JPS639828Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an internally joined type detachment prevention pipe joint.

Conventionally, pipe joints installed on soft ground, etc., allow relative movement in the pipe axis direction between the socket and the socket within a certain range, but are designed to reliably prevent the socket and the socket from separating from each other due to further movement. A pipe joint made of aluminum has been proposed. In this case, as shown in FIG. 2, a protrusion 21 is provided on the inner surface of the socket to receive the sealing material that is inserted and crimped between the socket sockets from the back end of the socket, and a protrusion 21 is provided on the socket opening side from the protrusion 21. The protrusion 20 provided on the outer surface of the socket 2 is formed into tapered surfaces 21a and 20a, respectively.
21 are in contact with each other at their respective tapered surfaces 20a and 21a, so they are susceptible to deformation due to slips, and a situation may occur where they are unable to resist compressive force.

The present invention solves these problems and provides a separation-preventing pipe joint that can withstand large compressive forces.One embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is the socket, 2 is the socket,
A tapered surface 3 that widens in the back provided on the inner surface of the socket 1
A rubber annular sealing material 4 is placed between the
is interposed. A back end step surface 5 is formed in the socket 1 at a position opposite to the tapered surface 3, and the back end step surface 5
A pressing device 6 for pressing the sealing material 4 onto the tapered surface 3 is provided between the sealing material 4 and the sealing material 4 . The pressing device 6 includes a plurality of split rings 7 in the circumferential direction that are in contact with the sealing material 4, and push bolts 8 that are screwed at multiple locations in the circumferential direction and that are in contact with the step surface 5 at the back end of the socket, and are unscrewed. The press ring 9 is divided into a plurality of parts in the circumferential direction and presses the split ring 7 toward the tapered surface 3. At an inner surface position adjacent to the tapered surface 3 of the socket 1 on the socket opening side, there is a protrusion 1 on the outer surface of the socket 2 on the socket opening side from this position.
A protrusion that can be engaged with a tapered surface 10a provided on the tip side of the socket is provided. Protrusion 1 of socket 2
An annular groove 12 is provided on the inner surface of the socket 1 on the socket opening side from 0, and a lock ring 13 that can be engaged with the protrusion 10 of the socket 2 is fitted therein.
is constructed in one piece, has a biasing force for diameter reduction, and is fitted onto the outer surface of the socket 2. Furthermore, lock ring 1
A protrusion 14 that can be engaged with the lock ring 13 is provided on the outer surface of the socket 2 on the opposite side from the protrusion 10 with respect to the fitting position of FIG. Also, a tube 1 is formed between the outer peripheral surface of the lock ring 13 and the annular groove 12.
5 is interposed, both ends of which pass through the socket 1 and are pulled out to the outside, and a filling material 16 is injected from one end of the socket by a grout pump or the like.
The tube 15 injected with the filling 16 expands and pushes the lock ring 13, so that the relative movement of the tube of the lock ring 13 causes the protrusion 10 of the socket 2 to
The diameter expanding movement of the lock ring 13 that occurs when the lock ring 13 is engaged with the protrusion 10 or 14 is prevented, and the engagement between the lock ring 13 and the protrusion 10 or 14 is ensured. Therefore, when the socket 2 is pulled out, the lock ring 13 can prevent it from coming off via the protrusion 10, and even when the socket is pushed in due to an earthquake or the like and a large compressive force is generated, the lock ring 13 can counteract it via the protrusion 14. can.

Next, the joint joining work will be explained. First, the tube 15 is fitted into the annular groove 12 of the socket 1, then the lock ring 13 is attached, and the socket 2 is inserted into the socket 1. The lock ring 13 is expanded in diameter by the taper 10a of the protrusion 10 against the biasing force of the diameter reduction, allowing the protrusion 10 to pass through. Insertion ends when the insertion port 2 reaches the specified barrel attachment position. At this time, the lock ring 13 is located between the protrusions 10 and 14 of the socket 2. Next, the sealing material 4 is externally inserted into the socket 2 from between the tip of the socket 2 and the step surface 5 at the far end of the socket 1,
Next, the split ring 7 and the push ring 9 screwed onto the push bolt 8 are inserted and arranged, and the push bolt 8 is unscrewed to apply the sealing material 4 to the tapered surface 3 via the push ring 9 and the split ring 7. Crimp. Finally, filler 16 is injected from one end of tube 15,
The filling tube is brought into contact with the lock ring 13 to prevent the lock ring 13 from expanding its diameter.

Note that a round rubber or steel spring may be used instead of the filling tube 15, and the lock ring may be set by a set bolt inserted from the outer periphery of the socket 1 into the annular groove 12.

As described above, according to the present invention, since the protrusions of the socket are provided in two places with the locking ring in between, it is possible to reliably prevent the socket from coming off when the socket is pulled out, and it is also possible to prevent the socket from being pushed in due to an earthquake or the like, resulting in a large compressive force. It has the advantage of being able to counteract with a locking ring even when it is activated.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view showing a conventional example. 1...Socket, 2...Socket, 10...Protrusion, 12
... annular groove, 13 ... lock ring, 14 ... protrusion.

Claims (1)

[Scope of utility model registration request] A split lock ring is provided in an annular groove provided on the inner surface of the receptacle, and the lock ring is fitted with a reduced diameter on the outer surface of the receptacle, and a protrusion that can be engaged with the lock ring is placed closer to the tip of the receptacle than the lock ring and at the tip of the receptacle. An internal joint type detachment prevention device, characterized in that the lock ring is provided on the outer surface of the socket on the opposite side, and when the socket is pulled out or pushed in, the lock ring engages with each protrusion to prevent the socket from being removed or compressed. pipe fittings.