JP2017044017A - Cleaning method of sewage pipe and communication pipe used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method of a sewage pipe and a communication pipe used therefor, capable of cleaning the sewage pipe of arranging a plurality of manholes in a midway position.SOLUTION: A cleaning method of a sewage pipe 14 of arranging a plurality of manholes 16, includes a communication-connection process of communicating-connecting an opening part connected to the sewage pipe 14 on the upstream side and the downstream side of the whole manholes 16 existing in a cleaning object section by using a communication pipe 10 in the manhole 16 and a cleaning medium introduction-discharge process of discharging from the downstream side via the sewage pipe 14 and the communication pipe 10 by pressurizing-introducing a sherbet-like cleaning medium 28 including an ice particle and cleaning water from the upstream side of the cleaning object section after the communication-connection process.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for cleaning a sewer pipe and a communication pipe used therefor, and more particularly to a method for cleaning a sewer pipe in which a plurality of manholes are arranged and a communication pipe used therefor.

  The sewer pipe is embedded at a predetermined depth position from the ground, and a plurality of manholes are arranged in the middle of the extending direction. In the sewer pipes, sewage such as rainwater, domestic wastewater, and industrial wastewater flows. Therefore, a large amount of sediment (scale) adheres to the inside of the sewer pipe, and impurities and the like are likely to remain. For this reason, it is necessary to periodically inspect and clean sewer pipes so that troubles such as clogging occur and flow capacity does not decrease.

  The manhole relays and connects the upstream sewer pipe (hereinafter abbreviated as upstream pipe) and the downstream sewer pipe (hereinafter abbreviated as downstream pipe), and periodically checks and cleans the buried sewer pipe. It is provided for the purpose. In the manhole, the upstream pipe and the downstream pipe are opened, and an invert that is a groove is formed at the bottom of the manhole to facilitate the flow of sewage from the upstream pipe to the downstream pipe (for example, Patent Document 1).

  On the other hand, an ice pig pipe cleaning method is known as a method for cleaning pipe lines such as sewer pipes (Non-Patent Document 1). This is because a cleaning medium (fluid) having ice particles and water is introduced as a cleaning medium in a pipe by pressurization to form a lump of cleaning medium in the pipe, a so-called ice pig, It is a method of moving in the pipeline. As the ice pig moves in the pipeline, deposits and the like in the pipeline are scraped off, and contaminants are taken in to clean the pipeline.

JP2013-40477A

“Ice Pig Pipe Cleaning Method”, Ice Pig Study Group (http://www.icepig.org/)

  When the above ice pig pipe cleaning method is applied to a sewer pipe, it is possible to clean the sewer pipe between one manhole and another manhole adjacent thereto, that is, one span of the sewer pipe. it can. However, the upstream pipe and the downstream pipe could not be washed at once through the manhole. That is, since the upstream pipe and the downstream pipe are not directly connected in the manhole, the sherbet-like cleaning medium having ice particles and water flowing through the upstream pipe overflows into the manhole, and the downstream pipe is washed. This is because the medium cannot be introduced accurately. Cleaning the entire sewer pipe between the manholes and the manholes has a problem that it takes a long time to work and the work cost is high.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for cleaning a sewer pipe in which a plurality of manholes are disposed in the middle position and a communication pipe used therefor. There is.

In order to achieve the above object, the method for cleaning a sewer pipe according to claim 1 is a method for cleaning a sewer pipe in which a plurality of manholes are arranged.
A communication connection step of connecting the openings connected to the sewer pipes on the upstream side and the downstream side of all the manholes existing in the cleaning target section using a communication pipe in the manhole, and after the communication connection step, A cleaning medium introduction and discharge step of pressurizing and introducing a sherbet-shaped cleaning medium containing ice particles and cleaning water from the upstream side of the section to be cleaned and discharging from the downstream side through the sewer pipe and the communication pipe, To do.

  According to this method, the upstream pipe and the downstream pipe are reliably connected to each other using the communication pipe in all manholes in the section to be cleaned. Therefore, when the sherbet-shaped cleaning medium containing ice particles and cleaning water is introduced from the upstream side after the communication connection step is pressurized, the sherbet-shaped cleaning medium including ice particles and cleaning water that has passed through the upstream pipe is It does not overflow into the manhole and is accurately introduced into the downstream pipe through the communication pipe. Therefore, it became possible to collect and clean a sewer pipe having a plurality of manholes in the middle.

  The method for cleaning a sewer pipe according to claim 2 is the method for cleaning a sewer pipe according to claim 1, wherein the cleaning medium introduction / discharge step uses an obturator at the upstream end of the section to be cleaned. The cleaning medium is pressurized and introduced through the opening provided in the obturator on the upstream side, and the cleaning medium flowing out into the manhole is sucked and discharged on the downstream side. Features.

  According to this method, the upstream side of the section to be cleaned is closed by the obturator, and a sherbet-like cleaning medium containing ice particles and cleaning water is pressurized and introduced through an opening formed in the obturator. Accordingly, it is possible to efficiently pressurize a sherbet-like cleaning medium containing ice particles and cleaning water from the upstream side into the sewer pipe. Further, on the downstream side, the cleaning medium that has flowed into the manhole is sucked and discharged, thereby facilitating the cleaning operation.

In order to achieve the above object, a communication pipe according to claim 3 is a communication pipe used in the communication connection step of the method for cleaning a sewer pipe in which a plurality of manholes according to claim 1 or 2 are arranged. ,
The upstream connection member and the downstream connection member inserted and fixed in the sewer pipe from the openings on the upstream side and the downstream side of the manhole, respectively, and the upstream and downstream connection members are connected in communication in the manhole. It has a tubular intermediate part, and urging means for urging the upstream connecting member and the downstream connecting member against the opening of the manhole so as to maintain the mounted state.

  According to this configuration, the communication pipe can be easily configured in the manhole by connecting the upstream connection member and the downstream connection member inserted and fixed to the sewer pipe at the tubular intermediate portion. In addition, since the two connecting members are urged by the urging means in the direction in which the sewer pipe extends away from each other, when the cleaning medium from the upstream pipe is introduced into the downstream pipe through the communication pipe, Prevent the disconnection of the communication pipe.

  The communication pipe according to claim 4 is the communication pipe according to claim 3, wherein the upstream side and downstream side connection members have a tubular main body portion and a radius in the middle of the main body portion than the sewer pipe. A flange formed so as to protrude outward in the direction, and the main body portion has one end portion as an insertion end portion to be inserted into the sewer pipe, and the other end portion to which the tubular intermediate portion is attached. It is an attachment end portion, and the urging means is interposed between the upstream and downstream connecting members, and has a configuration for urging both the connecting members in a direction in which they are separated in the sewer extension direction. .

  According to this configuration, the main body portions of the upstream and downstream connection members are provided with the flanges, and one end of each is inserted into the sewer pipe. In this state, the urging means urges them away from each other, so that the upstream side and downstream side connecting members are in a state where the flanges are pressed against the opening of the manhole, and are in a stable mounting state.

  The communication pipe according to claim 5 is the communication pipe according to claim 3 or 4, wherein the tubular intermediate portion is formed to be extendable and connectable to the upstream and downstream connection members in an extended state. It has a long length and is flexible. With this configuration, the tubular intermediate portion can be extended with flexibility and can be easily attached to the connection member.

  The communication pipe according to claim 6 is a communication pipe used in the communication connection step of the method for cleaning a sewer pipe relay-connected by the manhole according to claim 1 or 2, wherein the upstream length is normal. The bellows pipe or the bellows pipe is longer than the interval between the opening of the sewer pipe on the side and the downstream side, and the both ends of the bellows pipe or the bellows pipe are connected to the upstream side and the downstream side when installed in the manhole. Each side is biased toward the opening side of the sewer pipe.

  With this configuration, the communication pipe constituted by the bellows pipe or the bellows pipe, which is longer than the interval between the opening portions of the upstream pipe and the downstream pipe in a normal state, can be shrunk and carried when installed in the manhole. Furthermore, since the end portion is urged in the extending direction, it is easy to attach the communication pipe to the openings of the upstream pipe and the downstream pipe. In addition, since there is a biasing force in the extending direction, when the cleaning medium flowing from the upstream pipe flows to the downstream pipe through the communication pipe, the communication pipe is prevented from coming off, and the cleaning can be performed accurately. it can.

  According to the method for cleaning a sewer pipe of the present invention and the communication pipe used therefor, the upstream pipe and the downstream pipe are reliably connected in a manhole by a simple configuration of the communication pipe, and the sherbet-like shape contains ice particles and cleaning water. The cleaning medium is accurately introduced from the upstream pipe to the downstream pipe. Accordingly, it becomes possible to clean a sewer pipe having a plurality of manholes in the middle using a sherbet-shaped cleaning medium. That is, it is possible to collectively clean sewer pipes having a plurality of spans including a plurality of manholes in the middle of the manhole, thereby significantly reducing the work time and cost.

It is a schematic whole figure concerning the washing method of a sewer pipe of the present invention. FIG. 4 is a schematic cross-sectional view of the communication pipe after completion of the communication connection process according to the first embodiment of the communication pipe of the present invention. It is a schematic top view at the time of seeing a communication pipe from the upper part of a manhole after completion | finish of a communication connection process. It is a schematic perspective view of the connection member of the communicating pipe shown in FIG.2 and FIG.3. It is a schematic front view when the connection member of FIG. 4 is inserted in a sewer pipe. It is a schematic sectional drawing of the communicating pipe after 2nd Embodiment of the communicating pipe of this invention after completion | finish of a communicating connection process. It is explanatory drawing which shows the procedure of the attachment to the manhole of the communicating pipe shown in FIG.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic overall view illustrating a cleaning method according to an embodiment of a method for cleaning a sewer pipe of the present invention. However, the sewer pipe 14 has shown the schematic cross section vertically divided by the surface containing a central axis.

  The sewer pipe 14 is buried at a predetermined depth from the ground, and manholes 16 are installed at predetermined intervals. In FIG. 1, four manholes 16-1 to 16-4 are illustrated as an example. In the present embodiment, the cleaning target section is three spans between the manhole 16-1 and the manhole 16-4.

  In the manhole 16, the opening of the upstream sewage pipe (upstream pipe) 14-1 and the opening of the downstream sewage pipe (downstream pipe) 14-2 are exposed, and at the bottom of the manhole 16, An invert (groove portion) 36 is formed in order to smoothly flow out sewage and the like flowing from the upstream pipe 14-1 to the downstream pipe 14-2 (see also FIG. 5 described later).

  In this Embodiment, the internal diameter of the sewer pipe 14 is about 300 mm, and the embedding depth is about 1500 mm. The interval between the manholes 16 installed in the middle of the sewer pipe is about 30 m. In FIG. 1, the left side is the upstream side and the right side is the downstream side. A delivery unit wheel 18 for pressure-introducing a sherbet-like cleaning medium (fluid) containing ice particles and cleaning water into the sewer pipe 14 is disposed near the ground entrance of the first manhole 16-1 on the upstream side. . A recovery vehicle 20 that sucks and discharges the cleaning medium introduced from the upstream side is disposed near the ground entrance of the fourth manhole 16-4 on the downstream side.

In order to efficiently introduce pressure of the cleaning medium from the delivery unit wheel 18 to the sewer pipe 14, a hose 22 and a closing tool 24 are used. The obturator 24 closes the sewer pipe 14 upstream of the section to be cleaned, and the obturator 24 has an opening. Through the hose 22 into the opening, pressurized introduction of the cleaning medium is performed. Further, on the downstream side of the section to be cleaned, the collection vehicle 20 is configured to suck and discharge the cleaning medium and the like flowing out into the manhole 16-4 using the hose 22 without using the obturator.

  After the delivery unit vehicle 18 and the collection vehicle 20 are arranged, a communication connection process is executed. In the present embodiment, the communication connection process is performed in the second manhole 16-2 and the third manhole 16-3. In order to prevent the inflow of sewage from the sewer pipe 14 outside the section to be cleaned during the series of operations, or to prevent the outflow of filth generated by the cleaning outside the section to be cleaned, Although the packer 25 that closes the sewer pipe 14 is used, a drainage pump or the like may be used without using the packer 25.

  FIG. 2 is a schematic cross-sectional view of the communication pipe installed in the manhole after the communication connection process. FIG. 3 is a schematic top view of the communication pipe viewed from the upper part of the manhole. The communication pipe 10 includes an upstream side connection member 26-1 and a downstream side connection member 26-2, a tubular intermediate portion 34 that communicates and connects the connection members, and two urging means 32.

  FIG. 4 is a schematic perspective view of the upstream connection member 26-1. The upstream connection member 26-1 includes a tubular main body 27-1 having a predetermined length made of metal or high-strength resin. The outer diameter of the main body 27-1 is substantially equal to the inner diameter of the sewer pipe 14. One end of the main body 27-1 is an insertion end inserted into the sewer pipe 14, and the other end is an attachment end for attaching and fixing the tubular intermediate portion 38. Two convex portions 38-1 are formed on the mounting end portion so as to protrude outward in the radial direction. The tubular intermediate portion 34 is fixed between the two convex portions 38-1 and 38-1. Furthermore, a flange 30-1 is formed in the central portion of the upstream connection member 26-1 so as to protrude outward in the radial direction from the sewer pipe 14. The flange 30-1 is formed in a state in which not the entire outer periphery of the main body 27-1, but the lower part is cut out, and the flange 30-1 is formed to be curved along the side wall of the manhole 16-2. Yes.

  FIG. 5 is a schematic front view when one end side of the upstream connection member 26-1 is inserted into the sewer pipe 14. As described above, the flange 30-1 of the upstream connection member 26-1 is formed to be curved along the side wall of the manhole 16-2, and the lower portion is the bottom of the manhole 16-2 in which the invert 36 is formed. Cut out to fit. Therefore, when the upstream connection member 26-1 is inserted into the sewer pipe 14-1 from the upstream opening, the stability is good.

  In addition, when the lower shape of the flange 30-1 is not aligned with the bottom portion where the invert 36 of the manhole 16-2 is formed, a flat plate or the like made of the same material as the flange 30-1 is used. You may make it fill a gap.

  The downstream connection member 26-2 is the same as the upstream connection member 26-1 described above. That is, the upstream side connection member 26-1 and the downstream side connection member 26-2 have the same shape.

  In the present embodiment, the tubular intermediate portion 34 is made of a thick cloth, and can be stretched when attached and fixed to the connection member 26 and the pressure of the cleaning medium introduced therein. It has the strength to withstand. The inner diameter when the tubular intermediate portion 34 is expanded is substantially the same as the outer diameter of the upstream connection member 26-1 and the downstream connection member 26-2. The length of the tubular intermediate portion 34 is substantially the same as the interval between the flanges 30-1 and 30-2 when the upstream connection member 26-1 and the downstream connection member 26-2 are inserted into the sewer pipe 14.

  The work of the communication connection process is as follows. The upstream connection member 26-1 is inserted into the upstream pipe 14-1. The insertion is performed until the flange 30-1 of the upstream connection member 26-1 hits the opening of the upstream pipe 14-1 with the buffer member 29-1 interposed therebetween. Similarly, the downstream connection member 26-2 is inserted into the downstream pipe 14-2. The downstream connection member 26-2 may be inserted first. In the present embodiment, the buffer members 29-1 and 29-2 are made of rubber members.

  After inserting the upstream connection member 26-1 and the downstream connection member 26-2 into the sewer pipe 14, the tubular intermediate portion 34 is covered with the connection member 26. Since the tubular intermediate part 34 is made of cloth, it can be easily put on the connection member 26. The tubular intermediate portion 34 is fixed to the connecting member 26 between the convex portions 38-1 and 38-1 formed on the main body portion 27-1 of the upstream connecting member 26-1 and the downstream connecting member 26-2. The convex portions 38-2 and 38-2 formed on the main body portion 27-2 were bound by a rubber band 40.

  Thereafter, the biasing means 32 is attached between the flange 30-1 of the upstream connection member 26-1 and the flange 30-2 of the downstream connection member 26-2. The urging means 32 is configured using a spring member, and the upstream side connection member 26-1 and the downstream side connection member 26-2 are respectively attached by being contracted against the urging force. It is urged to the upstream pipe side and the downstream pipe side. The flange 30-1 of the upstream connection member 26-1 and the flange 30-2 of the downstream connection member 26-2 are respectively pressed against the opening of the manhole 16-2, and a stable mounting state is obtained. In the present embodiment, two urging units 32 are used as shown in FIG. 3, but the number of urging units 32 can be appropriately determined according to the situation of use.

  After completion of the communication connection process, a cleaning medium introduction / discharge process is performed. On the first manhole 16-1, a sherbet-like cleaning medium (fluid) 28 having ice particles and water was pressurized and introduced into the sewer pipe 14 from the delivery unit wheel 18. In the present embodiment, after the cleaning medium 28 introduced into the sewer pipe 14 forms a lump of approximately 10 m, that is, an ice pig, the pressure introduction of the cleaning medium 28 is stopped, and water is injected under pressure from the delivery unit vehicle 18. Then, the formed ice pig was moved downstream (indicated by an arrow 100 in FIG. 1).

  In the manhole 16, the upstream pipe 14-1 and the downstream pipe 14-2 are connected to each other using the above-described communication pipe 10, and the cleaning medium 28 is surely connected to the downstream sewer pipe without leaking into the manhole 16. 14 can be moved. As the cleaning medium 28 moves, the deposit 52 on the tube wall is scraped off and taken into the cleaning medium 28 and moves downstream. At the same time, contaminants (not shown) taken into the cleaning medium 28 also move downstream with the cleaning medium 28. The cleaning medium 28 containing the scraped deposit 52 and the taken-in contaminants is sucked and discharged by the collection vehicle 20 installed on the fourth manhole 16-4.

  It is necessary to remove the communication pipe 10 after completion of the cleaning operation. The removal operation can be easily performed. What is necessary is just to perform a procedure reverse to the procedure of introducing the communication pipe 10 into the manhole 16. That is, the biasing means 32 and the rubber bands 40-1 and 40-2 are removed, and the tubular intermediate portion 34 is removed from the upstream connection member 26-1 and the downstream connection member 26-2. Thereafter, the upstream connection member 26-1 and the downstream connection member 26-2 are respectively extracted from the upstream pipe 14-1 and the downstream pipe 14-2, and each member is carried out from the manhole 16 to complete the removal work.

  According to the present embodiment, the cleaning medium (fluid) 28 introduced into the upstream pipe 14-1 is reliably guided to the downstream pipe 14-2 through the communication pipe 10. Moreover, since the urging means 32 is used for the communication pipe 10, there is no fear that it will come off during the cleaning operation. Accordingly, it becomes possible to clean a sewer pipe having a plurality of manholes arranged in the middle. As a result, only the sewer pipe between the manhole and the adjacent manhole (one span) could be washed at a time, but the sewer pipe across multiple spans can be washed at one time, greatly reducing the work time. The work cost can be reduced.

  FIG. 6 shows a schematic overall view of the second embodiment of the communication pipe, which is related to the communication pipe used in the communication connection step of the method for cleaning a sewer pipe relay-connected by the manhole of the present invention. The characteristic feature of the present embodiment is that the communication pipe 10 is composed of a bellows pipe 60.

  At both ends of the bellows tube 60, connection portions 60a that can be connected to the upstream tube 14-1 and the downstream tube 14-2 are formed. The connecting portion 60a has an outer diameter that is substantially the same as the inner diameter of the sewer pipe 14, and is inserted into the sewer pipe 14 without a substantial gap. The connecting portion 60a is provided with a locking portion 60b for locking to the opening of the sewer pipe 14. The latching | locking part 60b is comprised by the flange which protruded outside from the outer peripheral surface of the connection part 60a. Furthermore, each connection portion 60a is provided with a grip portion 62, and the telescopic tube 60 can be contracted and transported by the grip portion 62.

  In the present embodiment, when the bellows tube 60 is in a normal state (extended state), its length is set longer than the interval between the opening of the upstream tube 14-1 and the opening of the downstream tube 14-2 in the manhole 16-2. Has been. Therefore, when attached in the manhole 16-2, the connecting portions 60a at both ends are urged in the direction in which the bellows tube 60 extends, and the locking portions 60b are engaged with the open ends of the sewer pipe 14 respectively. Stopped.

  FIG. 7 is an explanatory diagram showing a procedure for attaching the communication pipe 10 to the manhole. First, on the ground, for example, in a state where the bellows tube 60 is contracted, the rope 66 is passed and tied between the gripping parts 62, and then suspended and loaded into the manhole 16-2 (see FIG. 7A). After carrying in in the manhole 16-2, the edge part of one connection part 60a is inserted in the downstream pipe 14-2, for example (refer FIG.7 (b)). And the bellows pipe | tube 60 expand | extends by unraveling the rope 66 which tied between the holding parts 62, and the edge part of the other connection part 60a can be attached according to the opening part of the upstream pipe 14-1.

  When the bellows tube 60 is mounted in the manhole 16-2, the locking portion 60b is urged in opposite directions in the extending direction of the sewer pipe 14, so the locking portion 60b of the connecting portion 60a is It is securely locked to the openings of the upstream pipe 14-1 and the downstream pipe 14-2. Further, since there is a biasing force in the opposite direction in the extending direction, the communication tube 10 is detached when the cleaning medium flowing from the upstream tube 14-1 flows to the downstream tube 14-2 through the communication tube 10. Therefore, the cleaning operation can be performed accurately.

  The communication pipe 10 can be easily removed after the cleaning operation. For example, the bellows tube 60 is contracted using the gripping portion 62, the connecting portion 60 a is removed from the sewer pipe 14, and the gripping portion 62 is tied with a rope 66 so that the bellows tube 60 does not extend. Thereafter, the stretched bellows tube 60 can be easily removed by lifting it on the ground.

  Note that the present invention is not limited to the present embodiment. Various modifications can be made without departing from the scope of the present invention. For example, a sherbet-like fluid having ice particles and cleaning water was used as the cleaning medium 28, but the ratio of ice particles to cleaning water was about 3: 7. The ratio can be freely changed according to the size of the sewer pipe 14 and the degree of contamination. Increasing the ice particle ratio improves the cleaning ability, but increases the flow resistance when moving in the pipeline. Further, in the above embodiment, the ice pig is formed and water is injected from behind to move the ice pig. However, only the cleaning medium 28 may be continuously injected under pressure. Further, the flow rate of the cleaning medium 28 can be arbitrarily changed according to the diameter of the sewer pipe 14 to be cleaned and the degree of contamination.

  Further, in the first embodiment of the communication pipe 10, the tubular intermediate portion 34 is made of cloth. However, the tubular intermediate section 34 is introduced into the interior with flexibility that can be extended when the connection members are connected in communication. Any material may be used as long as it has strength to withstand the pressure of the cleaning medium. For example, rubber, plastic, cloth and synthetic materials thereof can be used. Furthermore, although the bellows tube 60 is used in the second embodiment of the communication tube 10, an expansion tube may be used. In this case, the inner surfaces of these brazing materials are preferably flattened to reduce the flow resistance of the cleaning medium.

10 Communication pipe 14 Sewage pipe (upstream pipe, downstream pipe)
16 Manhole 18 Delivery unit vehicle 20 Recovery vehicle 22 Hose 24 Closure 26 Connection member 28 Cleaning medium (fluid)
32 Energizing means 34 Tubular intermediate portion 52 Deposit 60 Bellows tube 100 Flow of ice pig

Claims (6)

In the method of cleaning sewer pipes with multiple manholes,
A communication connection step of connecting the openings connected to the sewer pipes on the upstream side and the downstream side of all the manholes present in the section to be cleaned using a communication pipe in the manholes;
After the communication connection step, a cleaning medium introduction / discharge step of pressurizing and introducing a sherbet-like cleaning medium containing ice particles and cleaning water from the upstream side of the section to be cleaned and discharging from the downstream side through the sewer pipe and the communication pipe When,
A method for cleaning a sewer pipe, comprising: The cleaning medium introduction / discharge step includes:
The upstream end of the section to be cleaned is closed using a closing tool,
The cleaning medium is pressurized and introduced through an opening provided in the obturator on the upstream side, and the cleaning medium flowing into the manhole is sucked and discharged on the downstream side. The method for cleaning a sewer pipe according to claim 1. A communication pipe used in the communication connection step of the method for cleaning a sewer pipe in which a plurality of manholes according to claim 1 or 2 are arranged,
An upstream connection member and a downstream connection member inserted and fixed in the sewer pipe from the opening on the upstream side and downstream side of the manhole, respectively;
A tubular intermediate portion that connects the upstream side and downstream side connection members in the manhole;
An urging means for urging the upstream connecting member and the downstream connecting member to press the manhole opening to maintain the mounted state;
A communication pipe characterized by comprising: The upstream and downstream connecting members are:
A tubular main body, and a flange formed to protrude radially outward from the sewer pipe at an intermediate position of the main body,
The main body part is an insertion end part into which one end part is inserted into the sewer pipe, and the other end part is an attachment end part to which the tubular intermediate part is attached,
The biasing means is
The communication pipe according to claim 3, wherein the communication pipe is interposed between the upstream and downstream connection members and biases both the connection members in a sewer extension direction.   5. The tubular intermediate portion is formed to be extendable and stretchable, has a length that allows the upstream and downstream connection members to communicate with each other in an extended state, and has flexibility. The communication pipe described in 1. A communication pipe used in the communication connection step of the method for cleaning a sewer pipe relay-connected by a manhole according to claim 1 or 2,
It is normally composed of a bellows tube or a bellows tube whose length is longer than the interval between the upstream and downstream sewer pipe openings,
The communicating pipe, wherein both ends of the bellows pipe or the bellows pipe are urged toward the opening side of the sewage pipe on the upstream side and the downstream side in a state of being installed in the manhole.

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