JP2545008Y2 - Captive fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a pipe joint for preventing separation.
In particular, the present invention relates to a separation prevention pipe joint that can be suitably applied to a bent portion of an exposed pipe in a common ditch or a tunnel.

[0002]

2. Description of the Related Art Hitherto, a separation-preventing pipe joint having an earthquake-resistant function for preventing a final separation while permitting a certain amount of insertion / removal operation between a receiving port and an insertion port during an earthquake has been known. .

In the case of a buried pipeline, even if a break-out force acts on the bent portion of the pipeline due to water pressure or dynamic pressure caused by a water flow, the buried pipeline is supported by the surrounding soil. Although a detachment prevention fitting having such a seismic function can be applied as it is, the exposed pipe 31 in the common groove 30 and the exposed pipe in the tunnel as shown in FIG. In order to support the exit force, it is necessary to fix the bent portion 32 of the pipe 31 to an anchor block 34 or the like fixed to a common groove or a wall surface of a tunnel. In FIG. 6, reference numeral 33 denotes a movable pipe support for supporting the pipe 31.

[0004]

However, if the bent portion 32 of the pipe 31 is fixed to the wall surface of the common groove 30, a pull-out force acts on the common groove 30, which is not preferable. When the joint portion such as the common groove 30 moves largely due to the occurrence of the bending, the bent portion 32 of the pipe 31 moves together with it, thereby impairing the seismic resistance function of the pipe itself. There is a problem that there is a danger of getting out due to excessive force.

An object of the present invention is to solve the above-mentioned problem, and it is an object of the present invention to provide a detachment prevention pipe joint which normally withstands a pull-out force due to water pressure and exhibits an earthquake-resistant function in an earthquake.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a projecting device which inserts an insertion port into a receiving port, and which is provided on a lock ring mounted on the inner periphery of the receiving port on the outer periphery of the distal end portion of the receiving port. The engagement member that engages with the lock ring in a state where a gap is provided in the pipe axis direction between the lock ring and the protrusion in the disengagement prevention pipe joint in which It is provided at a position between the protruding portions, and the engaging member is fixed by welding so as to come off from the outer periphery of the insertion opening when a load more than a predetermined value is applied.

In addition, the present invention prevents the disengagement by inserting the spout into the socket and engaging the protrusion protruding from the outer periphery of the front end of the spout with the lock ring attached to the inner circumference of the socket. in the pipe joint, provided <br/> a weld bead which engages the locking ring in a state in which a distance in the tube axis direction between the lock ring and the projection at a position between the locking ring and projections in the spigot periphery In addition, the weld bead is characterized by being broken when a load exceeding a predetermined level is applied and coming off the outer periphery of the insertion hole.

[0008]

When the detachment preventing pipe joint of the above construction is applied to a bent portion of a pipeline, a pull-out force caused by hydraulic pressure which is constantly applied is supported by the engagement between the lock ring of the insertion port and the engagement member or the weld bead, and is received. The opening of the mouth and the insertion opening is prevented. On the other hand, if a large external force is applied during an earthquake or the like, the engaging member will be disengaged or the weld bead will be damaged. It can be moved and exhibits seismic resistance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 showing a first embodiment of the present invention, reference numeral 1 denotes a receiving port, 2 denotes an insertion port inserted into the receiving port 1,
A tapered sealing surface 4 into which the sealing material 3 is press-fitted is formed at the opening end of the inner peripheral surface of the receiving port 1, and a lock ring groove 5 is formed at the back. The lock ring groove 5 is provided with a lock ring 6 which can be inserted through a gap between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 2 and has a biasing force for expanding the diameter. On the outer periphery of the tip of the insertion port 2,
An annular protrusion 7 that can be engaged in the pipe axis direction is fixed to the lock ring 6 by welding. Reference numeral 8 denotes a backup ring interposed between the seal member 3 and the lock ring 6. The engagement surface between the backup ring 8 and the lock ring 6 is formed as a tapered surface, and the lock ring is formed by reducing the diameter of the lock ring 6. It is configured to prevent detachment from the groove 5. Reference numeral 9 denotes a pressing ring disposed opposite to the opening end face of the receiving port 1, the opening flange 1 a of the receiving port 1 and the bolt / nut 1.
By pressing at 0, the sealing material 3 is pressed toward the back of the receiving port 1. The pressing wheel 9 is fitted to the outer periphery of the pressing ring 9 before the projection 7 is attached by welding.

In this embodiment, the projection 7 at the distal end of the insertion port 2 is located at an intermediate position with respect to both the lock ring 6 and the inner rear end 1b of the receptacle 1. In this state, an engagement member 11 that engages with the lock ring 6 from the back side of the receiving port 1 is provided on the outer peripheral surface of the insertion port 2. The engaging member 11 is attached by welding 12 having a small joining strength. The welding 12 is configured to sufficiently withstand the withdrawal force due to water pressure, and to be damaged when a predetermined withdrawal force is applied.

According to the above-described detachment prevention pipe joint, the release force due to the water pressure that always acts between the receiving port 1 and the insertion port 2 is reduced by the engagement between the lock ring 6 of the receiving port 1 and the engaging member 11 of the insertion port 2. Since they are supported at the same time, the receiving port 1 and the insertion port 2 are reliably prevented from coming off. On the other hand, if a large external force acts during an earthquake or the like, the welding 12 that attaches the engaging member 11 to the insertion opening 2 is broken, and the engaging member 11 comes off the outer peripheral surface of the insertion opening 2. The port 2 is relatively movable in the axial direction of the tube to a position where the lock ring 6 and the projection 7 are engaged via the engagement member 11, thereby exhibiting an earthquake-resistant function.

Thus, when the detachable pipe joint having the above structure is applied to the exposed pipe 31 in the common groove 30 as shown in FIG. 5, the entire pipe 31 including the bent portion 32 is placed on the movable pipe support 33. It is not necessary to provide an anchor block or the like for fixing.

FIG. 1 illustrates a basic configuration of a separation prevention pipe joint which is applied to a relatively small diameter pipe line having a diameter of 450 mm or less. However, as shown in FIG. 2, it is applied to a large diameter pipe line. Similarly, the present invention can be applied to a detachment prevention fitting.

In FIG. 2, a deep lock ring groove 15 is formed in the inner peripheral surface of the receiving port 1 to increase the engagement holding force of the lock ring 16 with respect to the receiving port 1, and one place having a diameter reducing urging force. A split lock ring 16 is used, and accordingly, a backup ring 18 having a rectangular cross section is used. Further, the pressing wheel 19 is provided with the protrusion 7.
The first ring 19a is divided into a plurality of divided first rings 19a that abut against the sealing material 3 and an annular second ring 19b that engages with the outer periphery of the first ring 19a. Further, bolts and nuts 20 for fastening the press ring 19 are planted on the open end surface of the receiving port 1.

It is needless to say that the example of FIG. 2 has the same operation as that of FIG. As a specific numerical example, a water pressure of 5 kgf / cm ^{2 is applied to} a pipe joint having a diameter of 450 mm.
Is 8.9 tons. On the other hand, when the engaging member 11 is attached by welding 12 having a leg length of 5 mm and a welding length of 380 mm, the detachment preventing force of the engaging member 11 becomes 27 tons, and when a force greater than that is applied, the seismic function is not performed. Be demonstrated. In the case of a pipe joint having a diameter of 700 mm, the withdrawal force due to the same hydraulic pressure is 21.1 tons. On the other hand, when the engaging member 11 is attached by welding 12 having a leg length of 5 mm and a welding length of 900 mm, the detachment preventing force is generated. Is 64 tons.

Next, a second embodiment of the present invention and its modifications will be described with reference to FIGS. The same components as those described with reference to FIGS. 1 and 2 are denoted by the same reference numerals, and the description of the configuration and operation will be omitted. Only different points will be described.

In this embodiment, instead of the engaging member 11 in the first embodiment, a weld bead 21 raised on the outer peripheral surface of the insertion port 2 is directly engaged with the lock rings 6 and 16, and is always used. The welding bead 21 prevents the insertion hole 2 from coming out of the receptacle 1 and prevents the welding bead 21 from being damaged when an excessive force acts during an earthquake or the like, thereby exhibiting an anti-seismic function.

The present invention can be embodied in various modified forms within the scope of the claims other than the above embodiment.

[0019]

As described above, according to the disengagement-preventive pipe joint of the present invention, the withdrawal force due to the water pressure that always acts is supported by the engagement between the lock ring of the insertion opening and the engagement member or the weld bead. The receiving port and outlet are prevented from coming off due to water pressure, while if a large external force acts during an earthquake,
The receiving member and the insertion hole can be relatively moved in the pipe axis direction to the position where the lock ring and the projection are engaged by disengagement of the engaging member or breakage of the weld bead, so that a predetermined seismic function is exhibited. , Can be effectively applied to the bent portion of the exposed pipe.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention;

FIG. 2 is a sectional view of a modification in which the first embodiment is applied to another type of pipe joint.

FIG. 3 is a cross-sectional view of the second embodiment of the present invention;

FIG. 4 is a sectional view of a modification in which the second embodiment is applied to another type of pipe joint.

FIG. 5 is a plan view showing an exposed pipe state using the separation preventing pipe joint of each embodiment.

FIG. 6 is a plan view showing a state of an exposed pipe of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving port 2 Insertion port 6, 16 Lock ring 7 Projection part 11 Engaging member 12 Welding with weak joining force 21 Welding bead

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yo Nagai 2-26-26 Ohama-cho, Amagasaki City, Hyogo Pref. Inside the Kubota Mukogawa Works (56) References JP-B 62-4592 (JP, B2) JP-B 61-20758 (JP, B2) JP-B 62-3355 (JP, B2) JP-B 55-33519 (JP, B2) JP, B2)

Claims (2)

(57) [Scope of request for utility model registration] 1. A detachment prevention pipe joint in which an insertion opening is inserted into a receiving opening and a projection projecting from an outer periphery of a distal end portion of the insertion opening is engaged with a lock ring attached to an inner periphery of the receiving opening to prevent detachment. your engagement member that engages with the lock ring in the axial direction of the tube between the lock ring and the projection in a state in which a spacing spigot periphery
Kicking provided at a position between the locking ring and the projection, engaging the Katsuko
If member is anti-separation fittings, characterized in that more load given is stuck by welding it away spigot outside pressurized circumferential et al to act. 2. An insertion hole is inserted into the receptacle and the inner periphery of the receptacle.
Protruding from the outer periphery of the tip of the insertion hole on the lock ring attached to
Smoke prevention fitting with projections engaged to prevent disengagement
To provide an interval in the pipe axis direction between the lock ring and the projection.
The welding bead that engages with the lock ring in the
At the position between the lock ring and the projection
The weld bead breaks when a load exceeding the specified load is applied and
A detachment prevention pipe joint characterized by being detached from the outer periphery.