JPH0758117B2 - Branch joint for pipe - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipe branch joint used for branching a supply pipe to an existing pipe for transporting a fluid such as city gas.

[Prior Art] Generally, as shown in FIG. 13, a buried gas supply pipe for city gas is constructed by branching a branch pipe B branched from a main pipe A to a supply pipe C facing a consumer. Has been done.

By the way, in the case where the pipe is a steel pipe, generally, as shown in a. FIG. 13, a perforation (not shown) is formed at a branch connection portion of the steel pipe 90, and the saddle 91 is laid across the perforation, 91
Is hermetically fixed to the steel pipe 90 by, for example, two U bolts 92, 92, and a connecting member 93 such as a service Qi is attached to the saddle 91. b. As shown in FIG. 14, the upper clamp 94 was laid over the hole (not shown) formed at the branch connection portion of the steel pipe 90, and applied to the upper clamp 94 and the lower part of the steel pipe 90. Tighten both ends of the lower clamp 95 with bolts 96, 96, and fix the upper clamp 94 to the steel pipe 90.
Airtightly fixed to the connection member 93
Clamp method to connect the clamp to the upper clamp 94. c. As shown in FIG. 15, a screwing method in which a screw hole (not shown) is formed at a branch connection point of the steel pipe 90, and a connecting member 93 such as a service Q is directly and airtightly screwed into the screw hole. . d, 16th
As shown in the figure, an annular saddle 97 in which a female screw 97A is formed in a hole (not shown) formed in the branch connection portion of the steel pipe 90.
Are attached by welding 98 in correspondence with each other, and a branch connection is made by a welding method in which a branch pipe is connected to the saddle 97.

On the other hand, when the pipe is a cast iron pipe, branch connection is made by the saddle method described in a, the clamp method described in b, or the screwing method described in c.

[Problems to be Solved by the Invention] However, in the above-described conventional saddle system and clamp system, the saddle 91 and the clamps 94, 95 on both upper and lower sides are made of steel pipe 90.
Alternatively, the U-bolts 92, 92 and the lower clamp 95 protrude to the outside of the lower side portion of the steel pipe 90 or the cast iron pipe while protruding relatively to the outside of the both sides of the cast iron pipe. Therefore, there is a drawback that the ground excavation area around the branch connection point becomes large, which deteriorates excavation workability and increases excavation cost.

Further, in the screwing method, since the airtightness needs to be maintained at the screw portion, the diameter of the branch pipe that can be branched is limited by the wall thickness of the main pipe.

Furthermore, the welding method requires advanced welding skills and
Since it takes a long time for welding work, the workability is poor, and there are restrictions on the work that cannot be performed on cast iron pipes.

The present invention has been made in view of such circumstances, it can be installed regardless of the steel pipe and cast iron pipe, and is easily and surely installed on the existing pipe as compared with a saddle system or a clamp system, In addition to achieving cost reduction by further downsizing and simplification of the structure, excavation work is improved by eliminating the protrusion to the outside of both sides of the existing pipe and the outside of the lower side of the existing pipe, reducing excavation costs. An object of the present invention is to provide a branch joint for pipes that can be used.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a hollow saddle-shaped main body portion for abutting an outer periphery of an existing pipe corresponding to an elongated hole formed in the existing pipe according to the present invention, and a hollow of the main body portion Connecting member mounting portion formed in communication with the first portion, and a pair of first fastening member insertions facing each other and formed in communication with the hollow portion of the main body portion having a direction intersecting the axis of the existing pipe. Through hole, a first fastening member having a collar portion of a size that cannot be inserted into one of the through holes, and a rod-shaped portion that can be inserted into the through hole; And a blade-shaped second fastening member that is set to a lateral dimension smaller than the minor axis dimension and is screwed to the outer peripheral feed screw portion of the rod-shaped portion, and is inserted from the long hole into the existing pipe and the long hole is formed. The second fastening member, which is turned so as to traverse, is screwed by the rotation of the first fastening member. It is in, which is constituted so as to fasten hermetically nipped the existing pipe and the main body portion between the flange portion and the second fastening member.

[Operation] According to the present invention, the tip end portions of the blade-shaped second fastening member and the first fastening member are inserted into the existing pipe through the long holes formed in the existing pipe while being shielded from the outside (atmosphere). , The hollow saddle type main body is attached to the outer circumference of the existing pipe, and the first fastening member is rotated by 90 ° around the axis to make the second saddle pipe inside the pipe.
After rotating the fastening member by 90 ° to change the direction so that it crosses the long hole, pull the first fastening member slightly outward in the radial direction of the existing pipe to bring the second fastening member into contact with the inner surface of the existing pipe. A load is applied, and in this state, the first fastening member is rotated in the screw fastening direction, and the first fastening member is screwed, whereby the flange portions of the second fastening member and the first fastening member are relatively brought close to each other, and (2) The fastening member is pressed against the inner surface of the existing pipe, and the flange portion of the first fastening member is pressed against the outer peripheral portion of one of the through holes so that the collar portion and the second fastening member form the hollow saddle-shaped main body portion and the existing portion. After pinching the pipe and tightening it airtightly, connect the connecting member (valve Qi or branch pipe, etc.) to the screw hole for connecting the connecting member that communicates with the inside of the existing pipe through the other through hole and the hollow part. .

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an example of a pipe branch joint according to the present invention, and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.
FIG. 3 is a vertical sectional view taken along the line III-III, in which the pipe branch joint is composed of a hollow saddle type main body 1, a first fastening member 2 and a second fastening member 3.

The hollow saddle-shaped main body 1 has an annular standing peripheral wall portion 11, a hollow portion 14 surrounded by a top wall portion 12 and a bottom wall portion 13, and a bottom wall portion 13
Is a saddle-shaped lower surface 13A of which is formed in an arc shape with a curvature that matches the outer peripheral curvature of the existing pipe P, and a screw hole having an axis C2 orthogonal to the axis C1 of the existing pipe P on one side of the upper wall 12 A connecting member mounting portion 15 is formed so as to penetrate, and a through hole 16 for inserting one first fastening member having an axis C3 parallel to the axis C2 is formed adjacent to the connecting member mounting portion 15, and the bottom wall portion 13 is formed. The other through hole 17 which is concentric with the through hole 16 and has an oval shape is formed in the hole. The O-ring 4 is fitted in the downward annular groove 18 formed on the outer peripheral edge of the lower surface 13A of the bottom wall portion 13, and the O-ring 4 is fitted in the upward annular groove 19 formed on the outer peripheral portion of one of the through holes 16. 5 is fitted. Further, as shown in FIG. 4, restriction protrusions 17A, 17A are provided so as to protrude downward on a part of the outer peripheral portion of the other through hole 17. The first fastening member 2 is a bolt having a collar portion (head portion) 21 having a size that cannot be inserted into the through hole 16 and a rod-shaped portion (shaft portion) 22 having a diameter smaller than that of the through hole 16. The second fastening member 3 is screwed into the feed screw portion 23.

As shown in FIG. 5, the second fastening member 3 has a vertical length smaller than the long-axis dimension L1 of the substantially eyebrow-shaped long hole H formed in the existing pipe P and larger than the short-axis dimension W1 of the long hole H. The blade shape is set to have a lateral dimension W2 smaller than the dimension L2 and the minor axis dimension W1. That is, when the long axis of the second fastening member 3 is matched with the long axis of the long hole H to correspond thereto, the long hole H
It is formed with a size that can be inserted into. Then, as shown by an imaginary line, when it is rotated 90 ° and then pulled up, as shown in FIG. 6, a curvature that can be brought into contact with the inner peripheral surface of the existing pipe P so as to be in contact therewith. And the upper surfaces 3A, 3A of both ends are formed, and a protrusion 31 having an outer peripheral curvature that is close to and faces the inner peripheral surface of the curvature of the elongated hole H is provided at the central portion so as to project upward. .

Next, a mounting procedure of the above configuration will be described.

Existing piping P buried in the ground as shown in FIG.
The area around the branch point is excavated to the extent that the shutter device 7 is attached by the chain 6.

A well-known eyebrow punching machine (not shown) is attached to the shutter device 7, and the shutter is opened to open the existing pipe P.
The above-mentioned elongated hole H (see FIG. 5) is bored in the hole.

After closing the shutter device 7, the punching machine is removed, and a no-blow case (not shown) made of a resin bag body such as transparent acrylic or transparent vinyl is attached to the shutter device 7, and the shutter device 7 is connected to the outside ( (Atmosphere).

The shutter 7 is opened after the branch joint according to the present invention, for example, a connecting member (not shown) such as a service che and tools are loaded into the no-blow case.

The second fastening member 3 and the first fastening member 3 are oriented with the long axis of the second fastening member 3 aligned with the long axis of the long hole H of the existing pipe P.
From the long hole H to the lower end of the rod-shaped portion 22 of the fastening member 2, the existing pipe P
The bottom wall of the hollow saddle body 1
The other protruding hole 17 formed in 12
A and 17A are fitted into the elongated holes H and positioned, and the hollow saddle type main body 1 is spliced on the outer circumference of the existing pipe P (see FIG. 2).

By rotating the first fastening member 2 about its axis by 90 °, the second fastening member 3 is turned around to cross the slot H (see the phantom line in FIG. 5 and FIG. 3). This operation is
The screwing resistance value of the first fastening member 2 and the second fastening member 3 is set to be slightly larger than the screwing resistance value of a normal bolt / nut, and both 2 and 3 are coupled so as to be rotatable simultaneously. This can be properly performed by marking the upper surface of the collar portion 21 of the first fastening member 2 so as to indicate the directionality of the second fastening member 3.

The first fastening member 2 is pulled upward, and the second fastening member 3
The upper surfaces 3A, 3A of both ends of the
In addition, the protrusion 31 is fitted into the elongated hole H from the lower side to apply a load to the second fastening member 3 (see FIG. 6).

While maintaining the above state, the first fastening member 2 is rotated in the screw tightening direction by the tool described above.

As a result, the first fastening member 2 is screwed downward to relatively approach the second fastening member 3 and the flange portion 21 of the first fastening member 2,
The lower surface of the collar portion 21 compresses the O-ring 5 fitted in the annular groove 19 at the outer peripheral portion of the through hole 16 downward, and the O-ring 4 fitted in the annular groove 18 of the main body portion 1 is inserted. The outer peripheral surface of the existing pipe P is compressed upward.

By continuing the rotation of the first fastening member 2 in the screw tightening direction, the second fastening member 3 is screwed upward. Therefore, the state shown in FIG. 8, that is, the upper surfaces 3A, 3A of both ends of the second fastening member 3 are in close contact with the inner surface of the existing pipe P, and the lower surface of the collar portion 21 of the first fastening member 2 is the O-ring 5. It is possible to obtain a state in which the hollow saddle type main body portion 1 is straddled over the existing pipe P in an airtight state in which the O-ring 4 is pressed against the outer peripheral surface of the existing pipe P while being pressed against the existing pipe P.

The connection member mounting portion 15 of the hollow saddle body 1 is screwed with the connection member such as the above-mentioned service tee to be mounted,
Shut off with a survey stopper and screw in valve valve (both not shown).

The no-blow case 2 described above and the shutter device 7 described above are sequentially removed, and a branch pipe or a supply pipe is connected to the valve che described above.

According to the present invention, the restriction protrusion formed on a part of the outer peripheral portion of the other through hole 17 formed on the bottom wall portion of the hollow saddle-shaped main body portion 1.
By fitting 17A and 17A into the long hole H, the main body 1 is automatically positioned at an appropriate position with respect to the existing pipe P. Moreover, due to the synergistic restriction action of the restriction projections 17A, 17A fitting into the elongated hole H and the projection 31 of the second fastening member 3 fitting into the elongated hole H, the existing pipe P is On the other hand, it is possible to reliably prevent the main body 1 from moving in the axial direction and around the axis, and the O-ring 5 is pressed against the lower surface of the flange portion 21 of the first fastening member 1, that is, the lower surface of the head of the bolt. Through hole
16 is hermetically sealed, and the O-ring 4 surrounds the outer peripheral portion of the elongated hole H and is pressed against the outer peripheral surface of the existing pipe P to hermetically seal the elongated hole H. The branch joint can be tightly fastened to the pipe P.

Further, since the structure is simplified and the lateral dimension as well as the lateral dimension is made small to prevent the existing piping P from protruding to the outer side of both sides and the outer side of the lower side, handling is improved. At the same time, the excavation work area is improved by limiting the excavation area around the branch point of the existing pipe P to be small,
The excavation cost can be reduced.

In the above embodiment, the connection member mounting portion 15 is formed by the screw hole having the axis C2 orthogonal to the axis C1 of the existing pipe P. However, as shown in FIG. A connecting member mounting portion 15 having a cylindrical shape having an axis C2 parallel to the axis C1 of is formed, and the retaining member 60, the retainer 61 and the gasket 62 are arranged on the outer periphery of the end portion thereof, and the pressing ring 63 and the joint body are arranged.
The branch pipe 65 may be connected by screwing 64 together.

Further, as shown in FIG. 10, a tubular connecting member mounting portion having an axis parallel to the axis C1 of the existing pipe P and having an enlarged diameter end portion.
15 is formed, and the stopper member 70 and the gasket 7 are provided on the inner circumference of the expanded portion.
1, the retainer 72, the spring 73, and the retaining member 74 may be arranged, and the push ring 75 may be screwed into the enlarged diameter portion of the connecting member attachment portion 15 to connect the branch pipe 76.

Further, as shown in FIG. 11, if the plug hole 80 is formed in the vicinity of the one through hole 16 for inserting the first fastening member, the gas bag 81 blocks the flow of gas in the existing pipe P. After attaching the main body part 1, the gas vent tube pulled out from the plug 80 (air vent tube)
The gas in the gas bag 81 is discharged from 82 to shrink it, and then the tube 82 is pulled to use the plug hole 80 for cleaning up. Needless to say, the plug hole 80 is closed by a plug (not shown) after the gas bag 81 is taken out.

Further, in the above-mentioned embodiment, the elongated hole H is formed in a substantially eyebrow shape, but it may be formed in an elliptical shape or an elliptical shape.
Further, the long axis L1 of the long hole H may be formed so as to be oriented in the circumferential direction of the existing pipe P.

[Effects of the Invention] Since the present invention is configured as described above, the following effects are achieved.

That is, the hollow saddle type main body portion is inserted by inserting the tip ends of the blade-shaped second fastening member and the first fastening member into the existing pipe through the long holes formed in the existing pipe in a state of being shielded from the outside (atmosphere). Is attached to the outer circumference of the existing pipe, and the first fastening member is rotated 90 ° about the axis to move the second fastening member in the pipe.
After rotating by 90 ° to change the direction so that it crosses the long hole, pull the first fastening member slightly outward in the radial direction of the existing pipe and bring the second fastening member into contact with the inner surface of the existing pipe to apply a load. In this state, the first fastening member is rotated in the screw fastening direction and the first fastening member is screwed to bring the second fastening member and the flange portion of the first fastening member relatively close to each other, and the second fastening member is already installed. While making pressure contact with the inner surface of the pipe, the flange portion of the first fastening member is brought into pressure contact with the outer peripheral portion of one through hole, and the hollow saddle type main body portion and the existing pipe are sandwiched between the flange portion and the second fastening member. Since it can be fastened in an airtight manner, it can be easily and reliably attached to steel pipes and cast iron pipes without requiring any high skill, and there is no restriction in use.

Moreover, the simplification of the structure and the reduction in size and weight can improve the handling and reduce the cost.Because it does not protrude to the outside of both sides or the outside of the lower side of the existing pipe, the excavation area of the ground can be reduced during fastening. Since it can be limited, there is an economic advantage that the excavation workability can be improved and the cost can be reduced.

[Brief description of drawings]

1 is an overall plan view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view taken along line II-II in FIG. 1, and FIG.
A vertical cross-sectional view taken along the line I-III, FIG. 4 is a bottom view, and FIG. 5 is an explanatory plan view showing the relationship between the long hole of the existing pipe and the second fastening member,
FIG. 6 is a sectional view of a position corresponding to FIG. 3 showing a state in which a fastening member is brought into contact with the inside of an existing pipe, and FIG. 7 is a schematic sectional view showing a state in which the ground is excavated and a shutter device is attached. 8
FIG. 9 is a sectional view showing a fastening state at a position corresponding to FIG. 3, FIGS. 9 to 11 are explanatory views showing another embodiment of the present invention, FIG. 12 is a schematic explanatory view of a piping system, and FIGS. FIG. 16 is an explanatory diagram of a conventional example. 1 ... Hollow saddle type main body 2 ... First fastening member 3 ... Second fastening member 14 ... Hollow portion 15 ... Connection member mounting portion 16 ... One through hole 17 ... The other through hole 21 ... … Collar part 22 …… Rod part 23 …… Outer peripheral feed screw part C1 …… Existing pipe axis C3 …… Through hole axis H …… Long hole L1 …… Long hole long axis dimension L2 …… Second fastening member Vertical dimension P …… Existing piping W1 …… Short axis dimension of long hole w2 …… Horizontal dimension of second fastening member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Nishigata One day at 153 Tajime-cho, Kishiwada-shi, Osaka

Claims (1)

[Claims] 1. A hollow saddle-shaped main body portion that is attached to the outer periphery of the existing pipe in correspondence with a long hole formed in the existing pipe, and a connecting member attachment portion formed in communication with the hollow portion of the main body portion. A pair of through holes for inserting the first fastening members, which are formed to communicate with the hollow portion of the main body portion and have a direction intersecting the axis of the existing pipe, and which are not insertable into one of the through holes. A first fastening member having a brim portion and a rod-shaped portion that can be inserted; the rod-shaped member having a vertical dimension smaller than the major axis dimension of the elongated hole, greater than the minor axis dimension, and a lateral dimension less than the minor axis dimension; A second fastening member screwed into the outer peripheral feed screw portion of the blade portion, the second fastening member being inserted into the existing pipe from the long hole and being redirected to cross the long hole. It is screwed by the rotation of the fastening member, and the main body portion and the existing pipe by the collar portion and the second fastening member. Pipe branch connection, characterized in that clamping pressure which was configured to fastened airtight.