than the hole 4d. Here, the rubber annular plate 15 is fixed to the lid body 4c so that the center of the hole 15d and the center of the hole 4d substantially coincide. The hole 15d in a state where the rubber annular plate 15 is fixed to the lid body 4c becomes the communication hole 10.

Thereby, as shown in FIGS. 3 and 4, the inner peripheral edge 13 is displaced to the back side by inserting the pipe tip 12 a into the communication hole 10 from the near side of the sewer pipe 2 toward the back side. In close contact with the outer peripheral surface of the tube tip 12a.
In addition, it is desirable to apply | coat the lubricant for reducing the frictional resistance between the inner periphery 13 and the pipe tip 12a which generate | occur | produce at the time of insertion to the outer peripheral surface of the pipe tip 12a.

  The fixture 16 includes, for example, a bolt 16a, a nut 16b, and an annular pressing plate 16c. The pressing plate 16c is disposed on the surface of the rubber annular plate 15 so that the center thereof is substantially coincident with the rubber annular plate 15 and the lid body 4d. Further, for example, eight bolts 16a and nuts 16b are arranged at intervals of 45 degrees in the circumferential direction, and all the shaft portions of the bolts 16a pass through the holding plate 16c and the lid body 4c. The rubber annular plate 15 can be fixed to the lid body 4c by screwing the screw 16 to the shaft portion of the bolt 16a. Further, by disposing the presser plate 16c between the nut 16b and the rubber annular plate 15, the screw fastening force is dispersed and made uniform in the circumferential direction.

The tube 11 has a flange 17 at the tip of the other tube tip 12b. Then, for example, as shown in FIG. 5, the pipe 11 is inserted into the communication hole 10 of the plug 1 that closes the upstream and downstream sewage pipes 2α and 2β, and the axes of the pipe tips 12b are aligned. Further, the flanges 17 of the respective pipe tips 12b are brought into contact with each other and screwed together.
Thereby, the sewage can flow from the upstream sewage pipe 2α to the downstream sewage pipe 2β while preventing the sewage from flowing into the human hole 7.

The sealing means 6 includes a rubber cylindrical portion 18, a screw holding portion 19, and a pressing portion 20 described below.
The rubber tubular portion 18 is in close contact with the inner peripheral surface 5 of the sewer pipe 2 and has an inner diameter that is substantially equal to the diameter of the lid 4. The rubber cylindrical portion 18 is fastened to one end in the axial direction of the rubber cylindrical portion 18 and the screw holding portion 19 by a known fastening band 21, and the outer peripheral surface 19 a of the screw holding portion 19 and the rubber cylindrical portion. The 18 inner peripheral surfaces 18a are in close contact with each other. The rubber tubular portion 18 has an axial length substantially equal to the axial length of the screw holding portion 19.

  The screw holding portion 19 is an annular body that is arranged on the inner peripheral side of the rubber cylindrical portion 18 and has eight screw holes 22 that penetrate in the radial direction, for example, at intervals of 45 ° in the circumferential direction. A screw 23 that is screwed into each of 22 is held. Further, the screw holding portion 19 is one bottomed cylindrical body 24 formed integrally with the lid 4, the cylinder of the bottomed cylindrical body 24 is the screw holding portion 19, and the bottom portion of the bottomed cylindrical body 24 is the lid. 4.

The pressing portion 20 is sandwiched in the radial direction between the inner peripheral side of the rubber cylindrical portion 18 and the outer peripheral side of the screw holding portion 19, that is, between the rubber cylindrical portion 18 and the screw holding portion 19. The pressing portion 20 is disposed on the other axial side of the rubber tubular portion 18 and is deformed by being pressed to the outer peripheral side by a tip 23a of a screw 23 protruding from the screw holding portion 19 to the outer peripheral side. And the press part 20 presses the rubber-made cylindrical part 18 to an outer peripheral side by deform | transforming to an outer peripheral side, and is closely_contact | adhered to the inner peripheral surface 5 of the sewer pipe 2.
Here, the pressing portion 20 disperses the force with which the tip 23 a presses the rubber tubular portion 18 in the circumferential direction, and prevents the tip 23 a from biting into the rubber tubular portion 18.

  The pressing portion 20 is, for example, a metal annular body, and an abutment 25 is formed so that the diameter can be increased as shown in FIGS. 1 (c) and 2 (c). The joint 25 includes a convex portion 26 protruding in the circumferential direction of the pressing portion 20 and a concave portion 27 recessed in the circumferential direction, and the convex portion 26 is fitted in the concave portion 27. And the press part 20 deform | transforms into an outer peripheral side, and the convex part 26 and the recessed part 27 are spaced apart relatively to the circumferential direction, with the convex part 26 fitting to the recessed part 27. FIG. That is, the distance in the circumferential direction between the tip of the convex portion 26 and the bottom of the concave portion 27 increases with the deformation of the pressing portion 20 toward the outer peripheral side.

  2A, the plug 1 is inserted into the sewage pipe 2 so that the side with the lid 4 is located on the back side of the sewage pipe 2 with respect to the axial direction, and a screw holding portion 19 is provided on the front side. Place. By tightening the screw 23 in this state, the pressing portion 20 is pressed toward the outer peripheral side by the tip 23a of the screw 23 to expand the diameter. Thereby, the rubber-made cylindrical part 18 is pressed by the press part 20 to the outer peripheral side, closely_contact | adheres in the perimeter of the inner peripheral surface 5 of the sewer pipe 2, and seals the sewer pipe 2. FIG.

[Effect of Example 1]
According to the plug 1 of the first embodiment, since the inner peripheral edge 13 is made of rubber, the pipe tip 12b can be freely swung with the pipe tip 12a as a fulcrum while the inner peripheral edge 13 is in close contact with the pipe tip 12a. Can do.
As a result, as shown in FIG. 5, even if the axes of the pipes 11 inserted into the communication holes 10 of the plug 1 that close the upstream and downstream sewage pipes 2α and 2β do not substantially coincide with each other, The axis alignment of 12b becomes easy. For this reason, the abutting work between the flanges 17 becomes easy.

[Configuration of Example 2]
The connection container of Example 2 is demonstrated based on FIG.
In the second embodiment, the same reference numerals as those in the first embodiment are used.
The connection container 31 is used to flow sewage from the upstream sewage pipe 2α to the downstream sewage pipe 2β using the pipe 11 in a mode different from that of the first embodiment. The plug 1 used in the second embodiment has the same configuration as that of the first embodiment, and is used by inserting the pipe tip 12a into the communication hole 10 as in the first embodiment.
In addition, the pipe | tube 11 used in Example 2 is not provided with the flange 17 at the front-end | tip of the pipe tip 12b.

  The connecting container 31 connects the upstream pipe tip 12 b and the downstream pipe tip 12 b in the human hole 7, and connects the upstream pipe 11 and the downstream pipe 11. Here, the connection container 31 is formed with one insertion port 33 into which the pipe ends 12 on the upstream side and the downstream side are respectively inserted. Each insertion port 33 communicates the internal space 32 of the connection container 31 with the human hole 7. Thereby, the sewage flows into the internal space 32 from the upstream pipe 11 and flows out from the internal space 32 to the downstream pipe 11 by inserting the pipe tips 12 into the respective insertion ports 33. For this reason, it is possible to flow sewage through the connection container 31 from the upstream sewage pipe 2α to the downstream sewage pipe 2β while preventing the inflow of sewage into the human hole 7.

Hereinafter, a specific form of the connection container 31 will be described. As shown in FIG. 7, the connection container 31 mainly includes a cylindrical metal body in which both ends in the axial direction of the metal cylinder are closed by a metal annular plate 34.
Here, the annular plate 34 has a circular hole 34d opened at the center. Similarly to the lid body 4 c of the first embodiment, the rubber annular plate 15 is fixed to the annular plate 34, and the hole 15 d of the rubber annular plate 15 becomes the insertion port 33, and the inner peripheral edge 39 of the insertion port 33. Is made of rubber.

Here, an example of a method of connecting the pipe 11 and the connection container 31 on the upstream side and the downstream side will be described.
First, the plug 1 is fixed to the upstream sewage pipe 2α, and the pipe 11 is inserted into the communication hole 10. Then, the connection container 31 is moved toward the upstream pipe tip 12 b, and the upstream pipe 12 b is inserted into one insertion port 33. As a result, the upstream pipe 11 and the connection container 31 are connected.

Next, the plug 1 is fixed to the downstream sewage pipe 2β, and the pipe 11 is inserted into the communication hole 10. Then, the connection container 31 is moved toward the downstream pipe tip 12 b, and the downstream pipe 12 b is inserted into the other insertion port 33. As a result, the upstream pipe 11 and the connection container 31 are connected. At this time, the internal space 32 is sealed with respect to the human hole 7 and maintains liquid tightness.
In addition, it is desirable to apply a lubricant for reducing the frictional resistance between the inner peripheral edge 39 and the outer peripheral surface of each of the upstream and downstream pipe tips 12b.

[Effect of Example 2]
According to the connection container 31 of the second embodiment, by inserting the upstream and downstream pipe tips 12b into the respective insertion ports 33, the pipe tips 12b can be connected to each other. The side tube 11 can be connected. For this reason, it is possible to allow the sewage to flow from the upstream sewage pipe 2α to the downstream sewage pipe 2β without leaking into the human hole 7 without substantially matching the axes of the pipe tips 12b.
As a result, the work of butting the pipe tips 12b in the human hole 7 can be omitted.
Even in the operation of inserting the pipe tip 12b into the connection container 31, it is not necessary to align the axes of the connection container 31 and the pipe tip 12b.

[Modification]
Various modifications can be considered for the present invention without departing from the gist thereof.
According to the second embodiment, the tube 11 is used by being inserted into the communication hole 19 of the plug 1. However, the tube 11 and the plug 1 may be integrally formed, and the tube 11 and the plug 1 may be rigidly joined.
According to the first and second embodiments, the sealing means 6 includes the rubber cylindrical portion 18, the screw holding portion 19, and the pressing portion 20, but the aspect of the sealing means 6 is as described above. It is not limited to. For example, sealing is performed by pressing an O-ring having a hollow structure filled with a fluid in the axial direction so that the outer periphery of the O-ring is expanded and the outer periphery of the O-ring is in close contact with the inner peripheral surface 5 of the sewer pipe 2. Means may be used.
According to the second embodiment, the connection container 31 is mainly composed of a cylindrical metal body. However, the connection container 31 is not limited to such a form, and for example, a rectangular tube metal body may be used.
Further, according to the second embodiment, the connection container 31 is one in which the two pipes 11 are connected. However, the connection container 31 is not limited to such a connection mode. For example, as shown in FIG. It is good also as a structure which connects the two pipe | tubes 11. FIG.

1 Sewer pipe plug (plug)
2 Sewer pipe 4 Lid 7 Human hole 10 Communication hole 11 Pipe 12 Pipe tip 12a Pipe tip 13 Inner peripheral edge

Claims (2)

A lid that closes the sewer pipe connected to the manhole;
A communication hole provided in the lid and communicating with the inside of the sewer pipe and the inside of the human hole closed by the lid,
One of the two pipe tips of the pipe used in the human hole is inserted into the communication hole,
An inner peripheral edge of the communication hole is made of rubber, and seals the inside of the sewer pipe with respect to the inside of the human hole by being in close contact with the outer peripheral surface of the one pipe tip. Water stop plug. A container used in a human hole to which a plurality of sewer pipes are connected,
Each of the plurality of sewer pipes is used in a state of being closed by a water stop plug,
The water stop plug that closes each of at least two of the plurality of sewer pipes is provided with a pipe that communicates the inside of the sewer pipe and the inside of the human hole,
Each of the tubes is provided such that a tube tip projects and opens into the human hole,
The container individually has an insertion port into which the respective pipe tips are inserted,
Each of the insertion ports is provided so as to communicate the internal space of the container and the inside of the human hole,
The inner peripheral edge of each insertion port is made of rubber, and the inner space is sealed against the inside of the human hole by being in close contact with the outer peripheral surface of each of the pipe tips. Connection container.

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