JP3052987B2 - Joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure which is used for joining a deformed pipe and a straight pipe and has a function of preventing detachment.

[0002]

2. Description of the Related Art Conventionally, there has been known a joint structure having an earthquake-resistant function for preventing a final detachment while permitting a certain amount of insertion / removal operation between a receiving port and an insertion port during an earthquake. .

As shown in FIG. 6, when a bent portion 42 exists in a pipe 41, a bent pipe 43 (deformed pipe) is formed by water pressure.
In addition, since a force (average force) P for moving the curved tube 43 acts, the curved tube 43 is moved by the non-average force P with respect to the straight tubes 44a and 44b as shown by the imaginary line in FIG. Easy to bend, pipeline
There was a risk that excessive bending stress would occur in 41 or the pipe line 41 would be greatly shifted. As a method for preventing the bending of the curved tube 43 due to the non-average force P as described above, as shown in FIG.
It is conceivable to fix 43 with protective concrete 45.

[0004]

However, installing the protective concrete 45 as described above is troublesome, and there is a problem that a place for installing the protective concrete 45 must be secured.

An object of the present invention is to solve the above problem and to provide a joint structure that does not require protective concrete and that does not easily bend the joint between a deformed pipe and a straight pipe.

[0006]

In order to solve the above-mentioned problems, the joint structure according to the first aspect of the present invention has a seal material accommodating groove formed on an inner peripheral surface of a receiving port, and the sealing material accommodating groove is formed more than the sealing material receiving groove. A lock ring accommodating groove is formed on the inner peripheral surface on the back side, and a sealing material that is in pressure contact with the outer peripheral surface of the insertion hole inserted into the receptacle and the inner peripheral surface of the receptacle is mounted on the sealing material accommodating groove. A lock ring is attached to the lock ring receiving groove so as to surround the outer periphery of the insertion port. A projection is formed, and a ring-preventing ring body receiving groove is formed on the inner peripheral surface of the receiving port on the opening side of the sealing material receiving groove, and the bending-preventing ring body is attached to the bending-preventing ring body receiving groove. Then, this bending prevention ring body is divided into a plurality of parts in the circumferential direction. And a resilient positioning piece sandwiched between the ends of the adjacent split ring pieces. A plurality of push bolts are provided to press the ring body against the outer peripheral surface of the insertion opening.

Further, the joint structure according to the second aspect of the present invention
The split ring piece is constituted by a metal material layer formed on the inner peripheral side and a soft material layer formed on the outer peripheral side and softer than the metal material layer.

[0008]

According to the structure of the first aspect of the present invention, since the ring for preventing bending is pressed against the outer peripheral surface of the insertion opening by tightening the push bolt, the insertion opening and the receiving opening are fixed to each other in the radial direction. . This makes it difficult for the insertion opening and the receiving opening to bend mutually, and the mutual bending between the insertion opening and the receiving opening is reduced to an allowable amount or less.

Further, when the insertion opening and the receiving opening are slightly bent below the permissible amount due to the non-average force, a bending moment acts on the joint portion. Deforms to absorb this bending moment. Thereby, even if a bending moment acts on the joint portion, it is possible to prevent problems such as deformation of the insertion opening and peeling of the lining portion formed on the inner peripheral surface of the insertion opening.

Further, in the case of mounting the bending preventing ring body, each split ring piece is fitted into the bending preventing ring body housing groove, and the elastic piece is pushed between the ends of the adjacent split ring pieces, whereby each split ring piece is pressed. The piece is reliably positioned and attached to the bending prevention ring body receiving groove without falling off from the bending prevention ring body receiving groove. As described above, the elastic piece enables positioning and mounting of the bending prevention ring body and absorption of the bending moment, which is very effective.

According to the structure of the second aspect of the present invention, when the insertion opening and the receiving opening are slightly bent below the allowable amount due to the non-average force, a bending moment acts on the joint portion. The elastic piece of the preventing ring body is deformed and the soft material layer is deformed to serve as a cushion. For this reason, it is possible to reduce the concentration of the load at the contact portion between the outer peripheral surface of the bending prevention ring body (that is, the outer peripheral surface of the soft material layer) and the tip of the push bolt, and it is possible to absorb the bending moment. Therefore, it is possible to prevent a problem that the opening is deformed or a lining portion formed on the inner peripheral surface of the opening is peeled off.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 5, reference numeral 1 denotes a pipe having a bent portion 12. The pipe 1 includes a plurality of straight pipes 2, 2a and 2b joined to each other, and a bent pipe 3 which is an example of a deformed pipe. Are formed.

A joint structure between the curved pipe 3 and one straight pipe 2a joined to the curved pipe 3 will be described below. That is, as shown in FIG. 2, a receiving port 4 is formed at one end of the curved pipe 3, and an insertion port 5 formed at the other end of one of the straight pipes 2 a is inserted into this receiving port 4. . A sealing material receiving groove 6 is formed on the inner peripheral surface of the receiving port 4, and a rubber ring 7 (pressed between the outer peripheral surface of the insertion port 5 and the inner peripheral surface of the receiving port 4) is formed in the sealing material receiving groove 6. An example of a sealing material) is attached. A lock ring housing groove 8 is formed on the inner peripheral surface on the inner side of the receiving port 4 than the seal material housing groove 6. A lock ring 9 surrounding the outer periphery of the insertion opening 5 is mounted in the lock ring housing groove 8. A ring-shaped rubber for centering is provided between the lock ring 9 and the lock ring accommodation groove 8.
Ten are provided. Further, a protrusion 11 is formed on the outer periphery of the distal end of the insertion port 5 so as to be inserted more deeply into the receiving port 4 than the lock ring 9 and can be engaged with the lock ring 9.

On the inner peripheral surface of the receiving port 4 on the opening side of the sealing material accommodating groove 6, a ring body accommodating groove 14 for preventing bending is formed over the entire circumference. A bending prevention ring body 15 is mounted in the bending prevention ring body housing groove 14.

As shown in FIGS. 1 to 3, the ring member 15 for preventing bending is formed between an arc-shaped divided ring piece 16 divided into three in the circumferential direction and an end of the adjacent divided ring pieces 16. A rubber piece 17 (an example of an elastic piece) for positioning which is elastically deformable and is sandwiched between them is formed in an annular shape. further,
Each of the split ring pieces 16 includes a ductile cast iron material layer 18 (an example of a metal material layer) formed on the inner peripheral side and a nylon material layer 19 (soft material) formed on the outer peripheral side and softer than the ductile cast iron material layer 18. Material layer).

A radial bolt hole 20 having one end communicating with the bottom surface of the bending prevention ring body accommodating groove 14 and the other end communicating with the outer peripheral surface of the receiving port 4 is formed on the opening side of the receiving port 4. It is divided and formed at six places in the direction. In these bolt holes 20, push bolts 21 which are screwed in the radial direction from the outer peripheral surface of the receiving port 4 to abut against the outer peripheral surfaces of the divided ring pieces 16 and press these divided ring pieces 16 against the outer peripheral surface of the insertion opening 5 are provided. A plurality is provided.

As shown in FIG. 4, the joint structure between the curved pipe 3 and the other straight pipe 2b joined to the curved pipe 3 is the same as described above. That is, an insertion port 22 is formed at the other end of the curved pipe 3, and this insertion port 22 is inserted into the receiving port 23 of the other straight pipe 2b. The rubber ring 7, the lock ring 9, the centering rubber 10, the protruding portion 11, the ring member 15 for preventing bending, the push bolt 21 and the like are also provided at the joint between the receiving port 23 and the insertion port 22. Is provided.

The operation of the above configuration will be described below.
A rubber ring 7 is mounted in the sealing material receiving groove 6, a lock ring 9 and a centering rubber 10 are mounted in the lock ring receiving groove 8,
The bending prevention ring body 15 is mounted in the bending prevention ring body housing groove 14. At this time, each split ring piece 16 is fitted into the bending prevention ring body accommodating groove 14, and the rubber piece 17 is pushed between the end portions of the adjacent split ring pieces 16, whereby each split ring piece
16 is securely positioned and attached to the bending prevention ring body housing groove 14 without falling off from the bending prevention ring body housing groove 14. At this time, as shown in FIG. 3, the positions of the rubber pieces 17 are set in the circumferential direction with respect to the positions of the bolt holes 20 of the push bolts 21.

Thereafter, the insertion port 5 is inserted into the reception port 4. At this time, each split ring piece 16 and rubber piece 17
In order to move to the outer circumference in the bending prevention ring body accommodating groove 14 by being pushed to the outside, the bending prevention ring body 15 is expanded in diameter, and the protrusion 11 is formed on the inner circumference of the bending prevention ring body 15. Can pass through. Further, a rubber ring 7 and a lock ring 9
Are pushed by the protrusions 11 to expand the diameter elastically, so that the protrusions 11 can pass through the inner circumferences of the rubber ring 7 and the lock ring 9.

After the insertion port 5 is inserted into the receiving port 4 in this manner, each push bolt 21 is inserted into the bolt hole 20 from the outer peripheral surface side of the receiving port 4.
The split ring pieces 16 are pressed against the outer peripheral surface of the insertion port 5, respectively, so that the insertion port 5 and the receiving port 4 are fixed to each other in the radial direction. Therefore, the ductile cast iron material layer 18 is pressed against the outer peripheral surface of the insertion opening 5,
The insertion port 5 and the receiving port 4 at the joint portion between the curved pipe 3 and one of the straight pipes 2a are hardly bent mutually, and the mutual bending between the inserting port 5 and the receiving port 4 is reduced to an allowable amount or less. .

When the insertion port 5 and the receiving port 4 are slightly bent by the non-average force P below the allowable amount, a bending moment acts on the joint portion. The rubber piece 17 is deformed and the nylon material layer 19 is deformed to serve as a cushion. For this reason, it is possible to reduce the concentration of the load at the contact portion between the outer peripheral surface of the bending prevention ring body 15 (that is, the outer peripheral surface of the nylon material layer 19) and the tip of the push bolt 21, thereby absorbing the bending moment. Can be. Therefore, it is possible to prevent a problem that the insertion port 5 is deformed or a lining portion formed on the inner peripheral surface of the insertion port 5 is peeled off. The rubber piece 17 is very effective because it also absorbs a bending moment in addition to positioning and mounting the bending prevention ring 15. FIG.
As shown in the figure, when the insertion port 5 moves in the disengagement direction A with respect to the reception port 4, the projection 11 engages with the lock ring 9, so that
The insertion opening 5 can be prevented from being detached from the reception opening 4.

Similarly to the above, the insertion port 22 and the reception port 23 at the joint between the curved pipe 3 and the other straight pipe 2b shown in FIG. The bending moment generated by mounting and slight bending can be absorbed.

Therefore, even if the non-average force P acts on the curved tube 3, the curved tube 3 is hardly bent with respect to each of the one straight tube 2a and the other straight tube 2b. It is not necessary to secure the protective concrete 45 (see FIG. 6) which has been conventionally installed for fixing the pipe 3 and its installation place, and the piping work can be saved.

In the above embodiment, as shown in FIG. 4, the straight pipes 2a and 2b are joined to the curved pipe 3, respectively.
Not limited to this, the joint structure of the above embodiment may be applied to other deformed pipes, that is, a junction between a T-shaped pipe or a single-drop pipe and a straight pipe.

In the above embodiment, as shown in FIG. 1, the bending prevention ring body 15 is composed of three divided ring pieces 16 and rubber pieces 17. The number may be increased or decreased according to the size of the pipe diameter. Similarly, as shown in FIG. 3, the number of push bolts 21 is not limited to six, and may be increased or decreased according to the size of the pipe diameter.

In the above embodiment, the ductile cast iron material layer 18 is used as an example of the metal material layer. However, the present invention is not limited to this, and another cast iron material, steel material, or non-ferrous metal may be used.
Further, the nylon material layer 19 (such as nylon 6) is used as an example of the soft material layer, but the invention is not limited thereto, and rubber or plastic may be used.

Further, in the above embodiment, each split ring piece 16 is formed in a two-layer structure of the ductile cast iron material layer 18 and the nylon material layer 19;
Formed in a single-layer structure only with the ductile cast iron material layer 18. According to this, when a bending moment acts on the joint portion due to the non-average force, the bending prevention ring 15
Only the rubber piece 17 is deformed to absorb the bending moment.
As described above, since only the rubber piece 17 absorbs the bending moment, even if the material of each split ring piece 16 is a single metal material, the insertion hole 5 is deformed or formed on the inner peripheral surface of the insertion hole 5. It is possible to prevent such a problem that the lining portion is peeled off.

[0028]

As described above, according to the first aspect of the present invention, the ring for preventing bending is pressed against the outer peripheral surface of the insertion opening by tightening the push bolt. Fixed at. This makes it difficult for the insertion opening and the receiving opening to bend mutually, and the mutual bending between the insertion opening and the receiving opening is reduced to an allowable amount or less. Therefore, by applying such a joint structure to the joint between a deformed pipe and a straight pipe,
It is not necessary to secure protective concrete for fixing the deformed pipe and its installation place as in the conventional case, and the labor for piping work can be saved.

When the insertion opening and the receiving opening are slightly bent below the allowable amount due to the non-average force, a bending moment acts on the joint portion. Deforms and absorbs bending moment. Thereby, even if a bending moment acts on the joint portion, it is possible to prevent problems such as deformation of the insertion opening and peeling of the lining portion formed on the inner peripheral surface of the insertion opening.

Further, when the bending preventing ring is mounted, each divided ring is fitted into the bending preventing ring body accommodating groove, and the elastic piece is pushed between the ends of the adjacent divided ring, thereby forming each divided ring. The piece is reliably positioned and attached to the bending prevention ring body receiving groove without falling off from the bending prevention ring body receiving groove. As described above, the elastic piece enables positioning and mounting of the bending prevention ring body and absorption of the bending moment, which is very effective.

According to the second aspect of the present invention, when the insertion opening and the reception opening mutually bend slightly below the allowable amount due to the non-average force,
A bending moment acts on the joint portion. At this time, the elastic piece of the ring member for preventing bending is deformed and the soft material layer is deformed to serve as a cushion. For this reason, it is possible to reduce the concentration of the load at the contact portion between the outer peripheral surface of the bending prevention ring body (that is, the outer peripheral surface of the soft material layer) and the tip of the push bolt, and absorb the bending moment. Therefore, it is possible to prevent a problem that the opening is deformed or a lining portion formed on the inner peripheral surface of the opening is peeled off.

[Brief description of the drawings]

FIG. 1 is a front view of a bending prevention ring used in a joint structure according to an embodiment of the present invention.

FIG. 2 is a sectional view of a joint structure.

FIG. 3 is a view in which a bending prevention ring body is mounted.

FIG. 4 is a plan view of a bent portion of a pipeline.

FIG. 5 is a plan view of the entire pipeline.

FIG. 6 is a plan view of the entire pipeline in a conventional example.

FIG. 7 is a plan view of a bent portion of a pipe in a conventional example.

[Explanation of symbols]

 4 Receiving port 5 Insertion port 6 Seal material accommodating groove 7 Rubber ring (sealant) 8 Lock ring accommodating groove 9 Lock ring 11 Projection 14 Bending prevention ring body accommodating groove 15 Bending prevention ring body 16 Split ring piece 17 Rubber piece (Elastic piece) 18 Ductile cast iron material layer (metal material layer) 19 Nylon material layer (soft material layer) 21 Push bolt 22 Insertion port 23 Reception port

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 21/08 F16L 21/02

Claims (2)

(57) [Claims] A sealing material accommodating groove is formed on an inner peripheral surface of the receiving port, and a lock ring accommodating groove is formed on an inner peripheral surface on a deeper side of the receiving port than the sealing material accommodating groove; A sealing material that presses against the outer peripheral surface of the insertion hole inserted into the receptacle and the inner peripheral surface of the receptacle is mounted, and a lock ring surrounding the outer periphery of the insertion port is mounted in the lock ring receiving groove. A projection is formed on the outer periphery of the distal end of the insertion port so that the projection can be inserted into the back side of the receiving port than the lock ring and can engage with the lock ring. A ring member housing groove for preventing bending is formed on the peripheral surface, a ring member for preventing bending is attached to the groove body for preventing bending, and the ring member for bending is divided into a plurality of divided ring pieces in the circumferential direction. And a positioning member sandwiched between the ends of the divided ring pieces adjacent to each other. And a plurality of push bolts, which are formed with the elastic pieces of the above, and are provided on the receiving port, for pressing the bending preventing ring body against the outer circumferential surface of the insertion opening by contacting the outer circumferential surface of the bending preventing ring body. Joint structure. 2. The split ring piece comprises a metal material layer formed on the inner peripheral side and a soft material layer formed on the outer peripheral side and softer than the metal material layer. Item 7. The joint structure according to Item 1.