JP2012135905A - Method of lining branch pipe and resin tube treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out lining of a branch pipe branched from a main pipe in a short period of time.SOLUTION: A resin pipe 10 is installed in the branch pipe 12 by reversing the inside surface and outside surface of the resin pipe 10 by high temperature high pressure air and is extended in the diameter direction of the branch pipe 12 while making the reversed part 10a advance to the branch pipe 12. Next, during the resin pipe 10 is softened by the high temperature, the projected part 10c of the resin pipe 10 to the main pipe 11 is folded at the root part. A through-hole 10e is formed in the folded projected part 10c to discharge air in the resin pipe 10 and to easily cool the resin pipe 10. After the resin pipe 10 is cooled and cured, the projected part 10c is cut while leaving the root part to form a flange part 10f and after that, the flange part 10f is fused to the inner surface of the main pipe 11.

Description

  The present invention relates to a branch pipe lining method in which a branch pipe branched from a main pipe is lined with a resin pipe made of a thermoplastic resin, and a resin pipe processing apparatus used for the lining of the branch pipe.

  Of pipe lines such as sewer pipes and gas pipes, it is generally known to repair or reinforce a branch pipe branched from a main pipe with a resin pipe made of a synthetic resin material. For example, in Patent Document 1, a resin tube which is made of a thermoplastic synthetic resin and is folded and closed at its distal end by a pull-in stopper at room temperature and hardened (rehabilitation tube) is heated and softened. Insert the branch pipe (attachment pipe) into the branch pipe from the side connected to the opposite side of the main pipe. It is described that after the installation of the resin pipe is completed, the folded resin pipe is spread with the pressure of the heated pressurized fluid and brought into close contact with the wall surface of the branch pipe, thereby lining the branch pipe with the resin pipe. Further, in Patent Document 1, after that, the protruding portion to the main pipe of the resin pipe, to which the pull-in stopper is attached, is cut leaving the root portion, and the remaining root portion is radially outside of the branch pipe. And forming a collar portion by bending.

JP 2003-159750 A

  Here, it is preferable to finish the lining of the branch pipe as quickly as possible. For example, when the pipeline is a sewer pipe and the lining work is performed so that water does not flow into the branch pipe, it is necessary to stop drainage from each household to the dredger connected to the branch pipe, When the pipe is a gas pipe, it is necessary to stop the gas, but there is a limit to the time during which drainage can be stopped and the time during which the gas can be stopped (for example, within one hour).

  On the other hand, in Patent Document 1, since the resin tube is installed on the branch pipe while being heated, and then the resin pipe is spread by a heated and pressurized fluid and brought into close contact with the wall of the branch pipe, the branch pipe is lined with the resin pipe. Immediately after, the resin tube is hot and softened. The resin tube is difficult to cut in a softened state.

  Therefore, after the above operation is completed, it is preferable to cut the protruding portion after the resin tube cools and hardens, but in this case, the resin tube is cooled and hardened without performing the operation. The amount of time you wait will increase your work time.

  Furthermore, after cutting off the cooled and hardened protruding portion, it is necessary to heat and soften the base portion of the resin tube again in order to bend the remaining root portion to form the collar portion, which also increases the work time. Will become longer.

  An object of the present invention is to provide a method for lining a branch pipe with a short working time, and a resin pipe processing apparatus used for the lining of such a branch pipe.

  A branch pipe lining method according to a first invention is a branch pipe lining method in which a resin pipe made of a thermoplastic synthetic resin is installed on a branch pipe branched from a main pipe, and the branch pipe is lined, The resin tube is heated and softened by a heated and pressurized fluid, and the softened resin tube is inserted into the branch pipe from the opposite side of the main pipe, and the inner surface and the outer surface of the resin tube are reversed. The tip portion on the main tube side protrudes from the main tube by advancing the inverted portion to the branch tube, and the non-inverted portion that closes the end portion on the main tube side remains. The resin pipe is expanded in the radial direction of the branch pipe by introducing a heated and pressurized fluid into the resin pipe, and the resin pipe is softened while the resin pipe is softened. The protruding part of the pipe to the main pipe is Folded radially outward of the pipe, substantially along the inner surface of the main pipe, and after the resin pipe has cooled and hardened, partially cut off the bent protruding portion, and the main pipe and the branch pipe It is characterized by forming a collar part covering the connection part.

  When the resin pipe is installed on the branch pipe by the so-called reversal method, leaving the non-inverted part that closes the tip on the main pipe side, the resin blocked by the non-inverted part after the resin pipe is installed on the branch pipe Since the heated and pressurized fluid remains inside the tube, it takes time for the resin tube to cool and harden.

  However, according to the present invention, while the resin tube is softened at a high temperature, the protruding portion is bent at its root portion, and after the resin tube is cooled and hardened, the bent protruding portion is partially cut. By forming the collar portion, it is possible to shorten the work time for lining the branch pipe with the resin pipe.

  In addition, the non-inverted portion remaining at the tip of the resin tube is connected to the inverted portion that forms the tip of the protruding portion, and a recess is formed at the boundary between the inverted portion and the non-inverted portion. As a reference, the apparatus for bending the protruding portion can be positioned. Also, if the part of the protruding part that forms the concave part is pushed out toward the inner surface of the main pipe while spreading in the radial direction of the resin pipe, the protruding part will be used as a fulcrum at the connection part of the branch pipe with the main pipe. Can be bent. Thereby, the protruding portion can be reliably bent at the root portion.

  A lining method for a branch pipe according to a second invention is the lining method for a branch pipe according to the first invention, wherein after the protruding portion is substantially along the inner surface of the main pipe, before the protruding portion is cut. The protruding portion is formed with a through-hole for discharging the heated and pressurized fluid inside the resin tube.

  By forming a through hole in the protruding portion and discharging the heated and pressurized fluid inside the resin tube, it is possible to shorten the time until the resin tube cools and hardens after the protruding portion is bent. Note that the through hole only needs to be able to discharge the heated and pressurized fluid inside the resin tube, and its position and the like do not require so high accuracy, so it is relatively easy to form even when the resin tube is softened at a high temperature. can do.

  A branch pipe lining method according to a third aspect of the present invention is the branch pipe lining method according to the first or second aspect of the invention, wherein the heated and pressurized fluid is supplied to the resin pipe so that the resin pipe is attached to the inner surface thereof. The reversing part of the resin pipe is advanced to the branch pipe by using a reversing machine that feeds out the outer surface and the outer surface, and the reversing machine has an unremoved portion of the resin pipe in the vicinity of the delivery port that feeds out the resin pipe. A heating device for heating the inverted portion is provided.

  According to the present invention, since the non-inverted portion of the resin tube immediately before being sent out from the delivery port is heated by the heating device, the inverted portion can be advanced to the branch tube while smoothly inverting the resin tube.

  A pipeline lining method according to a fourth aspect of the present invention is the branch pipe lining method according to any one of the first to third aspects of the invention, wherein the heated and pressurized fluid is supplied to the resin tube, thereby the resin tube. Using a reversing machine that feeds the inner surface and the outer surface while reversing, the reversing portion of the resin pipe is advanced to the branch pipe, and the reversing portion of the resin pipe is set when the resin pipe is installed in the branch pipe. Until the predetermined position in the middle of the branch pipe is reached, the heated and pressurized fluid is supplied from the reversing machine to the resin pipe, and after the reversal part of the resin pipe reaches the predetermined position, the reversal is performed. A pressurized fluid having a temperature lower than that of the heated pressurized fluid is supplied from a machine to the resin pipe.

  According to the present invention, after the reversal part of the resin pipe reaches a predetermined position in the middle of the branch pipe, the resin pipe is already reversed by the pressurized fluid supplied to the resin pipe from the reversing machine, and the branch pipe is already reversed. The part installed in can be cooled. Thereby, after installing the resin pipe in the branch pipe, the time until the resin pipe cools and hardens can be shortened.

  In this way, even when a pressurized fluid having a low temperature is supplied to the resin pipe from the middle of the resin pipe installed in the branch pipe, the high-temperature and high-pressure fluid that has been supplied until then is supplied to the inverted portion of the resin pipe. Since the inversion portion of the resin tube is heated by the high-temperature and high-pressure fluid, the resin tube does not become difficult to invert.

  A lining method for a branch pipe according to a fifth invention is the lining method for a branch pipe according to any one of the first to fourth inventions, wherein after forming the collar part, the collar part is formed on the inner surface of the main pipe. It is made to weld.

  According to the present invention, the gap between the resin tube and the inner surface of the main tube is reliably sealed by welding the formed flange to the inner surface of the main tube.

  A resin pipe bending apparatus according to a sixth invention is the resin pipe processing apparatus for bending the protruding portion of the resin pipe in the branch pipe lining method according to any one of the first to fifth inventions, wherein the non-inverted A spreading means for spreading the protruding portion in the radial direction of the branch pipe by biting into the portion, and a pressing means for pressing the protruding portion spread by the spreading means toward the inner surface of the main pipe It is characterized by having.

  According to the present invention, if the protruding portion is pressed toward the inner surface of the main pipe by the pressing means while the protruding portion is expanded in the radial direction of the resin pipe by the expanding means, The protruding portion can be bent with the connecting portion of the branch pipe to the main pipe as a fulcrum. Thereby, the protrusion part of the resin pipe installed in the branch pipe can be reliably bent in the root part.

  According to the present invention, while the resin tube is softened at a high temperature, the protruding portion is bent at its root portion, and then the resin tube is cooled and hardened, and then the bent protruding portion is partially cut. By forming the portion, the work time for lining the branch pipe with the resin pipe can be shortened.

  In addition, the non-inverted portion remaining at the tip of the resin tube is connected to the inverted portion that forms the tip of the protruding portion, and a recess is formed at the boundary between the inverted portion and the non-inverted portion. As a reference, the apparatus for bending the protruding portion can be positioned. Also, if the part of the protruding part that forms the concave part is pushed out toward the inner surface of the main pipe while spreading in the radial direction of the resin pipe, the protruding part will be used as a fulcrum at the connection part of the branch pipe with the main pipe. Can be bent. Thereby, the protruding portion can be reliably bent at the root portion.

In embodiment of this invention, it is a figure which shows the structure of the sewer pipe | tube immediately after installing the resin pipe in a branch pipe. It is a perspective view which shows the structure of the resin pipe which lines a branch pipe, (a) is the original state, (b) has shown the state deform | transformed so that it might become flat. It is a longitudinal cross-sectional view which shows the structure of a reversing machine. It is a figure which shows the procedure of the process with respect to the protrusion part to the main pipe of a resin pipe after installation of the resin pipe to a branch pipe. It is a figure equivalent to Drawing 4 (e) and (f) of modification 1.

  Hereinafter, preferred embodiments of the present invention will be described.

  First, a configuration of a sewer pipe including a branch pipe that performs lining in the present embodiment will be described. As shown in FIG. 1, the sewer pipe is a pipe line buried in the ground, and has a main pipe 11 and a branch pipe 12. The main pipe 11 is a pipe line that extends in a substantially horizontal direction between a plurality of manholes (not shown) and has a certain diameter (for example, a diameter of about 300 mm). The branch pipe 12 is a pipe branching from the main pipe 11 and having a diameter smaller than that of the main pipe 11 (for example, a diameter of about 150 to 200 mm). The main pipe 11 and the domestic basket 13 provided on the ground are connected to each other. Connected. A plurality of branch pipes 12 are connected to a portion of the main pipe 11 located between two manholes. And in this Embodiment, the branch pipe 12 is repaired or reinforced by lining the branch pipe 12 among the sewer pipes with the resin pipe 10 (resin pipe) demonstrated below.

  As shown in FIG. 2, the resin pipe 10 is made of a hard thermoplastic synthetic resin material such as polyvinyl chloride on the outer side of a cylindrical jacket 9 made of woven fabric such as polyester for both warp and weft, and is thicker than the jacket 9. A substantially cylindrical resin layer 8 having a large diameter is formed. The outer diameter of the resin layer 8 is about 145 mm. The outer diameter of the resin layer 8 expands when installed on the branch pipe 12 as described later, and is formed on the inner surface of the branch pipe 12. The diameter is such that it is in close contact (about 150 mm). In addition, the resin pipe 10 of FIG. 2 has shown the state before inversion so that it may mention later.

  Further, as shown in FIG. 1, a control belt 15 is attached to one end of the resin pipe 10. As will be described later, the control belt 15 is used to apply tension to a reversal portion 10a (described later) of the resin pipe 10 when the resin pipe 10 is installed on the branch pipe 12 while being reversed.

  And before such resin pipe 10 is installed in the branch pipe 12, as shown in FIG.2 (b), in the state deform | transformed so that it may become flat, the inversion machine as shown in FIG. 14.

  The reversing machine 14 is a device that sends out the resin pipe 10 from a delivery port 14a provided at the left end portion of FIG. 3 while reversing the inner surface and the outer surface thereof, and includes a pipe housing part 16, a pipe fixing part 17, and a heater 18. Guide rollers 19a and 19b are provided. The pipe accommodating portion 16 accommodates the resin pipe 10 deformed so as to be flat as described above in a wound state, and is supplied with high-pressure air from an air supply source (not shown). The pipe fixing part 17 is provided in the vicinity of the delivery port 14a, and the end of the resin pipe 10 opposite to where the control belt 15 is attached is fixed to the pipe fixing part 17. In addition, since the structure of the pipe accommodating part 16 and the pipe fixing | fixed part 17, and how to attach the resin pipe 10 to the pipe fixing | fixed part 17 are the same as before (for example, refer Unexamined-Japanese-Patent No. 55-145572 etc.). Here, further detailed description is omitted.

  The heater 18 (heating device) is arranged in the vicinity of the upper and lower sides in the vicinity of the delivery port 14a, and the resin pipe 10 is sent out from the delivery port 14a through the space between the vertically opposed heaters 18. The heater 18 heats the non-inverted portion of the resin pipe 10 located in the vicinity of the delivery port 14a and the air supplied to the reversing machine 14 in the vicinity of the pipe housing portion 16 and the delivery port 14a. In FIG. 3, the resin pipe 10 passing between the opposed heaters 18 is in contact with the heater 18, but the heater 18 and the resin pipe 10 may be in non-contact. Instead of the heater 18, an infrared heating device or a heating device that performs heating with high-temperature steam may be used.

  The guide roller 19 a is disposed on the right side of the heater 18 in FIG. 3 so as to sandwich the resin pipe 10. The guide roller 19a guides the resin pipe 10 accommodated in the pipe accommodating portion 16 between the heaters 18 that are vertically opposed to each other. The guide roller 19b is disposed so as to sandwich the resin pipe 10 on the left side of the heater 18 in FIG. The guide roller 19b takes up the resin pipe 10 that has passed between the vertically opposing heaters 18 and guides it toward the delivery port 14a.

  The reversing machine 14 is supplied with high-temperature and high-pressure air (heated and pressurized fluid) from an air supply source (not shown). Thereby, the resin pipe 10 is heated to a temperature higher than the Vicat softening point and lower than the melting point (for example, about 70 ° C. to 130 ° C. in the case of polyvinyl chloride), and is heated by the pressure of the air. The resin pipe 10 is sent out from the delivery port 14a while reversing the inner surface and the outer surface in order from the end opposite to the side where the control belt 15 is attached. At this time, the resin pipe 10 is heated by the high-temperature and high-pressure air in the pipe housing portion 16 to a temperature at which the resin pipe 10 is softened (for example, about 100 ° C.), and the uninverted portion 10b immediately before being sent out from the delivery port 14a The heater 18 is heated to a higher temperature (for example, about 130 ° C.). In the reversing machine 14, the operation of reversing the resin pipe 10 from the delivery port 14a is the same as the conventional one (for example, see Japanese Patent Application Laid-Open No. 55-145572). The detailed explanation is omitted.

  Next, a procedure for lining the branch pipe 12 with the resin pipe 10 will be described. In the present embodiment, the branch pipe 12 is lined with the resin pipe 10 by a so-called reversal method as described below.

  In order to line the branch pipe 12 with the resin pipe 10, first, in the reversing machine 14, the resin pipe 10 is softened by the heat of the air by supplying high-temperature and high-pressure air to the resin pipe 10 accommodated therein. As shown in FIG. 1, the softened resin pipe 10 is made to have an inner surface and an outer surface in order from the end opposite to the side where the control belt 15 is attached. The reversal part 10a is inserted into the branch pipe 12 from the domestic basket 13 (on the side opposite to the main pipe 11) and advanced to the branch pipe 12, and the reversal part 10a is expanded in the radial direction of the branch pipe 12. As a result, the resin pipe 10 is installed on the branch pipe 12, the installed resin pipe 10 is in close contact with the wall surface of the branch pipe 12, and the branch pipe 12 is lined with the resin pipe 10.

  At this time, the resin pipe 10 is heated for a short time when the resin pipe 10 is heated with high-temperature and high-pressure air and the heater 18 by heating the resin pipe 10 in advance in the factory where it is manufactured or during transportation. The above temperature may be reached. Further, the resin pipe 10 is pulled by the control belt 15 in the direction opposite to the traveling direction, so that an appropriate tension is applied to the inverted portion of the resin pipe 10, and the inverted portion of the resin pipe 10 is subjected to the tension by the control belt 15. It proceeds through the branch pipe 12 at a corresponding speed.

  Further, at this time, in the present embodiment, until the reversing portion 10a of the resin pipe 10 reaches a predetermined position in the middle of the branch pipe 12 (for example, an intermediate point of the branch pipe 12), By supplying air and driving the heater 18, high-temperature and high-pressure air is supplied to the resin pipe 10. After the reversal portion 10 a of the resin pipe 10 reaches the predetermined position, the reversing machine is supplied with room-temperature and high-pressure air. And the heater 18 is turned off to supply high-pressure air having a lower temperature (for example, normal temperature) to the resin pipe 10 than before.

  At this time, the tip of the resin pipe 10 on the main pipe 11 side is closed by the non-inverted portion 10b connected to the inverted portion 10a, so that the air is prevented from leaking from the tip of the resin pipe 10. ing. As a result, air pressure is reliably applied to the resin pipe 10, and the inversion portion 10 a of the resin pipe 10 reliably advances the branch pipe 12 and spreads in the radial direction of the branch pipe 12.

  As shown in FIG. 1, the resin pipe 10 installed in the branch pipe 12 has a leading end on the main pipe 11 side that protrudes into the main pipe 11, and a protruding part 10 c hangs down from the branch pipe 12. Yes. In addition, the resin pipe 10 is longer than the branch pipe 12 and is pulled by the control belt 15 in the direction opposite to the traveling direction, so that when the resin pipe 10 is installed on the branch pipe 12, The tip portion is formed by the inverted portion 10a, and the non-inverted portion 10b is connected to the inverted portion 10a. That is, even when the installation of the resin pipe 10 to the branch pipe 12 is completed, the non-inverted portion 10 b remains in the resin pipe 10. And the front-end | tip part of the resin pipe 10 is obstruct | occluded by the non-inverted part 10b.

  Further, the protruding portion 10c is formed with a concave portion 10d at a boundary portion between the inverted portion 10a expanded in the radial direction of the branch pipe 12 by air pressure and the non-inverted portion 10b. It is located at the approximate center.

  Next, while the resin pipe 10 is softened at a high temperature (for example, before the resin pipe 10 is cooled and the temperature becomes lower than the Vicat softening point), the resin pipe 10 is shown in FIGS. As described above, using the bending device 20 (resin pipe processing device), the protruding portion 10c is bent outward in the radial direction of the resin pipe 10 at its root portion.

  The bending device 20 has a configuration in which a lifting device 22, a bending member 23, a camera 24, and the like are arranged on a carriage 21. The carriage 21 can move in the main pipe 11 by being self-propelled or pulled by a wire (not shown). The elevating device 22 is constituted by a cylinder or the like, and a bending member 23 is attached to the upper end portion thereof. The bending member 23 can be moved up and down by driving the lifting device 22.

  The bending member 23 includes a half crack pipe 23a and a convex portion 23b. The half-cracked pipe 23a is made of a metal material or the like, and is arranged at the upper end portion of the elevating device 22 so that the outer peripheral surface thereof is on the top. The convex part 23b is formed in the top part of the outer peripheral surface of the half cracked pipe 23a, and has a substantially hemispherical shape having a smaller diameter than the half cracked pipe 23a. In the present embodiment, the combination of the lifting mechanism 22 and the half cracked pipe 23a corresponds to the pressing means according to the present invention, and the combination of the lifting mechanism 22 and the convex portion 23b corresponds to the present invention. It corresponds to such a spreading means. The camera 24 is for confirming the position of the bending apparatus 20 on the ground or the like.

  In order to bend the protruding portion 10c to the radially outer side of the resin pipe 10 at the root portion by the bending device 20, first, referring to an image projected by the camera 24 as shown in FIG. By moving the carriage 21 to a position where the convex portion 23b faces the concave portion 10d of the protruding portion 10c, the folding device 20 is aligned with the protruding portion 10c.

  Next, the bending member 23 is raised by the elevating device 22, and the bending member 23 is pressed against the protruding portion 10c from below. Then, first, as shown in FIG. 4B, the convex portion 23b bites into the non-inverted portion 10b from the concave portion 10d, whereby the protruding portion 10c is pushed outward in the radial direction of the branch pipe 12. When the bending member 23 is further raised, as shown in FIG. 4 (c), the protruding portion 10c spread by the convex portion 23b is pressed toward the wall surface of the main pipe 11 by the half cracked pipe 23a. As a result, the protruding portion 10c is bent at the root portion to the outside in the radial direction of the branch pipe 12 with the joint C between the main pipe 11 and the branch pipe 12 as a fulcrum.

  Further, as shown in FIG. 4 (c), the resin pipe 10 that is blocked by the non-inverted portion 10b by the drilling device 25 is pressed against the wall surface of the main pipe 11 by the half cracked pipe 23a. A through hole 10e is formed in the portion 10c, and high-temperature air in the resin pipe 10 is discharged to the outside from the through hole 10e.

  More specifically, the punching device 25 is disposed at the right end portion of the carriage 21 of the bending device 20 in FIG. 4, provided at the lifting device 26 and the upper end portion of the lifting device 26, and lifted by the lifting device 26. And a needle 27 that can be moved.

  And the through-hole 10e is formed by raising the needle | hook 27 with the raising / lowering apparatus 26 in the state pressed toward the wall surface of the main pipe 11 by the half crack pipe 23a. A blade or the like may be provided in place of the needle 27.

  Thereafter, the resin pipe 10 is cooled over time, and the temperature thereof is lowered to a temperature lower than the Vicat softening point, and the protruding portion 10c is bent into the branch pipe 12 as shown in FIG. Cured with. At this time, as described above, the through hole 10e is formed in the protruding portion 10c, and the high-temperature air in the resin pipe 10 is discharged to the outside from the through hole 10e. Time to do can be shortened.

  Next, as shown in FIG. 4 (e), by using the cutting device 30, the bent protruding portion 10c of the cured resin pipe 10 is cut leaving the root portion thereof, so that the non-inverted portion 10b The closed end of the resin pipe 10 is opened to allow the main pipe 11 and the branch pipe 12 to communicate with each other and to form a flange 10f.

  The cutting device 30 includes a carriage 31, a head 32, a lifting device 33, a cutting blade 34, a camera 35, and the like. The carriage 31 can move within the main pipe 11 by being self-propelled or pulled by a wire (not shown). Further, the carriage 31 is provided with a substantially cylindrical support shaft 36 extending in the horizontal direction for supporting the head 32 on the right end surface in the drawing.

  The head 32 is supported by a support shaft 36, can move in the axial direction along the support shaft 36, and can swing about the support shaft 36. The lifting mechanism 33 is provided on the right end surface of the head 32 in the drawing. The elevating mechanism 33 is provided with a cutting blade 34 at its upper end, and the elevating mechanism 33 can be driven to raise and lower the cutting blade 34. The cutting blade 34 can be rotated by a motor or the like (not shown). The camera 35 is the same as the camera 24 and is used for confirming the position of the cutting device 30 and the direction of the cutting blade 34 on the ground or the like.

In order to cut the protruding portion 10c of the resin pipe 10 by the cutting device 30, first, the cutting device 30 is moved to the vicinity of the branch pipe 12 by moving the carriage 31 while referring to the image projected on the camera 35. At the same time, the carriage 31 is fixed to the main pipe 11 by a fixing mechanism (not shown). Next, while moving the head 32 along the support shaft 36 and swinging it around the support shaft 36, the cutting blade 34 is moved along a certain circumference of the protruding portion 10 c surrounding the branch pipe 12. The protruding portion 10c is cut leaving the root portion by moving the cutting blade 34 while rotating the cutting blade 34 and raising the cutting blade 34 by the lifting mechanism 33 in a state where the cutting blade 34 faces each point on the circumference. To do. Thereby, the root part of the remaining protruding part 10c becomes the flange part 10f.
It becomes.

  Next, the flange portion 10 f is welded to the inner surface of the main pipe 11 using the welding device 40.

  The welding device 40 is obtained by removing the bending member 23 and the punching device 25 from the bending device 20 and attaching a heater 41 instead. Then, as shown in FIG. 4 (f), the carriage 21 is moved to a position where the heater 41 faces the branch pipe 12 while referring to the image projected by the camera 24, and then the heater 41 is moved by the elevating device 22. , The flange portion 10f is pressed to the inner surface of the main pipe 11 while being heated to a temperature higher than the melting point, for example, and the flange portion 10f is welded to the wall surface of the main pipe 11.

  At this time, if the main pipe 11 is lined with a resin pipe made of the same thermoplastic synthetic resin material as the resin pipe 10 before the branch pipe 12 is lined with the resin pipe 10, the resin pipe 10 is It is easy to weld to the wall surface of the main pipe 11.

  Here, when the resin pipe 10 is installed in the branch pipe 12 by the reversal method as described above, and the end portion on the main pipe 11 side of the resin pipe 10 installed in the branch pipe 12 is blocked by the non-inverted portion 10b. The resin pipe 10 is heated until just before the installation on the branch pipe 12 is completed, and immediately after the installation on the branch pipe 12 is completed, high-temperature and high-pressure air remains in the interior thereof. It takes some time for the resin pipe 10 to cool and harden.

  However, in this embodiment, after the resin pipe 10 is installed on the branch pipe 12, the protruding portion 10c is bent while the resin pipe 10 is softened at a high temperature, and then the resin pipe 10 is cooled and cured. Since the protruding portion 10c is cut from the end, the protruding portion 10c can be bent until the resin pipe 10 is cooled and hardened, and the order of bending and cutting of the protruding portion 10c is reversed. Compared with, work time can be shortened.

  Further, since the protruding portion 10c is folded after the resin pipe 10 is installed on the branch pipe 12 and before the resin pipe 10 is cooled and hardened, the protruding portion 10c is heated again when the protruding portion 10c is bent. There is no need for softening, and this can also shorten the working time.

  Further, when the resin pipe 10 is installed in the branch pipe 12, high-temperature and high-pressure air is supplied to the resin pipe 10 halfway, and high-pressure air having a lower temperature than that is supplied from the middle. Therefore, the portion where the inversion of the resin pipe 10 is completed is cooled by the low temperature air. Thereby, time until the resin pipe 10 cools and hardens | cures can be shortened.

  Even if the temperature of the air supplied to the resin pipe 10 is lowered in the middle as described above, the high-temperature and high-pressure air that has been supplied so far exists in the inverted portion of the resin pipe 10. The inversion portion is heated by this high-temperature and high-pressure air. Therefore, when the resin pipe 10 is installed in the branch pipe 12, even if the temperature of the air supplied to the resin pipe 10 from the middle is low, the resin pipe 10 does not easily turn over.

  Moreover, in this Embodiment, the resin pipe 10 is installed in the branch pipe 12 by the reversal method, and in the state where the installation of the resin pipe 10 to the branch pipe 12 is completed, the non-inverted portion 10b is provided in the resin pipe 10. Since it remains, by pressing the bending member 23 having a relatively simple structure consisting of the half-cracked pipe 23a and the convex portion 23b against the protruding portion 10c from below, the protruding portion 10c is projected by the convex portion 23b to the diameter of the branch pipe 12. The protruding part 10c that has been spread out in the direction is pressed against the wall of the main pipe 11 by the half-cracked pipe 23a, and the protruding part 10c is pressed at the root portion to form the joint C between the main pipe 11 and the branch pipe 12. As a fulcrum, the branch pipe 12 can be bent radially outward.

  At this time, since the concave portion 10d is formed at the tip of the protruding portion 10c, the bending device 20 is positioned with respect to the protruding portion 10c by arranging the convex portion 23b so as to face the concave portion 10d. Can be combined. That is, the bending device 20 can be aligned with the protruding portion 10c with the recess 10d as a reference.

  Further, after the protruding portion 10c is bent and before the protruding portion 10c is cut, a through hole 10e is formed in the protruding portion 10c so that high-temperature and high-pressure air is discharged from the resin pipe 10. It becomes easy to cool, and the time until the resin pipe 10 cools and hardens can be shortened. The through-hole 10e may be anything that allows the inside and the outside of the resin pipe 10 to communicate with each other, and the position of the resin pipe 10 is not required to be high as compared with the case where the protruding portion 10c is cut. It can be formed relatively easily even in a softened state at a high temperature.

  Further, since the protruding portion 10c is cut to form the flange portion 10f, the flange portion 10f is welded to the wall surface of the main pipe 11, so that the gap between the resin pipe 10 and the main pipe 11 is sealed, and the resin pipe 10 Water or the like is prevented from entering the gap between the main pipe 11 and the main pipe 11.

  Next, modified examples in which various changes are made to the present embodiment will be described. However, the description of the same configuration as the present embodiment will be omitted as appropriate.

  In the above-described embodiment, the protruding portion 10c is bent and substantially aligned with the inner surface of the main pipe 11, and then the protruding portion 10c is cut leaving its root portion to form the flange portion 10f. Not limited. In one modified example (modified example 1), as in the above-described embodiment, as shown in FIGS. 4A to 4C, the protruding portion 10c is bent so as to be substantially along the inner surface of the main pipe 11, and protruding. After the through hole 10e is formed in the portion 10c and the resin pipe 10 is cured as shown in FIG. 4 (d), the protruding portion 10c is connected to the branch pipe 12 at the tip portion thereof as shown in FIG. 5 (a). Is cut so as to remove only the portion opposite to the portion of the protruding portion 10c, so that substantially the entire portion of the protruding portion 10c located outside the branch tube 12 in the radial direction of the branch tube 12 remains. After that, as shown in FIG. 5 (b), the remaining portion is pressed against the inner surface of the main pipe 11 by the heater 41 and welded, so that the remaining portion is overlapped more than the above embodiment. A thick flange portion 10g is formed.

  In the above-described embodiment, after the protruding portion 10c is bent and before the protruding portion 10c is cut, the through hole 10e is formed in the protruding portion 10c to discharge the air in the resin pipe 10 to the outside. However, the present invention is not limited to this. After the protruding portion 10c is bent, the through-hole 10e is not formed, and the protruding portion 10c may be cut without waiting for the resin pipe 10 to cool and harden.

  Further, in the above-described embodiment, the flange portion 10f is welded to the inner surface of the main pipe 11 after the protruding portion 10c is cut. For example, when the protruding portion 10c is bent, the flange portion 10f of the protruding portion 10c is used. When a sufficient sealing property can be ensured between the resin pipe 10 and the main pipe 11 such as when the portion to be attached is sufficiently adhered to the inner surface of the main pipe 11, the flange portion 10 f is attached to the inner surface of the main pipe 11. It is not necessary to weld.

  Further, in the above-described embodiment, the bending member 23 composed of the half cracked pipe 23a and the convex portion 23b is lifted toward the protruding portion 10c by the elevating mechanism 22, thereby pushing the protruding portion 10c by the convex portion 23b. The projecting portion 10c that has been pushed out is pressed against the wall surface of the main pipe 11 by the half-cracked pipe 23a, and the projecting portion 10c is bent at the base portion. However, the configuration for spreading the projecting portion 10c and the projecting portion that has been spread out The configuration for pressing the portion 10c against the wall surface of the main pipe 11 is not limited to this.

  Furthermore, the bending apparatus for bending the protruding portion 10c is expanded with a configuration (pushing and spreading means) for expanding the protruding portion 10c as long as the protruding portion 10c can be bent at the root portion thereof. It is not restricted to the thing provided with the structure (pressing means) for pressing the protrusion part 10c against the wall surface of the main pipe 11.

  In the above-described embodiment, high-temperature and high-pressure air is supplied to the reversing machine 14 halfway and normal-temperature and high-pressure air is supplied halfway. However, the present invention is not limited to this. For example, while the resin pipe 10 is installed in the branch pipe 12, the normal temperature and high pressure air is always supplied to the reversing machine 14, and the heater 18 is driven to heat the air supplied to the reversing machine 14. 10 is supplied with high-temperature and high-pressure air, and the heater 18 is turned off in the middle so that the air supplied to the reversing machine 14 is not heated. May be supplied.

  Furthermore, it is not limited to changing the temperature of the air supplied to the resin pipe 10 in the middle. While installing the resin pipe 10 on the branch pipe 12, for example, constantly supplying high-temperature and high-pressure air to the reversing machine 14, By continuing to drive the heater 18, high-temperature and high-pressure air may be continuously supplied to the resin pipe 10.

  In the above-described embodiment, the heater 18 is provided in the vicinity of the delivery port 14a of the reversing machine 14, but the heater 18 may be provided in another part of the reversing machine 14. Furthermore, when the high temperature and high pressure air is supplied to the reversing machine 14, the resin pipe 10 can be softened by the supplied air without heating the air supplied to the reversing machine 14. The reversing machine 14 may not be provided with the heater 18.

  Further, in the above-described embodiment, the inner surface and the outer surface of the resin pipe 10 are inverted by high-temperature and high-pressure air, and the inverted portion 10 a is advanced to the branch pipe 12 and is expanded in the radial direction of the branch pipe 12. However, instead of air, a high-temperature high-pressure fluid other than air, such as high-temperature high-pressure steam, may be used.

  Moreover, although the example which applied this invention to the lining of the branch pipe 12 in a sewer pipe was demonstrated above, it is not restricted to this, It branched from the main pipe in pipe lines other than a sewer pipe, such as a gas pipe and a water pipe The present invention can also be applied to the lining of the branch pipe.

DESCRIPTION OF SYMBOLS 10 Resin pipe 10a Inversion part 10b Non-inversion part 10c Overhang | projection part 10d Concave part 10e Through-hole 10f Eaves part 11 Main pipe 12 Branch pipe 14 Reversing machine 14a Outlet 18 Heater 20 Bending device 22 Lifting mechanism 23 Bending member 23a Half crack pipe 23b Convex Part

Claims (6)

A branch pipe lining method in which a resin pipe made of a thermoplastic synthetic resin is installed in a branch pipe branched from a main pipe, and the branch pipe is lined,
The resin tube is heated and softened by a heated and pressurized fluid, and the softened resin tube is inserted into the branch pipe from the opposite side of the main pipe, and the inner surface and the outer surface of the resin tube are reversed. The tip portion on the main tube side protrudes from the main tube by advancing the inverted portion to the branch tube, and the non-inverted portion that closes the end portion on the main tube side remains. Installed in
By introducing a heated and pressurized fluid into the resin pipe, the resin pipe is expanded in the radial direction of the branch pipe into a substantially cylindrical shape,
While the resin tube is softened, the protruding portion of the resin tube to the main tube is bent at the root portion to the outside in the radial direction of the branch tube, and is approximately along the inner surface of the main tube,
After the resin tube cools and hardens, the bent protruding portion is partially cut to form a collar portion that covers a connection portion between the main tube and the branch tube. The lining method.   After the protruding portion is substantially along the inner surface of the main pipe, a through hole for discharging the heated and pressurized fluid inside the resin tube is formed in the protruding portion before cutting the protruding portion. The method for lining a branch pipe according to claim 1. By feeding the heated and pressurized fluid to the resin tube, using a reversing machine that feeds the resin tube while reversing its inner surface and outer surface, the reversing part of the resin tube is advanced to the branch tube,
3. The branch pipe according to claim 1, wherein the reversing machine is provided with a heating device that heats an uninverted portion of the resin pipe in the vicinity of a delivery port that feeds out the resin pipe. The lining method. By feeding the heated and pressurized fluid to the resin tube, using a reversing machine that feeds the resin tube while reversing its inner surface and outer surface, the reversing part of the resin tube is advanced to the branch tube,
When the resin pipe is installed in the branch pipe, the heated and pressurized fluid is supplied from the reversing machine to the resin pipe until the reversal portion of the resin pipe reaches a predetermined position in the middle of the branch pipe. The pressurized fluid having a temperature lower than that of the heated pressurized fluid is supplied from the reversing device to the resin tube after the inverted portion of the resin tube reaches the predetermined position. 4. The method for lining a branch pipe according to any one of 3 above.   5. The branch pipe lining method according to claim 1, wherein after forming the flange portion, the flange portion is welded to the inner surface of the main pipe. In the lining method of the branch pipe according to any one of claims 1 to 5, a resin pipe processing apparatus for bending the protruding portion of the resin pipe,
Expanding means for expanding the protruding portion in the radial direction of the branch pipe by biting into the non-inverted portion;
A resin pipe processing apparatus, comprising: a pressing unit that presses the protruding portion expanded by the expanding unit toward an inner surface of the main pipe.

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