JP2020037197A - Lining method - Google Patents

Abstract

To enable lining by a pipe-in-pipe system even with a vertical pipe 1 provided with a Sovent joint 3.SOLUTION: A hole 10 passing through the inside and outside of a Sovent joint 3 is provided; a guide 9 is inserted from the hole 10; and an impregnation woven fabric 2 is guided so as to make a head of the impregnation woven fabric 2 advance in a direction of a mainstream lower area 5a by the guide 9. In this manner, the head of the impregnation woven fabric 2 abuts on a lower end 6a of a partition plate 6 in the inside of the Sovent joint 3, thereby being prevented from advancing upward, when advancing the impregnation woven fabric 2 while reversing inner/outer circumferences from a lower side of a vertical pipe 1. Therefore, lining is enabled by a pipe-in-pipe system even with the vertical pipe 1 provided with the Sovent joint 3.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a lining method of forming a liner layer on the inner periphery of a drain pipe or the like of a building and rehabilitating the lining method. The present invention relates to a technique for forming a liner layer on the inner wall of a pipe.

2. Description of the Related Art Conventionally, a pipe-in-pipe system capable of performing both rehabilitation and seismic reinforcement of a pipe has been known for the lining of the pipe as described above.
According to the pipe-in-pipe method, first, a tubular woven fabric having a length ranging from tens of meters to tens of meters according to the length of the pipe is prepared, and the molten woven fabric is formed on the long woven fabric. An impregnated woven fabric impregnated with a resin material (for example, a mixture of a prepolymer of an epoxy resin and a curing agent) is provided. Then, the impregnated woven cloth is adhered to the inner wall of the pipe while entering the inner circumference of the pipe while inverting the inner and outer circumferences by pressurizing with a pressurized air while the resin material is kept adhesive, and the resin material is cured. (For example, see Patent Documents 1 and 2).

  As a result, the structure is the same as that in which an FRP pipe is separately attached to the inner circumference of an existing pipe made of metal or the like, and it can also serve as seismic reinforcement together with rehabilitation of the pipe, and has been highly evaluated in recent years. . Further, by using a reinforcing fiber such as a glass fiber or a carbon fiber as a material of the tubular woven fabric, a liner layer having higher strength can be formed.

  By the way, in recent years, many vertical pipes of a common part such as an apartment to be rehabilitated incorporate a joint called a sovent joint. This Sovent joint forms an internal space having a predetermined volume at a connecting portion between a vertical pipe as a common part and a horizontal branch pipe as a private part, and flows down in the vertical direction by partitioning the internal space in the vertical direction. Prevent drainage from flowing into the lateral branch. For this reason, a partition plate is provided in the Sovent joint.

As a result, when the impregnated woven fabric is advanced from the lower side of the vertical pipe while reversing the inner and outer circumferences, the leading end of the impregnated woven fabric abuts the lower end of the partition plate inside the sovent joint, and the upward movement is hindered.
Therefore, there is a demand for a method that enables lining by a pipe-in-pipe method even for a vertical pipe having a sovent joint.

JP-A-2004-291605 JP 2009-006224 A

  An object of the present disclosure is to enable lining by a pipe-in-pipe method even in a vertical pipe having a sovent joint.

  The lining method of the present disclosure forms a liner layer on the inner wall of a vertical pipe penetrating each floor of a building in the height direction. The lining method of the present disclosure includes the following impregnation step and sticking step. First, in the impregnation step, a tubular woven fabric having a length corresponding to the length of the vertical pipe is impregnated with a resin material in a molten state. Next, in the sticking step, the impregnated woven fabric obtained in the impregnating step is vertically turned upward from the open end of the vertical pipe while inverting the inner and outer circumferences while the resin material is kept adhesive. It is attached to the inner wall of the vertical pipe while entering the inner circumference of the pipe.

Here, at the connection between the vertical pipe and the horizontal branch pipe, the following sovent joint is incorporated. That is, in the Sovent joint, an internal space having a predetermined volume is formed and a partition plate that vertically partitions the internal space is provided. The partition plate allows the fluid flowing down the vertical pipe and flowing into the internal space to flow into the horizontal branch pipe. To prevent it from flowing into.
Then, a hole penetrating the inside and outside of the sovent joint is provided, and in the sticking step, a guide is inserted from the hole, and by the guide, the top of the impregnated woven fabric is directed toward the region connected to the vertical pipe in the region partitioned by the partition plate. Guide the impregnated woven fabric as it proceeds.
As a result, the lining method of the present disclosure has an effect of potentially enabling lining by the pipe-in-pipe method even with a vertical pipe having a sovent joint.

It is a perspective view of an impregnated woven fabric (Example). (A) is an explanatory view showing a state in which one end of the impregnated woven fabric is fixed to an open end of the vertical pipe, and (b) is an explanatory view showing a state in which the impregnated woven cloth advances on the inner circumference of the vertical pipe. (Example) It is sectional drawing which shows the inside of a Sovent joint (Example). It is explanatory drawing which shows a mode that an impregnated woven fabric is guided toward the main flow down area by a guide (Example). It is a sectional view showing the inside of a Sovent joint (modification).

  Embodiments for carrying out the present disclosure will be described in detail with reference to the following examples.

[Configuration of Example]
The lining method of the embodiment is a method of rehabilitating the vertical pipe 1 penetrating each floor of the building in the height direction, and regenerating by forming a liner layer on the inner wall of the vertical pipe 1. Here, the building is, for example, a condominium-owned condominium, etc., and the vertical pipe 1 to be rehabilitated is a pipe in which drainage flows downward in the vertical direction in a drainage system in which domestic wastewater flows and is shared. Make up the part. Such rehabilitation of the vertical pipe 1 is performed, for example, at the time of large-scale repair by a management association, and the liner layer is formed by adhering a resin material in a molten state to the inner wall of the pipe and curing the resin material. .

Next, the lining method will be described.
The lining method of the embodiment is based on a pipe-in-pipe method in which an FRP pipe is attached to the inner periphery of a metal pipe so that the pipe can be rehabilitated and seismically reinforced.
The lining method by the pipe-in-pipe method includes the following impregnation step and sticking step.

  First, in the impregnation step, a tubular woven fabric having a length corresponding to the length of the vertical pipe 1 is impregnated with a resin material in a molten state. The resin material is, for example, a mixture of a prepolymer of an epoxy resin and a curing agent, and the woven fabric has a length ranging from tens of meters to tens of meters depending on the length of the vertical tube 1. In addition, reinforcing fibers such as glass fiber and carbon fiber are used as the material of the woven fabric.

In addition, in the impregnation step, for example, the resin material is dropped on the inner surface of the woven fabric, and the woven fabric is sent out in the length direction while applying a force while being sandwiched between the outer surfaces by a roller or the like. A resin material is impregnated (hereinafter, a woven fabric impregnated with a molten resin material is referred to as an impregnated woven fabric 2). Then, the impregnated woven fabric 2 is wound into a predetermined take-up device 2a (see FIGS. 1 and 2 and the like) and incorporated into a supply device 2S for supplying the impregnated woven fabric 2, and the next attaching step is performed. Provided to
The supply device 2S includes a blower 2b for supplying pressurized air, a housing 2c for accommodating a winder 2a around which the impregnated woven fabric 2 is wound, and forming a passage for pressurized air. The outlet of the compressed air in the housing 2c also serves as the outlet of the impregnated woven fabric 2.

Next, in the attaching step, the impregnated woven fabric 2 is attached to the inner wall of the vertical pipe 1 while the inner and outer peripheries of the impregnated woven fabric 2 are inverted. In addition, the inner wall of the vertical pipe 1 is previously cleaned to remove dirt. Hereinafter, the sticking step will be sequentially described.
First, one end of the impregnated woven fabric 2 is fixed to, for example, the lowermost open end 1 a of the vertical pipe 1. At this time, the entire circumference of one end of the impregnated woven fabric 2 is turned inward and outward, and the entire circumference exposed on the outer peripheral side is fixed to the entire circumference of the open end. As a result, the open end 1a is closed by one end of the impregnated woven fabric 2 whose inside and outside are turned back (see FIG. 2A).

In this state, for example, pressurized air is supplied from the blower 2b toward the end of the impregnated woven fabric 2 that closes the open end 1a. Thereby, the impregnated woven fabric 2 is continuously pulled out from the winder 2a and enters the inner circumference of the vertical pipe 1 upward of the vertical pipe 1 while reversing the inner and outer circumferences (FIG. 2 (b)). reference.). This causes the impregnated woven fabric 2 to adhere to the inner wall of the vertical pipe 1. In addition, the supply port 2d which forms a supply path of the compressed air is connected between the outlet of the compressed air in the housing 2c and the open end 1a.
Thereafter, hot water is caused to flow on the inner peripheral surface of the impregnated woven fabric 2 formed on the inner periphery of the vertical tube 1 to gradually cure the resin material.
As described above, it is possible to realize the same state as the case where the FRP pipe is separately attached to the inner periphery of the existing metal vertical pipe 1, and it is possible to rehabilitate the vertical pipe 1 and also serve as seismic reinforcement. .

[Features of the embodiment]
The features of the lining method of the embodiment will be described.
The vertical pipe 1 to which the lining method of the embodiment is applied incorporates a sovent joint 3 (see FIG. 3). The vent joint 3 forms a connection between the vertical pipe 1 as a common part and the horizontal branch pipes 4a and 4b as private parts.
In the vent joint 3, an internal space 5 having a predetermined volume is formed, and a partition plate 6 that partitions the internal space 5 in a vertical direction (up and down direction) is provided. The partition plate 6 prevents the fluid flowing down the vertical pipe 1 and flowing into the internal space 5 from flowing into the horizontal branch pipe 4a.

Hereinafter, the Sovent joint 3 of the embodiment will be described in more detail.
The partition plate 6 extends downward from the upper plate portion 7 that defines the upper side of the internal space 5, and divides the region above the internal space 5 into the following two regions. That is, the partition plate 6 divides the upper region of the internal space 5 into a main flow-down region 5a into which the fluid flowing down the vertical pipe 1 flows, and another region 5b different from the main flow-down region 5a. . In the internal space 5, the main downstream region 5 a and the other region 5 b communicate with each other via a lower region 5 c below the lower end 6 a of the partition plate 6.

  The upper vertical pipe 1 is bent in a substantially S-shape and connected to a portion 7a of the upper plate portion 7 which forms the main flow-down area 5a. It is open in the area 5a. Further, the lower region 5c is reduced in diameter downward to an inner diameter of the lower vertical tube 1, and an inner periphery of the lower vertical tube 1 is opened at a lower end of the lower region 5c. .

  Also, of the two horizontal branch pipes 4a and 4b, the inner circumference of one horizontal branch pipe 4a is open to the other area 5b, and the inner circumference of the other horizontal branch pipe 4b is open to the lower area 5c. . For this reason, the inner periphery of one lateral branch pipe 4a is prevented by the partition plate 6 from flowing fluid from the main flow-down region 5a. Since the other lateral branch pipe 4b is bent upward, for example, on the upstream side of the position opening to the lower region 5c, the fluid flowing from the main flow lower region 5a into the lower region 5c is not bent. The branch pipe 4b is prevented from entering the upstream side of the bend.

  Further, the partition plate 6 is bent in the middle of extending downward from the upper plate portion 7, and the portion above the bent position is inclined so that the lower side is closer to the side plate portion 8 a on the side of the main flow down region 5 a. The lower portion is inclined so that the lower portion is closer to the side plate portion 8b on the side of the other region 5b. The side plate portion 8a is parallel to the lower portion of the partition plate 6.

Next, the features of the lining method will be described (see FIG. 4).
In the sticking step of the lining method of the embodiment, the guide 9 causes the impregnated woven fabric 2 to move in the inner space 5 so that the head of the impregnated woven fabric 2 that has advanced to the lower region 5c advances toward the main flow-down region 5a. Adjust the heading direction at the beginning. Therefore, before the attaching step, a hole 10 penetrating the inside and outside of the sovent joint 3 is provided in advance. The hole 10 of the embodiment is provided in the portion 7b of the upper plate 7 in the wall forming the other region 5b.

  Then, the guide 9 is inserted through the hole 10 to guide the head of the impregnated woven fabric 2 toward the main flow-down region 5a. More specifically, the guide 9 is, for example, a plate 9 </ b> A, and the plate 9 </ b> A allows a space between the lower end 6 a of the partition plate 6 and the upper end of the lower vertical pipe 1 (hereinafter, referred to as a merge opening 11). There is.) That is, the plate 9 </ b> A is provided in a size that can close the merging opening 11.

Thereby, the head of the impregnated woven fabric 2 cannot be directed toward the other region 5b by the plate 9A, but is guided toward the main flow-down region 5a.
Further, in the attaching step, the inner circumference of the vertical pipe 1 is suctioned at a lower pressure than the top of the impregnated woven fabric 2 to assist the leading of the impregnated woven fabric 2 toward the main flow-down region 5a. I do.

  A recess 7d is formed around the inner peripheral opening of the upper vertical tube 1 in the inner wall surface of the portion 7a, so that the impregnated woven fabric 2 is difficult to stick. On the other hand, the impregnated woven fabric 2 can be reliably adhered to the wall surface forming the recess 7d by moving the impregnated woven fabric 2 upward while being pressed by the pressurized air from below.

  Then, after the impregnated woven fabric 2 is adhered to a necessary area of the entire inner peripheral wall of the vertical pipe 1, the plate 9A is pulled out from the hole 10, and after the resin material is cured, the confluence opening of the impregnated woven fabric 2 is opened. The part closing 11 is cut off and removed. In addition, a resin material is inserted through the hole 10 and painted on a wall surface on which the impregnated woven fabric 2 does not adhere, for example, an inner wall forming the other region 5b.

[Effects of the embodiment]
According to the lining method of the embodiment, a hole 10 penetrating the inside and outside of the sovent joint 3 is provided, and in the attaching step, a guide 9 is inserted from the hole 10, and the impregnated woven fabric 2 is guided by the guide 9 toward the main flow down area 5 a. The impregnated woven fabric 2 is guided so that the head advances.
Accordingly, when the impregnated woven fabric 2 is advanced from the lower side of the vertical pipe 1 while reversing the inner and outer circumferences, the leading end of the impregnated woven fabric 2 abuts on the lower end 6a of the partition plate 6 inside the sovent joint 3, and moves upward. Can be prevented from being hindered. For this reason, even in the vertical pipe 1 having the sovent joint 3, lining by the pipe-in-pipe method is possible.

The hole 10 is provided in the portion 7b of the upper plate 7 in the wall forming the other region 5b. This makes it easier to insert the guide 9 into the internal space 5.
In the sticking step, the leading end of the impregnated woven fabric 2 is assisted to advance toward the main flow-down region 5a by suctioning the inner circumference of the vertical pipe 1 under negative pressure. Thereby, the impregnated woven fabric 2 can be more reliably guided toward the main flow-down region 5a.

Further, a resin material is inserted into the inner wall forming the other region 5b from the hole 10 and painted.
Thereby, the liner layer can be formed also on the inner wall forming the other region 5b. Further, since the hole 10 provided for inserting the guide 9 is used, it is not necessary to provide another hole for forming the liner layer on the inner wall forming the other region 5b.

(Modification)
Various modifications of the present invention can be considered without departing from the gist thereof.
For example, although two lateral branch pipes 4a and 4b are connected to the sovent joint 3 of the embodiment, the present invention is also applicable to a case where the sovent joint 3 has one or three or more lateral branch pipes 4. Can be.

  Further, although the partition plate 6 of the embodiment is bent in the middle, the partition plate 6 may be provided in the vertical direction without bending (see FIG. 5). In this case, a portion of the side plate portion 8a that faces the partition plate 6 in the horizontal direction is provided in parallel with the partition plate 6, and a portion that does not face the partition plate 6 in the horizontal direction is a lower side plate closer to the other area 5b. You may incline so that it may approach the part 8b.

The hole 10 of the embodiment is provided in the portion 7b of the upper plate portion 7 in the wall forming the other region 5b, but is provided in the wall other than the portion 7b in the wall forming the other region 5b. Alternatively, it may be provided on a wall forming the lower region 5c.
In addition, although the plate 9A for closing the merging opening 11 is used as the guide 9 in the embodiment, for example, a balloon that is flexibly deformed according to the surface on which the outer surface of the guide 9 is applied may be used.
Furthermore, according to the lining method of the embodiment, the impregnated woven fabric 2 is caused to enter the inner periphery of the vertical pipe 1 by supplying the pressurized air. The cloth 2 may enter the inner circumference of the vertical pipe 1.

DESCRIPTION OF SYMBOLS 1 Vertical pipe 1a Open end 2 Impregnated woven fabric 3 Sovent joint 4a Horizontal branch pipe 5 Internal space 5a Main flow down area 6 Partition plate 9 Guide 10 Hole

Claims (4)

A lining method for forming a liner layer on an inner wall of a vertical pipe (1) penetrating each floor of a building in a height direction,
An impregnation step of impregnating the tubular woven fabric having a length corresponding to the length of the vertical pipe with a resin material in a molten state,
The impregnated woven fabric (2) obtained by this impregnation step is placed above the vertical pipe from the open end (1a) of the vertical pipe while the inner and outer peripheries are inverted while the resin material is kept adhesive. Attaching to the inner wall of the vertical pipe while entering the inner circumference of the vertical pipe toward,
At the connection between the vertical pipe and the horizontal branch pipe (4a),
An internal space (5) having a predetermined volume is formed and a partition plate (6) for vertically partitioning the internal space is provided, and the partition plate flows down the vertical pipe and flows into the internal space. A sovent joint (3) for preventing fluid from flowing into said lateral branch pipe is incorporated;
A hole (10) penetrating the inside and outside of the sovent joint,
In the sticking step, a guide (9) is inserted through the hole, and the guide is used to guide, toward the main flow-down area (5a) into which the fluid flowing down the vertical pipe flows in the area partitioned by the partition plate. A lining method comprising: guiding the impregnated woven fabric such that the leading end of the impregnated woven fabric advances. The lining method according to claim 1,
The lining method, wherein the hole is provided in a wall forming a region (5b) different from the main flow-down region in a region defined by the partition plate in the sovent joint. In the lining method according to claim 1 or 2,
The lining method according to claim 1, wherein, in the attaching step, the leading end of the impregnated woven fabric is advanced toward the main flow-down region by suctioning the inner circumference of the vertical pipe under a negative pressure. In the lining method according to any one of claims 1 to 3,
A lining method, wherein the resin material is inserted from the hole into the inner wall forming an area different from the main flow-down area in the area defined by the partition plate in the sovent joint, and painting is performed.

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