JP2016017600A - Expansion flexible joint and method for mounting the same - Google Patents

Abstract

An expansion / contraction flexible joint capable of easily and reliably connecting an expansion / contraction flexible joint between a first pipe and a second pipe, and a method for attaching the expansion / contraction flexible joint. An expansion / contraction flexible joint (1) for flexibly connecting an end of a first pipe (2) and an end of a second pipe (3) so as to be expandable and contractible, and attached to the first pipe The first flange (4), the first sleeve (6) attached to the first flange, the second flange (5) attached to the second pipe, and the second sleeve (6) attached to the second flange ), A seal member (8) for sealing between the outer peripheral surface of the first sleeve and the inner peripheral surface of the second sleeve so as to be slidable with each other, and a distance between the first flange and the second flange (D) has a length connectable to the maximum allowable interval, and can be bent when the interval is shorter than the maximum interval, and the first flange and the second flange have a predetermined strength or more at the maximum interval. Can be cut when receiving external force in the direction away from each other (9) , Characterized in that it comprises a. [Selection] Figure 2

Description

  The present invention relates to an expansion / contraction flexible joint and a method for attaching the expansion / contraction flexible joint, and more particularly, to an expansion / contraction flexible joint and a method for attaching an expansion / contraction flexible joint that can safely and easily connect pipes to each other.

  Connecting pipes buried in the ground or underwater using an expansion / contraction flexible joint is performed. The expansion / contraction flexible joint allows, for example, mutual displacement between pipes even when subjected to vibrations caused by an earthquake or the like, and allows a sealed connection relationship to be maintained. Examples of the pipes include a pipe connected to a building structure and a pipe discharging water to a river or the sea.

  In many cases, work is performed on-site when pipes are connected to an expansion / contraction flexible joint. When connecting the expansion and contraction flexible joints to each other in the field environment, the connected pipes easily move relative to each other. It is necessary to attach the expansion / contraction flexible joint while paying attention to the positional relationship.

JP-A-5-164279

  Conventionally, for example, when the relative movement between the pipes is allowed when the distance between the first flange and the second flange of the expansion / contraction flexible joint is within 50 mm with respect to 200 mm, for example, the distance between the first flange and the second flange is As it is between 150 mm and 250 mm, especially with the ruler so that the distance between the first flange and the second flange does not exceed 250 mm, it is monitored and the pipes are expanded and contracted so that the pipes are not disconnected from each other. Assembling and connecting the flexible joint has been performed. In general, the working environment for assembling and attaching the expansion / contraction flexible joint to the pipe is not always sought due to receiving a fluid external force such as water.

  Thus, conventionally, in order to prevent the pipes from being removed from each other, assembly connection is performed while always monitoring the distance between the first flange and the second flange.

  However, monitoring in the field so that the distance between the first flange and the second flange is within a predetermined range may cause the pipe to constantly move relative to each other, and the end of the pipe is viewed from the outside. It is not easy to confirm directly from the outside whether or not there is a risk that the piping may be removed, and it is complicated to constantly monitor the distance between the first flange and the second flange. .

  Moreover, in order to maintain the space | interval between a 1st flange and a 2nd flange at a desired space | interval, the 1st flange and 2nd flange to connect are temporarily connected using a lock bolt, and an expansion / contraction flexible joint is assembled and connected. Can also be considered. However, in the past, there was no idea of using the lock bolt in the process of assembling the expansion / contraction flexible joint to the pipe, and even if the lock bolt is used, the first flange and the second flange are not like the lock bolt. In the case of connecting with a rigid body, an unexpected load may be applied to the related equipment connected to the pipe via the lock bolt, which is a rigid body, and the related equipment may be damaged.

  Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an expansion / contraction flexible joint capable of simply and reliably mounting the expansion / contraction flexible joint between the first pipe and the second pipe. It is to provide a method.

  In order to achieve the above object, an expansion / contraction flexible joint according to the present invention is an expansion / contraction flexible joint that flexibly connects an end of a first pipe and an end of a second pipe in an expandable manner. A first flange attached to the first pipe, a first sleeve attached to the first flange, a second flange attached to the second pipe, and a second sleeve attached to the second flange; A seal member that seals between the outer peripheral surface of the first sleeve and the inner peripheral surface of the second sleeve so as to be slidable flexibly with each other, and an interval between the first flange and the second flange is allowed. The first flange and the second flange have a length that is connectable to the maximum interval and can be bent when the interval is shorter than the maximum interval, and the first flange and the second flange have a predetermined strength or more at the maximum interval. The external force of each other Characterized in that it comprises a and a coupling cleavable when subjected to the separating direction.

  Further, the predetermined strength is a strength capable of giving an unexpected load force to related equipment connected to the first pipe or the second pipe when the first flange or the second flange receives an external force. Features.

  Further, the connector includes a first bolt nut for attaching the first pipe to the first flange and a second bolt nut for attaching the second pipe to the second flange. It is attached between the 2nd flange, It is characterized by the above-mentioned.

  Moreover, two said connection tools are provided in the position which opposes, It is characterized by the above-mentioned.

  The connector is made of a plate material and is formed by press bending both ends.

  Moreover, the said connection tool is formed in the string body, It is characterized by the above-mentioned.

The expansion / contraction flexible joint attachment method according to the present invention is an expansion / contraction flexible joint attachment method that flexibly attaches / contracts the expansion / contraction flexible joint between the end of the first pipe and the end of the second pipe. The first sleeve includes a sealing member that seals between the outer peripheral surface of the first sleeve attached to the first flange and the inner peripheral surface of the second sleeve attached to the second flange in a slidable manner. Between the first flange and the second sleeve, and a length that allows the first flange and the second flange to be connected with a maximum allowable gap between the first flange and the second flange. The first flange and the second flange have a length connectable to a maximum interval in which an interval between the first flange and the second flange is allowed, and can be bent when the interval is shorter than the maximum interval, The interval is the maximum interval A cleavable connector when said one flange second flange is subjected to an external force greater than a predetermined intensity away towards each other, the attachment between the second flange and the first flange,
A first flange is attached to the first pipe, and a second flange is attached to the second pipe.

  The expansion / contraction flexible joint according to the present invention has a length that allows the first flange and the second flange to be connected to a maximum interval in which the interval between them is allowed, and can be bent when the interval is shorter than the maximum interval. Since the first flange and the second flange are provided with a coupling that can be cut when the first flange and the second flange receive an external force of a predetermined strength or more in the direction away from each other at the maximum distance, the first flange and the second flange are excessively unstable. It is possible to attach the expansion / contraction flexible joint between the first pipe and the second pipe while maintaining a stable connection state without being separated from each other. So that it is safe and reliable to attach to the equipment, and when a large external force is applied, the connecting tool is cut so as not to apply an unexpected load to the related equipment connected to the first pipe or the second pipe. can do.

The perspective view which shows the expansion-contraction flexible joint which concerns on embodiment of this invention. Sectional drawing which shows the state which has the connection tool which connects a 1st flange and a 2nd flange in a basic shape. FIG. 3 is an end view corresponding to FIG. 2. A view and B view respectively show those viewed from A and B of FIG. Sectional drawing which shows the state which the connector which connects the space | interval of a 1st flange and a 2nd flange bent. Sectional drawing which shows the state which the connector which connects a 1st flange and a 2nd flange was tense without bending. Sectional drawing which shows the coupling tool which connects a 1st flange and a 2nd flange in the state inclined mutually. Sectional drawing which shows the state from which the 1st flange and the 2nd flange shifted | deviated from each other and the connector was tense without bending. It is a figure which shows an example of a coupling tool, (a) is a top view, (b) is an elevation view, (c) is a side view.

Hereinafter, an expansion / contraction flexible joint repair device according to an embodiment of the present invention will be described with reference to the drawings.
The expansion / contraction flexible joint 1 according to the present embodiment is the expansion / contraction flexible joint 1 that flexibly connects the end of the first pipe 2 and the end of the second pipe 3 so as to be expandable / contractible. The expansion / contraction flexible joint 1 includes a first flange 4 attached hermetically to the first pipe 2, a first sleeve 6 attached to the first flange 4, and a second flange hermetically attached to the second pipe 3. 5, a second sleeve 7 attached to the second flange 5, and a ring-shaped seal that seals between the outer peripheral surface of the first sleeve 6 and the inner peripheral surface of the second sleeve 7 in a flexible and slidable manner. A seal member 8 and a connector 9 for connecting the first flange 4 and the second flange 5 are provided.

  The connecting tool 9 has a length that allows the first flange 2 and the second flange 3 to be connected to each other with a maximum distance between them. The connector 9 can be bent when the distance between the first flange 4 and the second flange 5 is shorter than the maximum distance. The connector 9 can be cut by itself when the first flange 4 and the second flange 5 receive an external force larger than a predetermined strength in the direction away from each other when the distance is the maximum distance.

  Here, the predetermined strength is, for example, an unexpected load force applied to related equipment including a house connected to the first pipe 2 or the second pipe 3 when the first flange 4 or the second flange 5 receives an external force. The strength that can damage the related equipment. The predetermined strength may be set in other manners, and the strength is lower than the strength that may cause unexpected load on the related equipment and damage the related equipment. It is also possible to select the material of the connector 9 and set the strength to the extent that it may be cut when the fitting operation of the joint 1 is completed.

  In addition, the allowable maximum distance between the first flange 4 and the second flange 5 is the maximum that the expansion / contraction flexible joint 1 can function without the first flange 4 and the second flange 5 being piped away from each other. Refers to the interval. In addition, when the distance between the first flange 4 and the second flange 5 is shorter than the maximum distance, the fact that the first flange 4 and the second flange 5 approach each other is a small external force. It may be bent by the external force at the time, or the first flange 4 and the second flange 5 may be bent flexibly like a string simply by approaching each other.

  Flange portions are formed at the ends of the first pipe 2 and the second pipe 3. The first pipe 2 and the first flange 4 are connected by a first bolt nut 12 made of a bolt and a nut, and the second pipe 3 and the second flange 5 are connected by a second bolt nut 13 made of a bolt and a nut. . The first sleeve 6 is integrally fixed to the first flange 4 by welding or the like, and the second sleeve 7 is similarly fixed to the second flange 5 by welding or the like.

  In the present embodiment, the end of the second sleeve 7 is configured such that the seal member 8 seals between the outer peripheral surface of the first sleeve 6 and the inner peripheral surface of the second sleeve 7 so as to be slidable with respect to each other. The seal member 8 is accommodated in a ring-shaped groove formed in the portion, and the outer peripheral surface of the first sleeve 6 slides relative to the seal member 8 accommodated in the groove. It is also possible to omit the groove portion for storing the seal member 8 and provide a protrusion as a stopper for the seal member 8 at the end portions of the first sleeve 6 and the second sleeve 7.

  As shown in FIG. 8, the connector 9 is made by processing, for example, an elongated metal plate. The connector 9 has an elongated portion 9a at the center and a hanging portion 9b at both ends of the elongated portion 9a. The hanging portion 9 has a length corresponding to the maximum allowable distance between the first flange 4 and the second flange 5. The hanging portion 9 has a hanging hole 9c, and is formed by press-bending an extended portion of the elongated portion 9a to about 90 degrees. The hook portion 9b is attached to one first bolt nut 12 of the first flange 4 and one second bolt nut 13 of the second flange 5 through the hook hole 9c. The connector 9 can be deformed when the distance d between the first bolt nut 12 and the second flange 5 changes due to an external force. By deforming, the first flange 4 and the second flange 9 are longer or shorter within an allowable range. The connection state with the flange 5 is maintained.

  Next, various positional relationships between the first flange 4 and the second flange 5 will be described. FIG. 2 shows the expansion / contraction flexible joint 1 when the distance d between the first flange 4 and the second flange 5 is in a standard state. FIG. 3 is an end view corresponding to FIG. 2 and 3, A view, B view, C view, and D view are views seen from A, B, C, and D, respectively. The distance d in the standard state refers to, for example, 200 mm assuming that the maximum distance allowed between the first flange 4 and the second flange 5 is about 200 mm and the minimum distance is 150 mm. The length of the elongated portion 9a of the connector 9 corresponds to the interval d in the standard state.

  As shown in FIG. 3, two connecting devices 9 are provided at left and right symmetrical positions. The two couplers 9a and 9b are individually deformed separately, so that the first flange 4 and the first flange 4 can be prevented from being relatively twisted or displaced between the first pipe 2 and the second pipe 3. The connection state with the 2 flange 5 can be stably maintained. A symbol P indicates a bending fulcrum between the first flange 4 and the second flange 5.

  The distance d in the standard state shown in FIG. 2 is, for example, 200 mm when assuming that the distance between the first flange 4 and the second flange 5 is about 200 mm and the maximum allowable distance is 250 mm and the minimum distance is 150 mm. I mean. When the expansion / contraction flexible joint 1 is attached to the end of the first pipe 2 and the end of the second pipe 3, the first pipe 2 and the second pipe 3 are positioned at the distance d in the standard state shown in FIG. Connecting with the connector 9 is performed.

  4 shows that the distance d between the first flange 4 and the second flange 5 is shortened when the first sleeve 6 and the second sleeve 7 are moved toward each other through the seal member 8 in response to an external force or the like. Accordingly, the connector 9 is deformed and bent by an external force.

  FIG. 5 shows a state in which the distance d between the first flange 4 and the second flange 5 is increased and the connector 9 is deformed by an external force and is tensioned without bending. The hook 9 of the connector 9 has a maximum allowable length. In this case, a part of the hook portion 9 of the connector 9 is added to both ends of the elongated portion 9a, and the interval d between the first flange 4 and the second flange 5 is the maximum allowable interval.

  In FIG. 6, the first flange 4 and the second flange 5 are rotated relative to the bending fulcrum P by an angle θ (for example, 3 degrees), and the connector 9 tilts the first flange and the second flange relative to each other. It shows that it connects in a state. The seal member 8 is self-deformed and can secure a sealing property between the first flange 4 and the second flange 5. It is possible to cope with rotation in an arbitrary direction by deforming the two right and left connecting tools 9a and 9b different from each other.

  FIG. 7 shows that the first flange and the second flange are offset from each other by a displacement s (for example, 8 mm), and the connector 9 connects the first flange and the second flange in a tensioned state without bending. Show.

  According to the configuration of the present embodiment, since the connecting tool 9 for connecting the first flange 4 and the second flange 5 is provided, the first flange 4 and the second flange 5 may be separated excessively unstable. The expansion / contraction flexible joint 1 can be attached between the first pipe 2 and the second pipe 3 by the first bolt nut 12, the second bolt nut 13, or the like while always maintaining a stable connection state.

  The connector 9 has a length that allows the first flange 4 and the second flange 5 to be connected to each other with the maximum distance between the first flange 2 and the second flange 3 being allowed. Cutting is possible when the first flange 4 and the second flange 5 receive an external force larger than a predetermined strength in a direction away from each other at a maximum interval in which the interval between the first flange 4 and the second flange 5 is allowed. Therefore, it is possible to disconnect the first pipe 2 or the second pipe 3 from the expansion / contraction flexible joint 1 by disconnecting the connection tool 9 itself, and the connection connected to the first pipe 2 or the second pipe 3. It is possible to prevent an unexpected load from being applied to the equipment.

  Note that the connecting tool 9 is not limited to a metal plate material as shown in FIG. 8, and the connecting tool 9 may be a wire or a non-metallic string.

  Moreover, although the connection tool 9 connects the 1st flange 4 and the 2nd flange 5, it replaces with connecting with the 1st flange 4 or the 2nd flange 5 directly, and indirectly through another member. Alternatively, it may be connected to the first flange 4 or the second flange 5.

  Next, an expansion / contraction flexible joint attachment method for attaching the expansion / contraction flexible joint 1 flexibly so that the end of the first pipe 2 and the end of the second pipe 3 can be extended and contracted will be described.

  A seal member 8 that seals the outer peripheral surface of the first sleeve 6 attached to the first flange 4 and the inner peripheral surface of the second sleeve 7 attached to the second flange 5 in a slidable manner. Arranged between the first sleeve 6 and the second sleeve 7.

  Next, the first flange 4 and the second flange 5 have a length that can be connected to a maximum interval in which the interval between them is allowed, and can be bent when the interval is shorter than the maximum interval, and the interval is the maximum interval. In FIG. 2, a connecting tool 8 that can be cut when the first flange 4 and the second flange 5 receive an external force of a predetermined strength or more in the direction away from each other is attached between the first flange 4 and the second flange 5.

  Next, the first flange 4 is attached to the first pipe 2, and the second flange 5 is attached to the second pipe 3.

  According to the present embodiment, since the connector 8 is utilized, there is no need to attach the expansion / contraction flexible joint 1 to the pipes while monitoring with a ruler as in the conventional case, and the first pipe 2 and the first pipe It is possible to easily and reliably attach the two pipes 3 without removing the pipes. Thereby, even if it is a case where the work environment which attaches the expansion-contraction flexible joint 1 to piping is inferior, attachment work can be performed without trouble.

DESCRIPTION OF SYMBOLS 1 Expansion / contraction flexible joint 2 1st piping 3 2nd piping 4 1st flange 5 2nd lunge 6 1st sleeve 7 2nd sleeve 8 Seal member 9 Connecting tool

Claims (7)

An expansion / contraction flexible joint that flexibly connects the end of the first pipe and the end of the second pipe in an extendable manner,
A first flange attached to the first pipe;
A first sleeve attached to the first flange;
A second flange attached to the second pipe;
A second sleeve attached to the second flange;
A seal member that seals between an outer peripheral surface of the first sleeve and an inner peripheral surface of the second sleeve so as to be slidable flexibly with each other;
The first flange and the second flange have a length that can be connected to a maximum distance in which a space between the first flange and the second flange is allowed. When the distance is shorter than the maximum distance, the first flange and the second flange can be bent. A connector that can be cut when the first flange and the second flange receive an external force greater than or equal to a predetermined strength in a distance from each other at an interval;
The expansion-contraction flexible joint characterized by comprising. The predetermined strength is a strength capable of giving an unexpected load force to related equipment connected to the first pipe or the second pipe when the first flange or the second flange receives an external force. The expansion / contraction flexible joint according to claim 1. The connector includes a first bolt and nut for attaching the first pipe to the first flange and a second bolt and nut for attaching the second pipe to the second flange, and the first flange and the second. The expansion / contraction flexible joint according to claim 1, wherein the expansion / contraction flexible joint is attached between the flange and the flange. The expansion / contraction flexible joint according to any one of claims 1 to 3, wherein two of the coupling tools are provided at positions facing each other. The expansion / contraction flexible joint according to any one of claims 1 to 4, wherein the connecting member is made of a plate material and is formed by press-bending both ends. The expansion / contraction flexible joint according to any one of claims 1 to 4, wherein the connector is formed in a string body. An expansion / contraction flexible joint mounting method for flexibly attaching an expansion / contraction flexible joint to an end of the first piping and an end of the second piping,
A seal member that seals the first sleeve and the second sleeve in a flexible and slidable manner between the outer peripheral surface of the first sleeve attached to the first flange and the inner peripheral surface of the second sleeve attached to the second flange. Between the two sleeves,
The first flange and the second flange have a length that can be connected to a maximum distance in which a space between the first flange and the second flange is allowed. When the distance is shorter than the maximum distance, the first flange and the second flange can be bent. Attach between the first flange and the second flange a coupler that can be cut when the first flange and the second flange receive an external force greater than or equal to a predetermined strength in the distance from each other;
A first flange is attached to the first pipe,
A method for attaching an expansion / contraction flexible joint, wherein a second flange is attached to the second pipe.

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