JP2019100507A - Heating device of pipe reclamation member - Google Patents

Abstract

To provide a heating device of a pipe reclamation member which can prevent excessive temperature rise in a heating chamber.SOLUTION: A heating device 10 of a pipe reclamation member includes a heating chamber 12. The heating chamber 12 is provided with: a rotary table 38 on which a pipe reclamation member 102 is placed; and a hot air inflow port 66 which sends hot air from a hot air generation device 62 into the heating chamber 12. The heating device includes: a temperature detection part 82 disposed below the rotary table; and a control part 92 which controls the hot air generation device on the basis of a detection result of the temperature detection part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heating apparatus for a pipe renewal member, and more particularly, to a heating apparatus for a pipe renewal member, which heats and softens a pipe renewal member for rehabilitating an existing pipe before inserting it into the existing pipe.

  Conventionally, as a method for retiring an existing existing pipe, after inserting a pipe retreading member made of a synthetic resin which has been bent and reduced in diameter into the existing pipe, the diameter is restored to a cylindrical shape and the inner surface of the existing pipe is lined. The way to do it is known. Such a pipe retreading member is difficult to insert into the existing pipe as it is, and therefore, when inserted into the existing pipe, it is heated and softened in order to reduce the insertion resistance.

  Patent Document 1 discloses an example of a heating device that heats and softens a pipe regenerating member before inserting it into an existing pipe. The heating device of Patent Document 1 includes a heating chamber in which a pipe renewal member is accommodated. The heating chamber is provided with a steam pipe for feeding steam into the heating chamber and the inside of the pipe renewal member, and the hot air from the hot air generator is used to vaporize the water adhering to the surface of the pipe renewal member. A hot air inlet is provided which feeds into the heating chamber from below. Further, a heat softening temperature measuring device is provided in the heating chamber. This heat-softening temperature measuring device includes a solid body made of the same synthetic resin material as that of the pipe renewing member, and a temperature detection unit (temperature measurement element) provided inside the solid body. The shortest distance from the outer surface of the solid body to the temperature detecting portion is set in correlation with the thickness of the pipe regenerating member, and an environment similar to the refractory portion of the pipe regenerating member is created around the temperature detecting portion.

According to the technology of Patent Document 1, it is possible to heat the pipe regenerating member while confirming the softened state of the hard-to-heat portion, so the pipe regenerating member can be heated without heating the pipe regenerating member more than necessary. Can be softened properly. That is, it is possible to know the appropriate heating completion time of the pipe regenerating member.
Unexamined-Japanese-Patent No. 2012-193753

  In order to dry the surface of the pipe renewing member inexpensively and in a short time, high temperature (for example, 200 ° C. or more) hot air is fed into the heating chamber. However, if the hot air is continuously supplied until the heating completion time of the pipe regenerating member, the temperature in the heating chamber may increase with time and may become high enough to adversely affect the pipe regenerating member. Also, excessive high temperature may deteriorate the heating device itself.

  Therefore, the main object of the present invention is to provide a novel heating device for a pipe renewal member.

  Another object of the present invention is to provide a heating device for a pipe regenerating member capable of appropriately preventing an excessive temperature rise in the heating chamber.

  A first invention relates to a heating device for a pipe renewal member, which heats and softens a pipe renewal member to renovate an existing pipe before inserting the pipe renewal member into the existing pipe, the heating chamber in which the pipe renewal member is accommodated, and the pipe renewal in the heating chamber. A rotating table supporting the members, a hot air generator provided outside the heating chamber, a hot air inlet located below the rotating table, which sends the hot air from the hot air generator into the heating chamber, arranged below the rotating table, heating It is a heating device of a pipe renewal member provided with a temperature detection part which detects temperature in a room, and a control part which controls a hot-air generator based on a detection result by a temperature detection part.

  In the first aspect of the present invention, the heating device for the pipe renewal member includes a heating chamber in which the pipe renewal member is accommodated, and heats and softens the pipe renewal member before it is inserted into the existing pipe. The heating chamber is provided with a turntable for supporting the pipe regenerating member. In addition, a hot air generator is provided outside the heating chamber, and the hot air from the hot air generator is sent into the heating chamber from a hot air inlet disposed below the rotating table. Furthermore, a temperature detection unit is provided in the heating chamber below the rotary table, and the control unit controls the hot air generator based on the detection result by the temperature detection unit. Thus, the temperature in the heating chamber is adjusted to a predetermined temperature.

  According to the first aspect of the invention, since the hot air generator is controlled based on the detection result by the temperature detection unit, an excessive temperature rise in the heating chamber can be prevented. In addition, since the temperature detection unit is disposed below the rotary table, it is possible to quickly detect that the heating chamber has reached a predetermined temperature. Therefore, the pipe renewal member can be appropriately heated and softened without adversely affecting the pipe renewal member.

  A second invention is according to the first invention, has a plurality of through holes formed in a predetermined arrangement, and is substantially horizontal below the rotating table and above the hot air inlet. A heat flow control plate is provided in the heating chamber to spread and control the flow of the hot air, and the temperature detection unit is disposed in the space between the rotating table and the heat flow control plate.

  In the second aspect of the invention, the heat flow control plate for controlling the flow of the hot air in the heating chamber is provided, and the temperature detection unit is disposed in the space between the heat flow control plate and the rotating table. In the heating chamber, a plurality of members or parts are provided in addition to the pipe renewal member to be heated. These members or parts become an obstacle to the flow (heat flow) of the hot air sent from the hot air inlet into the heating chamber, and the supply of the hot air in the heating chamber may be biased. By doing this, the hot air can be appropriately spread to the portion where the hot air is difficult to flow into.

  According to the second aspect of the invention, since the heat flow adjusting plate is provided, the hot air can be properly spread over the entire heating chamber. Therefore, it is possible to prevent the occurrence of an excessively high temperature portion in the heating chamber, and to uniformly heat the pipe renewal member over its entire length.

  In addition, since the temperature detection unit is disposed in the space between the rotating table and the heat flow adjustment plate, the temperature substantially uniformized by the heat flow adjustment plate can be detected, and the detection accuracy of the temperature in the heating chamber can be stabilized.

  A third invention is according to the second invention, and the temperature detection unit is disposed immediately above the through hole of the heat flow control plate.

  In the third invention, the temperature detection unit is disposed immediately above the through hole formed in the heat flow adjustment plate. That is, the temperature is detected along the flow of the hot air rising through the through hole. By this, the detection accuracy of the temperature in the heating chamber can be stabilized.

  A fourth invention is according to any one of the first to third inventions, wherein the hot air inlet is disposed on the outer periphery of the heating chamber, and the temperature detection unit is on the opposite side to the hot air inlet in plan view It is located within a range of 90 ° centered on a line extending from the hot air inlet toward the central axis of the turntable.

  In the fourth invention, the temperature detection unit is disposed at a position opposite to the hot air inlet. By this, the detection accuracy of the temperature in the heating chamber can be stabilized.

  A fifth invention is according to the fourth invention, and the temperature detection unit is disposed at an outer peripheral portion of the heating chamber.

  In the fifth aspect of the invention, the temperature detection portion is disposed on the outer peripheral portion of the heating chamber which is easily heated by hot air and is likely to have a high temperature. Accordingly, it is possible to quickly detect that the high temperature portion is generated in the heating chamber while stabilizing the detection accuracy of the temperature in the heating chamber.

  According to the present invention, since the hot air generator is controlled based on the detection result by the temperature detection unit, it is possible to prevent an excessive temperature rise in the heating chamber. In addition, since the temperature detection unit is disposed below the rotary table, it is possible to quickly detect that the heating chamber has reached a predetermined temperature. Therefore, the pipe renewal member can be appropriately heated and softened without adversely affecting the pipe renewal member.

  The above-described objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments given with reference to the drawings.

It is an illustration figure showing a heating device of a pipe renewal member which is one example of this invention. It is a schematic sectional drawing which expands and shows the heating chamber part of the heating apparatus of FIG. It is a top view which shows the bottom part of the heating chamber of FIG. It is an illustration figure which shows an example of the pipe renewal member wound by drumless. It is a top view which shows an example of the heat flow adjustment board with which the heating apparatus of FIG. 1 is provided. It is an illustration figure which shows an example of a temperature sensor. It is an illustration figure which expands and shows the attachment part of the temperature sensor of the heating apparatus of FIG. It is an illustration figure which shows the attachment position of a temperature sensor. It is a block diagram which shows the electric constitution of the heating apparatus of FIG. It is an illustration figure which shows a mode that an existing pipe is regenerated using the pipe renewal member heat-softened by the heating apparatus of FIG. It is an illustration figure which shows an example of the pipe | tube renewal member wound by the drum for winding.

  With reference to FIG. 1 and FIG. 10, the heating apparatus 10 (it is only hereafter called "the heating apparatus 10") of the pipe renewal member which is one Example of this invention repairs the existing pipe 100 which became old from the inside It is a device for heating and softening the pipe retreading member 102 to be inserted before inserting it into the existing pipe 100.

  First, prior to the specific description of the heating device 10, the pipe regenerating member 102 will be briefly described. The pipe retreading member 102 is a long pipe made of a rigid vinyl chloride and a synthetic resin such as polyethylene, and is wound in a predetermined form and transported. As shown in FIG. 4, in this embodiment, the tube retreading member 102 has a diameter reduction shape having a substantially wedge-shaped cross section including a flat plate portion 102a and an elliptical cylindrical portion 102b formed at both ends thereof. It is wound in a spiral shape (roll shape).

  The pipe renewal member 102 can be manufactured by a known manufacturing method. When manufacturing the pipe renewal member 102, first, a straight pipe is extruded at a predetermined diameter. Then, in a state in which the straight pipe is heated to a predetermined temperature (for example, about 100 ° C. in the case of the hard vinyl chloride pipe renewal member 102) in the range from the softening point to the melting point, A diameter reduction process such as, etc. is performed to make a cross-sectional substantially wedge-shaped diameter reduction shape. As a result, the reduced diameter tube regenerating member 102 is restored to its original shape such as a cylindrical shape by heating and pressurizing again to a temperature not less than the softening point and not more than the melting point. In addition, the pipe regeneration member 102 is set so that the outer diameter when restored is substantially equal to the inner diameter of the existing pipe 100. The inner diameter of the existing pipe 100 to be rebuilt is, for example, 100-700 mm.

  Such a pipe renewal member 102 can be applied to the rehabilitation of existing pipes 100 of various applications and constituent materials. For example, it can be applied to rehabilitating gas pipes, water and sewage pipes and cable protective pipes, and the material of rehabilitating pipes may be any of reinforced concrete, cast iron, steel and synthetic resin. .

  Subsequently, a heating device 10 according to an embodiment of the present invention will be specifically described. As described above, the heating device 10 is a device for heating and softening the pipe refreshing member 102, and includes the heating chamber 12 that accommodates the pipe refreshing member 102.

  As shown in FIGS. 1 to 3, the heating chamber 12 includes a base 14 and a tent portion 16 provided on the base 14, and is formed in a hollow substantially cylindrical shape as a whole. The diameter of the heating chamber 12 is, for example, 2550 mm, and the length in the vertical direction (that is, the height of the back) is, for example, 1700 mm.

  The base 14 is a portion that constitutes the bottom wall of the heating chamber 12 and is formed in a disk shape from iron and a metal such as SUS (stainless steel). Also, under the base 14, a rectangular frame-shaped base frame 18 is provided, and the base 14 is held by the base frame 18 in a state of having a predetermined space below.

  The tent part 16 is a part which comprises the top wall and side wall of the heating chamber 12, and is formed in a topped cylindrical shape. In this embodiment, the tent portion 16 is provided with a frame 20 forming the framework and an awning sheet 22 placed on the frame 20. The frame 20 is formed, for example, by combining hollow pipes made of iron and metal such as SUS longitudinally and longitudinally, and includes a vertical frame 20a and a horizontal frame 20b connecting upper ends of the vertical frame 20a. Further, the awning sheet 22 is formed of an elastic material such as heat-resistant rubber, and airtightly covers the ceiling portion and the side portion of the frame 20.

  In addition, a covering member 24 is provided to cover the upper surface and the outer surface of the awning sheet 22. The covering member 24 is formed of a material having heat insulation, wind resistance and water resistance. For example, as the covering member 24, a commercially available heat shielding sheet formed by sandwiching both surfaces of a base material such as a resin sheet with a metal layer such as aluminum foil can be used. By covering the entire outer surface of the heating chamber 12 with such a covering member 24, it is possible to reduce the influence of the external environment (disturbance factor) such as the outside air temperature, wind and rain on the internal environment of the heating chamber 12. Therefore, the heating condition of the pipe regenerating member 102 in the heating chamber 12 can be made uniform or stabilized regardless of the external environment. In addition, having wind resistance said here has the performance which does not pass the wind, and at least meets the standard of wind resistance according to JIS A6111: 2004 (passing time according to JIS P8117 Gurley tester method is 10 seconds or more). Say that it is a thing.

  In such a heating chamber 12, a base 26 and a base shaft 28 are provided as a rotating mechanism for rotating the pipe refreshing member 102. The base 26 is formed in an annular plate shape from iron and a metal such as SUS, and is installed on the upper surface of the base 14. Gear teeth are formed on the outer peripheral surface of the base 26, and the transmission gear 30 is connected to the gear teeth of the base 26. The driving force of the driving motor 32 is transmitted to the transmission gear 30 via the transmission chain 34 or the like, and by receiving the rotational driving force from the transmission gear 30, the base 26 can be rotated about its axis.

  Further, the base shaft 28 is formed in a straight tubular shape by iron and a metal such as SUS, and is integrally erected at the central portion of the base 26. The base shaft 28 rotates with the base 26. In addition, a pipe rising portion 36 is provided inside the base shaft 28. The pipe rising portion 36 is a straight pipe made of iron and a metal such as SUS, and is erected on the base 14 so as not to rotate integrally with the base 26 and the base shaft 28. Inside the pipe rising portion 36, a rising portion of a first steam pipe 46, which will be described later, is inserted.

  Furthermore, on the base 26, a turntable 38 for mounting the pipe refreshing member 102 is provided. The rotating table 38 is formed in an annular plate shape by iron and a metal such as SUS, and the outer diameter thereof is, for example, 900 mm. Further, at the central portion of the rotating table 38, the rotating shaft 40 is integrally provided. The rotating shaft 40 is formed in a straight tubular shape by iron and a metal such as SUS, and is provided to surround the outer peripheral surface of the base shaft 28. The base 26 and the rotating table 38 are connected by an engagement pin or the like, and the rotating table 38 and the rotating shaft 40 rotate as the base 26 rotates.

  Then, the drumless type pipe regenerating member 102 is mounted on the rotary table 38. That is, the rotating shaft 40 is inserted through the winding center of the pipe regenerating member 102, and the pipe regenerating member 102 is placed on the rotary table 38. The pipe renewal member 102 placed on the turntable 38 rotates with the rotation of the turntable 38 and the rotation shaft 40.

  Further, the heating chamber 12 is provided with a steam supply unit. The steam supply unit supplies steam to the inside of the heating chamber 12, and in this embodiment, includes a first steam pipe 46 and a second steam pipe 48. However, it is pointed out in advance that the specific configuration of the steam supply unit is not limited to the following configuration. For example, any one of the first steam pipe 46 and the second steam pipe 48 can be omitted.

  A steam generator 52 provided outside the heating chamber 12 is connected to the upstream ends of the first steam pipe 46 and the second steam pipe 48 via a connection hose 50. Then, the steam heated and pressurized to a predetermined value is supplied from the steam generator 52 to the first steam pipe 46 and the second steam pipe 48.

  The first steam pipe 46 extends laterally in the lower space of the base 14 and rises at the central portion of the heating chamber 12 and extends upward through the inside of the pipe rising portion 36. The downstream end (upper end) of the first steam pipe 46 is provided with a rotating member 54 such as a known swivel, and the upstream end of the steam hose 56 is connected to the rotating member 54. The downstream end of the steam hose 56 is connected to the winding start end of the pipe renewal member 102. Then, the steam from the steam generating device 52 is supplied to the inner surface side of the pipe renewal member 102 through the first steam pipe 46, the steam hose 56, and the like. The vapor supplied to the inner surface side of the pipe renewal member 102 is discharged into the heating chamber 12 from the end on the winding end side of the pipe renewal member 102.

  Further, the second steam pipe 48 extends laterally in the lower space of the base 14, stands up at the periphery of the base 26, and is piped in a rectangular shape so as to surround the base 26. A plurality of upward discharge holes are formed at predetermined intervals in the pipe wall of the second steam pipe 48, and the steam from the steam generator 52 passes through the discharge holes of the second steam pipe 48 to the inside of the heating chamber 12 It is supplied to (the outer surface side of the pipe regeneration member 102).

  Furthermore, a hot air supply unit 58 is provided in the heating chamber 12. The hot air supply unit 58 is for supplying hot air (dry air) heated to a predetermined temperature (for example, 200 ° C. or more) into the heating chamber 12, and is provided to extend the space below the base 14 in the lateral direction. Be A hot air generator 62 such as a jet heater is connected to the upstream end of the hot air supply unit 58 via a flexible heat-resistant hose 60. Further, at the upstream end of the hot air supply unit 58, a shutter 64 for sealing the internal passage of the hot air supply unit 58 in an openable and closable manner is provided. On the other hand, the downstream end (hot air inlet 66) of the hot air supply unit 58 opens upward in a substantially trapezoidal shape at the peripheral portion of the base 14. That is, the hot air inlet 66 for feeding the hot air into the heating chamber 12 is provided below the rotating table 38. Hot air from the hot air generator 62 is supplied from the hot air inlet 66 to the inside of the heating chamber 12 via the heat resistant hose 60 and the hot air supply unit 58. The hot air supplied from the hot air inlet 66 into the heating chamber 12 evaporates the moisture adhering to the surface of the pipe refreshing member 102 to keep the surface of the pipe refreshing member 102 dry. As a result, when the pipe regenerating member 102 is taken out of the heating chamber 12 for insertion into the existing pipe 100, the temperature of the pipe regenerating member 102 is prevented from decreasing due to the heat of vaporization of the attached water.

  A heat flow adjusting plate 70 is provided in the heating chamber 12 so as to expand in a substantially horizontal direction below the rotary table 38 and above the hot air inlet 66. The heat flow adjusting plate 70 is a member for adjusting or controlling the flow of the hot air sent from the hot air inlet 66 into the heating chamber 12 so that the hot air can properly spread throughout the heating chamber 12.

  Specifically, the heat flow adjusting plate 70 is formed in an annular plate shape with metal such as iron and SUS, and spreads in a substantially horizontal direction so as to extend from the outer surface of the base 26 to the inner surface of the heating chamber 12. Provided. A plurality of legs 72 are provided on the lower surface of the heat flow adjusting plate 70, and the heat flow adjusting plate 70 is held by the legs 72 at a predetermined height position between the pipe renewal member 102 and the hot air inlet 66 Be done.

  A plurality of circular through holes 74 communicating the upper surface and the lower surface of the heat flow adjusting plate 70 are formed in a predetermined arrangement. The through hole 74 is a portion that becomes a hot air passage, and the arrangement of the through hole 74 can adjust the flow of the hot air directed upward. The diameter of each through hole 74 is, for example, 20 mm.

  In this embodiment, the opening ratio of the heat flow adjusting plate 70 by the through holes 74 is the flow of the hot air of the obstacle (for example, the gear box 76 accommodating the transmission gear 30 and the reinforcing rib 78) located below the heat flow adjusting plate 70. The upstream side is set smaller than the downstream side in the direction. This is because when there is an obstacle, the hot air strikes the obstacle and rises on the near side (upstream side) thereof, and the hot air hardly reaches the back side (downstream side) of the obstacle. Further, the through holes 74 are not formed or hardly formed in the portion immediately above the hot air inlet 66 of the heat flow adjusting plate 70. This is because the portion directly above the hot air inlet 66 is the position where the hot air is most likely to rise. That is, in this embodiment, by reducing the opening ratio of the heat flow control plate 70, the hot air appropriately spreads to the part where the hot air does not easily flow in the part where the hot air easily flows in (is easy to ascend).

  Specifically, as is clearly understood from FIG. 5, the opening ratio of the heat flow control plate 70 in the region A1 on the heat flow direction upstream side of the gearbox 76 is the heat flow control plate 70 in the region A2 on the heat flow direction downstream of the gear box 76. It is set smaller than the aperture ratio of. Further, the opening ratio of the heat flow control plate 70 in the region B1 upstream of the reinforcing rib 78 in the heat flow direction is set smaller than the opening ratio of the heat flow control plate 70 in the region B2 downstream of the heat flow direction of the reinforcing rib 78. Furthermore, since the hot air easily wraps around the outer peripheral portion of the heating chamber 12, the opening ratio of the heat flow adjusting plate 70 in the peripheral region C1 of the heating chamber 12 is higher than the opening ratio of the heat flow adjusting plate 70 in the inner region C2 on the center side Is also set small. Also, as described above, the opening ratio of the heat flow control plate 70 immediately above the hot air inlet 66 is set to zero or a value close to zero.

  By providing such a heat flow adjusting plate 70 in the heating chamber 12, the flow of hot air fed from the hot air inlet 66 into the heating chamber 12 can be adjusted or controlled, so that the hot air can be properly applied to the entire heating chamber 12. You can get it around. That is, since the temperature distribution in the heating chamber 12 can be adjusted to be uniform, it is possible to prevent the occurrence of an excessively high temperature portion in the heating chamber 12. In addition, the entire pipe renewal member 102 can be heated and softened as uniformly as possible.

  However, the arrangement of the through holes 74 shown in FIG. 5 is merely an example, and the arrangement of the through holes 74 formed in the heat flow control plate 70, such as the number, size, shape and position of the through holes 74 It can be changed as appropriate according to the situation. Further, the heat flow adjusting plate 70 may be formed of a single plate member, or may be formed by combining a plurality of plate members, for example, connecting two semicircular plate members to make them circular. Good.

  In this embodiment, the temperature sensor 80 is provided in the heating chamber 12 so that the temperature detection unit (temperature measuring element 82) is located in the space between the rotating table 38 and the heat flow adjustment plate 70.

  The type of the temperature sensor 80 is not particularly limited, but in this embodiment, a sheath resistance temperature sensor type as shown in FIG. 6 is used. The temperature sensor 80 uses a metal such as platinum or a metal oxide as a temperature measuring element 82 which is a temperature detection unit, and detects the temperature by measuring the electric resistance. The temperature sensor 80 includes a temperature measuring element 82 housed at the tip of the protective tube 84, and the temperature measuring element 82 is connected to a terminal in the terminal box 86 via a lead wire.

  As clearly seen in FIG. 7, the temperature sensor 80 is fixed to the base 14 using, for example, a fixing jig 88. The terminals in the terminal box 86 are connected to a control unit 92 described later via a wire (not shown). Further, the protective tube 84 is disposed so as to pass through the hole of the base 14 and the through hole 74 of the heat flow control plate 70, and the temperature measuring element 82 is below the rotary table 38 and the heat flow control plate 70. It is located above the top. By disposing the temperature measuring element 82 below the rotary table 38, that is, by detecting the temperature of the hot air before reaching the pipe renewal member 102, it is possible to quickly detect that the inside of the heating chamber 12 has reached a predetermined temperature. . Further, by disposing the temperature measuring element 82 above the heat flow adjusting plate 70, the temperature substantially uniformized by the heat flow adjusting plate 70 can be detected, and the detection accuracy of the temperature in the heating chamber 12 can be stabilized. Moreover, it is preferable that the temperature measuring element 82 be disposed immediately above the through hole 74 of the heat flow control plate 70. This is because detecting the temperature along the flow of the hot air rising through the through hole 74 can further stabilize the detection accuracy of the temperature in the heating chamber 12.

  Further, as shown in FIG. 8, the temperature measuring element 82 is a position opposite to the hot air inlet 66 in a plan view, and is directed from the central portion of the hot air inlet 66 toward the central axis X of the rotating table 38. It is preferable to arrange in the range W of 90 degrees centering on the line Y extended. This is because the detection accuracy of the temperature in the heating chamber 12 can be further stabilized by this. Among these, the temperature measuring element 82 is more preferable than being disposed on the outer peripheral portion of the heating chamber 12. This is because the outer peripheral portion of the heating chamber 12 is a portion where hot air easily flows around and becomes hot, so it is possible to quickly detect that a high temperature portion is generated in the heating chamber 12 while stabilizing detection accuracy.

  However, the attachment method and attachment position of the temperature sensor 80 with respect to the heating chamber 12 are not limited to the aspect shown in FIG. 7 and FIG.

  Returning to FIG. 1, a control device 90 is provided outside the heating chamber 12. The control device 90 includes a control unit 92 including a CPU, a memory and the like, and an operation unit such as an operation button (not shown). As shown in FIG. 9, the control unit 92 is connected to the hot air generator 62, the temperature sensor 80, and the like. The detection result of the temperature measuring element 82 of the temperature sensor 80 (that is, the temperature data in the heating chamber 12) is output to the control unit 92. The control unit 92 adjusts the inside of the heating chamber 12 to a predetermined temperature by controlling the on / off of the hot air generator 62 based on the detection result. That is, after the control unit 92 starts the supply of hot air into the heating chamber 12 by the hot air generator 62, when the detection result of the temperature measuring element 82 reaches the preset temperature set in advance, the controller 92 causes the hot air generator 62 to At the same time, it outputs a stop signal to stop the hot air supply. On the other hand, when the detection result of the temperature measuring element 82 falls below the set temperature, an operation signal for starting the hot air supply to the hot air generator 62 is output. In this embodiment, the control unit 92 outputs a stop signal when the temperature detected by the temperature measuring element 82 reaches 140 ° C., and outputs an operation signal when the temperature falls from 140 ° C. to 0.5 ° C. Control the on / off of the generator 62. As a result, the average temperature around the pipe renewal member 102 is maintained at an appropriate temperature of 100 to 110 ° C., and the temperature in the heating chamber 12 is prevented from being excessively raised.

  Then, with reference to FIG. 1 and FIG. 10, the construction method of rehabilitating the existing pipe 100 which has become obsolete using the heating device 10 and the pipe rehabilitating member 102 will be described.

  When the existing pipe 100 is to be rebuilt, first, the remaining material and the like in the regenerating section of the existing pipe 100 are removed and cleaned. Further, the heating device 10 is installed on the side of the shaft 110 at the starting point, and the pipe regenerating member 102 is mounted on the rotating table 38 in the heating chamber 12. In addition, on the end shaft 112 side, a winch 116 for winding the pulling wire 114 is installed.

  Next, the pipe renewal member 102 is heated and softened using the heating device 10. To heat and soften the pipe renewal member 102, first, the base 26 is operated to rotate the pipe renewal member 102 placed on the rotary table 38. Subsequently, the steam generator 52 is operated to supply steam to the inner surface side of the pipe renewing member 102 through the first steam pipe 46 etc., and the entire inside of the heating chamber 12 through the second steam pipe 48 etc. Supply steam to Further, the hot air generator 62 is operated to supply hot air from the hot air inlet 66 to the inside of the heating chamber 12, and the steam supplied into the heating chamber 12 is further heated by the hot air. At this time, since the on / off of the hot air generator 62 is controlled based on the detection result of the temperature measuring element 82, the temperature in the heating chamber 12 is prevented from being excessively increased. Further, since the heat flow adjusting plate 70 is provided in the heating chamber 12, the hot air can be distributed substantially equally throughout the entire heating chamber 12, and generation of an excessively high temperature portion in the heating chamber 12 is prevented. it can.

  When the pipe renewal member 102 is sufficiently heated and softened by heating the pipe renewal member 102 for a predetermined time in a predetermined atmosphere temperature, the pipe renewal member 102 is subsequently drawn out from the inside of the heating chamber 12 and the existing pipe 100 is installed. Insert inside That is, the pull wire 114 is connected to the tip of the pipe renewal member 102, and then the pipe regeneration member 102 is drawn into the existing pipe 100 by winding the pull wire 114 with the winch 116. At this time, since the surface of the pipe regenerating member 102 is kept in a dry state by heating by the hot air generator 62, the temperature does not decrease due to the heat of vaporization. Therefore, the softened state of the pipe renewal member 102 necessary for the insertion into the existing pipe 100 can be properly continued.

  When the tip end of the pipe member 102 reaches the vertical shaft 112, both ends of the pipe member 102 are cut, metal fittings for expansion and the like are attached thereto, and the pipe end of the pipe member 102 is sealed. Then, steam is supplied into the pipe renewal member 102 using a steam generator to heat the pipe renewal member 102 and apply an internal pressure. Then, the cross-sectional shape of the pipe regenerating member 102 is restored to a true circular shape or a substantially true circular shape, and the entire outer peripheral surface of the tube regenerating member 102 is in close contact with the entire inner peripheral surface of the existing pipe 100.

  Thereafter, in a state where the internal pressure is maintained, cooling air is supplied from the cooling nozzle or the like into the pipe refreshing member 102 to cool the pipe refreshing member 102. After cooling, the pressurized air is exhausted from the inside of the pipe renewal member 102, and the post-treatment is appropriately performed to complete the repair of the existing pipe 100 using the pipe renewal member 102.

  As described above, according to this embodiment, since the hot air generating device 62 is controlled based on the detection result by the temperature measuring element (temperature detecting unit) 82, an excessive temperature rise in the heating chamber 12 can be prevented. In addition, since the temperature measuring element 82 is disposed below the rotary table 38, it is possible to quickly detect that the inside of the heating chamber 12 has reached a predetermined temperature. Therefore, the pipe regeneration member 102 can be appropriately heated and softened without adversely affecting the pipe regeneration member 102.

  Further, according to this embodiment, since the heat flow adjusting plate 70 for adjusting the flow of the hot air is provided in the heating chamber 12, the hot air can be appropriately spread over the entire inside of the heating chamber 12. Therefore, it is possible to prevent the occurrence of an excessively high temperature in the heating chamber 12 and to uniformly heat the pipe renewal member 102 over its entire length, so various effects such as stabilization of construction quality can be achieved. It can be demonstrated.

  In addition, in the above-mentioned Example, although the pipe regeneration member 102 is made into the diameter reduction shape of a cross-sectional substantially wedge shape, and is wound by a drumless, the diameter reduction shape and winding appearance of the pipe regeneration member 102 are not specifically limited. For example, it may be a diameter-reduced shape that is folded by folding, or may be a diameter-reduced shape that has a substantially heart-shaped cross section in which a part in the circumferential direction is pressed.

  Further, as shown in FIG. 11, a pipe retreading member 102 wound around a winding drum 120 may be used. For example, the winding drum 120 includes a body 122 and a flange 124, and is formed of iron and a metal such as SUS. The body portion 122 has a double cylinder structure including an inner cylinder and an outer cylinder, and the pipe regenerating member 102 is spirally wound around the outer peripheral surface thereof. The flanges 124 are provided at both ends of the body portion 122, and project outward in the form of a bowl from the outer peripheral surface of the body portion 122 in the radial direction.

  In the case of the drum winding type pipe renewal member 102 as shown in FIG. 11, a winding drum 120 is mounted on the base 26 instead of the turntable 38 and the rotating shaft 40. Then, the winding drum 120 and the pipe renewing member 102 rotate as the base 26 rotates. That is, in this case, the lower flange 124 of the winding drum 120 serves as a rotating table for supporting the pipe refreshing member 102.

  Note that the specific numerical values such as the dimensions mentioned above and the specific shapes of the respective parts are all merely examples, and can be appropriately changed according to the necessity of the specification of the product and the like.

DESCRIPTION OF SYMBOLS 10 ... Heating device 12 ... Heating chamber 38 ... Rotation stand 46 ... 1st steam pipe 48 ... 2nd steam pipe 62 ... Hot air generation device 66 ... Hot air flow inlet 70 ... Heat flow adjustment board 74 ... Through hole 80 ... Temperature sensor 82 ... Measurement Thermal element (temperature detection unit)
92 ... control unit 100 ... existing pipe 102 ... pipe renewal member

Claims (5)

A heating device for a pipe renewal member, which heats and softens a pipe renewal member for renewing an existing pipe before inserting the pipe renewal member into the existing pipe,
A heating chamber in which the pipe renewal member is accommodated;
A rotary table for supporting the pipe renewal member in the heating chamber;
A hot air generator provided outside the heating chamber,
A hot air inlet, which is disposed below the rotating table and feeds hot air from the hot air generator into the heating chamber;
Heating of a pipe refreshing member, comprising a temperature detection unit disposed below the rotary table and detecting a temperature in the heating chamber, and a control unit controlling the hot air generator based on the detection result by the temperature detection unit apparatus. It has a plurality of through holes formed in a predetermined arrangement, and is provided in the heating chamber so as to expand in a substantially horizontal direction below the rotating table and above the hot air inlet. It has a heat flow adjustment plate to adjust the flow of hot air,
The heating device for a pipe renewal member according to claim 1, wherein the temperature detection unit is disposed in a space between the rotating table and the heat flow control plate.   The heating device for a pipe renewal member according to claim 2, wherein the temperature detection unit is disposed immediately above the through hole of the heat flow adjustment plate. The hot air inlet is disposed at an outer peripheral portion of the heating chamber,
The temperature detection unit is located at a position opposite to the hot air inlet in a plan view, and within a range of 90 ° centered on a line extending from the hot air inlet toward the central axis of the rotating table. The heating device for a pipe renewal member according to any one of claims 1 to 3, which is disposed at.   The heating device for a pipe renewal member according to claim 4, wherein the temperature detection unit is disposed at an outer peripheral portion of the heating chamber.

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