JP6792263B2 - How to heat pipe rehabilitation member - Google Patents

Description

The present invention relates to a method for heating a pipe rehabilitation member, and more particularly to a method for heating a pipe rehabilitation member in which the pipe rehabilitation member for rehabilitating an existing pipe is heated and softened before being inserted into the existing pipe.

Conventionally, as a method of rehabilitating an existing pipe, a pipe rehabilitation member made of synthetic resin that has been bent, deformed and reduced in diameter is inserted into the existing pipe, and then the pipe rehabilitation member is expanded and restored to a cylindrical shape by applying heating and internal pressure. There is known a method of lining the inner surface of an existing pipe. Since it is difficult to insert such a pipe rehabilitation member into the existing pipe as it is, when it is 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 method in which a pipe rehabilitation member is heated and softened before being inserted into an existing pipe. In the technique of Patent Document 1, after the pipe rehabilitation member wound around the drum in a predetermined diameter reduction state is installed in the heating chamber, steam is supplied to the inner surface side of the pipe rehabilitation member and the heating chamber (that is, the pipe rehabilitation member). By supplying both steam and hot air to the outer surface side), the pipe rehabilitation member is heated and softened. Further, in the heating chamber, a heating softening temperature measuring device including a medium substance and a temperature measuring element provided inside the substance is provided, and the softening state of the pipe rehabilitation member can be accurately determined from the measurement result of the heating softening temperature measuring device. I am trying to do it.
Japanese Unexamined Patent Publication No. 2012-193753

In the technique of Patent Document 1, since the pipe rehabilitation member is heated from both the inner surface side and the outer surface side, the pipe rehabilitation member can be heated in a short time, but the apparatus becomes large-scale. Further, in order to accurately determine the softened state of the pipe rehabilitation member, a special device such as a heating softening temperature measuring device is required. However, the construction site for rehabilitating the existing pipe may be a narrow land such as a narrow road, and it is not always possible to install a large-scale device.

Therefore, a main object of the present invention is to provide a novel method for heating a tube rehabilitation member.

Another object of the present invention is to provide a method for heating a pipe rehabilitation member, which can reduce the size of the device so that it can be applied to construction in a narrow space and can accurately determine that the entire pipe rehabilitation member has been heated and softened. It is to be.

The first invention is a method for heating a pipe rehabilitation member for rehabilitating an existing pipe by heating and softening the pipe rehabilitation member in a heating chamber before inserting the pipe rehabilitation member into the existing pipe. (A) A turntable provided inside the heating chamber. Step to install the pipe rehabilitation member on the part , (B) While operating the turntable part to rotate the pipe rehabilitation member, the inner surface side of the pipe rehabilitation member without supplying heat medium from the outer surface side of the pipe rehabilitation member The step of heating the pipe rehabilitation member by supplying steam only to the pipe rehabilitation member, and discharging the steam supplied to the inner surface side of the pipe rehabilitation member to the outside of the heating chamber without discharging it into the inside of the heating chamber, and (C) temperature. A method of heating a pipe rehabilitation member, which comprises a step of measuring the outer surface temperature of the pipe rehabilitation member using a sensor.

In the method for heating a pipe rehabilitation member according to the first invention, the pipe rehabilitation member for rehabilitating an existing pipe is heated and softened before being inserted into the existing pipe. First, in step (A), the pipe rehabilitation member is installed on the turntable portion provided inside the heating chamber. Next, in step (B), while operating the turntable portion to rotate the pipe rehabilitation member, the inner surface side of the pipe rehabilitation member without supplying heat medium such as steam and hot air from the outer surface side of the pipe rehabilitation member. The tube rehabilitation member is heated by supplying steam only to it. Further, the steam supplied to the inner surface side of the pipe rehabilitation member is discharged to the outside of the heating chamber without being discharged to the inside of the heating chamber. Then, in step (C), the outer surface temperature of the pipe rehabilitation member is measured using a temperature sensor, and when the measured temperature reaches a predetermined temperature, the heating softening step is terminated. In this way, when steam is supplied only to the inner surface side of the pipe rehabilitation member so that the heat medium is not supplied to the outer surface side of the heating chamber, the outer surface side of the pipe rehabilitation member becomes meat from the inner surface side of the pipe rehabilitation member. It is heated only by the heat transferred through the thick interior. Therefore, the outer surface temperature of the pipe rehabilitation member is measured, and if the outer surface temperature reaches a predetermined temperature, it can be seen that the temperature is sufficiently raised to the inside of the wall thickness of the pipe rehabilitation member.

According to the first invention, the pipe rehabilitation member is heated and softened by supplying steam only to the inner surface side of the pipe rehabilitation member without supplying a heat medium from the outer surface side of the pipe rehabilitation member. it can. Therefore, it can be appropriately used for construction in a narrow area. Further, since the pipe rehabilitation member is heated only from the inner surface side thereof, it is accurately determined that the entire pipe rehabilitation member has been heated and softened by confirming that the outer surface temperature of the pipe rehabilitation member has reached a predetermined temperature. it can.

The second invention is dependent on the first invention, and in step (C), the measurement of the outer surface temperature of the pipe rehabilitation member is performed at the downstream end in the flow direction of the steam supplied to the inner surface side of the pipe rehabilitation member. ..

In the second invention, the outer surface temperature of the pipe rehabilitation member is measured at the downstream end portion in the steam flow direction, which is the portion to be heated last in the longitudinal direction of the pipe rehabilitation member (the portion where heating is completed slowly). .. Therefore, if this portion is sufficiently heated, it can be seen that the pipe rehabilitation member is sufficiently heated over the entire longitudinal direction thereof.

According to the second invention, it can be more accurately determined that the entire tube rehabilitation member has been heat-softened.
The third invention is dependent on the first or second invention, and in step (B), the steam supplied to the inner surface side of the pipe rehabilitation member is of the heating chamber via the rotating shaft portion provided on the turntable portion. Discharge to the outside.

According to the present invention, the pipe rehabilitation member is heated and softened by supplying steam only to the inner surface side of the pipe rehabilitation member without supplying a heat medium from the outer surface side of the pipe rehabilitation member, so that the apparatus can be miniaturized. Therefore, it can be appropriately used for construction in a narrow area. Further, since the pipe rehabilitation member is heated only from the inner surface side thereof, it is accurately determined that the entire pipe rehabilitation member has been heated and softened by confirming that the outer surface temperature of the pipe rehabilitation member has reached a predetermined temperature. it can.

The above-mentioned object, other object, feature and advantage of the present invention will become more apparent from the detailed description of the examples described below with reference to the drawings.

It is a schematic diagram which shows the heating apparatus used in the heating method of the tube rehabilitation member which is one Example of this invention. It is a schematic diagram which shows the winding drum and the pipe rehabilitation member of FIG. It is a schematic diagram which shows the end part on the winding end side of the pipe rehabilitation member of FIG. It is a schematic diagram which shows the double tube swivel provided in the heating device of FIG. It is a schematic diagram which shows the state of rehabilitating an existing pipe using a pipe rehabilitation member.

With reference to FIGS. 1 and 5, in the method of heating the pipe rehabilitation member according to an embodiment of the present invention, the pipe rehabilitation member 102 for repairing the aged existing pipe 100 from the inside is installed in the existing pipe 100. It is a method of heating and softening before inserting. As will be described in detail later, in this heating method, the heating device 10 is used to supply steam only to the inner surface side of the pipe rehabilitation member 102 without supplying the heat medium from the outer surface side of the pipe rehabilitation member 102. The pipe rehabilitation member 102 is heated and softened.

First, the pipe rehabilitation member 102 will be briefly described before the specific description of the heating method according to the present invention. The tube rehabilitation member 102 is a long tube formed of a synthetic resin such as rigid vinyl chloride and polyethylene, and as shown in FIG. 2, has a spiral shape (roll) with respect to the winding drum 30 in a predetermined diameter reduction state. It is wrapped around a shape) and transported. In this embodiment, the tube rehabilitation member 102 has a substantially gourd-shaped reduced diameter shape having a flat plate-shaped portion 102a and elliptical tubular portions 102b formed at both ends thereof, and is wound around the winding drum 30. However, the pipe rehabilitation member 102 may be drumlessly wound in a predetermined winding shape and transported.

The pipe rehabilitation member 102 can be manufactured by a known manufacturing method. When manufacturing the pipe rehabilitation member 102, first, a straight pipe is extruded to a predetermined diameter. Then, in a state where the straight pipe is heated to a predetermined temperature in the range of the softening point or more and the melting point or less (for example, about 100 ° C. in the pipe rehabilitation member 102 made of rigid vinyl chloride), it is flattened by using a push plate or a roller. The diameter is reduced to a gourd-shaped cross section. As a result, the tube rehabilitation member 102 having a reduced diameter shape is restored to its original shape such as a cylindrical shape by heating and pressurizing again to a temperature equal to or higher than the softening point and lower than the melting point. The pipe rehabilitation 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 rehabilitated is, for example, 100-700 mm.

The pipe rehabilitation member 102 can be applied to the rehabilitation of the existing pipe 100 of various uses and constituent materials. For example, it can be applied to rehabilitation of gas pipes, water and sewage pipes, cable protection pipes, etc., and the material of the rehabilitated pipeline may be any of reinforced concrete, cast iron, steel, synthetic resin, and the like. ..

Subsequently, the heating device 10 used in this heating method will be described. The heating device 10 is a device for heating and softening the pipe rehabilitation member 102, and includes a heating chamber 12 for accommodating the pipe rehabilitation member 102.

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

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

The tent portion 16 is a portion constituting the top wall and the side wall of the heating chamber 12, and is formed in a climax cylindrical shape. In this embodiment, the tent portion 16 includes a frame 20 that forms the framework thereof, and a awning sheet 22 that covers the frame 20. The frame 20 is formed by, for example, vertically and horizontally combining hollow pipes made of metal such as iron and SUS. 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.

Further, in this embodiment, the covering member 24 is provided so as to cover the outer surface (upper surface and outer surface of the awning sheet 22) of the heating chamber 12. The covering member 24 is made of a material having heat insulating properties, windproof properties and waterproof properties. For example, as the covering member 24, a commercially available heat shield sheet formed by sandwiching both sides of a base material such as a resin sheet with a metal layer such as aluminum foil can be used. In this embodiment, the covering member 24 has a first ceiling cover 24a covering the upper surface of the awning sheet 22, a body-wrapping cover 24b covering the outer surface of the awning sheet 22, and an upper portion of the first ceiling cover 24a and the body-wrapping cover 24b. Includes a second ceiling cover 24c that covers from.

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 conditions of the pipe rehabilitation member 102 in the heating chamber 12 can be made uniform or stabilized regardless of the external environment. The term "windproof" as used herein means having a windproof performance, and at least satisfies the JIS A6111: 2004 windproof standard (passing time according to the JIS P8117 Garley testing machine method is 10 seconds or more). Say that it is a thing.

In such a heating chamber 12, a rotary base portion 26 and a rotary shaft portion 28 are provided as a rotation mechanism for rotating the winding drum 30 (tube rehabilitation member 102). The turntable portion 26 is formed in a ring plate shape by a metal such as iron and SUS, and is installed on the upper surface of the base portion 14. Although not shown, the driving force from the drive motor is transmitted to the turntable portion 26 via a transmission chain, a transmission gear, and the like, whereby the turntable portion 26 can rotate around its axis. Further, the rotary shaft portion 28 is formed in a straight tubular shape by metal such as iron and SUS, and is erected at the central portion of the rotary base portion 26. The rotation shaft portion 28 rotates together with the turntable portion 26.

Then, a winding drum 30 is installed on the turntable portion 26 so as to surround the outer peripheral surface of the rotary shaft portion 28. As shown in FIG. 2, the winding drum 30 includes a body portion 32 and a flange 34, and is made of a metal such as iron and SUS. The body portion 32 has a double cylinder structure including an inner cylinder and an outer cylinder, and the pipe rehabilitation member 102 is spirally wound around the outer peripheral surface thereof. The flanges 34 are provided at both ends of the body portion 32 and project radially outward from the outer peripheral surface of the body portion 32 in a flange shape. The outer diameter of the body portion 32 is, for example, 900 mm, and the outer diameter of the flange 34 is, for example, 2400 mm. The winding drum 30 and the pipe rehabilitation member 102 rotate with the rotation of the turntable portion 26 and the rotation shaft portion 28.

Returning to FIG. 1, the heating chamber 12 was supplied with the steam supply path 42, which is a path for supplying the steam from the steam generator 40 to the inner surface side (inside) of the pipe rehabilitation member 102, and into the pipe rehabilitation member 102. A steam discharge path 44, which is a path for discharging steam to the outside of the heating chamber 12 without discharging the steam into the heating chamber 12, is provided.

Specifically, a double pipe having an outer pipe 46 and an inner pipe 48 is provided inside the rotating shaft portion 28. The double pipe (outer pipe 46 and inner pipe 48) rotates with the rotation of the turntable portion 26 and the rotation shaft portion 28.

A first hose connection portion 50 is provided at the upper end portion of the outer pipe 46, and an upstream end portion of the air supply hose 52 is connected to the first hose connection portion 50. The downstream end of the air supply hose 52 is connected to a sealing member (not shown) attached to the pipe end on the winding start side of the pipe rehabilitation member 102 so as to communicate with the inside of the pipe rehabilitation member 102. Be connected.

A second hose connecting portion 54 is provided at the upper end of the inner pipe 48, and the downstream end of the exhaust hose 56 is connected to the second hose connecting portion 54. As shown in FIG. 3, a sealing member 58 is attached to the pipe end on the winding end side of the pipe rehabilitation member 102, and the upstream end of the exhaust hose 56 communicates with the inside of the pipe rehabilitation member 102. , It is connected to the connection port 58a formed in the sealing member 58. Further, a drain port 58b is formed in the sealing member 58. Water (drain) generated by the condensation of steam in the pipe rehabilitation member 102 is discharged to the outside of the pipe rehabilitation member 102 from the drain port 58b.

On the other hand, a double pipe swivel 60 is provided at the lower ends of the double pipes 46 and 48. As shown in FIG. 4, the double pipe swivel 60 includes a substantially cylindrical swivel case 62 having an air supply port 62a and an exhaust port 62b. Inside the swivel case 62, a substantially cylindrical spindle 68 is rotatably provided via a bearing 64, a seal ring 66, and the like. The lower end of the outer pipe 46 is connected to the upper end of the spindle 68 via a joint 70. Further, a substantially cylindrical cap 72 is provided inside the spindle 68, and the lower end portion of the inner pipe 48 is connected to the cap 72. The cap 72 seals the space between the inner surface of the spindle 68 and the outer surface of the inner tube 48.

In this way, when the outer pipe 46 and the inner pipe 48 and the double pipe swivel 60 are connected, the space between the inner surface of the outer pipe 46 and the outer surface of the inner pipe 48 communicates with the air supply port 62a. On the other hand, the internal space of the inner pipe 48 communicates with the exhaust port 62b. Then, when the double pipes 46 and 48 rotate with the rotation of the turntable portion 26 and the rotation shaft portion 28, the spindle 68 moves while the swivel case 62 (air supply port 62a and exhaust port 62b) maintains a non-rotating state. Rotates with double tubes 46,48.

Returning to FIG. 1, an air supply pipe 74 connected to the steam generator 40 is connected to the air supply port 62a of the double pipe swivel 60. Further, an exhaust pipe 76 extending to the outside of the heating chamber 12 is connected to the exhaust port 62b. The steam supplied from the steam generator 40 passes through the air supply pipe 74, the space between the inner surface of the outer pipe 46 and the outer surface of the inner pipe 48, and the steam supply path 42 including the air supply hose 52 and the like. It is supplied from the pipe end on the winding start side of the rehabilitation member 102 to the inner surface side of the pipe rehabilitation member 102. The steam supplied to the inner surface side of the pipe rehabilitation member 102 flows to the pipe end on the winding end side of the pipe rehabilitation member 102, and the steam discharge path 44 including the exhaust hose 56, the internal space of the inner pipe 48, the exhaust pipe 76, and the like. It is discharged to the outside of the heating chamber 12 through the heating chamber 12.

Further, in this embodiment, the outer surface temperature of the pipe rehabilitation member 102 is applied to the end portion on the winding end side of the pipe rehabilitation member 102, that is, the downstream end portion in the flow direction of the steam supplied to the inner surface side of the pipe rehabilitation member 102. A temperature sensor 78 for detection is provided. As the temperature sensor 78, a thermistor, a resistance temperature detector, a thermocouple, or the like can be used. Although not shown, the temperature detected by the temperature sensor 78 is displayed on the temperature display unit of the monitor installed outside the heating chamber 12. Further, when the temperature detected by the temperature sensor 78 reaches a predetermined temperature, a notification unit such as an alarm for notifying the completion of heating may be provided.

Subsequently, with reference to FIGS. 1 and 5, a method of heating and softening the pipe rehabilitation member 102 using the heating device 10 and a method of rehabilitating the existing pipe 100 with the heat-softened pipe rehabilitation member 102 will be described.

When rehabilitating the existing pipe 100, first, the accumulated matter and the like in the rehabilitation section of the existing pipe 100 are removed and washed, and the pipe rehabilitation member 102 is prepared for heating. That is, the heating device 10 is installed on the shaft 110 side of the starting point, and the pipe rehabilitation member 102 wound around the winding drum 30 is installed inside the heating chamber 12. At this time, the air supply hose 52 is used to connect the pipe end on the winding start side of the pipe rehabilitation member 102 to the first hose connection portion 50 of the outer pipe 46, and the exhaust hose 56 is used to wind the pipe rehabilitation member 102. The end of the pipe on the end side is connected to the second hose connection portion 54 of the inner pipe 48. A winch 116 for winding the tow wire 114 is installed on the shaft 112 side at the end point.

When the preparation for heating of the pipe rehabilitation member 102 is completed, the pipe rehabilitation member 102 is subsequently heated and softened by using the heating device 10. When the pipe rehabilitation member 102 is heated and softened, first, the entire heating device 10 is tilted by about 5 °, and then the turntable portion 26 is operated to rotate the winding drum 30 and the pipe rehabilitation member 102. Next, the steam generator 40 is operated to supply steam to the inner surface side of the pipe rehabilitation member 102 via the steam supply path 42. Further, the steam supplied to the inner surface side of the pipe rehabilitation member 102 is discharged to the outside of the heating chamber 12 via the steam discharge path 44. That is, the pipe rehabilitation member 102 is heated by supplying steam only to the inner surface side of the pipe rehabilitation member 102 without supplying the heat medium from the outer surface side of the pipe rehabilitation member 102, and is supplied to the inner surface side of the pipe rehabilitation member 102. The steam is discharged to the outside of the heating chamber 12 without being discharged to the inside of the heating chamber 12.

Then, the temperature sensor 78 is used to measure the outer surface temperature at the end of the pipe rehabilitation member 102 on the winding end side, and when it is confirmed that the outer surface temperature of the pipe rehabilitation member 102 has reached a predetermined temperature (for example, 80 ° C.), The steam generator 40 is stopped to end the heating and softening step of the pipe rehabilitation member 102.

Here, if the pipe rehabilitation member 102 is heated by supplying a heat medium such as steam and hot air from the outer surface side of the pipe rehabilitation member 102, even if the outer surface temperature of the pipe rehabilitation member 102 is measured by the temperature sensor 78, It is difficult to determine whether only the surface portion of the pipe rehabilitation member 102 has been heated or whether the temperature has been raised to the inside of the wall thickness. On the other hand, as in this embodiment, when steam is supplied only to the inner surface side of the pipe rehabilitation member 102 so that the heat medium is not supplied to the outer surface side of the heating chamber 12, the outer surface of the pipe rehabilitation member 102 The side is heated only by the heat transferred from the inner surface side of the pipe rehabilitation member 102 through the inside of the wall thickness. Therefore, the outer surface temperature of the pipe rehabilitation member 102 is measured, and if the outer surface temperature reaches a predetermined temperature, it can be seen that the temperature is sufficiently raised to the inside of the wall thickness of the pipe rehabilitation member 102. Further, since the heating chamber 12 is not filled with steam, it is easy to visually check the pipe rehabilitation member 102, and it is easy to visually confirm the status of the pipe rehabilitation member 102.

Further, if the heat medium is supplied only to the outer surface side of the pipe rehabilitation member 102 to heat the pipe rehabilitation member 102, it is difficult to heat the overlapped portion of the pipe rehabilitation member 102 wound in a spiral shape. On the other hand, when steam is supplied only to the inner surface side of the pipe rehabilitation member 102 to heat the pipe rehabilitation member 102 as in this embodiment, such a problem does not occur and the entire pipe rehabilitation member 102 is affected. It is heated almost uniformly.

Note that, as referred to in the present invention, discharging steam to the outside of the heating chamber 12 without discharging it to the inside of the heating chamber 12 does not mean completely preventing the steam from leaking into the heating chamber 12. .. As long as it does not affect the measurement of the outer surface temperature of the pipe rehabilitation member 102, some leakage of the steam supplied to the inner surface side of the pipe rehabilitation member 102 into the heating chamber 12 is allowed.

The longitudinal position for measuring the outer surface temperature of the pipe rehabilitation member 102 is not particularly limited, but as in this embodiment, the end portion of the pipe rehabilitation member 102 on the winding end side, that is, the downstream end in the steam flow direction. By measuring the outer surface temperature in the portion, it can be determined that the pipe rehabilitation member 102 has sufficiently raised the temperature over the entire longitudinal direction thereof. That is, since the downstream end portion of the pipe rehabilitation member 102 in the steam flow direction is the portion that is finally heated in the longitudinal direction of the pipe rehabilitation member 102 (the portion where the heating is completed slowly), this portion is sufficiently elevated. If it is warmed up, it can be seen that the tube rehabilitation member 102 has been sufficiently heated over the entire longitudinal direction thereof. Therefore, it can be more accurately determined that the entire pipe rehabilitation member 102 has been heat-softened. Further, since the temperature sensor 78 is installed on the outer surface of the end end side of the pipe rehabilitation member 102 on the winding end side, it is easy to install the temperature sensor 78.

Returning to the description of the rehabilitation method for the existing pipe 100, when the heating and softening step of the pipe rehabilitation member 102 is completed, the pipe rehabilitation member 102 is subsequently pulled out from the heating chamber 12 and inserted into the existing pipe 100. At this time, the temperature sensor 78 and the exhaust hose 56 are removed from the pipe end on the winding end side of the pipe rehabilitation member 102. Then, the tow wire 114 is inserted into the existing pipe 100 from the shaft 112 side at the end point, and the tow wire 114 is connected to the tip end (pipe end on the winding end side) of the pipe rehabilitation member 102. After that, the pipe rehabilitation member 102 is pulled into the existing pipe 100 by winding the tow wire 114 with the winch 116.

When the tip of the pipe rehabilitation member 102 reaches the shaft 112, both ends of the pipe rehabilitation member 102 are cut, a diameter-expanding metal fitting or the like is attached thereto, and the pipe end of the pipe rehabilitation member 102 is sealed. Then, steam is supplied into the pipe rehabilitation member 102 using the steam generator 40 to heat the pipe rehabilitation member 102 and apply internal pressure. Then, the cross-sectional shape of the pipe rehabilitation member 102 is expanded and restored to a perfect circular shape or a substantially perfect circular shape, and the entire outer peripheral surface of the pipe rehabilitation member 102 is substantially brought into close contact with the entire inner peripheral surface of the existing pipe 100.

After that, while maintaining the internal pressure, cooling air is supplied into the pipe rehabilitation member 102 from the cooling air supply port provided in the diameter-expanding metal fitting or the like to cool the pipe rehabilitation member 102. After cooling, compressed air is discharged from the inside of the pipe rehabilitation member 102, and post-treatment is appropriately executed to complete the repair of the existing pipe 100 using the pipe rehabilitation member 102.

As described above, according to this embodiment, the pipe rehabilitation member 102 is heated and softened by supplying steam only to the inner surface side of the pipe rehabilitation member 102 without supplying a heat medium from the outer surface side of the pipe rehabilitation member 102. Therefore, the heating device 10 can be miniaturized. Therefore, it can be appropriately used for construction in a narrow area.

Further, since the pipe rehabilitation member 102 is heated only from the inner surface side thereof, by confirming that the outer surface temperature of the pipe rehabilitation member 102 has reached a predetermined temperature, the temperature is sufficiently raised to the inside of the wall thickness of the pipe rehabilitation member 102. You can see that it is doing. Therefore, it can be accurately determined that the entire pipe rehabilitation member 102 has been heat-softened.

In the above embodiment, when the pipe rehabilitation member 102 is installed in the heating chamber 12, the axis for rotating the pipe rehabilitation member 102 extends in the vertical direction (that is, the winding drum 30 is rotated in the horizontal direction). However, it may be installed so that the shaft for rotating the pipe rehabilitation member 102 extends in the lateral direction (that is, the winding drum 30 is rotated in the vertical direction).

Further, in the above embodiment, the upstream end of the exhaust hose 56 is connected to the connection port 58a of the sealing member 58, but the upstream end of the exhaust hose 56 is connected to the drain port 58b of the sealing member 58. You may try to do it. For example, the connection port 58a may be closed with a stopper or the like, or a sealing member 58 without the connection port 58a may be used. Then, the upstream end of the exhaust hose 56 is connected to the drain port 58b, and the downstream end of the exhaust hose 56 is connected to the rotary shaft 28 from the lower end of the rotary shaft 28 to connect the rotary shaft 28. A drain outlet may be provided in the. This makes it possible to minimize the leakage of steam into the heating chamber 12.

Further, in the above-described embodiment, the pipe rehabilitation member 102 has a reduced diameter shape having a substantially gourd cross section, and the winding drum 30 is wound around the pipe rehabilitation member 102. Not limited. For example, it may have a reduced diameter shape that is folded by folding, or may have a reduced diameter shape that has a substantially heart-shaped cross section in which a part of the circumferential direction is pushed.

Furthermore, in the above-described embodiment, the pipe rehabilitation member 102 is heated and softened while being rotated, but the pipe rehabilitation member 102 does not necessarily have to be rotated. When the pipe rehabilitation member 102 is heated without rotating, it is not always necessary to provide the double pipe swivel 60. For example, the end of the pipe rehabilitation member 102 on the winding end side is taken out directly to the outside of the heating chamber 12, or the exhaust hose connected to the end of the pipe rehabilitation member 102 on the winding end side is taken out of the heating chamber 12 for heating. Steam can also be exhausted to the outside of the chamber 12.

It should be noted that the specific numerical values such as the dimensions and the specific shapes mentioned above are merely examples, and can be appropriately changed as necessary such as product specifications.

10 ... Heating device 12 ... Heating chamber 24 ... Covering member 26 ... Rotating table 28 ... Rotating shaft 30 ... Winding drum 40 ... Steam generator 42 ... Steam supply path 44 ... Steam discharge path 60 ... Double pipe swivel 100 ... Existing pipe 102 ... Pipe rehabilitation member

Claims (3)

A method for heating a pipe rehabilitation member for rehabilitating an existing pipe by heating and softening the pipe rehabilitation member in a heating chamber before inserting it into the existing pipe.
(A) A step of installing the pipe rehabilitation member on a turntable provided inside the heating chamber,
(B) While operating the turntable portion to rotate the pipe rehabilitation member, steam is supplied only to the inner surface side of the pipe rehabilitation member without supplying a heat medium from the outer surface side of the pipe rehabilitation member. The steam supplied to the inner surface side of the pipe rehabilitation member is discharged to the outside of the heating chamber without being discharged to the inside of the heating chamber, and (C) a temperature sensor is used. A method for heating a pipe rehabilitation member, which comprises a step of measuring the outer surface temperature of the pipe rehabilitation member. The heating of the pipe rehabilitation member according to claim 1, wherein in the step (C), the measurement of the outer surface temperature of the pipe rehabilitation member is performed at the downstream end portion in the flow direction of the steam supplied to the inner surface side of the pipe rehabilitation member. Method. The pipe according to claim 1 or 2, wherein in the step (B), the steam supplied to the inner surface side of the pipe rehabilitation member is discharged to the outside of the heating chamber via the rotation shaft portion provided on the turntable portion. How to heat the rehabilitation member.

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