JP2013148217A - Pipe joint, pipe joint member, method of manufacturing pipe joint, and pipe connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously integrate a joint body and a short pipe part in a manufacturing plant, so that installation is facilitated and reliability for disengagement prevention and a water stop can be enhanced.SOLUTION: A pipe joint includes a steel joint body and a synthetic resin short pipe part 14, and they are previously integrated and formed. Between a socket 22 inner surface of the joint body and a one end 34 outer surface of the short pipe part 14, a water stop rubber ring 40 is mounted. Further, a locking part 28 is formed on the socket 22 inner surface, and a disengagement prevention part 36 is formed at a position on a socket 22 depth side than the locking part 28, on one end 36 of the short pipe part 14. The disengagement prevention part 36 prevents disengagement of the short pipe part 14 from the socket 22 by being locked to the locking part 28, when force is applied to the short pipe part 14 in a coming-off direction.

Description

  TECHNICAL FIELD The present invention relates to a pipe joint, a pipe joint member, a pipe joint manufacturing method, and a pipe connection structure, and particularly includes, for example, a steel joint main body and used for connecting a rigid polyvinyl chloride pipe. The present invention relates to a member, a method for manufacturing a pipe joint, and a pipe connection structure.

  Steel plate deformed pipes are known as medium and large diameter pipe joints for connecting rigid polyvinyl chloride pipes used for agricultural water and the like. For example, Non-Patent Document 1 describes a conventional modified tube made of T-shaped steel plate and a modified tube made of M-shaped steel plate.

  As shown in FIG. 12, the conventional deformed pipe 100 made of a T-shaped steel plate includes a water stop rubber ring 2 attached to the inner surface of the receiving port 1. In the conventional deformed pipe 100 made of T-shaped steel plate, when the insertion port 3 of the hard polyvinyl chloride pipe is inserted into the receiving port 1, the water stop rubber ring 2 is compressed between the inner surface of the receiving port 1 and the outer surface of the inserting port 3. As a result, the water tightness of the connecting portion is ensured.

Further, as shown in FIG. 13, a conventional deformed pipe 102 made of M-shaped steel plate has a water stop rubber ring mounted between the inner surface of the receiving port 1 and the outer surface of the insertion port 3 at the tube end portion of the receiving port 1. 2 is provided. In the conventional deformed pipe 102 made of an M-shaped steel plate, the rigid polyvinyl chloride pipe outlet 3 is inserted into the receptacle 1 up to the vicinity of the stopper 4, and then the press ring 7 is fixed to the water stop rubber using the T-head bolt 5 and the nut 6. By pressing against the outer end surface of the ring 2 and compressing and deforming the water-stopping rubber ring 2, the water-tightness of the connecting portion is ensured by bringing the water-stopping rubber ring 2 into close contact with the inner surface of the receiving port 1 and the outer surface of the insertion port 3 with a certain water-stopping surface pressure .
Kubota Vinyl Pipe (for agricultural water) Catalog No.101-02 95.9.10. IN.REX. P30-43 Kubota Corporation

  Since a force in the pulling direction acts on the connecting portion of the deformed pipe having a bent portion or a branching portion due to the internal pressure, it is necessary to provide thrust protection for preventing the connected pipe from being detached. As the thrust protection, for example, a method in which a portion to which a thrust load is applied is protected by a concrete block, or a separation preventing metal fitting is attached to a connection portion is used. However, it takes labor and time to place a concrete block and to attach a separation prevention metal fitting, and it also requires parts costs and the construction cost increases. Further, when the thrust protection work is performed at the construction site, there is a problem that the state of the thrust protection is likely to vary depending on the skill of the operator and the like, and it is not reliable whether it can be surely prevented from being detached.

  Therefore, the main object of the present invention is to provide a novel pipe joint, pipe joint member, pipe joint manufacturing method, and pipe connection structure.

  Another object of the present invention is to provide a pipe joint, a pipe joint member, a method for manufacturing a pipe joint, and a pipe connection structure that are highly reliable for retaining and have excellent workability.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses and supplementary explanations indicate correspondence with embodiments described later in order to help understanding of the present invention, and do not limit the present invention.

  1st invention is a steel joint main body which has a receptacle, the short pipe part by which one end part was inserted in the receptacle, and the rubber | gum for water stop attached between the receptacle inner surface and one end outer surface The joint body has a locking portion formed on the inner surface of the receiving port, and the short tube portion is formed at a position on the back side of the receiving port with respect to the locking portion at one end portion, and the force in the removal direction It is a pipe joint which has the detachment prevention part which is latched by the latching part and prevents the detachment of the short pipe part when is operated.

  In the first invention, in the pipe joint (10), one end part (34) of the short pipe part (14) is fitted into the receiving port (22) of the steel joint main body (12), and both are integrated. For example, it is used to connect a rigid polyvinyl chloride pipe used for agricultural water. The water stop rubber rings (40, 72) are mounted between the inner surface of the joint body and the outer surface of one end of the short pipe portion to ensure the water stop of the mouth portion. Further, a locking portion (28) is formed on the inner surface of the receiving port, and a separation preventing portion (36) is formed at one end of the short tube portion at a position on the back side of the receiving port with respect to the locking portion. . The detachment preventing portion is locked by the locking portion to prevent the detachment of the short tube portion from the receiving port when a pulling force is applied to the short tube portion.

  According to the first invention, since the joint main body and the short pipe portion are integrated in advance at the manufacturing factory, the connection between the joint main body and the short pipe portion can be performed with a certain quality, and the separation prevention and water stoppage can be performed. Can improve the reliability. Moreover, since it is not necessary to connect a joint main body and a short pipe part at the construction site, it is excellent in workability and can shorten working time.

  The second invention is dependent on the first invention, and the locking portion is integrally formed with the receiving port in advance.

  In the second invention, the locking portion (28) is fitted into the receiving ports (22, 26) in advance, that is, the one end portion (34) of the short pipe portion (14) is inserted into the receiving port of the joint body (12). In the previous state, it is formed integrally with the member (50) serving as the receiving port by welding or cutting.

  According to the second invention, since the structure around the locking portion of the receiving port can be simplified, the cost can be reduced and the productivity is also improved.

  The third invention is dependent on the first or second invention, wherein the short pipe portion is made of synthetic resin, and the separation preventing portion is bonded and bonded to one end portion of the C ring made of synthetic resin. It is formed.

  In the third invention, the detachment preventing portion (36) formed at one end (34) of the short tube portion (14) made of synthetic resin is formed by adhesively bonding a C ring made of synthetic resin. . For example, as the C-ring, an end of a synthetic resin pipe having the same diameter as that of the short pipe portion is cut in the circumferential direction, and the cut ring is cut in the axial direction. If the separation preventing part is formed by using a C ring having an inner diameter smaller than the outer diameter of the short pipe part, a force for sandwiching the short pipe part acts due to the diameter reduction effect of the C ring. Bonding strength can be increased.

  A fourth invention is dependent on the first or second invention, wherein the short tube portion is made of a synthetic resin, and the detachment preventing portion is formed by expanding one end of the diameter.

  In the fourth invention, the detachment preventing portion (36) formed at one end (34) of the short tube portion (14) made of synthetic resin is subjected to diameter expansion processing (receiving opening processing) at one end. Formed by.

  According to the fourth aspect of the invention, since the separation preventing part is formed as an integral part having no adhesive part, the strength is higher than that of the separation preventing part retrofitted to the short pipe part.

  A fifth invention is dependent on any one of the first to fourth inventions, and further includes a cushioning rubber provided between the inner part of the receiving port and one end of the short tube part.

  In the fifth invention, the shock absorbing rubber (42) provided between the back part (24) of the receiving port (22) of the joint body (12) and the one end part (36) of the short pipe part (14) is provided. Further prepare.

  According to the fifth aspect of the present invention, it is possible to mitigate the impact caused by the shock absorbing rubber when the inner portion of the receptacle and the one end portion of the short tube portion abut against each other. Further, for example, even when the short tube portion is connected to the receiving port so as not to move in the axial direction, if the buffer rubber has a predetermined thickness, the connection between the receiving port and the short tube portion Flexibility can be exerted between them, and breakage due to contact between the receiving port and the short tube portion when bent can be prevented.

  The sixth invention is dependent on any one of the first to fifth inventions, and is connected to the flange provided at the front end of the receiving port and the flange via a bolt and a nut. A push ring for pressing the rubber ring is further provided.

  In the sixth invention, a flange (74) is provided at the tip of the receiving port (22) of the joint body (12), and a press ring is provided on the flange via a bolt (76) and a nut (78). (70) are linked. The water stop rubber ring (72) is pressed by the press ring when the nut is tightened, and is compressed and deformed until it comes into close contact with the inner surface of the receiving port and the outer surface of the short pipe portion (14) with a water stop surface pressure of a certain level or more. Therefore, the water stoppage of the receiving part is ensured.

  7th invention is a pipe joint member used for manufacture of a pipe joint concerning any 1st thru / or the 6th invention, and is formed in a short tube shape, and the latching part formed in advance in the inner surface beforehand A steel receiving member having a flange at one end edge, one end portion is disposed in the receiving member, and is formed at a position on the one end edge side of the receiving member from the locking portion of the one end portion The pipe joint member includes a short pipe member having a detachment preventing portion and a water stop rubber ring mounted between the inner surface of the receiving member and the outer surface of one end portion of the short pipe member.

  In the seventh invention, the pipe joint member (90) includes the receiving member (50) and the short pipe member (54), and is used as a member (part) for manufacturing the pipe joint (10). The receiving member is a steel member that becomes the cylindrical portion (26) of the receiving port (22), and a locking portion (28) is integrally formed on the inner surface thereof by welding or cutting, etc. A flange (80) is formed at the end edge (back side end edge). The short tube member is a member that becomes the short tube portion (14), and a separation preventing portion (36) is formed at one end portion (34) thereof. And the one end part of a short pipe member is arrange | positioned in a receptacle member, and the rubber ring for water stop (40) is mounted between the inner surface of a receptacle member and the outer surface of one end part of a short pipe member. Is done. Further, the separation preventing part is disposed at a position on the back side from the locking part.

  According to the seventh aspect of the present invention, pipe joints having various shapes that are highly reliable with respect to prevention of disengagement and water stop can be easily manufactured. In addition, since the structure around the receiving portion of the receiving port can be simplified by forming the locking portion integrally with the receiving member in advance, the cost can be reduced and the productivity is also improved.

  8th invention is a manufacturing method of a pipe joint provided with a steel joint main body which has a receptacle, and a short pipe part by which one end was inserted in a receptacle, and (a) a locking part is provided in the inner surface. Providing a short tubular steel receiving member, a steel main body member, and a short pipe member having a detachment preventing portion at one end, (b) one end of the short pipe member is in the receiving member Attaching the short tube member to the receiving member by inserting the other end of the short tube member from the back opening of the receiving member until it is accommodated in the receiving member, and (c) the back of the receiving member It is a manufacturing method of a pipe joint including the step which joins a body member to a side opening edge, and forms a receiving mouth.

  In the eighth invention, the pipe joint (10) in which the one end (34) of the short pipe part (14) is fitted into the receiving port (22) of the steel joint main body (12) and the both are integrated. Manufacturing. In step (a), a receiving member (50), a main body member (52), and a short tube member (54) are prepared. Here, the receiving member is a steel member that becomes the tube portion (26) of the receiving port, and the locking portion (28) is formed on the inner surface thereof. The main body member is a steel member that becomes at least the back portion (24) of the receiving port, and has at least a bowl-shaped portion. The short tube member is a member made of, for example, a synthetic resin that becomes the short tube portion (14), and a separation preventing portion (36) is formed at one end portion (34) thereof. In step (b), a short tube member is attached to the receiving member. Here, the other end (38) of the short tube member is inserted from the back side opening (56) side of the receiving member. And this insertion operation is continued until the one end part of a short tube member is accommodated in a receptacle member. In step (c), the main body member is welded or flanged to the rear opening edge (58) of the receiving member. As a result, a receiving port is formed, and the detachment preventing portion of the short tube portion is fitted between the inner portion of the receiving port and the locking portion.

  According to the eighth aspect of the invention, since the pipe joint in which the joint main body and the short pipe portion are integrated in advance can be manufactured, the connection between the joint main body and the short pipe portion can be performed with a certain quality. Reliability for water stop can be increased. Moreover, since it is not necessary to connect a joint main body and a short pipe part at a construction site, the pipe joint which is excellent in workability and can aim at shortening of working time can be manufactured.

  Furthermore, when attaching one end of the short pipe part to the joint opening, it is not necessary for the detachment prevention part to get over the locking part, so the protrusion height of the detachment prevention part to the outside can be increased. it can. That is, since the height or area at which the separation preventing portion and the engagement portion are engaged can be increased, the separation of the short tube portion from the receiving port can be reliably prevented.

  9th invention is a manufacturing method of a pipe joint provided with the steel joint main body which has a receptacle, and the short pipe part by which one end was inserted in the receptacle, (a) A locking part is provided in the inner surface. A step of preparing a short tubular steel receiving member, a steel main body member, and a short tube member, (b) a step of inserting and attaching the short tube member to the receiving member, (c) a short tube member A step of forming a separation preventing portion at one end portion, (d) a step of accommodating one end portion of the short tube member formed with the separation preventing portion in the receiving member, and (e) a rear opening edge of the receiving member. This is a method for manufacturing a pipe joint, including the step of joining a main body member to form a receiving port.

  In 9th invention, the pipe joint (10) by which the one end part (34) of the short pipe part (14) was inserted by the receptacle (22) of the steel coupling main body (12), and both were integrated. Manufacturing. In step (a), a receiving member (50), a main body member (52), and a short tube member (54) are prepared. Here, the receiving member is a steel member that becomes the tube portion (26) of the receiving port, and the locking portion (28) is formed on the inner surface thereof. The main body member is a steel member that becomes at least the back portion (24) of the receiving port, and has at least a bowl-shaped portion. A short pipe member is a short tubular member used as the short pipe part (14). In step (b), the short tube member is inserted and attached to the receiving member. At this time, the short tube member may be inserted from the front end side opening of the receiving member, or may be inserted from the back side opening (56). In step (c), a separation preventing portion is formed at one end of the short tube member. For example, a C-ring is bonded and bonded to one end of the short tube member, or the diameter of one end is increased. In step (d), one end portion of the short tube member in which the separation preventing portion is formed is accommodated in the receiving member. In step (e), the main body member is welded to the rear opening edge (58) of the receiving member. As a result, a receiving port is formed, and the detachment preventing portion of the short tube portion is fitted between the inner portion of the receiving port and the locking portion.

  According to the ninth invention, similarly to the eighth invention, a pipe joint in which the joint main body and the short pipe portion are integrated in advance can be manufactured. Therefore, the connection between the joint main body and the short pipe portion can be performed with a certain quality. It is possible to improve the reliability of preventing separation and water stoppage. Moreover, since it is not necessary to connect a joint main body and a short pipe part at a construction site, the pipe joint which is excellent in workability and can aim at shortening of working time can be manufactured. Furthermore, when attaching one end of the short pipe part to the joint opening, it is not necessary for the detachment prevention part to get over the locking part, so the protrusion height of the detachment prevention part to the outside can be increased. it can. That is, since the height or area at which the separation preventing portion and the engagement portion are engaged can be increased, the separation of the short tube portion from the receiving port can be reliably prevented.

  A tenth aspect of the invention is a pipe joint manufactured using the pipe joint manufacturing method of the eighth or ninth aspect of the invention.

  According to the tenth invention, the same effect as the eighth or ninth invention can be expected.

  An eleventh invention is a pipe connection structure including the pipe joint according to any one of the first to sixth and tenth inventions, and a pipe adhesively bonded to the other end of the short pipe portion of the pipe joint.

  In the eleventh aspect, the other end portion (38) of the short pipe portion (14) of the pipe joint (10) is formed, for example, in the shape of an outlet, and is used for other pipes such as a double socket and a pipe with a socket. For example, it is bonded to the receiving port, or is formed in a receiving shape, for example, and bonded to the other port of the tube.

  According to the eleventh aspect, the same operational effects as those of any of the first to sixth and tenth aspects can be expected.

  According to this invention, since the joint body and the short pipe portion are integrated in advance at the manufacturing factory, the connection between the joint main body and the short pipe portion can be performed with a certain quality, and against the separation prevention and water stoppage. Reliability can be improved. Moreover, since it is not necessary to connect a joint main body and a short pipe part at the construction site, it is excellent in workability and can shorten working time.

  The above object, other objects, features, and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is an illustration figure which shows the external appearance of one Example of the pipe joint of this invention. It is sectional drawing which shows the longitudinal cross-section of the pipe joint of FIG. It is a fragmentary sectional view which expands and shows the receptacle peripheral part of the pipe joint of FIG. It is an illustration figure for demonstrating an example of the manufacturing method of the pipe joint of FIG. It is an illustration for demonstrating another example of the manufacturing method of the pipe joint of FIG. It is a fragmentary sectional view which expands and shows the receiving port periphery of the pipe joint which is another Example of this invention. It is a fragmentary sectional view which expands and shows the receiving port periphery of the pipe joint which is another Example of this invention. It is a fragmentary sectional view which expands and shows the receiving port periphery of the pipe joint which is another Example of this invention. It is a fragmentary sectional view which expands and shows the receiving port periphery of the pipe joint which is another Example of this invention. It is a fragmentary sectional view which shows the pipe joint member with which the pipe joint of FIG. 9 is provided. It is a fragmentary sectional view which expands and shows the receiving port periphery of the pipe joint which is another Example of this invention. It is a fragmentary sectional view which expands and shows the connection part of the conventional T-shaped steel deformed pipe. It is a fragmentary sectional view which expands and shows the connection part of the conventional M-shaped steel profile pipe.

  Referring to FIG. 1, a pipe joint 10 according to an embodiment of the present invention includes a joint body 12 and a short pipe portion 14, and is used, for example, to connect a rigid polyvinyl chloride pipe used for agricultural water. . As will be described in detail later, the pipe joint 10 is one in which one end 34 of the short pipe portion 14 is fitted into the receiving port 22 of the joint main body 12 so that both are integrated. The inner diameter of the pipe joint 10 is, for example, 600 mm, and the total length thereof is, for example, 2100 mm.

  As shown in FIGS. 2 and 3, the joint body 12 is a deformed pipe formed by processing a steel plate or a steel pipe such as carbon steel or stainless steel. In this embodiment, the joint body 12 is a 22.5 degree bent pipe, and includes a bent pipe portion 20 bent at a bending angle of 22.5 degrees and receiving ports 22 formed at both ends thereof.

  The receiving port 22 is an enlarged diameter receiving port having a bowl-shaped inner portion 24 and a short cylindrical tube portion 26 formed at the end of the bent tube portion 20. The cylindrical portion 26 is formed with a locking portion 28 that protrudes from the inner surface and extends over the entire length in the circumferential direction. The locking portion 28 is integrally formed with the cylindrical portion 26 by welding or cutting. The protruding height of the locking portion 28 is, for example, 20 mm. Further, an annular protrusion 30 for mounting a water stop rubber ring 40 is formed on the tube end side of the locking portion 28 of the cylindrical portion 26, and a buffer rubber 42 is mounted on the back portion 24. An annular groove 32 is formed.

  The short pipe portion 14 is formed of a synthetic resin such as hard polyvinyl chloride, and the outer diameter thereof is approximately the same as the inner diameter of the locking portion 28 of the receiving port 22. One end portion 34 of the short tube portion 14 is accommodated in the receiving port 22 of the joint body 12, and a separation preventing portion 36 that protrudes outward is formed at the one end portion 34. The other end 38 of the short pipe portion 14 is used as a gap when connecting the pipe joint 10 to another pipe. For example, a receiving socket such as a synthetic resin double socket or a synthetic resin pipe with a receptacle is used. Bonded to the mouth. However, after assembling the pipe joint 10 as shown in the manufacturing method described later, the other end portion 38 of the short pipe portion 14 can be processed into a receiving port, and the outlets of other tubes can be adhesively bonded. That is, the other end portion 38 of the short tube portion 14 can be a receiving port.

  The detachment preventing portion 36 is formed at a position on the back side of the receiving port 22 from the locking portion 28, and is locked to the locking portion 28 of the receiving port 22 when a pulling force is applied to the short tube portion 14. This prevents the short pipe portion 14 from being detached. The separation preventing portion 36 is formed over the entire length in the circumferential direction of the short tube portion 14 or substantially the entire length. The protruding height of the detachment preventing portion 36 is set to a height at which the detachment preventing portion 36 cannot get over the locking portion 28 even if the receiving port 22 or the short tube portion 14 is elastically deformed, for example, 20 mm. In this embodiment, the separation preventing part 36 is formed by attaching a C-ring to the outer surface of the short pipe part 14 and adhesively bonding it. As the C-ring, an end of a synthetic resin pipe having the same diameter as the short pipe portion 14 is cut in the circumferential direction, and the cut ring is cut in the axial direction. If the inner surface of the C ring does not follow the outer surface of the short tube portion 14, the C ring may be processed so that the inner surface of the C ring follows the outer surface of the short tube portion 14. In this way, if the separation preventing portion 36 is formed using a C-ring having an inner diameter smaller than the outer diameter of the short tube portion 14, a force for sandwiching the short tube portion 14 acts due to the diameter reducing effect of the C-ring. The joint strength between the ring and the short tube portion 14 can be increased. In addition, the tube member that becomes the short tube portion 14 can be manufactured by cutting a commercially available long synthetic resin tube, but the C ring that becomes the separation preventing portion 36 can also be manufactured using the same synthetic resin tube. Therefore, the manufacturing cost can be kept low. However, the detachment preventing portion 36 can be formed using a C-ring having an inner diameter that is the same as the outer diameter of the short tube portion 14.

  A water stop rubber ring 40 is attached to the annular protrusion 30 of the receiving port 22 of the joint body 12. The water stop rubber ring 40 is compressed between the inner surface of the receiving port 22 of the joint body 12 and the outer surface of the one end portion 34 of the short tube portion 14 to ensure water tightness during this time. That is, the water-stopping rubber ring 40 prevents water flowing in the pipeline from flowing out and surrounding groundwater and rainwater from flowing into the pipeline.

  An annular buffer rubber 42 having a convex cross section is mounted in the annular groove 32 of the receiving port 22, and an annular buffer rubber 44 having a circular cross section is mounted on the back side of the locking portion 28 of the receiving port 22. The That is, the cushioning rubbers 42 and 44 are mounted between the back portion 24 of the receiving port 22 and the separation preventing portion 36 and between the locking portion 28 and the separation preventing portion 36 of the receiving port 22, respectively. The impact when the receiving port 22 and the separation preventing part 36 (short pipe part 14) abut is alleviated. In addition, a gap is provided between the separation preventing portion 36 and each of the buffer rubbers 42 and 44, and the short tube portion 14 is movable in the axial direction with respect to the receiving port 22. Thereby, the expansion and contraction of the constructed pipeline can be absorbed by the receiving port 22 portion. The size of the gap provided between the separation preventing portion 36 and each of the cushioning rubbers 42, 44, that is, the expansion / contraction allowance may be appropriately set according to the desired extendable length, for example, several mm to several hundred mm Is set.

  In such a pipe joint 10, when a force in the direction of entering the short pipe portion 14 is applied, the end portion of the short pipe portion 34 including the detachment preventing portion 36 is connected to the back portion 24 of the receiving port 22 via the buffer rubber 42. The short tube portion 14 is prevented from entering the bent tube portion 20. On the other hand, when a force in the pulling direction is applied to the short tube portion 14, the separation preventing portion 36 is locked to the locking portion 28 of the receiving port 22 via the cushioning rubber 44, and the short tube portion from the receiving port 22. 14 detachment is prevented.

  Then, with reference to FIG. 4 and FIG. 5, the manufacturing method of the pipe joint 10 is demonstrated. In addition, the pipe joint 10 is manufactured in a manufacturing factory, and is shipped in the state which can be used immediately in a construction site. Moreover, although description is abbreviate | omitted, it can manufacture similarly using the manufacturing method shown in FIG.4 and FIG.5 also about the pipe joint 10 of the other Example mentioned later and another modification.

  In the manufacturing method shown in FIG. 4, first, a receiving member 50, a main body member 52, and a short tube member 54 are prepared as shown in FIG. Here, the receiving member 50 is a steel member that becomes the cylindrical portion 26 of the receiving port 22, and the locking portion 28 and the annular protrusion 30 are integrally formed in advance on the inner surface thereof by welding or cutting. Is done. The main body member 52 is a steel member that becomes the bent portion 20 and the back portion 24 of the receiving port 22, and is formed in a short cylindrical shape having one end edge inclined with respect to the other end edge, and the other end side is a flange. It is formed in a shape. The short tube member 54 is a synthetic resin member that becomes the short tube portion 14, and a detachment preventing portion 36 is integrally formed in advance at one end portion 34 thereof by adhesive bonding or the like. The water retaining rubber ring 40 and the buffer rubber 44 are attached to the receiving member 50, and the buffer rubber 42 is attached to the main body member 52.

  Next, as shown in FIG. 4B, the short tube member 54 is attached to the receiving member 50. Here, the other end 38 of the short tube member 54 is inserted from the back opening 56 side of the receiving member 50. The insertion operation is continued until the one end portion 34 of the short tube member 54 is completely accommodated in the receiving member 50.

  Subsequently, as shown in FIG. 4C, the receiving member 50 and the main body member 52 are welded. That is, the rear opening edge 58 of the receiving member 50 and the other end side (back portion 24) peripheral edge portion 60 of the main body member 52 are welded. Accordingly, the receiving port 22 is formed, and the detachment preventing portion 36 of the short tube portion 14 (short tube member 50) is fitted between the back portion 24 of the receiving port 22 and the locking portion 28.

  4A to 4C are repeated to produce two members 62 in which the receiving member 50, the main body member 52, and the short tube member 54 are integrated. Thereafter, as shown in FIG. 4D, the one end faces 64 of the two members 62 are welded to each other, whereby the manufacture of the pipe joint 10 is completed.

  Here, for example, when the receiving port 22 and the short tube portion 14 are integrated, if one end 34 of the short tube portion 14 is inserted from the opening on the front end side of the receiving port 22, the separation preventing portion 36 is engaged. It is necessary to get over the stop 28. For this reason, the protruding height of the separation preventing portion 36 must be set in consideration of the range in which the receiving port 22 and the short tube portion 14 can be elastically deformed so that the separation preventing portion 36 can get over the locking portion 28. Accordingly, the height or area at which the separation preventing portion 36 and the locking portion 28 are locked is reduced. In particular, when the short pipe portion 14 is made of synthetic resin, the strength is weaker than that of steel, so if the locking height between the detachment preventing portion 36 and the locking portion 28 is small, the detachment preventing function is provided. There is a risk that it may not be fully utilized. Further, in order for the detachment preventing portion 36 to get over the locking portion 28, it is necessary to force the short tube portion 14 into the receiving port 22 and insert it.

  However, as in the manufacturing method shown in FIG. 4, the other end portion 38 of the short tube member 54 is inserted from the back opening 56 side of the receiving member 50, and the receiving port is inserted after the short tube member 54 is inserted. If the rear portion 24 of the weld 22 is welded, the detachment preventing portion 36 does not need to get over the locking portion 28. Therefore, the protrusion height of the separation preventing portion 36 to the outside can be set to a height exceeding the range in which the receiving port 22 and the short tube portion 14 can be elastically deformed. That is, since the height or area at which the separation preventing portion 36 and the latching portion 28 are latched can be increased, the detachment of the short tube portion 14 from the receiving port 22 can be reliably prevented. Further, it is possible to avoid damage to the short pipe portion 14 and the receiving port 22 due to excessive pushing.

  Further, for example, when a C-ring (lock ring) is used as a locking portion provided in the receiving port as in a known detachment prevention mechanism used when connecting steel pipes, the structure around the locking portion is It becomes complicated. Furthermore, after connecting the joint body and the short pipe portion, the type in which the locking portion is attached to the receiving end with a flange has to increase the strength of the flange portion, resulting in an increase in cost. Furthermore, in a type in which a water stop rubber ring is interposed between the separation preventing portion and the locking portion, strong water pressure is always applied to the water stop rubber ring, and the water stop rubber There may be a problem of water stoppage due to compression set that prevents the ring from returning from being compressed.

  On the other hand, in this embodiment, the locking portion 28 is integrally formed in advance with the cylindrical portion 26 of the receiving port 22. That is, in a state before the one end 34 of the short tube portion 14 is fitted into the receiving port 22 of the joint body 12, the locking portion 28 is integrated in advance with the receiving member 50 by welding or cutting. Yes. Thereby, since the structure around the latching | locking part 28 of the receptacle 22 can be simplified, cost reduction can be aimed at and productivity is also improved.

  In the manufacturing method shown in FIG. 4, the main body member 52 integrally formed in advance is prepared. However, the main body member 52 includes a short cylindrical portion that becomes the joint main body 20 and a back portion 24 of the receiving port 22. 4 may be prepared as a separate body. In the step shown in FIG. 4C, after the hook-shaped portion is welded to the receiving member 50, a short cylinder is formed on the hook-shaped portion. You may make it weld a shaped part.

  Further, the short tube member 54 is prepared in advance with the separation preventing portion 36 formed thereon, but is not limited to this. The short tube member 54 may be a simple short tube in which the separation preventing portion 36 is not formed. When the short tube member 54 is attached to the receiving member 50 as in the manufacturing method shown in FIG. The detachment preventing portion 36 may be formed on the short tube member 54. Hereinafter, although it demonstrates concretely with reference to FIG. 5, description is abbreviate | omitted or simplified about the part similar to the manufacturing method shown in FIG.

  In the manufacturing method shown in FIG. 5, first, a receiving member 50, a main body member 52, and a short tube member 54 are prepared as shown in FIG. Here, as the short tube member 54, a short tubular member 54 a and a C ring 54 b which is a member that becomes the detachment preventing portion 36 are prepared separately.

  Next, as shown in FIG. 5B, a short tubular member 54a is inserted and attached to the receiving member 50. In this case, it is preferable to insert the short tubular member 54 a from the opening on the front end side of the receiving member 50. Thereby, in the manufacturing method of FIG. 4, the rubber ring for water stop 40 that has been mounted in the opposite direction can be mounted in the conventional direction. However, the short tubular member 54 a may be inserted from the back opening 56 of the receiving member 50. This insertion operation is continued until one end portion of the short tubular member 54a slightly protrudes from the rear opening 56 of the receiving member 50.

  Subsequently, as shown in FIG. 5C, the C-ring 54b is bonded and joined to the short tubular member 54a to form the separation preventing portion 36 at one end 34 of the short tube member 54. One end 34 of the tube member 54 is accommodated in the receiving member 50.

  Next, as shown in FIG. 5D, the receiving member 50 and the main body member 52 are welded. That is, the rear opening edge 58 of the receiving member 50 and the other end side (back portion 24) peripheral edge portion 60 of the main body member 52 are welded. 5A to 5D are repeated to produce two members 62 in which the receiving member 50, the main body member 52, and the short tube member 54 are integrated, and then the two members 62 are manufactured. By welding the one end faces 64 of each other, the manufacture of the pipe joint 10 is completed.

  In the manufacturing method shown in FIG. 5 as well, as in the manufacturing method shown in FIG. 4, it is not necessary for the separation preventing portion 36 to get over the locking portion 28. 22 and the short pipe part 14 can be enlarged beyond the range which can be elastically deformed. That is, it is possible to increase the height or area at which the separation preventing portion 36 and the locking portion 28 are locked.

  According to this embodiment, the joint body 12 made of steel and the short pipe portion 14 made of synthetic resin are integrated in advance at the manufacturing factory, so that the connection between the joint main body 12 and the short pipe portion 14 can be made with a certain quality. It can be carried out. Therefore, the reliability with respect to the prevention of detachment and water stop in the pipe joint 10 can be enhanced. Moreover, since it is not necessary to connect the coupling main body 12 and the short pipe part 14 at a construction site, it is excellent in workability and can shorten working time. Further, the protruding height of the separation preventing portion 36 is set to a height at which the separation preventing portion 36 cannot get over the locking portion 28, that is, a height exceeding the range where the receiving port 22 and the short tube portion 14 can be elastically deformed. Therefore, the detachment of the short pipe portion 14 from the receiving port 22 can be reliably prevented.

  In the above-described embodiment, the detachment preventing portion 36 is formed by adhesively bonding a C-ring to the outer surface of the one end portion 34 of the short tube portion 14, but the method of forming the detachment preventing portion 36 is particularly limited. Not. For example, as shown in FIG. 6, the detachment preventing portion 36 can be formed by subjecting the one end portion 34 of the short tube portion 14 to diameter expansion processing (receiving port processing). Since the separation preventing part 36 formed by the diameter expansion process is an integral part that does not have an adhesive part, the strength is higher than that of the separation preventing part 36 that is retrofitted to the short tube part 14. Further, since the work for expanding the diameter is easy, the separation preventing portion 36 can be easily formed.

  Next, a pipe joint 10 which is another embodiment of the present invention will be described with reference to FIG. In addition, the pipe joint 10 shown in FIG. 7 ensures the water stop of the receiving port 22 part by compressing the rubber ring 72 for water stop using the push ring 70, otherwise the pipe joint shown in FIG. 10 are the same as those in FIG. 10, the same reference numerals are given to the common parts, and the overlapping description is simplified or omitted.

  As shown in FIG. 7, the pipe joint 10 includes a steel joint body 12 and a synthetic resin short pipe section 14. A locking portion 28 extending over the entire length in the circumferential direction is formed on the inner surface of the cylindrical portion 26 of the receiving port 22 of the joint body 12. One end portion 34 of the short tube portion 14 is accommodated in the receiving port 22 of the joint body 12, and a separation preventing portion 36 that protrudes outward is formed at the one end portion 34. The separation preventing portion 36 is formed by attaching a C-ring to the outer surface of the short tube portion 14 and adhesively bonding the C-ring. Further, shock absorbing rubbers 42 and 44 are mounted between the inner portion 24 of the receiving port 22 and the separation preventing portion 36 and between the locking portion 28 of the receiving port 22 and the separation preventing portion 36, respectively. .

  In the pipe joint 10 shown in FIG. 7, a flange 74 is provided on the outer surface of the distal end portion of the receiving port 22, and a press ring 70 is connected to the flange 74 via a T-head bolt 76 and a nut 78. . Further, two water-stopping rubber rings 72 having a circular cross section are mounted on the inner surface of the distal end portion of the receiving port 22 of the joint body 12. In such a pipe joint 10, the push ring 70 is pressed against the outer end surface of the water stop rubber ring 72 by tightening the nut 78 against the T-head bolt 76. As a result, the water stop rubber ring 72 is compressed and deformed between the locking portion 28 and the push ring 70, and is in close contact with the inner surface of the receiving port 22 and the outer surface of the one end 34 of the short tube portion 14 with a predetermined or higher water stop surface pressure. Thus, water tightness during this period is ensured.

  Also in the pipe joint 10 shown in FIG. 7, since the joint main body 12 and the short pipe portion 14 are integrated in advance at the manufacturing factory, the connection between the joint main body 12 and the short pipe portion 14 can be performed with a certain quality. . Therefore, the reliability with respect to the prevention of detachment and water stop in the pipe joint 10 can be enhanced. Moreover, since it is not necessary to connect the coupling main body 12 and the short pipe part 14 at a construction site, it is excellent in workability and can shorten working time.

  Further, as shown in FIG. 8, also in the pipe joint 10 of the type including the pusher wheel 70, the detachment preventing portion 36 can be formed by subjecting the one end portion 34 of the short tube portion 14 to diameter expansion processing.

  In each of the above-described embodiments, the short tube portion 14 can be moved in the axial direction with respect to the receiving port 22, but is not limited thereto, and the separation preventing portion 36 and the respective cushioning rubbers 42, 44. And the short tube portion 14 may be fixedly connected to the receiving port 22. This makes it difficult for solids or the like mixed in the water flowing in the pipe to enter between the inner surface of the receiving port 22 and the outer surface of the short pipe portion 14. Even when the short tube portion 14 is fixedly connected to the receiving port 22, the buffer rubber 42 has a predetermined thickness, so that the flexible tube 42 is flexible between the receiving port 22 and the short tube portion 14. In addition, it is possible to prevent damage due to the contact between the receiving port 22 and the short tube portion 14 when bent.

  In each of the above-described embodiments, the diameter of the joint 22 is larger than that of the curved pipe portion 20, but the present invention is not limited thereto. A receptacle having the same diameter may be used. In this case, it is preferable to prevent the short tube portion 14 from entering further by providing a stopper corresponding to the back portion 24 at a predetermined position on the inner surface of the receiving port 22. However, one end portion 34 of the short pipe portion 14 is in contact with the inner surface of the joint main body 12 or the short pipe portion 14 fitted into the other receiving port 22 of the joint main body 12 or the like. In the case where entry is prevented, the stopper is not necessarily provided. Further, when the stopper is not provided, the interval between the short tube portions 14 is appropriately adjusted. When the stopper is provided, the interval between the locking portion 28 and the stopper and the length of the separation preventing portion 36 are appropriately set. By adjusting, the size of the movable range of the short tube portion 14 in the tube axis direction can be adjusted.

  Further, in each of the above-described embodiments, an annular buffer is provided between the back portion 24 of the receiving port 22 and the separation preventing portion 36 and between the locking portion 28 of the receiving port 22 and the separation preventing portion 36. Although the rubbers 42 and 44 are attached, these are not necessarily provided. Further, the cushioning rubbers 42 and 44 may be provided partially (intermittently) with respect to the circumferential direction instead of being annularly extending over the entire length in the circumferential direction. Further, the cushioning rubbers 42 and 44 may be attached to the short tube portion 14 side instead of being attached to the receiving port 22 side.

  Further, in each of the above-described embodiments, the locking portion 28 and the separation preventing portion 36 are formed so as to extend over the entire circumference or substantially the entire circumference in the circumferential direction, but the present invention is not limited to this. As long as the locking portion 28 and the detachment preventing portion 36 are reliably engaged with each other, the locking portion 28 and the detachment preventing portion 36 can be partially (intermittently) provided in the circumferential direction.

  Further, in each of the above-described embodiments, the joint body 12 of the pipe joint 10 is a 22.5 degree curved pipe with both receiving ports, but the bending angle and shape of the joint body 12 are not particularly limited, and various variants are possible. Tube shape can be adopted. For example, the joint body 12 can be formed into a flange short tube shape in which one is a receiving port 22 and the other is a flange, or can be formed in a T-shaped or cross-shaped branched tube having at least one receiving port 22. it can. Moreover, the joint main body 12 does not necessarily need to be formed in a deformed pipe shape, and a straight pipe shape can also be adopted.

  Further, in each of the above-described embodiments, welding is used when the receiving member 50 and the main body member 52 are joined to form the receiving port 22. However, the joining method is not limited to welding as long as the joining portion has a predetermined strength and can secure water tightness. For example, as shown in FIG. 9, flange joining may be used.

  In the embodiment shown in FIG. 9, a flange 80 that protrudes outward from the rear side edge of the cylindrical portion 26 is formed, and a flange 82 that protrudes outward from the edge of the rear portion 24 so as to face the flange 80. Is formed. That is, flanges 80 and 82 projecting outward are formed at a joint portion between the receiving member 50 and the main body member 52. Then, by tightening and fixing these flanges 80 and 82 with bolts 84 and nuts 86 and the like, the back portion 24 and the cylindrical portion 26 are joined. Further, a water-stop packing 88 is sandwiched between the flanges 80 and 82, and water tightness between them is ensured.

  By forming the receiving port 22 using flange bonding as in the embodiment shown in FIG. 9, the anticorrosion coating of the pipe joint 10 can be performed easily. That is, the pipe joint 10 is piped after being subjected to anticorrosion coating with an epoxy resin or the like, but when the receptacle 22 is formed by welding, the anticorrosion is only applied after welding in order to avoid the influence of heat. Cannot paint. On the other hand, when flange joint is used, the receptacle 22 can be formed after the anticorrosion coating is applied, so that the degree of freedom in the manufacturing process of the pipe joint 10 is increased and the corrosion prevention on the inner surface side of the receptacle 22 is performed. Easy to paint.

  Moreover, when forming the receptacle 22 using flange joining, if the pipe joint member 90 as shown in FIG. 10 is manufactured, it can respond to manufacture of the pipe joint 10 of various shapes. Specifically, as shown in FIG. 10, the pipe joint member 90 includes a receiving member 50 and a short pipe member 54. The receiving member 50 is a steel member that becomes the cylindrical portion 26 of the receiving port 22, and a locking portion 28 is formed on the inner surface thereof, and a flange 80 that protrudes outward is formed on the inner edge of the inner side. Is done. The short tube member 54 is a short tubular member made of synthetic resin that becomes the short tube portion 14, and a separation preventing portion 36 is formed at one end portion 34 thereof. One end 34 of the short tube member 54 is disposed in the receiving member 50, and a water-stopping rubber is provided between the inner surface of the receiving member 50 and the outer surface of the one end 34 of the short tube member 54. A wheel 40 is attached. Further, the detachment preventing portion 36 is disposed at a position deeper than the locking portion 28, and the protruding height of the detachment preventing portion 36 is such that the detachment preventing portion 36 even if the receiving member 50 and the short tube member 54 are elastically deformed. 36 is set to a height at which 36 cannot get over the locking portion 28.

  Since such a pipe joint member 90 can be combined with the main body member 52 having various shapes, the pipe joint 10 having various shapes can be easily manufactured by using the pipe joint member 90. For example, when it is desired to manufacture a T-shaped pipe joint 10 having a branch pipe portion having a detachment preventing function, a flange 82 is formed on the branch pipe portion of the steel T-shaped joint, and a pipe joint member 90 is formed thereon. It is only necessary to join the flange.

  Further, when the receiving port 22 is not an enlarged diameter receiving port (having the same diameter receiving port), as shown in FIG. If it is sandwiched between the stoppers, the stopper can be easily formed. That is, by using the pipe joint member 90, the same diameter receiving port having the stopper can be easily formed.

  In each of the above-described embodiments, the short pipe portion 14 is made of a synthetic resin. However, the present invention is not limited to this, and the material of the short pipe portion 14 is changed according to the material of other pipes connected to the pipe joint 10. It can also be changed.

  Further, the specific numerical values such as the dimensions mentioned above are merely examples, and can be appropriately changed according to the needs of the product specifications and the like.

DESCRIPTION OF SYMBOLS 10 ... Pipe joint 12 ... Joint main body 14 ... Short pipe part 20 ... Curved pipe part 22 ... Receiving port 28 ... Locking part 36 ... Detachment prevention part 40, 72 ... Water stop rubber ring 42, 44 ... Buffer rubber 50 ... Receptacle member 52 ... Body member 54 ... Short pipe member 70 ... Push ring 74 ... Flange 76 ... T-head bolt 78 ... Nut 80, 82 ... Flange 90 ... Pipe joint member 100, 102 ... Conventional steel plate deformed pipe

Claims (11)

A steel fitting body having a receptacle,
A short pipe portion whose one end portion is inserted into the receiving port, and a water stop rubber ring mounted between the inner surface of the receiving port and the outer surface of the one end portion,
The joint body has a locking portion formed on the inner surface of the receiving port,
The short tube portion is formed at a position on the back side of the receiving port from the locking portion at the one end portion, and is locked to the locking portion when a force in the pulling direction is applied. A pipe joint having a detachment preventing portion for preventing detachment.   The pipe joint according to claim 1, wherein the locking portion is formed integrally with the receiving port in advance. The short pipe portion is made of synthetic resin,
The pipe joint according to claim 1 or 2, wherein the separation preventing portion is formed by adhesively bonding a synthetic resin C-ring to the one end portion. The short pipe portion is made of synthetic resin,
The pipe joint according to claim 1 or 2, wherein the separation preventing portion is formed by expanding the one end portion.   The pipe joint in any one of Claims 1 thru | or 4 further equipped with the rubber | gum for buffer provided between the back part of the said receiving port, and the one end part of the said short pipe part. The flange provided in the front-end | tip part of the said receiving port, It is connected with the said flange through a volt | bolt and a nut, The press ring which presses the said water stop rubber ring by clamp | tightening the said nut is further provided. The pipe joint in any one of. A pipe joint member used for manufacturing the pipe joint according to any one of claims 1 to 6,
A steel receiving member that is formed in a short tubular shape, has a locking portion that is integrally formed in advance on the inner surface, and has a flange on one end edge;
A short tube member having one end portion disposed in the receiving member and having a separation preventing portion formed at a position on the one end edge side of the receiving member from the locking portion of the one end portion; and the receiving port A pipe joint member comprising a water stop rubber ring mounted between an inner surface of the member and an outer surface of one end of the short pipe member. A manufacturing method of a pipe joint comprising a steel joint body having a receiving port and a short pipe part having one end inserted into the receiving port,
(A) providing a short tubular steel receiving member having a locking portion on the inner surface, a steel main body member, and a short tube member having a separation preventing portion at one end;
(B) The other end of the short tube member is inserted from the back side opening of the receiving member until one end of the short tube member is accommodated in the receiving member. A method of manufacturing a pipe joint, comprising: attaching the short pipe member to a mouth member; and (c) joining the body member to a rear opening edge of the mouth member to form the mouth. A manufacturing method of a pipe joint comprising a steel joint body having a receiving port and a short pipe part having one end inserted into the receiving port,
(A) preparing a short tubular steel receiving member having a locking portion on the inner surface, a steel main body member, and a short pipe member;
(B) inserting and attaching the short tube member to the receiving member;
(C) forming a separation preventing portion at one end of the short tube member;
(D) a step of accommodating one end portion of the short tube member in which the separation preventing portion is formed in the receiving member; and (e) joining the main body member to a rear opening edge of the receiving member. And the manufacturing method of a pipe joint including the step which forms the said receptacle.   A pipe joint manufactured using the pipe joint manufacturing method according to claim 8. A pipe connection structure comprising: the pipe joint according to any one of claims 1 to 6; and a pipe bonded and joined to the other end of the short pipe portion of the pipe joint.

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