JP2001173852A - Aseismatic tube fitting having marring preventive function of spigot projected part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify tube connection by preventing damaging of a spigot projected part by a lock ring at the time of connecting tubes and without recovering a jig to prevent damaging after construction. SOLUTION: This aseismatic tube fitting is constituted by covering a lock ring 13 installed on an inner surface of a socket 11 of the aseismatic tube fitting with a taper cylindrical body 2 to uniformly cover the inner surface reaching a lock ring inner surface 13c from a socket opening side surface 13a and a spigot projected part 1a of a spigot 1 makes contact with the lock ring 13 through the taper cylindrical body 2 and passes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic pipe joint having a function of preventing an insertion projection from being damaged.

[0002]

2. Description of the Related Art A seismic pipe joint as shown in FIG. 9 is known as a pipe joint of a metal pipe such as a ductile cast iron pipe.
The seismic pipe joint 10 has a seal rubber ring storage groove 11a and a lock ring storage groove 11b formed on the inner surface of the receiving port 11, and the seal rubber ring 12 is formed in the seal rubber ring storage groove 11a as shown in the drawing. After mounting the centering rubber 14 and the lock ring 13 in the lock ring storage groove 11b, insert the insertion port 1 having the insertion projection 1a at the tip beyond the lock ring 13 and remove it from the joint section 10. When the power is working,
The insertion projection 1a and the lock ring 13 are engaged with each other to prevent escape.

[0003]

When the above seismic pipe joint 10 is joined, as shown in FIG. 10, the insertion projection 1a pushes the lock ring 13 by the tapered portion 1b and spreads the lock ring 13 toward the back of the receptacle 11. Lock ring 13
, There is a problem that the anticorrosion coating on the outer surface of the tapered portion 1b is damaged and the insertion projection 1a is inconvenient in terms of anticorrosion.

In order to solve such a problem, the receiving port 11
In the case of inserting the insertion port 1, as shown in FIG. 11, a slippery flexible insertion member 15 such as a polyethylene sheet or a thin metal spring is disposed at the opening of the insertion port 1, and the insertion member 15 is inserted together with the insertion member. 1 is inserted into the socket 11 (FIGS. 9 and 10), the insertion projection 1a is wrapped by the insertion member 15, and the lock ring 13 is inserted.
In some cases, it is possible to prevent the insertion projection 1a from being damaged by passing through the portion, and then to pull and collect the pulled-out cord 16 that has been previously tied.

However, in this case, there is a problem that the work of pulling out the insertion member 15 becomes necessary after the work of connecting the pipes, and the number of work steps increases. The present invention solves the above problems, prevents damage to the insertion projection by a lock ring at the time of pipe connection, and simplifies pipe connection without having to collect a jig for preventing damage after construction. Was made as an issue.

[0006]

In order to achieve the above object, an invention according to claim 1 is to provide a lock ring attached to an inner surface of a receiving port of an earthquake-resistant pipe joint by uniformly forming an inner surface from a side face of the receiving port opening to the inner surface of the lock ring. Is formed so that when the pipe is connected, the insertion projection of the insertion comes into contact with the lock ring via the tapered cylindrical body.

Therefore, according to the present invention, the inner surface of the lock ring which comes into contact with the insertion projection when the insertion is inserted is covered with the tapered cylindrical body, which serves as a protective cover to protect the surface of the insertion projection from damage. You.

[0008]

Next, an embodiment of the present invention will be described. FIG. 1 is an explanatory perspective view of a lock ring cover according to the present invention, FIG. 2 is a sectional view of an earthquake-resistant pipe joint having a function of preventing an insertion projection from being damaged, and FIG. FIG.

In FIG. 1, reference numeral 2 denotes a lock ring cover, and as shown in FIG. 2, a side surface 2a of the lock ring 13 along the receiving opening side 13a passes through an inclined surface 2b along the inclined surface 13b of the lock ring 13. Lock ring inner surface 13
The inner surface 2c is formed into a tapered cylindrical shape along the inner surface 2c, and the entire surface is divided into one as shown in FIG.

The side wall 2a of the lock ring cover 2 on the side of the receiving opening is thickened in the axial direction T so that the side surface 2a is not deformed or twisted at the split portion due to friction at the time of insertion of the insertion opening. It is reinforced by. The thickness T for this reinforcement is, for example, about 5 mm in the case of a lock ring having a diameter of φ100 cm.

The inner surface portion 13c of the lock ring 13
The thickness t (FIG. 1) of the cylindrical portion 2c extending along
５００500 μm. The reason for this is that if it is thinner than 200 μm, the cylindrical portion 2 c is too thin and may be broken when the insertion projection 1 a is inserted. Because the amount of engagement with the insertion projection 1a is not sufficient, and the detachment prevention function is impaired.

The whole lock ring cover 2 is integrally formed of a slippery resin such as a polyethylene resin. Next, the connection state of the seismic pipe joint having the function of preventing the insertion projection from being damaged will be described. As shown in FIG. 3, after the centering rubber 14 is mounted on the lock ring storage groove 11b on the inner surface of the receiving port 10, the lock ring 13 fitted with the lock ring cover 2 is mounted.

Next, as shown in FIG. 4, the insertion opening 1 is inserted. At this time, the surface of the insertion projection 1a comes into contact with the lock ring 13 via the tapered portion 2b and the inner surface 2c of the lock ring cover 2. . Therefore, the outer surface of the insertion protrusion 1a is prevented from being damaged by the lock ring 13, and after the insertion 1 is inserted as shown in FIG.
Damage to the corrosion-resistant layer due to contact with 3 can be reliably prevented.

At this time, a strong frictional force is applied to the lock ring cover 2 to pull the lock ring cover 2 deeper into the pipe receiving port. No twisting or twisting. The lock ring cover 2 is placed on the inner surface of the receptacle 11 while being fitted to the outer surface of the lock ring 13 even after the insertion port 1 is connected.
Since the thickness of the inner surface portion 2c is thin, there is no adverse effect on the function of preventing the joint from being pulled out.

Therefore, according to the lock ring cover of this embodiment, the insertion port 1 can be inserted into the receiving port 11 without damaging the surface of the insertion projection 1a. Even if 2 is left unattended, there is no adverse effect on the detachment prevention function of the pipe joint, so that it is not necessary to remove it at the time of connection work, and the pipe connection work is quickly completed.

In the above-described embodiment, the case where the entire lock ring cover 2 is integrally molded with a plastic such as polyethylene resin has been described. However, as shown in FIGS. The ring-shaped metal reinforcing body 3 may be embedded in the thick part of the metal. FIG.
(A) shows the case where the metal reinforcement 3 has a tapered portion embedded up to the inclined portion 2b, and (b) shows the case where the ring-shaped metal reinforcement 3 is embedded only in the side surface 2a.

In this case, since the strength of the side surface 2a on the opening end side is considerably improved, the thickness of this portion can be reduced. Further, the centering rubber 14 arranged on the outer periphery of the lock ring 13 has a configuration in which a number of radially extending contacts 14b are protruded from the inner surface of the ring body 14a. 7. As shown in FIG. 8, an engaging claw 2d extending between the contacts 14b is formed, and the engaging claw 2d is hooked on the outer peripheral edge of the lock ring 13 so that the engaging force is more reliably increased. It is good also as a structure which performs.

A seismic pipe joint having a structure in which the lock ring is designed to prevent the lock ring from coming off, and in which the lock ring is pushed out and inserted when the insertion port is inserted, is a pipe as shown in the above embodiment. Not only joints but also other types can be similarly implemented. Embodiment Next, an embodiment of the lock ring cover will be described.

For a lock ring having a diameter of φ100 mm, five types of polyethylene lock ring covers having a thickness T of the side surface 2 a of 5 mm and a thickness t of the inner surface portion 2 c along the inner surface 13 c of the lock ring of 200 to 500 μm are formed. did.
Next, as shown in FIG. 3, after the centering rubber 14 is attached to the lock ring storage groove 11b on the inner surface of the receptacle 10, the lock ring 13 fitted with the lock ring cover 2 is attached.
Insert 1 was inserted into receptacle 10 and connected.

On the other hand, as a comparative example, a polyethylene lock ring cover having an inner surface portion 2c with a thickness of 150 μm along the inner surface 13c of the lock ring was attached to the lock ring in the same manner, and a pipe joint was connected. As a result, in all of the examples, the connection could be made without damaging the anticorrosion coating film of the insertion projection, but in the case of the comparative example, the cylindrical portion was broken, or into the receptacle together with the insertion projection. I was dragged in.

[0021]

As described above, according to the lock ring cover of the present invention, it is possible to connect the insertion port without damaging the surface of the insertion projection, and leave the lock ring cover after connection. Even so, there is no adverse effect on the detachment prevention function of the pipe joint, so there is no need to remove it during connection work,
Therefore, the work of pulling out the intervening member, which is conventionally required, is not required at all, and the pipe laying work is simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lock ring cover applied to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an earthquake-resistant pipe joint having a function of preventing an insertion projection from being damaged according to an embodiment.

FIG. 3 is a cross-sectional view showing a connection state of an earthquake-resistant pipe joint having a function of preventing an insertion projection from being damaged according to an embodiment.

FIG. 4 is a cross-sectional view showing a connection state of an earthquake-resistant pipe joint having a function of preventing an insertion projection from being damaged according to an embodiment.

FIG. 5 is a cross-sectional view showing a connection state of the earthquake-resistant pipe joint having the function of preventing the insertion projection from being damaged according to the embodiment.

FIG. 6 is a cross-sectional view showing another configuration example of the lock ring cover, in which (a) is a diagram in which a wide reinforcing ring is embedded,
(B) shows a single ring body embedded.

FIG. 7 is a half sectional view showing still another configuration example of the lock ring cover.

FIG. 8 is a sectional view showing a use state of the lock ring cover shown in FIG. 7;

FIG. 9 is a sectional view of a conventional earthquake-resistant pipe joint.

FIG. 10 is an explanatory sectional view showing a joint state of a conventional earthquake-resistant pipe joint.

FIG. 11 is an explanatory sectional view showing a conventional means for joining seismic pipe joints.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert 1a Insert projection 2 Lock ring cover 2a Side surface on the opening side of receiving port 2b Tapered part 2c Tubular part 10 Receiving port 13 Lock ring

Claims (1)

[Claims] A lock ring attached to an inner surface of a receiving port of an earthquake-resistant pipe joint is covered with a tapered tubular body that uniformly covers an inner surface from a side face of the receiving port opening to an inner surface of the lock ring. A seismic pipe joint having a function of preventing the insertion protrusion from being damaged, wherein the insertion protrusion contacts and passes through the lock ring via the tapered tubular body.