JPH0568721A - Piping method of piping for fluid - Google Patents

Abstract

PURPOSE:To provide a piping method by using one-touch type couplings. CONSTITUTION:A universal header 13 (one-touch type) is installed to a sprinkler auxiliary main pipe 11, and a copper flexible pipe 15A (with a one-touch type coupling) is piped from the flexible header 13. At the tip of the copper flexible pipe 15A, a sliding type self-sealing coupling 17 is installed, which is provided to the surface of a ceiling 650 (existing), and a sprinkler head 3 (existing) is installed. Almost all the couplings are made in a one-touch type or a one-touch type with self-sealing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides a water supply main pipe or a fluid supply pipe such as a sprinkler main pipe to provide a faucet or
The present invention relates to a plumbing method for fluid piping that supplies fluid to a device such as a sprinkler head.

[0002]

2. Description of the Related Art Conventionally, a piping method for fluid piping has used a screw-in type joint. In this piping method, almost all of the connection between the pipe and the joint, the connection between the joint and the instrument, etc., are engaged with the female joint structure having the tapered female screw and the male joint structure having the tapered male screw. It was a thing.

In addition, when the female joint structure and the male joint structure are fitted together, a liquid leak prevention treatment must be performed by using packing or seal tape. In this screw-in type, the female joint structure embedded in the wall or ceiling is fitted with the male joint structure of the device.

[0004]

However, in the conventional technique, since the waterproofing method using the packing and the sealing tape is used, the number of construction man-hours is large, and the technique and experience are required. Also, when attaching the sprinkler head to the ceiling surface or when attaching the faucet to the wall surface, the amount of protrusion of the throttle pipe or the take-out socket must be adjusted in order to adjust the finished surface. There were many problems.

Moreover, after the device is attached and the fluid is injected into the branch pipe, the main plug must be stopped and the liquid must be drained each time the device is replaced or a new branch pipe is added, which requires a lot of man-hours. At the same time, there was a risk of a liquid leakage accident. It is an object of the present invention to provide a piping construction method for a fluid piping, which requires less advanced technology and experience and can reduce the number of construction steps.

[0006]

[Means for Solving the Problems] As a means for achieving the above object, a method for piping a fluid pipe according to a first aspect of the present invention is a fluid supply pipe for branching a fluid supply pipe to supply a fluid to a fluid instrument. In the piping method of the pipe for use, the branch pipe joint for branching is connected to the supply pipe, the branch pipe joint is attached with the joint for the branch pipe joint at one end, and has a self-sealing mechanism at the other end, The gist is to connect a branch pipe to which a self-sealing joint having a sealing mechanism of a joint connecting portion is attached.

The piping method for the fluid piping of the second invention is the first
A gist of the invention is that a self-sealing joint with a branch has a self-sealing joint structure for branching. A pipe construction method for a fluid pipe according to a third aspect of the present invention includes a branch pipe for a feed pipe, which is formed by connecting a self-sealing joint with a branch to a self-sealing joint according to the first invention, or a self-sealing joint with a branch according to the second invention. The point is to connect them.

The piping method for the fluid piping of the fourth invention is the first
The gist is that the connection between the supply pipe and the branch pipe joint and the connection between the branch pipe joint and the branch pipe according to the invention, the second invention, or the third invention are performed by a one-touch joint.

[0009]

In the piping method for fluid piping of the first invention, a branch pipe joint is first connected to the fluid supply pipe, and then a joint attached to one end of the branch pipe is connected to this branch pipe joint. Next, the other end of the branch pipe is arranged up to the mounting position of the device for fluid, and the self-sealing joint is fixed thereto.

As a result, a branch pipe line from the fluid supply pipe to the self-sealing joint is formed. Further, in this state, the end of the branch pipeline is stopped, and the fluid can be injected into the branch pipeline. The self-sealing joint supplies fluid to the connected device when the device for fluid is connected, and prevents leakage of fluid from the joint connection part with the device. Also, removal of the device prevents fluid leakage from the terminal.

Therefore, according to the piping method for the fluid piping of the first aspect of the invention, the fluid can be injected up to the self-sealing joint for mounting the device when the piping is completed. In addition, the devices can be connected and disconnected with one touch without performing a waterproofing process or a draining work with a sealing tape or the like.

In the piping method for fluid piping of the second invention, since the branch self-sealing joint is attached to the end of the branch pipe, as shown in the third invention, the feed piping for supplying the fluid to other equipment. The branch pipe for can be attached with one touch. As a result, it is possible to perform the additional work of the appliance by only modifying a few places.

The piping method for the fluid piping of the third invention is the second one.
A branch pipe is connected to the self-sealing joint with a branch of the invention to form a feed pipe for supplying a fluid to another device. This allows branch pipes to be added without removing existing equipment or modifying existing pipes. In addition, a branch self-sealing joint is connected to the self-sealing joint according to the first aspect of the invention to form a feed pipe for supplying fluid to another device. As a result, it is possible to add a branch pipe without performing a major remodeling work of the existing pipe and without performing a water stop treatment or drainage of the terminal.

The piping construction method of the fluid piping of the fourth invention is the first
The connection between the supply pipe and the branch pipe joint and the connection between the branch pipe joint and the branch pipe according to the invention, the second invention, or the third invention are performed by a one-touch joint. As a result, the piping for the fluid can be installed without thread cutting or liquid sealing.

[0015]

[Embodiments] Next, embodiments of the piping method for fluid piping of the present invention will be described. FIG. 1 is a configuration diagram of a sprinkler piping system 1 configured by the piping method of this embodiment. The sprinkler piping system 1 is the existing sprinkler head 3
The state of adding a new sprinkler head 5 is shown in FIG.

First, the structure of the existing sprinkler head 3 will be described. The existing sprinkler piping system 1 includes a sprinkler sub-main pipe 11, a flexible header 13, a copper pipe flexible pipe 15A, 15B, 15C, 15D, 15E (simply referred to as 15 if not particularly distinguished), and a slide. A self-sealing joint 17 and a sprinkler head 3 are provided. The sprinkler sub-main pipe 11 is connected to a sprinkler main pipe (not shown), and a branched cheese 19 is provided in the middle of the pipe.

The universal header 13 includes branch joints 23A and 23A.
B, 23C, 23D and 23E (simply referred to as 23 when there is no particular need to distinguish). Flexible header 13
The branch joint 23C is one-touch connected to the female joint connecting portion 19a of the branch cheese 19. Flexible header 13
The detailed configuration of will be described later.

The copper pipe flexible pipe 15A has a male joint 25 shown in FIG. 2 attached to one end and a female joint 27 shown in FIG. 3 attached to the other end. Details will be described later. One end of the flexible pipe 15A made of copper pipe is connected to the universal header 13, and the other end thereof is connected to the slide type self-sealing joint 17. The flexible pipe 15A made of copper pipe is clipped to the ceiling base. Flexible tube made of copper tube 15B, 15D, 15E
Although not shown in FIG. 1, the flexible pipe 15 made of copper pipe
The configuration is almost the same as A.

The slide type self-sealing joint 17 is attached near the surface of the existing ceiling 640. The sprinkler head 3 is attached to a slide type self-sealing joint 17. Next, details of each unit will be described.

FIG. 4 is a partially broken exploded perspective view of the slide type self-sealing joint 17. FIG. 5 is a partial cross-sectional view of the slide type self-sealing joint 17. As shown in FIGS. 4 and 5, the slide type self-sealing joint 17 includes a pipe side member 123, a screw side member 125, and a tubular second member 127.
And a lock ring 129.

The pipe side member 123 includes a cylinder body 135, a male joint connecting portion 137, a taper screw portion 139, a first water supply passage 141, and a cylindrical hole portion 143. The cylinder body 135 is a metallic cylindrical member. Male joint connection part 1
37 is formed on one end portion 135 a of the cylinder body 135 and includes a protrusion member 138. There is. The taper screw portion 139 is formed on the other end portion 135b of the cylinder body 135. The first water supply channel 141 is formed from one end 135a to the other end 135b. The cylindrical hole 143 is formed from the other end 135b to the one end 135a side.

The screw-side member 125 has a female screw portion 147,
The taper female screw part 149 is provided. Female thread 147
The tubular second member 127 is screwed. The taper female screw part 149 is screwed into the taper screw part 139. As shown in FIG. 5, the pipe side member 123 and the screw side member 125 are
The cylindrical first member 151 is configured by being screwed together.

The tubular second member 127 has a diameter-expanded portion 153,
The male screw portion 155, the male joint connecting portion 157, and the second water supply passage 161 are provided. The enlarged diameter portion 153 is formed at the one end portion 127 a of the tubular second member 127. Expanded part 1
53, the outer peripheral surface 153a is slightly smaller than the cylindrical hole 143. The O-ring groove 15 is formed on the outer peripheral surface 153a.
3b is formed. An O-ring 163 is provided in the O-ring groove 153b. A quadrangular (or hexagonal) groove (not shown) is formed in the other end 127b of the cylindrical second member 127.
Are formed.

As shown in FIG. 5, in the cylindrical second member 127, the male screw portion 155 is screwed into the female screw portion 147 and the expanded diameter portion 153 is inserted into the cylindrical hole portion 143. 4 in this state
When the special tool is inserted into the square groove and the tubular second member 127 is rotated to the right, the tubular second member 127 turns into the tubular first member 151.
When moving inward and rotating counterclockwise, the tubular second member 127 moves in a direction of retracting from the tubular first member 151. That is, the protrusion amount of the tubular second member 127 with respect to the tubular first member 151 can be adjusted from below the ceiling 640 using a dedicated tool.

The lock ring 129 is formed by the tubular second member 12
It is screwed to 7. When the lock ring 129 is fastened to the tubular first member 151, the lock ring 129 fixes the tubular first member 151 and the tubular second member 127 to each other. Tubular second member 12
A fluid cutoff valve 171 is disposed in the second water supply passage 161 in No. 7. The fluid cutoff valve 171 includes a self-sealing valve seat 173, a self-sealing taper head 175, and
Self-sealing flange 177 and coil spring 1
79 and.

FIG. 6 is a partial sectional view of the taper head 175,
FIG. 7 is a partial sectional view of the flange 177. FIG. 8 is a left side view thereof. The valve seat 173 is integrally formed with the tubular second member 127, and is formed in a ring shape. The taper head 175 is formed by molding a metal that is harder than the valve seat 173, and includes a taper portion 175a and a cylindrical portion 175b. The tapered portion 175a includes a conical surface 175aa and a groove 175ab. The conical surface 175aa is a surface that comes into contact with the valve seat 173, and forms a so-called metal touch seal with each other. That is, initially, the edge portion 173a of the valve seat 173 is edge-processed and is in a sharp state. Here, conical surface 175
The aa comes into point contact to crush the edge portion 173a. As a result, the edge portion 173a conforms to the shape of the conical surface 175aa to form a liquid seal portion.

The flange 177 is a flange portion 177a.
And a cylindrical portion 177b and a male screw portion 177c. The flange portion 177a has a disc shape and has a groove 177a.
a. From the flange portion 177a to the column portion 177
A flow path 177d is formed over b. Channel 17
7d improves the flow of water by reducing the amount of the flow resistance of the flange portion 177a and the cylindrical portion 177b. The male screw portion 177c has a female screw hole 175.
It is to be combined with ba.

The coil spring 179 is interposed between the valve seat 173 and the flange 177, and applies an urging force in a direction of expanding the mutual space. Taper head 175 and flange 1
77, the coil spring 179 and the valve seat 173 are interposed between them, and they are fitted together as shown in FIG.

In the fluid cutoff valve 171 in the state shown in FIG. 5, the side surface of the male joint connecting portion 157 of the flange portion 177a constitutes the operating portion 181. When the operating portion 181 is pressed in the direction of arrow YA, the fluid cutoff valve 171 separates from the valve seat 173,
A fluid passage is formed. On the other hand, when the pressing on the operation portion 181 is released, the fluid cutoff valve 171 moves in the arrow YB direction, and the fluid passage is closed.

FIG. 9 is a partially cutaway perspective view of the male joint connecting portion 157, and FIG. 10 is a configuration view of the male joint connecting portion 157 as seen from the inserting direction.
The male joint connecting portion 157 includes an engagement piece insertion hole 191, a square groove 192, a peripheral groove 193, an engagement piece fitting hole 195, an O ring accommodation groove 197, an O ring 199, and a set screw hole. 20
1 and.

The circumferential groove 193 is formed at a position a predetermined distance from the end 127b. The engaging piece insertion hole 191 is
It is formed between the end 127b and the circumferential groove 193. The engagement piece fitting hole 195 is formed in the peripheral groove 193 from the outer peripheral portion 127c. The engaging piece fitting hole 195 has an end 127b.
It is formed with a half shift to the side. The set screw hole 201 is formed to face the engagement piece insertion hole 191. Set screw hole 2
In No. 01, the opening 201a is opened in the outer peripheral portion 127c.
By screwing the screw 201b from the opening 201a,
The screw 201b closes the engagement piece insertion hole 191.

The O-ring 199 is a cylindrical first groove of the circumferential groove 193.
It is located on the member 151 side. As shown in FIG. 2, the male joint 25 includes a main body 211, a coupling pipe 213, and a protruding member 21.
5, a mounting portion 217 of the flexible pipe 15A made of copper pipe, and a third water supply passage 219. The main body 211 is a cylindrical metal member. The third water supply channel 219 is formed along the axis of the main body 211.

The coupling pipe 213 is connected to the one end 21 of the main body 211.
It is formed from 1a to the central portion 211c. Coupling pipe 2
13 is a cylindrical shape, and has an insertion hole 213 for the protrusion member 215.
a. The protruding member 215 has a cylindrical shape, and is inserted and fixed in the insertion hole 213a. Protrusion member 2
Two 15 are provided in axial symmetry of the main body 211.

As shown in FIG. 3, the female joint 27 includes a body 311, a circumferential groove 313, an engaging piece fitting hole 315, an O-ring 316, an engaging piece inserting hole 317, and a set screw hole. 318
And a third water supply passage 319 and a mounting portion 320 for the copper pipe flexible pipe 15A. The main body 311 is a cylindrical metal member.

The female joint 27 is one-touch connected to the male joint connecting portion 137 of the slide type self-sealing joint 17. The sprinkler head 3 is, as shown in FIG.
The sprinkler head portion 433, a coupling pipe 437, and a protrusion member 439 are provided. Sprinkler head 3
First, the coupling pipe 437 is inserted into the second water supply passage 161 from the end 127b shown in FIG. Next, the projection member 439 is inserted into the circumferential groove 193 through the engagement piece insertion hole 191, and the sprinkler head 3 is rotated. Then, screw 20
When 1b is tightened, the opening of the engagement piece insertion hole 191 is closed by the screw 201b. This prevents the sprinkler head 3 from being removed from the tubular second member 127. With these, the connection between the slide type self-sealing joint 17 and the sprinkler head 3 is completed,
Water is sealed by the coupling pipe 437 and the O-ring 199.

Further, by this insertion, the one end portion 411a of the coupling pipe 437 moves the operation portion 181 by a predetermined amount in the arrow YA direction. As a result, the fluid cutoff valve 171 is opened. Therefore, a fluid passage is formed between the second water supply passage 161 and the sprinkler head 3 and is retained. After this insertion, the projecting member 439 has the circumferential groove 193.
Rotate the sprinkler head 3 while it is inside,
When the projection member 439 reaches the engagement piece fitting hole 195, when the projection member 439 is pulled forward, the projection member 439 is inserted in the engagement piece fitting hole 195.

As a result, the sprinkler head 3 is positioned in the rotational direction. Since the sprinkler head 3 is constantly pushed by the coil spring 179, the state in which the protruding member 439 is inserted into the engaging piece fitting hole 195 is retained. That is, in the normal use state, the projection member 439 does not naturally slip out of the engagement piece fitting hole 195, and the sprinkler head 3 does not rotate.

With the sprinkler head 3 and the slide type self-sealing joint 17 described above, the joint length can be freely changed, and the joint and the joint can be separated with one touch. Moreover, the fluid passage can be formed only by performing this one-touch joint. Further, the water at the end of the slide type self-sealing joint 17 can be stopped only by performing the separation.

As a result, in the case of attaching the sprinkler head 3 to the ceiling, the slide type self-sealing joint 17 is attached before the finishing work, and after the finishing work is finished, the sprinkler head 3 is attached. .. It is possible to adjust the amount of exposure from under the ceiling, and since the water is stopped at the terminals, there is no need for a Yatoi pipe for finishing the ceiling. Further, it is not necessary to drain water at the time of mounting the sprinkler head 3 and the like, and it is not necessary to open and close the original valve in the existing case. Even if there is an erroneous operation or misrecognition, the terminal has a built-in waterproof structure, so it is possible to prevent secondary disasters such as stains on the ceiling or walls.

By applying the one-touch joint and the separating work, it is possible to apply the sealing material, eliminate the need for tools, and simplify the work. In addition, it is possible to easily adjust the error size with respect to an error in the ceiling finish size or the buried pipe size. FIG. 12 is a perspective view of the branch joint 23 of the universal header 13, and FIG. 13 is a perspective view of the universal header 13.

Branch joint 23 constituting the universal header 13
Is a branch joint 23A, 23B, 23D, 2 shown in FIG.
3E, a branch joint 23C shown in FIG. 13, and a closing body 501 shown in FIG. Branch joint 23A, 23
B and 23D have the same shape. The branch joint 23A includes a coupling pipe 503, a main body 505, and a branch cylinder 506. The main body 505 is cylindrical and has a male joint connecting portion 508 which is substantially the same as the male joint connecting portion 157 shown in FIG. 9. The coupling pipe 503 has substantially the same structure as the coupling pipe 213 shown in FIG. The coupling pipe 503 is connected to the male joint connecting portion 508 of the other branch joint 23. Branch cylinder 50
6 is a male joint connecting portion 508 of the main body 505, and a coupling pipe 5
03 and the male joint connecting portion 508.
It has almost the same configuration as.

The branch joint 23E has a main body 505, a branch cylinder 506, a male joint connecting portion 508, and a blind lid 509. The blind lid 509 is a terminal portion of the main body 505. The closing body 501 has a connecting pipe 503 and a blind lid 511.
The closing body 501 is the male joint connecting portion 50 of the branch joint 23A.
8 to connect the end of the main body 505.

The branch joint 23C, as shown in FIG.
It is interposed between the branch joint 23B and the branch joint 23D, and includes a male joint connecting portion 508 and a coupling pipe 503.
A connecting pipe 504, a connecting pipe 507, and a protruding member 502.
It has and. The connecting pipe 507 is connected to the female joint connecting portion 19 a of the branched cheese 19. The female joint connecting portion 19 a has substantially the same configuration as the female joint 27.

In the existing sprinkler piping system 1 described above, the sprinkler feed water supplied from the sprinkler sub-main pipe 11 is branched at the universal header 13 and supplied to the sprinkler head 3 via the copper pipe flexible pipe 15. To do. Next, as shown in FIG. 1, the addition of the new sprinkler head 5 will be described.

First, the existing sprinkler head 3 is removed, and the attachment 601 with a branch pipe is attached to the slide type self-sealing joint 17. As shown in FIG. 14, the attachment 601 with a branch pipe has a branch main body 603.
A main body 605, a branch cylinder 607, and a coupling pipe 609.

The body 605 includes a male joint connecting portion 611,
And a fluid cutoff valve 613. The branch cylinder 607 includes a male joint connecting portion 621 and a fluid cutoff valve 623. These male joint connecting portions 611 and 621 and the fluid cutoff valves 613 and 623 are the same as the male joint connecting portion 1 shown in FIG.
57 and a configuration similar to that of the fluid cutoff valve 171.
The coupling pipe 609 has substantially the same configuration as the coupling pipe 503.

The branch main body 603 has a cylindrical shape, and the main body 6
05, the branch pipe 607, and the coupling pipe 609 are assembled.
In the attachment 601 with a branch pipe, the coupling pipe 609 is connected to the slide type self-sealing joint 17, and the male joint connecting portion 611 is connected to the sprinkler head 3.

Next, a sheath pipe 655 is piped from the vicinity of the attachment 601 with the branch pipe to a new ceiling 650 newly provided below the existing ceiling 640. Saya pipe 655
Is a flexible pipe or a CD pipe made of, for example, a synthetic resin, and accommodates a flexible pipe 665 made of a copper pipe. The sheath pipe 655 is fixed to the ceiling base. When it is difficult to directly pipe the sheath pipe 655 because the ceiling is narrow or bent, the steel is first passed through the ceiling, and the steel pipe 655 is piped by the steel.

After the facility of the sheath pipe 655, a copper pipe flexible pipe 665 is inserted into the sheath pipe 655. Flexible pipe made of copper pipe 66
5 has substantially the same structure as the flexible pipe 15 made of copper pipe, in which a female joint 27 is attached to one end and a male joint 25 is attached to the other end. The male joint 25 is attached to the attachment 601 with a branch pipe, and the female joint 27
Is connected to a sliding self-sealing joint 727.

The slide type self-sealing joint 727 has the same structure as the slide type self-sealing joint 17 and is attached to the new ceiling 650. The slide-type self-sealing joint 727 is attached to the ceiling groundwork before the ceiling finish near the inspection port 730. A new sprinkler head 5 is attached to the slide type self-sealing joint 727 after finishing the ceiling.

In FIG. 1, the sheath pipe 655 is arranged up to the vicinity of the slide type self-sealing joint 727.
As shown in FIG. 5, even if the sheath pipe 655A is installed up to the surface of the new ceiling 650, the pipe end is treated with the bell mouth 770, the copper pipe flexible pipe 665 is inserted, and the slide type self-sealing joint 727 is attached. Good.

The plumbing method described above is applicable to the flexible header 1
The number of branches of 3 can be freely increased or decreased. All of the piping from the flexible header 13 to the sprinkler head 3 and the connections can be made into a one-touch plug-in type.
The desired joint portion can be used as a self-seal, and the joint can be freely connected and disconnected without fear of water leakage. A new sprinkler head can be easily added by using the piping to the existing sprinkler head.

As a result, the man-hours of the piping can be reduced, and the working time can be shortened. It should be noted that the present invention is not limited to the above embodiments, and various embodiments can be carried out without changing the gist of the present invention. For example, the joint portion may be appropriately changed as to whether it is a one-touch type or a self-sealing one-touch type.

[0054]

According to the piping method for fluid pipes of the first aspect of the present invention, it is possible to connect and disconnect the equipment with one touch without performing water stopping treatment or draining. As a result, the number of man-hours for piping can be reduced, and the occurrence of a water leakage accident can be prevented, which is an extremely excellent effect.

In the piping method for fluid pipes of the second invention, since the branch self-sealing joint is attached to the end of the branch pipe, the branch pipe is connected without performing water stopping treatment or draining. Or it can be removed. As a result, since it is not necessary to remodel the existing branch pipe, the number of construction steps can be reduced and the number of parts can be reduced.

In the method for constructing a fluid pipe according to the third aspect of the present invention, a pipe for sending from a terminal to another device is provided without substantially modifying the existing pipe, and without performing water stopping treatment or draining of the terminal. be able to. A piping method for a fluid pipe according to a fourth aspect of the invention is a one-touch type joint in which the supply pipe and the branch pipe joint of the first invention, the second invention, or the third invention are connected and the branch pipe joint and the branch pipe are connected. Therefore, it is possible to perform the piping for the fluid without performing thread cutting or liquid stop sealing. As a result, it is not necessary to have a high construction skill, and the number of steps can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a sprinkler piping system 1.

FIG. 2 is a perspective view of a male joint 25. FIG.

FIG. 3 is a perspective view of a female joint 27.

FIG. 4 is an exploded perspective view of a slide type self-sealing joint 17.

FIG. 5 is a sectional view of a slide type self-sealing joint 17.

FIG. 6 is a sectional view of a taper head 175.

FIG. 7 is a sectional view of a flange 177.

FIG. 8 is a left side view of a flange 177.

9 is a perspective view of a male joint connecting portion 157. FIG.

FIG. 10 is a left side view of the male joint connecting portion 157.

FIG. 11 is a perspective view of the sprinkler head 3.

FIG. 12 is an exploded configuration diagram of a universal header 13.

FIG. 13 is a perspective view of a universal header 13.

FIG. 14 is a perspective view of an attachment 601 with a branch pipe.

FIG. 15 is an explanatory view of a mounted state of the sprinkler head 5.

[Explanation of symbols]

 1 ... Sprinkler piping system 3, 5 ... Sprinkler head 13 ... Universal header 15A, 15B, 15D, 15E ... Copper pipe flexible pipe 17,727 ... Sliding self-sealing joint 655 ... Saya pipe

Claims (4)

[Claims] 1. A pipe construction method of a fluid pipe for branching a fluid supply pipe to supply a fluid to a fluid instrument, wherein a branch pipe joint for branching is connected to the supply pipe, and the branch pipe joint is connected to the branch pipe joint. A fluid pipe characterized in that a branch pipe joint is attached to one end and a self-sealing joint is attached to the other end, which has a self-sealing mechanism at the other end Plumbing method for piping. 2. A pipe construction method for a fluid pipe, wherein the self-sealing joint according to claim 1 is a self-sealing joint with a branch having a self-sealing joint structure for branching. 3. A branch pipe for feed pipe is connected to the self-sealing joint according to claim 1, which is connected to a self-sealing joint with branch, or the self-sealing joint with branch, according to claim 2. Piping method for fluid piping. 4. The connection between the supply pipe and the branch pipe joint and the connection between the branch pipe joint and the branch pipe are performed by a one-touch type joint, claim 2, or claim 3. Piping method for fluid piping.