JP2018109417A - Pipe joint and connection structure of multi-layer pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint which has good workability, which prevents deviation and peeling of a covering layer, and which can prevent falling of a whole multi-layer pipe, and to provide a connection structure of a multi-layer pipe.SOLUTION: A joint pipe is a multi-layer pipe 10 comprising a conduit 11 in which an end part is inserted in a socket part, and a covering layer 12 for covering an outer peripheral surface of the conduit 11. The joint pipe includes: an in-core 3 inserted in the conduit 11; a first lock ring 4 fastened and fixed by fixing means to an exposed portion in which the outer peripheral surface of the conduit 11 is exposed; and a second lock ring 5 fastened and fixed by the fixing means to a covered portion in which the outer peripheral surface of the conduit 11 is covered by the covering layer 12. It also includes a connection mechanism 6 for connecting these lock rings when the first lock ring 4 and the second lock ring 5 are fastened and fixed in a state where the in-core 3 is located in the conduit 11 from the exposed portion to the covered portion continued to the exposed portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint and a multi-layer pipe connection structure. More specifically, a joint main body having a receiving portion into which the joining pipe is inserted, a packing attached to the receiving portion, a push ring that presses the packing against the receiving portion, and the push ring is fastened to the joint main body. The present invention relates to a pipe joint including at least a tightening means and a connection structure of multilayer pipes.

  2. Description of the Related Art Conventionally, for example, a multi-layer tube connection structure as described in Patent Document 1 is known. In this connection structure, a multi-layer pipe made of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with an FRP layer and a pipe joint are fitted and bonded with a filling type adhesive, and a filling type is provided between the FRP layer and the pipe joint. Bonded with an adhesive. However, when the conduit is a polyethylene tube, the connection structure using the adhesive as described above cannot be employed. Further, although it is conceivable to partially melt and bond the tube by heating, the work is complicated and the workability is extremely low.

  Therefore, as shown in FIG. 14, it is conceivable to apply a conventional mechanical pipe joint to the multilayer pipe 10 in which the conduit 11 is a polyethylene pipe. In such a case, the retaining ring 4 ′ is fastened and fixed to the conduit 11 of the multilayer tube 10, but the exterior material 12 cannot be tightened and fixed and is not bonded to the conduit 10. was there. In addition, when an unexpected load (water pressure) is applied, the polyethylene pipe is relatively flexible (stretchable / flexible), so that the polyethylene conduit 11 expands and the interior of the exterior material 12 that is not bonded is reinforced. In some cases, the layer 13 peeled off the conduit 11. Further, when a pulling force is generated in the polyethylene conduit 11, the conduit 11 extends, but the exterior material 12 not bonded to the conduit 11 cannot follow the elongation of the conduit 11, and the conduit 11 is exposed from the exterior material 12. However, there was also a risk that the strength would decrease.

JP 2003-207087 A

  In view of such a conventional situation, the present invention provides a pipe joint and a multi-layer pipe connection structure that have good workability, prevent displacement and peeling of the coating layer, and prevent the entire multi-layer pipe from coming off. With the goal.

  In order to achieve the above object, the pipe joint according to the present invention is characterized in that a joint body having a receiving part into which a joining pipe is inserted, a packing attached to the receiving part, and the packing as the receiving part. In the structure including at least a pressing wheel to be pressed and a tightening means for tightening the pressing wheel to the joint body, the joining pipe includes a conduit whose end is inserted into the receiving portion and a coating layer that covers an outer peripheral surface of the conduit. An in-core inserted into the conduit, a first retaining ring fastened and fixed by a fixing means to an exposed portion where the outer peripheral surface of the conduit is exposed, and an outer peripheral surface of the conduit A second retaining ring that is fastened and fixed by a fixing means to the covering portion covered with the covering layer, and the in-core extends from the exposed portion to the exposed portion in the conduit. In the state of being positioned at In further comprising a coupling mechanism for connecting the retaining ring one of the stop wheel and the second snap ring upon fastened.

  According to the above configuration, the target joining pipe is a multilayer pipe composed of a conduit whose end is inserted into the receiving portion and a coating layer covering the outer peripheral surface of the conduit. Then, the first snap ring fastened and fixed to the exposed portion where the outer peripheral surface of the conduit is exposed by the fixing means, and the fixing means is tightened and fixed to the covering portion where the outer peripheral surface of the conduit is covered with the coating layer. Since it has a 2nd retaining ring, the different location (layer) of a multilayer pipe is pressed with each retaining ring. Then, when the first retaining ring and the second retaining ring are fastened and fixed in a state where the in-core is positioned in the conduit from the exposed portion to the covering portion that continues from the exposed portion, the coupling that connects these retaining rings. Since the mechanism is provided, each layer is fastened and fixed to the in-core by each retaining ring, thereby preventing each layer from being displaced or peeled off. In addition, since the respective retaining rings are connected by a connecting mechanism, the entire multilayer tube can be prevented from coming off.

  The first retaining ring has a coupling portion having a through hole that penetrates the first coupling member fixed to the flange of the joint body, and the second retaining ring is a through hole that penetrates the second coupling member. The connection mechanism may include the first connection member, the second connection member, and a connection member that connects the connection members. Thereby, each connecting member may be passed through each through hole and connected by a connecting member, and workability is good.

  On the other hand, one of the first retaining ring and the second retaining ring has a projecting portion projecting outward, and the other retaining ring is erected outward and extends the projecting portion. It has a fitting part to be fitted, and the connection mechanism may be composed of the protruding part and the fitting part. Thereby, a protrusion part should just be inserted in an insertion part, and workability | operativity is good.

  In this case, it is preferable that the protruding portion is provided so that the longitudinal direction thereof is along the pipe circumferential direction of the conduit, and the fitting portion is formed along the pipe circumferential direction of the conduit. Thereby, what is necessary is just to rotate one retaining ring to a pipe circumferential direction relatively with respect to the other retaining ring, and also workability | operativity is good. In addition, the snap ring can be prevented from being detached in the tube axis direction simply by fitting the protruding portion into the fitting portion, so that the multilayer tube can be further prevented.

  The connection mechanism may include a movement restricting portion that restricts movement of the protruding portion or the fitting portion in the tube axis direction of the conduit. Also by this movement restricting portion, the retaining ring can be prevented from detaching in the tube axis direction, and the multilayer tube can be further prevented from being pulled out.

  A tooth portion that bites into the exposed portion is provided inside the first retaining ring, and a protrusion that presses the covering portion is provided inside the second retaining ring. desirable. Since the tooth portion bites into the exposed portion of the conduit and the projection presses the covering portion of the conduit, it is possible to more firmly prevent the entire multilayer tube from being removed.

  At least one of the first retaining ring and the second retaining ring may have a C-ring shape, and at least one of the first retaining ring and the second retaining ring may be divided into a plurality of parts. You may be comprised by the body.

  In the multilayer pipe to which the present invention is applied, for example, the conduit is a polyethylene pipe, and the covering layer includes a reinforcing layer that reinforces the polyethylene pipe and an anticorrosive layer that covers the reinforcing layer.

  In order to achieve the above object, the connection structure of the multilayer pipe according to the present invention is characterized in that the multilayer pipe having a coating layer on the outer peripheral surface of the conduit is connected to another pipe or a pipe joint. A joint body into which an end portion is inserted; an in-core inserted into the conduit; a first retaining ring fastened and fixed to the exposed portion where the outer peripheral surface of the conduit is exposed; and an outer periphery of the conduit A second retaining ring whose surface is fastened and fixed by a fixing means to the covering portion covered with the covering layer, and the in-core extends from the exposed portion to the exposed portion and extends over the covering portion. It is provided with a connecting mechanism for connecting the first retaining ring and the second retaining ring when the first retaining ring and the second retaining ring are fastened and fixed in a state where they are positioned in the conduit.

  According to the features of the pipe joint and multilayer pipe connection structure according to the present invention, the workability is good, the covering layer is prevented from being displaced and peeled, and the multilayer pipe can be prevented from coming off.

  Other objects, configurations, and effects of the present invention will become apparent from the following embodiments of the present invention.

It is a perspective view of a pipe joint concerning a first embodiment of the present invention. FIG. 2 is an exploded perspective view of FIG. 1. It is a front view of a 1st snap ring. It is a front view of a 2nd retaining ring. It is a cross-sectional view of a pipe joint. It is a front view before the fastening of the first retaining ring and the second retaining ring. It is a front view after the fastening of the first snap ring and the second snap ring. It is a perspective view explaining the connection process of a multilayer pipe, and shows the state which temporarily attached the 2nd retaining ring to the coating layer of a multilayer pipe before insertion in the coupling main body of a conduit | pipe. It is a perspective view explaining the connection process of a multilayer pipe, and shows the state which inserted the conduit | pipe into the receiving part of the joint main body, and fastened and fixed the 1st retaining ring before the fastening fastening of the 2nd retaining ring. It is a perspective view which shows 2nd embodiment of this invention. FIG. 6 is a view corresponding to FIG. 5 in the second embodiment of the present invention. It is a perspective view which shows 3rd embodiment of this invention. FIG. 6 is a view corresponding to FIG. 5 in the third embodiment of the present invention. It is a cross-sectional view of the connection structure of the multilayer pipe to which the conventional mechanical pipe joint is applied.

Next, the first embodiment of the present invention will be described in more detail with reference to FIGS.
As shown in FIGS. 1 and 2, a pipe joint 1 serving as a connection structure for multilayer pipes 10 according to the present invention includes a joint body 2 into which one end of a conduit 11 of a multilayer pipe 10 as a joining pipe is inserted. The in-core 3 inserted into the conduit 11, the C-ring-shaped first retaining ring 4 fastened and fixed by the fixing means 49 to the exposed portion 10a where the outer peripheral surface of the conduit 11 is exposed, and the outer peripheral surface of the conduit 11 are covered. A C-ring-shaped second retaining ring 5 is fastened and fixed to the covering portion 10b covered with the layer 12 by fixing means 59. The first and second retaining rings 4 and 5 are connected to each other by a connecting mechanism 6 which will be described later in a state of being fastened and fixed to the multilayer pipe 10. In addition, the pipe joint 1 includes a packing 7 attached to the receiving portion 21 and a push ring 8 that presses the packing 7 against the receiving portion 21.

  As shown in FIGS. 2 and 5, the multilayer tube 10 in this embodiment includes a conduit 11 whose end is inserted into the receiving port 21 and a coating layer 12 that covers the outer peripheral surface of the conduit 11. The covering layer 12 includes a reinforcing layer 13 that reinforces the conduit 11 and an anticorrosion layer 14 that covers the reinforcing layer 14. In this embodiment, the conduit 11 is a high-density polyethylene pipe, the reinforcing layer 13 is a reinforcing tape made of aramid fibers, and the anticorrosion layer 14 is a low-density polyethylene exterior material. The reinforcing tape 13 is not bonded to the conduit 11 and the anticorrosion layer 14.

  As shown in FIGS. 1, 2, and 5, the joint body 2 generally has a tapered receiving portion 21 to which the packing 7 is attached and a cavity 22 in which the end of the multilayer tube 10 (conduit 11) is positioned. A substantially rectangular flange 23 is provided on the outer periphery. A first through hole 24a through which a T-type bolt as the first connecting member 61 is inserted and a T-type bolt 9 through which the presser wheel 8 and the first retaining ring 4 are connected and fixed are passed through the corners of the flange 23. The through holes 24b are arranged opposite to each other diagonally.

  As shown in FIG. 5, the in-core 3 is fitted into the conduit 11 from the exposed portion 10a where the outer peripheral surface of the conduit 11 of the multilayer tube 10 is exposed to the covering portion 10b continuous from the exposed portion 10a. .

  As shown in FIGS. 1, 3, 6, and 7, the first retaining ring 4 includes a ring body 40 having a C-ring shape, four connecting portions 41 to 44 protruding from the outer peripheral surface, and both ends of the ring body 40 A pair of projecting pieces 45, 45 projecting outward from. The projecting piece 45 is provided with a substantially circular through hole 45a through which a bolt 49a as a fixing means 49 is inserted.

  Here, in this embodiment, in the vicinity of one projecting piece 45 (in the example of FIG. 3, the right side in the drawing) with respect to the insertion direction of the multilayer tube 10 into the receiving portion 21 among the four connecting portions 41 to 44. A T-shaped bolt as a first connecting member 61 is provided in the connecting portion 43 provided at a position that is substantially point-symmetric with the connecting portion 41 with respect to the center of the connecting portion 41 and the ring body 40 (positioned diagonally). To penetrate. The connecting portion 44 located in the vicinity of the other protrusion 45 (the left side in the drawing in the example in the drawing) and the center of the ring body 40 are provided at positions that are substantially point-symmetric with the connecting portion 44 (positioned diagonally) ) The connecting portion 42 is inserted with a T-bolt 9 for connecting and fixing the push wheel 8 and the first retaining ring 4.

  The through holes 41 a and 44 a of the connecting portions 41 and 44 adjacent to the projecting piece 45 are not circular but have a long hole so as to allow the diameter of the ring body 40 to be reduced by tightening the fixing means 49. On the other hand, the through holes 42a and 43a of the connecting portions 42 and 43 separated from the projecting piece 45 are not greatly affected by the diameter reduction of the ring main body 40 due to the fastening of the fixing means 49, and thus are substantially circular rather than long holes. . An annular tooth portion 46 is formed on the inner surface of the ring main body 40 to suppress slippage of the conduit 11 by biting into the exposed portion 10a of the conduit 11 during fastening. Further, since the incore 3 is inserted (positioned) inside the conduit 11, the tooth portion 46 bites into the conduit 11, and the conduit 11 is sandwiched between the tooth portion 46 and the incore 3. Thereby, the separation preventing force that the conduit 11 does not separate from the joint body 2 is improved.

  As shown in FIGS. 1, 2, 4, 6, and 7, the second retaining ring 5 is similar to the first retaining ring 4, and includes a ring body 50 having a C-ring shape and two couplings protruding from the outer peripheral surface thereof. The parts 51 and 52 and a pair of projecting pieces 53 and 53 projecting outward from both ends of the ring main body 50 are provided. The protruding piece 53 has the same configuration as the protruding piece 45 of the first retaining ring 4. The connecting portions 51 and 52 are arranged point-symmetrically (on the diagonal line) with respect to the tube center and face the connecting portions 41 and 43 of the first retaining ring 4 in the tube axis direction as shown in FIGS. Further, the connecting portions 51 and 52 are provided with through holes 51a and 52a through which the hexagon bolt 62 as the second connecting member is passed. At least the through hole 51a of the connecting portion 51 in the vicinity of the projecting piece 53 is formed as a long hole equivalent to the through holes 41a and 44a of the connecting portions 41 and 44 of the first retaining ring 4. The through hole 52 a of the other connecting portion 52 is not affected by the diameter reduction of the ring body 50 due to the fastening of the fixing means 59, and may be a circular hole instead of a long hole. A projecting portion 54 is formed on the inner surface of the ring body 50 to press the covering portion 10b of the conduit 11 when tightened and fixed. Thereby, the holding force which prevents the in-core 3, the conduit | pipe 11, the reinforcement layer 13, and the anticorrosion layer 14 from shifting | deviating from a predetermined position is improved.

  In the present embodiment, the connecting mechanism 6 that connects the first retaining ring 4 and the second retaining ring 5 is, as shown in FIGS. It comprises a hexagon bolt 62 as a connecting member, a long nut 63 as a connecting member for connecting these bolts 61 and 62, and a washer 64.

  Here, the first retaining ring 4 needs to have a detachment preventing force that does not detach from the joint body 2 even if a pressure higher than the breaking pressure or a pulling force is generated in the conduit 11 in which the incore 3 is inserted. On the other hand, the second retaining ring 5 only needs to have a holding force that prevents the in-core 3, the conduit 11, the reinforcing layer 12, and the anticorrosive layer 14 that are not bonded to each other from deviating from a predetermined position. Good. Therefore, as shown in FIG. 5, the tube axial direction width of the first retaining ring 4 (ring body 40) may be larger than the tube axial direction width of the second retaining ring 5 (ring body 50). However, it is not always necessary to satisfy the above relationship as long as the above-described separation prevention force and holding force are exhibited.

  In addition, as shown in FIG. 5, the in-core 3 may be inserted so that the tip thereof is located away from the end of the second retaining ring 5. As shown in FIG. 5, in the present embodiment, the first retaining ring 4 and the second retaining ring 5 are fastened and fixed in a state of contact (no gap), but a slight gap is allowed. The The slight gap refers to a gap where the conduit 11 does not expand from the gap when an internal pressure is applied to the conduit 11.

  As shown in FIGS. 2 and 5, the packing 7 has an annular shape, and the outer peripheral surface of the packing 7 faces the receiving portion 21 and the push wheel 8 of the joint body 2. The press ring 8 has an annular shape, and includes a first through hole 81 through which a T-type bolt 61 as a first connecting member passes, and a T-type bolt 9 that connects and fixes the joint body 2 to the first retaining ring 4 and the press ring 7. A rib 80 having a second through hole 82 to be penetrated is provided. The push ring 8 presses the packing 7 against the receiving portion 21 of the joint body 2 by tightening the T-type bolt 9 and the T-type bolt 61 as the first connecting member, and ensures the water tightness and the tube holding force by the packing 7. Thus, in the present embodiment, the T-type bolt 9 and the T-type bolt of the first connecting member 61 function as fastening means for fastening the presser wheel 8 to the joint body 2.

Next, the construction procedure will be described with reference to FIGS.
First, the packing 7 is attached to the receiving portion 21 of the joint body 2, and the T-type bolt 61 as the first connecting member is inserted into the first through hole 81 of the push ring 8 and the through holes 41 a and 43 a of the first retaining ring 4. At the same time, the T-type bolt 9 is inserted into the second through hole 82 of the push ring 8 and the through holes 42 a and 44 a of the first retaining ring 4. Then, a washer 64 is attached to the T-shaped bolt 61 and temporarily tightened with the long nut 63, and a washer is attached to the T-shaped bolt 9 and temporarily tightened with the cap nut 9a. Thereby, the joint main body 2, the packing 7, the presser wheel 8, and the first retaining ring 4 are connected.

  On the other hand, as shown in FIG. 8, first, at one end of the multilayer tube 10, the covering layer 12 is peeled off to expose the outer peripheral surface of the conduit 11, and an exposed portion 10a is provided. The in-core 3 is inserted into the conduit 11 and inserted into the receiving portion 21 of the joint body 2. Then, as shown in FIG. 9, the fixing means 49 of the first snap ring 4 is tightened to reduce the diameter of the ring body 40, and the tooth portion 44 is bitten into the exposed portion 10a of the conduit 11 to be fastened and fixed (this book) Tighten). At the same time, the T-type bolt 61 and the long nut 63, the T-type bolt 9 and the cap nut 9 b are tightened, and the packing 7 is brought into close contact with the receiving portion 21 of the joint body 2 through the pusher wheel 8.

  Next, the second retaining ring 5 is slid on the multilayer tube 10 to be brought into contact with the first retaining ring 4, and a washer 64 is attached to a hexagon bolt 62 as a second connecting member. The through holes 51 a and 52 a are penetrated and screwed into the long nut 63. Thereby, the 1st retaining ring 4 and the 2nd retaining ring 5 are connected. Then, the fixing means 59 of the second retaining ring 5 is tightened to reduce the diameter of the ring main body 50, and the protrusion 54 is pressed against the covering portion 10b to be fastened and fixed. In this way, the first and second retaining rings 4 and 5 can be connected and fixed by screwing the bolts 61 and 62 to the long nut 63, so that the workability is high and the structure is simple.

Finally, the possibilities of other embodiments of the invention will be described. In the following embodiments, the same reference numerals are given to the same members as those in the above-described embodiments.
In the first embodiment, the connecting mechanism 6 that connects the first retaining ring 4 and the second retaining ring 5 is configured by a T-shaped bolt 61, a hexagonal bolt 62, and a long nut 63. However, the connection mechanism 6 is not limited to this.

  For example, in the second embodiment shown in FIGS. 10 and 11, the ring main body 40 ′ of the first snap ring 4 is provided with a protruding portion 47 that protrudes outward, and the ring main body 50 ′ of the second snap ring 5 is provided. It is also possible to provide a fitting portion 56 that is erected outward and into which the protruding portion 47 of the first retaining ring 4 is fitted, and thereby constitutes the coupling mechanism 6 ′. In this case, the protruding portion 47 is formed in a plate shape so that the longitudinal direction thereof is along the pipe circumferential direction of the conduit 11. Similarly, the insertion portion 56 is formed so that the longitudinal direction thereof is along the pipe circumferential direction of the conduit 11, and the groove portion 57 is provided along the pipe circumferential direction. One of the groove portions 57 is provided with a wall portion 57a, but the other is opened. When the first and second retaining rings 4 and 5 are connected (constructed), the second retaining ring 5 is brought into contact with the first retaining ring 4 so that the second retaining ring 5 is placed on the covering portion 10b. The protrusion 47 is inserted into the groove 57 of the insertion portion 56 by rotating in the pipe circumferential direction. Completion of the rotation work of the second retaining ring 5 can be grasped by the protrusion 47 contacting the wall 57a. The fitting portion 56 functions as a movement restricting portion that restricts the movement of the protruding portion 47 in the tube axis direction and prevents the first retaining ring 4 from being detached.

  Moreover, in each said embodiment, although the 1st retaining ring 4 and the 2nd retaining ring 5 were formed in C ring shape, the shape of the 1st, 2nd retaining rings 4 and 5 is not restricted to this. For example, in the third embodiment shown in FIGS. 12 and 13, the second retaining ring 5 can be configured by split bodies 50 </ b> A and 50 </ b> B that are substantially symmetrical. In such a case, unlike the second embodiment, there is no need to rotate the second retaining ring 5 on the multilayer pipe 10, so that the groove portion 57 ′ of the fitting portion 56 ′ is open at both ends thereof and is provided with a wall portion 57a. Absent. Of course, it is also possible to provide the wall part 57a.

  In the second and third embodiments, the first retaining ring 4 is provided with the protruding portion 47 and the second retaining ring 5 is provided with the fitting portion 56. However, the first retaining ring 4 is provided with the fitting portion 56, You may provide the protrusion part 47 in the 2nd retaining ring 5. FIG. In addition, the second retaining ring 5 of the first embodiment can also be configured by split bodies 50A and 50B that are substantially symmetrical as in the third embodiment. Thus, the above embodiments can be implemented in combination.

  Further, in the second and third embodiments, the longitudinal direction of the projecting portion 47 (47 ′) and the fitting portion 56 (56 ′) is formed along the pipe circumferential direction. As long as it has a connection strength and a tube holding force that do not allow the retaining rings 4 and 5 to be detached when the ring 5 is tightened and fixed, it is not limited to the connection mode of each of the above embodiments. For example, the longitudinal direction of the protrusion 47 (47 ′) and the fitting portion 56 (56 ′) is formed along the tube axis direction, and a through-hole through which a pin is inserted is provided, and the connection is held by the pin. It is also possible to configure. In addition, it is possible to adopt a mode in which the tip of the projecting portion 47 (47 ') is formed in, for example, a hook shape and hooked on the fitting portion 56 (56'). The hooking means such as pins and hooks serve as a movement restricting portion that restricts the movement of the connecting mechanism 6 in the tube axis direction of the conduit 11.

  In each of the above-described embodiments, the example in which four connection portions 41 to 44 are provided in the ring main body 40 of the first retaining ring 4 and the four T-type bolts 9 and 61 are used has been described, but the present invention is not limited thereto. Further, in the second retaining ring 5 of the first embodiment, the flange portions 51 are provided at two points symmetrical about the tube axis. However, the present invention is not limited to this, and it is possible to provide three or more locations. However, the above embodiment is excellent in that the structure is complicated.

  In the above embodiments, the present invention has been described as a pipe joint. However, the present invention can also be expressed as a multi-layer pipe connection structure 1 that connects the multi-layer pipe 10 having the coating layer 12 on the outer peripheral surface of the conduit 11 and another pipe or pipe joint. In such a case, the connection structure 1 of the multi-layer pipe 10 has an exposed joint body 2 into which an end portion of the conduit 11 is inserted, an in-core 3 inserted into the conduit 11, and an outer peripheral surface of the conduit 11 exposed. A first retaining ring 4 that is fastened and fixed to the portion 10a by a fixing means, and a second stopper that is fastened and fixed to the covering portion 10b in which the outer peripheral surface of the conduit 11 is covered with the covering layer 12 by the fixing means. The first retaining ring 4 and the second retaining ring 4 in a state in which the in-core 3 is positioned in the conduit 11 from the exposed portion 10a to the covering portion 10b continuous to the exposed portion 10a. A connecting mechanism 6 is provided for connecting the retaining rings when the second retaining rings 5 are fastened and fixed.

  The present invention can be applied to, for example, an aramid-coated polyethylene pipe in which a reinforcing tape made of aramid fiber is wound around a high-density polyethylene conduit, and a low-density polyethylene anticorrosion layer is provided thereon. Moreover, it is not restricted to these materials, It can utilize as a pipe joint and connection structure of the multilayer pipe of another material. However, it is preferably used for a pipe joint (connection structure) of a multi-layer pipe using a polyethylene pipe having stretchability and flexibility as a conduit.

DESCRIPTION OF SYMBOLS 1,1 ': Pipe joint (connection structure), 2: Joint main body, 3: In-core, 4: First retaining ring, 4': Retaining ring, 5: Second retaining ring, 6, 6 ', 6' ': Coupling mechanism, 7: packing, 8: push ring, 9: T-type bolt (tightening means), 9a: cap nut, 10, 10': multilayer pipe, 10a: exposed part, 10b: covering part, 11: conduit (High density polyethylene pipe), 12: Covering layer (exterior material), 13: Reinforcing layer (reinforcing tape), 14: Anticorrosive layer (low density polyethylene layer), 21: Receiving part, 22: Air cavity, 23: Flange 24a: first through hole, 24b: second through hole, 40, 40 ': ring main body, 41-44: connecting portion, 41a-44a: through hole, 45: projecting piece, 45a: through hole, 46: tooth Part, 47: projecting part, 49: fixing means, 49a: bolt, 49b: nut, 50, 50 ', 50A, 50B: 51, 52: connecting portion, 51a, 52a: through hole, 53, 53A, 53B: protruding piece, 53a: through hole, 54: protruding portion, 56, 56 ': insertion portion (movement restricting portion), 57 57 ′: groove part, 57a: wall part, 59: fixing means, 59a: bolt, 59b: nut, 61: first connecting member (T-type bolt (tightening means)), 62: second connecting member (hexagon bolt) 63: connecting member (long nut), 64: washer, 69: fixing means, 69a: bolt, 69b: nut, 80: rib, 81: first through hole, 82: second through hole

Claims (10)

A joint main body having a receiving portion into which a joining pipe is inserted; a packing attached to the receiving portion; a push ring that presses the packing against the receiving portion; and a fastening means that fastens the push ring to the joint main body. A pipe joint comprising at least
The joint pipe is a multilayer pipe composed of a conduit inserted into the receiving portion at the end and a coating layer covering the outer peripheral surface of the conduit,
An incore inserted into the conduit;
A first snap ring fastened and fixed by a fixing means to an exposed portion exposing the outer peripheral surface of the conduit;
A second retaining ring that is fastened and fixed by a fixing means to a covering portion covered with the covering layer on an outer peripheral surface of the conduit;
When the first retaining ring and the second retaining ring are fastened and fixed in a state where the in-core is positioned in the conduit from the exposed part to the covering part that continues from the exposed part, these stoppers are stopped. A pipe joint provided with a connecting mechanism for connecting rings. The first retaining ring has a coupling portion having a through hole that penetrates the first coupling member fixed to the flange of the joint body, and the second retaining ring is a through hole that penetrates the second coupling member. 2. The pipe joint according to claim 1, wherein the coupling mechanism includes the first coupling member, the second coupling member, and a connection member that connects the coupling members. One of the first retaining ring and the second retaining ring has a protruding portion that protrudes outward, and the other retaining ring is erected outward to fit the protruding portion. The pipe joint according to claim 1, further comprising a fitting portion, wherein the coupling mechanism includes the projecting portion and the fitting portion. The pipe joint according to claim 3, wherein the protruding portion is provided such that a longitudinal direction thereof is along a pipe circumferential direction of the conduit, and the fitting portion is formed along a pipe circumferential direction of the conduit. The said coupling mechanism is a pipe joint of Claim 3 which has a movement control part which controls the movement to the pipe-axis direction of the said conduit | pipe of the said protrusion part or the said insertion part. A tooth portion that bites into the exposed portion is provided inside the first retaining ring, and a protrusion that presses the covering portion is provided inside the second retaining ring. The pipe joint in any one of 1-5. The pipe joint according to any one of claims 1 to 6, wherein at least one of the first retaining ring and the second retaining ring has a C-ring shape. The pipe joint according to any one of claims 1 to 6, wherein at least one of the first retaining ring and the second retaining ring comprises a plurality of divided bodies. The pipe joint according to any one of claims 1 to 8, wherein the conduit is a polyethylene pipe, and the covering layer includes a reinforcing layer that reinforces the polyethylene pipe and an anticorrosive layer that covers the reinforcing layer. A multi-layer pipe connection structure for connecting a multi-layer pipe having a coating layer on the outer peripheral surface of the conduit and another pipe or pipe joint,
A coupling body into which the end of the conduit is inserted;
An incore inserted into the conduit;
A first snap ring fastened and fixed by a fixing means to an exposed portion exposing the outer peripheral surface of the conduit;
A second retaining ring that is fastened and fixed by a fixing means to a covering portion covered with the covering layer on an outer peripheral surface of the conduit;
When the first retaining ring and the second retaining ring are fastened and fixed in a state where the in-core is positioned in the conduit from the exposed part to the covering part that continues from the exposed part, these stoppers are stopped. A multi-layer pipe connection structure including a connection mechanism for connecting the rings.

Images