WO2020144926A1

WO2020144926A1 - Pipe connection method and flange connection body

Info

Publication number: WO2020144926A1
Application number: PCT/JP2019/043522
Authority: WO
Inventors: 大栗林; 裕之柴田; 英祐若林
Original assignee: 日立Ｇｅニュークリア・エナジー株式会社
Priority date: 2019-01-07
Filing date: 2019-11-06
Publication date: 2020-07-16
Also published as: JP2020109308A

Abstract

This pipe connection method includes: a step for connecting one side of a connection member (7) and an end portion (2t) of a first pipe (2) having a flange surface (8), by means of a first lap joint flange (3, 3a) inserted into the first pipe (2) and a flange (3b) on the one side of the connection member, such that the flange surface (8) is sandwiched therebetween; and a step for connecting the other side of the connection member (7) and an end portion (5t) of a second pipe (5) having a flange surface (9), by means of a second lap joint flange (6, 6a) inserted into the second pipe (5) and a flange (6b) on the other side of the connection member, such that the flange surface (9) is sandwiched therebetween, while deforming the connection member (7) to absorb deflection.

Description

Pipe connection method and flange connection

The present invention relates to a pipe connection method and a flange connection body.

Conventionally, in domestic nuclear power plants, lining piping in which a lining material made of rubber or plastic is lined on the inner surface of a steel pipe is widely used for piping in seawater systems. On the other hand, in overseas nuclear power plants, HDPE (high density polyethylene) piping is often used.

The HDPE pipe is a pipe made of a material that has been used in general industries such as a water pipe, and Patent Document 1 describes that "a high-density polyethylene pipe (HDPE pipe) is adopted as an intake pipe".
Further improvement in reliability is required for using such HDPE piping in the nuclear industry.

Generally, it is considered that the location where the leakage potential of the internal fluid is the highest in the pipe system of the steel pipe is the flange connection point, and the same applies to the pipe system made of HDPE.
Therefore, in order for the HDPE piping system to meet the reliability demanded by the nuclear industry, it is essential to improve the reliability of the HDPE flange connection point.

Flange connection points in the HDPE piping system are points that require maintenance and points where the material is switched to steel pipes. At the flange connection point, they are connected by a kind of loose flange called a lap joint flange.

JP-A-2016-69983 (FIG. 1, paragraph 0014, etc.)

By the way, in the piping flange fastening structure, in order to prevent leakage of internal fluid from the flange fastening part, it is effective to keep them parallel to increase the degree of adhesion of the facing flange surfaces before tightening the bolts for connection. is there. This is difficult because flanges made of resin such as HDPE (High Density Polyethylene) are more flexible than steel pipes.

Therefore, conventionally, the following two measures have been taken.
As a measure 1, the flange surfaces facing each other are corrected in parallel and a large bolt tightening torque sufficient to secure the sealing property is applied to a part of the bolts.

As Countermeasure 2, in order to support the deflection of the pipe and keep the flange surfaces parallel, as shown in FIG. 6, supports 101, 104, 116, 117 are arranged before and after the

flanges

103, 106. FIG. 6 is a diagram showing an example of a connected state of a conventional pipe.

FIG. 7: is a figure which shows the other example of the connection state of the conventional piping.
Countermeasure 1 is tightening the bolt 115 shown in FIG. 7 with excessive torque to the flange portion in the bent state shown in FIG. 2 to be described later, so that the surface pressure is not evenly applied, resulting in partial tightening. there is a possibility. The tightening torque by the bolt 115 includes torque for reducing the distance between the

flanges

102a and 105a and torque for fixing the downwardly bent flange 102a and the flange 105a.

Further, such a large torque causes a tensile load to be applied to the lower side of the downwardly bent pipe 102 or the downwardly bent pipe 105 by tightening the bolt 115 in FIG. 7, for example. .. Therefore, due to the characteristics of resin such as HDPE (long-term structural soundness deteriorates as the operating temperature rises and the applied load increases like creep deformation of metal), unintentional deformation of the resin pipe flange fastening body / May cause damage.

In the countermeasure 2 shown in FIG. 6, the number of

supports

101, 104, 116, 117 increases, and routing of resin pipes such as HDPE to narrow spaces may become difficult.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe connecting method and a flange connecting body that do not require an excessive torque and improve the sealing performance.

In order to solve the above-mentioned problems, a method for connecting pipes according to a first aspect of the present invention is to connect end portions of a first pipe and a second pipe that are held in a horizontal direction so as to face each other in a state where a bend may occur. A method of connecting pipes by flange connection through a deformable connecting member. This method of connecting pipes includes one end of the first pipe having a flange surface and one side of the connecting member, one of a first lap joint flange inserted into the first pipe and one of the connecting members. And a flange on the other side, and a step of connecting so as to sandwich the flange surface, and the other end of the second pipe having a flange surface and the other end of the connecting member while deforming the connecting member to absorb the deflection. And a second lap joint flange inserted into the second pipe and a flange on the other side of the connecting member so as to sandwich the flange surface.

The pipe connecting method according to the second aspect of the present invention is a pipe connecting method in which the ends of the first pipe and the second pipe, which are held so as to be opposed to each other in a state where bending may occur in the horizontal direction, are flange-connected. Is the way. A pipe portion having a deformability is provided at an end portion of the first pipe, and in the pipe connecting method, the pipe portion of the first pipe is deformed to absorb the deflection, Including the step of connecting with a flange.
Other solutions will be described later.

According to the present invention, it is possible to provide a pipe connecting method and a flange connecting body which do not require an excessive torque and improve the sealing performance.

The figure which shows the connection state of the piping of Embodiment 1 which concerns on this invention. The figure which shows the piping state before the piping of Embodiment 1 is connected. FIG. 6 is a diagram showing a connected state of the pipe of the second embodiment. The figure which shows the connection state of the piping of Embodiment 3. The figure which shows the state before connection of the piping of Embodiment 3. The figure which shows the connection state of the piping of the modification of Embodiment 3. The figure which shows the state before connection of the piping of the modification of Embodiment 3. The figure which shows an example of the connection state of the conventional piping. The figure which shows the other example of the connection state of the conventional piping.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
The present invention relates to a flexible pipe connection method, and relates to the fields of resin pipes, flanges, and pipe designs.

<<Embodiment 1>>
FIG. 1 is a diagram showing a connection state of the

pipes

2 and 5 according to the first embodiment of the present invention, and shows a flange connection body T1 in which the

pipes

2 and 5 are connected.
The flange connection body T1 of the first embodiment includes a pipe 2 and a lap joint flange 3 on one side, a pipe 5 and a lap joint flange 6 on the other side, and a flexible joint 7 between the lap joint flange 3 and the lap joint flange 6. Equipped with.

The pipe 2 is a pipe made of resin such as HDPE (high density polyethylene) pipe. The pipe 2 is supported by the support 1 from below. That is, the pipes 2 are held so as to be opposed to each other in a horizontal direction in a state where the pipe 2 may be bent. This bending also occurs when the pipe 2 is supported by being hung and held. It should be noted that horizontal is not required to be strictly horizontal. This is because the pipe 2 may be bent even at an angle. This point is the same in the pipe 5.
The lap joint flange 3 is also called a loose flange or a loose flange, and in the present embodiment, the lap joint flange 3 is provided at the end 2 of the pipe 2. In FIG. 1, the lap joint flange 3 (first flange 3a) is connected to the second flange 3b via a plurality of bolts b1.

The pipe 5 is a resin pipe such as an HDPE pipe. The pipe 5 is supported by the support 4 from below. That is, the pipe 5 is also held in the horizontal direction in a state where it is bent. This deflection also occurs when the pipe 5 is supported by being suspended and held.
The lap joint flange 6 is also a loose flange similar to the above-mentioned lap joint flange 3, and in the present embodiment, the lap joint 6 is provided at the end 5t of the pipe 5. In FIG. 1, the lap joint flange 6 (first flange 6a) is connected to the second flange 6b via a plurality of bolts b2.

As shown in FIG. 1, the flexible joint 7 has two second flanges indicated by

reference numerals

3b and 6b and a tube body having deformability.
The flexible joint 7 is connected to the pipe 2 on one side by the second flange 3b on one side of the flexible joint 7 and the lap joint flange 3 (first flange 3a). The flexible joint 7 is connected to the pipe 5 on the other side by the second flange 6b on the other side of the flexible joint 7 and the lap joint flange 6 (first flange 6b). The pipe body of the flexible joint 7 communicates with each of the pipe lines of the

pipes

2 and 5 to allow a fluid to flow therethrough.
Note that the deformability of the tubular body here is a property of being deformed (changed in shape) by at least one mode such as bending, bending, stretching, and bending.

FIG. 2 is a diagram showing a state of the pipe before the pipe 2 and the pipe 5 of the first embodiment are connected. Note that, in FIG. 2, the same reference numerals as those in FIG.
A flange surface 8 having a hole through which the pipe of the pipe 2 is inserted is integrally formed with the end 2t of the pipe 2 on the pipe 2 on one side. Further, a flange surface 9 having a hole that is inserted into the conduit of the pipe 5 is formed integrally with the end 5t of the pipe 5 on the other side of the pipe 5.

A first flange 3a (lap joint flange 3) having a diameter larger than the flange surface 8 is inserted into the pipe 2 at the end portion 2t of the pipe 2 on one side and abuts against the end portion 2t (flange surface 8). Are locked.
A first flange 6a (lap joint flange) having a larger diameter than the flange surface 9 is inserted into the pipe 5 at the end portion 5t of the other side pipe 5 and abuts against the end portion 5t (flange surface 9). It is locked.

As shown in FIG. 2, since the pipe 2 on one side and the pipe 5 on the other side are installed horizontally, the pipe 2 and the pipe 5 are bent in the longitudinal direction (horizontal direction) due to their own weight or the like. Therefore, the flange surface 8 of the pipe 2 and the flange surface 9 of the pipe 5 are not parallel to each other.

ㆍPipe 2 and pipe 5 are connected as follows.

The second flange 3b (see FIG. 1) on one side of the flexible joint 7 is fitted to the flange surface 8 of the pipe 2 in the state shown in FIG. 2 so that the conduit of the pipe 2 and the conduit of the flexible joint 7 are aligned with each other. To abut. Then, the lap joint flange 3 (first flange 3a) and the second flange 3b are fastened with a plurality of bolts b1 so as to sandwich the flange surface 8, thereby connecting one side of the flexible joint 7 to the pipe 2. ..

As shown in FIG. 1, the second flange 6b on the other side of the flexible joint 7 is fitted to the flange surface 9 of the pipe 5 so that the pipeline of the pipe 5 and the pipeline of the flexible joint 7 are aligned with each other. Abut. Then, the lap joint flange 6 (first flange 6a) and the second flange 6b are fastened with a plurality of bolts b2 so as to sandwich the flange surface 9, thereby connecting the other side of the flexible joint 7 to the pipe 5. ..

Then, a gasket (not shown) provided between the flange surface 8 and the flexible joint 7 is tightened with the bolt b1 and pushed by the lap joint flange 3 (first flange 3a) and the second flange 3b. Apply surface pressure. Further, a gasket (not shown) arranged between the flexible joint 7 and the flange surface 9 is tightened with the bolt b2 and pushed by the lap joint flange 6 (first flange 6a) and the second flange 6b. Apply surface pressure.

Even if the tightening torque of the bolt b1 and the tightening torque of the bolt b2 are loaded by deforming the flexible joint 7 having flexibility (deformability) provided between the pipe 2 and the pipe 5, FIG. As shown in, the orientations of the flange surface 8 of the pipe 2 on the one side and the flange surface 9 of the pipe 5 on the other side do not change. Then, as shown in FIG. 1, the pipe 2 and the pipe 5 can be connected.
That is, at the time of this connection, the pipe 2 (tube body) of the flexible joint 7 is deformed by at least one of bending, bending, expansion and contraction, and is held in the horizontal direction, and the pipe 2 is generated. The bending in the longitudinal direction of the pipe 5 is absorbed.

Further, the tightening torque of the loaded bolt b1 and the tightening torque of the bolt b2 are not distributed because the directions of the flange surface 8 and the flange surface 9 are changed. Therefore, evenly distributed loads due to the fastening force of the bolt b1 and the fastening force of the bolt b2 are applied to the flange surface 8 of the pipe 2 and the flange surface 9 of the pipe 5 shown in FIG. 2, respectively. As a result, the flange connection in which the surface pressure is evenly applied to the flange surfaces 8 and 9 is facilitated.

Therefore, the sealing property can be secured without applying an excessive bolt tightening torque, and the sealing property is expected to be improved.
Further, since no bending load is applied to the

pipes

2 and 5, the structural reliability of the entire flange connector T1 is expected to be improved. Therefore, the piping support can be performed with the

few supports

1 and 4.

If each of the

pipes

2 and 5 is formed of HDPE, it is a thermoplastic resin and can be formed to have a high corrosion resistance such as seawater resistance.
Note that the flexible joint 7 may be replaced by a joint (expandable portion) having an expandable and contractible structure such as a bellows shape. In addition, the joint (expansion/contraction portion) having an expandable/contractible structure is formed with a conduit that is inserted into each conduit of the

conduits

2 and 5.

<<Embodiment 2>> FIG. 3 is a diagram showing a connection state of the

pipes

2 and 5 of Embodiment 2.

Next, the flange connector T2 according to the second embodiment of the present invention will be described with reference to FIG. Note that, in FIG. 3, the same reference numerals as those in FIGS. 1 and 2 indicate the same components, and thus the repetitive description will be omitted.

In the first embodiment shown in FIG. 1, in order to connect the pipe 2 and the pipe 5 without changing the orientation of the surfaces of the flange surface 8 and the flange surface 9, that is, without correcting the deflection of the pipe 2 or the pipe 5 itself. The flexible joint 7 was used for the.

On the other hand, the connection method of the flange connector T2 of the second embodiment shown in FIG. 3 is the flange 12 provided at the end of the flexible portion 10 fixed to the pipe 2 and the lap joint flange 6 attached to the pipe 5. It is done by connecting with.
The pipe 2 is made of a resin material such as HDPE.

In the flange connection body T2 of the second embodiment, the flexible portion 10 (a deformable pipe portion) is provided at the end of the pipe 2. The flexible portion 10 is formed with a conduit that is inserted (communicated) with the conduit of the pipe 2.
The flexible portion 10 is made of a flexible material such as rubber. When the flexible portion 10 is a rubber material, the pipe 2 made of a resin material and the flexible portion 10 made of a rubber material are connected by welding.

The flexible portion 10 may be a metal having a bellows structure other than a rubber material, a resin such as LDPE (low density polyethylene), or the like. The method of providing the flexible portion 10 at the end of the pipe 2 is performed by a general connecting method of resin material such as insert molding, welding, baking, etc. (The fluid flowing inside the pipe 2 does not leak. Connected in such a way).

As shown in FIG. 3, a flange 12 is fixed to the end of the flexible portion 10 connected to the pipe 2 (fixed in such a manner that the fluid flowing inside the pipe 2 does not leak). Exist).
A flange surface 9b having a diameter larger than that of the pipe 5 is formed integrally with the end of the pipe 5. The flange surface 9b is formed with a hole that is inserted (communicated) with the conduit of the pipe 5.

A lap joint flange 6 is inserted into the pipe 5 and is locked at the end of the pipe 5 (on the back side of the flange surface 9b). The inner diameter of the hole of the lap joint flange 6 is larger than the outer diameter of the pipe 5 and smaller than the outer diameter of the flange surface 9b. The outer diameter of the lap joint flange 6 is larger than the flange surface 9b.

The connection between the pipe 2 and the pipe 5 is performed as follows.
The flange 12 of the flexible portion 10 and the flange surface 9b of the pipe 5 are brought into contact with each other so that the pipeline of the flexible portion 10 and the pipeline of the pipe 5 are aligned with each other. Then, the flange 12 and the lap joint flange 6 are fastened and fixed with the bolt b3 so as to sandwich the flange surface 9b.

Then, a gasket (not shown) arranged between the flange 12 of the flexible portion 10 and the flange surface 9b of the pipe 5 is tightened with the bolt b3 and pushed by the flange 12 and the lap joint flange 6 to form a surface. Apply pressure.

In this way, as shown in FIG. 3, by deforming the flexible portion 10 connected to the pipe 2 and the pipe 5, a switching surface 11 between the pipe 2 and the flexible portion 10 and a flange surface 9b of the pipe 5 are formed. The pipe 2 and the pipe 5 can be connected without changing the direction.

As a result, the flange connection in which the surface pressure is evenly applied to the flange surface 9b of the pipe 5 is facilitated.
Therefore, the sealing property can be secured without applying an excessive bolt tightening torque, and the sealing property is expected to be improved.

Further, since no bending load is applied to the pipe 2 and the pipe 5, the structural reliability of the entire flange connector T2 is expected to be improved.
Therefore, pipe routing can be performed with a

few supports

1 and 4.

<<Embodiment 3>>
FIG. 4A is a diagram showing a connection state between the pipe 2 and the pipe 5 according to the third embodiment. FIG. 4B is a diagram showing a state before connecting the pipe 2 and the pipe 5 of the third embodiment.

Next, a third embodiment of the present invention will be described with reference to FIGS. 4A and 4B. Note that, in FIGS. 4A and 4B, the same reference numerals as those in FIGS.

In the flange connection body T1 of the first embodiment shown in FIG. 1, a flexible structure is provided for connecting the pipe 2 and the pipe 5 without changing the orientation of the surfaces of the flange face 8 of the pipe 2 and the flange face 9 of the pipe 5. The joint 7 was used.

On the other hand, in the flange connection body T3 of the third embodiment shown in FIG. 4A, the expansion/contraction part 13 (a deformable pipe part) is provided at the end of the pipe 2, and the expansion/contraction part 13 is deformed to form a straight pipe part. The piping 2 and the piping 5 are connected without changing the direction of the switching surface 14 between the 2 and the expansion/contraction portion 13 and the flange surface 9c of the piping 5.
The elastic portion 13 has a general elastic structure such as a bellows structure. The expandable portion 13 is formed with a conduit that is inserted into the conduit of the pipe 2.

As shown in FIG. 4B, one end of the expandable portion 13 is integrally formed at the end of the resin pipe 2 by a molding method of a thermoplastic resin such as injection molding or extrusion molding. The expandable portion 13 may have a bellows structure made of metal and may be insert-molded at the end of the resin pipe 2.
A flange surface 8c is integrally formed at the other end of the expandable portion 13. The flange surface 8c is formed with a conduit that is inserted (communicated) with the conduit of the expandable portion 13.

The flange 12 is attached to the inside of the flange surface 8c of the expandable portion 13. Incidentally, unlike the second embodiment, the flange 12 in the third embodiment is a lap joint flange (a loose flange), which is inserted into the expansion/contraction portion 13 and is locked on the back side of the flange surface 8c. .. A hole having a diameter smaller than the outer diameter of the flange surface 8c is formed in the center of the flange 12 through which the expandable portion 13 is inserted. The flange 12 has a larger outer diameter than the flange surface 8c.

As shown in FIG. 4B, a flange surface 9c is integrally formed at one end of the resin pipe 5. The flange surface 9c is provided with a hole that is inserted into the conduit of the pipe 5.
The lap joint flange 6 is attached to the inside of the flange surface 9c of the pipe 5. Supplementally, the lap joint flange 6 is inserted into the pipe 5 and locked on the back side of the flange surface 9c. In the lap joint flange 6, the pipe 5 is inserted and a hole having a diameter smaller than the outer diameter of the flange surface 9c is formed. The lap joint flange 6 has a larger outer diameter than the flange surface 9c.
That is, in the second embodiment (FIG. 3), the flange surface is one indicated by the reference numeral 9b, but in the third embodiment (FIGS. 4A and 4B), the flange surface is indicated by the

reference numerals

8c and 9c. There are two.

Connection between the pipe 2 and the pipe 5 is performed as follows. ‥

As shown in FIG. 4B, the flange surface 8c of the expandable portion 13 (a deformable tube body) connected to the end of the pipe 2 and the flange surface 9c of the pipe 5 are opposed to each other.
Thereafter, as shown in FIG. 4A, the flange surface 9c of the expandable portion 13 and the flange surface 8c of the pipe 5 are brought into contact with each other so that the conduit of the expandable portion 13 and the conduit of the pipe 5 are aligned with each other. Then, by fastening the plurality of bolts b4 to the flange 12 and the lap joint flange 6 so as to sandwich the flange surface 8c and the flange surface 9c in a state of being abutted with each other, the flange surface 8c of the expandable portion 13 and the pipe 5 are connected. The flange surface 9c is fixed.

Then, a gasket (not shown) arranged between the flange surface 8c of the expansion/contraction part 13 and the flange surface 9c of the pipe 5 is tightened with the bolt b4, and is pressed by the flange 12 and the lap joint flange 6 to bring the surface pressure. multiply.

With the above configuration, the tightening torque of the loaded bolt b4 is not distributed because the directions of the flange surfaces 8c and 9c are changed. Therefore, the flange surface 8c of the expansion/contraction part 13 and the flange surface 9c of the pipe 5 shown in FIG. 4A are evenly distributed by the fastening force of the bolt b4. As a result, the flange connection in which the surface pressure is evenly applied to the flange surface 8c of the expandable portion 13 and the flange surface 9c of the pipe 5 is facilitated.

Therefore, the sealing property can be secured without applying an excessive bolt tightening torque, and the sealing property is expected to be improved.
Further, since no bending load is applied to the pipe 2 and the pipe 5, the structural reliability of the entire flange connector T3 is expected to be improved.

<<Variations>>
FIG. 5A is a diagram showing a connection state of the

pipes

2 and 15 of the modified example of the third embodiment. FIG. 5B is a diagram showing a state before connecting the

pipes

2 and 15 of the modified example of the third embodiment.
The flange connection body T4 of the modified example has a configuration in which the pipe 15 and the flange 16 are integrally formed of metal. The other configurations are similar to those of the third embodiment, and therefore are denoted by the same reference numerals, and duplicate description will be omitted.
In the third embodiment (FIGS. 4A and 4B), the

loose flanges

6 and 12 are used, but in the modified example (FIGS. 5A and 5B), the loose lap joint flange 6 is used. The flange corresponding to is a normal flange 16 rather than a loose fit.

The flange 16 is formed with a hole through which the pipe of the pipe 15 is inserted.
The pipe 15 is supported by the support 4a from below.

The connection between the pipe 2 and the pipe 15 is performed as follows.

As shown in FIG. 5B, the flange surface 8c of the expandable portion 13 connected to the end portion of the pipe 2 and the flange 16 are opposed to each other.
After that, as shown in FIG. 5A, the flange surface 8c of the expandable portion 13 and the flange 16 are brought into contact with each other so that the pipeline of the pipe 2 and the pipeline of the pipe 15 are aligned with each other. Then, by fastening a plurality of bolts b5 to the flange 12 and the flange 16 of the pipe 15 so as to sandwich the flange face 8c, the flange face 8c of the expansion/contraction part 13 and the flange 16 of the pipe 5 are brought into contact with each other. Fix it.

Then, a gasket (not shown) provided between the flange surface 8c of the expansion/contraction part 13 and the flange 16 of the pipe 15 is tightened with the bolt b5, and the flange surface 8c of the expansion/contraction part 13 and the flange 16 of the pipe 15 are tightened. Press with and to apply surface pressure.

With the above configuration, the tightening torque of the loaded bolt b5 is not distributed to change the directions of the flange surface 8c and the flange 16, respectively. Therefore, an evenly distributed load due to the fastening force of the bolt b5 is applied to the flange surface 8c of the expandable portion 13 on one side and the flange 16 of the pipe 15 shown in FIG. 5A.

As a result, the flange connection in which the surface pressure is evenly applied to the flange surface 8c and the flange 16 becomes easy. Therefore, the sealing property can be secured without applying an excessive bolt tightening torque, and the sealing property is expected to be improved. Further, since no bending load is applied to the pipe 2 and the pipe 15, the structural reliability of the entire flange connector T4 is expected to be improved.

<<Other Embodiments>>
1. In the above-described embodiment, the material of the

pipes

2 and 5 has been described by taking HDPE as an example. However, if the characteristic 1 is a thermoplastic resin and the characteristic 2 is a resin having a high corrosion resistance such as seawater resistance, Hard vinyl chloride pipe pipes (PCV: polyvinyl chloride pipe), polyamide pipes (PA: polyamide plastic pipe), polypropylene pipes (PP: polypropylene pipe) other than HDPE may be used. A pipe formed by using a resin other than the above may be used.

2. In the above embodiment, the case where the gasket is used has been described, but the gasket may not be used.

3. It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are included. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those including all the configurations described. Further, it is possible to add, delete, or replace other configurations with respect to a part of the configurations of the respective embodiments.

1 support 2 piping (first piping)
2t end

part

3, 3a lap joint flange (first lap joint flange)
4 Support 5 Piping (Second piping)
5t

end

6, 6a lap joint flange (second lap joint flange)
7 Flexible joint (flexible part, expandable part, connecting member)
8 Flange surface 10 Flexible part (pipe part)
12 Lap joint flange, flange 13 Expansion/contraction part T1, T2, T3, T4 Flange connection body

Claims

A method for connecting pipes in which the ends of the first pipe and the second pipe, which are held so as to be opposed to each other in a state where bending may occur in the horizontal direction, are flange-connected via a connecting member having a deformability. hand,
An end of the first pipe having a flange surface and one side of the connecting member, a first lap joint flange inserted into the first pipe and a flange on one side of the connecting member, The process of connecting so that the flange surface is sandwiched,
A second lap joint in which the end portion of the second pipe having a flange surface and the other side of the connection member are inserted into the second pipe while deforming the connection member to absorb the deflection. And a flange on the other side of the connecting member so that the flange surface is sandwiched between the flange and the connecting member.
The pipe connecting method according to claim 1,
The connection member is
A flange connected to the first lap joint flange, a flange connected to the second lap joint flange, and a tubular body having deformability,
A method for connecting pipes, characterized in that, at the time of the connection, the pipe body is deformed by at least one mode of bending, bending, expansion and contraction, and the bending is absorbed.
A method of connecting pipes, which flange-connects the ends of the first pipe and the second pipe, which are held so as to be opposed to each other in a state in which a bend may occur, in a horizontal direction,
A pipe portion having deformability is provided at an end of the first pipe,
A method for connecting pipes, comprising the step of deforming the pipe portion of the first pipe to absorb the deflection and connecting with a flange.
The pipe connecting method according to claim 3,
A flange surface is provided at an end of at least one of the first pipe and the second pipe,
A method for connecting pipes, wherein the flange surface is sandwiched between the flanges for connection.
In the method for connecting pipes according to claim 3 or 4,
A method for connecting a pipe, wherein the pipe is deformed by at least one of bending, bending, stretching, and bending at the time of the connection so that the bending of the pipe is absorbed.
The pipe connecting method according to any one of claims 1 to 4,
At least one of the first pipe and the second pipe is a resin pipe,
A method for connecting pipes, wherein the bent state is achieved by supporting a part in the longitudinal direction.
A first pipe,
A second pipe having a deformable pipe portion at its end;
A lap joint flange that connects the first pipe and the second pipe.
The flange connection body according to claim 7,
The said deformability is flexibility and/or stretchability, The flange connection body characterized by the above-mentioned.
In the flange connection body according to claim 7 or 8,
At least one of the first pipe and the second pipe is a resin pipe,
A flanged connector characterized in that it is bent in a horizontal direction by being supported in part in the longitudinal direction, so that it is bent.