JPS6361555B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining an internally installed pipe joint.

Internal installation type pipe fittings do not require joining work from the outer circumference of the pipe, so they can be installed in narrow cut-and-cut trenches, using push-in construction methods, or in pipe installations where new pipes are inserted into old pipes for replacement.・Applied to pipe construction methods, etc. However, with conventional internally installed pipe fittings, after inserting the socket into the socket, a person must enter the pipe to carry out the necessary work, which is extremely difficult when the pipe diameter is small. However, this is not possible at all, and there is a limit to the caliber that can be applied.

In view of the above circumstances, an object of the present invention is to provide a joining method that allows application of an internally installed pipe joint even when the pipe diameter is small.

In order to achieve the above object, the present invention has a sealing material seating surface on the inner surface of the socket, and a plurality of circumferential divisions arranged to face the sealing material seating surface from the inside in the radial direction. After inserting a sealing material between the temporary holding ring, the sealing material is pressed by a pressing device interposed between the sealing material and the step surface at the back end of the socket, and the sealing material is compressed. , insert the socket into the socket, move the temporary retaining ring at the tip of the socket to the back of the socket,
It is constructed by removing the temporary retaining ring after it comes off from the sealing material.

With the above configuration, the sealing material is attached to the inside of the sealing material seating surface.Next, after fitting the temporary retaining ring inside this sealing material, the sealing material is pressed by the pressing device to the sealing material seating surface. and the temporary retaining ring. At this time, the sealing material receives deformation stress and tends to protrude inward in the radial direction, but is received by the temporary retaining ring, deformation is prevented, and a predetermined sealing pressure is generated. In this way, when the socket is inserted into the socket while the sealing material is compressed, the tip of the socket will be attached to one part of the temporary retaining ring.
Touch and press the side to move the temporary retaining ring toward the back of the socket. Then, the temporary retaining ring comes off from the sealing material and the outer surface of the socket is fitted inside the sealing material, and the temporary retaining ring that is subsequently moved is released radially inward from between the socket tip and the pressing device. removed externally.

An embodiment of the present invention will be described below based on the drawings. In FIG. 1, reference numeral 1 denotes a socket, and an inner surface thereof is provided with a stepped surface 2 facing toward the rear, and a sealing material seating surface 3 is formed continuously on the outer periphery of the stepped surface facing toward the rear. An engaging protrusion 4 is provided in a protruding manner on the sealing material seat surface 3 . The back side of the sealing material seating surface 3 is formed into a cylindrical inner surface 6 having the same diameter as the sealing material seating surface 3 until it reaches the step surface 5 at the back end of the socket. Further, an annular groove 7 for fitting a lock ring is formed on the inner surface of the socket 1 at a position closer to the opening than the step surface 2 facing toward the rear. On the other hand, as shown in FIG. 2, the outer surface of the socket 8 inserted into the socket 1 has a width at a position facing the annular groove 7 when its tip faces the radially inner side of the sealing material seat surface 3. A wide and shallow annular lock ring engagement groove 9 is provided, and a tapered surface 10 is formed on the outer periphery of the tip of the socket. When joining the socket 1 and the socket 8 having such a configuration, first place a rubber annular sealing material 1 inside the sealing material seating surface 3.
Attach 1. The outer diameter of this sealing material 11 is formed to be slightly larger than the diameter of the sealing material seat surface 3, and an annular recess 12 that engages with the engagement protrusion 4 is formed on the outer peripheral surface of the sealing material 11. 8. It is designed to prevent it from being dragged and moved when inserted. Next, a temporary retaining ring 13 which is divided into a plurality of parts in the circumferential direction and has the same outer diameter as the socket 8 is fitted inside the sealing material 11, and then the sealing material 11 is connected to the sealing material and the inner end of the socket. A pressing device 14 interposed between the step surface 5 and the step surface 5 presses the step surface 2 facing toward the back. In the illustrated example, this pressing device 14 includes a split ring 15, a push ring 16, a push bolt 17 screwed onto a plurality of places in the circumferential direction of the push ring 16, and a head part of the push bolt 17 that engages with the step surface 5 at the rear end. The split ring 15 and the push ring are formed into a plurality of sections in the circumferential direction, and the reaction force plate 18 is formed into one or a plurality of sections in the circumferential direction. Thus, split ring 15,
The sealing material 1 is removed by unscrewing the backing bolt 17 with the push ring 16 and reaction plate 18 in place.
Compress 1. At this time, the sealing material 11 receives deformation stress and tends to protrude inward in the radial direction, but is received by the temporary holding ring 13, preventing deformation and generating a predetermined sealing pressure. Next, after fitting the lock ring 19 into the annular groove 7 at one location in the circumferential direction, the insertion port 8 is inserted into the socket 1 as shown in FIG. lock ring 19
has a biasing force for diameter reduction, and as the socket 8 is inserted, the diameter is expanded at the tapered surface 10 and fits into the outer surface of the socket, and the tip of the socket 8 comes into contact with one side of the temporary holding ring 13. leading to. When the insertion port 8 is further inserted, the temporary retaining ring 1
3 is pressed by the socket 8 and moves to the back side of the socket 1, and as shown in FIG. The lock ring 19 is fitted into the lock ring engagement groove 9 by its diameter reducing force. Next, the temporary holding ring 13, which has been moved to the back side of the socket until it comes into contact with the press ring 16, is attached to the divided piece in advance and passed through the pipe body p on the socket 8 side, as shown in FIG. By pulling the extended string 20, it is removed radially inward from between the tip of the insertion port 8 and the press ring 16 as shown by the arrow in FIG. 3, and is removed to the outside by pulling the string 20 together. With the above steps, the connection between the socket 1 and the socket 8 is completed, and the sealing material 11 interposed in a compressed state between the sealing material bearing surface 3 of the socket 1 and the outer surface of the socket 8 The receptacle 1 and the receptacle 8 are movable relative to each other in the tube axis direction within the range where a complete seal between the two is obtained and both side surfaces of the lock ring 19 engage with both side walls of the wide lock ring engagement groove 9. be.

In the above embodiment, the lock ring 19 is fitted into the lock ring engagement groove 19 by its diameter reducing force, but there is a hardenable fluid between the bottom surface of the annular groove 7 and the outer periphery of the split lock ring 19. A tube that expands by injecting water can be inserted, or an elastic body can be inserted, and in some cases, a bolt can be provided that penetrates from the outer periphery of the socket 1 into the annular groove 7. good.

In addition, the engagement protrusion 4 of the sealing material seat surface 3 and the sealing material 1
The structure for engaging with the first annular recess 12 does not necessarily have to be provided.

According to the joining method of the internally installed pipe joint of the present invention, before insertion of the socket, a temporary holding ring is used from the opening end of the socket to set the sealing material in the same compressed state as when joining. After that, a complete bonded state can be obtained simply by inserting the insertion port, and the bonding is completed by appropriately removing the temporary retaining ring. Therefore, the inner joint type pipe joint can be joined with a simple operation without requiring anyone to enter the pipe.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view showing the set state of the receptacle before insertion, and FIG.
The figure is a vertical cross-sectional view showing the state in the middle of insertion of the socket, FIG. 3 is a vertical cross-sectional view showing the state when insertion of the socket is completed, and FIG. 4 is an explanatory view of temporary retaining ring removal. DESCRIPTION OF SYMBOLS 1... Socket, 2... Reward stepped surface, 3... Seal material bearing surface, 4... Engaging protrusion, 5... Socket back end stepped surface, 6... Cylindrical inner surface, 7... Annular groove, 8... Socket, 9... Lock ring engagement groove, 11... Seal material, 12... Annular recess, 13
...temporary holding ring, 14...pressing device, 19...lock ring.

Claims (1)

[Claims] 1. A sealing material is inserted between the inner sealing material seating surface of the socket and a temporary holding ring having the same outer diameter as the socket, which is divided into multiple parts in the circumferential direction and is arranged to face the sealing material seating surface from the inside in the radial direction. After the sealing material is inserted into the socket, the sealing material is pressed by a pressing device interposed between the sealing material and the step surface at the back end of the socket, and with the sealing material compressed, the socket is inserted into the socket. A method for joining an internally installed pipe joint, characterized in that the temporary retaining ring is moved to the back of the socket at the tip of the mouth, and is removed after the temporary retaining ring is detached from the sheet material.