JP2018130948A - Method for renovation of existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for renovation of an existing pipe capable of improving a cooling efficiency in the renovation method comprising making a lining material formed by a thermoplastic resin coherent to the existing pipe by expanding diameter of the material.SOLUTION: An objective renovation method for an existing pipe comprises: a first step of preparing a lining material diameter-expandable into a cylindrical shape by pouring a heating fluid in the internal space of the lining material formed cylindrically by a thermoplastic resin and by deforming the material so that at least recessed part expands from an irregular shaped embodiment having at least one recessed part extending in an axial direction on an outer peripheral face; a second step of inserting the irregular shaped lining material in the existing pipe; a third step of pouring the heating fluid in the internal space of the material to expand the diameter of the material and to make the material coherent to the inner wall face of the existing pipe; and a fourth step of pouring a cooling fluid in the internal space in such a state as pressurizing the internal space of the material coherent to the inner wall face of the existing pipe to cool the material.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for rehabilitating existing pipes.

  When existing pipes such as sewer pipes, water pipes, and agricultural water pipes buried in the ground are aged, rehabilitation is carried out by lining the inner surface of the pipes without excavating the pipes. Various construction methods have been proposed and put into practical use. As one of such rehabilitation methods, for example, Patent Document 1 proposes a method of rehabilitating existing pipes using a lining material formed of a thermoplastic resin. In this method, first, the lining material is inserted into an existing pipe in a state of being deformed into an irregular shape having at least one recess extending in the axial direction on the outer peripheral surface. Subsequently, by injecting heating steam into the internal space of the lining material, the recess is deformed so as to swell, and the diameter is expanded into a cylindrical shape so as to be in close contact with the inner wall surface of the existing pipe. Following this, cooling air is injected into the interior space of the lining material to cool the lining material. Thus, the construction of the lining material is completed.

JP 2008-183840 A

  By the way, in the method of patent document 1, air is inject | poured into the pipe member which inject | pours vapor | steam, and the lining material is cooled. However, since the pipe member through which the steam has passed has a high temperature, air is heated when cooling air is injected into the pipe member. Therefore, the above method has a problem that the cooling efficiency is low. The present invention has been made in order to solve the above problem, and in a rehabilitation method in which a lining material formed of a thermoplastic resin is expanded in diameter and is in close contact with an existing pipe, cooling efficiency can be improved. It aims to provide a method for rehabilitating tubes.

  The method for rehabilitating an existing pipe according to the present invention is a lining material formed into a cylindrical shape from a thermoplastic resin, and the lining material is provided with at least one concave portion extending in the axial direction on the outer peripheral surface. A first step of preparing a lining material that is deformed so that at least the concave portion swells and expands into a cylindrical shape by injecting a heating fluid into the inner space of the inner space, and the irregularly shaped lining material A second step of inserting into the pipe, a third step of expanding the diameter of the lining material by injecting a heating fluid into the internal space of the lining material, and closely contacting the inner wall surface of the existing pipe; A fourth step of cooling the lining material by injecting a cooling liquid into the internal space in a state where the internal space of the lining material in close contact with the inner wall surface of the tube is pressurized. To have.

  According to the present invention, since the liquid is used for cooling the lining material, the cooling efficiency is higher than that of air. Therefore, the cooling time of the lining material can be shortened.

  In the above-described existing pipe rehabilitation method, in the fourth step, the pressurizing air and the cooling liquid can be mixed and supplied to the internal space of the lining material.

  In the above-described existing pipe rehabilitation method, in the fourth step, a pipe member having at least one injection port for injecting the liquid is disposed in the internal space of the lining material, and the liquid is injected from the injection port. Can do. Thereby, since the liquid can be directly sprayed on the inner wall surface of the lining material, the cooling efficiency can be further improved.

  In the above existing pipe rehabilitation method, the pipe member may have a plurality of the injection ports, and in the fourth step, the pipe member is arranged along an axial direction of the lining material, The liquid can be ejected from the mouth. Thereby, since the liquid can be directly sprayed along the axial direction onto the inner wall surface of the lining material, the cooling efficiency can be further improved.

  In the existing pipe rehabilitation method, in the fourth step, the liquid can be ejected from the ejection port while moving the pipe member along the axial direction of the lining material. Thereby, since the liquid can be directly sprayed along the axial direction onto the inner wall surface of the lining material, the cooling efficiency can be further improved.

  In the above-described existing pipe rehabilitation method, in the fourth step, the pipe member can be moved along the axial direction of the lining material while the pipe member is guided by the guide member arranged on the ground.

  In each of the above-described existing pipe rehabilitation methods, in the fourth step, the lining material can be cooled by storing a predetermined amount of the cooling liquid inside the expanded lining material.

  In the rehabilitation method for the existing pipe, a pressurizing air injection part is provided at one end of the lining material in the axial direction, and at the other end in the axial direction of the lining material, from the middle in the vertical direction of the lining material. An air discharge part for pressurization can be provided up to the upper end part.

  In the method for rehabilitating the existing pipe, a drainage portion for detection is provided at the other axial end of the lining material, and the drainage portion for detection is below the opening of the discharge port on the inner space side. And an opening in the lining material.

  In the rehabilitation method for each existing pipe, in the fourth step, the cooling liquid can be injected and the injection amount can be controlled on the ground.

  According to the present invention, the cooling efficiency can be improved in the rehabilitation method in which the diameter of a lining material formed of a thermoplastic resin is expanded and brought into close contact with an existing pipe.

It is sectional drawing of the existing pipe to which the repair method of the existing pipe which concerns on one Embodiment of this invention is applied. It is sectional drawing of a lining material. It is a figure which shows the construction method of a lining material. It is a figure which shows the construction method of a lining material. It is sectional drawing of a lining material. It is a figure which shows the other construction method of a lining material. It is a figure which shows the other construction method of a lining material. It is a figure which shows the other construction method of a lining material. It is a figure which shows a guide member. It is a figure which shows the other construction method of a lining material. It is an enlarged view which shows the other example of the front-end | tip fixing tool of a lining material. It is an enlarged view which shows the other example of the front-end | tip fixing tool of a lining material.

  Hereinafter, an embodiment of a method for rehabilitating an existing pipe according to the present invention will be described with reference to the drawings.

<1. Existing pipe>
First, an existing pipe to which the rehabilitation method according to the present embodiment is applied will be described. As shown in FIG. 1, the existing pipe 1 is formed in a cylindrical shape and extends in the horizontal direction in the ground so as to connect two vertical shafts. Here, the left vertical shaft in FIG. 1 is referred to as a first vertical shaft 21, and the right vertical shaft is referred to as a second vertical shaft 22. In the existing pipe 1, the end opening connected to the first vertical shaft 21 is referred to as a first opening 11, and the end opening connected to the second vertical shaft 22 is referred to as a second opening 12. In the present embodiment, the existing pipe 1 is constructed by inserting a lining material 3 made of a thermoplastic resin from the first shaft 21 side. Details will be described below.

<2. Outline of Lining Material>
Next, the construction of the lining material 3 will be described. First, the lining material 3 will be described. The lining material 3 is formed of a thermoplastic resin such as hard vinyl chloride resin, polyethylene, or polypropylene. Further, the lining material 3 is deformed into a different shape before construction, and after being inserted into the existing pipe 1, the diameter is increased by heating, and the lining material 3 is constructed on the existing pipe 1.

  More specifically, first, the lining material 3 is formed into a cylindrical shape by extrusion molding. At this time, as shown in FIG. 2A, the lining material 3 has an outer diameter (for example, up to about 105%) larger than the inner diameter of the existing pipe 1. Moreover, this lining material 3 memorizes the cylindrical shape of this outer diameter at the glass transition temperature of the thermoplastic resin material. Then, the lining material 3 in such an initial state is cooled and reduced in diameter to be smaller than the inner diameter of the existing pipe 1 (for example, about 90 to 95% of the inner diameter of the existing pipe), as shown in FIG. Thus, it deform | transforms into an unusual shape so that it may have the recessed part 31 in an axial direction. And the lining material 3 deform | transformed into the unusual shape is wound up by the winder 43, and is stored. Further, a tip fixing tool 32 is attached to the tip of the wound lining material 3. As will be described later, the third pipe member 53 is attached to the distal end fixture 32. In addition, you may attach the front-end | tip fixture 32 at the time of construction of the lining material mentioned later.

<3. Construction of lining material>
Next, construction of the lining material 3 will be described. First, as shown in FIG. 3, a winch 41 is arranged in the vicinity of the opening on the ground of the second vertical shaft 22, and the wire 42 fed from the winch 41 is passed through the second vertical shaft 22 and the existing pipe 1 to the first vertical shaft. Pull out to 21. Next, the lining material 3 is fed out from a winder 43 disposed near the opening on the ground of the first vertical shaft 21, and the tip fixing tool 32 of the lining material 3 is disposed in the first vertical shaft 21. Subsequently, the wire 42 is connected to the distal end fixture 32, and the wire 42 is pulled by the winch 41. Thereby, the lining material 3 is inserted into the existing pipe 1. And when the lining material 3 is arrange | positioned over the full length of the existing pipe 1, after cutting the 1st opening 11 vicinity of the lining material 3, the sealing member 33 is attached to this cut | disconnected edge part, and it seals. Note that a first pipe member 51 and a second pipe member 52 described later are attached to the sealing member 33. Further, after the lining material 3 is inserted into the existing pipe 1, the distal end fixture 32 or the vicinity of the second opening 12 of the lining material 3 may be cut and removed, and a sealing member may be attached to the end of the pipe.

  Next, as shown in FIG. 4, a boiler 61, a compressor 62, and a switching valve 63 are disposed in the vicinity of the ground opening of the first vertical shaft 21. The boiler 61 and the switching valve 63 are connected by the first pipe member 51, and the compressor 62 and the switching valve 63 are connected by the second pipe member 52. Further, the switching valve 63 and the sealing member 33 are connected by the third pipe member 53. Further, a water tank 46 is disposed in the vicinity of the opening on the ground of the first vertical shaft 21. Instead of the tank 46, a water supply truck for cleaning existing pipes before construction may be used. Then, the sealing member 33 of the lining material 3 and the tank 46 are connected by the fourth pipe member 54, and the pump 48 is disposed in the middle of the fourth pipe member 54. On the other hand, a water / steam separator 44 is disposed in the vicinity of the opening on the ground of the second vertical shaft 22, and the water / steam separator 44 and the tip fixture 32 are connected by a fifth pipe member 55. In addition, the material which forms the 1st-5th pipe members 51-55 is not specifically limited, For example, it can form with resin materials, such as a hose. This point is the same for all the pipe members shown in this specification.

  Subsequently, steam having a glass transition temperature or higher is supplied from the boiler 61 into the lining material 3 through the first pipe member 51, the switching valve 63, and the third pipe member 53. Thereby, as shown in FIG. 5, the lining material 3 is restored | restored in a cylindrical shape, while the recessed part 31 swells. Then, the supply of steam is stopped. In this process, the steam supplied into the lining material 3 flows out to the water / steam separator 44 via the fifth pipe member 55.

  Next, the switching valve 63 is switched, and non-heated air for pressurization is supplied from the compressor 62 through the second pipe member 52, the switching valve 63, and the third pipe member 53. Thereby, the lining material 3 closely_contact | adheres to the inner wall surface of the existing pipe 1, and the lining material 3 begins to cool simultaneously. Here, the lining material 3 is brought into close contact with the existing pipe 1 with unheated air, but steam may be used. Subsequently, the pump 48 is driven, and water is supplied from the tank 46 to the internal space of the lining material 3 through the fourth pipe member 54. Thereby, the lining material 3 in a pressurized state is cooled and fixed to the inner wall surface of the existing pipe 1. In addition, although illustration is abbreviate | omitted, the drainage pipe is provided in the front-end | tip fixture 32 of the lining material 3, and the water supplied to internal space from this drainage pipe can be drained sequentially. Thus, the construction of the lining material 3 is completed.

<4. Features>
In this embodiment, water is used for cooling the lining material 3. Therefore, the cooling efficiency can be improved as compared with the case of cooling the lining material using air as in the conventional example. As a result, the cooling time can be shortened.

<5. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change is possible unless it deviates from the meaning. The following modifications can be combined as appropriate.

<5-1>
In the above embodiment, the fourth pipe member 54 is connected to the sealing member 33. For example, the fourth pipe member 54 is connected to the middle of the third pipe member 53, and the lining is provided via the third pipe member 53. Water can also be supplied to the internal space of the material 3. Alternatively, the third pipe member 53 can be connected to the middle of the fourth pipe member 54.

<5-2>
In the above embodiment, water is supplied after supplying the pressurizing air. However, air and water can be supplied to the lining material 3 at the same time. Alternatively, the air and water can be mixed and then supplied to the lining material 3. Moreover, in the said embodiment, after connecting the 1st pipe member 51 and the 2nd pipe member 52 to the switching valve 63, it is connected to the sealing member 33 of the lining material 3, but the 1st pipe member 51 and The second pipe member 52 can also be directly connected to the sealing member 33.

<5-3>
The method for supplying water is not particularly limited, and examples thereof include the following methods. As shown in FIG. 6, a sixth pipe member 56 having a nozzle 47 provided with a water injection port is prepared, and the sixth pipe member 56 is arranged in the internal space of the lining material 3. The sixth pipe member 56 is connected to the fourth pipe member 54 via the sealing member 33 so that water is supplied. By doing so, water can be directly applied from the nozzle 47 to the inner wall surface of the lining material 3, so that the cooling effect can be further improved.

<5-4>
Alternatively, as shown in FIG. 7, the sixth pipe member 56 is extended over substantially the entire length of the lining material 3, and a plurality of nozzles 47 are arranged at predetermined intervals in the axial direction of the sixth pipe member 56. Thereby, since water can be applied over the substantially entire length of the inner wall surface of the lining material 3, the cooling effect can be further improved.

<5-5>
Furthermore, it can also be as shown in FIG. That is, the sixth pipe member 56 is configured to be extendable and retractable so that it can move in the axial direction in the internal space of the lining material 3. Thereby, the water sprayed from the nozzle 47 provided at the tip of the sixth pipe member 56 can be applied to the water over almost the entire length of the inner wall surface of the lining material 3. Therefore, the cooling effect can be further improved. Instead of expanding and contracting the sixth pipe member 56, for example, the fourth pipe member 54 is extended to the inside of the lining material 3, the nozzle 47 is attached to the tip, and then moved inside the lining material 3. You can also.

  At this time, the fourth pipe member 54 connected to the pump 48 and the sixth pipe member 56 arranged in the internal space of the lining material 3 are connected, and the fourth pipe member 54 is connected to the guide member 9 arranged on the ground. You can make it progress or leave. For example, the guide member 9 shown in FIG. 9 includes a guide rail 91 that is formed in an arc shape and in which an arc-shaped passage is formed. The fourth pipe member 54 is passed through the passage 92. Further, a plurality of sets of rollers 93 arranged so as to sandwich the fourth tube member 54 are arranged in the passage 92 of the guide rail 91, whereby the fourth tube member 54 smoothly moves in the passage 92. Can pass through.

  When the fourth pipe member 54 is advanced and retracted using such a guide member 9, the sixth pipe member 56 can be easily advanced and retracted in the interior space of the lining material 3 on the ground. In addition, since the internal pressure of the internal space of the lining material 3 is increased, the operation can be safely performed by operating the pipe member on the ground. Such a guide member 9 can also be used in the operation of the pipe member described so far. Further, the configuration of the guide member is not particularly limited as long as a passage through which the tube member can advance and retreat is formed.

<5-6>
In the vicinity of the pump 48 arranged on the ground, a valve and a flow meter for turning the water supply ON and OFF can be arranged on the lining material 3. Thereby, supply of water and control of supply amount can be performed on the ground. This is because the inner space of the lining material 3 has an increased internal pressure, so it is safer to control the water supply on the ground. Moreover, the valve | bulb and flowmeter which can control the drainage of water and the amount of drainage can also be provided on the ground also with respect to the drain pipe provided in the downstream of the lining material 3, ie, the front-end | tip fixture 32.

<5-7>
The cooling water can also be stored in the internal space of the lining material 3. For example, as shown in FIGS. 10 and 11, the distal end fixture 32 of the lining material 3 is provided with an exhaust pipe (exhaust portion) 35 for discharging air and a drain pipe 36 for discharging water. The exhaust pipe 35 is provided between the middle of the lining material 3 in the vertical direction and the upper end, and is particularly preferably provided near the upper end. As shown in FIG. 11, the opening 351 of the exhaust pipe 35 is arranged to face upward on the inner space side of the lining material 3. Thereby, even if water is supplied to the vicinity of the upper part of the internal space of the lining material 3, the air accumulated in the upper part of the internal space can be discharged to the outside. Therefore, the position of the exhaust pipe 35 and the position of the opening can be determined by the amount of water to be supplied.

  Further, the exhaust pipe 35 protrudes from the tip fixture 32 to the outside of the lining material 3 and is configured to communicate between the inside and outside of the lining material 3. The outer end portion of the exhaust pipe 35 can be connected to the fifth pipe member 55 described above, or may be simply opened to the outside.

  On the other hand, the drain pipe 36 is provided in the vicinity of the lower end in the vertical direction of the lining material 3 so that the water in the internal space can be discharged to the outside.

  With the above configuration, when cooling the lining material 3, water is supplied from the tank 46 to the lining material 3 by the pump 48. At this time, the drain pipe 36 is closed. Thereby, water is stored in the internal space of the lining material 3. When a predetermined amount of water is supplied to the internal space, it is held for a predetermined time. However, the non-heated air is continuously supplied during the water supply and during the cooling, and the internal pressure of the lining material 3 is maintained. The supplied air is discharged from the exhaust pipe 35 to the outside of the lining material 3. Further, when water is supplied, for example, when water enters the exhaust pipe 35 and leaks to the outside, the supply of water can be stopped. Thereby, the discharge of air from the exhaust pipe 35 is ensured. This is because if the air discharged from the exhaust pipe 35 is mixed with water, it is difficult to ensure the internal pressure.

  Thus, for example, when the temperature of the lining material 3 becomes a predetermined temperature or lower (for example, 30 ° C. or lower), the drain pipe 36 is opened and the water in the internal space is discharged. Thus, a high cooling effect can be acquired by storing water in the interior space of the lining material 3 and holding it for a predetermined time. In addition, when it is difficult for the temperature of the lining material 3 to fall, said process can be repeated. That is, water supply and drainage are repeated until the lining material 3 reaches a predetermined temperature.

  In order to easily detect the supply of water, the tip fixing tool 32 can be configured as follows. That is, as shown in FIG. 12, a detection drain pipe (detection drain section) 37 is attached to the tip fixture 32. The drainage pipe 37 for detection is attached to the tip fixing tool 32 so as to communicate the inside and outside of the lining material 3. The opening 371 on the internal space side is disposed below the opening 351 of the exhaust pipe 35, and the external opening 372 is disposed below the exhaust pipe 35. Thus, before the water supplied to the internal space of the lining material 3 enters the opening 351 of the exhaust pipe 35, the water enters the opening 371 of the detection drain pipe 37 and is discharged to the outside. Therefore, it can be easily detected that a sufficient amount of water has been supplied to the internal space.

<5-8>
The pipes (for example, the sixth pipe member 56) for supplying water to the various lining materials 3 as described above are attached to the sealing member 33 at the same time when the sealing member 33 is attached to the lining material 3. I can leave. Thereby, before the internal pressure of the lining material 3 rises, the attachment work of a pipe member can be completed, and it is safer.

<5-9>
In the above embodiment, steam and air are supplied from the boiler 61 and the compressor 62, respectively. However, any other fluid may be used as long as it is a fluid that can heat and pressurize the lining material 3, including its supply source. . Moreover, liquids other than water can also be supplied, and the supply source thereof is not particularly limited.

<5-10>
Further, the configuration of the lining material 3 is not particularly limited, and is formed in a cylindrical shape with a thermoplastic resin, and has an irregular shape with at least one recess extending in the axial direction on the outer peripheral surface before construction. Any lining material that can be deformed so that at least the concave portion swells by injecting a heating fluid and can be expanded in a cylindrical shape may be used.

1 Existing pipe 3 Lining material 35 Exhaust pipe (exhaust part)
37 Drain pipe for detection (drain section for detection)
51 1st pipe member (path of fluid for heating)
52 Second pipe member (path of fluid for pressurization)
54 Fourth pipe member (cooling liquid path)
9 Guide members

Claims (10)

A heating fluid is injected into the internal space of the lining material from a deformed shape having a cylindrical shape made of thermoplastic resin and having at least one recess extending in the axial direction on the outer peripheral surface. First step of preparing a lining material that is deformed so that at least the concave portion swells and can be expanded in a cylindrical shape, and
A second step of inserting the irregularly shaped lining material into an existing pipe;
A third step of expanding the diameter of the lining material by injecting a fluid for heating into the internal space of the lining material, and closely contacting the inner wall surface of the existing pipe;
A fourth step of cooling the lining material by injecting a cooling liquid into the internal space in a state where the internal space of the lining material in close contact with the inner wall surface of the existing pipe is pressurized;
Rehabilitation method for existing pipes.   The method for rehabilitating an existing pipe according to claim 1, wherein in the fourth step, the air for pressurization and the liquid for cooling are mixed and supplied to the internal space of the lining material.   The said 4th step WHEREIN: The pipe member which has the at least 1 injection port which injects the said liquid in the internal space of the said lining material is arrange | positioned, and the said liquid is injected from the said injection port. Rehabilitation method for existing pipes. The tube member has a plurality of the injection ports,
The rehabilitation method for an existing pipe according to claim 3, wherein in the fourth step, the pipe member is disposed along an axial direction of the lining material, and the liquid is jetted from the plurality of jetting ports.   The rehabilitation method for an existing pipe according to claim 3, wherein in the fourth step, the liquid is ejected from the ejection port while the pipe member is moved along the axial direction of the lining material.   6. The method of rehabilitating an existing pipe according to claim 5, wherein, in the fourth step, the pipe member is moved along the axial direction of the lining material while the pipe member is guided by a guide member arranged on the ground.   4. The existing pipe according to claim 1, wherein in the fourth step, the lining material is cooled by storing a predetermined amount of the cooling liquid inside the expanded lining material. 5. Rehabilitation method.   A pressurizing air injection part is provided at one end of the lining material in the axial direction, and at the other end in the axial direction of the lining material, the lining material is pressed between the middle in the vertical direction and the upper end. The method for rehabilitating an existing pipe according to claim 7, wherein an air discharge part is provided. On the other end of the lining material in the axial direction, a drainage part for detection is provided,
The method for rehabilitating an existing pipe according to claim 8, wherein the drainage part for detection has an opening below the opening of the discharge part on the inner space side and extends to the outside of the lining material.   The method for rehabilitating an existing pipe according to any one of claims 1 to 9, wherein in the fourth step, the cooling liquid is injected and the injection amount is controlled on the ground.