JP2017061838A - Piping structure, and connection member for use in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping structure capable of coping with ground displacement, and a joint for use in the piping structure.SOLUTION: A joint 10A for a piping structure 1A includes a universal part 20, a flexible part 30, and a retainer 40. When ground is displaced by earthquakes and the like, the flexible part 30 is bent and displaced with respect to a branch pipe 90, and the universal part 20 and the retainer part 40 are turned to suppress stress concentration in such a manner as to interlock with the flexible part 30. Thus, the joint exerts the excellent effect of being capable of restraining piping from being broken due to ground displacement.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a piping structure excellent in earthquake resistance and a connecting member used in the piping structure.

  Conventionally, in the pipeline that guides drainage to the sewage main, when the ground changes due to an earthquake or the like, the connecting portion of the piping constituting the pipeline is damaged due to distortion and the sewage leaks. The structure which aimed at earthquake resistance which can suppress this is already known.

  For example, in Patent Document 1, a tube body having a receiving portion bulged and formed in a spherical shape at one end portion of a straight tube portion, and a receiving tube that is rotatably inserted into the receiving portion of the tube body. An angle adjustable synthetic resin pipe universal joint comprising a core having an outer surface shape that is the same shape as the inner surface shape of the portion is disclosed. In such a configuration, for example, when a pipeline is constructed between a sewage main pipe and a public mass having a difference in height, a slight connection error that occurs at a site where the pipes are connected to each other is caused by the synthetic resin. It can be absorbed appropriately by a universal joint for pipes and can be connected appropriately. Also, if the ground fluctuates and an external force is applied to the connection part between the tube and the core, the joint rotates correspondingly, and the stress concentration can be alleviated to avoid problems such as breakage. .

  Patent Document 2 discloses a branch pipe joint that includes a branch member made of hard plastic and a joint member made of a flexible material attached to the branch member. In such a configuration, even if ground fluctuation occurs such that the pipe shaft of the branching member and the pipe shaft of the joint member are moved in parallel with each other, the joint member is flexed following the movement, thereby reducing stress concentration and causing damage, etc. The problem can be avoided.

Japanese Utility Model Publication No. 62-146083 JP 2001-26973 A

  However, in the synthetic resin pipe universal joint disclosed in Patent Document 1, when an external force acts in a direction intersecting the pipe axis between the pipe body and the core, the distortion is absorbed. Stress concentration cannot be relaxed. For this reason, there exists a problem that it cannot fully respond to such ground fluctuation.

  Further, in the joint member disclosed in the above-mentioned Patent Document 2, when a ground change occurs in which the inclination angle of the pipe shaft changes between the branch member and the joint member, such a joint member is preferable. There is a problem that it is not possible to follow the above and damage cannot be suppressed.

  By the way, since it is necessary to dig up the pipe again to apply a new earthquake-resistant structure to the pipe structure once buried, there is a policy that can be made earthquake-proof beforehand at the time of construction considering the labor and cost desirable. Then, when constructing, the structure which makes earthquake resistance by combining the structure disclosed by patent document 1 and patent document 2 may be proposed. As shown in FIG. 7, this configuration is in a piping structure 100 that connects a common 101 and a sewage main pipe 102, and a flexible joint member 103 is connected adjacent to the common 101. Then, a joint 104 capable of adjusting the angle is connected adjacent to the sewage main pipe 102. However, if the components disclosed in Patent Document 1 and Patent Document 2 are simply combined and applied in this way, each component only functions independently, and the seismic effect obtained is limited. Problems arise.

  Therefore, the present invention provides a highly seismic-resistant piping structure that can suitably prevent the piping from being damaged even if distortion occurs due to ground fluctuation, and a joint used in the piping structure. With the goal.

  In the present invention, the drainage which is buried in the ground in a state where it is connected between the upstream pipe arranged on the upstream side and the downstream pipe arranged on the downstream side, flows from the upstream pipe to the downstream pipe. A pipe structure having a joint for guiding to the pipe, wherein the joint includes a tubular first movable part having an upstream pipe end connected to a downstream pipe end of the upstream pipe, and the first movable part A tubular second movable part having an upstream pipe end connected to the downstream pipe end and a downstream pipe end connected to the upstream pipe end of the downstream pipe, and The movable part is displaceable with respect to the upstream pipe so that the pipe axis of the first movable part can move at least in parallel with the pipe axis of the downstream pipe end of the upstream pipe, and the second movable part A portion of the pipe axis of the second movable part is tiltable with respect to the downstream pipe so as to be inclined with respect to the pipe axis of the upstream pipe end of the downstream pipe. A position capable, when the external force is applied to the joint, the first movable portion and the second movable portion is a pipe structure characterized by comprising displaced interlocked.

  In such a configuration, the joint located between the upstream side pipe and the downstream side pipe has a movable part that can move parallel to the upstream side pipe or the downstream side pipe and a movable part that can tilt. However, since each function is associated with different types of displacement functions, when the ground is displaced, strain generated in the piping structure can be effectively absorbed and stress concentration can be reduced. Here, since the first movable part and the second movable part are connected adjacent to each other, if ground fluctuation occurs and an external force acts on the joint, the first movable part and the second movable part The stress concentration can be relaxed in conjunction with the second movable part. Therefore, this invention can suppress effectively the failure | damage of the piping which comprises a piping structure by the synergistic effect of a 1st movable part and a 2nd movable part.

  Further, the first movable part is constituted by a tubular flexible part connected to the upstream pipe, and the second movable part has an upstream pipe end on a downstream pipe end of the flexible part. An upstream pipe end is pivotally connected to the connected universal part, and a downstream pipe end of the universal part, and a downstream pipe end is connected to the upstream pipe end of the downstream pipe. A receiving portion having a spherical inner surface is provided at the upstream pipe end of the receiving portion, and the spherical portion of the receiving portion is provided at the downstream pipe end of the universal portion. A connecting port portion having a spherical outer surface corresponding to the inner surface is provided, and the connecting port portion and the receiving port portion are arranged such that the spherical outer surface of the connecting port portion faces the spherical inner surface of the receiving port portion. A configuration that is rotatably fitted is desirable.

  In such a configuration, the first movable portion and the second movable portion can be configured with a simple structure, and a piping structure that can sufficiently cope with the displacement of the ground can be suitably provided. It becomes.

  Moreover, this invention is a connection member used for the said piping structure by which the said flexible part was comprised with the tubular flexible member, and the upstream pipe end part of the said universal part was comprised with the tubular socket body. The flexible member and the socket body, and the flexible member and the socket body are connected in a state where the tube axis of the flexible member and the tube axis of the socket body coincide with each other. This is a connecting member.

  In such a configuration, the tube axis of the flexible member, which is a component of the first movable part, and the tube axis of the socket body, which is a component of the second movable part, can be made to coincide with each other. Therefore, even if ground fluctuation occurs and an external force acts on the joint, the first movable portion and the second movable portion can be smoothly interlocked without waste.

  The piping structure of the present invention has an excellent effect that can suppress the piping from being damaged by the displacement of the ground.

  Moreover, the connection member used for the piping structure of this invention has the outstanding effect which can make a 1st movable part and a 2nd movable part interlock | cooperate smoothly without waste.

1 is a schematic diagram showing a piping structure according to Example 1. FIG. 1 is a partial cross-sectional plan view of a joint according to Example 1. FIG. It is explanatory drawing which shows the use condition of the coupling concerning Example 1. FIG. It is a longitudinal cross-sectional view which shows the connection member of the coupling concerning Example 1. FIG. It is a schematic diagram which shows the piping structure concerning Example 2. It is a schematic diagram which shows the piping structure concerning Example 3. It is a schematic diagram which shows a prior art example.

  Hereinafter, the embodiment which materialized the piping structure of the present invention and the connecting member used for the piping structure is described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

[Example 1]
As shown in FIG. 1, the piping structure 1 </ b> A is configured by piping for guiding wastewater concentrated in 91 to the sewage main pipe 80. Specifically, the upstream pipe 2A including the main pipe 91 and the branch pipe 90 connected to the main pipe 91, the downstream pipe 3A including the sewage main pipe 80, the upstream pipe 2A, and the downstream pipe 3A And a joint 10A disposed between the two. The upstream pipe 2A is arranged upstream of the joint 10A, and the joint 10A is buried in the ground in a state where the downstream pipe 3A is arranged downstream of the joint 10A.

Next, the joint 10A will be described with reference to FIG.
The joint 10 </ b> A includes a flexible portion 30 that is configured by a tubular flexible member 60 and serves as a first movable portion. And the upstream pipe end part 31 of this flexible part 30 is connected to the downstream pipe end part 91 of the branch pipe 90 which is the said upstream piping 2A.

  A convex step 35 is formed in a circumferential shape on the inner peripheral surface of the upstream pipe end 31 of the flexible part 30, and the edge of the downstream pipe end 91 of the branch pipe 90 is The branch pipe 90 and the flexible portion 30 are fixed by a well-known fixing means in a state of being abutted against the convex step portion 35.

  On the other hand, the downstream side pipe end 32 of the flexible part 30 is connected to the upstream side pipe end 21 of the free part 20 described later in a state where the belt body 37 is wound around the downstream side pipe end 32. It is connected.

  For example, the flexible member 60 constituting the flexible portion 30 is preferably made of a flexible synthetic resin made of synthetic rubber.

  Here, the flexible portion 30 is provided with a main portion 39 that is hollow without the end edge of the pipe material such as the branch pipe 90 to be connected entering. The main portion 39 can be expanded and contracted along the tube axis direction of the flexible portion 30, and can be deformed along a direction intersecting the tube axis direction, and further deformable in the twisting direction. It has become. That is, the main portion 39 can be elastically deformed in the above direction without being obstructed by an inflexible member such as the branch pipe 90.

  Further, the joint 10A includes a free portion 20 and a receiving portion 40 that constitute a second movable portion.

  First, the universal portion 20 is formed of a tubular member that is relatively hard with respect to the flexible portion 30, and its upstream side pipe end portion 21 is connected to the downstream side pipe end portion 32 of the flexible portion 30. ing. Specifically, a convex step part 36 is formed in a circumferential shape on the inner peripheral surface of the downstream pipe end part 32 of the flexible part 30, and the upstream pipe of the universal part 20 is formed on the convex step part 36. The edge of the end 21 is abutted, and the belt body 37 is wound and fixed to each other as described above.

  Further, the receiving portion 40 is also formed of a tubular member of the same quality as the free portion 20, and its upstream side pipe end 41 is connected to the downstream side pipe end 22 of the free portion 20. Further, the downstream side pipe end portion 42 of the receiving portion 40 is connected to an upstream side pipe end portion as a downstream side pipe constituted by an opening 81 formed in the side wall of the sewage main pipe 80. A saddle-shaped saddle portion 47 is provided on the peripheral surface of the downstream pipe end portion 42 of the receiving portion 40, and the saddle portion 47 can be attached around the opening 81 of the sewage main pipe 80. It has become.

  The members constituting the above-described free part 20 and the receiving part 40 are preferably made of a synthetic resin material that is relatively harder than the flexible member 60, for example, a material such as vinyl chloride resin. Is preferred.

  Furthermore, the said universal part 20 and the said receiving part 40 are connected so that rotation is mutually possible. More specifically, the universal portion 20 is composed of two members, a substantially straight pipe-shaped socket body 70 arranged on the upstream side and a connection port portion 24 connected to the downstream side of the socket body 70. ing. Here, the socket body 70 and the connection port portion 24 are connected to each other with an adhesive. Further, the connection port portion 24 has a spherical outer surface 25 having a spherical shape formed on the outer peripheral surface.

  On the other hand, the upstream pipe end portion 41 of the receiving portion 40 is formed with a receiving portion 44 having a spherical inner surface 45 having a spherical shape formed on the inner peripheral surface. The spherical inner surface 45 of the receiving port 44 has a curved shape corresponding to the spherical outer surface 25 of the connection port 24.

  In this configuration, the connection port portion 24 and the receiving port portion 44 are rotatably fitted so that the spherical outer surface 25 of the connection port portion 24 and the spherical inner surface 45 of the receiving port portion 44 face each other. By being attached, the universal portion 20 and the receiving portion 40 are connected to each other so as to be rotatable.

  As shown in FIG. 3, the joint 10 </ b> A described so far can rotate the connection port portion 24 of the universal portion 20 and the receiving portion 44 of the receiving portion 40. The universal part 20 and the receiving part 40 which are a part can be inclined within the range of the inclination angle α. For this reason, the universal part 20 has a tube axis of the universal part 20 with respect to the central axis of the opening 81 provided in the sewage main pipe 80 (corresponding to the pipe axis of the upstream pipe end of the downstream pipe). The sewage main pipe 80 can be displaced relatively so as to be inclined.

  In addition, since the main portion 39 of the flexible portion 30 is flexible and can be deformed, the tube axis of the flexible portion 30 is a downstream side pipe in the branch pipe 90 as shown in FIG. Parallel movement is possible within the range of the movement distance β with respect to the tube axis of the end portion 91.

  Further, since the main portion 39 is elastically deformable so as to be stretchable as described above, the separation distance between the sewage main pipe 80 and the branch pipe 90 can be varied within the range of the movement distance γ.

  Furthermore, since the main portion 39 can be elastically deformed in the torsional direction as described above, the main portion 39 can be connected between the sewer main pipe 80 and the branch pipe 90 or between the branch pipe 90 and the joint 10A. This structure allows torsion around the tube axis of the flexible portion 30.

  The pipe structure 1A including the joint 10A described so far includes at least a movable part that can be translated with respect to the branch pipe 90 or the sewage main pipe 80 and a movable part that can be tilted. Since they have different types of displacement functions, when the ground is displaced, the strain generated in the piping structure 1A can be effectively absorbed, stress concentration can be reduced, and damage can be prevented.

  Further, in the joint 10A, since the flexible portion 30 as the first movable portion and the free portion 20 as the second movable portion are adjacent and continuous, the ground fluctuation temporarily occurs and the joint When an external force is applied to 10A, the flexible portion 30 and the free portion 20 are displaced in conjunction with each other as shown in FIG. 3, and the stress concentration can be effectively reduced. In other words, such a configuration is complicated by the difference in characteristics because the flexible portion 30 that instantly deforms with respect to external force and the flexible portion 20 with a large movable angle range are adjacent to each other. It is possible to follow the displacement of the ground movement by moving appropriately. Further, in the joint 10A, in addition to the inclination angle α between the free portion 20 and the receiving portion 40, the tube axis of the flexible portion 30 is in a range of the moving distance β with respect to the tube axis of the branch pipe 90. Can be translated in parallel. For this reason, the movable range of the joint 10 </ b> A is effectively and effectively expanded in a range in which the movable range of the flexible portion 30 is added to the movable range of the free portion 20. Therefore, according to the present invention, an effect that the breakage of the pipe can be remarkably suppressed as compared with the conventional configuration can be obtained.

  The joint 10A may have a connecting member 50 as shown in FIG. That is, the connecting member 50 is configured such that the flexible member 60 and the socket body 70 are connected in advance, and the tube axis of the flexible member 60 and the tube axis of the socket body 70 coincide with each other. It has become. By constructing the joint 10A using such a connecting member 50, the tube shaft of the flexible member 60, which is one of the constituent elements of the first movable part, and one of the constituent elements of the second movable part. Since it is possible to easily realize a state in which the pipe axis of a certain socket body 70 is matched, even if ground fluctuation occurs and an external force acts on the joint 10A, the first movable portion and the second movable portion 70 The movable part can be smoothly linked without waste.

[Example 2]
The piping structure 1B of Example 2 will be described with reference to FIG. In addition, what has the structure similar to Example 1 attaches | subjects the same code | symbol, and abbreviate | omits description.

  The piping structure 1 </ b> B includes an upstream pipe 2 </ b> B including a main pipe 91 and a branch pipe 90 attached to the main pipe 91, and a downstream pipe 3 </ b> B including a sewage main pipe 80.

  A joint 10B is connected between the upstream pipe 2B and the downstream pipe 3B.

  Here, in the present embodiment, the joint 10B includes the branch pipe joint 93 attached to the pipe shaft of the downstream pipe end portion 92 of the branch pipe 90 which is the upstream pipe 2B and the sewage main pipe 80. It is arrange | positioned in the position which intersects with the tube axis.

  Even in such a configuration, since the joint 10B is disposed in the pipe structure 1B, stress concentration due to the displacement of the ground generated between the upstream pipe 2B and the downstream pipe 3B is preferably alleviated. Thus, damage to the piping can be suppressed.

Example 3
A piping structure 1C of Example 3 will be described with reference to FIG. In addition, what has the structure similar to Example 1, 2 attaches | subjects the same code | symbol, and abbreviate | omits description.

  The piping structure 1C including the joint 10C includes an upstream pipe 2C including the main pipe 91 and the branch pipe 90 attached to the main pipe 91, and a downstream pipe including the branch pipe joint 93 attached to the sewage main pipe 80. 3C.

  And it is embed | buried in the ground in the state in which the coupling 10C was connected between the said upstream piping 2C and the said downstream piping 3C.

  Moreover, the straight pipe part 48 extended toward the downstream is formed in the receiving part 40 in 10 C of couplings of a present Example. And the elbow pipe 49 is connected to the downstream pipe end part 42 corresponding to the lower end of this straight pipe part 48, and the piping structure 1C is comprised as a whole.

  In such a configuration, the joint 10 </ b> C is attached substantially adjacent to the trough 91. Even in such an arrangement mode, when there is a ground change, it is possible to suitably relieve the stress concentration generated between the upstream side pipe 2C and the downstream side pipe 3C and suppress breakage. .

  The dimensions and shapes of the respective parts of the piping structures 1A to 1C and the joints 10A to 10C described so far can be freely selected as appropriate.

  Moreover, the means and construction method which fix each member are not limited to the structure described in the said Example, A well-known technique may be employ | adopted suitably.

1A, 1B, 1C Piping structure 2A, 2B, 2C Upstream piping 3A, 3B, 3C Downstream piping 10A, 10B, 10C Joint 20 Free part (second movable part)
21 upstream pipe end 22 downstream pipe end 24 connection port 25 spherical outer surface 30 flexible part (first movable part)
31 upstream pipe end 32 downstream pipe end 40 receiving part (second movable part)
41 Upstream pipe end 42 Downstream pipe end 44 Receiving part 45 Spherical inner surface 50 Connecting member 60 Flexible member 70 Socket body

Claims (3)

A joint that is buried in the ground while being connected between an upstream pipe arranged on the upstream side and a downstream pipe arranged on the downstream side, and guides the drainage flowing from the upstream pipe to the downstream pipe. A piping structure comprising:
The joint is
A tubular first movable part having an upstream pipe end connected to a downstream pipe end of the upstream pipe;
A tubular second movable part in which an upstream pipe end is connected to the downstream pipe end of the first movable part, and a downstream pipe end is connected to the upstream pipe end of the downstream pipe;
With
The first movable part is displaceable with respect to the upstream pipe so that the pipe axis of the first movable part is at least parallel to the pipe axis of the downstream pipe end of the upstream pipe,
The second movable part is displaceable with respect to the downstream pipe so that a part of the pipe axis of the second movable part can be inclined with respect to the pipe axis of the upstream pipe end of the downstream pipe,
A piping structure characterized in that when an external force is applied to the joint, the first movable portion and the second movable portion are displaced in conjunction with each other. The first movable part is composed of a tubular flexible part connected to the upstream pipe,
The second movable part is
A free part having an upstream pipe end connected to a downstream pipe end of the flexible part;
An upstream pipe end is pivotally connected to the downstream pipe end of the universal part, and a receiving part is connected to the downstream pipe end of the downstream pipe.
The upstream pipe end of the receiving part is provided with a receiving part having a spherical inner surface,
A connection port portion having a spherical outer surface corresponding to the spherical inner surface of the receiving portion is provided at the downstream pipe end of the universal portion,
The piping structure according to claim 1, wherein the connection port portion and the receiving portion are rotatably fitted such that the spherical outer surface of the connection port portion and the spherical inner surface of the receiving portion face each other. . The connecting member used in the piping structure according to claim 2, wherein the flexible part is formed of a tubular flexible member, and the upstream pipe end of the flexible part is formed of a tubular socket body. And
Consisting of the flexible member and the socket body,
A connecting member, wherein the flexible member and the socket body are connected in a state in which the tube axis of the flexible member and the tube axis of the socket body coincide with each other.

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