JPH11141779A - Pipe connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe connecting device which allows the escaping of a great force applied to the base part etc., of a branch opening part, and which prevents the leaking of water due to the excessive movement of a case in the direction of a pipe axis. SOLUTION: If a fluid pipe 1 moves relative to a branch pipe 13 in the direction of its pipe axis because of an earthquake or ground subsidence etc., a regulating device permits the relative movement of the fluid pipe 1 to a pipe connecting device over a predetermined distance and so can prevent the application of a force to the base part of the branch opening part 5 of the pipe connecting device. If the relative movement has exceeded a permissible range as the result of the further movement of the fluid pipe 1, the regulating device works to prevent the relative movement of the fluid pipe 1 to the pipe connecting device to prevent the leaking of water due to the movement. Also, since the branch opening part 5 and the branch pipe 13 are deflected, the application of a great force to the base part etc., of the branch opening part 5 is 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 pipe or the like, a split T-shaped pipe A as a pipe connecting device as shown in FIGS. 10 and 11 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 to release a large force applied to a base portion of a branch port portion and to excessively move a case body in a pipe axis direction. Another aspect of the present invention is to provide a pipe connection device that prevents water leakage due to a pipe.

[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 connection device comprising a case body and a branch port facing sideways, the case body allowing relative movement of a predetermined distance in a pipe axis direction between the fluid pipe and the case body. A restriction device for preventing relative movement of a predetermined distance or more is provided, and a bending device for bending the branch port and the branch pipe is provided at the branch port.

[0007] It is preferable that the restricting device comprises a locking piece that bites into the outer peripheral surface of the pipe in accordance with the relative movement of the fluid pipe and the case body in the pipe axis direction.

It is preferable that the case can be divided into a plurality in the radial direction.

The bending device includes a connecting pipe connected to the branch pipe, a branch port for forming a required gap between the connecting pipe and a watertight outer fitting, and connecting the connecting pipe by a predetermined dimension in the axial direction. And a locking means interposed between the connecting pipe and the branch port so that the connecting pipe can slide.

The bending device includes a branch opening part of which a part of the inner peripheral surface is spherical, a spherical ring slidable while maintaining water tightness in the branch opening, and a water tight seal in the spherical ring. And a connecting pipe which is fitted while holding the shaft and is relatively slidable in the axial direction.

According to the pipe connection device of the present invention, when the fluid pipe relatively moves in the pipe axis direction with respect to the branch pipe due to an earthquake, land subsidence, or the like, the regulating device sets the relative distance between the fluid pipe and the pipe connection apparatus at a predetermined distance. Since the movement is permitted, the force acting on the base of the branch port of the pipe connection device can be suppressed.
Further, when the fluid pipe moves and the relative movement exceeds the allowable range, the regulating device operates and the relative movement between the pipe connection device and the fluid pipe is prevented, so that water leakage due to the movement does not occur. In addition, since the branch port and the branch pipe are bent, a large force is prevented from acting on the base and the like of the branch port.

[0012]

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

FIG. 1 to FIG. 3 show a first embodiment of the present invention. The case body 2 is mounted while maintaining watertightness. The case body 2
First case 2a and second case 2b that can be divided into two in the radial direction
The packing 4 is mounted in the packing groove 3 at both ends so as to be in close contact with the outer peripheral surface of the water main 1. The case body 2 may be dividable into a plurality, 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 opening at the distal end 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 port portion 5 so as to be stretchable and flexible.

A ring groove (groove) 10 which opens radially inward is formed on the outer side of the packing groove 3 of the case body 2 in the tube axis direction, and the ring groove 10 is divided into a plurality of members in the circumferential direction. A stop ring (locking piece) 11 is mounted. An inner surface of the ring groove 10 in the tube axis direction is provided with a rotation stop surface 10a with which the locking ring 11 abuts and suppresses rotation thereof.

The push bolt (pressing portion) 12 is provided in the ring groove 1.
0 from the outside, and the locking ring 11 is
Is in contact with the outer circumference of the locking ring 11 so as to press against the outer circumference of the locking ring 11.

The locking ring 11 is rotatable in the axial direction of the pipe within the ring groove 10 as shown in FIG. 3, and is moved when the outer peripheral surface of the pipe moves away from the end of the case body 2. The sharp edge 11 a formed at the tip of the pipe 11 is formed in a cross-sectional shape that cuts into the outer peripheral surface of the water main 1. Accordingly, in FIG. 1, the right locking ring 11 rotates so as to bite into the outer peripheral surface of the water main 1 when the water main 1 moves rightward, and the left locking ring 11 When the pipe moves to the left, it rotates so as to bite into the outer peripheral surface of the water main 1.

When relative movement in the pipe axis direction occurs between the water main pipe 1 and the branch pipe 13 connected by the pipe connection device of the present invention, the water main pipe 1 and the case body 2 move relative to each other, thereby causing the case to move. The force applied to the body 2 is reduced. Furthermore, when the connecting pipe 6 bends or expands and contracts with respect to the case body 2, the force applied to the base of the branch opening of the case body 2 is reduced. Further, the relative movement between the water main 1 and the case body 2 increases the amount of the sharp blade 11a biting into the outer peripheral surface of the water main 1. When the locking ring 11 abuts against the rotation stop surface 10a of the ring groove 10 and rotation stops, the amount of bite is maximized and relative movement between the water main 1 and the case body 2 is prevented, so that the case body 2 does not move more than the predetermined movement amount and leaks.

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.

FIGS. 4 and 5 show a second embodiment of the present invention. Water mains made of ductile cast iron buried underground
A case body 2 is mounted on the outer peripheral surface of a (fluid pipe) 1 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.

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.

On the outer peripheral surfaces of both ends of the case body 2, there are formed flange portions 18 for locking a regulating member 19 described later. The regulating member 19 is divided into two parts in the radial direction, and has a ring groove 20a that opens radially inward.
0, an eave portion 21 formed integrally with the ring storage portion 20 and a protruding piece portion 22 that engages with the flange portion 18. Locking ring (locking piece) 11 is ring groove 20a
A push bolt (pressing portion) 12 is screwed in from outside the ring groove 20a so as to abut the outer periphery of the locking ring 11 in order to press the locking ring 11 against the outer peripheral surface of the water main pipe 1. I have. The restricting member 19 is provided between the end of the case body 2 and the ring storage portion 20 (x1) and the flange 1
8 is provided with a gap between the surface on the branch port side and the protruding piece 22 (x2). The locking ring 11 operates in the same manner as in the first embodiment.

When relative movement in the pipe axis direction occurs between the water main pipe 1 and the branch pipe 13 connected by the pipe connection device of the present invention, the case body 2 and the regulating member 19 form a gap at the flange 18. Since it is provided and attached, in addition to the amount of movement by the locking ring, the amount of movement in the axial direction is added, and the addition of a spherical ring at the branch port allows a large bending angle between the branch port and the connection pipe Therefore, 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.

FIG. 6 shows another embodiment of the regulating device according to the present invention.

A locking piece 23 having a spherical concave portion 23b formed on the top thereof and two sharp blades 23a provided on the fluid pipe side.
Are rotatably disposed in the groove 25 with the tip of the push bolt (pressing portion) 24 as a fulcrum. A push bolt 24 formed at the tip with a spherical convex portion 24a engaging with the spherical concave portion 23b is screwed into a groove 25 perpendicularly to the tube axis. A rotational stop surface 25a for preventing the locking piece 23 from over-rotating is formed at the front and rear of the groove 25 in the axial direction. The outer rotation stop surface 25a is perpendicular to the pipe axis,
The inner rotation stop surface 25a is provided so as to fall outward.

When the pipe connecting device is attached, the locking piece 23 has two sharp blades in contact with the outer peripheral surface of the fluid pipe, and is pushed by the push bolt 24 to bite into the fluid pipe by a predetermined amount. When the pipe connection device and the fluid pipe start to move relative to each other, the locking piece 23 rotates in the pipe axis direction with the spherical convex portion 24a of the push bolt 24 as a fulcrum. The locking piece 23 continues to rotate while increasing the bite amount with the relative movement, and stops rotating when it comes into contact with the outer rotation stop surface 25a as shown by the broken line. When the rotation of the locking piece 23 stops, the relative movement between the pipe connection device and the fluid pipe is prevented.

FIG. 7 shows another embodiment of the regulating device according to the present invention.

The locking portion 23 having a top portion formed in an arc-shaped cross section and having a sharp blade 23a on the fluid pipe side is rotatable about the tip of a push bolt (pressing portion) 24 as a fulcrum.
It is arranged in. A push bolt 24 having a conical tip is screwed into the groove 25 from the tube axis direction. A rotational stop surface 25a for preventing the locking piece 23 from over-rotating is formed at the front and rear of the groove 25 in the axial direction. The outer rotation stop surface 25a is provided to be perpendicular to the tube axis, and the inner rotation stop surface 25a is provided to fall outward.

When the pipe connection device is mounted, the locking piece 23 has the sharp blade 23a in contact with the outer peripheral surface of the fluid pipe, and is pushed by the push bolt 24 to bite into the fluid pipe by a predetermined amount. When the pipe connection device and the fluid pipe start to move relative to each other, the locking piece 23 rotates in the pipe axis direction with the contact point between the push bolt 24 and the conical portion as a fulcrum. The locking piece 23 continues to rotate while increasing the bite amount with the relative movement, and stops rotating when it comes into contact with the outer rotation stop surface 25a as shown by the broken line. When the rotation of the locking piece 23 stops, the relative movement between the pipe connection device and the fluid pipe is prevented.

FIG. 8 shows another embodiment of the regulating device according to the present invention.

An engaging piece 23 having an inclined surface 23c formed at an angle with respect to the pipe axis and having two sharp blades 23a on the fluid pipe side is provided on a flat surface of a push bolt (pressing portion) 24. It is disposed in the groove 25 so as to be slidable in contact with the portion 24b. A push bolt 24 having a flat surface portion 24b formed at the tip is screwed into the ring groove from a direction perpendicular to the inclined surface so that the inclined surface 23c and the flat surface portion 24b abut in parallel. At the front and rear in the axial direction in the groove 25, a movement stop surface 25b is formed which comes into contact with the locking piece and stops its movement.

When the pipe connecting device is attached, the locking piece 23 has two sharp blades in contact with the outer peripheral surface of the fluid pipe, and is pushed by the push bolt 24 to bite into the fluid pipe by a predetermined amount. When the pipe connection device and the fluid pipe begin to move relative to each other, the locking piece 23 slides in the pipe axis direction while the flat portion 24b of the push bolt 24 and the inclined surface 23c are in contact with each other. The locking piece 23 moves while increasing the bite amount due to the wedge action with the relative movement, and stops moving when it comes into contact with the outer movement stop surface as shown by the broken line.
When the movement of the locking piece 23 stops, the relative movement between the pipe connection device and the fluid pipe is prevented.

FIG. 9 shows another embodiment of the regulating device according to the present invention.

This regulating device includes a push bolt (pressing portion) 2
The female screw 23d into which the screw 4 is screwed is formed, the locking piece 23 provided with two sharp blades 23a on the fluid pipe side, and the inclined surface 25c angled with respect to the pipe axis are formed on the ceiling of the groove 25. A groove 25 having an inner surface, a long hole 25d extending in the pipe axis direction at the ceiling thereof, and a detent surface 25b formed on both surfaces in the axial direction, and a disk-shaped large-diameter portion contacting the inclined surface 25c. 24c is formed integrally with a push bolt 24 having a male screw portion 24d at the tip.

The locking piece 23 is screwed into the male screw portion 24d of the push bolt 24 inserted into the elongated hole 25d, and the large diameter portion 24c of the push bolt 24 and the inclined surface 25c are slidably inserted into the ring groove. It is arranged in.

When the pipe connection device is mounted, the locking piece 23 has two sharp blades in contact with the outer peripheral surface of the fluid pipe, and is pushed by the push bolt 24 to bite into the fluid pipe by a predetermined amount. When the pipe connection device and the fluid pipe start relative movement, the locking piece 23 moves together with the pipe, and the push bolt 24 screwed with the locking piece 23 also comes into contact with the large diameter portion 24c and the inclined surface 25c. While sliding in the tube axis direction. The locking piece 23 has a large diameter portion 24c and an inclined surface 25c.
It moves while increasing the amount of bite due to the wedge action, and stops moving when it comes into contact with the outer detent surface as shown by the broken line. When the movement of the locking piece 23 stops, the relative movement between the pipe connection device and the fluid pipe is prevented.

The present invention is not limited to the above embodiment.

In the first embodiment, the right locking ring 11
Is provided so as to bite into the outer peripheral surface of the water main 1 when the water main 1 moves to the right, but is provided on the outer peripheral surface of the water main 1 when the water main moves to the left. You may provide so that it may bite.

Although the locking piece in the embodiment is shown to act only in one direction, in the embodiment shown in FIG. 6, sharp blades are provided on the left and right sides so as to act on either left or right movement. In the embodiment shown in FIG. 7, the inclined surface of the locking piece is provided on both the left and right sides, and an auxiliary member abutting on the inclined surface is interposed between the push bolt and the locking piece. It may be made to act also on the movement of.

Further, two restricting devices are provided at both ends of the case body.
It may be a place.

The branch pipe may be attached to the gate valve after the gate valve is attached to the connecting pipe.

[0045]

According to the present invention, since the fluid pipe and the case body move relative to each other and the branch port and the branch pipe are bent, the occurrence of damage such as a crack at the base of the branch port can be suppressed. Also, since the relative movement between the fluid pipe and the case body is prevented,
Water leakage when the case body moves more than a predetermined movement amount is prevented.

According to the second aspect of the present invention, the relative movement is reliably prevented by the locking piece that is engaged by the relative movement even if the initial pressing force is small.

According to the third aspect of the present invention, since the case body is divided, it can be attached to an existing pipe.

According to the fourth and fifth 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.

[0049]

[Brief description of the drawings]

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

FIG. 2 is also a partially cutaway side view.

FIG. 3 is an enlarged sectional view showing a locking ring.

FIG. 4 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view showing the regulating member.

FIG. 6 is a sectional view showing another embodiment of the regulating device according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the regulating device according to the present invention.

FIG. 8 is a sectional view showing another embodiment of the regulating device according to the present invention.

FIG. 9 is a sectional view showing another embodiment of the regulating device according to the present invention.

FIG. 10 is a partially cutaway front view showing a conventional example.

FIG. 11 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 Ring groove (groove) 10a Rotation stop surface 11 Locking ring (locking piece) 11a Sharp blade 12 Push bolt (pressing part) 13 Branch pipe 14 Spherical ring 14a Ring packing groove 14b Engagement convex part 15 Press ring 16 Ring packing 18 Flange part 19 Restriction member 20 Ring storage part 20a Ring groove 21 Eave part 22 Protrusion part 23 Engagement piece 23a Sharp blade 23b Spherical concave part 23c Inclined surface 23d Female screw part 24 Push bolt 24a Spherical convex part 24b Flat part 24c Large diameter part 24d Male screw part 25 Groove part 25a Rotation stop surface 25b Transfer Detent surface 25c Inclined surface 25d Slotted hole 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 port K Branch tube

Claims (5)

[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. The case body is provided with a regulating device that allows relative movement of a predetermined distance in the pipe axis direction between the fluid pipe and the case body and prevents relative movement of a predetermined distance or more. A pipe connection device, wherein a bending device is provided in the portion to allow bending of the branch port and the branch pipe. 2. The pipe connection device according to claim 1, wherein the restricting device comprises a locking piece that bites into an outer peripheral surface of the pipe with a relative movement of the fluid pipe and the case body in the pipe axis direction. 3. The pipe connection device according to claim 1, wherein the case body can be divided into a plurality of pieces in a radial direction. 4. A bending device comprising: a connecting pipe connected to a branch pipe; a branch port for forming a required gap between the connecting pipe and a watertight outer fitting; The pipe connection device according to any one of claims 1 to 3, further comprising locking means interposed between the communication pipe and the branch port so as to be slidable in the direction. 5. A bending device comprising: a branch opening part of which a part of an inner peripheral surface is spherical; a spherical ring slidable while maintaining watertightness in the branch opening; and a watertight seal in the spherical ring. A communication pipe fitted while maintaining the property and slidable relatively in the axial direction,
The pipe connection device according to any one of claims 1 to 3, comprising: