JP4120995B2 - Pipe connection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe connection device used when connecting a branch pipe to a fluid pipe such as a water main pipe without stopping the flow of the fluid pipe.
[0002]
[Prior art]
FIG. 5 shows an example of a conventional pipe connection device for connecting a branch pipe to a water main pipe or the like, and one side of a split T-shaped pipe A attached to the outer peripheral surface of a fluid pipe P through a packing C in a watertight manner. Further, a branch port portion B facing sideways is connected, and a gate valve device D is connected to a flange formed at an end portion of the branch port portion B.
[0003]
In order to branch the water in the fluid pipe P into the branch pipe G, first, the valve body E of the gate valve device D is pulled up and retracted from the flow path, and a perforator attached to the flange of the gate valve device D ( A branch hole F is formed in the side wall of the fluid pipe P by advancing the cutter (not shown) toward the branch port B side.
[0004]
Then, the cutter is pulled back to the punching machine side, the valve body E is lowered to close the flow path, the punching machine is removed from the gate valve device D, and the branch pipe G is connected to the flange of the gate valve device D.
[0005]
Next, when the valve body E is pulled up, the water in the fluid pipe P can be branched to the branch pipe G side in a state where water is allowed to flow into the fluid pipe P.
[0006]
The fluid pipe and the branch pipe are provided with a receiving portion in which one end is formed with a groove that accommodates a lock ring for preventing slipping and an enlarged diameter portion that accommodates packing, and the other end. The pipe is a pipe with an insertion part formed with an annular convex part that engages with the lock ring, and it is a seismic resistant pipe using a joint with a pull-out prevention mechanism ing.
[0007]
[Problems to be solved by the invention]
The above pipe connection device is buried in the ground together with the fluid pipe and the branch pipe, and the pipe and the pipe pipe are bent by the relative movement of the fluid pipe and the branch pipe in various directions due to an earthquake or ground subsidence. Or tensile or compressive force is applied.
[0008]
Fluid pipes and branch pipes are piped with earthquake-resistant joints that have a pull-out prevention mechanism, so each pipe line is seismic-proof, but the connection between the end of the gate valve device in the pipe connection device and the branch pipe Has been performed by flange joints in which water is sandwiched between the flanges formed in the pipe shaft in the tube axis direction. This flange joint is a joint that has the property of leaking water when force is applied and the flange opens even a little. When a branch pipe is joined using a conventional pipe connection device, the force is applied by an earthquake or ground subsidence. Then, there was a risk of causing a water leakage accident at the flange joint.
[0009]
The problem to be solved by the present invention is to solve the above problems, and is to provide a pipe connection device that does not leak even if a force is applied in the connection between the pipe connection device and the branch pipe. .
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the pipe connection device of the present invention is provided with a connection part for connecting a branch pipe and a drilling machine to the branch port part of the split T-shaped pipe formed with a side branch part. A formed gate valve device is provided, and at least an inner peripheral surface of the branch pipe is provided with a lock ring and a packing, and an outer peripheral surface of the connecting portion has an annular convex portion that prevents the branch pipe from coming out. It is characterized by being provided.
Due to this feature, after the fluid pipe is pierced by a piercing machine attached to the connection part of the gate valve device and water is branched to the branch pipe side, the annular pipe provided on the outer peripheral surface of the connection part when connecting the branch pipe Although the convex portion is arranged on the inner peripheral surface of the branch pipe, the branch pipe is prevented from coming out by engaging with the lock ring, and the packing accommodated in the branch pipe is removed from the outer peripheral surface of the connection section and the connection section. Since the water can be stopped by being sandwiched in the radial direction by the inner peripheral surface of the fitted branch pipe, water leaks at the joint between the pipe connection device and the branch pipe even when force is applied due to an earthquake or land subsidence. There is no.
[0011]
It is preferable that the punching machine is attached via a joint adjusting device fitted on the connecting portion.
If it does in this way, it is not necessary to manufacture a drilling machine according to the shape of a joined part, and since it can be used for a pipe connecting device having various joined parts with one drilling machine, it becomes economical.
[0012]
The joint adjusting device is composed of a receiving part that is water-tightly fitted to the connection part via packing, a plurality of fixing bolts that contact the connection part, and a flange part to which the drilling machine is attached. preferable.
If it does in this way, it will become easy to match | combine the branch port part of a pipe connection apparatus, and the core of a drilling machine by adjusting a fixing bolt, and can shorten work time.
[0013]
It is preferable that an engagement piece protruding in an outer diameter direction is provided on the outer peripheral surface of the connection portion, and a groove portion into which the engagement piece is fitted is provided in the joining adjusting device.
In this way, the groove portion of the joint adjusting device can be engaged with the engaging piece of the connecting portion and connected to the flange portion so that the drilling machine can be attached to the flange portion. The rotation of the drilling machine can be prevented.
[0014]
It is preferable that the front end of the drilling machine is a receiving part for receiving the connecting part, and the connecting part and the receiving part are fitted in a watertight manner through packing. If it does in this way, since a drilling machine can be directly attached to a connection part, work time can be shortened.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
1 to 4 show a pipe connecting device 1 according to an embodiment of the present invention. FIGS. 1 and 2 show a state in which a branch pipe 2 is connected to the pipe connecting device 1.
[0017]
A split T-shaped tube 4 is mounted on the outer peripheral surface of a fluid tube 3 made of ductile cast iron or the like embedded in the ground while maintaining watertightness. The split T-shaped tube 4 includes a first case 4a and a second case 4b that can be divided into two in the radial direction, and the packing 5 is mounted so as to be in close contact with the outer peripheral surface of the water main tube 1 and the first case 4a. Yes. The split T-tube 4 is not limited to two divisions, and may be divided into a plurality of divisions such as three divisions.
[0018]
In the first case 4a, a branch port portion 6 is formed integrally with the tube shaft at a right angle outward, and a partition provided with a valve body 7b that moves up and down by the valve shaft 7a at the tip of the branch port portion 6. The valve device 7 is provided integrally.
[0019]
A connecting portion 7c for connecting the branch pipe 2 is provided at the tip of the gate valve device 7, and an annular convex portion 7d having a tapered taper surface is provided at the tip of the outer peripheral surface of the connecting portion 7c so as to protrude in the outer diameter direction. In the base portion of the connection portion 7, engagement pieces 7 e having a predetermined width are formed at two locations on the upper and lower sides and project in the outer diameter direction. The engagement pieces 7e are not limited to two places at the top and bottom, but may be provided at four places at the top, bottom, left and right, or may be equally provided at six places.
[0020]
The connection portion 7c is fitted with a receiving portion 2a of the branch pipe 2, and the receiving portion 2a has an annular groove 2b in which the lock ring 8 is accommodated and an enlarged diameter portion in which the water blocking packing 9 is accommodated. 2c is formed, the lock ring 8 engages with the annular convex portion 7d of the connecting portion 7c, and the water blocking packing 9 is sandwiched between the inner peripheral surface of the receiving portion 2a and the outer peripheral surface of the connecting portion 7c and compressed in the radial direction. The water has been stopped.
[0021]
FIG. 3 shows a state in which the fluid pipe 3 is perforated by using the pipe connecting device 1, and the joining adjusting device 10 attaches the annular packing 12 to the connecting portion 7 c of the pipe connecting device 1 that is watertightly attached to the fluid pipe 3. And is fixed by a fixing bolt 11 screwed inwardly in a direction perpendicular to the pipe axis, a drilling machine is attached to the flange portion 10b of the joint adjusting device 10, and a branch hole 3a is provided in the fluid pipe 3. It is perforated by a cutter 14 of a perforator.
[0022]
As shown in FIG. 4, the joining adjusting device 10 is composed of a receiving port portion 10a fitted on the connecting portion 7c and a flange portion 10b for connecting the drilling machine, and the tip gate valve device 7 of the receiving port portion 10a. Four groove portions 10c that engage with the engagement pieces 7e are provided on the side, and an enlarged diameter portion 10d in which the annular packing 12 is disposed is formed on the inner peripheral surface, and a female screw portion 10e into which the fixing bolt 11 is screwed. Are formed at four points on the distal end side of the enlarged diameter portion 10d. The flange portion 10b is formed with a female screw portion 10f into which a mounting bolt 13 for attaching the drilling machine is screwed.
[0023]
In order to connect the branch pipe 2 using the pipe connection device 1 of the present invention, first, the split T-shaped tube 4 is attached to the outer peripheral surface of the fluid pipe 3 in a watertight manner, and the receiving portion 10a of the joint adjusting device 10 is expanded. It fits watertightly to the connection part 7c through the water stop packing 9 fitted to 10d. The groove portion 10c of the receiving portion 10a is engaged with the engaging piece 7e of the connecting portion 7c, and the fixing bolt 11 screwed into the female screw portion 10e of the receiving portion 10a is brought into contact with the outer peripheral surface of the screwed connecting portion 7c. The branch port portion 6 and the joining adjusting device 10 are fixed while aligning the cores, and the drilling machine is fixed to the joining adjusting device 10 by screwing the mounting bolt 13 into the female screw portion 10f of the flange portion 10b.
[0024]
Next, the valve body 7b of the gate valve device 7 is raised, and the cutter 14 of the perforator is sent out to the fluid pipe 3 side to perform perforation. A branch hole 3a is formed in the fluid pipe 3 to complete the drilling.
[0025]
After the cutter 14 is pulled back to the punching machine side, the valve element 7b of the gate valve device 7 is lowered, the branch port 6 side is stopped, and the punching machine and the joint adjusting device 10 are removed.
[0026]
The receiving part 2a of the branch pipe 2 in which the lock ring 8 and the water stop packing 9 are fitted is externally fitted to the connection part 7c to complete the connection of the branch pipe 2. Finally, the valve body 7b is raised to branch the fluid in the fluid pipe 3 to the branch pipe 2 side.
[0027]
The lock ring 8 fitted in the annular groove 2b of the branch pipe 2 engages with the annular convex part 7d of the connecting portion 7c to prevent the branch pipe 2 from coming out, and the water blocking packing 9 is connected to the inner peripheral surface of the branch pipe 2. Since the outer peripheral surface of the connecting portion 7c is compressed and stopped in the radial direction, even if the fluid pipe 3 and the branch pipe 2 are relatively moved in various directions due to an earthquake or ground subsidence, the pipe connecting device 1 and No water leaks at the connecting portion 7c with the branch pipe 2.
[0028]
The present invention is not limited to the above embodiments.
[0029]
In the embodiment, the internal thread portion for screwing the bolt is formed on the flange portion of the joint adjusting device. However, a bolt hole for inserting the bolt may be formed, and the drilling machine may be attached to the joint adjusting device with the bolt and nut. .
[0030]
In the embodiment, the branch pipe is connected to the connection portion in a slip-on manner, but the press ring is externally fitted to the connection portion, and tightened while pushing the packing to the flange provided at the end of the branch pipe with bolts and nuts. A branch pipe may be connected.
[0031]
【The invention's effect】
According to the present invention, the fluid pipe is perforated by the perforator attached to the connection part of the gate valve device and the water is branched to the branch pipe side. The ring-shaped convex portion engages with a lock ring disposed on the inner peripheral surface of the branch pipe to prevent the branch pipe from coming out, and the packing accommodated inside the branch pipe is connected to the outer peripheral surface of the connection section and the connection section. Water can be stopped by being sandwiched in the radial direction by the inner peripheral surface of the externally fitted branch pipe, so that water leaks at the junction between the pipe connection device and the branch pipe even when force is applied due to an earthquake or land subsidence. There is nothing.
[0032]
According to the second aspect of the present invention, it is not necessary to manufacture a drilling machine in accordance with the shape of the joint, and it can be used for a pipe connecting device having various joints with one drilling machine. Is.
[0033]
According to the invention of claim 3, by adjusting the fixing bolt, it is easy to align the branch port portion of the pipe connecting device and the core of the drilling machine, and the working time can be shortened.
[0034]
According to the fourth aspect of the present invention, the groove portion of the joining adjusting device can be engaged with the engaging piece of the connecting portion and connected, and the drilling machine can be attached to the flange portion. Can be received by the engaging piece, so that the drilling machine can be prevented from rotating.
[0035]
According to invention of Claim 5, since a drilling machine can be directly attached to a connection part, working time can be shortened.
[0036]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along line II showing a first embodiment of the present invention.
FIG. 2 is a front view of the same.
FIG. 3 is a cross-sectional view showing when the drilling machine is installed.
4A is a cross-sectional view of a bonding adjusting device, and FIG. 4B is a front view.
FIG. 5 is a central longitudinal side view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe connection apparatus 2 Branch pipe 2a Receiving part 2b Annular groove 2c Expanding part 3 Fluid pipe 3a Branching hole 4 Split T-shaped pipe 4a 1st case 4b 2nd case 5 Packing 6 Branching port part 7 Gate valve apparatus 7a Valve shaft 7b Valve body 7c Connection part 7d Annular convex part 7e Engagement piece 8 Lock ring 9 Water stop packing 10 Joining adjustment device 10a Receiving part 10b Flange part 10c Groove part 10d Large diameter part 10e Female thread part 10f Female thread part 11 Fixing bolt 12 Annular packing 13 Mounting bolt 14 Cutter

Claims (5)

The branch port portion of the split T-shaped tube formed with a side branch port portion is provided with a gate valve device in which a connection portion for connecting the branch tube and the perforator is formed. A pipe connection device, wherein a lock ring and a packing are disposed on an inner peripheral surface, and an annular convex portion for preventing the branch pipe from coming out is provided on the outer peripheral surface of the connection portion. The pipe connecting device according to claim 1, wherein the punching machine is attached via a joint adjusting device fitted on the connecting portion. 3. The joint adjusting device includes a receiving portion that is water-tightly fitted to the connection portion via a packing, a plurality of fixing bolts that contact the connection portion, and a flange portion to which a drilling machine is attached. A pipe connecting device according to claim 1. The pipe according to claim 2 or 3, wherein an engagement piece projecting in an outer diameter direction is provided on an outer peripheral surface of the connection portion, and a groove portion into which the engagement piece is fitted is provided in the joining adjusting device. Connected device. The tube according to claim 1, wherein a tip of the drilling machine serves as a receiving portion for receiving the connecting portion, and the connecting portion and the receiving portion are fitted in a watertight manner through packing. Connected device.

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