JP2009051185A - Renovation method of mounting pipe opening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a renovation method of a mounting pipe opening that can prevent a saddle member from peeling off and falling during construction and surely prevent a collapse or the like by firmly mounting the saddle member to the mounting pipe opening. <P>SOLUTION: The renovation method of the mounting pipe opening 7 comprises mounting the saddle member 4 to the mounting pipe opening 7 for connecting an existing mounting pipe 6 to an existing main pipe 5, wherein the saddle member 4 composed of thermoplastic resin is formed of a curved plate part 1 and a short cylinder part 3 protrusively provided around a hole part 2 of the curved plate part 1. A renovation pipe 8 is led in and attached to the existing mounting pipe 6, and after cutting a portion, projecting on the existing main pipe 5 side, of the renovation pipe 8, the short cylinder part 3 formed in a smaller diameter than the inner diameter of the end 9 of the renovation pipe 8 is inserted in the end 9 of the renovation pipe 8 from the existing main pipe 5 side. The short cylinder part 3 is heated while being pressurized from the inside. The short cylinder part 3 is thereby enlarged in diameter to come in close contact with the inner surface of the end 9 of the renovation pipe 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rehabilitation method for an attachment pipe port.

As a method of refurbishing the mounting pipe port where the existing mounting pipe is attached to the existing main pipe, a saddle member made of thermosetting resin is attached to the mounting pipe port, and the saddle member is heated by heating with an air plug with a built-in heat source. Press against the mounting pipe port and soften it to attach it in close contact, and then draw the rehabilitation pipe (lining pipe) into the existing installation pipe, expand it into a cylindrical shape by heating, and then soften it. 2. Description of the Related Art Conventionally, an apparatus that presses the inner surface of a mounting tube and the inner surface of a short cylindrical portion of a saddle member (portion provided in an existing mounting tube) is known (for example, see Patent Document 1).
11 to 14 show other conventional rehabilitation methods. In FIG. 11, after the saddle member made of thermoplastic resin is attached to the attachment tube port, the inner surface of the existing attachment tube and the short of the saddle member are shown. The rehabilitation pipe 8 is drawn into the inner surface of the cylindrical portion (see FIGS. 12 and 13), and thereafter, as shown in FIG. 14, the rehabilitation pipe 8 is cut by the cutting blade 22 of the cutting machine 21 arranged in the existing main pipe 5. This is a method of cutting the protruding portion along the lower surface of the saddle member 24.

Japanese Patent Publication No. 6-63592

  As in Patent Document 1, in the method of heating a saddle member made of a thermosetting resin, a portion where the heating provided by the air plug is not uniformly transmitted to the entire saddle member is formed, and an uncured portion is formed on the saddle member. In some cases, it is not firmly attached to the attachment tube port, and easily peels off after construction. In addition, a bad odor is generated from the thermosetting resin during curing, which hinders work.

  Further, in the construction method shown in FIGS. 11 to 14, when the rehabilitation pipe is pulled into the existing mounting pipe and the hole of the saddle member, the outer surface of the rehabilitation pipe comes into contact with the inner surface of the hole of the saddle member. Therefore, the saddle member may be deformed, or the saddle member may be peeled off from the existing mounting pipe. Moreover, when the rehabilitation pipe is heated and expanded after being pulled and pressed against the saddle member, the saddle member may be deformed or peeled off from the existing mounting pipe. Furthermore, when the end of the rehabilitation pipe is cut with the cutting blade of the cutting machine, the cutting blade scrapes the bottom surface of the saddle member to cause damage, and the drainage reaches the attachment pipe port from the damaged portion, causing collapse or the like. In some cases.

  Accordingly, the present invention provides a mounting pipe port rehabilitation method that can prevent the saddle member from peeling off during construction, and can securely prevent the collapse of the saddle member by firmly attaching the saddle member to the mounting pipe port. Objective.

  The rehabilitation method of the mounting pipe port according to the present invention includes a saddle member made of a thermoplastic resin formed from a curved plate portion and a short cylindrical portion projecting around a hole portion of the curved plate portion, and is installed on an existing main pipe. A rehabilitation method for a mounting pipe port for attaching the saddle member to a mounting pipe port for connecting a pipe, wherein the rehabilitating pipe is drawn into the existing mounting pipe and protrudes to the existing main pipe side of the rehabilitating pipe. After cutting the portion, the short cylindrical portion formed with a diameter smaller than the inner diameter of the end portion of the rehabilitation pipe is inserted into the end portion of the rehabilitation pipe from the existing main pipe side, and the short cylinder portion is inserted into the inner side. This is a method of expanding the diameter of the short cylindrical part to the inner surface of the end part of the rehabilitated pipe by heating it while applying pressure from above.

In this method, the saddle member is pressurized in the range of 0.03 MPa to 0.1 MPa and heated in the range of 60 ° C to 130 ° C.
Moreover, it is a construction method in which the short cylindrical portion of the saddle member is heated while being pressurized with an air plug incorporating a heater.

According to the present invention, since the saddle member is formed from a thermoplastic resin, an odor is generated even when heating and cooling are performed during the mounting operation, unlike those formed from a thermosetting resin. There is no such thing. In addition, when the thermosetting resin is used, heat is not transmitted evenly as a whole, and an uncured portion of the resin is generated.
In addition, in order to heat the saddle member within an appropriate range, the curved plate portion of the thermoplastic saddle member is securely attached to the inner surface of the existing main pipe, and the short cylindrical portion is efficiently expanded in diameter. In addition, since the pressure on the saddle member is within an appropriate range, the saddle member can be operated without damaging the expansion member of the mounting machine, and the short cylindrical portion of the saddle member can be attached to the inner surface of the rehabilitation pipe. It can be adhered.

In addition, when the rehabilitation pipe is drawn into the existing attachment pipe after the saddle member is attached to the existing pipe opening, there is a problem that the saddle member is peeled off or deformed in the process of drawing the rehabilitation pipe. With this construction method, the saddle member is attached after the rehabilitation pipe is drawn into the existing attachment pipe, that is, at the end of the process, so that the collapse can be reliably prevented without any problem of peeling or deformation.
Further, since the saddle member is attached after the end of the rehabilitation pipe drawn into the existing attachment pipe is cut, the saddle member cannot be damaged by the cutting blade of the cutting machine, and can be renewed efficiently.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 7 and FIG. 10 show an embodiment of the rehabilitation method for the attachment pipe port according to the present invention. Reference numeral 4 denotes a saddle member formed of the curved plate portion 1 and a short cylindrical portion 3 protruding around the hole portion 2 of the curved plate portion 1. The saddle member 4 is formed from a thermoplastic resin, and examples thereof include polyethylene resin, polypropylene resin, and polyvinyl chloride.

  The saddle member 4 before being attached to the attachment tube port 7 (before deformation) will be specifically described. The curved plate portion 1 of the saddle member 4 is formed in a bowl shape along the inner surface of the existing main pipe 5, and the thickness dimension is uniform as a whole, and is formed to be approximately 1 to 2 mm. Further, the short cylindrical portion 3 is formed to have the same height dimension T along the curved plate portion 1. That is, the upper edge of the short cylindrical portion 3 has a curved concave shape when viewed from the side (as viewed from the direction orthogonal to the axial direction of the existing main pipe 5), and the height dimension T from the upper surface of the curved plate portion 1 is It is formed to 5 mm to 30 mm. If the length is less than 5 mm, the saddle member 4 slides down or drops from the mounting machine 15 when the saddle member 4 is moved in the existing main pipe 5 while the saddle member 4 is placed on the mounting machine (pasting machine) 15 described later. There is a fear. On the other hand, if it exceeds 30 mm, the short cylindrical portion 3 may come into contact with the upper surface of the existing main pipe 5 when moving in the existing main pipe 5 with the saddle member 4 placed on the mounting machine 15. You may not be able to move to.

The outer diameter dimension φ of the short cylindrical portion 3 of the saddle member 4 is formed to be smaller than the inner diameter dimension D of the rehabilitation pipe 8 that is drawn into the existing attachment pipe 6 and attached, thereby forming a gap. The size of the gap to be formed is preferably 15 mm or more and 25 mm or less, and most preferably about 20 mm. If it is less than 15 mm, it may be difficult to insert the saddle member 4 into the later-described end portion 9 of the rehabilitation tube 8, and workability may deteriorate, and if it exceeds 25 mm, the short cylindrical portion 3 is greatly expanded. Since the diameter must be reduced, workability is poor.
When the specific dimensions of the saddle member 4 are exemplified, for example, when the saddle member 4 is attached corresponding to the existing main pipe 5 having a diameter of 250 mm, the curved plate portion 1 is also formed to have a curvature radius of approximately 125 mm. Further, the length L of the curved plate portion 1 (the length in the axial direction of the existing main pipe 5) is formed to be approximately 300 mm.

Here, the attachment machine 15 for attaching the saddle member 4 to the attachment pipe port 7 will be described. FIG. 9 shows an example of the attaching machine 15, and the attaching machine 15 has a sticking expansion member (rubber member) 17 incorporating a heater mounted on a moving carriage 16. As the expansion member 17, for example, a member generally called an air plug formed of NBR rubber is preferably used.
The expansion member 17 has a horizontally elongated substantially cylindrical main body expansion part 19 and a branch expansion part 18 formed at the upper center of the main body expansion part 19, and a built-in heater is used. Both the main body expansion part 19 and the branch expansion part 18 are heated.
Regarding the operation of the expansion member 17, first, only the main body expansion portion 19 expands (the saddle member 4 is pressed against the inner surface of the existing main pipe 5 by this expansion). In the process in which the main body expanding portion 19 expands, the heater remains stopped. Next, the branch expansion section 18 expands, and simultaneously with the expansion, the heater starts to operate, and the main body expansion section 19 and the branch expansion section 18 are heated.

Next, the procedure of the rehabilitation method for the mounting pipe port according to the present invention will be described.
First, as shown in FIG. 1, the wire of the retractor 20 is connected to a distal end tool fixed to the distal end of the rehabilitation pipe 8, and the rehabilitation pipe 8 is pulled into the existing attachment pipe 6. The rehabilitation pipe 8 is made of, for example, a thermoplastic resin, and has a shape memorized so as to be restored to a cylindrical shape by heating, and is made of a polyvinyl chloride resin.

  Next, steam is supplied from the steam generator installed on the ground into the rehabilitation pipe 8 and heated to 70 ° C. which is the shape memory temperature as the original cylindrical pipe, as shown in FIG. The rehabilitation pipe 8 is heated and restored to a cylindrical shape, the rehabilitation pipe 8 is brought into close contact with the inner surface of the existing mounting pipe 6, and then cooled. Then, the wire is removed from the tip of the rehabilitation tube 8.

  Next, as shown in FIG. 3, a cutting machine 21 having a cutting blade 22 is introduced into the existing main pipe 5. Then, the cutting blade 22 cuts the portion of the rehabilitated pipe 8 that protrudes toward the existing main pipe 5, and the end 9 of the rehabilitated pipe 8 protrudes from the inner surface of the existing main pipe 5 around the attachment pipe port 7. Or formed so as to protrude slightly.

  Next, the above-described saddle member 4 is placed on the expansion member 17 of the attachment machine 15, and the carriage 16 of the attachment machine 15 is caused to travel within the existing main pipe 5. As shown in FIG. While confirming with the monitor, the saddle member 4 is moved until the short cylindrical portion 3 of the saddle member 4 is located below the attachment tube port 7 (the end portion 9 of the rehabilitation tube 8), and the state shown in FIGS. 4 and 5 is obtained. .

  Then, from the state of FIGS. 4 and 5, first, the main body inflating portion 19 of the inflating member 17 is inflated, so that the curved plate portion 1 of the saddle member 4 is replaced with the existing main pipe as shown in FIG. The short cylindrical portion 3 is inserted into the inner side of the end portion 9 of the rehabilitating tube 8. Since the outer diameter dimension φ of the short cylindrical portion 3 is formed smaller than the inner diameter dimension D of the rehabilitated tube 8 as described above, it can be smoothly inserted. In this process, there is no heating by a heater.

  Next, as shown in FIG. 7, the branch inflating portion 18 of the inflating member 17 is inflated and pressurized with a certain size. At the same time, the heater is also operated to heat the saddle member 4 from the branch expansion portion 18 and the main body expansion portion 19 of the expansion member 17. Then, due to the heating from the main body expanding portion 19, the curved plate portion 1 of the saddle member 4 becomes soft and deforms to match the shape of the inner surface of the existing main pipe 5. In addition, although the short cylindrical portion 3 is gradually softened by heating from the branch expansion portion 18, since a certain amount of pressure continues to be applied from the branch expansion portion 18, the short cylindrical portion 3 gradually expands in diameter (saddle). The diameter of the hole 2 of the member 4 is also increased.) As shown in FIG. 8, the hole 4 is in close contact with the inner surface of the end portion 9 of the rehabilitated tube 8. As described above, the curved plate portion 1 of the saddle member 4 is in close contact with the inner surface of the existing main pipe 5 and the short cylindrical portion 3 is in close contact with the inner surface of the tip 9 of the rehabilitation pipe 8 around the attachment pipe port 7. The attachment pipe port 7 is reliably renewed by the saddle member 4.

  The pressurization to the short cylindrical part 3 of the branch expansion part 18 is performed in the range of 0.03 MPa to 0.1 MPa. If it is less than 0.03 MPa, the force that pushes and expands the short cylindrical portion 3 from the inside is weak, so that it cannot be sufficiently adhered to the inner surface of the rehabilitated tube 8. On the other hand, if it exceeds 0.1 MPa, the rubber part of the expansion member 17 of the attachment machine 15 is likely to be damaged.

  Moreover, the heating temperature from the branch expansion part 18 to the short cylindrical part 3 is the range of 60 degreeC-130 degreeC. If the temperature is less than 60 ° C., the saddle member 4 made of thermoplastic resin is not sufficiently soft, so that the curved plate portion 1 is not deformed so as to match the shape of the inner surface of the existing main pipe 5, and a gap is formed. This causes or the short cylindrical portion 3 does not expand in diameter (or takes time). Moreover, when it exceeds 130 degreeC, when the expansion member 17 is formed with NBR rubber, it will deteriorate easily.

  Thus, by setting the pressurization temperature and the range of the heating temperature as described above, the curved plate portion 1 of the saddle member 4 made of thermoplastic resin surely adheres to the inner surface of the existing main pipe 5, The short cylindrical portion 3 can be efficiently expanded in diameter. In addition, the short cylindrical portion 3 of the saddle member 4 can be brought into close contact with the inner surface of the rehabilitating pipe 8 without damaging the expansion member 17 of the attachment machine 15.

  Since the saddle member 4 is formed of a thermoplastic resin, no odor is generated during heating and cooling. In addition, when the thermosetting resin is used, an uncured portion of the resin is generated when heat is not transmitted evenly as a whole, but there is no such concern.

In addition, as shown in FIGS. 11 to 14 of the conventional example, when the rehabilitation pipe is drawn into the existing mounting pipe after the saddle member is attached to the existing pipe opening, the saddle member is peeled off or deformed by being dragged by the rehabilitation pipe. However, with the method of the present application, since the saddle member 4 is attached after the rehabilitation pipe 8 is drawn into the existing attachment pipe 6, that is, at the end of the process, the problem is also solved. Is done.
Further, since the saddle member 4 is attached after the end of the rehabilitation pipe 8 drawn into the existing attachment pipe 6 is cut, the saddle member 4 is not damaged by the cutting blade 22 of the cutting machine 21 and is excellent. Rehabilitation can be performed.

As described above, the attachment pipe port rehabilitation method according to the present invention is a saddle member made of a thermoplastic resin formed from the curved plate portion 1 and the short cylindrical portion 3 projecting around the hole portion 2 of the curved plate portion 1. 4 is a rehabilitation method of the mounting pipe port 7 for attaching the saddle member 4 to the mounting pipe port 7 for connecting the existing mounting pipe 6 to the existing main pipe 5, and the rehabilitating pipe 8 is drawn into the existing mounting pipe 6 After cutting the portion of the rehabilitation pipe 8 that protrudes toward the existing main pipe 5 side, the short cylindrical portion 3 formed with a smaller diameter than the inner diameter of the end 9 of the rehabilitation pipe 8 is removed from the existing main pipe 5 side. By inserting into the end portion 9 of the rehabilitating tube 8 and heating the short cylindrical portion 3 while applying pressure from the inside, the short cylindrical portion 3 is expanded in diameter with respect to the inner surface of the end portion 9 of the rehabilitating tube 8 and closely attached Since the saddle member 4 is made of thermoplastic resin, it is different from the one made of thermosetting resin. When heating and cooling, there is no odor generation, and there is no risk of formation of uncured parts that may occur in the case of thermosetting resins. Go and you can prevent collapse.
In addition, when the rehabilitation pipe is drawn into the existing attachment pipe after the saddle member is attached to the existing pipe opening, there is a problem that the saddle member is peeled off or deformed in the process of drawing the rehabilitation pipe 8. With the construction method of the present application, the saddle member 4 is attached after the rehabilitation pipe 8 is drawn into the existing attachment pipe 6, that is, at the end of the process, so there is no problem of peeling or deformation, and the collapse is ensured. Can be prevented.
The saddle member 4 is attached after the end of the rehabilitation pipe 8 drawn into the existing attachment pipe 6 is cut, so that the saddle member 4 is not damaged by the cutting blade of the cutting machine, and excellent rehabilitation is achieved. It can be carried out.

  Moreover, since the pressure to the saddle member 4 is performed in the range of 0.03 MPa to 0.1 MPa, and the heating is performed in the range of 60 ° C. to 130 ° C., the curved plate portion 1 of the saddle member 4 made of thermoplastic resin is already installed. While closely contacting the inner surface of the tube 5, the short cylindrical portion 3 can be efficiently expanded in diameter. In addition, by setting the pressurizing range, the expansion member 17 of the mounting machine 15 can be operated without being damaged, and the short cylindrical portion 3 of the saddle member 4 can be reliably brought into close contact with the inner surface of the rehabilitation pipe 8. Can perform excellent rehabilitation.

  In addition, since the short cylindrical portion 3 of the saddle member 4 is heated while being pressurized with an air plug with a built-in heater, the saddle member 4 can be attached to the attachment pipe port 7 with a conventionally used air plug. Further, by softening the saddle member 4 made of thermoplastic resin by heating the heater, the curved plate portion 1 of the saddle member 4 can be deformed to fit the inner surface of the existing main pipe 5, and the short cylindrical portion of the saddle member 4 3 can be deformed (expanded) so as to be in close contact with the rehabilitation pipe 8.

It is side surface sectional drawing for description which shows one Embodiment of the rehabilitation method of the attachment pipe port which concerns on this invention. It is side surface sectional drawing for description which shows the state which heat-expanded the rehabilitation pipe | tube in the existing attachment pipe | tube. It is side surface sectional drawing for description which shows the state which cut | disconnects the edge part of a rehabilitation pipe | tube. It is side surface sectional drawing for description which shows the state before attaching a saddle member to a rehabilitation pipe | tube. It is a principal part expanded side surface sectional view which shows the state which mounted the saddle member on the attachment machine. It is a principal part expanded side sectional view which shows the state which pressed the saddle member against the existing main pipe. It is a principal part expanded side surface sectional view which shows the state which pressed the short cylindrical part of the saddle member on the inner surface of the rehabilitation pipe | tube by the expansion member. It is side surface sectional drawing for description which shows the state which aligns a saddle member with the existing installation pipe | tube. It is a side view which shows an attachment machine (sticking machine). It is a perspective view which shows a saddle member. It is explanatory drawing which shows the conventional rehabilitation construction method, Comprising: It is side sectional drawing for description which shows the state before attaching a saddle member to a rehabilitation pipe | tube. It is explanatory drawing which shows the conventional rehabilitation construction method, Comprising: It is side surface sectional drawing for description which shows the state which draws in a rehabilitation pipe | tube into an existing attachment pipe. It is explanatory drawing which shows the conventional rehabilitation method, Comprising: It is side surface drawing for description which shows the state which heat-expanded the rehabilitation pipe | tube in the existing attachment pipe | tube. It is explanatory drawing which shows the conventional rehabilitation construction method, Comprising: It is side surface sectional drawing for description which shows the state which cut | disconnects the edge part of a rehabilitation pipe | tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Curved plate part 2 Hole part 3 Short cylindrical part 4 Saddle member 5 Existing main pipe 6 Existing installation pipe 7 Installation pipe port 8 Rehabilitation pipe 9 End part

Claims (3)

Provided with a saddle member made of a thermoplastic resin formed of a curved plate portion and a short cylindrical portion projecting around a hole portion of the curved plate portion, and the above-mentioned mounting pipe port for connecting an existing mounting pipe to an existing main pipe, It is a rehabilitation method of the mounting pipe port to which the saddle member is attached,
After the rehabilitation pipe is drawn into the existing mounting pipe and attached, the portion of the rehabilitation pipe that protrudes toward the existing main pipe is cut, and then the short cylindrical portion formed to have a smaller diameter than the inner diameter of the end of the rehabilitation pipe. By inserting into the end of the rehabilitating pipe from the existing main pipe side and heating the short cylindrical part while applying pressure from the inside, the diameter of the short cylindrical part is expanded with respect to the inner surface of the end of the rehabilitating pipe. Rehabilitation method of the mounting pipe opening, which is characterized by being closely attached.   The attachment pipe port rehabilitation method according to claim 1, wherein the saddle member is pressurized in a range of 0.03 MPa to 0.1 MPa and heated in a range of 60 ° C to 130 ° C.   The rehabilitation method for an attachment pipe port according to claim 1 or 2, wherein the short cylindrical portion of the saddle member is heated while being pressurized with an air plug incorporating a heater.

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