JPH08166096A - Separationproof pipe joint - Google Patents

Abstract

PURPOSE: To provide a separationproof function easily to an ordinary extension/ contraction pipe joint on a work site. CONSTITUTION: An annular seal member 16 is compressed in between the inside of a receiving mouth 12 and an outside of an insertion mouth 14. A protrusion portion 18 is annular form is welded on outer periphery of the insertion mouth outward of the receiving mouth 12. A cup 21 in annular form, to be engaged with the protrusion portion 18, is externally placed between a position away from the receiving mouth 12, concerning the protrusion portion 18 in the insertion mouth 14, and a portion beyond a collar portion 17 of the receiving mouth 12. A lock ring 30 freely opening is placed in an annular groove 28 formed on inner periphery of the cup 21 at a position corresponding to a receiving mouth portion beyond the collar portion 17. Due to a set bolt 31, the lock ring 30 is reduced in radius, so that the lock ring 30 is engaged in between the annular groove 28 and the collar portion 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation prevention pipe joint.

[0002]

2. Description of the Related Art As a type of pipe joint, there is known one in which an annular sealing material is compressed between an inner surface of a receiving port and an outer surface of an insertion port. This pipe joint can only be inserted into the inside of this receiving port with the annular sealing material left in the receiving port.
It is called a slip-on type pipe joint because it can exert a predetermined sealing function by compressing the sealing material between the receiving and inserting ports.

This slip-on type pipe joint is
As described above, it has a sufficient expansion and contraction function because it has a structure in which the insertion port is inserted into the receiving port and the sealing material is simply compressed. However, in some cases, it may be desirable to provide a slip-on type pipe fitting with a separation prevention function that prevents expansion and contraction.In such a case, an annular groove should be provided on the inner circumference of the receiving opening and the outer circumference of the insertion opening. In general, the lock ring is engaged with the both annular grooves.

[0004]

However, in such a case, the pipe for the pipe joint having the expansion and contraction function and the pipe for the pipe joint having the separation prevention function are provided with the receiving port and the insertion port, respectively. The structure is different. For this reason, for example, when it is desired to appropriately select and use a pipe joint having an expansion / contraction function and a pipe joint having a detachment prevention function according to the situation of the laying site along the pipe, There is a problem in that the pipes for this purpose must be prepared.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve such a problem and to make it possible to easily use an ordinary expansion-contraction pipe joint as a separation-prevention pipe joint at a construction site.

[0006]

In order to achieve this object, the present invention provides a pipe joint for compressing an annular sealing material between the inner surface of the receiving opening and the outer surface of the receiving opening. Welding an annular protrusion on the outer periphery, forming a collar portion on the outer periphery of the opening of the receiving opening, from the position farther from the receiving portion than the protruding portion in the insertion opening over the receiving portion beyond the brim portion Provided with an annular cup that is fitted on the outside and is capable of engaging with the protrusion, an openable lock ring is provided in an annular groove formed on the inner circumference of the cup corresponding to the receiving portion beyond the brim. The lock ring is housed and screwed from the outer surface of the cup into the annular groove to reduce the diameter of the lock ring, and a set bolt for engaging the lock ring with the annular groove and the collar portion is provided.

[0007]

According to this structure, the cup engages with the protrusion of the insertion opening, and the lock ring engages with the annular groove of the cup and the flange portion of the reception opening, so that the cup is separated from the insertion opening. Preventive function is added. At that time, by simply fitting the cup on the outer circumference of the insertion opening of the ordinary telescopic pipe joint having a collar on the outer circumference of the opening of the receiving port and welding the projection, A pipe joint having a separation preventing function can be easily configured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a receiving port 12 is formed at the end of one cast iron pipe 11 to be joined to each other, and a receiving port 12 is provided at the end of the other cast iron pipe 13. Inserted inside 14
Are formed. A sealant accommodating portion 15 is provided on the inner circumference of the receiving port 12.
The sealing material 16 accommodated in the sealing material accommodating portion 15 is formed by inserting the insertion opening 14 into the receiving opening 12.
A predetermined sealing function is imparted by being compressed between the inner surface of 12 and the outer surface of the insertion opening 14. A collar 17 is formed on the outer periphery of the opening of the receiving port 12.

An annular projection 18 having a rectangular cross section is fitted on the outer periphery of the insertion opening 14 outside the receiving opening 12 and fixed by welding. 19 is the weld. The protrusion 18 is configured to be located near the opening end face 20 of the receiving opening 12 when the insertion opening 14 is inserted to a predetermined position inside the receiving opening 12.

A cast iron cup 21 is provided on the outer periphery of the insertion slot 14.
Has been fitted out. The cup 21 has an inner peripheral flange 22 located farther from the receiving opening 12 than the protruding portion 18 welded to the insertion opening 14, and the inner peripheral flange 22 has a protruding portion 18 in the pipe axial direction.
Can be engaged with. In addition, the cup 21 is an inner peripheral flange
The first inner peripheral surface 24 is formed from the position 22 to the portion of the receiving port 12 beyond the flange portion 17, and corresponds to the outer peripheral surface of the protrusion 18 of the insertion port 14 and the end face of the receiving port 12. It has a corresponding surface 25 in the radial direction of the tube and a second inner peripheral surface 26 corresponding to the outer peripheral surface of the flange portion 17 of the receiving port 12. The second inner peripheral surface 26 is formed to have a length reaching the outer peripheral surface 27 of the receptacle 12 at a position beyond the brim portion 17, and an annular groove 28 is formed in a portion corresponding to the outer peripheral surface 27. It has a formed structure.

A lock ring 30 is housed in the annular groove 28. The lock ring 30 has a rectangular cross section and is formed so that it can be split in the circumferential direction. Set bolts 31 screwed in the pipe radial direction from the outer surface of the cup 21 toward the annular groove 28 are arranged at a plurality of positions in the circumferential direction. This set bolt 31 has a lock ring
By pressing the outer surface of 30 to reduce the diameter of the lock ring 30, the lock ring 30 can be tightened to the outer peripheral surface 27 of the receiving port 12. And the lock ring 30
When the outer peripheral surface 27 of the receiving port 12 is thus tightened, it becomes possible to engage with both the annular groove 28 and the flange portion 17 in the pipe axial direction.

Ribs 32 are formed on the cup 21 at circumferential positions corresponding to the set bolts 31. This rib 32
Is when the lock ring 30 is pressed against the outer peripheral surface 27 of the receptacle 12 by the set bolt 31, when the inner peripheral flange 22 engages with the protrusion 18, and the lock ring 30 is attached to the annular groove 28 and the brim portion 17. It functions to prevent the cup 21 from being greatly deformed when engaged with each other.

According to this structure, at the laying site of the pipeline, by inserting the insertion port 14 in which the projection 18 is not welded into the receiving port 12 in which the sealing material 16 is housed in advance, It is possible to construct a telescopic pipe joint.

When such a pipe joint is used as a detachment prevention type, a lock ring is used at a site where pipes are laid.
The cup 21 having the ring groove 28 accommodated therein and the projection 18 are fitted into the insertion opening 14 and then the projection 18 is welded to a predetermined position. Then, insert the insertion opening 14 into the receiving opening 12, and insert the protrusion 18 into the receiving opening 12.
Of the cup 21 corresponding to the open end face 20 of the
Is arranged so as to cover the protrusion 18 and the brim 17. Then, the lock ring 30 that can easily be opened in the annular groove 28 becomes
Since it is located corresponding to the outer peripheral surface 27 of the receiving port 12 beyond the portion, the lock ring 30
The lock ring 30 is tightened to the outer peripheral surface 27 by reducing the diameter of the lock ring 30.

Then, the inner peripheral flange 22 of the cup 21 is inserted.
Since the lock ring 30 engages with both the annular groove 28 of the cup 21 and the flange portion 17 of the receiving opening 12 while engaging with the protrusion 18 of 14, the predetermined separation between the receiving opening 12 and the insertion opening 14 is performed. A preventive function will be added.

In this way, the cup 21 is fitted on the outer periphery of the insertion opening 14 of the ordinary telescopic pipe joint having the flange portion 17 on the outer periphery of the opening of the receptacle 12, and the projection 18 is welded. so,
A pipe joint having a detachment prevention function can be easily configured by construction at a laying site.

FIG. 2 shows another embodiment of the present invention. Here, instead of forming an inner peripheral flange on the cup 21, an annular groove 35 is also formed on the inner periphery of the cup 21 in a portion farther from the receiving port 12 than the protrusion 18, and the annular groove 35 is accommodated in the annular groove 35. By pressing the lock ring 36 that is easy to open with a set bolt 37 to reduce the diameter, the lock ring 36 is configured to be tightened on the outer periphery of the insertion opening 14 at a position where it can engage with the protrusion 18. There is. Even with such a configuration,
The separation preventing function can be easily added to the telescopic pipe joint at the site where the pipeline is laid.

FIG. 3 shows still another embodiment of the present invention. Here, the cup 21 is configured to be bisected in the axial direction, and is configured to be integrated by fastening a pair of annular divided pieces 41 and 42 with bolts and nuts 43. An inner peripheral flange 22 that engages with the protrusion 18 of the insertion opening 14 is formed on one of the split pieces 41, and instead of disposing a lock ring accommodated in the annular groove on the other split piece 42 as well. Further, an inner peripheral flange 44 capable of engaging with the flange portion 17 of the receiving opening 12 is formed.

According to such a configuration, the one divided piece 41
And the projection 18 are externally fitted to the insertion opening 14 in advance and the projection 18 is welded to the insertion opening 14, and the other divided piece 42 is externally fitted to the receiving opening 12 in advance, and in that state Inside the mouth 14
Similarly, by inserting both of the divided pieces 41 and 42 into one piece by the bolts and nuts 43, similarly, it is possible to easily add the separation preventing function to the telescopic pipe joint at the laying site of the pipe line.

[0020]

As described above, according to the present invention, in the pipe joint for compressing the annular seal material between the inner surface of the receiving opening and the outer surface of the receiving opening, it is welded to the outer periphery of the inserting opening outside the receiving opening. Since the lock ring in the annular groove formed in the annular cup that can be engaged with the protruding portion is engaged with the annular groove and the outer peripheral flange portion of the opening of the receiving port by the set bolt, this collar portion By fitting the cup on the outer circumference of the insertion port of a normal telescopic pipe joint that has, and welding the protrusion, it is easy to perform by construction at the laying site,
A pipe joint having a separation preventing function can be configured.

[Brief description of drawings]

FIG. 1 is a sectional view of a separation prevention pipe joint according to an embodiment of the present invention.

FIG. 2 is a sectional view of a separation prevention pipe joint according to another embodiment of the present invention.

FIG. 3 is a sectional view of a separation prevention pipe joint according to still another embodiment of the present invention.

[Explanation of symbols]

 12 Receiving port 14 Inserting port 16 Sealing material 17 Collar part 18 Projection part 19 Welding part 21 Cup 22 Inner peripheral flange 28 Annular groove 30 Lock ring 31 Set bolt

Claims (1)

[Claims] 1. A pipe joint for compressing an annular sealing material between an inner surface of a receiving opening and an outer surface of the receiving opening, wherein an annular projection is welded to the outer periphery of the receiving opening outside the receiving opening to open the opening of the receiving opening. A flange portion is formed on the outer periphery of the portion, and it is fitted to the receiving portion outside the receiving portion rather than the protruding portion in the insertion opening over the receiving portion beyond the flange portion, and can engage with the protruding portion. A ring-shaped cup is provided, and a lock ring which can be opened is housed in an annular groove formed in the inner periphery of the cup corresponding to the receiving portion beyond the flange portion, and the lock ring is screwed into the annular groove from the outer surface of the cup. Thus, the lock ring is reduced in diameter, and a set bolt for engaging the lock ring with the annular groove and the collar portion is provided.