JP4504670B2 - Bypass pipe connection adapter and its use - Google Patents

Description

  The present invention provides a male screw portion formed on a branch port portion of a saddle joint formed with a female screw portion on one end side in the cylinder axial direction of a cylindrical main body provided with a connection port portion of a bypass pipe. The internal threaded portion is screwed so that the cylindrical main body can be fixed to the gas pipe, and a hole saw capable of drilling a through hole in the gas pipe peripheral wall facing the branch port is held inside the cylindrical main body. The present invention relates to an adapter for bypass pipe connection that is possible and a method of using the same.

For example, in the piping work for cutting the existing gas pipe for supplying city gas, the bypass pipe connecting adapter has bypass pipes on both sides sandwiching the planned cutting location so that the gas supply to the user can be maintained. The saddle joint is fixed to the gas pipe, and is connected to the male threaded part formed at the branch port on one end of the cylindrical body in the cylinder axial direction. The formed female screw is screwed together, the cylindrical body is fixed to the gas pipe, a hole saw held inside the cylindrical body, and a through hole is drilled in the peripheral wall of the gas pipe facing the branch port. The bypass pipe connected to the connection port provided in the main body is configured to communicate with the gas pipe.
The conventional adapter for connecting a bypass pipe has a female threaded portion at one end in the cylinder axis direction of the cylindrical main body, and a bypass port connecting port at the other end in the cylindrical axis direction. An operation shaft member that can be rotated from the outside and operated to move in the cylinder axis direction is provided so as to be airtightly inserted into the connection port, and a hole saw held inside the cylindrical body is rotated by the operation shaft member, After the through hole is drilled in the gas pipe peripheral wall facing the branch port portion, the operation shaft member is removed from the cylindrical main body together with the hole saw, and the bypass tube is connected to the connection port portion.
When the bypass pipe is connected in a live pipe state in which the gas flow in the gas pipe is maintained, the operating shaft member is connected to the hole saw after the cylindrical main body and the gas pipe communicate with each other through the through hole drilled by the hole saw. At the same time, when removing the tube body and connecting the bypass pipe to the connection port, the hole saw is opened in the cylinder axis direction in the tube body so that the gas in the gas pipe can be prevented from leaking outside. Is provided with a ball valve that can be inserted through the valve (for example, see Patent Document 1).

JP-A-8-270898

For this reason, it is difficult to remove the operation shaft member from the cylindrical main body together with the hole saw and to connect the bypass pipe to the connection port, and it is difficult to improve the work efficiency, and the bypass pipe is in a live pipe state. Is connected to the cylindrical main body in order to prevent leakage of the gas in the gas pipe to the outside, there is a disadvantage that the structure is complicated.
The present invention has been made in view of the above circumstances, and it is easy to improve work efficiency, and when a bypass pipe is connected in a live pipe state, leakage of gas in the gas pipe to the outside with a simple structure. It aims to be able to prevent.

The first characteristic configuration of the present invention is that a female screw part is formed on one end side in the cylinder axial direction of a cylindrical body provided with a connection port part of a bypass pipe, and is formed at a branch port part of a saddle joint fixed to a gas pipe. The cylindrical threaded body is fixed to the gas pipe by screwing the female threaded part into a certain male threaded part, and a hole saw capable of drilling a through hole in the gas pipe peripheral wall facing the branch port is formed in the cylindrical shape. An adapter for connecting a bypass pipe that can be held inside the main body, wherein the hole saw can be operated to rotate from the outside of the cylindrical main body, and an operation shaft member that can be moved in the direction of the cylindrical axis. The connection port portion is inserted in an airtight manner into the other end side in the tube axis direction of the tube body, and the connection port portion is connected in communication from the radial direction to the intermediate position in the tube axis direction of the cylindrical body. A female thread portion for mounting is formed and the female hole for mounting the hole saw A male screw portion screwed into di portions formed on the outer peripheral portion of the hole saw, and its inside forming a thread groove-like spiral groove of a hole saw, the are formed on the outer peripheral portion of the hole saw male threaded portion Is screwed into the female thread portion for attaching the hole saw of the branch port portion, and the hole saw is inserted into the branch port portion in a state in which the section of the gas pipe peripheral wall is held in the spiral groove. The cylindrical main body is divided into a main body portion in which the connection port portion is connected in communication and a connection portion in which the female screw portion is formed, and the main body portion and the connection portion. Are connected in a relatively rotatable manner.

[Action and effect]
A hole saw held inside the cylindrical body can be rotated from the outside of the cylindrical body, and an operation shaft member that can be moved in the cylindrical axis direction is airtightly inserted into the other end side in the cylindrical axis direction of the cylindrical body, The connecting port portion of the bypass pipe is connected to the intermediate position of the cylindrical body in the cylindrical axis direction from the radial direction, and the connecting port portion and the mounting portion of the operating shaft member are provided separately. The bypass pipe can be connected to the connection port without removing the gas from the gas pipe when the bypass pipe is connected in the live pipe state. It is easy to improve efficiency, and when connecting a bypass pipe in a live pipe state, it is possible to prevent leakage of gas in the gas pipe to the outside with a simple structure without providing a ball valve in the cylindrical main body.
In addition, the male screw portion formed on the outer peripheral portion of the hole saw is screwed into the female screw portion for attaching the hole saw of the branch port portion, and the hole saw is inserted into the branch port portion so that the branch port portion can be closed. So, for example, when you want to release the existing gas in the bypass pipe and replace it with the introduced gas by introducing the gas in the gas pipe through the through hole into the pipe of the bypass pipe with both ends connected to the connection port, A hole saw can be used as a valve body for opening and closing the branch port.
And the cylindrical main body is divided into a main body part in which the connection port part is connected in communication and a connection part in which a female screw part is formed, and the main body part and the connection part are connected so as to be relatively rotatable. Therefore, while keeping the orientation of the body part around the cylinder axis substantially constant, by rotating the connection part relative to the body part, the female thread part of the connection part can be securely connected to the male thread part of the branch port part. It is easy to fix the cylindrical body to the saddle joint so that the connection port portion faces the predetermined connection direction of the bypass pipe, and the bypass pipe connected to the connection port portion has a gas pressure in the pipe. So that the body and the connection portion rotate relative to each other so that the male screw portion of the branch port and the female portion of the cylindrical body are rotated. There is little risk of loosening with the threaded portion.

The second characteristic configuration of the present invention is that the pre-SL operating shaft tube axis direction movement preventing possible blocking member parts from the cylindrical body outwardly is provided blocking releasably.

[Action and effect]
Because the cylinder axial movement of the steering Sakujiku member blocking possible blocking member from the cylindrical body outwardly is provided blocking releasably, the hole saw in operation of the operating shaft member withdrawn from the branch opening, the branch opening In order to prevent the hole saw from unexpectedly moving to the branch port side and closing the branch port when it is desired to maintain the open state, the cylinder shaft of the operation shaft member can be operated from the outside of the cylindrical main body. Directional movement can be prevented.

A third characteristic configuration of the present invention is that the connection port portion is detachably connected to the cylindrical main body.

[Action and effect]
When the connection port portion is damaged, the connection port portion can be easily replaced, and even with bypass pipes having different diameters, the connection port portions corresponding to the diameters can be mounted and connected to the cylindrical main body. .

4th characteristic structure of this invention is a usage method of the adapter for bypass pipe connections of any one of Claims 1-3 , Comprising: The external thread part currently formed in the outer peripheral part of the said hole saw is said branch port The operation shaft member that is screwed into the female thread portion for attaching the hole saw of the portion and is provided so as to be able to close the branch port portion, and is hermetically inserted into the other end side in the tube axis direction of the tube body, and the tube shape A hole saw held on the inside of the main body is engaged and connected so as to be disengageable and disengageable in the cylindrical axis direction by an operation from the outside of the cylindrical main body, and the operation shaft member and the The point is that a cap is screwed into the male screw portion of the branch port portion that has been disengaged from the hole saw and released from the female screw portion of the cylindrical main body.

[Action and effect]
Since the male screw part formed on the outer peripheral part of the hole saw is screwed into the female screw part for attaching the hole saw of the branch port part and the branch port part is provided so as to be closed, the cylindrical main body is removed when the bypass pipe is removed. The hole saw held inside is rotated by an operation shaft member that is airtightly inserted into the other end of the cylindrical body in the tube axis direction, and the male thread portion of the hole saw is screwed into the female screw portion of the branch port portion, The branch port can be closed.
Since the operating shaft member and the hole saw are detachably engaged and connected in the cylindrical axis direction by an operation from the outside of the cylindrical main body, the operating shaft member and the hole saw are closed with the hole mouth closed. To release the engagement with the female threaded portion of the cylindrical body so that the gas in the gas pipe does not leak to the outside. The cap can be screwed into the male screw portion of the branch port after the cylindrical main body is removed, and the through hole can be reliably closed with the hole saw and the cap.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 5 shows a resin saddle joint B in which the saddle portion 1 is heat-sealed and fixed to the outer peripheral surface of a resin gas pipe C for supplying city gas. A cap attaching male screw portion 3 is formed on the outer peripheral side, and a plug attaching female screw portion (hole saw attaching female screw portion) 4 is formed on the inner peripheral side of the branch port portion 2.

  1 to 4 show a metal bypass pipe connection adapter (hereinafter simply referred to as an adapter) A according to the present invention that can be detachably fixed to the saddle joint B. The connection port portion 5 of the resin bypass pipe D is shown in FIG. A fixing female threaded portion 7 is formed on one end side of the cylindrical main body 6 provided in the cylinder axis X direction, and the fixing female threaded portion 7 is screwed into the cap mounting male threaded portion 3 of the saddle joint B to form a cylindrical shape. A main body 6 is provided so as to be fixed to the gas pipe C, and a hole saw 9 capable of drilling a through hole 8 in a gas pipe peripheral wall facing the branch port portion 2 of the saddle joint B is provided inside the cylindrical main body 6 so as to be held. .

  The cylindrical main body 6 is divided into a main body portion 10 in which the connection port portion 5 is connected in communication and a connection portion 11 in which a fixing female screw portion 7 is formed. Are connected so as to be relatively rotatable around the tube axis X, and the connecting lever 11 is rotated with respect to the main body 10 by the operation lever 12 fixed to the connecting portion 11, and the fixing female screw portion 7 is attached. The saddle joint B can be screwed into the cap mounting male thread 3.

  The main body portion 10 is integrally provided with an upper cylindrical portion 15 having a top plate 14 at one end portion in the tube axis X direction of the intermediate tube portion 13 whose appearance is a cubic shape, and the cylinder tube X direction and the like of the intermediate tube portion 13. A lower cylindrical portion 16 that integrally holds the connection portion 11 so as to be relatively rotatable is integrally provided at the end portion, and a circular inner space 17 that can move the hole saw 9 up and down is formed between the main body portion 10 and the connection portion 11. The air purge hole 18 formed in the X direction and formed in the intermediate cylinder portion 13 so as to communicate with the circular inner space 17 is closed with a plug 19.

  The operation shaft member 20 that holds the hole saw 9 so as to be rotatable from the outside of the cylindrical main body and movable in the direction of the cylindrical axis X is an upper cylindrical shape that is the other end side of the cylindrical main body 6 in the cylindrical axis X direction. A male screw member 21 that is inserted into the top plate 14 of the portion 15 in an airtight manner and can be pressed against the operation shaft member 20 from the radial direction is screwed to the upper cylindrical portion 15, so that the operation shaft member 20 extends in the cylinder axis X direction. A blocking member capable of blocking the movement is provided so that the blocking can be released from the outside of the cylindrical main body.

  Further, a seat plate 22 for fixing the connection port portion is screwed to the peripheral wall portion in which the through hole 23 of the intermediate cylinder portion 13 is formed, and the female screw portion 24 formed on the seat plate 22 is used for screwing operation. A substantially cylindrical connection port 5 having a hexagonal portion 25 and an external fitting portion 26 of a bypass pipe is screwed in, and the connection port 5 can be attached to and detached from the radial direction at the intermediate position in the cylinder axis X direction of the cylindrical main body 6. Is connected in communication.

  The operation shaft member 20 is configured to be able to rotate by fitting a rotating portion of an electric tool 28 such as a drill to an outer hexagonal shaft portion 27 formed at an end projecting outward from the cylindrical main body. As shown in FIG. 4, an inner hexagonal shaft portion 30 to be fitted into the hexagonal hole 29 formed in the hole saw 9 is formed at the tip portion that enters the inside of the cylindrical main body, and the operation shaft member 20 and the hole saw 9 are formed. Is provided with a plurality of ball detent mechanisms 31 that can be engaged and disengaged in the cylinder axis X direction in a state of being prevented from coming off by operation from the outside of the cylindrical main body.

  The hole saw 9 is formed in a substantially cylindrical shape in which a hexagonal hole 29 into which the inner hexagonal shaft portion 30 of the operation shaft member 20 is fitted is formed in the upper end portion, and the inner hexagonal shaft portion 30 is formed in the hexagonal hole 29. By rotating the inserted operating shaft member 20, the male screw portion 32 formed on the outer periphery thereof is screwed into the female screw portion 4 for plug attachment, and the inside of the branch port portion 2 is directed in the direction of the cylinder axis X. Reciprocating movement is provided.

  Then, a spiral groove 33 having a thread groove shape is formed inside the hole saw 9, and the slice 34 is cut into the section 34 of the gas pipe peripheral wall generated when the through hole 8 is drilled. The hole saw 9 provided so as to be able to be held in a fitted state and holding the section 34 inside is inserted into the branch port portion 2 by screwing the male screw portion 32 with the female screw portion 4 for plug attachment, and the branch The mouth portion 2 is provided so as to be closed.

  Next, in the piping work for cutting the middle of the existing resin gas pipe C for supplying city gas, the adapter A is used so that both sides sandwiching the planned cutting position can be maintained so that the gas supply to the user can be maintained. A method for temporarily communicating with the bypass pipe D will be described.

  The saddle joint B is fixed on both sides of the planned cut portion of the existing gas pipe C in the live pipe state in which the supply gas circulates, and the connection port 5 is connected to the bypass pipe D as shown in FIG. In the state facing the connecting direction, the fixing female screw portion 7 of the cylindrical main body 6 is screwed into the cap mounting male screw portion 3 of each saddle joint B, and the hole saw 9 is attached to the operation shaft member 20 by a ball detent mechanism. The adapter A engaged and connected by 31 is fixed.

  Next, as shown in FIG. 6 (b), the bypass pipe D is connected over both the connection ports 5 and fastened and fixed with a band or the like, and the rotating part is fitted with the operation shaft member 20 with a drill 28. The hole saw 9 is rotated to pierce the through-hole 8 in the peripheral wall of the gas pipe. As shown in FIG. 6C, one branch saw 2 ( 2a), the other hole saw 9 (9b) holding the section 34 inside is pulled up from the other branch port 2 (2b) by the operating shaft member 20 and fixed by the male screw member 21. The gas pipe C and one end side of the bypass pipe D are communicated with each other, and the air purge hole 18 of the adapter A (A1) that closes the branch port 2 (2a) with the hole saw 9 (9a) is opened. After replacing the air in D with the supply gas, 7 (d), the air purge hole 18 is closed with a plug 19, and the hole saw 9 (9 a) closing the branch port 2 (2 a) is pulled up by the operating shaft member 20 and fixed with the male screw member 21. The both sides sandwiching the planned cutting location are temporarily connected by the bypass pipe D.

  Next, as shown in FIG. 7 (e), the construction is completed such as cutting the planned cutting portion, closing the cut end portion, and connecting the new gas pipe 36 to the existing gas pipe D via the branch joint 35. After that, the male screw member 21 is loosened, and each hole saw 9 (9a, 9b) holding the section 34 inside is screwed into the female screw portion 4 for plug attachment of each branch port portion 2 (2a, 2b). These branch openings 2 (2a, 2b) are closed, and as shown in FIG. 8 (f), the bypass pipe D is removed from each adapter A, and each operation shaft member 20 is forcibly pushed up to operate the operation shaft. The engagement connection of the member 20 and the hole saw 9 by the ball detent mechanism 31 is released, and each operation shaft member 20 is fixed by the male screw member 21.

  Next, the screwing of the fixing female screw portion 7 of the cylindrical main body 6 and the male screw portion 3 for attaching the cap of the saddle joint B is released, and the hole saw 9 holding the section 34 inside is connected to each branch port portion 2. Each adapter A is removed while being screwed into the female screw portion 4 for attaching the plug, and a cap 37 is screwed into the male screw portion 3 for attaching the cap of the branch port 2 as shown in FIG. Thus, the supply gas is restored so as not to leak from the through hole 8.

[Second Embodiment]
FIG. 9 shows another embodiment of the metal bypass pipe connecting adapter A according to the present invention, in which a circular window hole 38 is formed in the peripheral wall portion facing the through hole 23 of the intermediate cylinder portion 13 in the main body portion 10. The window hole 38 is closed with a transparent acrylic resin plate 39, and a metal presser frame body 40 is fixed to the peripheral wall portion by pressing the peripheral portion of the acrylic resin plate 39 against the peripheral wall portion with a sealing material interposed therebetween. The lifting / lowering state of the hole saw 9 can be confirmed from the outside.
Other configurations are the same as those of the first embodiment.

[Other Embodiments]
The adapter for bypass pipe connection according to the present invention may be used for connecting a bypass pipe to a metal gas pipe such as a steel pipe or a cast iron pipe.

Perspective view of bypass pipe adapter Partial cross-sectional side view of adapter for bypass pipe connection Side view showing how the bypass pipe adapter is installed Longitudinal section of the main part Saddle joint perspective view Illustration of how to use the bypass pipe adapter Illustration of how to use the bypass pipe adapter Illustration of how to use the bypass pipe adapter Partial sectional side view showing a second embodiment of the bypass pipe connecting adapter

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Branch port part 3 Male thread part 4 Female thread part for hole saw attachment 5 Connection port part 6 Cylindrical main body 7 Female thread part 8 Through-hole 9 Hole saw 10 Main body part 11 Connection part 20 Operation shaft member 21 Blocking member 32 Male thread part
33 spiral grooves
34 section 37 Cap B Saddle joint C Gas pipe D Bypass pipe X Tube shaft

Claims (4)

A female threaded portion is formed on one end side in the cylinder axial direction of the cylindrical main body provided with a connecting port portion of the bypass pipe, and the female threaded portion is formed on the male threaded portion formed at the branch port portion of the saddle joint fixed to the gas pipe. Are provided so that the cylindrical main body can be fixed to the gas pipe,
A bypass pipe connecting adapter that is provided so that a hole saw that can pierce through holes in a gas pipe peripheral wall facing the branch port portion can be held inside the cylindrical body,
An operation shaft member capable of rotating the hole saw from the outside of the cylindrical main body and moving in the cylindrical axis direction is inserted airtightly into the other end of the cylindrical main body in the cylindrical axis direction,
The connection port portion is connected in communication from the radial direction to the intermediate position in the cylindrical axis direction of the cylindrical main body,
Forming an internal thread portion for attaching a hole saw on the inner peripheral side of the branch port portion of the saddle joint, and forming an external thread portion to be screwed into the internal thread portion for attaching the hole saw on the outer peripheral portion of the hole saw ; and A spiral groove is formed inside the hole saw,
The male screw portion formed on the outer peripheral portion of the hole saw is screwed into the female screw portion for attaching the hole saw of the branch port portion, and the section of the gas pipe peripheral wall is fitted and held in the spiral groove. A hole saw is inserted into the branch port portion, and the branch port portion is provided so as to be closed,
The cylindrical main body is divided into a main body part in which the connection port part is connected in communication and a connection part in which the female screw part is formed, and the main body part and the connection part are connected to each other so as to be relatively rotatable. bypass pipe connecting adapter you have. Before SL operating shaft member of the cylindrical axial movement claim 1 bypass pipe connecting adapter according to the blocking possible blocking member is provided from the tubular body outward freely prevented released. The bypass pipe connection adapter according to claim 1 or 2, wherein the connection port portion is detachably connected to the cylindrical main body. It is a usage method of the adapter for bypass pipe connection of any one of Claims 1-3 ,
A male screw portion formed on the outer peripheral portion of the hole saw is screwed into a female screw portion for attaching a hole saw of the branch port portion, and the branch port portion is provided so as to be closed, and the cylinder axis direction of the cylindrical main body The operation shaft member inserted airtightly on the other end side and the hole saw held inside the cylindrical main body are engaged and connected so as to be detachable in the cylindrical axis direction by an operation from the outer side of the cylindrical main body,
With the branch port portion closed with the hole saw, the engagement connection between the operation shaft member and the hole saw is released, and the screw connection with the female screw portion of the cylindrical body is released. How to use an adapter for bypass pipe connection in which a cap is screwed into the male thread.

Images