JP6832119B2 - Pipe joint structure and pipe joining method - Google Patents

Description

The present invention relates to a pipe body joint structure and a pipe body joining method.

Conventionally, a joint structure of a pipe body as described in Patent Document 1 below has been known. This joint structure comprises a receiving tube having a socket, an insertion tube having an insertion port inserted into the socket, and a lock ring arranged between the inner peripheral surface of the socket and the outer peripheral surface of the insertion port. I have. The lock ring is a ring divided at one position in the circumferential direction, and is housed in a lock ring accommodating groove formed on the inner peripheral surface of the receiving port. The lock ring is locked to the insertion protrusion formed on the outer peripheral surface of the insertion opening to prevent the insertion opening from being separated from the receiving port.

Japanese Unexamined Patent Publication No. 2003-287168

However, in the joint structure of the conventional pipe body, there is a problem that a load is applied to the lock ring because the lock ring is deformed in order to increase the diameter when the insertion port is inserted into the receiving port. When a load is applied to the lock ring, for example, the lock ring is easily damaged. If the lock ring is damaged, the insertion slot may come off from the socket.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to suppress a load on a member when the insertion port is inserted into a receiving port.

In order to solve the above problems, the present invention proposes the following means.
The joint structure of the pipe body according to the present invention relates to a receiving pipe body having a receiving port provided with an outer recess on the inner peripheral surface, an insertion pipe body having an insertion port inserted into the receiving port, and the outer recess. , A plurality of locking pieces located inside the receiving tube in the radial direction and arranged between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port along the circumferential direction of the receiving tube. Of the side wall surfaces of the outer recess, the locking piece is formed by a side wall surface located on the first side of the outer recess, which is the pipe end side of the receiving port along the axial direction of the receiving tube. A first locking portion that locks from the first side and a second locking piece that is provided at the insertion port and is opposite to the first side along the axial direction. The second locking portion and the first region facing the locking piece on the bottom wall surface of the outer recess are provided, and the locking piece connects the first locking portion and the second locking portion in the axial direction. and a regulating member for regulating that overcome, the said first region, a second region opposed to the locking piece in the outer peripheral surface of the insert opening, the distance along the radial direction between, When the size of the locking piece is larger than the radial size and the locking piece is brought into contact with the first region, the locking piece is larger than the second locking portion at the insertion port. Of the side wall surfaces of the outer recess, which is located outside the radial direction of the outer peripheral surface of the pipe end side portion located on the second side, the side wall surface located on the second side with respect to the outer recess is , Located on the second side of the second locking portion .

In this case, for example, when an earthquake occurs or the internal pressure of each pipe body rises, a pull-out force acts along the axial direction between the receiving pipe body and the insertion pipe body, and the insertion port tries to separate from the receiving port. At that time, the first locking portion of the receiving port and the second locking portion of the insertion port are locked to the locking piece from opposite sides in the axial direction. This regulates the unexpected withdrawal of the insertion port from the socket.
In this joint structure, when the locking piece is brought into contact with the first region, the locking piece is located radially outside the outer peripheral surface of the pipe end side portion of the insertion port. Therefore, when joining the receiving tube body and the insertion tube body adopted in this joint structure, for example, before inserting the insertion port into the receiving port, for example, the locking piece is engaged so as to abut on the inner peripheral surface of the receiving port. Temporarily fix the piece to the inner peripheral surface of the socket. As a result, the insertion port can be smoothly inserted into the receiving port without causing the locking piece to interfere with the outer peripheral surface of the tube end side portion of the insertion port. After that, by releasing the temporary fixing, the locking piece can be locked to the first locking portion and the second locking portion.
As described above, when the insertion port is inserted into the receiving port, the connection between the insertion port and the receiving port is maintained while maintaining the reliability of the locking piece without applying a load due to the deformation of the locking piece to the locking piece. Workability can be ensured. Further, even if it becomes necessary to separate the insertion port from the receiving port due to, for example, re-construction, for example, the receiving tube body and the insertion tube body are temporarily fixed to the inner peripheral surface of the receiving port. By moving and relatively apart in the axial direction, the insertion port can be smoothly separated from the receiving port.

An elastic seal portion provided on the inner peripheral surface of the socket on the second side of the locking piece and in contact with the outer peripheral surface of the insertion port may be further provided.

In this case, the elastic seal portion is provided on the inner peripheral surface of the receiving port on the second side of the locking piece. Therefore, when the insertion port is inserted into the receiving port, it is not necessary for the locking piece and the elastic seal portion to get over in the axial direction, and it is possible to prevent an excessive load from being applied to the elastic seal portion.

The receiving tube body and the insertion tube body may be made of resin.

In this case, since the receiving tube body and the inserting tube body are made of resin (for example, FRPM tube or FRP tube), both tubes can be easily deformed and bent. Moreover, since a plurality of locking pieces are arranged along the circumferential direction, it is possible to increase the degree of freedom of the bending angle of the joint structure as compared with the case where the locking pieces extend continuously over the entire circumference, for example. it can. That is, when a predetermined bending angle is expected for the joint structure, the locking pieces are deformed according to the bending angle so that a sufficient clearance is secured between the plurality of locking pieces. The position of can be adjusted at the design stage.

A positioning portion provided on at least one of the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port and fixing the position of the locking piece along the circumferential direction of the receiving tube body may be further provided.

In this case, since the joint structure includes a positioning portion, it is possible to suppress unexpected movement of the locking piece in the circumferential direction, and the locking piece can be moved to the first locking portion and the second locking portion. Can be securely locked.

The method for joining the pipe body according to the present invention is a method for joining the receiving pipe body and the insertion pipe body adopted in the joint structure of the pipe body, and the locking piece is used as the receiving port. After the insertion step of inserting the insertion port into the socket and the insertion step in a state of being temporarily fixed to the inner peripheral surface of the above, the temporary fixing is released and the locking piece is attached to the first locking portion and the first locking portion. It includes a locking step of locking the second locking portion.

In this case, the insertion step and the locking step are performed to join the two pipe bodies. Therefore, when the insertion port is inserted into the socket, the connection between the insertion port and the socket is maintained while maintaining the reliability of the locking piece without applying a load due to the deformation of the locking piece to the locking piece. Workability can be ensured.

During the insertion step, the locking piece is temporarily fixed by attaching a fall-out prevention jig to the socket, and in the locking step, the drop-out prevention jig is detached from the socket to release the temporary fixing. A detachment step may be included.

In this case, during the insertion step, the locking piece is temporarily fixed by attaching a fall-out prevention jig to the socket, and during the release step, the drop-off prevention jig is detached from the socket to release the temporary fixing. In this way, the locking piece can be temporarily fixed and released by simply attaching and detaching the falling prevention jig to the receiving port. Moreover, since the receiving port is located on the outer side in the radial direction with respect to the insertion port, the workability when attaching / detaching the falling-out prevention jig to / from the receiving port is higher than that when attaching / detaching the falling-out prevention jig to / from the insertion port, for example. high. Therefore, the workability of joining can be further ensured.

According to the present invention, it is possible to suppress a load on the member when the insertion port is inserted into the receiving port.

It is a side view which shows the joint structure of the pipe body which concerns on one Embodiment of this invention. It is a vertical cross-sectional view of the joint structure of the pipe body shown in FIG. It is an enlarged vertical sectional view of the main part of the joint structure of the pipe body shown in FIG. It is a cross-sectional view of the joint structure of the pipe body shown in FIG. It is an enlarged cross-sectional view of the main part (inside the alternate long and short dash line) of the joint structure of the pipe body shown in FIG. It is a side view explaining the insertion process of the joining method of the pipe body which joins the receiving pipe body and the insertion pipe body adopted in the joint structure of the pipe body shown in FIG. It is a vertical cross-sectional view explaining the insertion process shown in FIG. It is an enlarged vertical sectional view of the main part explaining the insertion process shown in FIG. 7. It is a perspective view of the drop-out prevention jig used in the insertion process shown in FIG. FIG. 6 is a cross-sectional view of a socket and an insertion slot showing a state in which the locking piece is temporarily fixed in the insertion step shown in FIG. It is a figure which shows the joint structure of the pipe body which concerns on the 1st modification of this invention, and is the enlarged vertical sectional view which corresponds to FIG. It is a figure which shows the joint structure of the pipe body which concerns on the 2nd modification of this invention, and is the enlarged vertical sectional view which corresponds to FIG. It is a figure which shows the joint structure of the pipe body which concerns on the 3rd modification of this invention, and is the enlarged vertical sectional view which corresponds to FIG.

Hereinafter, the joint structure of the pipe body according to the embodiment of the present invention will be described with reference to FIGS. 1 to 10. As shown in FIGS. 1 to 5, the joint structure 10 of the pipe body includes the receiving pipe body 11, the insertion pipe body 12, the locking piece 13, the first locking portion 14, and the second locking portion 15. A regulating member 16 and a positioning unit 17 are provided. The receiving tube body 11 and the inserting tube body 12 are made of resin, and are, for example, FRPM tubes and FRP tubes.

As shown in FIGS. 1 and 2, the receiving tube body 11 includes a receiving port 21. The receiving tube body 11 is formed by two tube bodies. The receiving tube body 11 includes a main body tube 22 and a mouth tube 23. The axes of the main body tube 22 and the mouth tube 23 are both arranged on a common axis. This common axis is the axis of the receiving tube body 11 (hereinafter, simply referred to as “axis O”). In the following, the direction orthogonal to the axis O is referred to as the radial direction, and the direction orbiting around the axis O is referred to as the circumferential direction.

The mouth pipe 23 is fitted to the end of the main body pipe 22 in the axial direction O direction from the outside in the radial direction. The mouth tube 23 forms the receiving port 21 of the receiving tube body 11. In the following, the end side (the pipe end side of the receiving port 21) of the main body pipe 22 into which the mouth pipe 23 is fitted is referred to as the first side S1 along the axis O direction, and the mouth pipe 23 is not fitted. The end side (opposite side of the first side S1) of the main body tube 22 is referred to as the second side S2.

The insertion tube body 12 is formed by one tube body. The insertion tube body 12 is arranged coaxially with the receiving tube body 11. The insertion tube body 12 includes an insertion port 24 inserted into the receiving port 21. The insertion port 24 is an end portion of the second side S2 in the insertion tube body 12. The insertion port 24 is inserted into the receiving port 21 from the first side S1.

The mouth tube 23 is provided with a stopper rubber 25 and a mouthpiece seal rubber 26.
The stopper rubber 25 is arranged at the center of the mouth tube 23 in the axis O direction. The stopper rubber 25 extends all around the inner peripheral surface of the mouth tube 23. The stopper rubber 25 is formed in an annular shape coaxial with the axis O. The inner diameter of the stopper rubber 25 is the same as the inner diameter of the main body pipe 22 and the insertion pipe body 12 of the receiving pipe body 11. The stopper rubber 25 is sandwiched in the axis O direction by the main body tube 22 and the insertion tube body 12.

The receiving port seal rubber 26 is arranged on both sides of the mouth tube 23 with the stopper rubber 25 sandwiched in the axis O direction. The socket seal rubber 26 is arranged on the inner peripheral surface of the mouth tube 23 over the entire circumference. The socket seal rubber 26 is formed in an annular shape coaxial with the axis O. Of the pair of socket seal rubbers 26, the first seal 26a (elastic seal portion) located on the first side S1 abuts on the outer peripheral surface of the insertion port 24 of the insertion tube body 12 and is located on the second side S2. The 2 seal 26b is in contact with the outer peripheral surface of the main body tube 22 of the receiving tube body 11.

As shown in FIGS. 3 and 5, the receiving port 21 is provided with an outer recess 27. The outer recess 27 is arranged on the first side S1 of the receiving port 21 with respect to the first seal 26a. The outer recess 27 extends over the entire circumference of the inner peripheral surface of the receiving port 21.
The insertion port 24 is provided with an inner recess 28. The inner recess 28 is arranged at a position that faces the outer recess 27 in the radial direction at the insertion port 24. The inner recess 28 is smaller in the axis O direction than the outer recess 27. A plurality of inner recesses 28 are arranged on the outer peripheral surface of the insertion port 24 at intervals in the circumferential direction.

As shown in FIG. 4, a plurality of inner recesses 28 are arranged so as to sandwich the axis O in a cross-sectional view orthogonal to the axis O. In the present embodiment, a plurality of inner recesses 28 are arranged in each of the pipe top portion 24a and the pipe bottom portion 24b of the insertion port 24, and are not arranged in the pipe side portion 24c. The pipe top portion 24a and the pipe bottom portion 24b of the insertion port 24 are arranged regions R1 in which the inner recess 28 is arranged, and the pipe side portion 24c is a non-arranged region R2 in which the inner recess 28 is not arranged. The arrangement area R1 and the non-arrangement area R2 are alternately provided in the circumferential direction. The size of the arrangement area R1 in the circumferential direction is smaller than the size of the non-arrangement area R2 in the circumferential direction.

The outer recess 27 and the inner recess 28 are formed, for example, by laminating (for example, laminating an FRP material or the like) a portion of the mouth pipe 23 or the insertion tube body 12 where the outer recess 27 or the inner recess 28 is not formed. May be good. Further, the outer recess 27 and the inner recess 28 are made of materials (hard resin, FRP, FRPM, elastic body (for example, hard rubber, etc.)) on the outer peripheral surface of the preformed pipe material where the outer recess 27 and the inner recess 28 are not formed. )) May be formed by adhering.

As shown in FIGS. 3 to 5, a plurality of locking pieces 13 are arranged along the circumferential direction between the inner peripheral surface of the receiving port 21 and the outer peripheral surface of the insertion port 24. The locking piece 13 is located on the first side S1 of the first seal 26a. The locking piece 13 is formed in a spherical shape. The locking piece 13 is arranged in the inner recess 28. As a result, the locking piece 13 is arranged in the arrangement area R1 and not in the non-arrangement area R2.

As shown in FIG. 3, the radial direction between the first region 13a facing the locking piece 13 on the inner peripheral surface of the receiving port 21 and the second region 13b facing the locking piece 13 on the outer peripheral surface of the insertion port 24. The distance D0 along is larger than the radial size D1 of the locking piece 13. In the present embodiment, the first region 13a is formed by the bottom wall surface of the outer recess 27, and the second region 13b is formed by the bottom wall surface of the inner recess 28.

The first locking portion 14 is provided in the receiving port 21. The first locking portion 14 locks to the locking piece 13 from the first side S1. The first locking portion 14 is formed by the side wall surface of the outer recess 27. The first locking portion 14 is formed by a side wall surface of the side wall surface that is located on the first side S1 with respect to the outer recess 27 and faces the second side S2.

The second locking portion 15 is provided at the insertion port 24. The second locking portion 15 locks to the locking piece 13 from the second side S2. The second locking portion 15 is formed by the side wall surface of the inner recess 28. The second locking portion 15 is formed by a side wall surface of the side wall surface that is located on the second side S2 with respect to the inner recess 28 and faces the first side S1. The second locking portion 15 faces the bottom wall surface of the outer recess 27 from the inside in the radial direction.

The regulating member 16 is provided in the first region 13a. The regulating member 16 faces the locking piece 13 in the radial direction, and restricts the locking piece 13 from getting over the first locking portion 14 and the second locking portion 15 in the axis O direction. The regulating member 16 can prevent the locking piece 13 from unexpectedly detaching from the first locking portion 14 and the second locking portion 15.
The regulating member 16 is formed in a plate shape with the front and back surfaces facing in the radial direction, and is fixed to the inner peripheral surface of the receiving port 21. The regulating member 16 is fixed to the bottom wall surface (first region 13a) of the outer recess 27. The regulating member 16 is fixed to the bottom wall surface by, for example, bonding. The regulating member 16 narrows the gap between the first region 13a and the second region 13b in the radial direction.

In a state where the receiving tube body 11 and the inserting tube body 12 are arranged coaxially, the radial size D1 of the locking piece 13 is along the radial direction between the regulating member 16 and the second locking portion 15. Although it is larger than the distance D2, it is smaller than the distance D3 along the radial direction between the bottom wall surface (first region 13a) of the outer recess 27 and the second locking portion 15. Therefore, if the restricting member 16 is not fixed to the bottom wall surface, the locking piece 13 gets over the second locking portion 15 over the second side S2, but the overcoming is restricted by the restricting member 16. ..

As shown in FIG. 5, the positioning portion 17 is provided on at least one of the inner peripheral surface of the receiving port 21 and the outer peripheral surface of the insertion port 24. In the present embodiment, the positioning portion 17 is provided only on the outer peripheral surface of the insertion port 24. The positioning unit 17 fixes the position of the locking piece 13 along the circumferential direction. The second locking portion 15 is formed by the side wall surface of the inner recess 28. The second locking portion 15 is formed by a pair of side wall surfaces facing in the circumferential direction among the side wall surfaces. The positioning portion 17 makes it possible to suppress unexpected movement of the locking piece 13 in the circumferential direction, and securely locks the locking piece 13 to the first locking portion 14 and the second locking portion 15. Can be made to.

In the joint structure 10 of the pipe body, for example, when an earthquake occurs or the internal pressure of each pipe body rises, a pulling force acts along the axis O direction between the receiving pipe body 11 and the insertion pipe body 12. When the insertion port 24 tries to separate from the receiving port 21, the first locking portion 14 of the receiving port 21 and the second locking portion 15 of the insertion port 24 are locked pieces 13 from opposite sides in the O-direction of the axis. Lock to. As a result, the unexpected disconnection of the insertion port 24 from the receiving port 21 is restricted.

Next, with reference to FIGS. 6 to 10, a method of joining the pipe body for joining the receiving pipe body 11 and the insertion pipe body 12 adopted in the joint structure 10 of the pipe body will be described.

The main body tube 22 is inserted into the mouth tube 23, and a forming step of forming the receiving tube body 11 is carried out.
This forming step can be carried out, for example, in a factory. Each step carried out after the forming step is mainly carried out at the construction site.

A temporary fixing step of temporarily fixing the locking piece 13 to the inner peripheral surface of the receiving port 21 is performed. At this time, in the present embodiment, as shown in FIGS. 6 to 8, the locking piece 13 is temporarily fixed by attaching the dropout prevention jig 40 to the receiving port 21. The dropout prevention jig 40 is detachably attached to the pipe end of the receiving port 21. As shown in FIGS. 8 and 9, the dropout prevention jig 40 includes an outer surface portion 41, an end surface portion 42, and an inner surface portion 43.

The outer surface portion 41 is arranged on the outer peripheral surface of the receiving port 21. The outer surface portion 41 is formed in a plate shape in which the front and back surfaces face in the radial direction.
The end face portion 42 is arranged on the open end face of the receiving port 21. The end surface portion 42 extends inward in the radial direction from the end portion of the first side S1 on the outer surface portion 41. The end face portion 42 is formed in a plate shape in which the front and back surfaces face the axis O direction.
The inner surface portion 43 is arranged on the inner peripheral surface of the receiving port 21. The inner surface portion 43 extends from the inner end portion in the radial direction of the end surface portion 42 toward the second side S2. The inner surface portion 43 includes a pair of leg portions 44 arranged at intervals in the circumferential direction.

With the fall-out prevention jig 40 attached to the pipe end of the receiving port 21, the inner surface portion 43 supports the locking piece 13 from the inside in the radial direction. As shown in FIG. 10, the pair of legs 44 support two places of the locking piece 13 that are spaced apart from each other in the circumferential direction. In the present embodiment, since the locking piece 13 is formed in a spherical shape, the radial inner edge of the locking piece 13 (hereinafter, referred to as “inner edge”) is between the pair of legs 44. It protrudes inward in the radial direction from. Further, when the temporary fixing step is carried out, the regulating member 16 is not fixed to the mouth pipe 23, and the radial outer edge of the locking piece 13 (hereinafter, referred to as “outer edge”) is , It is in contact with the bottom wall surface (first region 13a) of the outer recess 27.

Here, in the present embodiment, when the locking piece 13 is brought into contact with the first region 13a, the locking piece 13 is located at the tube end located on the second side S2 of the second locking portion 15 at the insertion port 24. It is located on the outer side in the radial direction from the outer peripheral surface of the side portion 24d. An annular row 45 of the locking pieces 13 is formed in the receiving port 21 to which the locking pieces 13 are temporarily fixed. The annular row 45 is formed by arranging a plurality of locking pieces 13 in the circumferential direction. The annular row 45 is arranged coaxially with the axis O. The inner diameter of the annular row 45 is equal to or larger than the outer diameter of the pipe end side portion 24d of the insertion port 24.

Next, as shown in FIGS. 6 and 7, an insertion step of inserting the insertion port 24 into the receiving port 21 is performed in a state where the locking piece 13 is temporarily fixed to the inner peripheral surface of the receiving port 21. In the insertion step, the insertion port 24 is inserted into the receiving port 21 until the pipe end of the insertion port 24 abuts on the stopper rubber 25. At this time, by attaching the fall-out prevention jig 40 to the receiving port 21 and temporarily fixing the locking piece 13, the locking piece 13 is brought into contact with (or close to) the first region 13a of the receiving port 21. As a result, in the present embodiment, the locking piece 13 is located outside the outer peripheral surface of the pipe end side portion 24d of the insertion port 24 in the radial direction, and the inner diameter of the annular row 45 is the outer diameter of the pipe end side portion 24d. As described above, when the insertion port 24 is inserted into the receiving port 21, the locking piece 13 (annular row 45) and the outer peripheral surface of the insertion port 24 are prevented from interfering with each other.

After the insertion step, the temporary fixing of the locking piece 13 is released, and the locking step of locking the locking piece 13 to the first locking portion 14 and the second locking portion 15 is performed. The locking step includes a detaching step and a fixing step.
In the detaching step, the dropout prevention jig 40 is detached from the receiving port 21 to release the temporary fixing. In the detaching step, the dropout prevention jig 40 is pulled out from the receiving port 21 to the first side S1. Then, the support of the locking piece 13 by the inner surface portion 43 is released. At this time, the locking piece 13 located at the top portion 24a of the pipe (the locking piece 13 located vertically above the insertion port 24) falls due to its own weight and is arranged in the inner recess 28. As a result, the locking piece 13 can be locked to the second locking portion 15. Further, the position of the locking piece 13 in the circumferential direction is fixed in the inner recess 28 by the positioning portion 17. Further, the outer edge of the locking piece 13 can be locked to the first locking portion 14 from the second side S2.

In the fixing step, the regulating member 16 is fixed to the inner peripheral surface of the receiving port 21. The locking piece 13 located at the bottom of the pipe 24b (the locking piece 13 located vertically below the insertion port 24) has a regulating member 16 fixed to the bottom wall surface (first region 13a) of the outer recess 27. Then, it is supported by the regulating member 16 from below. As a result, the outer edge of the locking piece 13 is arranged in the inner recess 28 so that the locking piece 13 can be locked to the second locking portion 15, and the position of the locking piece 13 in the circumferential direction is positioned. It is fixed by the part 17.
As described above, the receiving tube body 11 and the inserting tube body 12 are joined.

Here, even if it becomes necessary to separate the insertion port 24 from the receiving port 21 due to, for example, re-construction, for example, each locking piece 13 is temporarily fixed to the receiving port 21 and inserted into the receiving tube body 11. By moving the tube body 12 relative to the axis O direction, the insertion port 24 can be smoothly separated from the receiving port 21.

In the present embodiment, the regulating member 16 is detached from the receiving port 21 before the insertion port 24 is detached from the receiving port 21. At this time, for example, by inserting a detaching jig such as a hook into the receiving port 21 from the first side S1 and applying an external force to the regulating member 16 via the detaching jig, the regulating member 16 is forcibly pulled from the receiving port 21. It can be peeled off. Further, a hole, a notch, or the like may be formed in the regulating member 16 in advance, and an external force may be transmitted from the detaching jig to the regulating member 16 by using the hole or the notch.

As described above, according to the joint structure 10 of the pipe body and the method of joining the pipe body according to the present embodiment, the locking piece 13 is inserted into the insertion port 24 by performing the temporary fixing step before the insertion step. The insertion step can be smoothly carried out without interfering with the outer peripheral surface of the pipe end side portion 24d. After that, by carrying out the locking step, the locking piece 13 can be locked to the first locking portion 14 and the second locking portion 15.
From the above, when the insertion port 24 is inserted into the receiving port 21, the insertion port is maintained while maintaining the reliability of the locking piece 13 without applying a load due to the deformation of the locking piece 13 to the locking piece 13. The workability of joining the 24 and the receiving port 21 can be ensured.

During the insertion step, the locking piece 13 is temporarily fixed by attaching the dropout prevention jig 40 to the socket 21, and during the release step, the dropout prevention jig 40 is detached from the socket 21 to release the temporary fixing. In this way, the locking piece 13 can be temporarily fixed and released by simply attaching and detaching the falling prevention jig 40 to the receiving port 21. Moreover, since the receiving port 21 is located on the outer side in the radial direction with respect to the insertion port 24, the workability when attaching / detaching the falling-out prevention jig 40 to the receiving port 21 is, for example, the dropping-out prevention jig 40 at the insertion port 24. It is more expensive than when it is attached and detached. Therefore, the workability of joining can be further ensured.

The first seal 26a is provided on the inner peripheral surface of the receiving port 21 on the second side S2 of the locking piece 13. Therefore, when the insertion port 24 is inserted into the receiving port 21, it is not necessary for the locking piece 13 and the first seal 26a to get over in the axis O direction, and it is possible to prevent an excessive load from being applied to the first seal 26a. it can.

Since the receiving tube 11 and the inserting tube 12 are made of resin, both tubes can be easily deformed and bent. Moreover, since a plurality of locking pieces 13 are arranged along the circumferential direction, for example, the degree of freedom of the bending angle of the joint structure 10 is increased as compared with the case where the locking pieces 13 extend continuously over the entire circumference. Can be enhanced. That is, when a predetermined bending angle is expected for the joint structure 10, a sufficient clearance is secured between the plurality of locking pieces 13 in the joint structure 10 deformed according to the bending angle. The position of the locking piece 13 can be adjusted at the design stage. For example, in the present embodiment, the pipe side portion 24c is a non-arranged region R2 in which the locking piece 13 is not arranged, and the degree of freedom of the bending angle of the joint structure 10 in the horizontal direction can be increased. ..

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The regulating member 16 may be fixed to the receiving port 21 by a method other than adhesion. For example, as in the joint structure 50 of the pipe body shown in FIG. 11, the regulation member 16 may be fixed to the receiving port 21 by a fastening member 51 such as a screw or a bolt. In this case, when the regulating member 16 is separated from the receiving port 21, the fastening by the fastening member 51 may be released.

As the locking piece 13, a form different from the above-described embodiment can be appropriately adopted. For example, as in the joint structure 60 of the pipe body shown in FIG. 12, two locking pieces 13 may be arranged side by side in the axis O direction, and the two locking pieces 13 may be connected to each other. Further, as in the joint structure 70 of the pipe body shown in FIG. 13, the locking piece 13 may be formed in a rectangular parallelepiped shape instead of a spherical shape.

In the above embodiment, the locking piece 13 is arranged between the inner peripheral surface of the mouth tube 23 and the outer peripheral surface of the insertion tube body 12. The present invention is not limited to this, and a locking piece is used in place of or separately from the locking piece 13 between the inner peripheral surface of the mouth tube 23 and the outer peripheral surface of the main body tube 22. It is also possible to place. In this case, the mouth tube 23 (receiving tube body 11) may be provided with the first locking portion, and the main body tube 22 (inserting tube body 12) may be provided with the second locking portion. Then, when the main body tube 22 is inserted into the mouth tube 23, the main body tube 22 is inserted into the mouth tube 23 with the locking piece temporarily fixed to the inner peripheral surface of the mouth tube 23 (the insertion step is performed). After that), the temporary fixing can be released to lock the locking piece to the first locking portion and the second locking portion (the locking step is carried out).

In addition, it is possible to replace the constituent elements in the embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

10, 50, 60, 70 Pipe joint structure 11 Receiving pipe body 12 Inserting pipe body 13 Locking piece 13a First area 13b Second area 14 First locking part 15 Second locking part 16 Restricting member 17 Positioning part 21 Receptacle 24 Insertion port 26a 1st seal (elastic seal part)
40 Falling prevention jig O Axis line S1 1st side S2 2nd side

Claims (6)

A receiving tube body having a receiving port provided with an outer recess on the inner peripheral surface,
An insertion tube body having an insertion port inserted into the socket,
A plurality of portions are arranged along the circumferential direction of the receiving tube body between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port , which are located inside the receiving tube body in the radial direction with respect to the outer recess. With the locked piece
Of the side wall surfaces of the outer recess, the outer recess is formed by a side wall surface located on the first side of the receiving tube end side along the axial direction of the receiving tube body, and is formed on the locking piece . a first locking portion for locking from said first side,
A second locking portion provided at the insertion port and locked to the locking piece from the second side opposite to the first side along the axial direction.
A regulation provided on the bottom wall surface of the outer recess in a first region facing the locking piece, and restricting the locking piece from overcoming the first locking portion and the second locking portion in the axial direction. With parts ,
Said first region, the distance along said radial direction between the second region facing the locking piece in the outer peripheral surface of the insert opening, is larger than the size in the radial direction of the locking piece ,
When the locking piece is brought into contact with the first region, the locking piece is from the outer peripheral surface of the pipe end side portion located on the second side of the second locking portion at the insertion port. also, located outside in the radial direction,
Of the side wall surfaces of the outer recess, the side wall surface located on the second side with respect to the outer recess is a joint structure of a pipe body located on the second side of the second locking portion. The joint structure of a pipe body according to claim 1, further comprising an elastic seal portion provided on the inner peripheral surface of the receiving port on the second side of the locking piece and in contact with the outer peripheral surface of the insertion port. The joint structure of the pipe body according to claim 1 or 2, wherein the receiving pipe body and the insertion pipe body are made of resin. 1. Claim 1 further provided with a positioning portion provided on at least one of the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port and fixing the position of the locking piece along the circumferential direction of the receiving tube body. The joint structure of the pipe body according to any one of 3 to 3. A method for joining a pipe body for joining the receiving pipe body and the insertion pipe body, which is adopted in the joint structure of the pipe body according to any one of claims 1 to 4.
An insertion step of inserting the insertion slot into the socket while the locking piece is temporarily fixed to the inner peripheral surface of the socket.
A method for joining a pipe body, comprising: after the insertion step, a locking step of releasing the temporary fixing and locking the locking piece to the first locking portion and the second locking portion. During the insertion step, the locking piece is temporarily fixed by attaching a fall prevention jig to the socket.
The method for joining a pipe body according to claim 5 , wherein the locking step includes a detaching step of detaching the falling prevention jig from the receiving port to release the temporary fixing.

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