JP6465757B2 - Pipe connection structure and pipe connection method in a manhole - Google Patents

Description

  The present invention relates to a pipe connection structure and method in a manhole, and more particularly to a structure and method for connecting pipes lined by a rehabilitation method.

  In sewers and the like, there is a problem that unknown water (such as groundwater entering the pipe from the leaked part of the pipe) enters the aging pipe. In particular, when seawater is mixed in unknown water and the salinity becomes high, it is important to prevent the intrusion of unknown water because corrosion of facilities in the sewerage system proceeds. In recent years, a synthetic resin pipe is inserted into an aging pipe line for lining. This makes it possible to take measures against unknown water in the pipeline (main pipe).

  In addition, manholes are formed in the sewer system at appropriate intervals, and the ends of the pipelines lined by the rehabilitation method are cut along the manhole wall or in a state of protruding several centimeters. After that, in consideration of catching of filth, etc., it is gently finished with mortar or the like so that there is no step between the invert or manhole wall and the renovated pipe. However, when an aging pipe line is constructed, even if lining with a rehabilitated pipe is performed, unknown water permeates from the joints and cracks of the aged existing pipe, and the existing pipe and rehabilitated pipe It goes around and turns around to the manhole port. For this reason, it cannot be said that the lining of the rehabilitation method alone is a complete countermeasure against intrusion.

Currently, as a method of stopping unknown water at the manhole pipe lined by the rehabilitation method, (1) In the pipe mouth finishing mentioned above, focus is placed on the location where water comes around by mortar, epoxy resin, etc. Filling and stopping the water,
(2) Before the rehabilitation pipe lining, water expansion rubber, sealant, etc. are installed in advance on the inner surface of the existing pipe near the manhole, and the rehabilitation pipe is lined so as to sandwich it,
(3) A method to stop water by injecting urethane or water glass-based chemicals into the place where unknown water enters,
Etc. are adopted.

  Patent Document 1 discloses a configuration in which an end of an existing pipe and an end of a renovated pipe are connected by a joint member in a manhole. In this connection method, since the manhole port in the rehabilitation pipe is eliminated, infiltration of unknown water into the pipe line can be prevented.

Japanese Patent No. 4603312

  However, with the method (1) above, inverts and manholes are aging in the first place, and it is not possible to give the inverts and manholes enough adhesiveness and water-stopping properties to stop the unknown water for a long time. difficult.

  Further, in the method (2), it is difficult to ensure the sealing performance between the old pipes and the sealing materials. Long-term performance verification of water-expanded rubber and sealant is currently insufficient, and there remains a problem for long-term use.

  In the above method (3), chemical injection is effective for temporary water stoppage, but it is not effective for long-term water stoppage. Become.

  In addition, in the configuration disclosed in Patent Document 1, it is necessary to perform lining of the rehabilitated pipe and at the same time to connect the existing pipe with the existing pipe. . Also, assuming that the pipe on the other end to be connected has already been constructed, there is no protrusion at the end of the manhole. A large amount of processing is required to connect the pipes such as protruding.

  The present invention has been made in view of the above problems, and can be applied to pipes (rehabilitated pipes) that have already been completed without requiring large-scale processing such as opening the pipe opening of existing pipes. It is an object of the present invention to provide a pipe connection structure and method capable of reliably preventing water leakage at the manhole pipe mouth of a pipe over a long period of time.

  In order to solve the above problems, the present invention provides a pipe connection structure for connecting a rehabilitated pipe lined in an existing pipe to another pipe through a manhole, and the end of the rehabilitated pipe is It is excised so that it is retracted to the inner side of the existing pipe from the inner wall of the manhole, and one end has the same outer diameter as the rehabilitated pipe, and the one end is excised from the rehabilitated pipe. A pipe member that is inserted into the existing pipe at the formed portion and is abutted with the end of the rehabilitated pipe, and the other end projects from the inner wall of the manhole to the inner side of the manhole; An inner surface band that is pressure-bonded from the inner surface side to the connection portion between the end portion of the rehabilitated pipe and the end portion of the tube port member, and the tube port member and the other pipe line are sealed. A connecting member to be connected It is.

  According to said structure, when connecting a rehabilitation pipe | tube to another pipe line in a manhole, it can connect without a gap through a pipe opening member and a connection member, and the pipe line (it has already completed construction ( Without requiring a large-scale treatment in the rehabilitation pipe, it is possible to reliably prevent water leakage at the manhole port of the rehabilitation pipe for a long period of time.

  In the pipe connection structure, at least one of the pipe opening members has one end portion having the same outer diameter as the rehabilitated tube, and the other end portion having a larger outer diameter than the rehabilitated tube. The reducer joint can be configured as follows.

  According to said structure, even if the end part outer diameter of a rehabilitation pipe | tube and the end part outer diameter of a connection member are different diameters, it becomes connectable with a reducer. For this reason, the diameter of the connecting member to be used becomes arbitrary, and a general-purpose vinyl chloride pipe or the like can be used.

  Moreover, in the said pipe line connection structure, the said connection member can be set as the structure by which the opening part was provided in the upper part.

  According to the above configuration, it is possible to perform high-pressure cleaning from the opening, or to conduct an internal investigation by placing a self-propelled TV camera in the tube, and without disassembling the pipe connection structure, Maintenance such as investigation is possible.

  Further, in the pipe connection structure, the connection member is connected to at least one of the pipe port members via a rubber member, and at a connection location via the rubber member, between the connection member and the pipe port member. It can be set as the structure by which a space | gap is provided.

  According to the above configuration, even if a relative displacement occurs between the end surface of the pipe port member and the end surface of the connection member due to the ground displacement at the time of the earthquake, the displacement can be absorbed by the deformation of the rubber member, and the pipe connection It becomes possible to maintain the sealing performance in the structure. That is, earthquake resistance can be given to the pipe connection structure.

  Further, in the pipe connection structure, the connection member is connected to at least one of the pipe port members via a rubber member, and at a connection location via the rubber member, between the connection member and the pipe port member. It is possible to adopt a configuration in which a stuffing tube is disposed on the inner surface to eliminate a step on the inner surface between the connection member and the tube opening member.

  According to said structure, the level | step difference of the inner surface between a connection member and a pipe opening member is eliminated with the interlining pipe | tube, and it can suppress that filth etc. remain in the level | step difference of a pipe bottom part.

  Moreover, in the said pipe line connection structure, the said connection member can be set as the structure connected through the exchange coupling which can slide at least one said pipe port member and an axial direction at one end.

  According to said structure, it becomes possible to achieve both cancellation of the level | step difference in a pipe line, and provision of earthquake resistance. That is, the connection portion between the exchange joint and the pipe port member can be connected in a state where the end portions are abutted with each other, and no step is generated in this portion, so that retention of dirt and the like can be suppressed. Further, at the connection portion between the exchange joint and the connection member, the exchange joint is slidable relative to the connection member while sealing this portion. For this reason, even if a relative displacement in the axial direction occurs between the connecting member and the exchange joint due to ground displacement during an earthquake, the displacement can be absorbed by the above-mentioned sliding movement, and the sealing performance in the pipe connection structure is maintained. can do.

  Further, in the pipe connection structure, the inner surface band may have a seal length that allows an amount of withdrawal that may occur due to an earthquake. In general, rehabilitation pipes are designed based on the “Guidelines for Design and Construction Management (Draft) in the Pipe Rehabilitation Method” (December 2011, Japan Sewerage Association). In addition, the design for earthquake resistance is described in the above guidelines as conforming to “Guidelines for Seismic Measures for Sewerage Facilities and Explanation” (Japan Sewerage Association, 2006), and examples of design calculations are posted. For this reason, the configuration having an allowable seal length for the amount of slippage that can occur due to the above-mentioned earthquake means that the seal length of the inner surface band is larger than the amount of slippage determined by the calculation method shown in the above guidelines. To do.

  In order to solve the above-described problems, the present invention provides a pipe connection method for connecting a rehabilitated pipe lined in an existing pipe to another pipe through a manhole, wherein the end of the rehabilitated pipe is cut off. A step of retracting the end portion of the rehabilitated pipe to the inner side of the existing pipe with respect to the inner wall of the manhole, and a tube member having an end portion having substantially the same outer diameter as the rehabilitated pipe on the existing pipe. Insert the pipe member so that one end of the tube member and the end of the rehabilitation pipe are abutted, and the other end protrudes to the inner side of the manhole from the inner wall of the manhole. And a step of pressure-bonding an inner band provided with a cylindrical elastic body from the inner surface side to a connection portion between the end portion of the rehabilitated tube and the end portion of the tube opening member that are faced to each other, and A process for connecting the pipe opening member to the other pipe using a connecting member. It is characterized by having and.

  According to the above configuration, similar to the pipe connection structure described above, water leakage at the manhole port of the rehabilitated pipe is not required in the pipe line (rehabilitated pipe) that has already been completed. Can be reliably prevented for a long time.

  Further, in the pipe connection method, the other pipe line is another rehabilitation pipe lined in another existing pipe, and an end portion of the rehabilitation pipe is located on the inner wall of the manhole on the other rehabilitation pipe side. A step of cutting so as to be retracted to the inner side of the existing pipe, and one end is inserted into the existing pipe at a portion where the rehabilitated pipe is cut and is abutted with the end of the rehabilitated pipe And the step of arranging the tube member so that the other end protrudes to the inner side of the manhole from the inner wall of the manhole, and the connecting portion between the end of the renovated tube and the end of the tube member is sealed. In order to stop, the inner band is crimped from the inner surface side and sealed, and the connection member can be configured to connect the pipe port members to each other.

  According to said structure, this invention is applicable when connecting renovated pipes within a manhole.

  In the pipe connection method, the other pipe is another existing pipe that is not lined with a rehabilitation pipe, and an end of the existing pipe is connected to the inner wall of the manhole on the other existing pipe side. A step of cutting so as to be retracted to the inner side of the existing pipe, and one end is inserted in a portion where the existing pipe is cut and is abutted with the end of the existing pipe, and The step of arranging the tube port member so that one end portion protrudes to the inner side of the manhole from the inner wall of the manhole and the connection portion between the end portion of the existing pipe and the end portion of the tube port member are sealed. And a step of crimping and sealing the inner surface band from the inner surface side, and the connection member can be configured to connect the tube port members to each other.

  According to said structure, this invention is applicable when connecting a renovated pipe and an existing pipe within a manhole.

  The pipe connection method of the present invention can connect rehabilitated pipes or rehabilitated pipes and existing pipes without gaps in the manhole via the pipe opening member and the connecting member, and pipes that have already been completed ( Without requiring a large-scale treatment in the rehabilitation pipe, it is possible to reliably prevent water leakage at the manhole port of the rehabilitation pipe for a long period of time.

In the pipe connection structure in the manhole which concerns on Embodiment 1, it is a longitudinal cross-sectional view which shows the state before construction. (A), (b) is a longitudinal cross-sectional view which shows the process in the pipe line connection structure in the manhole which concerns on Embodiment 1. FIG. (A), (b) is a longitudinal cross-sectional view which shows the process in the pipe line connection structure in the manhole which concerns on Embodiment 1. FIG. It is a figure which shows the external appearance of the inner surface band used for a pipe-line connection structure, (a) is the whole perspective view, (b) is the perspective view which expanded a part. (A), (b) is a figure which shows the attachment method of an inner surface band. (A), (b) is a longitudinal cross-sectional view which shows the process in the pipeline connection structure in the manhole which concerns on Embodiment 2. FIG. It is a figure which shows the other example of a reducer used for a pipe-line connection structure. It is a longitudinal cross-sectional view which shows the pipe line connection structure in the manhole which concerns on Embodiment 3. FIG. It is a longitudinal cross-sectional view which shows the other example of the pipe-line connection structure in the manhole which concerns on Embodiment 3. It is a longitudinal cross-sectional view which shows the pipe line connection structure in the manhole which concerns on Embodiment 4. It is a longitudinal cross-sectional view which shows the pipe line connection structure in the manhole which concerns on Embodiment 5.

[Embodiment 1]
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing a state before construction in a pipe connection structure in a manhole. In this state, the rehabilitation pipe 3 is already lined with respect to the existing pipe 2 on both sides of the manhole 1. About the lining method of the rehabilitation pipe | tube 3, since the well-known method as described in patent document 1 etc. is applicable, detailed description is abbreviate | omitted here. Further, an invert 4 is disposed at the bottom of the manhole 1.

  The construction procedure of the pipe connection structure according to the first embodiment is shown in FIGS. 2 (a) and 2 (b) and FIGS. 3 (a) and 3 (b). First, as shown in FIG. 2A, the invert 4 is removed. Then, as shown in FIG.2 (b), the edge part of the rehabilitation pipe | tube 3 is excised. As a result, the end portion of the rehabilitating pipe 3 is retracted by the first predetermined amount L1 to the inner side of the existing pipe 2 from the inner wall of the manhole.

  Next, as shown in FIG. 3A, the tube port member 5 is connected to the end of the rehabilitated tube 3. The tube port member 5 is a cylindrical tube-shaped member having substantially the same outer diameter as that of the rehabilitated tube 3 and longer than the first predetermined amount L1. The tube port member 5 is arranged so that one end portion thereof is inserted into the existing tube 2 and abutted against the end portion of the rehabilitated tube 3. The other end of the tube port member 5 protrudes toward the inner side of the manhole from the inner wall of the manhole. Furthermore, an inner surface band 6 is pressure-bonded from the inner surface side to a connection portion between the end portion of the rehabilitated pipe 3 and the end portion of the tube port member 5 which are abutted to seal the connection portion. In the above description, “matching the end portions” is not limited to the configuration in which the end portions are brought into contact with each other, and there is a slight gap (for example, about 1 cm) between the facing end portions. Is also included.

  In addition, since the end portion of the rehabilitated tube 3 is retracted by a first predetermined amount L1 from the inner wall of the manhole, the connection portion between the rehabilitated tube 3 and the tube port member 5 where the inner surface band 6 is crimped from the inner surface side, The existing pipe 2 exists on the outer surface side. Thereby, the said connection location becomes a structure pinched | interposed by the inner surface band 6 and the existing pipe 2, and the stable connection (sealing) is attained.

  Here, the specific structure and attachment method of the inner surface band 6 will be described with reference to FIGS. 4 (a) and 4 (b) and FIGS. 5 (a) and 5 (b). As shown in FIGS. 4A and 4B, the inner surface band 6 includes a rubber ring 61 and two metal bands (for example, SUS bands) 62 disposed on the inner surface side of the rubber ring 61 and at both ends.・ Has 62 The metal band 62 has a gap in a part in the circumferential direction, and has screw holes for attaching a jig at both ends of the gap.

  Specifically, as shown in FIG. 5A, a jig is attached to both ends of the gap in the metal band 62, and the gap between these jigs is expanded using a screw or the like. Increase the diameter. Then, as shown in FIG. 5B, in the state where the diameter of the metal band 62 is expanded, the wedge member 63 is fitted into the gap, and the jig is removed to complete the attachment of the inner surface band 6. In order to expand the space between the jigs, hydraulic jacks may be used instead of screws.

  In the inner surface band 6, one metal band 62 is disposed at a location facing the end of the rehabilitating tube 3, and the other metal band 62 is disposed at a location facing the end of the tube port member 5. Thereby, the inner surface band 6 can seal reliably the connection part of the renovated pipe 3 and the pipe opening member 5 which were faced | matched.

  Moreover, it is desirable that the inner surface band 6 has a seal length that allows an amount of slippage that can occur due to an earthquake. In general, rehabilitation pipes are designed based on the “Guidelines for Design and Construction Management (Draft) in the Pipe Rehabilitation Method” (December 2011, Japan Sewerage Association). In addition, the design for earthquake resistance is described in the above guidelines as conforming to “Guidelines for Seismic Measures for Sewerage Facilities and Explanation” (Japan Sewerage Association, 2006). Designed to learn from it.

  At the time of an earthquake, the rehabilitation pipe also receives a forced displacement due to the ground displacement, and comes out of the manhole or protrudes, but the amount can be determined by the calculation method shown in the above guidelines. Specifically, four types of withdrawal amounts are obtained by calculation, and the design is performed so as to be able to withstand it (so that the seal length of the inner surface band 6 is larger than the withdrawal amount obtained by the calculation). The calculated amount of protrusion (protrusion amount) differs depending on the ground conditions and the extension of the pipeline, but the amount is within 50 to 100 mm at most, so this amount is allowed. If possible, it is considered to be earthquake resistant. That is, the seal length of the inner surface band 6 is preferably 50 mm or more.

  Next, as shown in FIG. 3 (b), the connecting member 7 is attached between the pipe port members 5, 5 attached to the existing pipe 2 on both sides of the manhole 1. The connecting member 7 is a cylindrical tube-shaped member having substantially the same outer diameter as that of the tube port member 5, and is used by being cut out to a length that can be disposed without any gap between the tube port members 5. A connection portion between the end portion of the connection member 7 and the end portion of the pipe port member 5 is covered from the outer surface side by the rubber hose 8 so that the connection portion is sealed.

  The rubber hose 8 can be attached by the following procedure. The rubber hose 8 is first fitted into both end portions of the outer peripheral surface of the connection member 7. Thereafter, the connecting member 7 is disposed between the tube port members 5, 5, and then the rubber hose 8 is moved to the tube port member 5 side along the axial direction of the connecting member 7, thereby connecting the connection member 7 and the tube port member 5. The connection part may be covered. Further, by tightening both ends of the rubber hose 8 (the connecting member 7 side and the tube port member 5 side) with a general-purpose hose band (not shown), the connecting portion between the connecting member 7 and the tube port member 5 is securely sealed. it can.

  As described above, the pipe connection structure (see FIG. 3B) according to the first embodiment can be provided. This pipe connection structure can be applied when rehabilitating pipes 3 are connected to each other via manhole 1, and unknown water from the manhole pipe mouth (ground water passing between existing pipe 2 and rehabilitation pipe 3, The deterioration of manholes can prevent the ingress of seawater that enters from seams and cracks.

[Embodiment 2]
Hereinafter, Embodiment 2 of the present invention will be described in detail with reference to the drawings. Since the construction procedure of the pipeline connection structure according to the second embodiment is the same as that of the first embodiment up to the step shown in FIG. 2 (b), the subsequent steps are shown in FIGS. 6 (a) and 6 (b). Will be described.

  As shown in FIG. 6A, after the end portion of the rehabilitating tube 3 is excised, a reducer (reducer joint) 9 is connected to the end portion of the rehabilitating tube 3. The reducer 9 is a pipe joint for connecting pipes having different diameters, and one end portion has substantially the same outer diameter as that of the rehabilitation pipe 3, and the other end portion has a larger outer diameter. . The reducer 9 is disposed so that one end is inserted into the existing pipe 2 and abuts the end of the rehabilitated pipe 3. The other end of the reducer 9 protrudes toward the inner side of the manhole from the inner wall of the manhole. Furthermore, an inner surface band 6 is pressure-bonded from the inner surface side to a connection portion between the end portion of the rehabilitated pipe 3 and the end portion of the reducer 9, thereby sealing the connection portion. The structure and attachment method of the inner surface band 6 are the same as those in the first embodiment.

  Next, as shown in FIG. 6B, the connecting member 10 is attached between the reducers 9 and 9 attached to the existing pipes 2 on both sides of the manhole 1. The connecting member 10 used here is, for example, a general-purpose vinyl chloride pipe (VU). By making the other end of the reducer 9 have substantially the same outer diameter and inner diameter as the connection member 10, connection is possible even when the diameters of the rehabilitation pipe 3 and the connection member 10 are different. The connection portion between the end portion of the reducer 9 and the end portion of the connection member 10 is covered with the rubber hose 8 from the outer surface side so that the connection portion is sealed. The method of attaching the rubber hose 8 is the same as that of the first embodiment.

  In the second embodiment, the axial length of the connecting member 10 is shorter than the dimension between the reducers 9 and 9. Thereby, at least one of the connection part of the reducer 9 and the connection member 10 has a space between the end surface of the reducer 9 and the end surface of the connection member 10, and the space is sealed only by the rubber hose 8. Become. This structure is effective for providing seismic resistance in the pipe connection structure. That is, even if a relative displacement occurs between the end surface of the reducer 9 and the end surface of the connecting member 10 due to the ground displacement at the time of the earthquake, the displacement can be absorbed by the deformation of the rubber hose 8, and the sealing property in the pipe connection structure Can be maintained. Also, the rubber hose 8 desirably has a seal length that allows an amount of slippage that may occur due to an earthquake, as with the inner surface band 6. For this reason, the axial length (seal length) of the overlapping portion between the connecting member 10 and the rubber hose 8 and the axial length (seal length) of the overlapping portion between the reducer 9 and the rubber hose 8 are 50 mm or more in total. It is desirable to be Moreover, when providing the earthquake resistance by the rubber hose 8, the rubber hose 8 is not limited to a straight pipe shape but may be a bellows shape. In addition, there are two possible forced displacements of the pipeline due to the earthquake: a direction to exit from the manhole and a direction to protrude from the manhole. The inner band 6 described above can absorb the displacement in the pulling-out direction, but the rubber hose 8 can absorb the displacement in the protruding direction.

  As described above, the pipe connection structure (see FIG. 6B) according to the second embodiment can be provided. In addition to the effects described in the first embodiment, this pipe connection structure can use a general-purpose vinyl chloride pipe (VU) for connecting the rehabilitated pipes 3 and 3 by using the reducer 9. For example, when the existing pipe 2 has an outer diameter of 250 mm (fume pipe), a general-purpose vinyl chloride pipe having an outer diameter of 267 mm can be used. Further, by providing a gap between the end face of the reducer 9 and the end face of the connecting member 10, the pipe connection structure can be made to have earthquake resistance.

  The reducer 9 described in FIGS. 6A and 6B uses a non-eccentric reducer, but as shown in FIG. It can also be a specification to lose. In this case, it is possible to suppress dirt and the like from staying at the step at the bottom of the tube.

[Embodiment 3]
Hereinafter, Embodiment 3 of the present invention will be described in detail with reference to the drawings. Since the construction procedure of the pipeline connection structure according to the third embodiment is the same as that of the second embodiment up to the step shown in FIG. 6A, the subsequent steps will be described with reference to FIG.

  As shown in FIG. 8, after the reducer 9 is connected to the end of the rehabilitation pipe 3, the connecting member 11 is attached between the reducers 9 and 9. The connecting member 11 used here has a branch pipe 111 protruding from the pipe wall surface, and an end of the branch pipe 111 is an opening 111a. The opening 111 a is disposed on the connection member 11 and can be freely opened and closed by the lid 12.

  One end of the connecting member 11 has an inner diameter that is substantially equal to the outer diameter of the end of the reducer 9 to be connected. For this reason, it becomes possible to insert and connect the said edge part of the connection member 11 to the outer surface of the reducer 9. FIG. In this configuration, the seal between the reducer 9 and the connecting member 11 is obtained by the seal member 13.

  The other end of the connecting member 11 has an outer diameter substantially the same as the end of the reducer 9 to be connected. Thereby, as described in the first and second embodiments, a connection structure using the rubber hose 8 can be obtained.

  In the third embodiment, the axial length of the connecting member 11 is shorter than the dimension between the reducers 9 and 9. As a result, a gap is formed between the reducer 9 and the connecting member 11, and the gap is sealed by the rubber hose 8 in a state where the gap is filled with a filling tube (for example, a vinyl chloride tube) 14. In this configuration, since the step on the inner surface of the tube is eliminated by the interlining tube 14, it is possible to suppress filth and the like from staying at the step.

  Alternatively, as illustrated in FIG. 9, the gap may be sealed only by the rubber hose 8 without using the interlining tube 14. In this case, as described in the second embodiment, the pipe connection structure can have earthquake resistance.

  As described above, the pipeline connection structure according to the third embodiment can be provided. In addition to the effects described in the first embodiment, the pipe connection structure can be easily maintained by using the connection member 11 having the opening 111a. Specifically, it is possible to perform high-pressure cleaning from the opening 111a with the lid 12 removed, or to conduct an internal investigation by placing a self-propelled TV camera in the tube. That is, maintenance management such as cleaning and investigation can be performed without dismantling the pipe connection structure.

[Embodiment 4]
Hereinafter, Embodiment 4 of the present invention will be described in detail with reference to the drawings. Since the construction procedure of the pipe connection structure according to the fourth embodiment is the same as that of the second embodiment up to the step shown in FIG. 6A, the subsequent steps will be described with reference to FIG.

  As shown in FIG. 10, after the reducer 9 is connected to the end portion of the rehabilitation pipe 3, the connecting member 11 is attached between the reducers 9 and 9. Here, one end of the connection member 11 is attached in the same manner as in the third embodiment. That is, the end of the connection member 11 is inserted into the outer surface of the reducer 9 and connected.

  The other end of the connection member 11 is connected to the reducer 9 using the exchange joint 15. In the exchange joint 15, one end of the exchange joint 15 has an inner diameter substantially equal to the outer diameter of the end of the connecting member 11 to be connected. For this reason, one end of the exchange joint 15 can slide in the axial direction with respect to the connection member 11 while the end of the exchange joint 15 is inserted and connected to the outer surface of the connection member 11. In this configuration, the seal between the exchange joint 15 and the connection member 11 is obtained by the seal member 13.

  The exchange joint 15 is attached to the connection member 11 before connecting one end of the connection member 11 to the reducer 9. At this time, the exchange joint 15 is inserted to the deepest position where it can be inserted into the connection member 11. Then, after one end of the connection member 11 is connected to the reducer 9, the exchange joint 15 is slid in the axial direction so that the end of the exchange joint 15 and the end of the reducer 9 connected thereto are brought into contact with each other. . The connection portion between the end portion of the exchange joint 15 and the end portion of the reducer 9 is covered with the rubber hose 8 from the outer surface side so that the connection portion is sealed. The method of attaching the rubber hose 8 is the same as that of the first embodiment.

  As described above, the pipe connection structure according to the fourth embodiment can be provided. In addition to the effects described in the first embodiment, this pipeline connection structure can achieve both the elimination of the step in the pipeline and the provision of earthquake resistance. That is, since the connection portion between the exchange joint 15 and the reducer 9 can be connected in a state where the end portions are in contact with each other, a step does not occur in this portion, and staying of dirt and the like can be suppressed. Further, at the connection portion between the exchange joint 15 and the connection member 11, the exchange joint 15 is slidable relative to the connection member 11 while sealing this portion. For this reason, even if relative displacement in the axial direction occurs between the connecting member 11 and the exchange joint 15 due to ground displacement during an earthquake, the displacement can be absorbed by the sliding movement, and the sealing performance in the pipe connection structure Can be maintained.

[Embodiment 5]
Hereinafter, Embodiment 5 of the present invention will be described in detail with reference to the drawings. In Embodiment 1-4 mentioned above, although the structure which connects rehabilitation pipes was demonstrated, as for the pipe line connection structure which concerns on this Embodiment 5, the existing pipe | tube (for example, the other side does not comprise) This is applicable to the case of a VU tube.

  For example, as shown in FIG. 11, when one of the pipes to be connected is an existing pipe 2 made of a VU pipe, the end of the existing pipe 2 is one like the rehabilitation pipe 3 in the first to fourth embodiments. Partial cutting is removed. And the same construction can be performed by fitting the pipe opening member 5 which consists of a single pipe | tube of a VU pipe | tube in the part.

  That is, the other of the pipes to be connected is the rehabilitation pipe 3 as in the first to fourth embodiments. On the side of the rehabilitation pipe 3, the reducer 9 is connected after the end is cut off. This reducer 9 is used to match the diameters of the existing pipe 2 and the rehabilitated pipe 3 to be connected. A connecting member 10 is attached between the tube port member 5 and the reducer 9. As the connection member 10, a general-purpose VU pipe having the same diameter as the existing pipe 2 and the pipe port member 5 is used. Moreover, the connection part of the existing pipe 2 and the pipe port member 5 seals this connection part by the inner surface band 6 being crimped | bonded from the inner surface side. Moreover, although the connection part of the connection member 10 and the pipe port member 5, and the connection part of the connection member 10 and the reducer 9 are sealed with the rubber hose 8, this structure is also the same as Embodiment 1-4 mentioned above. It is.

  Embodiments 1 to 5 described above are examples of one inflow pipe into the manhole and one outflow pipe. However, the present invention is not limited to this, and there are two inflow pipes and outflow pipes. It can be applied to the case where the tube is one place. That is, in such a case, a similar effect can be obtained by using a three-pronged connecting member.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Manhole 2 Existing pipe 3 Rehabilitation pipe 4 Invert 5 Pipe port member 6 Inner surface band 7 Connection member 8 Rubber hose 9 Reducer (Pipe port member, reducer joint)
DESCRIPTION OF SYMBOLS 10 Connection member 11 Connection member 111a Opening part 14 Filling tube 15 Exchange joint

Claims (10)

A pipe connection structure for connecting a rehabilitated pipe lined in an existing pipe to another pipe through a manhole,
The end of the rehabilitation pipe is excised so as to be in a state of being retracted to the inner side of the existing pipe from the inner wall of the manhole,
One end has substantially the same outer diameter as the rehabilitated tube, and the one end is inserted into the existing tube at a portion where the rehabilitated tube is cut, and is abutted with the end of the rehabilitated tube, and A tube member arranged so that the other end protrudes to the inner side of the manhole from the inner wall of the manhole;
An inner surface band that is crimped from the inner surface side to a connection portion between the end portion of the rehabilitated pipe and the end portion of the tube opening member that are butted, and seals the connection portion;
A pipe connection structure comprising: a pipe connecting member that connects the pipe port member and the other pipe. The pipe connection structure according to claim 1,
At least one of the pipe opening members is a reducer joint in which one end portion has the same outer diameter as the rehabilitation pipe and the other end portion has a larger outer diameter than the rehabilitation pipe. Pipe connection structure. The pipe connection structure according to claim 1 or 2,
The pipe connection structure according to claim 1, wherein an opening is provided in an upper part of the connection member. The pipe connection structure according to any one of claims 1 to 3,
The connection member is connected to at least one of the pipe port members via a rubber member, and a gap is provided between the connection member and the pipe port member at a connection location via the rubber member. Pipe connection structure. The pipe connection structure according to any one of claims 1 to 3,
The connecting member is connected to at least one of the tube port member via a rubber member, and a connecting tube is disposed between the connection member and the tube port member at a connection location via the rubber member, A pipeline connection structure characterized in that a step on the inner surface between the connection member and the pipe opening member is eliminated. The pipe connection structure according to any one of claims 1 to 3,
The pipe connection structure, wherein the connection member is connected to at least one of the pipe port members via an exchange joint whose one end is slidable in the axial direction. The pipe connection structure according to any one of claims 1 to 6,
The pipe connection structure according to claim 1, wherein the inner surface band has a seal length that allows an amount of slippage that may occur due to an earthquake. A pipe connection method for connecting a rehabilitated pipe lined in an existing pipe to another pipe through a manhole,
Cutting the end portion of the rehabilitated tube and retreating the end portion of the rehabilitated tube to the inner side of the existing tube from the inner wall of the manhole;
Inserting into the existing pipe a tube member having an end portion having substantially the same outer diameter as the rehabilitated tube, one end of the tube member and the end of the rehabilitated tube are abutted, and the other A step of disposing the tube member so that the end protrudes to the inner side of the manhole from the inner wall of the manhole;
A step of pressure-bonding an inner band provided with a cylindrical elastic body from the inner surface side to a connection portion between the end portion of the rehabilitated tube and the end portion of the tube opening member that are abutted, and sealing,
Connecting the pipe opening member to the other pipe using a connecting member. The pipe connection method according to claim 8,
The other pipe line is another rehabilitation pipe lined in another existing pipe,
On the other rehabilitation pipe side,
Cutting the rehabilitation pipe so that the end of the rehabilitation pipe is retracted to the inner side of the existing pipe from the inner wall of the manhole;
One end is inserted into the existing pipe at the portion where the rehabilitated tube is cut off and is abutted with the end of the rehabilitated pipe, and the other end protrudes to the inner side of the manhole from the inner wall of the manhole. A step of arranging the pipe member in
A step of crimping and sealing the inner surface band from the inner surface side so as to seal the connection portion between the end portion of the rehabilitated tube and the end portion of the tube opening member;
The pipe connection method, wherein the connection member connects the pipe opening members. The pipe connection method according to claim 8,
The other pipe line is another existing pipe that is not lined with a rehabilitation pipe,
On the other existing pipe side,
Cutting the end of the existing pipe so as to be in a state of being retracted to the inner side of the existing pipe from the inner wall of the manhole;
One end is inserted in a portion where the existing pipe is cut off and is abutted with the end of the existing pipe, and the other end projects beyond the manhole inner wall to the manhole inner side. A step of arranging
A step of crimping and sealing the inner surface band from the inner surface side so as to seal the connection portion between the end portion of the existing pipe and the end portion of the tube opening member,
The pipe connection method, wherein the connection member connects the pipe opening members.

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