JP3761266B2 - Pipe joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to a pipe system of a fluid transport pipe such as a water pipe buried in the ground, intersecting with a compressive force or tensile force in the direction of the cylinder axis due to an earthquake or non-uniform subsidence, or with respect to the cylinder axis. When an external force such as a shearing force or a bending moment acting in the direction is applied, this external force is absorbed as much as possible in the pipe connecting portion, and the breakage at the fragile portion of the piping system can be suppressed. In addition, one end side of the second cylindrical body is inserted and connected in a sealed state so as to be relatively movable in the cylinder axis direction within a certain range, and a third cylindrical body is connected to the other end side of the second cylindrical body. The present invention relates to a pipe joint structure that is externally fitted and connected in a sealed state so as to be capable of relative oscillation.
[0002]
[Prior art]
As a pipe joint structure of this type, conventionally, as shown in FIG. 5, a spherical cylindrical portion 52 </ b> A formed on the other end side of the second cylindrical body 52 is formed on one end side of the third cylindrical body 53. The partial spherical cylinder of the connecting cylinder 54 provided with a partial spherical cylinder 53A and a connecting flange 54B that can be fixedly connected to the connecting flange 53B protruding from the outer peripheral surface of the partial spherical cylinder 53A via a bolt 55 and a nut 56. The portion 54A is externally fitted from both sides in the cylinder axis direction, and the connection flange 53B on the third cylindrical body 53 side and the connection flange 54B of the connection cylinder 54 are fastened with bolts 55 and nuts 56. The second cylindrical body 52 and the third cylindrical body 53 are connected to each other so as to be swingable and slidable relative to each other along the outer peripheral surface of the spherical cylindrical portion 52A. The outer peripheral surface of the cylindrical tube portion 52B and the end portion 54a of the connecting tube 54 At the intermediate portion spaced from the swing region toward the first cylindrical body 51, the maximum movement position of the first cylindrical body 51 toward the third cylindrical body 53 is set to the end of the first cylindrical body 51. There has been proposed a projection in which a stopper portion 57 that is restricted by contact with 51a is formed (see, for example, Japanese Utility Model Publication No. 57-71883).
[Problems to be solved by the invention]
In the conventional pipe joint structure, even if the external force in the compression direction due to an earthquake or non-uniform settlement acts, the first cylindrical body 51 moves to the maximum extent toward the third cylindrical body 53, Since the maximum movement position of the end portion 51a of the first cylindrical body 51 is restricted by the stopper portion 57 to a position outside the swinging region of the end portion 54a of the connecting cylinder 54, the second cylinder The end 51a of the first cylindrical body 51 whose outer diameter is larger due to the presence of a sealing structure such as a sealing material than the outer diameter of the linear cylindrical portion 52B of the cylindrical body 52 is The second cylindrical shape resulting from the entry of the end portion 51a of the first cylindrical body 51 without entering between the end portion 54a and the outer peripheral surface of the linear cylindrical portion 52B of the second cylindrical body 52. A decrease in the bending swing range of the body 52 and the third cylindrical body 53 can be suppressed.
However, the stopper portion 57 is positioned at the intermediate position in the cylinder axis direction of the linear cylindrical portion 52B of the second cylindrical body 52 that is largely separated from the swing region of the end portion 54a of the connecting cylinder 54 toward the first cylindrical body 51. Therefore, the entire length of the second cylindrical body 52 is increased, and the size and weight of the pipe joint structure are easily increased.
Moreover, when the second cylindrical body 52 and the third cylindrical body 53 are relatively swung up to the maximum bending angle, the end portion 54a of the connecting cylinder 54 is formed on the straight cylindrical portion 52B of the second cylindrical body 52. Since strong pressure is applied to the outer peripheral surface, there is a possibility that damage such as cracks may be caused in the second cylindrical body 52 due to stress concentration at this portion.
[0003]
The present invention has been made in view of the above circumstances, and the main problem is that the outer diameter of the stopper portion can be made smaller than the outer diameter of the end portion of the second cylindrical body. Paying attention to the position of the stopper, the two cylindrical bodies are bent to the maximum while the relative swinging range between the second cylindrical body and the third cylindrical body is made as large as possible. It is an object of the present invention to provide a pipe joint structure that can suppress breakage in the case of being made, and that can simultaneously achieve a reduction in size and weight of the pipe joint structure.
[0004]
[Means for Solving the Problems]
The characteristic structure of the pipe joint structure according to claim 1 of the present invention is that, in the structure described in the opening paragraph, on the outer peripheral surface of the second tubular body, the maximum of the end portion of the first tubular body toward the third tubular body side is provided. A stopper is formed to project and restrict the movement position outside the swing region of the end of the third cylindrical body, and the second cylindrical body and the third cylindrical body swing relative to each other up to the maximum bending angle. When it does, it exists in the point comprised so that the edge part of a 3rd cylindrical body might contact | connect the outer peripheral surface of a stopper part.
According to the above characteristic configuration, even when an external force in the compression direction due to an earthquake, non-uniform subsidence, etc. acts and the end of the first cylindrical body contracts and moves to the third cylindrical body side to the maximum extent, Since the maximum movement position of the end portion of the first cylindrical body is restricted by the stopper portion to a position outside the swing region of the end portion of the third cylindrical body, The end portion of the first cylindrical body whose outer diameter is larger due to the presence of a sealing structure such as a sealing material than the outer diameter of the end portion is the end inner peripheral surface of the third cylindrical body and the second end surface. It does not enter between the outer peripheral surfaces of the cylindrical body.
Moreover, when an external force such as a shearing force or a bending moment due to an earthquake or non-uniform subsidence acts, the second cylindrical body and the third cylindrical body relatively swing to the maximum bending angle. Since the end portion of the cylindrical body comes into contact with the outer peripheral surface of the stopper portion having a high mechanical strength that is formed to protrude from the outer peripheral surface of the second cylindrical body, it is possible to reliably receive an external force with this stopper portion. . Furthermore, while configuring the relative movement range of the first cylindrical body and the second cylindrical body to the same movement range as before, the stopper portion is close to the end of the third cylindrical body, The total length of the second cylindrical body can be shortened.
Still, since the outer diameter of the stopper portion can be configured to be smaller than the outer diameter of the end portion of the first cylindrical body to which a sealing structure such as a sealing material is added, the end portion of the first cylindrical body is The relative swinging range between the second cylindrical body and the third cylindrical body is increased as compared with the case where the second cylindrical body enters between the end of the third cylindrical body and the outer peripheral surface of the second cylindrical body. be able to.
Therefore, by devising the position where the stopper portion is formed as described above, the two cylindrical bodies are maximized while the relative swinging range between the second cylindrical body and the third cylindrical body is made as large as possible. It is possible to suppress breakage when bent, and to achieve a reduction in size and weight of the pipe joint structure at the same time.
[0005]
The characteristic structure of the pipe joint structure according to claim 2 of the present invention is that when the second tubular body and the third tubular body are relatively swung to the maximum bending angle, the end portion of the third tubular body and the stopper It is in the point comprised so that the outer peripheral surface of a part may contact | connect along a cylinder axial direction.
According to the above characteristic configuration, when the second cylindrical body and the third cylindrical body are relatively swung to the maximum bending angle, and the end of the third cylindrical body is pressed against the outer peripheral surface of the stopper portion. Since the pressure contact force can be dispersedly supported in the cylinder axis direction, the durability performance of the pipe joint structure can be improved.
[0006]
According to a third aspect of the present invention, there is provided a pipe joint structure having a characteristic configuration in which a spherical cylindrical portion formed on the other end side of the second cylindrical body is swingable relative to the spherical cylindrical portion along the outer peripheral surface thereof. A third cylindrical body having a partial spherical cylindrical portion is fitted from one side in the cylindrical axis direction, and an outer peripheral surface of the spherical cylindrical portion of the second cylindrical body and a portion of the third cylindrical body A sliding contact guide member that is in sliding contact with the outer peripheral surface of the spherical cylindrical portion of the second cylindrical body is fitted into the gap formed between the inner peripheral surface of the spherical cylindrical portion from the other side in the cylindrical axis direction, The second cylindrical body and the third cylindrical body are connected to each other so as to be slidably swingable relative to each other.
According to the above characteristic configuration, when the second cylindrical body and the third cylindrical body are connected to each other so as to be swingable and swingable relative to each other, the sliding contact guide member is used as a spherical cylinder of the second cylindrical body. Since it fits in the gap formed between the outer peripheral surface of the part and the inner peripheral surface of the partial spherical cylindrical part of the third cylindrical body from the direction of the cylinder axis, the connecting flange as in the conventional pipe joint structure In addition, connecting components such as bolts and nuts do not protrude outward in the radial direction, and the pipe joint structure can be made compact and the outer shape can be simplified.
Moreover, by adopting such a retaining connecting means, the opening diameter of the gap formed between the inner peripheral surface of the end of the third cylindrical body and the outer peripheral surface of the second cylindrical body is In some cases, the outer diameter of the end portion of the first tubular body may be larger than that of the end portion of the first tubular body. Even in this case, the stopper portion can prevent the end portion of the first tubular body from entering. The described effect can be surely exhibited.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
The pipe joint structure for fluid transportation (for example, for water supply) shown in FIG. 1 and FIG. 2 is provided on each of both end sides of a cast iron straight tubular first joint pipe 1 as the first tubular body A. One end side of the second joint pipe 2 made of cast iron as the cylindrical body B is inserted and connected in a sealed state so as to be relatively movable in the cylinder axis X direction (tube axis direction) within a certain range. A cast iron third joint pipe 3 serving as a third cylindrical body C is fitted to each other end side of the joint pipe 2 so as to be relatively swingable in a sealed state. The second joint pipe 2 and both the third joint pipes 3 are connected in communication.
[0008]
As shown in FIGS. 1 to 3, each of the outer peripheral surfaces of the straight pipe portions 2 </ b> B of both the second joint pipes 2 inserted into the first joint pipe 1 includes the first joint pipe 1. An annular mounting groove 5 that is smaller in length in the cylinder axis X direction than the annular regulating groove 4 formed in the middle portion in the cylinder axis X direction on the inner peripheral surface of the inner circumferential surface is formed. The diameter of the stainless steel C made of deformable stainless steel that restricts the withdrawal of the first joint pipe 1 from the one end side of the second joint pipe 2 by the surface contact with the end face 4a in the cylinder axis X direction of the regulation groove 4 is as follows. A character-shaped locking member 6 is detachably fitted, and is inserted and connected to the first joint pipe 1 so as to be relatively movable in a state of preventing the second joint pipe 2 from coming out on one end side.
Further, the opposing distance in the cylinder radial direction (diameter direction) between the outer peripheral surface of the straight pipe portion 2B of the second joint pipe 2 and the inner peripheral surface 4b of the restricting groove 4 is allowed to insert and remove the locking member 6. It is configured at intervals. In other words, an annular space is formed between the outer peripheral surface of the straight pipe portion 2B of the second joint pipe 2 and the inner peripheral surface 4b of the restriction groove 4 to permit the insertion and removal of the locking member 6. It is.
Further, as shown in FIG. 3, an external force (tensile force) in the pulling direction caused by an earthquake, non-uniform settlement, etc. acts on the pipe joint structure, so that the opening end side of the first joint pipe 1 (second joint pipe) Each of the locking members 6 fitted in the mounting grooves 5 of the second joint pipes 2 is brought into surface contact with the end surfaces 4a of the restriction grooves 4 positioned on the insertion side 2) from the cylindrical axis X direction. In this case, a diameter expansion restricting portion 7 is provided to prevent the locking member 6 from coming out from the mounting groove 5 outward in the cylinder radial direction.
[0009]
As shown in FIG. 3, each of the both diameter expansion restricting portions 7 is in the state of being close to the outer peripheral surface 6 a of the locking member 6 contacting the one end surface 4 a of the restricting groove 4. 4b, the outer peripheral surface 6a and the diameter expansion regulating surface 7a of the locking member 6 are each configured to be parallel or substantially parallel to the cylinder axis X. ing.
Each of the end surfaces 6c on both sides of the locking member 6 in the cylinder axis X direction and both end surfaces 4a of the restriction groove 4 in the cylinder axis X direction are orthogonal to or substantially orthogonal to the cylinder axis X. A boundary surface portion 4c is formed on the tapered surface that is continuous with the both diameter-enlargement regulating surfaces 7a of the inner circumferential surface 4b of the regulating groove 4 while being configured as a flat surface along the direction.
[0010]
As shown in FIG. 1 to FIG. 4, the spherical tube portion 2 </ b> A as a spherical tube portion having a partially spherical outer peripheral surface 2 a formed on the other end side of both the second joint tubes 2. A partial spherical tube portion 3A as a partial spherical tube portion provided with a partial spherical inner peripheral surface 3b and a circumferential inner peripheral surface 3c that can swing and swing relative to each other along the outer peripheral surface of 2A. The third joint pipe 3 provided is fitted from the outside of the other end side of the second joint pipe 2 in the cylinder axis X direction, and the outer peripheral surface 2a of the spherical pipe portion 2A of the second joint pipe 2 A second slidable contact with the outer peripheral surface 2a of the spherical tube portion 2A of the second joint tube 2 is formed in a gap formed between the circumferential surface-shaped inner peripheral surface 3c of the partial spherical tube portion 3A of the three joint tube 3. The spherical sliding contact surface 13a that is in sliding contact with the outer peripheral surface 2a of the spherical tube portion 2A of the joint pipe 2 and the circumferential inner peripheral surface 3c of the partial spherical tube portion 3A of the third joint pipe 3 are in sliding contact. A slidable contact guide member 13 made of cast iron having a circumferential slidable contact surface 13b is fitted from the first joint pipe 1 side in the cylindrical axis X direction, and further, a partial spherical tube portion of the third joint pipe 3 C-shaped dropout made of stainless steel that can be reduced in diameter to prevent the sliding movement of the sliding guide member 13 from coming into contact with the holding groove 3d formed on the inner peripheral surface 3c of the 3A circumferential surface. The stopper member 14 is detachably fitted to prevent the sliding contact guide member 13 from moving out of the gap, thereby allowing the second joint pipe 2 and the third joint pipe 3 to swing relative to each other. It is connected to the stopper.
[0011]
Further, as shown in FIGS. 2 and 4, external force in the compression direction due to an earthquake or non-uniform subsidence acts on the pipe joint structure on each of the outer peripheral surfaces of the straight pipe portions 2B of both the second joint pipes 2. Then, the end portion 1a of the first joint pipe 1 is brought into surface contact with the cylindrical axis X direction, and the maximum movement position of the end portion 1a of the first joint pipe 1 toward the third joint pipe 3 side is determined as the third joint. A stopper portion 8 for restricting contact is formed integrally outside the swinging region of the end portion 3a of the tube 3 on the first joint tube 1 side, and the end surface 4a of the restricting groove 4 and the locking member 6 are Relative movement range in the cylinder axis X direction between the first joint pipe 1 and the one second joint pipe 2 by the surface contact and the surface contact between the end portion 1a of the first joint pipe 1 and the stopper portion 8. Is regulated to be within a certain range.
The stopper portion 8 is composed of an annular ridge formed integrally on the outer peripheral surface of the straight pipe portion 2B of the second joint pipe 2 along the circumferential direction thereof. The outer diameter of the outer peripheral surface of the stopper portion 8 is configured to be smaller than the maximum outer diameter of the end portion 1 a of the first joint pipe 1.
[0012]
As shown in FIGS. 2 and 4, when an external force such as a shearing force or a bending moment in a direction intersecting the cylindrical axis X due to the earthquake or non-uniform settlement acts on the pipe joint structure, the second Relative sliding along the spherical surface of the outer peripheral surface 2a of the spherical tube portion 2A of the joint tube 2 and the spherical inner peripheral surface 3b of the partial spherical tube portion 3A of the third joint tube 3, and the spherical shape of the second joint tube 2 The second joint pipe 2 and the third joint pipe 3 swing relative to each other by relative sliding along the spherical surface of the outer peripheral surface 2a of the pipe portion 2A and the spherical sliding contact surface 13a of the sliding contact guide member 13. Can be bent, and damage to the pipe joint structure can be suppressed.
Further, when the second joint pipe 2 and the third joint pipe 3 swing relative to each other up to the maximum bending angle along the spherical surface, the first joint pipe 1 and the third joint pipe 3 do not interfere with each other. In this state, the opening inner peripheral edge corner portion 3 e of the end portion 3 a of the third joint pipe 3 is configured to contact the outer peripheral surface of the stopper portion 8. Specifically, as shown in FIG. 4, when the second joint pipe 2 and the third joint pipe 3 swing relative to each other up to the maximum bending angle along the spherical surface, the end portion 1a of the first joint pipe 1 is obtained. The third joint pipe 3 and the end portion 3a are not in contact with each other, and the opening inner peripheral edge corner portion 3e and the outer peripheral surface of the stopper portion 8 are in contact with each other along the cylindrical axis X direction. is there.
That is, the stopper portion 8 is formed at a position on the outer peripheral surface of the straight pipe portion 2B of the second joint pipe 2 that intersects the swinging locus of the opening inner peripheral corner portion 3e of the end 3a of the third joint pipe 3. Then, in a state where the second joint pipe 2 and the third joint pipe 3 are swung relative to each other up to the maximum bending angle, the opening inner peripheral edge corner portion 3e is formed on the outer peripheral surface of the stopper portion 8 on the cylindrical axis. It is formed on a tapered surface along the X direction.
[0013]
As shown in FIGS. 1 to 4, the outer peripheral surface of the straight pipe portion 2 </ b> B of the second joint pipe 2 is located near both ends of the inner peripheral surface of the first joint pipe 1 in the cylinder axis X direction. An annular seal holding groove 10 is formed to hold a first elastic sealing material 9 made of synthetic rubber (for example, styrene butadiene rubber), which is an example of a sealing structure that seals between the third joint pipes 3 and 3. Synthetic rubber which is an example of a sealing structure that seals between the inner peripheral surfaces 3b and 3c of the partial spherical tube portion 3A and the outer peripheral surface 2a of the spherical tube portion 2A of the second joint pipe 2 ( For example, an annular seal holding groove 12 for holding a second elastic sealing material 11 made of styrene butadiene rubber is formed, and fluid transport is provided to each end of the straight pipe portion 3B of the third joint pipe 3. Fix other fluid piping devices P such as pipes (for example, water pipes) and gate valves with bolts and nuts. A plurality of connecting through-holes 3f for connecting are integrally formed a coupling flange 3C having coaxially circular.
[0014]
Therefore, in the pipe joint structure configured in this way, an external force in the compression direction caused by an earthquake, non-uniform subsidence, etc. acts, and the end portion 1a of the first joint pipe 1 is maximized toward the third joint pipe 3 side. Even when contracted and moved, the maximum movement position of the end portion 1a of the first joint pipe 1 is restricted to a position deviated from the swinging region of the end portion 3a of the third joint pipe 3 by the stopper portion 8. Therefore, compared to the outer diameter of the end portion of the second joint pipe 2, the end of the first joint pipe 1 whose outer diameter is increased due to the presence of the first elastic sealing material 9 which is an example of a sealing structure. The part 1 a does not enter between the inner peripheral surface of the end 3 a of the third joint pipe 3 and the outer peripheral surface of the second joint pipe 2.
Moreover, when an external force such as a shearing force or a bending moment due to an earthquake or uneven subsidence acts, the second joint pipe 2 and the third joint pipe 3 are relatively swung to the maximum bending angle. An opening inner peripheral edge corner portion 3e of the end portion 3a of the joint pipe 3 protrudes from the outer peripheral surface of the second joint pipe 2 and extends along the cylinder axis X direction on the outer peripheral surface of the stopper portion 8 having high mechanical strength. In other words, the inner peripheral edge corner portion 3e of the end portion 3a of the third joint pipe 3 has a wall thickness of the outer peripheral surface of the straight pipe portion 2B of the second joint pipe 2. Since it contacts the outer peripheral surface of the thickest stopper portion 8 along the direction of the cylinder axis X, the stopper portion 8 reliably receives and disperses the external force as a pressure contact force from the end portion 3a of the third joint pipe 3. Can be supported.
[0015]
[Other Embodiments]
(1) In the first embodiment described above, the stopper portion 8 is integrally projected on the outer peripheral surface of the second tubular body B. However, the stopper portion 8 formed separately from the second tubular body B is provided. The second cylindrical body B may be fixed to a predetermined position on the outer peripheral surface. In this case, the material of the stopper portion 8 is not limited to cast iron, and may be stainless steel, hard synthetic resin, or synthetic rubber.
(2) In the first embodiment described above, the stopper portion 8 is constituted by an annular ridge, but is not limited to this shape, for example, along the circumferential direction of the second cylindrical body B. You may comprise from the processus | protrusion group formed intermittently.
(3) In the first embodiment described above, a pipe joint comprising a combination of five cylindrical bodies, one first cylindrical body A, two second cylindrical bodies B, and two third cylindrical bodies C. Although the structure has been described, the first cylindrical body A, one second cylindrical body B, and one third cylinder provided with a connecting portion that can be integrally connected to another cylindrical body on the other end side. The technique of the present invention can also be applied to a pipe joint structure formed by combining three cylindrical bodies with the cylindrical body C.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view showing a first embodiment of a pipe joint structure according to the present invention. FIG. 2 is an overall view when an external force in a compression direction and an external force in a direction intersecting a cylinder axis are received. Longitudinal sectional view [Fig. 3] Enlarged sectional view of the main part when receiving external force in the pulling direction [Fig. 4] Main part when receiving external force in the compressing direction and external force in the direction intersecting the cylinder axis Fig. 5 is a longitudinal sectional view showing a conventional pipe joint structure.
A 1st cylindrical body (1st joint pipe)
B 2nd cylindrical body (2nd joint pipe)
C 3rd cylindrical body (3rd joint pipe)
X cylindrical shaft core 1a end surface 2A spherical cylindrical portion 2a outer peripheral surface 3A partial spherical cylindrical portion 3a end portion 3c inner peripheral surface 8 stopper portion 13 sliding contact guide member

Claims (3)

One end side of the second cylindrical body is inserted and connected to the first cylindrical body in a sealed state so as to be relatively movable in the cylinder axis direction within a certain range, and the other end side of the second cylindrical body is connected to the other end side of the second cylindrical body. A pipe joint structure in which three cylindrical bodies are externally connected in a sealed state so as to be relatively swingable,
Limiting the position of the maximum movement of the end of the first cylindrical body toward the third cylindrical body on the outer peripheral surface of the second cylindrical body outside the swing region of the end of the third cylindrical body When the second cylindrical body and the third cylindrical body swing relative to the maximum bending angle, the end of the third cylindrical body contacts the outer peripheral surface of the stopper section. A pipe joint structure configured as described above. When the second cylindrical body and the third cylindrical body swing relative to each other up to the maximum bending angle, the end of the third cylindrical body and the outer peripheral surface of the stopper portion are in contact with each other along the cylinder axis direction. The pipe joint structure according to claim 1, which is configured to hit. A third cylindrical body provided with a partial spherical cylindrical portion that can swing relative to and slide along the outer peripheral surface of the spherical cylindrical portion on the spherical cylindrical portion formed on the other end side of the second cylindrical body is a cylinder. A gap that is fitted from one side in the axial direction and formed between the outer peripheral surface of the spherical cylindrical portion of the second cylindrical body and the inner peripheral surface of the partial spherical cylindrical portion of the third cylindrical body Further, a sliding contact guide member slidably contacting the outer peripheral surface of the spherical cylindrical portion of the second cylindrical body is fitted from the other side in the cylindrical axis direction, and the second cylindrical body and the third cylindrical body are The pipe joint structure according to claim 1 or 2, wherein the pipe joint structure is connected so as to be swingable relative to the sliding contact.

Images