JP2015190486A - Pipe connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reform an existing pipe to be reformed, perform a superior workability connection work against an existing pipe that has not been reformed yet or a new installing pipe, keep a high cut-off performance for a long period of time and prevent a damage of the reformed pipe.SOLUTION: A lining pipe 2 is inserted into an existing pipe to be reformed, a first cylindrical member is installed at the extremity end of the existing pipe and at the same time outwardly fitted in respect to the protruded lining pipe 2. The lining pipe 2 is heated and its diameter is expanded to cover the inner surface of the existing pipe and the inner surface of the first cylindrical member. The extremity end of the lining pipe 2 is cut and removed and the first cylindrical member is pulled out of the lining pipe 2. Then, a second cylindrical member 5 is installed and fixed at the extremity end of the lining pipe 2. Then, a coupler member 6 is fixed from the extremity end of the lining pipe 2 to the rear end of the pipe to be connected and the existing pipe and the adjoining pipe are connected through the coupler member 6.

Description

  The present invention relates to a pipe connection method for connecting a renovated pipe and a pipe adjacent thereto.

  In order to rehabilitate pipes that have deteriorated over time, a rehabilitation method is widely used in which a lining pipe made of a thermoplastic resin material such as vinyl chloride resin is used to coat the inner surface of the pipe line. As this type of rehabilitation method, using a lining pipe that is smaller in diameter than the inner diameter of the existing pipe and formed to recover the shape of the circular pipe at the shape memory temperature, the diameter is increased by heating in the existing pipe, There is a method to restore the shape of a circular tube. Then, the existing pipe is rehabilitated by bringing the expanded lining pipe into close contact with the inner peripheral surface of the existing pipe and curing it.

  When the object to be rehabilitated is a part of the existing pipe, it is necessary to connect the rehabilitated existing pipe and the adjacent existing pipe that is piped in the pipe axis direction. For example, as disclosed in Patent Document 1, when only a partial section of an existing pipe is rehabilitated, the existing pipe is cut and removed over a set length range, and then one existing pipe to be rehabilitated is lined. Rehabilitation is performed by a pipe, and then the rehabilitated pipe and an adjacent unrehabilitated existing pipe are connected via a pipe joint.

JP 2006-46592 A

  When connecting the end of an existing pipe to be rehabilitated and the end of an adjacent unrehabilitated existing pipe via a pipe joint, the lining pipe made of thermoplastic resin does not necessarily expand to a perfect circle. The outer diameter is difficult to be constant. For this reason, when connecting using a pipe joint, there was a possibility that a general-purpose pipe joint could not be attached to the end of the lining pipe extended from the existing pipe and expanded in diameter. Moreover, even if a pipe joint is mounted, measures from various viewpoints are required to ensure water-stopping between the lining pipe whose outer diameter is not stable and the existing pipe.

  Furthermore, if the strength of the lining pipe made of thermoplastic resin is small compared to the strength of the existing pipe, if the pipe joint is tightened according to the water pressure in the pipe, the lining pipe will not be able to withstand the tightening force and will buckle or crack. Etc. could cause.

  The present invention has been made in view of the circumstances as described above, and its purpose is to rehabilitate an existing pipe to be rehabilitated with a lining pipe, and an upstream or downstream pipe adjacent thereto, A pipe connection method is provided that connects the renovated pipe with sufficient accuracy while ensuring sufficient strength, water-stopping and durability of the connecting portion, and is excellent in workability.

  The solution means of the present invention for achieving the above object is based on a pipe connection method in which an existing pipe is lined and rehabilitated, and the existing pipe after rehabilitation and a pipe adjacent thereto are connected. As this pipe connection method, the lining pipe is inserted into the existing pipe to be rehabilitated, the lining pipe is projected beyond the tip of the existing pipe, and the short tubular first cylindrical member is installed at the tip of the existing pipe. A preparatory step for covering the projecting lining pipe, and a diameter expanding step for heating the lining pipe so as to cover the inner surface of the existing pipe and the inner surface of the first cylindrical member, and the lining. A step of cutting and removing a portion of the tube that protrudes beyond the tip of the first cylindrical member, and pulling the first cylindrical member away from the lining tube, and removing the second cylindrical member having a short tubular shape; A fixing step of attaching to and fixing to the tip of the. And it is set as the structure which attaches a joint member from the front-end | tip part of the said lining pipe to the rear-end part of the pipe | tube of a connection destination, and connects the said existing pipe and the adjacent pipe | tube through the said joint member.

  By such a pipe connection method, the lining pipe projecting from the tip of the existing pipe can be formed into a cylindrical shape similar to the upstream or downstream pipe adjacent in the pipe axis direction, via the joint member. It can be securely connected. In addition, the short cylindrical second cylindrical member can be attached to the tip of the lining pipe to reinforce the pipe end, and buckling or deformation at the tip of the lining pipe can be prevented. As a result, the existing pipe after the rehabilitation and the connection destination pipe are connected with high accuracy to form one continuous flow path, and the fluid can be smoothly guided from the upstream side to the downstream side.

  Specific examples of the pipe connection method include the following.

  That is, in the fixing step, it is preferable that the second cylindrical member is fixed to the lining pipe in a state where an expansion / contraction margin of the lining pipe is provided between the leading end portion of the existing pipe and the rear end portion of the second cylindrical member. .

  Depending on the temperature of the fluid flowing through the rehabilitated pipe line, the lining pipe may be affected to cause thermal expansion and contraction. On the other hand, the expansion / contraction margin provided on the lining pipe by the above configuration allows thermal expansion / contraction of the lining pipe. Therefore, the second cylindrical member and the tip of the existing pipe can be prevented from interfering with each other, and damage to the lining pipe can be prevented.

  In this case, it is preferable to fill the outer surface of the stretchable margin with a stretchable member. Thereby, while allowing thermal expansion and contraction at the expansion and contraction portion, the space between the existing pipe and the lining pipe is filled to prevent the intrusion of fluid. As a result, it is possible to improve water-tightness and airtightness at the connection portion between the existing pipe after rehabilitation and the pipe adjacent thereto, and to form an integrally continuous smooth flow path.

  In the pipe connection method, the first cylindrical member has an inner diameter corresponding to the inner diameter of the existing pipe, and in the diameter expansion step, the lining pipe is expanded to have an outer diameter corresponding to the inner diameter of the existing pipe. It is preferable.

  Thereby, the outer diameter of the lining pipe which expands is regulated by the first cylindrical member, and the lining pipe is easily formed into a cylindrical shape having an outer diameter corresponding to the inner diameter of the existing pipe.

  Alternatively, in the pipe connection method, the first cylindrical member has an inner diameter corresponding to the outer diameter of the existing pipe, and in the diameter expansion step, the lining pipe has an outer diameter corresponding to the outer diameter of the existing pipe. The diameter may be increased.

  Also in this case, the outer diameter of the lining pipe to be expanded is restricted by the first cylindrical member, and the lining pipe is easily formed into a cylindrical shape having an outer diameter corresponding to the outer diameter of the existing pipe.

  In the pipe connection method, when the lining pipe is expanded to have an outer diameter corresponding to the inner diameter of the existing pipe, in the fixing step, an adhesive is applied to the inner peripheral surface of the second cylindrical member, It is preferable that the second cylindrical member is fitted and adhered to the outer peripheral surface of the distal end portion of the lining pipe.

  As a result, the lining pipe is held by the second cylindrical member from the outer surface side at the tip of the existing pipe, and thermal expansion and contraction of the lining pipe can be suppressed.

  Further, when the lining pipe is expanded to have an outer diameter corresponding to the outer diameter of the existing pipe, in the fixing step, an adhesive is applied to the outer peripheral surface of the second cylindrical member, It is preferable that the two cylindrical members are fitted and bonded to the inner peripheral surface of the tip portion of the lining pipe.

  Also by this, the lining pipe is held by the second cylindrical member from the inner surface side at the tip of the existing pipe, and thermal expansion and contraction of the lining pipe can be suppressed.

  More specifically, the second cylindrical member is a metal cylindrical reinforcing core, and after being fitted into the tip of the lining pipe, the pipe end of the lining pipe is heated and softened to form the second cylindrical member. It is preferable to integrate the lining pipe with the cylindrical member.

  By softening the lining pipe in this way, the lining pipe contracts during cooling and comes into close contact with the second cylindrical member, so that the gap between the lining pipe and the second cylindrical member can be eliminated.

  Furthermore, it is preferable to heat and soften the tube end of the lining tube prior to inserting the second cylindrical member into the lining tube.

  Thus, the second cylindrical member can be fitted and inserted into the lining tube smoothly and easily without interference between the second cylindrical member and the lining tube.

  Further, in the pipe connection method, the joint member may be externally connected including the lining pipe and the second cylindrical member from the tip of the renovated existing pipe to the rear end of the connection destination pipe. preferable.

  As a result, the tip of the existing pipe and the second cylindrical member, the second cylindrical member and the lining pipe, and the rear end of the lining pipe and the connection destination pipe are integrally covered via the joint member, so that A pipe line having a water-stopping property can be formed.

  According to the present invention, an existing pipe to be rehabilitated is rehabilitated, and the rehabilitated pipe protruding from the tip by a set length is reliably sealed against an unrehabilitated existing pipe or a new pipe adjacent to the pipe axis direction. Can be connected with good workability.

It is explanatory drawing which shows the pipe connection method which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the drainage pipe before starting a series of operation | work in the said pipe connection method. It is explanatory drawing which shows 1 process of the said pipe | tube connection method. It is explanatory drawing which shows the post process of FIG. It is explanatory drawing which shows the post process of FIG. It is explanatory drawing which shows the post process of FIG. It is a side view which shows the drainage pipe after the completion of connection. It is explanatory drawing which shows the connection principal part of FIG. 7 with a half cross section. It is explanatory drawing which shows the connection principal part in the pipe | tube connection method which concerns on Embodiment 2 of this invention with a half cross section. It is explanatory drawing which shows the pipe connection method which concerns on Embodiment 3 of this invention with a half cross section. It is explanatory drawing which shows 1 process of the said pipe | tube connection method. It is explanatory drawing which shows the post process of FIG. It is explanatory drawing which shows the post process of FIG. It is explanatory drawing which shows the post process of FIG. It is explanatory drawing which shows the other form of the post process of FIG. It is explanatory drawing which shows the further another form of the post process of FIG.

  A pipe connection method according to an embodiment of the present invention will be described with reference to the drawings. In the following description, as an example of the pipe connection method according to the present invention, a case where the present invention is applied to a drainage facility in an apartment house such as an apartment will be described as an example.

(Embodiment 1)
FIG. 1 is an explanatory diagram showing a drainage pipe 1 connected by the pipe connection method according to the first embodiment.

  The drainage pipe 1 is piped in the vertical direction through a pipe shaft provided through the upper and lower floors and through a concrete slab separating the upper floor and the lower floor in an apartment house such as an apartment. . Long-term use of buildings may require repairs to existing pipes such as fresh drainage pipes 1 in addition to repairing major structural parts such as outer walls. In such a case, instead of replacing the existing pipes that are stored in the pipe shaft or embedded in the structural frame with new pipes, identify the locations that need repair, as described below. Rehabilitate part of existing pipes. As a result, the construction period required for repair can be shortened and the cost can be greatly reduced, resulting in a great merit.

  2-8 is explanatory drawing which shows each process of the pipe | tube connection method which concerns on Embodiment 1. FIG.

  In the illustrated embodiment, the downstream side of the drainage pipe 1 shown in FIG. 2 is a rehabilitation target pipe line, and the upstream side is a pipe line that does not need to be rehabilitated. A pipe connection method for lining and rehabilitating the downstream side pipe line 11 and connecting the downstream side pipe line 11 and the existing upstream side pipe line 12 after the rehabilitation will be described.

  As shown in FIG. 2, when performing the renewal operation of the drainage pipe 1, the drainage pipe 1 is partially cut and removed by a set length in the upper part of the downstream pipeline 11 to be rehabilitated. Thereby, the space for the lining operation | work of the downstream pipe line 11 is provided.

  Next, as shown in FIG. 3, the lining pipe 2 is inserted into the downstream pipe line 11 to be rehabilitated. The lining pipe 2 is made of a thermoplastic resin such as vinyl chloride or high-density polyethylene, and has a cross-sectional shape that is degenerated into a bowl shape. For example, the lining pipe 2 is formed in a shape having a recess 21 along the longitudinal direction as shown in FIG. 3 by extruding a cylindrical body of a thermoplastic resin material and crushing the outer surface in an atmosphere of a shape memory temperature. ing. The lining pipe 2 has a performance of restoring its shape to the original cylindrical body by being heated to a predetermined shape memory temperature (for example, 80 ° C.). It is preferable that the lining pipe 2 is heated before being drawn in to reduce the rigidity of the lining pipe 2 so as to be easily drawn into the downstream side pipe line 11 (preheating step).

  The lining pipe 2 is drawn into the downstream side pipe line 11 and arranged so that the tip part protrudes from the upper end of the downstream side pipe line 11. Next, the first cylindrical member 3 is installed at the upper end of the downstream side pipe 11, and the first cylindrical member 3 is externally mounted on the protruding lining pipe 2 (preparation step).

  The first cylindrical member 3 is a short tubular cylindrical body, and has an inner diameter corresponding to the inner diameter of the downstream side pipe line 11. Further, the first cylindrical member 3 has an axial length corresponding to the set length of the lining pipe 2 that protrudes from the downstream pipe line 11 to be rehabilitated. The first cylindrical member 3 may be a short pipe having flanges at both ends. The material of the first cylindrical member 3 is preferably a stainless steel pipe excellent in corrosion resistance, heat resistance, heat retention and workability. Such a first cylindrical member 3 is installed at the upper end portion of the downstream pipe line 11 so that the axial center thereof coincides with the axial center of the upstream pipe line 12.

  Next, as shown in FIG. 4, a closing plug 4 is attached to the upper end portion of the lining pipe 2 to close the lining pipe 2. A heating medium such as high-temperature steam is supplied into the lining pipe 2 from a downstream end side of the lining pipe 2 through a supply pipe (not shown). The lining pipe 2 is heated and softened by the heating medium. Next, pressurized air as a pressurized fluid is supplied, the diameter of the softened lining pipe 2 is expanded, and the shape is restored to a cylindrical state (a diameter expansion step).

  Thereby, the lining pipe | tube 2 coat | covers and adhere | attaches the inner surface of the downstream pipe line 11. FIG. At the upper end of the downstream pipe 11, the lining pipe 2 is expanded so that the outer diameter is regulated by the first cylindrical member 3 and has an outer diameter corresponding to the inner diameter of the downstream pipe 11.

  Next, as shown in FIG. 5, the portion of the lining pipe 2 that has expanded and protruded beyond the tip of the first cylindrical member 3 is cut and removed. Further, the first cylindrical member 3 is pulled out from the lining pipe and removed (removal process). In consideration of pulling out the first cylindrical member 3 from the upper end portion of the lining pipe 2, it is preferable to apply a release agent to the inner peripheral surface of the first cylindrical member 3 in advance to reduce the frictional force.

  Next, as shown in FIG. 6, the second tubular member 5 having a short tubular shape is attached and fixed to the distal end portion of the lining pipe 2 (fixing step). The second cylindrical member 5 is a short tubular cylindrical body having a tube diameter equivalent to that of the first cylindrical member 3, and the axial length is shorter than that of the first cylindrical member 3. The second cylindrical member 5 is not limited to a stainless steel pipe as long as it is a short pipe made of a material excellent in corrosion resistance, heat resistance, heat retention, and workability, and may be a hard polyvinyl chloride pipe or the like. Good. An adhesive is applied to the inner peripheral surface of the second cylindrical member 5, and is fitted into the tip of the lining pipe 2 to be bonded.

  By fixing the second cylindrical member 5 to the upper end portion of the lining pipe 2, the upper end portion of the lining pipe 2 protruding beyond the upper end of the downstream pipe line 11 can be reinforced, and the buckling of the lining pipe 2 is performed. And deformation can be prevented. Further, the lining pipe 2 may be thermally expanded and contracted by being affected by the temperature of the drainage or the like that flows inside, but the second cylindrical member 5 expands or contracts while holding the outer surface of the lining pipe 2. To regulate.

  The upper end of the downstream pipe 11 and the lower end of the second cylindrical member 5 are not joined, and a clearance is provided between them, and the second cylindrical member 5 is inserted into the lining pipe 2. The clearance includes various conditions such as the pipe length of the downstream pipe 11, the linear expansion coefficient of the thermoplastic resin material constituting the lining pipe 2 and the stainless steel material constituting the second cylindrical member 5, and the temperature of the drained water flowing down. It is set in consideration and is generally in the range of 5 mm to 15 mm.

  For example, when the pipe length of the downstream pipeline 11 to be rehabilitated is 2 m, a clearance of 5 mm or more is required, but it is preferable to set the clearance to 10 mm by setting on the safe side. This clearance is used as an expansion / contraction margin 22 for allowing thermal expansion / contraction in the lining pipe 2 after use.

  The expansion / contraction margin 22 is formed in an annular shape on the outer surface of the lining pipe 2 as a recess between the upper end of the downstream pipe 11 and the lower end of the second cylindrical member 5. As shown in FIG. 1, a stretchable member 23 is filled in the recess formed by the stretchable margin 22. The stretchable member 23 is made of a highly stretchable material such as silicon sealant, and preferably has high stretchability (elasticity). Further, the stretchable member 23 is configured such that the lining pipe 2 is displaced or deformed relative to the pipe axis after construction, so that the upper end of the downstream pipe line 11 and the lower end of the second cylindrical member 5 are Even when the distance changes, it is preferable to have the performance of following the behavior of the lining pipe 2.

  Next, the joint member 6 is inserted into the downstream side pipe line 11 and the upstream side pipe line 12 to prepare. In addition, a new connection pipe 8 is disposed between the downstream side pipe line 11 and the upstream side pipe line 12. As shown in FIG. 1, it is preferable to provide a clearance equivalent to that of the expansion / contraction margin 22 between the new connection pipe 8 and the second cylindrical member 5. The new connection pipe 8 has a pipe diameter equivalent to the pipe diameter of the upstream pipe line 12, and its axial center is arranged so as to coincide with the axial center of the upstream pipe line 12.

  Thereafter, the joint member 6 inserted into the downstream side pipe 11 is moved upward and attached integrally from the upper end of the downstream side pipe 11 to the lower end of the connecting pipe 8. That is, the joint member 6 including the lining pipe 2 and the second cylindrical member 5 is attached to the outer surfaces of the downstream side pipe line 11 and the connection pipe 8.

  Further, the joint member 6 inserted through the upstream pipe 12 is moved downward and attached integrally from the lower end of the upstream pipe 12 to the upper end of the new connection pipe 8.

  As the joint member 6, a general-purpose pipe joint can be used. For example, the joint member 6 as shown in FIGS. 7 and 8 is preferable. This type of joint member 6 connects the downstream side pipe line 11 and the new connection pipe 8 with a joint body 61, and a receiving portion 611 having flanges at both ends in the axial direction of the joint body 61. The outer diameter of the pipe to be formed and connected is set larger. The central portion of the joint body 61 in the axial direction has a wide space inside. The joint member 6 includes two sets of a flange portion 62 and a sealing annular packing 63 which are separate from the joint body 61. The upper end portion of the downstream pipe 11 to be connected and the lower end portion of the connection pipe 8 are inserted into the joint body 61 from the receiving portion 611 and used.

  On the outer peripheral surface of the upper end portion of the downstream side pipe 11, the joint member 6 is prepared by being fitted in the order of the flange portion 62, the packing 63, and the joint body 61. On the outer peripheral surface of the lower end portion of the new connection pipe 8, the joint member 6 is prepared by being inserted from the lower side in the order of the flange portion 62 and the packing 63.

  The new connection pipe 8 is coaxially arranged above the downstream side pipe 11 and the joint body 61 attached to the downstream side pipe 11 is slid upward (see FIG. 1). And the coupling main body 61 is arrange | positioned so that the lower end part of the connection pipe 8 and the upper end part of the downstream pipe line 11 may be straddled.

  As shown in FIG. 8, the second cylindrical member 5 on the outer peripheral surface of the lining pipe 2 is housed in the joint body 61. The flange portion 62 and the packing 63 attached to the outer peripheral surface of the upper end portion of the downstream side pipe line 11 are pushed into the joint body 61 from below, and the flange portion 62 and the packing 63 attached to the connection pipe 8 are joined from above to the joint body 61. Push against. This push-in is performed by inserting a tightening bolt 64 through a bolt hole provided in each of the flange of the receiving portion 611 of the joint body 61 and the flange portion 62 and tightening with a nut 65.

  The lower annular packing 63 is pressed between the lower receiving portion 611 of the joint body 61 and the outer peripheral surface of the upper end portion of the downstream side pipe 11. The upper packing 63 is pressed between the upper receiving portion 611 of the joint body 61 and the outer peripheral surface of the lower end portion of the connecting pipe 8. Thereby, the downstream side pipe line 11 and the new connection pipe 8 are concentrically held, and the leakage of fluid from this connection part can be sealed. By the same procedure, the upper end portion of the new connection pipe 8 and the unregenerated upstream pipe line 12 are connected via the joint member 6. Thereby, the rehabilitated downstream pipe 11 and the unregenerated upstream pipe 12 are connected via the joint member 6.

  The upper end portion of the downstream pipe line 11 and the second cylindrical member 5 are disposed in the internal space of the joint body 61 of the joint member 6 without interfering with the inner wall of the joint body 61. For this reason, these pipe end portions can be displaced inside the joint body 61 and can be refracted with respect to the axis of the joint body 61. Therefore, even if thermal expansion and contraction occurs due to the influence of water temperature such as drained water flowing down, it is absorbed inside the joint member 6 and allowed at the expansion and contraction margin 22 of the lining pipe 2. Also, a certain amount of expansion and contraction is allowed for the tensile force acting in the tube axis direction.

  Since the stretchable member 23 is filled between the second cylindrical member 5 housed in the joint body 61 and the downstream pipe line 11, the behavior of the lining pipe 2 can be followed. Further, it is possible to prevent the fluid from entering between the outer surface of the lining pipe 2 and the downstream pipe line 11, and to completely prevent the fluid from leaking from the connection site.

  As described above, by connecting the existing pipe and the adjacent pipe through the joint member 6, the renewed lining pipe 2 in the downstream side pipe 11 does not bear the load of the pipe connected upward. Will be provided. For this reason, load supporting force is not requested | required of the lining pipe 2, and there exists no possibility of a deformation | transformation, damage, etc. by external force. In addition, since the thermal expansion / contraction of the lining pipe 2 is allowed by the expansion / contraction margin 22 provided in the lining pipe 2, the drainage fresh pipe 1 after rehabilitation can be used well over a long period of time.

(Embodiment 2)
FIG. 9 is an explanatory view showing a connection main part of the drainage pipe 1 connected by the pipe connection method according to the second embodiment of the present invention in a half section.

  The pipe connection method according to this embodiment has features in the diameter expansion process and the fixing process, and other processes and constituent members such as the lining pipe 2, the connection pipe 8, and the joint member 6 are the same as those in the first embodiment. It is the same as that shown in. Therefore, in the following description, the characteristic configuration of the diameter expansion process and the fixing process will be described in detail, and the detailed description of other configurations will be omitted using the same reference numerals as those in the first embodiment.

  In the diameter expansion process of the lining pipe 2, the first cylindrical member 3 having an inner diameter corresponding to the outer diameter of the downstream side pipe line 11 is used. The first cylindrical member 3 is installed so that its axis coincides with the axis of the upstream pipe line 12, and the diameter of the lining pipe 2 is expanded by the same procedure as in the first embodiment. The heated and pressurized lining tube 2 is softened, expanded in diameter, and restored to a cylindrical shape.

  Since the first cylindrical member 3 has an inner diameter corresponding to the outer diameter of the downstream pipe line 11, the outer diameter of the lining pipe 2 is regulated by the first cylindrical member 3, and the upper end portion of the downstream pipe line 11. The diameter is expanded from the outside. As a result, the diameter of the lining pipe 2 is increased so as to have an outer diameter corresponding to the outer diameter of the downstream side pipe line 11.

  Next, the portion of the lining tube 2 that has expanded and protruded beyond the tip of the first cylindrical member 3 is cut and removed, and the first cylindrical member 3 is pulled out of the lining tube and removed (removal step).

  Next, the second tubular member 5 having a short tubular shape is attached and fixed to the tip of the lining pipe 2 (fixing step). In this case, the second cylindrical member 5 is shorter in the axial direction than the first cylindrical member 3 and has an outer diameter equal to or slightly smaller than the inner diameter of the lining pipe 2. The second cylindrical member 5 is a short pipe made of a material excellent in corrosion resistance, heat resistance, heat retention and workability, and is preferably a stainless steel pipe or a hard polyvinyl chloride pipe.

  In this fixing step, an adhesive is applied to the outer peripheral surface of the second cylindrical member 5, inserted into the upper end portion of the lining pipe 2, and bonded to the inner peripheral surface of the lining pipe 2. In addition, the second cylindrical member 5 is fixed to the lining pipe 2 in a state where the expansion margin 22 of the lining pipe 2 is provided between the upper end portion of the downstream side pipe line 11 and the lower end portion of the second cylindrical member 5. .

  As a result, as shown in FIG. 9, the second cylindrical member 5 is bonded to the inner peripheral surface of the lining pipe 2 whose diameter has been expanded beyond the upper end portion of the downstream pipe line 11, and the inner surface is regulated. By fixing the second cylindrical member 5 to the upper end portion of the lining pipe 2 in this way, the upper end portion of the lining pipe 2 that protrudes beyond the upper end of the downstream side pipe line 11 can be reinforced from the inside. The buckling or deformation of the tube 2 can be prevented. In addition, the lining pipe 2 may be thermally expanded and contracted by being affected by the temperature of the drainage or the like flowing inside, but the second cylindrical member 5 expands or contracts while holding the inner surface of the lining pipe 2. To regulate.

  Thereafter, similarly to the first embodiment, the downstream pipe 11 and the new connection pipe 8 are connected via the joint member 6, and the new connection pipe 8 and the upstream pipe 12 are connected. Even with the connection method according to this embodiment, the lining pipe 2 inside the renovated downstream side pipe line 11 is provided without bearing the load of the pipe connected upward. For this reason, load supporting force is not required for the lining pipe 2, and there is no fear of deformation or breakage due to external force. In addition, since the thermal expansion / contraction of the lining pipe 2 is allowed by the expansion / contraction margin 22 of the lining pipe 2, the drainage fresh pipe 1 after the rehabilitation can be used well over a long period of time.

(Embodiment 3)
FIG. 10 is an explanatory view showing a drainage pipe connected by the pipe connection method according to the third embodiment of the present invention, and FIGS. 11 to 16 are diagrams showing respective steps of the pipe connection method according to the third embodiment. FIG.

  In the pipe connection method according to this embodiment, the configurations of the first cylindrical member 3, the second cylindrical member 5, and the joint member 7 used for connection are different from those of the above embodiment. Other processes and components such as the lining pipe 2 are the same as those shown in the first embodiment. Therefore, in the following description, the diameter expansion process, the fixing process, and the configuration of the joint member 7 will be described in detail, and the other configurations will be omitted using the same reference numerals as those in the first embodiment.

  The first cylindrical member 3 is made of a cylindrical stainless steel pipe or a cylindrical stainless steel pipe having flanges at both ends. Further, the first cylindrical member 3 has the same diameter as the outer diameter of the unrehabilitated upstream pipe 12 or a slightly larger inner diameter, and the lining pipe 2 that protrudes from the downstream pipe 11. Is formed with an axial length corresponding to the set length.

  As shown in FIG. 11, the first cylindrical member 3 is inserted into the outer surface of the upper end portion of the downstream side pipe line 11 and arranged outside the lining pipe 2. Next, as shown in FIG. 12, a stopper plug 4 is attached to the end of the lining pipe 2, and a heating medium such as high-temperature steam and a pressurized fluid are sequentially supplied from the downstream end side to expand the diameter of the lining pipe 2. Let Thereby, the lining pipe | tube 2 is closely_contact | adhered to the inner surface of the downstream pipe line 11, and the internal peripheral surface of the 1st cylindrical member 3 (diameter expansion process).

  Thereafter, the lining pipe 2 is cooled, and is cured in a state where the lining pipe 2 is in close contact with the inner peripheral surface of the downstream pipe line 11 to be rehabilitated and the inner peripheral surface of the first cylindrical member 3, and the shape is maintained. . The lining pipe 2 is expanded so as to have an outer diameter corresponding to the outer diameter of the downstream pipe line 11.

  Next, the lining pipe 2 is cut along the distal end portion of the first cylindrical member 3. Moreover, as shown in FIG. 13, the 1st cylindrical member 3 is pulled out from the lining pipe | tube 2 (removal process). At this time, it is preferable to reduce the frictional force by previously applying a release agent to the inner peripheral surface of the first cylindrical member 3.

  Next, as shown in FIG. 14, the second cylindrical member 5 is fitted and fixed to the inner surface side of the upper end portion of the expanded lining pipe 2 (fixing step). The second cylindrical member 5 is shorter in the axial direction than the first cylindrical member 3 and has an outer diameter that is equal to or slightly smaller than the inner diameter of the lining pipe 2. Moreover, the 2nd cylindrical member 5 is provided with the collar part in the upper end part.

  In this fixing step, an adhesive is applied to the outer peripheral surface of the second cylindrical member 5, inserted into the upper end portion of the lining pipe 2, and bonded to the inner peripheral surface of the lining pipe 2. In addition, the second cylindrical member 5 is fixed to the lining pipe 2 in a state where the expansion margin 22 of the lining pipe 2 is provided between the upper end portion of the downstream side pipe line 11 and the lower end portion of the second cylindrical member 5. .

  The second cylindrical member 5 is a short pipe made of a material excellent in corrosion resistance, heat resistance, heat retention, and workability, and is preferably a stainless steel pipe or a hard polyvinyl chloride pipe. In particular, when a stainless steel cylindrical member is used, the strength at the upper end of the lining pipe 2 can be significantly improved.

  As shown in FIG. 15A, a gap may be generated between the inner peripheral surface of the lining tube 2 and the outer peripheral surface of the second cylindrical member 5 due to a dimensional error in the thickness of the lining tube 2 or the like. is there. When the second cylindrical member 5 made of metal such as a stainless steel pipe is fitted and inserted, in order to eliminate such a gap, the second cylindrical member 5 is attached to the lining pipe 2 as shown in FIG. It is preferable to heat the tube end portion of the lining tube 2 with the heater 9 and soften it. The lining pipe 2 contracts in the subsequent cooling process and comes into close contact with the outer peripheral surface of the second cylindrical member 5. Various heaters such as a rubber heater, a band heater, and a belt heater can be used as the heater 9.

  Further, when the metal second cylindrical member 5 is inserted into the lining pipe 2, the second cylindrical member 5 interferes with the lining pipe 2 due to a dimensional error in the thickness of the lining pipe 2 and the like. There are also things you can't do. In such a case, as shown in FIG. 16A, it is preferable to attach a heater 9 to the outer peripheral surface of the upper end portion of the lining pipe 2 and heat the lining pipe 2 with the heater 9 to be softened. As a result, as shown in FIG. 16B, the second cylindrical member 5 can be pushed into and fixed to the upper end portion of the lining pipe 2.

  The strength of the upper end portion of the lining pipe 2 can be supplemented by the second cylindrical member 5. Further, when the lining pipe 2 and the upstream pipe line 12 are connected via the joint member 7, even if the joint member 7 is tightened with the set tightening force, buckling or deformation occurs in the lining pipe 2. There is nothing, and high water stop performance can be secured and connected.

  A joint member 7 is mounted and disposed in advance on the outer peripheral surface of the upstream pipeline 12. In the connection structure shown in FIG. 10, the downstream pipeline 11 to be rehabilitated and the unrehabilitated upstream pipeline 12 are connected via a joint member 7 called a coupling joint.

  This type of joint member 7 is attached to the butt joint portion of the pipe by reducing the diameter to connect the pipes together. As the joint member 7, for example, a strub coupling (registered trademark, manufactured by Showbond Co., Ltd.) or the like can be used.

  The joint member 7 is slid downward from the upstream pipe 12, and the lining pipe 2 is inserted into the lower end portion of the joint member 7. As shown in FIG. 10, the lower end of the upstream pipe 12 is fitted into the upper end of the joint member 7, and the joint member 7 is placed in a state where the ends of the upstream pipe 12 and the lining pipe 2 are butted together. Temporarily wear. Next, the two fastening bolts 71 of the joint member 7 are alternately tightened, and the diameter of the joint member 7 is reduced and fixed to the outer peripheral surfaces of both pipes. Thereby, the lining pipe 2 and the upstream pipe line 12 can be connected.

  As described above, the lining pipe 2 is formed in a perfect circle with an outer diameter corresponding to the inner diameter of the first cylindrical member 3, that is, an outer diameter corresponding to the outer diameter of the upstream-side pipe 12 at the connection destination. In addition, the inner surface of the lining pipe 2 is restricted by the second cylindrical member 5 and the strength is increased. Therefore, not only the upstream pipe 12 but also the outer peripheral surface of the upper end portion of the lining pipe 2 can be fastened with a uniform fastening force, and sufficient water stopping performance can be ensured. It can be securely fixed by preventing it from coming out.

  In addition, high external pressure and internal pressure act on the pipeline after rehabilitation, and internal and external pressure loads and unloading occur repeatedly, and thermal expansion and contraction of the lining pipe 2 due to the thermal effect of the flowing fluid occurs. The pipes connected by the pipe connection method configured as described above were subjected to internal and external pressure loading and unloading in consideration of thermal expansion and contraction of the lining pipe 2 at the connection site, and repeated fatigue tests were performed. The test conditions were such that the load displacement was set in the range of −1.1 mm to +2.2 mm in the tube axis direction, and the number of repetitions was 36,500 times corresponding to 50 years of service.

  As a result, damage such as cracks did not occur in the expansion / contraction margin 22 of the lining pipe 2, and damage such as cracks did not occur in the stretchable member 23. Therefore, it has been confirmed that the pipe connected by the pipe connection method according to the present invention can ensure good water-stopping properties for a long period of time at the connection site and can fully exhibit the performance of the lining pipe 2. It was.

  In the above description, the drainage pipe 1 is taken as an example of the pipe to be rehabilitated and connected, but the pipe to be connected is not particularly limited. For example, a water supply pipe, a horizontal branch pipe It can be applied to any pipes used for various purposes such as underground pipes and the like, such as water pipes and sewage pipes. Therefore, the present invention can be suitably used when connecting a lining and rehabilitated pipe, and an upstream or downstream pipe coaxially adjacent thereto, regardless of the direction of piping or the form of piping. it can. In addition to the sewer pipes, the rehabilitation method for rehabilitating a part of the existing pipes as described above can also be applied to water supply pipes, agricultural waterways, water supply pipes and drainage pipes for apartment houses, and bridge bridge pipes. .

  INDUSTRIAL APPLICABILITY The present invention can be suitably used as a method for connecting pipes in a pipe line that needs to be rehabilitated.

DESCRIPTION OF SYMBOLS 1 Drain pipe 11 Downstream side pipe 12 Upstream side pipe 2 Lining pipe 21 Recessed part 22 Stretch margin 23 Stretchable member 3 1st cylindrical member 4 Closure plug 5 2nd cylindrical member 6 Joint member 61 Joint main body 62 Flange Part 63 Packing 7 Joint member 71 Tightening bolt 8 New connection pipe 9 Heater

Claims (10)

A pipe connection method for lining and rehabilitating an existing pipe and connecting the existing pipe after the rehabilitation and a pipe adjacent thereto,
The lining pipe is inserted into the existing pipe to be rehabilitated, the lining pipe is protruded beyond the tip of the existing pipe, and the short cylindrical first cylindrical member is installed and protruded at the tip of the existing pipe A preparation process for sheathing the tube;
A diameter expansion step of heating the lining pipe and expanding the diameter so as to cover the inner surface of the existing pipe and the inner surface of the first cylindrical member;
Cutting and removing the portion of the lining tube that protrudes beyond the tip of the first cylindrical member, and removing the first cylindrical member by pulling it away from the lining tube;
A fixing step of attaching and fixing the second tubular member having a short tubular shape to the distal end portion of the lining pipe,
A pipe connecting method, comprising: attaching a joint member from at least a front end portion of the lining pipe to a rear end portion of a connection destination pipe, and connecting the existing pipe and an adjacent pipe via the joint member. The pipe connection method according to claim 1,
In the fixing step, the second cylindrical member is fixed to the lining pipe in a state where an expansion / contraction margin of the lining pipe is provided between the tip end portion of the existing pipe and the rear end portion of the second cylindrical member. Pipe connection method. The pipe connection method according to claim 2,
A pipe connecting method, wherein an outer surface of the expansion / contraction margin is filled with an elastic member. In the pipe connection method according to any one of claims 1 to 3,
The first cylindrical member has an inner diameter corresponding to an inner diameter of an existing pipe, and in the diameter expansion step, the lining pipe is expanded to have an outer diameter corresponding to the inner diameter of the existing pipe. Pipe connection method. In the pipe connection method according to any one of claims 1 to 3,
The first cylindrical member has an inner diameter corresponding to the outer diameter of the existing pipe, and in the diameter expanding step, the lining pipe is expanded to have an outer diameter corresponding to the outer diameter of the existing pipe. Pipe connection method. In the pipe connection method according to claim 4,
In the fixing step, an adhesive is applied to the inner peripheral surface of the second cylindrical member, and the second cylindrical member is inserted into and adhered to the outer peripheral surface of the distal end portion of the lining pipe. Pipe connection method. In the pipe connection method according to claim 5,
In the fixing step, an adhesive is applied to the outer peripheral surface of the second cylindrical member, and the second cylindrical member is inserted into and bonded to the inner peripheral surface of the tip of the lining pipe. Pipe connection method. In the pipe connection method according to claim 6 or 7,
The pipe connecting method, wherein the second cylindrical member is a metal cylindrical reinforcing core, and the pipe end of the lining pipe is heated and softened after being inserted into the tip of the lining pipe. In the pipe connection method according to claim 8,
Prior to fitting the second cylindrical member into the lining pipe, the pipe end portion of the lining pipe is heated and softened. In the pipe connection method according to any one of claims 1 to 9,
A pipe connection method, wherein the joint member is externally connected including the lining pipe and the second cylindrical member from the tip of the renovated existing pipe to the rear end of the connection destination pipe.

Images