JPH11141782A - Pipe connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe connecting device which prevents the application of a great force to the base part etc., of a branch opening part due to the relative movements of a fluid pipe and a case and which prevents the leaking of water due to the movements of the fluid pipe and the case. SOLUTION: In a pipe connecting device, a fluid pipe 1 and a case 2 can move relative to each other in the direction of the pipe axis and rotate in the circumferential direction of the pipe even at the application of a bending, tensile or compressive force to the pipe connecting device due to an earthquake or ground subsidence etc., and a locking member 12 mounted on the outer peripheral surface of the fluid pipe 1 abuts to a movement stopping member 10 to stop excessive movement, thus preventing the application of a great force to the base part etc., of a branch opening part 5. Also, since the locking member 12 is firmly secured to the fluid pipe 1, an accident such as the leakage of water due to the excessive relative movement of the pipe connecting device is also prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device used for connecting a branch pipe to a fluid pipe such as a water main pipe.

[0002]

2. Description of the Related Art As a device for connecting a branch pipe to a water main or the like, a split T-shaped pipe A as a pipe connecting device as shown in FIGS. 4 and 5 is known.

This conventional split T-tube A has three cases B
1, B2, and B2, and the respective cases B1, B
2, B2 is provided with a flange C. The cases are
Packing D is sandwiched between opposed flanges C and bolts
It is fastened by a nut E. In the first case B1, a branch port F connected to the branch pipe K is provided outward at right angles to the pipe axis, and the water main pipe I and the branch pipe K are provided inside the branch port F. The communication port F1 for communication is open. A plurality of fixing seats G are provided at both ends in the tube axis direction of each case so as to protrude. A female screw is cut in the fixing seat G, and a fixing bolt H is screwed in from the outside to the inside. The main water line I is provided with a branch water inlet J for passing water through the branch pipe K, and the split T-tube A faces the communication hole F1 of the first case B1 to the branch water inlet J. It is attached to the outer peripheral surface of the water main I in a watertight manner in accordance with the position. Further, the split T-tube A is fixed to the water main pipe I by strongly screwing the fixing bolt H so that the end bites into the outer peripheral surface of the water main pipe I.

[0004]

In the above-mentioned pipe connection device, the water main pipe and the branch pipe are relatively moved in various directions due to an earthquake, land subsidence, or the like, and a bending, tension or compression force acts. When the water main pipe and the branch pipe move relative to each other in the pipe axis direction, a large force concentrates on the base of the branch port of the first case, and there is a possibility that breakage such as cracks may occur. In addition, since the water pipe and the case are only fastened and fixed by the fixing bolt, when the above-described force acts, the pipe connection device may move excessively and cause a water leakage accident.

An object of the present invention is to solve the above-mentioned problem, and it is possible to prevent a large force from acting on a base portion of a branch port, and at the same time, to move a fluid pipe and a case body. It is an object of the present invention to provide a pipe connection device capable of preventing water leakage due to the above.

[0006]

In order to solve the above-mentioned problems, a pipe connection device of the present invention is connected to a fluid pipe having a branch water opening by means of left and right annular packings while maintaining watertightness. A pipe connecting device comprising a case body and a branch port facing sideways, wherein one or more locking members are protruded at predetermined positions on the outer peripheral surface of the fluid pipe, and the locking members are sandwiched. As described above, the present invention is characterized in that the movement preventing members separated to the left and right by a predetermined distance are provided on the case body.

It is preferable that the locking members are attached to both outer sides of the case body in the tube axis direction at a predetermined distance, and the movement preventing members are both outer ends in the tube axis direction of the case body.

It is preferable that the movement preventing member is an annular groove which is wider than the width of the locking member in the tube axis direction and which is externally fitted to the locking member.

Preferably, the locking member is formed in a ring shape divided into a plurality of parts, and is attached to a groove formed at a predetermined depth on the outer peripheral surface of the fluid pipe.

The branch port is connected to the branch pipe, the branch port is formed with a predetermined gap on the outer peripheral surface of the connection pipe and can be fitted in a watertight manner. And a locking means interposed between the connecting pipe and the branch port so that the connecting pipe can slide.

[0011] The branch port portion includes a branch port portion having a spherical inner peripheral surface, a slidable spherical ring in the branch port portion while maintaining watertightness, and a watertight portion in the spherical ring portion. It is preferable that the connecting pipe be fitted while maintaining the property and be slid relatively in the axial direction.

According to the present invention, even if a bending, pulling, or compressing force acts on the pipe connection device due to an earthquake, land subsidence, or the like, relative movement of the fluid pipe and the case body in the pipe axis direction becomes possible. Since the movement preventing member comes into contact with the locking member attached to the outer peripheral surface of the fluid pipe and prevents excessive movement,
In addition to preventing a large force from acting on the base of the branch port, etc., since the locking member is securely fixed to the fluid pipe, an accident such as water leakage due to excessive relative movement of the pipe connection device Is also prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. A case body 2 is provided on the outer peripheral surface of a water main pipe (fluid pipe) 1 made of ductile cast iron or the like buried underground. It is installed while maintaining water tightness. The case body 2 is composed of a first case 2a and a second case 2b which can be divided into two parts in the radial direction. It is attached to. Since the case body 2 is in contact with the water main pipe 1 only by the packing 4, when a force acts on the case body 2 from the outside, relative movement and circumferential rotation along the outer peripheral surface of the pipe are possible. The case body 2
It may be possible to divide into a plurality of parts such as not only two but also three.

The first case 2a is integrally provided with a branch port 5 outwardly at right angles to the pipe axis, and an annular packing groove is formed on the inner peripheral surface of the distal end opening of the branch port 5. 5a and a locking projection (locking means) 5b are formed.

The connecting pipe 6 has an outer diameter smaller than the minimum inner diameter of the branch port 5, and is expanded and contracted into the branch port 5 via an annular packing 7 arranged in the annular packing groove 5a. Mounted freely. At one end of the connecting pipe 6, a flange 8 for connecting the branch pipe 13 is provided, and at the other end, a stopper ring (locking means) 9 which abuts on the locking convex portion 5b and prevents the connecting pipe 6 from coming off. Is provided. The communication pipe 6
It may be fitted to the outer peripheral surface of the branch opening 5 so that it can expand and contract freely.

An abutment surface (movement preventing member) 10 substantially perpendicular to the pipe surface is provided on the outer side of the case body 2 in the pipe axis direction, and the outer peripheral surface of the water main 1 is spaced from the abutment face 10. A groove 11 is formed at a position, and a locking ring (locking member) 12 is attached to the groove.

The locking ring 12 is divided into two parts, and tapped steps 12a and 12b are formed at both ends of the ring, and are assembled into an integral ring shape by bolts 17. The locking ring 12 may be fixed by welding to the outer peripheral surface of the pipe.

Even if a bending, pulling or compressing force acts on the pipe connection device of the present invention, the force applied to the case body 2 is absorbed by the relative movement or circumferential rotation of the water main 1 and the case body 2. Reduced. Further, the water main 1 and the case body 2 relatively move, and the relative movement stops when the contact surface 10 comes into contact with the locking ring 12, but since the locking ring 12 is fixed to the water main 1, The case body 2 does not move more than the predetermined movement amount and leak water. In addition, the aforementioned force is applied to the connecting pipe 6
Are absorbed by bending or expanding and contracting with respect to the case body 2, so that the force applied to the case body 2 is reduced.

Therefore, unlike the related art, there is no fear that a crack is generated at the base of the branch opening 5 or that the case body 2 moves in the axial direction and leaks water.

FIG. 3 shows a second embodiment of the present invention. A case body 2 is attached to the outer peripheral surface of a water main pipe (fluid pipe) 1 made of ductile cast iron or the like buried underground while maintaining watertightness. The case body 2 is a first case 2 that can be divided into two in the radial direction.
a and a second case 2b, and a packing 4 is mounted in a packing groove 3 at both ends thereof so as to be in close contact with the outer peripheral surface of the water main 1. As in the first embodiment, the case body 2 is in contact with the water main 1 only with the packing 4, so that when a force acts on the case body 2 from the outside, the case body 2 relatively moves or rotates in the circumferential direction along the outer peripheral surface of the pipe. Is possible.

The first case 2a is integrally provided with a branch port 5 outwardly at right angles to the pipe axis. An annular packing groove is formed on the inner peripheral surface of the opening at the distal end of the branch port 5. 5a and a spherical surface 5c are formed. An outer peripheral surface is formed in a spherical shape inside the branch opening 5, and an annular packing groove 14a is formed inside.
And a spherical ring 14 formed with locking projections 14b are fitted in a watertight manner via an annular packing 7. Branch 5
A pressing wheel 15 having a spherical surface formed on the inner peripheral surface is fixed to the outside of the ring so as to prevent the spherical ring 14 from coming off.

The connecting pipe 6 is inserted into the spherical ring 14 in a watertight manner via an annular packing 16 arranged in the annular packing groove 14a. One end of the connecting pipe 6 has a flange 8 for connecting the branch pipe 13, and the other end has a locking projection 14 b.
And a stopper ring 9 for preventing the connecting pipe 6 from coming off is attached by a bolt.

A ring groove (annular groove) 18 that opens radially inward is formed on the outer side of the packing groove 3 of the case body 2 in the pipe axis direction, and a locking ring 12 described later is formed in the ring groove 18. It is arranged with a margin.

Two grooves 11 are formed at predetermined positions on the outer peripheral surface of the water main pipe 1 at a distance equal to the distance between the centers of the left and right ring grooves 18 of the case body 2. A member 12 is attached to the groove 11. Since both surfaces of the ring groove 18 in the tube axis direction and the side surfaces of the locking ring 12 come into contact with each other at the time of movement, it is possible to prevent movement to both the left and right only by installing the locking ring 12 at one place.

Even when a bending, pulling or compressing force acts on the pipe connection device of the present invention, the force applied to the case body 2 is absorbed by the relative movement or circumferential rotation of the water main pipe 1 and the case body 2. Reduced. In addition, the addition of a spherical ring at the branch port allows a large bending angle between the branch port and the connecting pipe,
The force applied to the case body 2 is reduced.

Therefore, unlike the related art, there is no fear that a crack is generated at the base of the branch opening or that the case body moves in the axial direction and leaks water.

The present invention is not limited to the above-described embodiment, but two locking rings 11 are attached as in the second embodiment, but may be one. Further, the ring groove 18 may be provided separately from the case body. Further, the locking ring 12 may be divided not only into two parts but also into plural parts. The branch pipe may be attached to the gate valve after attaching the gate valve to the connecting pipe.

[0029]

According to the present invention, the fluid pipe and the case body can be moved relative to each other in the pipe axis direction even if a bending, pulling or compressing force acts on the pipe connection device due to an earthquake, land subsidence, or the like. At the same time, the movement preventing member comes into contact with the locking member attached to the outer peripheral surface of the fluid pipe to prevent excessive movement,
In addition to preventing a large force from acting on the base of the branch port, etc., since the locking member is securely fixed to the fluid pipe, an accident such as water leakage due to excessive relative movement of the pipe connection device Is also prevented.

According to the second aspect of the present invention, it can be used for an existing pipe connection device attached to a fluid pipe. Further, the case body currently used can be used without processing.

According to the third aspect of the present invention, only one locking member is required, which is economical.

According to the fourth aspect of the invention, the fixing of the locking member to the fluid pipe is ensured.

According to the fifth and sixth aspects of the present invention,
Since the branch opening and the branch pipe can relatively bend and expand and contract, the force acting on the base of the branch opening can be suppressed.

[0034]

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a locking ring.

FIG. 3 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 4 is a front view showing a conventional example.

FIG. 5 is a central longitudinal side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water main pipe (fluid pipe) 2 Case body 2a 1st case 2b 2nd case 3 Packing groove 4 Packing 5 Branch port 5a Annular packing groove 5b Locking convex part (locking means) 5c Spherical surface 6 Communication pipe 7 Ring Packing 8 Flange 9 Stopper ring (locking means) 10 Contact surface (movement preventing member) 11 Groove 12 Locking ring (locking member) 12a, 12b Step 13 Branch pipe 14 Spherical ring 14a Annular packing groove 14b Locking convex Part 15 Pressing ring 16 Annular packing 17 Bolt 18 Ring groove (annular groove) A Split T-tube B1, B2 Case C Flange D Packing E Bolt / Nut F Branch port F1 Communication port G Fixing seat H Fixing bolt I Water main pipe J branch water inlet K branch pipe

Claims (6)

[Claims] 1. A pipe connection device comprising: a case body connected to a fluid pipe having a branch water port with watertightness by left and right annular packings; and a branch port portion facing sideways. At least one locking member protrudes at a predetermined position on the outer peripheral surface of the fluid pipe, and a movement preventing member which is separated by a predetermined distance left and right is provided on the case body so as to sandwich the locking member. A pipe connection device characterized by the above-mentioned. 2. The locking member is attached to both outer sides of the case body in the tube axis direction at a predetermined distance, and the movement preventing members are both outer ends of the case body in the tube axis direction. The pipe connection device according to item 1. 3. The pipe connection device according to claim 1, wherein the movement preventing member is an annular groove that is wider than the width of the locking member in the tube axis direction and that is externally fitted to the locking member. 4. The liquid crystal device according to claim 1, wherein the locking member is formed in a ring shape divided into a plurality of parts, and is attached to a groove formed at a predetermined depth on an outer peripheral surface of the fluid pipe. A pipe connection device according to any one of the above. 5. A connecting pipe having a branch port connected to the branch pipe, a branch port capable of forming a required gap on the outer peripheral surface of the connecting pipe and being fitted in a watertight manner, and a connecting pipe having a predetermined dimension. The pipe connection device according to any one of claims 1 to 4, further comprising locking means interposed between the communication pipe and the branch port so as to be slidable in the direction. 6. A bifurcated port, wherein a part of the inner peripheral surface has a spherical shape, a spherical ring capable of sliding while maintaining watertightness in the bifurcated port, and A communication pipe fitted with watertightness and capable of sliding relatively in the axial direction,
The pipe connection device according to any one of claims 1 to 4, wherein