JP2649282B2 - Non-stop water installation method such as fluid control valve and hermetic connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Industrial application field] The present invention relates to an existing fluid pipe, for example, a water pipe, in a state of uninterrupted water supply (in a flowing state without stopping the flow of flowing water in the existing pipe by a previously installed water control valve). In particular, the present invention relates to a method of installing a fluid control valve in which a fluid control valve is installed in a sealed housing. The present invention relates to a method for installing a valve and a construction device therefor.

[Conventional technology]

Japanese Patent Publication No. Sho 59-42193 discloses a technique of this type.

That is, according to the known technique, a pair of split wheels are slidable on a pipe circumferential surface corresponding to both sides of the installation location of the fluid control valve, and then the fluid control valve is installed including these split wheels. After enclosing the location in a sealed housing and cutting the installation location of the fluid control valve in the housing with a cutting machine, attach the fluid control valve to the cut portion in a state that restricts movement in the pipe axis direction. After that, split connecting rings located on both sides thereof are received by the fluid control valve from the outside and pushed in from both sides so that the fluid control valve is straddled between the connection flange portion and the pipe end of the cutout portion. After connecting these two pipes, the fluid control valve is attached in the middle of the pipe by removing the outer casing.

However, according to the externally known technique, the cut end face of the cut fluid pipe is exposed, and is constantly in contact with the fluid in the fluid pipe, and depending on the corrosive fluid, corrosion starts from the cut end face and the deterioration is early. There is a problem with progress.

[Problems to be solved by the invention]

The present invention has been made in view of the above-mentioned circumstances, and an object (technical problem) of the present invention is to provide a novel construction method in which rust does not occur on a cut portion in a non-water-proof installation method of this type of fluid control valve. I do.

B. Configuration of the Invention [Means for Solving the Problems] In order to achieve the above object, the method for installing uninterrupted water in a fluid control valve of the present invention employs a configuration (technical means) comprising the following steps. That is, in a sealed case, in the method of cutting off the fluid pipe into a straight tube with a cutting machine, and then inserting the fluid control valve into the cut portion, the fluid control valve is installed continuously without water.
A step of slidably mounting a fixed connection ring on one side and a movable connection ring on the other side in advance on the pipe peripheral surface corresponding to both sides of the installation location of the fluid control valve, after cutting the fluid pipe with a cutting machine, A first joint ring holding a sealing material to be in contact with the cut end face on the fixed connection ring side is attached to the cutout portion, and a seal is contacted to the cut end face on the movable connection ring side on the other side. Inserting a fluid control valve equipped with an extendable second joint ring holding a material, pressing the movable connection ring together with the fluid control valve in the pipe axis direction to form the fixed connection ring and the first connection ring. A step of engaging the joint ring in a watertight manner, and then a step of retracting the movable connecting ring via the second joint ring.

In addition, the close connection device implements a method of installing the fluid control valve in the middle of the water without interruption, and a fixed connection that is mounted while maintaining water tightness on the pipe peripheral surface on one side of the insertion installation location of the fluid control valve. A ring, a movable connection ring slidably and watertightly mounted on the pipe peripheral surface on the other side of the insertion location of the fluid control valve, and the fixed portion on one side of the inserted fluid control valve. A first joint ring attached to the connection ring, and a second joint ring attached to the movable connection ring on the other side of the fluid control valve to be inserted and installed, and expandable and contractable in the pipe axis direction. And 2 joint rings.

[Action]

In the movement of the first joint ring, the packing is pressed against the cut surface of the fluid pipe on the fluid ring side on the fixed connection ring side, and the second
The packing is pressed against the cut surface of the fluid ring on the movable connection ring side by the movement of the joint ring.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for installing uninterrupted water of a fluid control valve and a hermetically-sealed connection device of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show an intermediate step of the method of the present invention (a state immediately after the insertion of the fluid valve). The whole of the hermetic connection device of the embodiment is shown. .

In the figure, P is a fluid pipe such as a water distribution main pipe, Q is a cut end thereof, S is a working closed case, and V is a fluid control valve to be inserted.

(Working Sealed Case) First, the working sealed case S will be described.

The working closed case S is formed in two parts in a plane including the tube axis of the upper case 100 and the lower case 101, and their flanges 102 and 103 are brought into contact with each other to be integrally assembled with the fastening bolts 104. At both ends in the tube axis direction,
An insertion hole 106 through which the fluid pipe P is inserted is opened, a metal plate 107 is fixed to the inner surface of the main sealed case S facing the insertion hole 106, and a packing is provided in a gap between the insertion hole 106 and the fluid pipe P. 108 is installed. A pressing wheel 109 presses the packing 108. The pressing wheel 109 is advanced by a tightening bolt 110 screwed into the main sealed case S.

Further, the push ring 109 is provided with a detachment prevention device 111 that prevents the detachment of the bolt by biting into the fluid pipe P.

Although the closed case S has a substantially horizontal cylindrical shape, the upper portion forms a rectangular opening 113, and a flange 114 on the upper end surface is used to connect other devices described later. A guide rail 115 is provided vertically on the inner surface of the closed case S so as to face the opening 113. 116 is a work window that can be opened and closed.

A drain pipe 118 is provided at the bottom of the lower part of the closed case S, and support legs 119 for supporting the whole case S are provided at the bottom.
Is provided.

(Sealed Connection Device) The sealed connection device of the present embodiment is mounted on the fluid pipe P side and the inserted fluid control valve V side in the working sealed case S. Connection part.

In other words, this sealed connection device includes fixed and movable connection rings 1, 2 arranged on the left and right sides of the fluid pipe P with the fluid valve V interposed therebetween.
A first joint ring 3 arranged on the fluid control valve V side in correspondence with the fixed connection ring 1, and an outer ring 4 and an inner ring 5 arranged in correspondence with the movable connection ring 2. The second coupling ring 6 is included as a main configuration.

In addition, the sealing connection device includes an auxiliary ring 7, a sliding guide 8 and a pusher 9 as auxiliary components, and is used for mounting operation of the sealing connection device.

Hereinafter, the detailed structure of each part of the sealed connection device will be described.

In the following description, the front part and the rear part are fluid valves V
Is defined as a front portion, and a side away from the fluid valve is defined as a rear portion.

FIG. 3 shows the sealed connection device taken out.

In the figure, a fixed connecting ring 1 is made of a split body, and a pipe P
And has a packing 10 in a watertight manner, and has an annular horizontal flange 11 protruding in the horizontal direction at the front part and a flange part 12 protruding outward in the pipe radial direction. In the rear portion, a flange portion 13 protruding outward, a rubber ring accommodating concave portion 14 is formed inward, and a rubber ring 15 is accommodated in the rubber ring accommodating concave portion 14 and the flange portion 13 and a bolt are formed. It is pressed by the pressing wheel 16 which engages through the pressing.

The first joint ring 3 forms an integral tubular body and is installed corresponding to the fixed connection ring 1. That is, a flange portion 18 which abuts against the flange portion 12 is fitted on the rear portion of the first joint ring 3 so as to fit the front shape of the fixed connection ring 1, and a right angle so as to receive the horizontal flange 11. A right-angled concave portion 19 is formed.

The flange portions 12, 18 are fastened to each other by fastening bolts inserted into bolt insertion holes formed at corresponding positions. Thus, the vertical wall surface 19a of the right-angled concave portion 19 is extended until its inner diameter end at least reaches the inner diameter of the fluid pipe P. That is, the right-angled concave portion 19 may protrude from the inner surface of the fluid pipe P, but is disadvantageous in that the fluid resistance is increased. Then, the sealing material 20 is fixedly mounted on the vertical wall surface 19a.
The sealing material 20 forms an annular plate having a predetermined thickness. Also, right angle recess
An annular groove is formed in the circumferential wall 19b of the
1 is fitted. The packing 21 comes into contact with the horizontal flange 11 of the fixed connection ring 1 and performs a watertight action.

A flange 23 is stretched outward at a front portion of the first joint ring 3, and is fixed to a valve box of the fluid valve V with mounting bolts 24 installed at a plurality of locations in a circumferential direction of the flange 23. .

The movable connection ring 2 is formed of a split body, and substantially conforms to the configuration of the fixed connection ring 1 except that consideration is given to having a movable function. That is, the packing 26 and the flange
27, a rubber ring accommodating recess 28, a rubber ring 29, and a pressing ring 30 are formed, respectively, according to the configuration of the rear part of the fixed connecting ring 1. At the front part, a flange part 32 protruding outward is provided, and a right-angle concave part 33 is formed inside.

The second joint ring 6 has an expansion / contraction function by a combination of the outer ring 4 and the inner ring 5 which are an integral tubular body, and is installed corresponding to the movable connection ring 2. More specifically, a flange 36 extends outward from the front of the outer ring 4 and is fixed to the fluid valve V with a mounting bolt 37.

A flange portion 39 is also stretched outward at the rear of the outer ring 4,
A horizontal screw hole 40 is formed in the flange portion 39 at predetermined intervals in the circumferential direction in parallel with the pipe axis.
Between them, a vertical screw hole 41 is opened toward the center of the tube axis.

An extrusion screw 43 is screwed into the horizontal screw hole 40, and a tightening screw 44 is screwed into the vertical screw hole 41.

The inner ring 5 is disposed so as to overlap within the inner diameter of the main body of the outer ring 4, and a packing groove is formed in the outer peripheral surface of the front end thereof,
The packing 46 mounted in the packing groove comes into contact with the inner peripheral surface of the outer ring 5 to perform a water-tight action.

The rear part of the inner ring 5 has a shape corresponding to the front part of the movable connection ring 2. That is, a flange portion 49 protruding outward from the rear end surface with a peripheral surface 48 having a predetermined length therebetween is formed,
The flange portion 49 contacts the flange portion 32 of the movable connection ring 2. The flange portions 32 and 49 are fastened to each other by a fastening bolt inserted into a bolt insertion hole opened at a corresponding position. The flange portion 49 also serves as an abutment for the extrusion screw 43 screwed into the flange portion 39 of the outer ring 4. A peripheral surface 48 from the rear end surface to the flange portion 49 is fitted in the right-angled concave portion 33 of the movable connection ring 2, a packing 50 is mounted in a packing groove formed on the peripheral surface 48, and watertightness with the movable connection ring 2 is provided. Works. A circumferential concave portion 51 is formed inward at the rear end face, and a sealing material 52 is fixedly mounted in the concave portion 51. The recess 51 has at least an outer diameter equal to or greater than the outer diameter of the fluid pipe P and an inner diameter equal to or less than the inner diameter of the fluid pipe P. Seal material
Reference numeral 52 denotes an annular plate having a predetermined thickness, similarly to the sealing material 20.

In the sealed connection device of the present embodiment having the above-described configuration, a flange portion is provided because of the connection with the slide guide 8 described later.
12, 18, 32, and 49 have the same diameter.

Returning to FIG. 1 and FIG. 2 again, the interposition ring 7, the slide guide 8, the pusher 9, and other members will be described.

(Intermediate ring) The intermediate ring 7 is at least divided into two parts, and is abutted and interposed between the backing plate 107 of the sealed case S and the flange portion 13 of the fixed connection ring 1 of the fully-sealed connection device, and is fixed. The front end of the connecting ring 1, that is, the front end of the horizontal flange 11 faces the cutting portion.

(Sliding Guide 8) The sliding guide 8 has a function of supporting the sealed connection device including the fluid valve V below and guiding the sealed connection device when it moves in the pipe axis direction.

More specifically, a guide box 60 is disposed at the center of the bottom of the sealed case S, while the base 62 is provided with a base 63 that is vertically movably fitted along the inner wall of the guide box 60. And a flat plate 64 on the base 63. The guide box 60 and the base 63 are linked by a screw rod 66, and a key groove is vertically provided on a side surface of the base 63, and a key 67 fixed to the sealed case S side is fitted into the key groove. Thereby, the base 63 moves up and down without rotating together with the rotation of the screw rod 66. Guide pipes 69 are arranged side by side on a flat plate 64 of the base 62. The flanges 12 and 32 of the connecting rings 1 and 2 constituting the sealed connecting device on the guide pipe 69 and the joint ring
The outer end surfaces of the lower portions of the flange portions 18 and 49 of the third and sixth portions abut.

(Push-out Tool 9) The push-out tool 9 is provided at least on the axial side surface of the closed case S on the side where the movable connection ring 2 is provided, and has a function of pushing the movable connection ring 2 forward by an operation from outside the closed case S. .

More specifically, a circular hole 75 is formed on the side surface of the sealed case S, and a guide cylinder 77 is fixed to the outside of the case S so as to face the circular hole 75, and a moving shaft 79 of the case S It extends to the inside and is arranged. The guide cylinder 77 and the moving shaft 79 are linked by a screw rod 81, and the moving shaft 79 is
This prevents the coaxial rotation with the screw rod 81, and the rotation of the screw rod 81 causes the moving shaft 79 to move forward and backward. An engaging element 84 is attached to the distal end of the moving shaft 79, and the front end surface 84a of the engaging element 84 is brought into contact with the flange 27 of the moving connecting ring 2.

The pusher 9 may be provided on both end surfaces of the sealed case S. In this case, the movable connection ring 2 of the sealed connection device may be provided on either side, and the degree of freedom of mounting is increased. I do.

(Fluid Valve V) The fluid valve V of this embodiment is a so-called butterfly valve, and the valve element 130 housed in the valve box opens and closes by rotating the valve rod 132. The figure shows the open state.

The joint rings 3, 6 of the present sealing connection device are directly fixed to the valve box of the fluid valve.

The valve stem 132 is connected via a flange 133 at its upper end via a connector 136 attached to the lower end of an elevating shaft 135 of an insertion device described later.

That is, the connecting body 136 includes a cross beam member 137 fixed to the elevating shaft 135 and a slider 140 having a rectangular cross section inserted into the groove 138 of the cross beam member 137 and engaged via the pin 139. Both ends of the cross beam member 137 are slidably engaged with the guide rail 115 of the closed case S described above. The pin 139 has a pin hole 142 provided in the cross beam member 137 and a pin hole provided in the slider 140.
The pin holes 142, 143 are formed in a long groove shape, and the pin holes 142 allow the fluid valve V to move in the axial direction.

(Embodiment Method) A method for setting up the fluid control valve without interruption using the above-described sealed connection device of this embodiment will be described with reference to FIGS. FIG. 1 and FIG. 2 show the construction in progress, and FIG. 3 shows the finished state.

(1) First, as shown in FIG. 4, a work space F is secured by excavating the ground E at a position where the fluid control valve of the fluid pipe P is provided. At this time, it is preferable that the ground at the bottom of the excavation hole is ground-treated so as to have a sufficient ground strength.

After the cutting machine H is attached to the water distribution main pipe P at the position where the fluid control valve is installed, the fixed connection ring 1 and the movable connection ring 2 of the main sealing connection device are attached to the outside thereof. The packings 15, 29 and the pressing rings 16, 30 at the rear of the joint rings 1, 2 have been removed.

In the figure, reference numeral 200 denotes a drive shaft of the cutting machine H, and reference numeral 202 denotes a joint at the upper end thereof.

(2) Attach the lower case 101 around the fluid pipe P via the legs 119 (see FIG. 5). Also,
The interposition ring 7 is installed between the backing 107 of the closed case S and the rear end of the fixed connection ring 1, and the slide guide 8 is also installed by adjusting the level of the guide pipe 69.

Next, cover the upper case 102 of the working closed case S,
The closed working case S is assembled integrally. At this time, the openings 106 at both ends of the sealed case S are
The container 109 is closed in a watertight manner, and the detachment prevention fitting 111 is used. Thereafter, the blind lid I is put on, and a water pressure test is performed in this state (see FIG. 6).

(3) If it is confirmed that the watertight state is maintained, the blind cover I is removed, and the flange 11 is placed on the working case S.
The work water control valve J and the connecting cylinder K are attached in a watertight manner via 4. The lid connection cylinder K has a working window. At this time, the working water control valve J is in the open state (see FIG. 7).

(4) After that, the driving device L of the cutting machine H is mounted on the connecting cylinder K.
(See FIG. 8).

FIG. 9 shows a driving shaft 204 of the driving device L in the closed case S.
And a connection state between the cutting machine H and the drive shaft 200 of the cutting machine H. As can be seen from the figure, the connection between the two is made near the lower part of the working water control valve J via the working window of the connecting cylinder K.

In this state, the cutting machine H is driven to cut the fluid pipe P. The cutting mechanism of the cutting machine H is a known one, and the rotation of the drive shaft 200 is distributed in two directions by a bevel gear mechanism, and further, a cutting tool is attached to the outer peripheral surface of the fluid pipe P via a gear mechanism and a chain mechanism. The fluid pipe P is rotated around the fluid pipe P so that the fluid pipe P is cut into a straight pipe.

With this cutting, the fluid in the fluid pipe P fills the working closed case S, the working water control valve J, and the connection tube K, but works without interruption without overflowing to the outside. The chips are discharged together with flowing water from the drain pipe 118 at the lower bottom of the closed case S.

(5) When the cutting operation of the fluid pipe P is completed, the cutting machine H is pulled up while holding the cut piece.

Then, when the cutting machine H has passed the working water control valve J, the working water control valve J is closed, and then the cutting machine H and its driving device L are removed (see FIG. 10).

(6) Next, the fluid valve insertion device M equipped with the fluid valve V is mounted on the connecting tube K in a watertight manner (FIG. 11). At this time, the joint rings 3 and 6 are attached to the fluid valve V, and the joint ring 6 is fixed in a contracted state. The elevating shaft 135 is in a contracted state. The fluid valve V is housed in the connection tube K in a watertight manner.

Thereafter, the working water control valve J is opened, the insertion device M is driven to extend the elevating shaft 135, and the fluid valve V is pushed into the working sealed case S.

At this time, since the fluid valve V is lowered along the guide rail 115 in the working sealed case S, the fluid valve V can be easily inserted into the cut portion.

When the flanges 18, 49 of the joint rings 3, 6 mounted on the fluid valve V are seated on the pipe 69 of the sliding guide 8, the lowering stops.

 1 and 2 show this state.

(7) The pusher 9 is operated to push the movable connecting ring 2 toward the fluid valve V.

 FIG. 12 shows the initial state.

That is, the end surface 84 a of the engaging element 84 of the pushing tool 9 abuts on the flange 27 of the movable connection ring 2. Then, in this state, the screw rod 81 of the pushing tool 9 is rotated to move the moving shaft 79 forward. At this time, the tightening screw 44 of the second joint ring 6 is in a locked state.

 FIG. 13 shows a state in which the pushing forward has been completed.

As shown in the drawing, the first joint ring 3 is fitted on the fixed connection ring 1, and the seal member 20 attached to the joint ring 3 is
Is pressed against. In addition, the movable connection ring 2 protrudes forward and closes the gap at the cut portion. As a result, the flowing water in the fluid pipe P is completely stopped.

(8) Drain pipe 118
As shown in FIG. 14, the tightening screw 44 is loosened in the closed case S, and the pushing screw 43 is turned to rotate the inner ring 5 of the second joint ring 6 so that the sealing material 52 cuts the inner ring 5 as shown in FIG. Push it back until it touches the surface Q.

Thereafter, the working closed case S, the working water control valve J, the connecting tube K, and the like are removed, and the connecting ring is used in the closed connecting device.
Packing 5, 29 and pressing wheels 16, 30 are attached to the rear of 1, 2 to maintain water tightness.

In this step, if the running water in the working closed case S is drained, the working closed case S may be immediately removed.

(9) As shown in FIG. 15, the opening / closing operation device N is mounted on the fluid valve V, and a base 0 is installed below the fluid valve V as necessary.

Thereafter, predetermined valve room processing is performed, and the ground E is backfilled.

As described above, according to the method of the present embodiment, when the fluid valve V is inserted into the cut portion, the sliding guide 8 provided on the bottom of the working sealed case S and the flanges 12, 1 of the sealed connection device are provided.
The sliding action with 8, 32, 49 guides the movement in the axial direction, and the insertion and installation work is performed smoothly and easily.

Further, the cut surface Q of the cut portion is hermetically sealed by the sealing materials 20 and 52, and rusting from the cut surface Q is prevented.

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following embodiments are included in the technical scope of the present invention.

In the hermetic connection device, it is essential that the joint rings 3, 6 hold the sealing materials 20, 50, and that the joint ring 6 is extendable and contractible. Other configurations are limited to those of the embodiment. However, it can be appropriately changed.

That is, the connecting rings 1 and 2 may be 30% or more,
Further, the watertightness of the rear portion may be achieved by welding with a fluid pipe. The fixing of the joint rings 3 and 6 to the fluid valve V at the front can be performed by appropriate means such as welding. Further, the seal member 52 may be directly attached without being provided in the concave portion 51 at the end of the inner ring 5. The sealing between the connecting rings 1 and 2 and the connecting rings 3 and 6 is performed by packing the flanges 12 and 18 and the flanges 32 and 4 outside the packings 21 and 50.
9 or a gasket interposed between them.

FIG. 16 shows another fitting mode of the fixed connection ring 1 and the joint ring 3.

As shown in the figure, the horizontal flange is omitted in the fixed connection ring 1, and a concave portion 90 is formed instead, and the horizontal flange 91 that projects rearward from the flange portion 18 is provided in the joint ring 3. When the flange portion 18 of the joint ring 3 comes into contact with the flange portion 12 of the fixed connection ring 1, the horizontal flange 91 enters the concave portion 90 to maintain watertightness by the packing 92, and is further attached to the right-angle concave portion 19 of the joint ring 3. The sealing material 20 comes into contact with the cut surface Q of the fluid pipe P to seal the cut surface Q.

The method / apparatus of the present invention is not applied only to the installation of the fluid control valve, but can be applied to other uses, for example, the installation of a flow meter. In short, it suffices to attach the joint rings 3 and 6 to the object. .

C. According to the present invention, a cut surface of a fluid pipe cut into a straight tube is hermetically sealed by a seal member gripped by the present hermetic connection device, and rust generation from the cut surface is reliably prevented. Can be.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of a method for installing uninterrupted water such as a fluid control valve of the present invention and a hermetically-sealed connecting device thereof. FIG. ),
FIG. 2 is a partial cross-sectional side view, FIG. 3 (a) is an enlarged view of a main part of the device of the present invention, FIG. 2 (b) is an enlarged view of a portion A in FIG.
(C) is an enlarged view of a portion B of (a), FIG. 4 is an initial process diagram, FIG. 5 is a process diagram following FIG. 4, FIG. 6 is a process diagram following FIG. 5, FIG. Is a process drawing following FIG. 6, FIG. 8 is a diagram showing a cutting process, FIG. 9 is an internal portion in a cut state, FIG. 10 is a drawing diagram of a cutting machine and a pulling-up process of a cut piece, and FIG. Insertion process diagram, FIG. 12 is an initial process diagram of the connection operation of the fluid valve, FIG.
Figure is an intermediate process diagram of the connection operation of the fluid valve, FIG. 14 is a process diagram of the completion of the connection operation of the fluid valve, FIG. 15 is a completion diagram of the installation of the fluid valve,
FIG. 16 is a view showing another state of contact between the connecting ring and the joint ring. P ... fluid pipe, Q ... cut surface, S ... working sealed case, V ... fluid valve, 1 ... fixed connection ring, 2 ... movable connection ring, 3 ... first joint ring, 6 ... … Second joint ring, 20,52 ……
Seal member

Claims (3)

(57) [Claims] 1. A method for installing a fluid control valve in a sealed case, wherein the fluid pipe is cut into a straight tube by a cutting machine, and then the fluid control valve is inserted into the cut portion. A step of slidably mounting a fixed connecting ring on one side and a movable connecting ring on the other side on the pipe peripheral surface corresponding to both sides of the location.After cutting the fluid pipe with a cutting machine, Telescopic mounting and holding a first joint ring holding a seal material to be in contact with the cut end face on the fixed connection ring side, and holding a seal material in contact with the cut end face on the movable connection ring side on the other side Inserting a fluid control valve equipped with a possible second joint ring, pressing the movable connection ring together with the fluid control valve in the pipe axis direction to make the fixed connection ring and the first joint ring watertight. Engaging step, after which the movable connecting ring is retracted via the second joint ring The method of installing a fluid control valve without interruption. 2. The method of claim 1, wherein a flow meter is installed instead of the fluid control valve. 3. A fixed connection ring which is mounted on one side of a pipe peripheral surface of a fluid control valve insertion location while maintaining watertightness, and a pipe peripheral surface on the other side of the fluid control valve insertion location is provided. A movable connection ring mounted slidably and watertightly; a first coupling ring mounted on one side of a fluid control valve inserted and installed corresponding to the fixed connection ring; And a second joint ring which is mounted on the other side of the fluid control valve corresponding to the movable connection ring and is expandable and contractable in the pipe axis direction.