JP4603312B2 - Sealing unit used for pipe rehabilitation connection method - Google Patents

Description

The present invention relates to a sealing unit used in a pipeline rehabilitation connection method applied when, for example, a rehabilitation pipe lined with an existing pipe is connected to another existing pipe.

  Generally, when a pipe line buried in the ground is aged, the inner surface of the pipe line is lined with a resin rehabilitation pipe to reinforce the pipe line. For example, Patent Document 1 below discloses a rehabilitation method using a rehabilitation pipe made of a thermoplastic resin and exhibiting a cross-sectional shape that is degenerated into a bowl shape so as to recover a cylindrical shape at a shape recovery temperature. .

  The work procedure of this rehabilitation method will be described below. First, in a state where one end of a rehabilitation pipe having a cross-sectional shape that has been degenerated into a bowl shape is closed with a closing metal fitting or the like, the rehabilitation pipe is drawn into the existing pipe from the closing side through a manhole. Thereafter, the other end of the rehabilitation pipe is heated with steam or the like to partially recover its shape into a cylindrical shape. Then, the sealing unit is mounted on the end portion whose shape has been recovered. For example, as shown in FIG. 13, the sealing unit includes an inner core d provided with a steam supply pipe b and an air supply pipe c, and the rehabilitation pipe p in a state where the inner core d is attached to an end of the rehabilitation pipe p. And a ring member e that prevents the inner core d from coming off. After mounting the sealing unit a on the end of the rehabilitation pipe p in this way, steam is supplied from the steam supply pipe b to the inside of the rehabilitation pipe p, and the whole rehabilitation pipe p is heated to form a cylindrical shape. Let me recover. After removing steam from the rehabilitation pipe p, pressurized air is supplied from the air supply pipe c to the inside of the rehabilitation pipe p, the diameter of the rehabilitation pipe p is increased, and the outer surface thereof is brought into close contact with the inner surface of the existing pipe. Then, the said closure metal fitting and the sealing unit a are removed from the renovation pipe p, the edge part process of a renovation pipe is performed, and a lining operation | work is complete | finished.

  On the other hand, in the case of a pressure pipe that is a conduit for agricultural water or the like, if the pipe end is open in the manhole, the water may overflow from the manhole if the amount of water stored in the manhole increases. There is sex. For this reason, in this type of pipeline, the pipe ends of two pipes (upstream pipe and downstream pipe) facing the manhole are connected by a short tubular joint member.

  For this reason, for example, when one of the two pipes facing the manhole is lined with a rehabilitation pipe, the pipe end of the rehabilitation pipe and the pipe end of the existing pipe not rehabilitated are joined in the manhole. It is necessary to connect by members.

FIG. 14 shows a conventional configuration in which the rehabilitated pipe p and the existing pipe f are connected by a joint member h in the manhole g. As shown in this figure, since the pipe diameter of the existing pipe f is determined in advance, the inner diameter of one end of the joint member h (the left end portion in the drawing on the side connected to the existing pipe f) is outside the existing pipe f. It is set to approximately match the diameter. On the other hand, in the end portion (the right end portion in the figure) connected to the rehabilitation pipe p which is the other end side, the inner diameter is set to be large in advance in consideration of variations in the finished diameter of the rehabilitation pipe p. It is. And between the outer surface of this renovated pipe p and the inner surface of the joint member h was filled with the mortar i in the state which inserted the pipe end of the renovated pipe p in the edge part of the other end side of this joint member h.
JP 2002-303376 A

  However, when the space between the rehabilitated pipe p and the joint member h is filled with the mortar i as described above, the mortar i may flow into the pipe (see the arrow in the figure) and reduce the effective inner diameter of the pipe. There is sex. Further, when water (pressure water) is flowed after the construction, there is a possibility that the mortar i is cracked and water leakage occurs.

The present invention has been made in view of such points, and the object of the present invention is to facilitate connection work and reliability when connecting the pipe end of the rehabilitation pipe and the pipe end of another pipe. An object of the present invention is to provide a sealing unit used in a pipe rehabilitation connection method capable of obtaining a high connection state.

-Summary of invention-
The solution of the present invention devised to achieve the above object uses a member for sealing the inside of the rehabilitating pipe at the time of rehabilitation work (lining) of the existing pipe by the rehabilitating pipe. The end is connected to the pipe end of another pipe. In other words, a sealing unit for sealing the inside of the rehabilitation pipe is composed of a plurality of constituent members, and a configuration for connecting a part of the sealing unit to other members is used as it is. A connection structure between the member and the joint pipe is obtained.

-Solution-
Specifically, the present invention is a method of lining the inner surface of an existing pipe with a rehabilitation pipe and connecting the pipe end of the rehabilitation pipe and the pipe end of another pipe in a state where the respective pipe lines are in communication with each other. Assuming A rehabilitation step and a pipe splicing step are provided for this pipe rehabilitation connection method. In the rehabilitation process, a sealing unit including a first ring-shaped first member attached to the end of the rehabilitating pipe and a second member for closing the opening of the rehabilitating pipe is connected to the rehabilitating pipe. At the end, with the rehabilitation pipe drawn into the existing pipe, introduce the pressurized fluid into the rehabilitation pipe to expand the diameter of the rehabilitation pipe, and reattach the rehabilitation pipe to the inner surface of the existing pipe. I do. In the pipe joining process, after the rehabilitation process, only the second member is removed from the pipe end of the rehabilitation pipe, and a joint pipe is disposed between the pipe end of the rehabilitation pipe and the pipe end of another pipe. And the first member are coupled.

  By this specific matter, it becomes possible to connect the first member and the joint pipe using the connection structure of the first member to the second member in the sealing unit as it is. For example, when the first member and the second member are bolted by the bolt holes formed respectively, the same bolt hole is formed in the joint pipe, and the second member is removed from the first member. After the removal, a configuration in which the bolt hole of the first member and the bolt hole of the joint pipe are aligned and bolted, etc. is employed.

  Further, as one form to which the pipe connection method according to the present invention is applied, it is listed that two pipes (one is rehabilitated by a rehabilitation pipe) facing each other in a manhole are connected. Specifically, as each of the above steps in this case, the rehabilitation pipe is drawn into the existing pipe through the manhole in the rehabilitation process. In the pipe splicing process, a joint pipe is introduced into the manhole, and one end of the joint pipe is connected to an existing pipe that is not rehabilitated facing the manhole, and the other pipe end is attached to the rehabilitation pipe. The first member is connected to the first member.

The sealing units used pipe rehabilitation connection method described above, the flange portion extending on the outer peripheral side in the tube end outer drum portion and the rehabilitating pipe having a substantially tubular shape to be fitted inside the tube end of the further Namakan And a second member that has a disk shape whose outer diameter dimension substantially coincides with the outer diameter dimension of the flange portion, and that is overlapped with the flange portion to close the opening of the pipe end of the rehabilitation pipe. Is a sealing unit.

  In the present invention, a sealing unit for sealing the inside of the rehabilitated pipe is used, and the pipe end of the rehabilitated pipe is connected to the pipe end of another pipe. That is, after removing the 2nd member which comprises a sealing unit from the 1st member, a joint pipe is connected using the 1st member remaining at the pipe end of this renovated pipe. Conventionally, since the gap between the rehabilitated pipe and the joint was filled with mortar, there was a problem that the mortar flowed into the pipe line or the mortar was broken, but according to the present invention, this problem is solved. Therefore, the connection operation is easy and a reliable connection state can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This invention demonstrates the case where this invention is applied to the connection part of the renovated pipe and the existing pipe in a manhole.

(First embodiment)
First, the first embodiment will be described. Before describing the pipe connection method according to the present invention, the rehabilitation operation by the rehabilitation pipe for one of the two existing pipes facing the manhole will be described.

  FIG. 1 shows a state before rehabilitation work of a rehabilitation pipe 1 for rehabilitating an existing pipe. The rehabilitation pipe 1 is made of a thermoplastic resin material such as vinyl chloride resin, and is deformed so as to have a recess 11 extending along the longitudinal direction on the outer surface, and is formed into a degenerated shape having a reduced cross-sectional outer area. Has been.

  Further, the rehabilitation pipe 1 has a performance of recovering its shape to a cylindrical body by being heated to a predetermined shape recovery temperature (for example, 80 ° C.). In this case, the shape recovery temperature is a temperature at which the shape is recovered to a cylindrical shape only by heating without applying an external force such as pressure.

  The manufacturing method of this rehabilitation pipe | tube 1 is as follows. As shown in FIG. 2, first, a cylindrical body 10 of a thermoplastic resin material is extruded by an extruder 21, and the cylindrical body 10 is cooled by passing it through a cooling water tank 22. The outer surface is crushed in an atmosphere of a recovery temperature, and a recess 11 extending along the longitudinal direction is formed on the outer surface as shown in FIG. Thereafter, the cylindrical body 10 is pulled by the tensioning device 24 so that the cross-sectional outer area is reduced, and the cylindrical body 10 is wound on the drum 26 via the traverse portion 25.

  The rehabilitating pipe 1 manufactured in this way is restrained so that the pipe itself does not “recover naturally” under the influence of the outside air temperature until it is carried into the rehabilitation site of the existing pipe. It is preferable to constrain using or to store at low temperature.

  Next, rehabilitation work for existing pipes will be described. Here, as shown in FIG. 3, the existing pipe 3 embedded between the upstream manhole Q1 (manhole located on the left side in FIG. 3) and the downstream manhole Q2 (manhole located on the right side in FIG. 3). The case of rehabilitation will be described.

  The rehabilitation pipe 1 wound on the drum 26 is carried on the ground near the upstream manhole Q1. On the other hand, a winch 51 is disposed on the ground near the downstream manhole Q2. A guide portion 52 for guiding the wire 54 that pulls the rehabilitation pipe 1 is provided at the lower portion of the downstream manhole Q2. Prior to inserting the rehabilitation pipe 1 into the existing pipe 3, the inside of the existing pipe 3 is washed in advance and the protrusions are removed.

  Then, as a rehabilitation pipe laying step, as shown in FIG. 3, the tip of the wire 54 led out from the winch 51 is led from the lower end of the downstream manhole Q2 through the existing pipe 3 to the upstream manhole Q1. Then, the drum 26 is rotated, and the tip of the rehabilitation pipe 1 is led out to the lower end of the upstream manhole Q1, that is, the upstream end of the existing pipe 3.

  And the front-end | tip of the wire 54 is latched to the front-end | tip tool 53 previously attached to the front-end | tip of the rehabilitation pipe | tube 1. FIG. Thereafter, with the tip of the rehabilitation pipe 1 fed out from the drum 26 being inserted into the existing pipe 3, the rehabilitation pipe 1 is pulled by winding the wire 54 with the winch 51, and the rehabilitation pipe 1 is removed from the existing pipe 3. Pull inside. In the middle of this drawing, the rehabilitation pipe 1 is cut, and a sealing unit 6 described later is attached to this cut portion.

  By this operation, the rehabilitation pipe 1 is led from the upstream manhole Q1 side to the downstream manhole Q2 side and laid over the entire length of the existing pipe 3 connecting the upstream manhole Q1 and the downstream manhole Q2. The arrangement | positioning state of the renovated pipe 1 in the existing pipe 3 in this case is shown to Fig.4 (a).

  Then, it progresses to a lining process. In this lining process, as shown in FIG. 5, a steam generator / pressurizer 55 is disposed on the ground near the upstream manhole Q1, and a water / steam separator 56 is disposed on the ground near the downstream manhole Q2. . A hose 55 a extending from the steam generator / pressurizer 55 is connected to the sealing unit 6 attached to the rehabilitation pipe 1, and a hose 56 a extending from the water / steam separator 56 is connected to the tip tool 53 at the tip of the rehabilitation pipe 1.

  In this state, steam is continuously supplied from the steam generator / pressurizer 55 into the rehabilitation pipe 1, and the rehabilitation pipe 1 is heated from its inside to the shape recovery temperature while flowing down to the water / steam separator 56. Then, the shape is restored to a substantially original cylindrical body. The state of the renovated pipe 1 in the existing pipe 3 at this time is shown in FIG.

  After rehabilitating the rehabilitating tube 1 to a cylindrical body in this way, the tip 53 is sealed and heated compressed air is sent into the rehabilitating tube 1 from the steam generator / pressurizer 55 to rehabilitate the rehabilitating tube 1. Then, it is heated and pressurized from the inside to be brought into close contact with the inner surface of the existing pipe 3 (the state of the rehabilitated pipe 1 in the existing pipe 3 at this time is shown in FIG. 4 (c)). After fixing, the lining operation of the inner surface of the existing pipe 3 is completed.

  Next, the sealing unit 6 attached to the end part of the rehabilitation pipe 1 will be described. FIG. 6 is an exploded perspective view showing a state when the sealing unit 6 is attached to the end portion of the rehabilitation pipe 1. As shown in this figure, the sealing unit 6 includes an inner member 61 attached to the pipe end of the rehabilitation pipe 1, a closing plug member 62 attached to the inner member 61, and the inner member 61 falls off the rehabilitation pipe 1. A band 63 is provided to prevent this.

  The inner member 61 includes a cylindrical drum portion 61a having an outer diameter that substantially matches the inner diameter of the tube end of the rehabilitation pipe 1, and a flange portion 61b that extends from one end edge of the drum portion 61a to the outer peripheral side. I have. The flange portion 61b is formed with bolt holes 61c, 61c,... That are through-holes at a plurality of locations (eight locations in the present embodiment) at predetermined angular intervals in the circumferential direction.

  Further, a return portion 61d is formed in a chevron-like shape at the front end portion (the end portion opposite to the side where the flange portion 61b is formed) of the drum portion 61a. When attached to the tube 1, it does not fall off easily.

  On the other hand, the closing plug member 62 is a metal disk-like member whose outer diameter dimension substantially matches the outer diameter dimension of the flange portion 61b, and is overlapped with the flange portion 61b at the outer peripheral edge portion. At the same time, similar bolt holes 62a, 62a,... Are formed at locations that coincide with the formation positions of the bolt holes 61c, 61c,. For this reason, the plug member 62 is overlapped with the flange portion 61b of the inner member 61, and bolts are inserted through the respective bolt holes 61c and 62a. 62 is integrally assembled with the inner member 61, and the opening (the space inside the drum portion 61 a) of the inner member 61 is closed by the closing plug member 62. An elbow 62b (see FIG. 8) for connecting a hose 55a extending from the steam generator / pressurizer 55 is attached to the plug member 62 (not shown in FIG. 6).

  The band 63 is tightened from the outer surface side to the inner peripheral side of the rehabilitation tube 1 in a state where the drum portion 61a of the inner member 61 is inserted into the rehabilitation tube 1, whereby the inner surface of the rehabilitation tube 1 is connected to the drum portion. The inner member 61 is prevented from falling off the rehabilitation pipe 1 by being firmly engaged with the return portion 61d of 61a.

  That is, when the sealing unit 6 is attached to the end portion of the rehabilitation pipe 1, first, the drum portion 61 a of the inner member 61 is inserted into the rehabilitation pipe 1, and the band 63 is inserted from the outer surface side of the rehabilitation pipe 1. The inner member 61 is attached to the rehabilitation pipe 1 by tightening toward the inner peripheral side. Thereafter, the closing plug member 62 is overlapped with the flange portion 61b of the inner member 61, a bolt is inserted through each of the bolt holes 61c and 62a, and a nut is screwed into the bolt to thereby connect the closing plug member 62 to the inner member 61. Assemble as one. As a result, the sealing unit 6 is attached to the end portion of the rehabilitation pipe 1. Note that the inner member 61 may be inserted into the rehabilitation pipe 1 and attached after the closing plug member 62 is assembled to the inner member 61.

  Next, the joint pipe 8 for connecting the rehabilitated pipe 1 after the rehabilitation and the existing pipe 7 facing the manhole Q1 will be described. FIG. 7 is a perspective view showing the joint pipe 8. As shown in this figure, the joint pipe 8 includes a straight pipe portion 81 having an inner diameter dimension substantially equal to the inner diameter dimension of the existing pipe 7 at the central portion in the axial direction. The existing pipe connection side of the straight pipe portion 81 is provided with an existing pipe connection portion 83 having an inner diameter dimension that substantially matches the outer diameter dimension of the existing pipe 7 via the taper portion 82. On the other hand, a flange 84 that substantially matches the shape of the flange portion 61b of the inner member 61 is formed on the rehabilitation pipe connection side with respect to the straight pipe portion 81, and the flange portion 61b is superimposed on the flange 84. At the same time, similar bolt holes 84a, 84a,... Are formed at locations corresponding to the formation positions of the bolt holes 61c, 61c,.

  Next, the operation | work which connects the renovated pipe 1 and the existing pipe 7 in the manhole Q1 is demonstrated. As explained in the rehabilitation work, the rehabilitation pipe 1 is cut in the middle of drawing the rehabilitation pipe 1 into the existing pipe 3, and the sealing unit 6 is attached to the cut portion. FIG. 8 shows the retracted state after the sealing unit 6 is attached to the rehabilitation pipe 1. In addition, after drawing the rehabilitation pipe 1 to a predetermined position in the existing pipe 3, the sealing unit 6 may be attached to the end of the rehabilitation pipe 1.

  After the rehabilitation pipe 1 is drawn to a predetermined position, steam is continuously supplied from the steam generator / pressurizer 55 into the rehabilitation pipe 1 through the hose 55a and the sealing unit 6 as described above. Thereby, the shape of the rehabilitation pipe | tube 1 is recovered to a cylindrical body. Thereafter, heated compressed air is sent into the rehabilitation pipe 1 so that the rehabilitation pipe 1 is in close contact with the inner surface of the existing pipe 3. This state is shown in FIG.

  After the lining operation by the rehabilitation pipe 1 is completed by the above operation, as shown in FIG. 10, the bolt B that has fastened the closing plug member 62 to the inner member 61 is removed, and the closing plug member 62 is removed from the inner member 61. Detach and lift only the plug member 62 to the ground. In this state, the opening of the inner member 61 attached to the end of the rehabilitation pipe 1 and the existing pipe 7 are opposed to each other through the internal space of the manhole Q1.

  Thereafter, the mounting operation of the joint pipe 8 is started. In this operation, first, the joint pipe 8 and the existing pipe 7 are joined such that the tip of the existing pipe 7 enters the existing pipe connection portion 83 of the joint pipe 8. Then, as shown in FIG. 11, the flange 84 of the joint pipe 8 and the flange portion 61b of the inner member 61 are overlapped, and the positions of the bolt holes 84a and 61c of both the members 84 and 61b are matched. Then, the bolt B is inserted into each of the bolt holes 84a and 61c, and the nut N is screwed into the bolt B so that the joint pipe 8 and the inner member 61 are assembled together. As a result, in the manhole Q1, the rehabilitation pipe 1 and the existing pipe 7 are connected through the joint pipe 8 in a state where the pipes are in communication with each other, and a configuration in which water does not overflow from the manhole Q1 is constructed. can do.

  As described above, in this embodiment, the sealing unit 6 includes the inner member 61 and the blocking plug member 62, and after removing the blocking plug member 62 from the inner member 61, the inner member 61 remaining at the pipe end of the rehabilitation pipe 1. The joint pipe 8 is connected using the above. Conventionally, since the gap between the rehabilitated pipe and the joint was filled with mortar, there was a problem that the mortar flowed into the pipe line or the mortar was broken, but according to this form, this problem is solved. Therefore, the connection operation is easy and a reliable connection state can be obtained.

(Second Embodiment)
Next, a second embodiment will be described. In this embodiment, the shapes of the existing pipe 7 and the joint pipe 8 are different from those of the first embodiment described above. Since other configurations are the same as those of the first embodiment described above, only the shapes of the existing pipe 7 and the joint pipe 8 will be described here.

  FIG. 12 shows a connection state between the rehabilitation pipe 1 and the existing pipe 7 according to this embodiment. As shown in this figure, the existing pipe 7 according to this embodiment has a flange 71 integrally formed at the opening edge. To cope with this, a flange 72 similar to the flange 71 of the existing pipe 7 is formed at the end of the joint pipe 8 on the existing pipe connection side. The flanges 71 and 84 of the existing pipe 7 and the joint pipe 8 are formed with bolt holes that are aligned with each other. Bolts B are inserted into the bolt holes, and nuts N are inserted into the bolts B. The existing pipe 7 and the joint pipe 8 are integrally assembled by screwing.

  In addition, since the connection form of the joint pipe 8 and the inner member 61 is the same as that of the first embodiment described above, description thereof is omitted here.

-Other embodiments-
Each embodiment described above demonstrated the case where this invention was applied when connecting the rehabilitation pipe | tube 1 and the existing pipe | tube 7 of a non-rehabilitation state within the manhole Q1. The present invention is not limited to this, and can also be applied to the case of connecting pipes in places other than manholes or the case of connecting rehabilitated pipes.

It is a perspective view which shows a part of rehabilitation pipe | tube before rehabilitation work. It is a schematic diagram for demonstrating the manufacturing process of a rehabilitation pipe | tube. It is a schematic diagram for demonstrating the rehabilitation pipe | laying process of drawing a rehabilitation pipe | tube inside the existing pipe | tube. (A) is a cross-sectional view showing a state in which the rehabilitation pipe is drawn into the buried pipe, (b) is a cross-sectional view showing a state in which the rehabilitation pipe is heated and its shape is restored, and (c) is a state in which the rehabilitation pipe is added. It is sectional drawing which shows the state expanded by pressure and closely_contact | adhered to the inner surface of the embedding main pipe. It is a schematic diagram for demonstrating the lining process which lines a rehabilitation pipe | tube in an existing pipe | tube. It is a disassembled perspective view which shows the state at the time of a sealing unit being attached to the edge part of a renovated pipe. It is a perspective view showing a joint pipe concerning a 1st embodiment. It is sectional drawing of the manhole which shows the drawing-in state in the state which attached the sealing unit to the rehabilitation pipe | tube, and its periphery. It is sectional drawing of the manhole which shows the state after the diameter expansion process of a rehabilitation pipe | tube, and its periphery. It is sectional drawing of the manhole which shows the state at the time of removing | separating an obstruction | occlusion stopper member from an inner member, and its periphery. It is sectional drawing of the manhole and its periphery which show the state where the renovated pipe and the existing pipe were connected by the joint pipe. It is a figure equivalent to FIG. 11 in 2nd Embodiment. It is a perspective view which shows the state by which the sealing unit was mounted | worn with the rehabilitation pipe | tube in the prior art example. It is a figure equivalent to FIG. 11 in a prior art example.

1 Rehabilitation pipes 3 and 7 Existing pipe 6 Sealing unit 61 Inner member (first member)
61a Drum part 61b Flange part 62 Blocking plug member (second member)
8 Joint pipe

Claims (1)

A sealing unit including a first ring-shaped first member attached to the pipe end of the rehabilitation pipe and a second member closing the opening of the pipe end of the rehabilitation pipe is attached to the pipe end of the rehabilitation pipe. A rehabilitation process in which a pressurized fluid is introduced into the rehabilitation pipe while the pipe is pulled into the existing pipe to expand the diameter of the rehabilitation pipe, and the rehabilitation pipe is reattached to the inner surface of the existing pipe. After the rehabilitation step, only the second member is removed from the pipe end of the rehabilitation pipe, and a joint pipe is disposed between the pipe end of the rehabilitation pipe and the pipe end of the other pipe, and the joint pipe and the first member. A sealing unit used in a pipe rehabilitation connecting method comprising a pipe splicing process for connecting
A substantially cylindrical drum portion fitted inside the pipe end of the rehabilitated pipe and a first member provided with a flange part spreading outward on the outer side of the pipe end of the rehabilitated pipe, and a disc-like member that is superimposed on the flange part. And a second member that closes the opening of the tube end of the rehabilitated tube.

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