JP2018112268A - Expansion joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably adjust deviation in an axial direction and in an eccentric direction occurring in an existing pipe.SOLUTION: A telescopic pipe joint structure 1A includes a first pipe 1, a second pipe 2, a first bending universal joint 10, and a second bending universal joint 20. The first bending universal joint 10 and the second bending universal joint 20 have the same structure, and out of these, the first bending universal joint 10 has a first sleeve 1, a second sleeve 12 and a gimbal mechanism 10A. The gimbal mechanism 10A has a gimbal ring 13, a first cylindrical hinge 15 and a second cylindrical hinge 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an expansion pipe joint structure that is installed at a joint portion of an existing pipe and has a first pipe and a second pipe, and an expandable joint that connects the first pipe and the second pipe in an expandable manner. The present invention relates to an expansion joint structure that can reliably adjust the displacement in the axial direction and the displacement in the eccentric direction of a tube.

  2. Description of the Related Art Conventionally, there has been known an expansion pipe joint structure including a first pipe, a second pipe, and an expandable joint that connects the first pipe and the second pipe in an expandable manner.

  Such an expansion pipe joint structure is installed at a joint portion of an existing pipe where various fluids are transported such as to discharge waste water.

  By the way, existing pipes that carry various fluids may be displaced due to secular changes due to vibrations or earthquakes. In this case, the deviation generated in the existing pipe is caused as expansion / contraction in the axial direction or eccentricity perpendicular to the axial direction.

JP-A-3-285137 JP 2005-91215 A JP 2004-53317 A JP 2004-10355 A

  The present invention has been made in consideration of such points, and an object of the present invention is to provide an expansion joint structure capable of reliably adjusting the deviation in the axial direction and the eccentric direction generated in an existing pipe.

  The present invention provides a first pipe, a second pipe connected to the first pipe via an expandable joint, and a first bend provided at an end of the first pipe opposite to the second pipe. A universal joint, and a second bendable joint provided at an end of the second pipe opposite to the first pipe. The first bendable universal joint and the second bendable universal joint are each first A sleeve and a second sleeve which is joined to the first sleeve via a gimbal mechanism and can be bent at an arbitrary angle of 360 °. The gimbal mechanism includes the first sleeve and the second sleeve. And a gimbal ring surrounding the joint from the outside in the radial direction, a first hinge connecting the first sleeve and the gimbal ring, and connecting the second sleeve and the gimbal ring. A second hinge to A telescopic pipe joint structure characterized in that it has.

  The present invention provides a seal sleeve that surrounds a joint portion of the first sleeve and the second sleeve from the outside in the radial direction inside the gimbal ring, the seal sleeve inner surface, and the first sleeve outer surface, And a rubber seal ring interposed between the inner surface of the sealing sleeve and the inner surface of the seal sleeve and the outer surface of the second sleeve.

  The present invention provides the expansion pipe joint structure, wherein the first sleeve is positioned axially inward with respect to the second sleeve, and the first pipe or the second pipe functions as the first sleeve. is there.

  According to the present invention, a pair of positioning rubber rings for positioning the seal sleeve in the axial direction are provided between the pair of outer surfaces in the axial direction of the seal sleeve and the first hinge and the second hinge. This is a feature of an expansion pipe joint structure.

  As described above, according to the present invention, it is possible to reliably adjust the deviation in the axial direction and the eccentric direction that occur in the existing pipe due to the influence of vibration or earthquake.

FIG. 1 is a side sectional view showing an expansion joint structure according to the present invention. FIG. 2 is a cross-sectional view showing the operation of the expansion joint structure. FIG. 3 is a cross-sectional view showing the operation of the expansion joint structure. FIG. 4 is a cross-sectional view showing the operation of the expansion joint structure. FIG. 5 is a cross-sectional view showing the operation of the expansion joint structure. FIG. 6 is an enlarged view of the expansion joint structure shown in FIG. FIG. 7 is an enlarged view showing a reference state of the expansion joint structure. FIG. 8 is an enlarged view of the expansion joint structure shown in FIG. 7 as viewed from a position rotated 90 °. FIG. 9 is a front view showing an expansion joint structure. FIG. 10 is an enlarged perspective view showing the first bendable universal joint. FIG. 11 is an enlarged view showing an eccentric state of the first bendable universal joint. FIG. 12 is an enlarged view of the first bend universal joint shown in FIG. 11 as viewed from a position rotated by 90 °.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an expansion pipe joint structure according to the present invention will be described with reference to the drawings.

  1 is a side sectional view showing the expansion joint structure according to the present invention, FIG. 6 is an enlarged view showing the expansion joint structure shown in FIG. 1, and FIGS. 7 to 12 are first bent universal joints of the expansion joint structure. FIG.

  As shown in FIGS. 1, 6 to 12, the expansion joint structure 1 </ b> A according to the present embodiment includes a first pipe 1 and a second pipe connected to the first pipe 1 via an expandable joint 4. 2 are provided.

  Among these, as shown in FIG. 6, the expandable joint 4 includes a receiving portion 5 attached to the tip of the first pipe 1, and an expandable rubber ring 7 that is housed in the receiving portion 5 and contacts the outer surface of the second pipe 2. And a push ring 6 that presses the elastic rubber ring 7 in the receiving portion 5 toward the first pipe 1 side.

  The push ring 6 is attached to the receiving portion 5 with a tightening bolt 6a, and the elastic rubber ring 7 is pressed to the outside of the second pipe 2 by the push ring 6 by tightening the tightening bolt 6a.

  The stretchable rubber ring 7 has a pair of rubber rings 7a and 7b, and the rubber rings 7a and 7b are in contact with each other through inclined surfaces formed therebetween. Then, by tightening the tightening bolt 6a, the push ring 6 and the pair of rubber rings 7a and 7b are pressed in the axial direction, whereby each rubber ring 7a and 7b is directed radially inward and radially outward by the inclined surface. To move.

  In this way, the sealability between the first pipe 1 and the second pipe 2 can be maintained by moving the pair of rubber rings 7a and 7b in the radial direction.

  A holding body 8 that holds the anti-bending rubber ring 9 is provided at the tip of the second pipe 2, and the anti-bending rubber ring 9 is in contact with the inner surface of the first pipe 1.

  A first bendable joint 10 is provided at the end of the first pipe 1 opposite to the second pipe 2, and a second bendable universal joint 20 is provided at the end of the second pipe 2 opposite to the first pipe 1. Is provided.

  Of these, the first bendable universal joint 10 and the second bendable universal joint 20 have substantially the same configuration.

  Next, the first bendable universal joint 10 and the second bendable universal joint 20 will be described in detail with reference to FIGS.

  That is, the first bendable universal joint 10 is joined to the first pipe 1 functioning as the first sleeve and the first pipe 1 via the gimbal mechanism 10A and can be bent to any angle of 360 °. 2 sleeves 12. A mounting flange 12 a is attached to the second sleeve 12.

  Among these, the gimbal mechanism 10A is provided at a joint portion 10B between the first pipe 1 and the second sleeve 12, and has a cylindrical shape surrounding the joint portion 10B between the first pipe 1 and the second sleeve 12 from the outside in the radial direction. The gimbal ring 13 includes a first hinge 15 that connects the first pipe 1 and the gimbal ring 13, and a second hinge 16 that connects the second sleeve 12 and the gimbal ring 13. In this case, a space is formed between the first pipe 1 and the second sleeve 12 and the gimbal ring 13.

  A seal sleeve 17 is provided on the radially inner side of the gimbal ring 13 to surround the joint portion 10B of the first pipe 1 and the second sleeve 12 from the radially outer side. The inner surface of the seal sleeve 17 and the outer surface of the first pipe 1 are provided. Sealing rubber rings 18 and 18 are interposed between the sealing sleeve 17 and the inner surface of the sealing sleeve 17 and the outer surface of the second sleeve 12, respectively.

  As described above, the first pipe 1 functions as the first sleeve. However, the present invention is not limited to this, and a first sleeve separate from the first pipe 1 is provided at the left end of the first pipe 1 in FIG. And the first sleeve and the second sleeve 12 may be joined via the gimbal mechanism 10A.

  Next, the first hinge 15 and the second hinge 16 will be described. As shown in FIGS. 1 and 7 to 12, the first hinge 15 includes an end plate 15a fixed to the first pipe 1 by welding, and a cylindrical connecting portion 15b extending from the end plate 15a to the second hinge 16 side. The connecting portion 15b is attached to the end plate 15a by mounting bolts 15d (see FIGS. 7 to 12).

  Further, the connecting portion 15b is rotatably connected to the gimbal ring 13 via a connecting pin 15c.

  The second hinge 16 has an end plate 16a fixed to the second sleeve 12 by welding, and a cylindrical connecting portion 16b extending from the end plate 16a toward the first hinge 15, and the connecting portion 16b is the end plate 16a. Are attached by mounting bolts 16d.

  Further, the connecting portion 16b is rotatably connected to the gimbal ring 13 via a connecting pin 16c.

  With the gimbal mechanism 10A having such a structure, the first pipe 1 and the second sleeve 12 are joined to each other, and the second sleeve 12 can be bent at an arbitrary angle of 360 ° with respect to the first pipe 1. It has become.

  A pair of positioning rings 19, 19 are interposed between the pair of outer surfaces 17 a, 17 a in the axial direction of the seal sleeve 17 and the end plate 15 a of the first hinge 15 and the end plate 16 a of the second hinge 16. . The pair of positioning rings 19 and 19 are used to position the seal sleeve 17 in the axial direction.

  That is, the seal sleeve 17 is disposed radially inward of the gimbal ring 13, and without the positioning rings 19, 19, the seal sleeve 17 moves in the axial direction on the radial inward of the gimbal ring 13. It is also conceivable that the joint 10B between the first pipe 1 and the second sleeve 12 will come off.

  On the other hand, according to the present embodiment, a pair of positioning rings 19 are provided between the outer surfaces 17a and 17a of the seal sleeve 17 and the end plate 15a of the first hinge 15 and the end plate 16a of the second hinge 16. , 19 can be used to position the seal sleeve 17 in the axial direction, and the seal sleeve 17 reliably surrounds the joint portion 10B between the first pipe 1 and the second sleeve 12 from the outside in the radial direction. be able to.

  The second bendable universal joint 20 is a second pipe 2 that functions as a first sleeve, and a second pipe 2 that is joined to the second pipe 2 via a gimbal mechanism 20A and can be bent at an arbitrary angle of 360 °. And a sleeve 22. An attachment flange 22 a is attached to the second sleeve 22.

  Among these, the gimbal mechanism 20A is provided at a joint 20B between the second pipe 2 and the second sleeve 22, and has a cylindrical shape surrounding the joint 20B between the second pipe 2 and the second sleeve 22 from the outside in the radial direction. The gimbal ring 23 includes a first hinge 25 that connects the second pipe 2 and the gimbal ring 23, and a second hinge 26 that connects the second sleeve 22 and the gimbal ring 23. In this case, a space is formed between the second pipe 2 and the second sleeve 22 and the gimbal ring 23.

  In addition, a seal sleeve 27 surrounding the joint portion 20B of the second pipe 2 and the second sleeve 22 from the outer side in the radial direction is provided inside the gimbal ring 23 in the radial direction, and the inner surface of the seal sleeve 27 and the outer surface of the second pipe 2 Sealing rubber rings 28 and 28 are interposed between the inner surface of the sealing sleeve 27 and the inner surface of the sealing sleeve 27 and the outer surface of the second sleeve 22, respectively.

  As described above, the second pipe 2 functions as the first sleeve. However, the present invention is not limited to this, and the first sleeve separate from the second pipe 2 is provided at the right end of the second pipe 2 in FIG. And the first sleeve and the second sleeve 22 may be joined via the gimbal mechanism 20A.

  Next, the first hinge 25 and the second hinge 26 will be further described. The first hinge 25 has an end plate 25a fixed to the second pipe 2 by welding, and a cylindrical connecting portion 25b extending from the end plate 25a toward the second hinge 26. The connecting portion 25b is connected to the end plate 25a. It is attached with a mounting bolt 25d.

  Further, the connecting portion 25b is rotatably connected to the gimbal ring 23 via a connecting pin 25c.

  The second hinge 26 has an end plate 26a fixed to the second sleeve 22 by welding, and a cylindrical connecting portion 26b extending from the end plate 26a toward the first hinge 25. The connecting portion 26b is the end plate 26a. Are attached by mounting bolts 26d.

  Further, the connecting portion 26b is rotatably connected to the gimbal ring 23 via a connecting pin 26c.

  By the gimbal mechanism 20A having such a structure, the second pipe 2 and the second sleeve 22 are joined to each other, and the second sleeve 22 can be bent at an arbitrary angle of 360 ° with respect to the second pipe 2. It has become.

  A pair of positioning rings 29 and 29 are interposed between the pair of outer surfaces in the axial direction of the seal sleeve 27 and the end plate 25 a of the first hinge 25 and the end plate 26 a of the second hinge 26. The pair of positioning rings 29 and 29 are used to position the seal sleeve 27 in the axial direction.

  That is, the seal sleeve 27 is disposed radially inward of the gimbal ring 23, and without the positioning rings 29, 29, the seal sleeve 27 moves in the axial direction inside the gimbal ring 23 in the radial direction. It is also conceivable that the joint 20B between the second pipe 2 and the second sleeve 22 is detached.

  On the other hand, according to the present embodiment, a pair of positioning rings 29, 29 are provided between the outer surface of the seal sleeve 27 and the end plate 25a of the first hinge 25 and the end plate 26a of the second hinge 26. By providing, the sealing sleeve 27 can be positioned in the axial direction, and the joint 20B between the second pipe 2 and the second sleeve 22 can be reliably surrounded from the outside in the radial direction by the sealing sleeve 27. .

  Next, the operation of the present embodiment having such a configuration will be described with reference to FIGS.

  First, the expansion joint structure 1A described above is installed between the existing pipes 30 and 40 in the building structure. In this case, the mounting flange 12a of the second sleeve 12 of the first bent universal joint 10 of the expansion pipe joint structure 1A and the mounting flange 30a of the existing pipe 30 are joined, and the mounting flange of the second sleeve 22 of the second bent universal joint 20 is joined. 22a and the mounting flange 40a of the existing pipe 40 are joined. Such existing pipes 30 and 40 are also displaced in the axial direction or a direction (eccentric direction) perpendicular to the axial direction due to secular change due to the influence of vibration or earthquake. Such deviations in the axial direction and the eccentric direction of the existing pipes 30 and 40 are absorbed by the expansion and contraction pipe joint structure 1 </ b> A expanding and contracting in the axial direction or being displaced in the eccentric direction. In this case, the deviations in the axial direction and the eccentric direction of the existing pipes 30 and 40 are not absorbed by the gimbal mechanism 10A including the gimbal ring 13 or the gimbal mechanism 20A including the gimbal ring 23, and the expansion pipe joint structure 1A. Is absorbed.

  First, FIGS. 1 and 7 to 10 show the reference shape of the expansion joint structure 1A. When the existing pipes 30 and 40 are separated from or approach each other from the state of the reference shape, and the expansion joint structure 1A expands and contracts along the axial direction, the first pipe 1 and the second pipe 2 particularly approach each other. When going, the elastic rubber ring 7 of the expandable joint 4 slides on the outer surface of the second pipe 2. As a result, the first pipe 1 and the second pipe 2 approach each other, and the expansion joint structure 1A contracts (see the solid line in FIG. 2).

  Next, when the first pipe 1 and the second pipe 2 are separated from each other, the elastic rubber ring 7 of the expandable joint 4 slides on the second pipe 2. As a result, the first pipe 1 and the second pipe 2 are separated from each other, and the expansion joint structure 1A extends (see a two-dot chain line in FIG. 2).

  Next, the existing pipes 30 and 40 do not leave or approach each other. However, when the existing pipes 30 and 40 are shifted in the eccentric direction, as shown in FIGS. With the displacement in the eccentric direction, the expansion joint structure 1A is displaced in the eccentric direction. Specifically, the first bendable universal joint 10 on the first pipe 1 side is arbitrarily selected from the directions (eccentric direction) orthogonal to the axial direction of the existing pipes 30 and 40 in accordance with the displacement of the existing pipes 30 and 40 in the eccentric direction. Bend in the direction of misalignment.

  Similarly, the second bendable universal joint 20 on the second pipe 2 side is also bent in the above-described arbitrary displacement direction of the existing pipes 30 and 40. And the 1st piping 1 and the 2nd piping 2 incline and extend between the 1st bending universal joint 10 and the 2nd bending universal joint 20. As shown in FIG.

  Next, when the existing pipes 30 and 40 approach each other and shift in the eccentric direction, the elastic rubber ring 7 of the expandable joint 4 slides on the outer surface of the second pipe 2 as shown in FIGS. Move. As a result, the first pipe 1 and the second pipe 2 approach each other, and the expansion joint structure 1A shrinks.

  At the same time, with the displacement of the existing pipes 30 and 40 in the eccentric direction, the expansion joint structure 1A is displaced in the eccentric direction. Specifically, the first bendable universal joint 10 on the first pipe 1 side is arbitrarily selected from the directions (eccentric direction) orthogonal to the axial direction of the existing pipes 30 and 40 in accordance with the displacement of the existing pipes 30 and 40 in the eccentric direction. Bend in the direction of misalignment.

  Similarly, the second bendable universal joint 20 on the second pipe 2 side is also bent in the above-described arbitrary displacement direction of the existing pipes 30 and 40. And the 1st piping 1 and the 2nd piping 2 incline and extend between the 1st bending universal joint 10 and the 2nd bending universal joint 20. As shown in FIG.

  Next, when the existing pipes 30 and 40 are separated from each other and shifted in the eccentric direction, as shown in FIGS. 5, 11, and 12, the elastic rubber ring 7 of the expandable joint 4 moves on the outer surface of the second pipe 2. Slide. As a result, the first pipe 1 and the second pipe are separated from each other, and the expansion joint structure 1A extends.

  At the same time, the expansion joint structure 1A is displaced in the eccentric direction with the displacement of the existing pipes 30 and 40 in the eccentric direction. Specifically, the first bendable universal joint 10 on the first pipe 1 side is arbitrarily selected from the directions (eccentric direction) orthogonal to the axial direction of the existing pipes 30 and 40 in accordance with the displacement of the existing pipes 30 and 40 in the eccentric direction. Bend in the direction of the deviation.

  Similarly, the second bendable universal joint 20 on the second pipe 2 side is also bent in the direction of the arbitrary displacement of the existing pipes 30 and 40. And the 1st piping 1 and the 2nd piping 2 incline and extend between the 1st bending universal joint 10 and the 2nd bending universal joint 20. As shown in FIG.

  As described above, according to the present embodiment, when the existing pipes 30 and 40 are displaced in the axial direction or in the eccentric direction orthogonal to the axial direction, the first pipe 1 and the second pipe 2 are mutually connected with the deviation. It expands and contracts. At the same time, the first bendable universal joint 10 and the first bendable universal joint 20 on the first pipe 1 side bend along any displacement direction of 360 °. As a result, even if the existing pipes 30 and 40 are displaced in the axial direction or in an eccentric direction orthogonal to the axial direction, the displacement in the axial direction and the eccentric direction is reliably absorbed by the expansion joint structure to adjust the deviation. be able to.

DESCRIPTION OF SYMBOLS 1 1st piping 1A expansion pipe joint structure 2 2nd piping 4 expansion joint 10 first bending universal joint 12 second sleeve 13 gimbal ring 15 first hinge 16 second hinge 17 sealing sleeve 18 sealing rubber ring 19 positioning rubber ring 20 Second bending universal joint 22 Second sleeve 23 Gimbal ring 25 First hinge 26 Second hinge 27 Seal sleeve 28 Sealing rubber ring 29 Positioning ring 30 Existing pipe 40 Existing pipe

Claims (4)

A first pipe;
A second pipe connected to the first pipe via an expandable joint;
A first bendable joint provided at an end of the first pipe opposite to the second pipe;
A second bendable universal joint provided at an end of the second pipe opposite to the first pipe;
The first bendable universal joint and the second bendable universal joint are each a first sleeve and a second sleeve that is joined to the first sleeve via a gimbal mechanism and can be bent to any angle of 360 °. And
The gimbal mechanism is provided at a joint portion between the first sleeve and the second sleeve, a gimbal ring that surrounds the joint portion from the outside in the radial direction, and a first hinge that connects the first sleeve and the gimbal ring. And a second hinge that connects the second sleeve and the gimbal ring.   A seal sleeve is provided radially inward of the gimbal ring to surround a joint portion of the first sleeve and the second sleeve from the radially outer side, between the inner surface of the seal sleeve and the outer surface of the first sleeve; and 2. The expansion joint structure according to claim 1, wherein a sealing rubber ring is interposed between the inner surface of the seal sleeve and the outer surface of the second sleeve.   3. The expansion and contraction according to claim 1, wherein the first sleeve is positioned axially inward with respect to the second sleeve, and the first pipe or the second pipe functions as a first sleeve. Pipe joint structure.   A pair of positioning rubber rings for positioning the seal sleeve in the axial direction are provided between a pair of outer surfaces in the axial direction of the seal sleeve and the first hinge and the second hinge. The expansion joint structure according to any one of Items 1 to 3.

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