JP4089794B2 - Pipe connection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe connecting device used when connecting a branch pipe to a fluid pipe such as a water main pipe.
[0002]
[Prior art]
A split T-shaped pipe A as a pipe connecting device as shown in FIGS. 4 and 5 is known as one that connects a branch pipe to a water main or the like.
[0003]
This conventional split T-shaped tube A is composed of three cases B1 and B2. Each case B1 and B2 is provided with a flange C. The cases are clamped by bolts and nuts E with the packing D sandwiched between the flanges C facing each other. In the first case B1, a branch port portion F connected to the branch tube K is provided at a right angle outward with respect to the tube axis, and the water main I and the branch tube K are provided inside the branch port portion F. The communication port F1 for communication is opened. Further, a plurality of fixing seats G are provided at both ends in the tube axis direction of each case so as to protrude. The fixing seat G is internally threaded, and fixing bolts H are screwed in from the outside to the inside. In the water main I, a branch water inlet J for passing water through the branch pipe K is perforated, and the split T-shaped pipe A faces the communication outlet F1 of the first case B1 to the branch water inlet J. According to the position, it is watertightly attached to the outer peripheral surface of the water main I. Further, the split T-shaped pipe A is fixed to the water main pipe I by strongly screwing the fixing bolt H so that the tip thereof bites into the outer peripheral surface of the water main pipe I.
[0004]
[Problems to be solved by the invention]
In the above pipe connecting device, a water main pipe and a branch pipe move relative to each other in various directions due to an earthquake, a ground subsidence, etc., and a bending, pulling or compressing force acts. When the water main pipe and the branch pipe move relative to each other in the pipe axis direction, a large force is concentrated on the base of the branch port portion of the first case, and there is a possibility that breakage or the like may occur. In addition, since the water pipe and the case are only tightened and fixed by fixing bolts, when the above-described force is applied, the pipe connecting device may move excessively and cause a water leakage accident.
[0005]
The problem to be solved by the present invention has been made to solve the above-mentioned problem, and prevents a large force from acting on the base of the branch port, etc., and at the same time, prevents water leakage due to movement of the fluid pipe and the case body. The object is to provide a pipe connecting device which can be prevented.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the pipe connection device of the present invention is divided in the radial direction with respect to the fluid pipe having the branch water passage, and maintains the water tightness by the left and right annular packings, and the circumferential direction. A pipe connection device comprising a case body rotatably connected to a branch port portion facing to the side,
A locking member that protrudes from the outer peripheral surface of the fluid pipe that is separated from the branch water passage port of the fluid pipe to one side, and that prevents the case body from moving in the pipe axis direction with respect to the fluid pipe;
A movement blocking member that is located outside the packing in the tube axis direction of the fluid pipe and is formed by a ring groove formed in the case body facing the locking member;
The ring groove of the movement preventing member is formed to have a groove width in which both side surfaces of the locking member are in contact with both side surfaces of the groove in the tube axis direction .
[0009]
The locking member is preferably 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.
[0010]
The branch port portion is connected to the branch tube, the branch port portion that can be fitted in a watertight manner by forming a required gap on the outer peripheral surface of the connection tube, and the connecting tube is slid in the axial direction by a predetermined dimension. It is preferable to be configured by a locking means interposed between the connecting pipe and the branch port portion so as to be able to.
[0011]
The branch port portion includes a branch port portion whose inner peripheral surface is spherical, a spherical ring that is slidable while maintaining water tightness in the branch port portion, and water tightness is retained in the spherical ring. And a connecting tube that can be fitted and slidable in the axial direction.
[0012]
According to the present invention, when a bending, pulling or compressing force is applied to the pipe connecting device due to an earthquake or ground subsidence, the fluid pipe and the case body rotate in the circumferential direction, and the branch port and the branch pipe are effective. By allowing the bending to be performed smoothly, it is possible to prevent a large force from acting on the base portion of the branch port portion or the like.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
1 and 2 show a first embodiment of the present invention, in which a case body 2 has water tightness on an outer peripheral surface of a water main pipe (fluid pipe) 1 made of ductile cast iron or the like embedded in the ground. It is held and installed. The case body 2 includes a first case 2 a and a second case 2 b that can be divided into two in the radial direction, and the packing 4 is in close contact with the outer peripheral surface of the water main pipe 1 in the packing grooves 3 at both ends thereof. 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 is applied to the case body 2 from the outside, the circumferential rotation along the pipe outer peripheral surface is possible. The case body 2 is not limited to two divisions and may be divided into a plurality of divisions such as three divisions.
[0015]
The first case 2a is integrally provided with a branch port portion 5 outwardly at right angles to the tube axis, and an annular packing groove 5a is engaged with the inner peripheral surface of the tip opening portion of the branch port portion 5. A stop convex portion (locking means) 5b is formed.
[0016]
The connecting pipe 6 has an outer diameter smaller than the smallest inner diameter portion of the branch port portion 5 and is attached to the branch port portion 5 via an annular packing 7 disposed in the annular packing groove 5a so as to be stretchable and flexible. It has been. A flange 8 for connecting the branch pipe 13 is provided at one end of the connecting pipe 6, and a stopper ring (locking means) 9 is provided at the other end for preventing the connecting pipe 6 from coming out by coming into contact with the locking projection 5 b. Is provided. The connecting pipe 6 may be externally fitted to the outer peripheral surface of the branch port portion 5 so as to be stretchable and flexible.
[0017]
A contact surface (movement-preventing member) 10 substantially perpendicular to the tube surface is provided outside the case body 2 in the tube axis direction, and a groove 11 is formed on the outer peripheral surface of the water main pipe 1 at a position in contact with the contact surface 10. A locking ring (locking member) 12 is formed in the groove.
[0018]
The locking ring 12 is divided into two parts, and stepped portions 12 a and 12 b 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.
[0019]
Even if a bending, pulling or compressing force is applied to the pipe connecting device of the present invention, it is absorbed by the circumferential rotation of the water main pipe 1 and the case body 2, and the force applied to the case body 2 is reduced. Moreover, since the abutment surface 10 is in contact with the locking ring 12 fixed to the water main 1, the water main 1 and the case body 2 do not move relative to each other in the axial direction so that water leaks. There is nothing wrong. Furthermore, the force applied to the case body 2 is reduced because the force is absorbed by the connecting tube 6 being bent or expanded or contracted with respect to the case body 2.
[0020]
Therefore, unlike the conventional case, there is no possibility that the base portion of the branch port portion 5 is cracked or the case body 2 moves in the axial direction and leaks.
[0021]
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 in the ground while maintaining water tightness. The case body 2 includes a first case 2 a and a second case 2 b that can be divided into two in the radial direction, and the packing 4 is in close contact with the outer peripheral surface of the water main pipe 1 in the packing grooves 3 at both ends thereof. It is attached to. As in the first embodiment, the case body 2 is in contact with the water main pipe 1 only with the packing 4, so that when the force is applied to the case body 2 from the outside, the circumferential rotation along the pipe outer peripheral surface is possible. is there.
[0022]
The first case 2a is integrally provided with a branch port portion 5 outwardly at right angles to the tube axis. An annular packing groove 5a and a spherical shape are formed on the inner peripheral surface of the tip opening portion of the branch port portion 5. A surface 5c is formed. A spherical ring 14 having an outer peripheral surface formed in a spherical shape inside the branch port portion 5 and an annular packing groove 14a and a locking projection 14b formed inside is fitted in a watertight manner via the annular packing 7. Yes. A push ring 15 having a spherical surface formed on the inner peripheral surface is fixed to the outside of the branch port portion 5 so as to prevent the spherical ring 14 from coming off.
[0023]
The connecting pipe 6 is inserted into the spherical ring 14 in a watertight manner via an annular packing 16 disposed in the annular packing groove 14a. A flange 8 for connecting the branch pipe 13 is attached to one end of the connecting pipe 6, and a stopper ring 9 is attached to the other end by a bolt that abuts the locking projection 14 b and prevents the connecting pipe 6 from coming out. Yes.
[0024]
A ring groove (annular groove) 18 having substantially the same width as the locking ring 12 opening radially inward is formed outside the packing groove 3 of the case body 2 in the tube axis direction. The locking ring (locking member) 12 is arranged so as not to move.
[0025]
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 center distance between the left and right ring grooves 18 of the case body 2, and the divided locking rings 12 are formed in the grooves 11. It is attached. Since both surfaces of the ring groove 18 in the tube axis direction are in contact with both side surfaces of the locking ring 12, movement to both the left and right sides can be prevented only by installing the locking ring 12 in one place.
[0026]
Even if a bending, pulling or compressing force is applied to the pipe connecting device of the present invention, it is absorbed by the circumferential rotation of the water main pipe 1 and the case body 2, and the force applied to the case body 2 is reduced. In addition, since a spherical ring is added to the branch port portion, the bending angle between the branch port portion and the connecting pipe can be increased, so that the force applied to the case body 2 is reduced.
[0027]
Therefore, unlike the conventional case, there is no possibility that a crack will occur at the base of the branch port part or the case body moves in the axial direction and leaks.
[0028]
The present invention is not limited to the above embodiments.
[0029]
In the case of the second embodiment, two locking rings 12 are attached, but may be one. Further, the ring groove 18 may be provided separately from the case body.
[0030]
The locking ring 12 may be divided not only into two parts but also into a plurality of parts.
[0031]
The branch pipe may be attached to the gate valve after the gate valve is attached to the connecting pipe.
[0032]
【The invention's effect】
According to the present invention, the fluid pipe and the case body rotate in the circumferential direction, permitting relative bending, and suppressing the occurrence of damage such as cracks at the branch port base. Further, since the locking member and the movement preventing member are in contact with each other by both side surfaces , relative movement in the axial direction across the fluid pipe and the branch water passage port of the case body is prevented, and leakage due to movement is suppressed.
[0034]
Further, since only one locking member is required, it is economical.
[0035]
According to the invention of claim 2 , the locking member is securely fixed to the fluid pipe.
[0036]
According to the third and fourth aspects of the present invention, the branch port portion and the branch pipe can be relatively bent and expanded and contracted, so that the force acting on the base portion of the branch port portion can be additionally suppressed.
[0037]
[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 cross-sectional view showing a locking ring, similarly.
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]
1 Water main (fluid pipe)
2 Case body 2a First case 2b Second case 3 Packing groove 4 Packing 5 Branch port 5a Annular packing groove 5b Locking projection (locking means)
5c Spherical surface 6 Connecting pipe 7 Annular packing 8 Flange 9 Stopper ring (locking means)
10 Contact surface (movement blocking member)
11 Groove 12 Locking ring (Locking member)
12a, 12b Step 13 Branch pipe 14 Spherical ring 14a Annular packing groove 14b Locking projection 15 Push ring 16 Annular packing 17 Bolt 18 Ring groove (annular groove)
A Split T-shaped pipes 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 J Branch water channel K Branch tube

Claims (4)

A case body that is divided in a radial direction with respect to a fluid pipe having a branch water passage opening and that is watertight by left and right annular packings and is rotatably connected in the circumferential direction, and faces the side. A pipe connection device comprising a branch port,
A locking member that protrudes from the outer peripheral surface of the fluid pipe that is separated from the branch water passage port of the fluid pipe to one side, and that prevents the case body from moving in the pipe axis direction with respect to the fluid pipe;
A movement blocking member that is located outside the packing in the tube axis direction of the fluid pipe and is formed by a ring groove formed in the case body facing the locking member;
The ring connecting device according to claim 1, wherein the ring groove of the movement preventing member is formed to have a groove width in which both side surfaces of the locking member are in contact with both side surfaces of the groove in the tube axis direction . The pipe connecting 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 the outer peripheral surface of the fluid pipe. The branch port portion is connected to the branch tube, the branch port portion that can be fitted in a watertight manner by forming a required gap on the outer peripheral surface of the connection tube, and the connecting tube can slide in the axial direction by a predetermined dimension. the communication pipe branch opening tube connecting device according to claim 1 in which the locking means are interposed, in which is formed between the as. The branch port portion has a branch port portion having a spherical inner surface part, a spherical ring that can slide while maintaining water tightness in the branch port portion, and water tightness in the spherical ring. fitted Te, the tube connecting device according to claim 1 in which the connecting pipe can slide relatively in the axial direction, in configured.

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