JPS6128553Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe holding piece in a pipe separation prevention device for a pipe line.

Pipe separation prevention devices are used to prevent the bent pipe from separating from the joint at a bend in the pipe, but pipes are mainly buried underground, and If the pipe retaining force for preventing separation is insufficient with the prevention device alone, a concrete block is placed in the bent pipe section. For example, as shown in FIG. 7, in a conduit 54 in which pipes 53 are connected to both ends of a bent pipe 51 via joints 52, the joints 52
A concrete block 55 is placed in the part of the bent pipe 51 including the bent pipe 51.

Under such conditions of use, a tube detachment force acts on the pipe joint 52 due to the water pressure inside the tube or an external force, and the tube holding piece moves to obtain a tube holding force corresponding to the tube detachment force. In the conventional pipe detachment prevention device, it is necessary for the piece to move in order to obtain the pipe holding force, but when the pipe is buried underground as described above, or furthermore when a concrete block is placed. In the case of concrete blocks, earth, sand and concrete get into the surroundings of the pieces, making it difficult to move the pieces, making it impossible to obtain the necessary pipe holding force, and the ability to prevent pipe separation cannot be achieved.

Therefore, the present invention has been devised to provide a piece protection for a tube detachment prevention device that can ensure the mobility of the tube holding piece under any usage conditions and fully demonstrate its ability to prevent tube detachment due to the mobility of the piece. It seeks to provide structure.

In other words, the piece protection structure of the present invention is a pipe holding piece housed in a piece accommodating portion of a pushing ring connected to a pipe socket, and is located outside of the piece in a tube detachment prevention device in which the piece is pressed against a pipe socket. Further, a protective member for preventing dirt and sand intrusion having elastic force in the radial direction of the push ring is elastically interposed between the push ring and the pipe insertion opening.

Next, the first embodiment of the present invention shown in FIGS. 1 to 5 will be explained. The tube detachment prevention device applied to this embodiment has a tube insertion port 3 inserted into a tube socket 1 through a packing 2. In the joint part 4, the push ring 5 fitted into the pipe socket 3 and the pipe socket 1 are linked with the linking bolt 6 and the nut 7, and the rear end of the push ring 5 is pressed against the packing 2, and the front end surface of the push ring 5 is pressed. The protrusions 8 are distributed approximately equally in the circumferential direction.
A push bolt 9 directed toward the center of the press ring 5 is screwed into the protrusion 8, and a tube holding piece 11 is inserted into a piece accommodating portion 10 located at the protrusion 8 and recessed in the inner peripheral surface of the press ring 5.
A hemispherical recess 1 formed on the top surface of the piece 11.
2, a hemispherical tip 1 formed at the tip of the push bolt 9;
3 is pressed, and the teeth 14 formed on the lower surface of the piece 11 are pressed against the tube insertion port 3.

In this example, in this tube detachment prevention device,
A protective member 15 for preventing the intrusion of earth and sand is located on the outside of the piece 11 and is elastically interposed in the gap between the protrusion 8 of the push ring and the pipe insertion port 3. The protective member 15 is shown in FIGS. 4 and 5. As shown, a U-shaped body 18 having a concave portion 17 at the rear end 16 is formed using rubber, plastic, etc., and the inside of the U-shaped body 18 is formed into a hollow portion 19 that is open toward the concave portion 17. The U-shaped body 18 is given elasticity in the thickness direction.
is inserted into the gap between the protrusion 8 and the tube socket 3 as described above, and is held between the protrusion 8 and the tube socket 3 by the elastic action of the U-shaped body 18 having the hollow part 19, and the recess 17
Piece 11 is located inside.

In the structure of this example, when it is buried underground or when concrete blocks are placed around it as explained in Figure 7 above, the surrounding earth and concrete try to invade the area around the piece 11. However, a protective member 15 for preventing dirt and sand from entering the piece storage part 10, which is located on the outside of the piece 11 and is interposed in the gap between the protruding part 8 of the push ring and the pipe insertion port 3, prevents the dirt and concrete from entering the piece storage part 10. Intrusion is prevented, the mobility of the piece 11 is ensured, and malfunction is prevented.

Note that when the tube socket 1 and the tube socket 3 tend to separate relatively, the piece 11 rotates around the tip end 13 of the push bolt toward the moving side of the tube socket 3, and the toothed part 14 rotates. A tendency to bite into the tube insertion port 3 is generated to increase the force for holding the tube against the tube insertion port 3. Further, the protection member 15 for preventing the intrusion of earth and sand may be formed using a thin metal plate as described above, or may not have the hollow portion 19 when using a foamed synthetic resin such as a foamed polystyrene resin. Further, as shown in FIG. 6, the tube holding piece may be a piece 23 whose upper surface is formed into an inclined surface 20 tilting forward and downward, and the inclined surface 20 is pressed by a push bolt 22 via a wedge-shaped piece 21. In this case, by applying the protection member 15 for preventing the intrusion of earth and sand, it is possible to prevent the earth and sand from entering around the piece 23 as in the above example. In this case, the piece 23 moves together with the tube insertion port 3 when a tube detachment force is applied, and the wedge action of the inclined surface 20 increases the tube holding force.

Next, the second embodiment shown in FIGS. 8 to 11 will be described. The tube socket 31, the tube socket 32, the packing 33, the push bolt 34, the piece 35, and the linkage of the tube detachment prevention device applied to this example are explained below. The bolt 36 and the nut 37 are the same as in the first embodiment, but the difference is that the front end inner circumferential portion 41 of the push ring 40 is provided with a protrusion 39 having a piece accommodating portion 38 as in the first embodiment. The tube protrudes forward and is aligned with the front end of the protruding portion 39. In this tube detachment prevention device, as shown in FIG. A member 43 is used, and the protective member 43 is located on the front side of the piece 35 and interposed between the tube insertion port 32 and the inner peripheral portion 41 of the front end of the press ring. As a result, the protective member 43 prevents earth and sand from entering around the piece 35 from the outside, and as in the first embodiment, the piece 3
5 to ensure mobility.

In addition to the above-mentioned protection member 43 having a circular cross section, the ring-shaped protection member may include a ring-shaped protection member 45 having a U-shaped cross section and a hollow portion 44 as shown in FIGS. 12 and 13, or a hollow portion. A ring-shaped protective member 47 having a horizontally U-shaped cross section and having a horizontal U-shaped cross section may be used.
There is no problem even if the protective member does not have 4, 46.

In addition, in each of the above embodiments, the case where the packing is applied to a pipe separation prevention device of a mechanical type pipe joint in which the packing is prevented from coming off with a push ring is shown, but in this case, the pipe separation of a slip-on type pipe joint in which the packing is prevented from coming out with a pipe socket is shown. The same applies to prevention devices as well.

As described above, in the present invention, a protective member for preventing earth and sand intrusion, which is located on the outside of the piece and has elasticity in the radial direction of the push ring, is elastically interposed between the push ring and the pipe insertion port, so that it can be installed underground. Even under usage conditions where the pipe is buried or a concrete block is placed around it, the protective member prevents earth, sand and concrete from entering around the pipe holding piece, ensuring the piece's mobility. The ability to prevent tube separation can be fully demonstrated.

[Brief explanation of the drawing]

FIG. 1 is a front view of the embodiment, FIGS. 2 and 3 are cross-sectional views taken along lines A-A and B-B in FIG. 1, respectively, and FIG. 4 is a turning plane of the protective member. Figure, 5th
The figure is a right side view of FIG. 4, FIG. 6 is a sectional view of another example compared to FIG. 2, FIG. 7 is a schematic plan view for explaining usage conditions, and FIG. Figure 9,
Fig. 10 is a sectional view taken along line C-C and line D-D in Fig. 8, respectively, Fig. 11 is an enlarged sectional view of a portion of the protective member, and Fig. 12 and Fig. 13 are separate from each other. It is an enlarged sectional view of a part of example protection member. 1...Pipe socket, 2...Packing, 3...Pipe insertion, 4...Joint part, 5...Press ring, 6...Bolt,
7...Nut, 8...Protrusion, 9...Push bolt,
DESCRIPTION OF SYMBOLS 10... Piece storage part, 11... Piece, 12... Recessed part, 13... Tip part, 14... Teeth part, 15... Protective member, 16... Rear end, 17... Recessed part, 18...
U-shaped body, 19...Hollow part, 20...Slanted surface, 2
1... Wedge-shaped piece, 22... Push bolt, 23... Piece,
31...Pipe socket, 32...Pipe insertion, 33...Putting, 34...Push bolt, 35...Piece, 36...
... Bolt, 37 ... Nut, 38 ... Piece accommodating part, 39 ... Protrusion part, 40 ... Push ring, 41 ... Front end inner peripheral part, 42 ... Hollow part, 43 ... Protective member,
44...Hollow part, 45...Protection member, 46...Hollow part, 47...Protection member, 51...Bent pipe, 52...
...Joint part, 53...Pipe, 54...Pipe line, 55...
concrete block.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a pipe detachment prevention device in which a pipe holding piece housed in a piece accommodating portion of a pushing ring connected to a pipe socket is pressed against a pipe socket, A piece protection structure for a pipe detachment prevention device, characterized in that a protective member for preventing dirt and sand intrusion having elasticity in the radial direction of the push ring is elastically interposed between the push ring and the pipe insertion opening. 2. A piece protection structure for a pipe detachment prevention device according to claim 1, wherein the protective member for preventing earth and sand intrusion is formed in a U-shape along the outside of the piece. 3. A piece protection structure for a pipe detachment prevention device according to claim 1, wherein the protection member for preventing earth and sand intrusion is formed in a ring shape along the outer periphery of the pipe insertion port.