JP6472923B1 - Lining method - Google Patents

Abstract

Even a longitudinal pipe 1 having a sorbent joint 3 enables lining by a pipe-in-pipe method.
SOLVENT FITTING 3 is provided with a hole 10 penetrating the inside and outside. In the pasting step, a guide 9 is inserted from the hole 10 so that the leading end of the impregnated woven fabric 2 advances toward the main flow lowering region 5a. The impregnated woven fabric 2 is guided to Thus, when the impregnated woven fabric 2 is advanced from the lower side of the vertical tube 1 while reversing the inner and outer peripheries, the top of the impregnated woven fabric 2 hits the lower end 6a of the partition plate 6 inside the sovent joint 3, and the upper It is possible to prevent the progress to the process from being hindered. For this reason, even the longitudinal pipe 1 having the sovent joint 3 can be lined by a pipe-in-pipe method.
[Selection] Figure 4

Description

  The present disclosure relates to a lining method for rehabilitation by forming a liner layer on the inner periphery of a building drainage pipe, etc., for example, in a drainage system such as a sectioned condominium and the like, which is a common part that penetrates each floor in the height direction. The present invention relates to a technique for forming a liner layer on the inner wall of a pipe.

Conventionally, a pipe-in-pipe system that can serve both as rehabilitation of piping and seismic reinforcement has been known for the lining of piping as described above.
According to this pipe-in-pipe method, first, a cylindrical woven fabric having a length ranging from several tens of meters to several tens of meters according to the pipe length is prepared, and a molten state is prepared on this long woven fabric. An impregnated woven fabric impregnated with a resin material (for example, a mixture of an epoxy resin prepolymer and a curing agent) is provided. Then, this impregnated woven fabric is adhered to the inner wall of the pipe while the inner and outer circumferences are reversed by pressurizing with pressurized air, etc. while the resin material is kept sticky, and the resin material is cured. (For example, refer to Patent Documents 1 and 2.)

  As a result, the FRP pipe is separately attached to the inner circumference of the existing pipe such as metal, and it can also serve as an anti-seismic reinforcement along with the rehabilitation of the pipe. . Moreover, a higher-strength liner layer can be formed by using reinforcing fibers such as glass fibers and carbon fibers as a material for the cylindrical woven fabric.

  By the way, in recent years, many vertical pipes of common parts such as condominiums to be rehabilitated incorporate a joint called a sovent joint. This sovent joint forms an internal space having a predetermined volume at the connecting portion between the vertical pipe as a shared part and the horizontal branch pipe as a private part, and has flowed down in the vertical direction by partitioning the internal space in the vertical direction. Prevent the drainage from flowing into the side branch pipe. 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 tube while reversing the inner and outer peripheries, the leading end of the impregnated woven fabric hits the lower end of the partition plate inside the vent joint, and the upward progress is prevented.
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 2004-291605 A 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 this indication forms a liner layer in the inner wall of the vertical pipe which penetrates each floor of a building in the height direction. And the lining method of this indication is equipped with the following impregnation process and a sticking process. First, in the impregnation step, a tubular woven fabric having a length corresponding to the length of the vertical pipe is impregnated with a molten resin material. Next, in the affixing step, the impregnated woven fabric obtained in the impregnation step is vertically oriented from the opening end of the vertical tube toward the upper side of the vertical tube while inverting the inner and outer circumferences while the resin material remains adhesive. Adhering to the inner wall of the vertical pipe while entering the inner periphery of the pipe.

Here, the following Sovent joint is incorporated in the connection part of a vertical pipe and a horizontal branch pipe. That is, in the Sovent joint, an internal space having a predetermined volume is formed and a partition plate that partitions the internal space in the vertical direction is provided, and the partition plate allows the fluid that flows down the vertical pipe to flow into the internal space. To flow into.
Then, a hole that penetrates the inside and outside is provided in the Sovent joint, and in the pasting process, a guide is inserted through the hole, and the leading portion of the impregnated woven fabric is located in the region that is divided by the partition plate by the guide toward the longitudinal tube. Guide the impregnated woven fabric as it progresses.
As a result, the lining method of the present disclosure has an effect of potentially enabling lining by a 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 explanatory drawing which shows the state which fixed the one end of the impregnation woven fabric to the opening end of a vertical pipe, (b) is explanatory drawing which shows a mode that an impregnating woven cloth advances the inner periphery of a vertical pipe. There is (Example). It is sectional drawing which shows the inside of a Sovent joint (Example). It is explanatory drawing which shows a mode that an impregnation woven fabric is guide | induced to the mainstream down area | region with a guide (Example). It is sectional drawing which shows the inside of a Sovent joint (modification).

  The mode 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 is rehabilitated by forming a liner layer on the inner wall of the vertical pipe 1. Here, the building is, for example, a sectioned condominium, etc., and the vertical pipe 1 to be rehabilitated is a pipe that drains downward in the vertical direction in the drainage system through which household drainage flows. Make up 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 molten resin material to the inner wall of the pipe and curing it. .

Next, the lining method will be described.
The lining method according to the embodiment is based on a pipe-in-pipe method in which FRP pipes are attached to the inner periphery of a metal pipe so that both pipe rehabilitation and seismic reinforcement can be performed.
The lining method by the pipe-in-pipe method includes the following impregnation process and sticking process.

  First, in the impregnation step, a tubular woven fabric having a length corresponding to the length of the vertical tube 1 is impregnated with a molten resin material. 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 several tens of meters to several tens of meters depending on the length of the vertical tube 1. Further, reinforcing fibers such as glass fibers and carbon fibers are used as the material of the woven fabric.

Further, in the impregnation process, for example, by dropping a resin material on the inner surface of the woven fabric and applying force by sandwiching it with a roller or the like from the outside, the woven fabric is fed to the woven fabric by feeding it in the length direction. The resin material is impregnated (hereinafter, the woven fabric impregnated with the molten resin material is referred to as the impregnated woven fabric 2). Then, the impregnated woven fabric 2 is incorporated in a supply device 2S for supplying the impregnated woven fabric 2 in a state where the impregnated woven fabric 2 is wound around a predetermined winder 2a (see FIGS. 1 and 2). Provided to.
The supply device 2S includes a blower 2b that supplies pressurized air, a winder 2a around which the impregnated woven fabric 2 is wound, and a housing 2c that forms a passage for pressurized air. Further, the outlet for the pressurized air in the housing 2 c also serves as the outlet for the impregnated woven fabric 2.

Next, in the attaching step, the impregnated woven fabric 2 is attached to the inner wall of the vertical tube 1 while inverting the inner and outer peripheries of the impregnated woven fabric 2. Note that the inner wall of the vertical tube 1 is previously cleaned to remove dirt. Hereinafter, the sticking process 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 tube 1. At this time, the entire circumference of one end of the impregnated woven fabric 2 is folded inward and outward, and the entire circumference exposed to the outer peripheral side is fixed to the entire circumference of the open end. As a result, the open end 1a is sealed by one end of the impregnated woven fabric 2 whose inside and outside are folded back (see FIG. 2A).

In this state, for example, pressure air is supplied from the blower 2b toward the end of the impregnated woven fabric 2 that blocks the open end 1a. Thus, the impregnated woven fabric 2 is continuously drawn out from the winder 2a and enters the inner periphery of the vertical tube 1 toward the upper side of the vertical tube 1 while inverting the inner and outer periphery (FIG. 2B). reference.). Thereby, the impregnated woven fabric 2 is attached to the inner wall of the vertical tube 1. The pressure air outlet and the open end 1a of the housing 2c are connected by a supply pipe 2d forming a pressure air supply path.
Then, warm water is poured over 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 when the FRP pipe is separately attached to the inner periphery of the existing metal vertical pipe 1, and it can also serve as a seismic reinforcement along with the rehabilitation of the vertical pipe 1. .

[Features of Examples]
The characteristics of the lining method of the embodiment will be described.
The vertical pipe 1 to which the lining method of the embodiment is applied includes a sovent joint 3 (see FIG. 3). The sorbent joint 3 forms a connecting portion between the vertical pipe 1 as a shared part and the lateral 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 the vertical direction (vertical direction) is provided. The partition plate 6 prevents the fluid flowing down the vertical tube 1 and flowing into the internal space 5 from flowing into the horizontal support tube 4a.

Hereinafter, the Sovent joint 3 of an Example is explained in full detail.
The partition plate 6 extends downward from an upper plate portion 7 that defines the upper side of the internal space 5, and divides the upper region of the internal space 5 into the following two regions. In other words, 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 flow lower 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 tube 1 is bent and connected in a substantially S shape to a portion 7a of the upper plate portion 7 that forms the main flow lowering region 5a, and the inner periphery of the upper vertical tube 1 is the main flow down It opens to the region 5a. Further, the lower region 5c is reduced in diameter toward the inner diameter of the lower vertical tube 1, and the inner periphery of the lower vertical tube 1 opens at the lower end of the lower region 5c. .

  Of the two laterally supporting tubes 4a and 4b, the inner periphery of one laterally supporting tube 4a is open to the other region 5b, and the inner periphery of the other laterally supporting tube 4b is open to the lower region 5c. . For this reason, the inner periphery of one side branch pipe 4a is prevented from flowing in by the partition plate 6 from the main flow lowering region 5a. Note that the other lateral branch pipe 4b is bent, for example, upward on the upstream side of the position where the lower side area 5c opens, so that the fluid flowing into the lower area 5c from the mainstream lower area 5a is The branch pipe 4b is prevented from entering the upstream side of the bend.

  Further, the partition plate 6 is bent while extending downward from the upper plate portion 7, and the portion above the bending position is inclined so as to approach the side plate portion 8 a on the side of the mainstream lower region 5 a toward the lower side. The lower portion is inclined so as to approach the side plate portion 8b on the other region 5b side toward the lower side. The side plate portion 8a is parallel to the lower portion of the partition plate 6.

Next, the characteristics of the lining method will be described (see FIG. 4).
In the attaching step of the lining method of the embodiment, in the internal space 5, the impregnated woven fabric 2 is guided by the guide 9 so that the top of the impregnated woven fabric 2 that has progressed to the lower region 5c proceeds toward the mainstream lower region 5a. Adjust the direction of the head of the. Therefore, before the attaching step, a hole 10 penetrating the inside and outside is provided in the vent joint 3 in advance. The hole 10 in the embodiment is provided in the portion 7b of the upper plate portion 7 in the wall forming the other region 5b.

  Then, the guide 9 is inserted from the hole 10 to guide the leading end of the impregnated woven fabric 2 toward the main flow down region 5a. More specifically, the guide 9 is, for example, a plate 9A, and between the lower end 6a of the partition plate 6 and the upper end of the lower vertical tube 1 (hereinafter, referred to as a confluence opening 11). Yes.) That is, the plate 9 </ b> A is provided in a size that can block the merging opening 11.

As a result, the leading end of the impregnated woven fabric 2 cannot be directed toward the other region 5b by the plate 9A, but is guided toward the mainstream falling region 5a.
Further, in the sticking step, the inner periphery of the longitudinal tube 1 is sucked under a negative pressure above the top of the impregnated woven fabric 2, thereby assisting the head of the impregnated woven fabric 2 to advance toward the main flow lowering region 5a. To do.

  In addition, the inside of the inner wall surface of the part 7a and the periphery of the inner peripheral opening of the upper vertical tube 1 are formed with a recess 7d so that the impregnated woven fabric 2 is difficult to stick. On the other hand, by impregnating the impregnated woven fabric 2 with pressure air from below, the impregnated woven fabric 2 can be reliably adhered to the wall surface forming the recess 7d.

  Thereafter, after the impregnated woven fabric 2 is attached to the necessary range in the entire inner peripheral wall of the vertical tube 1, the plate 9A is pulled out from the hole 10, and after the resin material is cured, The part blocking 11 is cut off and removed. Further, a resin material is inserted from the hole 10 and painted on the wall surface to which the impregnated woven fabric 2 has not adhered, for example, the inner wall forming the other region 5b.

[Effects of Examples]
According to the lining method of the embodiment, the hole 10 penetrating the inside and outside is provided in the sovent joint 3, and in the attaching step, the guide 9 is inserted from the hole 10, and by the guide 9, the impregnated woven fabric 2 is moved toward the main flow lowering region 5 a. The impregnated woven fabric 2 is guided so that the head advances.
Thus, when the impregnated woven fabric 2 is advanced from the lower side of the vertical tube 1 while reversing the inner and outer peripheries, the top of the impregnated woven fabric 2 hits the lower end 6a of the partition plate 6 inside the sovent joint 3, and upwards. Can be prevented from being hindered. For this reason, even the longitudinal pipe 1 having the sovent joint 3 can be lined by a pipe-in-pipe method.

Moreover, the hole 10 is provided in the part 7b of the upper board part 7 among the walls which form the other area | region 5b. Thereby, it becomes easy to insert the guide 9 into the internal space 5.
Further, in the sticking process, the inner circumference of the vertical pipe 1 is sucked with a negative pressure to assist the leading of the impregnated woven fabric 2 to advance toward the main flow lowering region 5a. 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, a liner layer can also be formed on the inner wall forming the other region 5b. Moreover, since the hole 10 provided for inserting the guide 9 is used, it is not necessary to provide another hole in order to form 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 the two lateral branch pipes 4a and 4b are connected to the sovent joint 3 of the embodiment, the present invention is also applied to the case where the sovent joint 3 has one or three or more lateral branch pipes 4. Can do.

  Moreover, although the partition plate 6 of the Example was bent in the middle, you may provide the partition plate 6 in parallel with an up-down direction, without bending (refer 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 located on the side plate on the side of the other region 5b toward the lower side. You may make it incline so that the part 8b may be approached.

Further, the hole 10 of the embodiment was provided in the portion 7b of the upper plate portion 7 in the wall forming the other region 5b, but provided in the wall other than the portion 7b in the wall forming the other region 5b. It may be provided on the wall forming the lower region 5c.
Further, the guide 9 of the embodiment uses the plate 9A that closes the merging opening 11. However, for example, a balloon that deforms flexibly according to the surface that the outer surface of the guide 9 hits 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 tube 1 by supplying pressurized air, but the impregnated woven fabric is reduced by reducing the inner periphery of the vertical tube 2. The cloth 2 may enter the inner periphery of the vertical tube 1.

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

Claims (4)

In the lining method of forming a liner layer on the inner wall of the vertical pipe (1) that penetrates each floor of the building in the height direction,
An impregnation step of impregnating a tubular woven fabric having a length corresponding to the length of the vertical pipe with a molten resin material;
The impregnated woven fabric (2) obtained by this impregnation step is placed above the vertical tube while reversing the inner and outer periphery from the opening end (1a) of the vertical tube while the resin material is kept sticky. A sticking step for adhering to the inner wall of the vertical pipe while entering the inner periphery of the vertical pipe,
In the connection part 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 partitioning the internal space in the vertical direction is provided, and the partition plate flows down the vertical pipe and flows into the internal space. Incorporates a vent joint (3) that prevents fluid from flowing into the lateral branch;
A hole (10) penetrating the inside and outside of the sovent joint is provided,
In the affixing step, a guide (9) is inserted from this hole, and the main flow down region (5a) into which the fluid flowing down the vertical pipe flows in the region partitioned by the partition plate by the guide. A lining method, wherein the impregnated woven fabric is guided so that a leading portion of the impregnated woven fabric proceeds. The lining method according to claim 1,
The lining method, wherein the hole is provided in a wall that forms a region (5b) different from the main flow lowering region among regions partitioned by the partition plate in the Sovent joint. In the lining method of Claim 1 or Claim 2,
The lining method characterized in that, in the attaching step, the leading end of the impregnated woven fabric is advanced toward the mainstream lowering region by sucking the inner periphery 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 and coated on an inner wall forming a region different from the main flow lowering region in a region partitioned by the partition plate in the Sovent joint.

Images