WO2004099659A2 - 管継手 - Google Patents
管継手 Download PDFInfo
- Publication number
- WO2004099659A2 WO2004099659A2 PCT/JP2004/006250 JP2004006250W WO2004099659A2 WO 2004099659 A2 WO2004099659 A2 WO 2004099659A2 JP 2004006250 W JP2004006250 W JP 2004006250W WO 2004099659 A2 WO2004099659 A2 WO 2004099659A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- pipe
- swelling
- joint
- pipe joint
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/0036—Joints for corrugated pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0462—Tubings, i.e. having a closed section
- H02G3/0468—Corrugated
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
Definitions
- the present invention relates to a pipe joint for connecting pipes for protecting, for example, a power cable, a communication cable, and the like installed underground.
- Patent Document 1 discloses a pipe joint with a watertight seal sheet, Japanese Utility Model Publication No. 7-52467 (U.S. Patent No. 2,133,706).
- the above-mentioned water-tight sealing fiber sheet 80 is formed by converting a water-swellable resin material 81 into a powdery fiber 82.
- the bonding strength between the water-swellable powdery resin material 81 and the fiber 82 is low because it is included in or contained in the fiber 82 and attached to the outer peripheral surface.
- the water-swellable powdery resin material 81 ⁇ , so-called water-swellable resin powder particles
- absorbs water and expands absorbs water and expands, the resin powder particles 81 are separated from the fibers 82 and fall off. Therefore, it cannot be reused after it has been used once, and there has been a problem of what is called a disposable type.
- reference numeral 83 denotes a joint body.
- a pipe joint with a watertight sealing sheet of Patent Document 1 and a short pipe for forming a central portion at the center of the pipe joint are provided on one side and the other side of the short pipe at the center, respectively.
- the short cylinders for forming both ends are rotatably connected, and the short cylinder on one side is integrally formed with spiral ridges with a trapezoidal cross section, and the short cylinder on the other side has spiral ridges with a semicircular cross section.
- the connecting part Patent No. 2 in which an inflatable body (so-called water inflatable part) that absorbs moisture and expands is integrally molded on the surface facing the tube in
- the pipe joint portion which is a connecting portion between the pipe bodies, has high waterproofness.
- a watertight sealing fiber sheet is attached to a portion where a pipe body is connected.
- the attachment is made of a forming material 101 for forming a connection portion of a pipe joint.
- the watertight sealing fiber sheet 102 and the forming material are welded and integrated while a part of the watertight sealing fiber sheet 102 is inserted.
- the molten forming material is injected toward the watertight sealing fiber sheet 102 attached to the mold to form the connection part of the pipe joint (injection molding).
- the water-tight sealing fiber sheet is formed by adhering and holding the powdery and granular water-absorbing resin material on the outer peripheral surface of the fiber as described above, the heat and pressure of the molten resin are increased. Susceptible to power.
- the hatched portions indicated by broken lines are the portions affected by the molten resin. For this reason, the water-swellable resin material 103 may be degraded, etc., and may not sufficiently fulfill its original role (water expansion).
- the watertight sealing fiber sheet is made of a non-woven fabric and has a structure in which it can be expanded and contracted in the thickness direction, that is, has a fluffy thickness. There is a possibility that a homogeneous portion may be generated or a portion having a poor water swelling function may be immediately formed. Furthermore, when the water-swellable resin material 103 randomly incorporated into the forming material 101 expands, the strength and life of the connecting portion may be affected.
- the watertight sealing fiber sheet 102 is formed by adhering and holding a powdery and water-swellable resin material 103 on the outer peripheral surface of the fiber.
- the water-absorbing swellable resin material 103 is in a state where it is easily dropped by an external force.
- the resin material 103 is bonded to the fiber with an adhesive, as shown by the phantom line in the figure, when the resin material 103 absorbs water, the volume of the resin material 103 increases by several tens of times or more. Therefore, the adhesion is easily released, and the surface force of the watertight sealing fiber sheet 102 easily falls off. If the resin material 103 falls off before connection, the water stop function will be affected, and the intended purpose may not be achieved.
- the watertight sealing fiber sheet 102 expands, it becomes jelly-like, so that it is in a state of falling off even with a slight external force.
- the watertight sealing fiber sheet 102 is expanded, When the resin material 103 that is important for water stoppage comes off and is removed again immediately after removal, the sufficient waterstop function will not be achieved even if the pipe is connected again.
- the water-swellable resin is generally expensive, and the structure composed of only the watertight sealing fiber sheet as described above cannot be manufactured inexpensively because of its large amount of use.
- a water-tight sealing fiber sheet made of a water-absorbing and expanding resin material uniformly distributed over the entire circumference in the circumferential direction is wound into a substantially cylindrical shape, and the inner circumference of the short pipe portion is formed.
- the pipe joint with a watertight sealing sheet of Patent Document 1 integrally molded on the surface is made up of a fiber sheet material by abutting both ends of a watertight sealing fiber sheet wound in a substantially cylindrical shape in the circumferential direction.
- Patent Literature in which a sheet-like water-tight seal body in which water-swelling resin powder is uniformly distributed on a fibrous body to be wound is wound into a substantially cylindrical shape, and is formed over the entire inner peripheral surface of the short tube portion.
- both ends of the water-tight seal wound in a substantially cylindrical shape are merely abutted in the circumferential direction, both ends of the water-tight sealing fiber sheet and the water-tight seal are overlapped.
- water running water leakage
- Patent Document 1 Japanese Utility Model Publication No. 7-52467 (Utility Model Registration No. 2133706)
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-333086
- Patent Document 3 JP 2003-74770 A
- Patent Document 4 Japanese Utility Model Publication No. 8-9510 (Utility Model Registration No. 2146217)
- An object of the first embodiment of the present invention is that a water-swelling fiber or a liquid water-absorbing resin hardly falls off from a nonwoven fabric base material, and that even a pipe joint that has been used once and expanded by water absorption can be reused.
- the purpose of the present invention is to provide a pipe joint that can be used.
- An object of the second embodiment of the present invention is to form a substantially uniform clearance between the outer peripheral surface of the pipe body and the water expanding portion when the pipe body is connected with the joint body, thereby mounting the joint body. Removal is easy, connection operability of the fitting body is improved, and if there is a bent In this case, the connection between the pipe body and the pipe joint is easy, and the above-mentioned clearance secures a water passage that allows water and moisture to infiltrate positively. It is intended to provide a pipe joint that can be obtained.
- An object of a third embodiment of the present invention is to make it possible to reliably perform water stoppage due to water expansion, to obtain such a product relatively easily and at a lower cost, and to obtain a stable product.
- the main task is to be able to meet the needs.
- An object of a fourth embodiment of the present invention is to enable a reliable water stopping function to be stably obtained, to be able to be used again, and to be able to be manufactured at a lower cost. Main issues.
- An object of a fifth embodiment of the present invention is to connect a pipe body by forming both ends of a water expanding portion on the inner peripheral surface of a pipe joint in a state of being formed into a substantially uniform thickness.
- An object of the present invention is to provide a pipe joint capable of performing work easily and easily and preventing entry and penetration of moisture.
- the pipe joint according to the first embodiment of the present invention is a pipe joint provided with a joint main body for connecting ends of a pipe body, wherein a resin base fiber as a base material and a high-melting-point water expansion are provided.
- the resin material is processed into a non-woven fabric using the water-swelling fibers that have been fiberized and a binder, and a water-swelling portion is formed by bonding the base fibers and the water-swelling fibers with the binder that has been melted by the heat generated during the processing.
- the water expansion portion is integrated with a surface of the joint body facing the tube.
- the water-swelling fiber obtained by fiberizing the high-melting-point water-swelling material having the above structure is a material that cannot be melted by heat during processing.
- Bel Oasis registered trademark, a product of Kanebo Synthetic Co., Ltd.
- PET fiber or PE fiber may be used as the base fiber, and a binder that is melted by heat during processing, such as low-melting PET, may be used as the binder.
- the water-expandable portion is formed by bonding the base fiber and the water-expandable fiber with the binder melted by heat during processing, the water-expandable fiber almost falls off the nonwoven fabric base material.
- the water-swelling fiber expands by absorbing water, the dropout of the water-swelling fiber is extremely small.
- the pipe joint according to the present invention is also a pipe joint provided with a joint body continuing an end of a pipe body, wherein a resin base fiber as a base material and a low-melting water-swelling resin material are fibers.
- Water-expanded fibers are processed into a non-woven fabric using the expanded water-expanded fibers, and the water-expanded fibers softened by heat during processing form a water-expanded portion bonded to the base fiber, and are opposed to the tube of the joint body.
- the water swelling portion is integrated with the surface.
- the water-expandable fiber in which the low-melting-point water-expandable material having the above structure is fibrillated is softened by heat during processing.
- Lanseal registered trademark, a product of Toyobo Co., Ltd.
- the base fiber may be PET fiber or PE fiber.
- the water-swelling portion since the water-swelling portion has the water-swelling fiber softened by heat during processing bonded to the base fiber, the water-swelling fiber hardly falls off the nonwoven base material. Also, even when the water-swelling fiber expands by absorbing water, the dropout of the water-swelling fiber is extremely small.
- the pipe joint according to the present invention is a pipe joint further provided with a joint main body for connecting an end portion of a pipe body, wherein the non-woven fabric is processed into a non-woven fabric using a resin base fiber as a base material.
- a water-swelling portion impregnated with a liquid water-absorbent resin is formed on the surface of the joint body, and the water-swelling portion is integrated with a surface of the joint body facing the tube.
- PET fiber or PE fiber may be used as the base fiber having the above configuration, and Etaos (trade name, product of San Ado Corporation) may be used or used as the liquid water-absorbing resin.
- the water-swelling portion is formed by impregnating the nonwoven fabric made of the base fiber with the liquid water-absorbing resin and firmly bonding the two, the water-swelling fiber is almost completely separated from the nonwoven base material. Even if the resin does not fall off, and the water-absorbing resin expands by absorbing water, the falling off of the water-absorbing resin is extremely small.
- a clearance for water circulation is formed between the water expanding portion and the pipe.
- the clearance in the above configuration may be set to any value between 0.2mm and 5. Omm, corresponding to the outer diameter of the pipe.
- the clearance is formed between the water expanding portion and the pipe at both the time before the water expansion and the time of the drying after the water expansion, so that the pipe joint is attached and detached. Can be performed extremely smoothly and easily.
- the contact resistance between the water-expanded part and the pipe body is small both when attaching and detaching the pipe joint, which further reduces the detachment of the water-expandable fiber and liquid water-absorbent resin due to mechanical external force.
- the reusability of pipe joints is further improved.
- a pipe joint according to a second embodiment of the present invention is a pipe joint provided with a joint main body for connecting ends of a pipe having spiral concave and convex strips, and an inner peripheral surface of the joint main body has water expansion.
- a substantially uniform clearance is formed between the outer peripheral surface of the tubular body and the water expanding portion when the tubular body is connected by the joint body.
- the water expansion section having the above structure absorbs water and expands to stop water between the pipe and the joint body.
- the above clearance may be set to any value between 0.2mm and 5. Omm according to the outer diameter of the pipe.
- a value obtained by dividing the inner diameter of the joint body including the water expanding section by the outer diameter of the ridge of the spiral concave ridge of the pipe is set to less than 1.0. It is.
- a spiral ridge is formed on the joint main body to be screwed with the spiral concave and convex ridges of the tubular body.
- the convex end of the spiral ridge in the radially inward direction of the joint body (provided that the convex end does not include the water expansion portion) is adjacent to the spiral ridge of the tubular body. Since the ridge ends overlap in the radial direction, sufficient tensile strength (pull-out strength) can be secured.
- a projection for connection operation is provided on the outer peripheral side of the joint main body.
- One or more of the protrusions having the above-described configuration may be integrally formed on the outer peripheral side of the joint body. According to the above configuration, the protrusion prevents the operator's hand from slipping during the connection operation. As a result, the attachment and detachment operation of the pipe joint can be facilitated.
- the number of spiral ridges in the axial direction of the joint main body is set to 218.
- the pipe joint according to the third embodiment of the present invention has a connecting portion that connects the ends of the tubular body, and water that expands by absorbing moisture to the outer layer side of the connected portion facing the tubular body.
- the holding interposition portion is located closer to the interior side, that is, the connection portion side than the water expanding portion,
- the water swelling portion is integrated with the connection portion while being prevented from being confined by the forming material forming the connection portion or being affected by heat or pressure.
- the holding interposition portion is located in a space closer to the inner layer than the water expansion portion, and reduces the required volume of the water expansion portion. In other words, its use reduces the usage of the water expanding portion.
- the holding interposition portion may be formed of a separate sheet-shaped member, and may be integrated with the water expanding portion in advance before forming the connection portion.
- rubber glue or the like may be bonded using an adhesive or another member such as sewing. If the intervening part for holding and the water-swelling part are nonwoven fabrics, heat compression or needle An appropriate method such as punching can be adopted.
- the holding interposition portion is formed of a nonwoven fabric. This is because the nonwoven fabric can easily obtain the required properties (properties, flexibility, thickness, etc.), and can be strongly bonded to the molten resin by allowing the molten resin to enter the nonwoven fabric fibers.
- an exterior part covering the water swelling part may be provided.
- the exterior part covers the water inflatable part and covers the water inflatable part before and after the water inflate to protect the water inflatable part.
- the water expansion section may be provided partially with respect to the connection section.
- the arranging portion is a portion that easily comes into contact with moisture, for example, an outer end of the connecting portion.
- the pipe joint according to the fourth embodiment of the present invention has a connecting portion that connects the ends of the tubular body, and expands by absorbing moisture to the outer layer side of the connected portion facing the tubular body.
- Another embodiment of the present invention has a connecting portion for connecting the ends of the tubular body, and a water-swelling portion that expands by absorbing moisture is held on an outer layer side of the connecting portion facing the tubular body.
- the water-swelling portion is formed by mixing a powdery or granular water-swelling material into a nonwoven fabric or by forming a fibrous water-swelling material into a nonwoven fabric, and forming an outer layer side of the water-swelling portion.
- the pipe joint is provided with an exterior part that covers the water expansion part and prevents the water expansion material from falling off.
- the exterior portion covers the water-swelling portion, protects the water-swelling portion itself and the water-swelling material constituting the water-swelling portion, and prevents falling off.
- the exterior part is provided on the outer layer side of the water swelling part, and reduces the required volume of the water swelling part. Frustrate In other words, its use reduces the usage of the water expanding portion.
- the exterior part may be made of a nonwoven fabric. This is because the nonwoven fabric can easily obtain the required properties (properties, flexibility, thickness, etc.) and can easily obtain a desired product.
- a pipe joint according to a fifth embodiment of the present invention is a pipe joint in which an end of a pipe is inserted and connected in a state where water is stopped.
- the pipe joint is characterized in that both ends of the water expansion portion are overlapped with each other in an overlap width formed to have a substantially uniform thickness in the circumferential direction.
- the above-mentioned water-swelling portion includes, for example, a water-swelling nonwoven fabric (a nonwoven fabric made of highly water-absorbing water-swelling fibers) disposed on the side facing the outer peripheral surface of the pipe, and an inner circumferential surface of the pipe joint. It can be constituted by a sheet laminated with a non-expandable non-woven fabric disposed on the opposite side, a sheet formed by laminating the water-expandable non-woven fabric and the non-expandable non-woven fabric in two or more layers, and the like.
- a water-swelling nonwoven fabric a nonwoven fabric made of highly water-absorbing water-swelling fibers
- a fixing method for fixing both ends of the water swelling portion in an overlapped state for example, a method of fixing with a needle punch, a method of bonding and fixing with an adhesive such as a rubber glue, a suture fixing with a sewing machine Or a fixing method such as fixing with a stapler. That is, as long as it is possible to protect the overlapping width in which the entire water-expanded portion is formed to have a substantially uniform thickness, it can be fixed using any one or a plurality of fixing methods.
- both ends of the water-swelling portion are overlapped with an overlap width formed to have a substantially uniform thickness in the circumferential direction, and the forming means ( For example, when integrally molded by a molding machine), the entire water-expanded portion and the overlapped portion are molded to a substantially uniform thickness by the pressure applied during the molding.
- the overlap width of the water expanding portion can be set to an overlap width substantially corresponding to the size of the tubular body.
- the overlap width A is set to about 80 mm or more, the thickness of the overlapped part must be evenly formed during molding. It is difficult to connect and disconnect pipes because the contact resistance applied to thick parts, which is difficult to handle, increases. become.
- the overlapping width A is set to approximately Omm or less, water running (leakage) will occur along the boundary line at both ends, and water cannot be stopped. Therefore, it is preferable to set the overlapping width of the water-expanded portion within a range of, for example, approximately 0 mm ⁇ Amm ⁇ approximately 80 mm.
- the both ends of the water expanding section can be integrally fixed by the fixing means while being overlapped.
- both ends of the water expansion portion wound in a substantially cylindrical shape are integrally fixed by the above-described fixing method, the size and shape integrally formed with the inner peripheral surface of the pipe joint can be maintained. it can.
- the overlapped portion of the water-expanded portion may be formed to have a substantially uniform thickness by a pressure applied when integrally formed with the inner peripheral surface of the pipe joint.
- the overlapped portion is further subjected to the pressure applied during the second molding. Since it is compressed and becomes thinner than in the first molding and impairs the water blocking property, when forming into a thickness suitable for stopping water, the overlapping portion of the water expansion part is attached to the inner peripheral surface of the pipe joint.
- the water-swelling fiber or the liquid water-absorbent resin hardly falls off from the base material of the non-woven fabric. There is an effect that can be done.
- the holding interposition portion is located on the inner layer side with respect to the water inflatable portion and prevents direct contact between the forming material and the water inflatable portion.
- Forming part Integrate with the connection while preventing it from being confined by the material and being affected by heat and pressure.
- the forming material and the water-swelling portion do not directly contact with each other, it is possible to prevent the formation of a nonuniform portion in the water-swelling portion due to the formation of the connection portion.
- the desired function of the water swelling portion is ensured, the swelling can be sufficiently performed, and high water stopping performance can be obtained.
- the holding interposition portion is located in the space on the inner layer side of the water expanding portion and occupies the space, the necessary amount of the water expanding portion can be reduced. For this reason, it is possible to reduce the amount of expensive water-swellable resin used and to manufacture the resin at low cost.
- the holding interposition portion is integrated with the water expansion portion in advance before forming the connection portion, the holding interposition portion can be handled as one member, so that the workability is good in manufacturing.
- the holding interposition portion is formed of a nonwoven fabric
- the molten resin enters between the nonwoven fabric fibers and is integrated, the bonding between the holding interposition portion and the molten resin can be performed firmly.
- water absorbency to the nonwoven fabric, water is positively supplied to the water swelling portion, so that the water swelling portion can be more efficiently expanded.
- the water swelling part is protected before connection and during connection work, and the water forming the water swelling part from the water swelling part. It is possible to prevent an important material such as an expandable resin from falling off. In addition, it is possible to prevent accidental swelling due to rainwater or the like before the connection work. After the connection, the exterior portion prevents the material such as the expanded water-swelling resin from dropping off, so that it is possible to use (connect) again after disconnecting once.
- the water swelling portion When the water swelling portion is partially disposed with respect to the connection portion, the water swelling portion can be manufactured at a lower cost in combination with the effect of providing a small amount of the water swelling portion by providing the holding interposition portion. Become.
- the water-swelling portion is covered with the exterior portion, even when the water-swelling portion is made of, for example, a water-swellable film, the water-swelling powder or granules may be used.
- the exterior portion covers the exterior side surface of the water swelling portion, and the water swelling portion itself and the water swelling which is a constituent material thereof. The material is protected so that it does not fall off, so even if it is used (connected) again, it can exert a sufficient water stopping function. That is, it can be used again. Further, since the usage of the water-swelling portion can be reduced due to the presence of the exterior portion, the usage of the expensive water-swellable resin (water-swelling material) can be suppressed, and the manufacturing can be performed at low cost.
- the overlapping width is formed such that both ends of the water expanding portion are formed to have a substantially uniform thickness, or the overlapping width is formed to have a substantially uniform thickness in the circumferential direction. And formed on the inner peripheral surface of the pipe joint, so that the entire water-expanded portion can be formed to have a substantially uniform thickness. It is possible to positively prevent intrusion and permeation of moisture, which does not cause a force that creates a gap in the overlapped portion and water running (water leakage). In addition, since the entire water expansion portion is formed to have a substantially uniform thickness, a large contact resistance that hinders the connection between the pipe body and the pipe joint is not partially provided, and the contact resistance applied to the mutually opposing portions is reduced. Since it is small, the work of inserting the end of the pipe into the pipe joint and the work of extracting the end of the pipe from the pipe joint can be performed easily and easily, and the workability is improved.
- the water-swelling fiber or the liquid water-absorbing resin hardly falls off from the nonwoven fabric base material.
- the purpose of this is to use a resin base fiber, a high-melting water-swellable resin material fiberized water-swellable fiber, and a non-woven cloth to form a nonwoven fabric. This was achieved by integrating the water-expanded part, in which the base fiber and the water-expanded fiber were bonded by a binder melted by heat, on the surface of the joint body facing the tube.
- the second embodiment of the present invention aims at improving the connection and operability of the joint body, improving the connection operability of the joint body, and obtaining a reliable water stopping effect with the joint body. This was achieved by forming a substantially uniform clearance between the outer peripheral surface of the pipe and the water expansion section when the pipe was connected.
- the third embodiment of the present invention aims at securing a water-stopping function, supplying a stable product, and manufacturing at a low cost. This has been achieved by providing a holding interposition part that is integrated with the connection part.
- the fourth embodiment of the present invention aims at providing a reliable water stopping function stably, reusable, and inexpensive to produce, on the outer layer side of the water expanding section. This was achieved by providing an exterior part that covers the water expansion part.
- the fifth embodiment of the present invention has the object of simplifying and easily connecting pipes and preventing the intrusion and permeation of water, by making the both ends of the water inflating section substantially uniform. This was achieved by superimposing them on the inner peripheral surface of the pipe joint in such a way as to be formed into a thicker shape.
- Example 1
- FIGS. 1 and 2 show a pipe joint 1 according to the first embodiment.
- This pipe joint 1 has an inner peripheral surface of a synthetic resin or synthetic rubber joint main body la having continuous spiral irregularities lb.
- a layered or sheet-shaped water swelling section 4 is integrated in the entire area, and one of the pipes 2 (so-called pipe) having a spiral uneven strip 2a and the other having a spiral uneven strip 2a. It connects the pipe 2 (so-called pipe).
- the pipe joint 1 is inserted into the pipe 2 until the other end 1A of the pipe joint 1 coincides with the end 2A of the negative pipe 2, and then connected to the end of the pipe 2. After matching or substantially matching 2A with the end 2A of the other pipe 2, screw the pipe fitting 1 once screwed back about half the screwed amount, and insert the other pipe fitting 1 into the pipe 2 and connect it. Then, as shown in FIG. 3, the two pipes 2 and 2 are connected by the pipe joint 1.
- the water expansion portion 4 As shown in FIG. 3, between the water expansion portion 4 integrated with the inner peripheral surface of the joint body la of the pipe joint 1 and the outer peripheral surfaces of the pipes 2 and 2, the water expansion portion 4 is provided. A clearance C (so-called water passage) for water distribution (for water intrusion) is formed before water is expanded by absorbing water and before drying (water release) after water expansion. [0084] These pipes 2 and 2 and the pipe joint 1 are buried in the ground with electric wires and cables inserted through the pipes 2 and 2, and the water inflation section 4 is When water is absorbed, as shown in FIG. 4 from the state shown in FIG. 3, the water expansion part 4, particularly the portions at both ends of the pipe joint 1, expands, and the water expansion part 4 causes the joint body la to expand due to the water expansion. By sealing the space between the tube and the outer peripheral surface of the tube 2 in a liquid-tight manner, a reliable water stopping effect is exhibited.
- FIG. 5 is an enlarged view showing the detailed structure of the water swelling section 4.
- a base fiber 9 made of resin such as PET which is a base material of a nonwoven fabric
- Water-expandable fiber 10 (expanded when absorbing water and releasing moisture when ambient humidity is low) with approximately 70-90 wt% of a binder made of low-melting PET, etc. Resin)
- about 2 to 15 wt% is used, and these are mixed almost evenly to form a nonwoven fabric (nonwoven fabric forming step).
- the above-mentioned water-swellable fiber 10 is a Bel Oasis (a product of Kanebo Synthetic Fibers Co., Ltd.) having a softening point of about 170 ° C, and is a polymer mainly composed of sodium polyacrylate. Is directly spun and made into a fiber shape to use highly water-absorbing and highly moisture-absorbing fibers). Also, a binder 11 having a low melting point of about 120 ° C. is used.
- the flat nonwoven fabric is formed into a cylindrical shape, and the cylindrical nonwoven fabric is adhered to an inner mold (more specifically, an inner mold having a plurality of divided structures and a shape surface that forms a spiral uneven strip).
- An outer mold having a half-structure (specifically, an outer mold having a shape surface that forms a spiral uneven strip) is placed on the outer peripheral side of the joint, and the joint body la is placed between the outer mold inner surface and the nonwoven fabric outer surface.
- the outer mold is closed and heated and pressurized at a molding temperature of about 150-180 ° C, the heat generated during this processing causes the binder 11 to melt. As shown in FIG.
- the base fiber 9 and the water-swelling fiber 10 are firmly bonded to each other by the melted binder 11 (the bonding step by the binder). 4 is integrated into the joint body la (integration process), so that after unmolding, it becomes the pipe joint 1 shown in FIG.
- the water-swelling fiber 10 in the above-mentioned water-swelling section 4 expands in the radial direction when absorbing water to be in the state of (port) in Fig. 5 and exhibits a water-stopping effect. Since the binder is firmly bonded to the base fiber 9 by the binder 11, the falling off of the water-swelling fiber 10 is extremely small.
- the pipe joint of the embodiment shown in FIGS. 1 and 5 is a pipe joint 1 having the joint body la connecting the ends of the pipes 2 and 2, and the resin as the base material.
- a base fiber 9 made of water Made of non-woven fabric using a base fiber 9 made of water, a water-swelling fiber 10 in which a high-melting-point water-swelling resin material is fiberized, and a binder 11, and the base fiber is melted by heat generated during the processing. 9 and a water-swelling fiber 10 are combined to form a water-swelling portion 4. It is integrated.
- the water-expandable portion 4 is formed by bonding base fiber 9 and water-expandable fiber 10 with binder 11 melted by heat during processing. Therefore, before the water absorption, the water-expandable fiber 10 hardly falls off from the nonwoven fabric base material, and even when the water-expandable fiber 10 expands by absorbing water, the water-expandable fiber 10 falls off very little. Become.
- a clearance C for water circulation is formed between the water-swelling portion 4 and the tubular body 2 before and after the water-swelling and during drying.
- the clearance C is formed between the water expanding portion 4 and the pipe 2 at both times before the water expansion and during the drying after the water expansion.
- the removal operation can be performed extremely smoothly and easily.
- the contact resistance between the water-expanded part 4 and the pipe body 2 is small both when the pipe joint 1 is attached and detached, so that the detachment of the water-expanded fiber 10 due to mechanical external force is further reduced.
- the reusability (repeated use performance) of the joint 1 is further improved.
- the water swelling section 4 can quickly expand and exhibit a good water stopping effect. It is needless to say that the pipe joint 1 can be removed against the fitting force of the water expanding portion 4 even during the water absorbing expansion.
- FIG. 6 is an enlarged view showing another embodiment of the water swelling section 4.
- a resin base fiber 9 such as PET which is a base material of a nonwoven fabric and a low melting point water swelling resin material are used.
- Fiberized water-expandable fiber 12 fiber that expands when absorbing water and releases moisture when ambient humidity is low
- a non-woven fabric is formed by mixing these almost uniformly (non-woven fabric forming step).
- a Lanseal registered trademark, product of Toyobo Co., Ltd.
- softening point is about 120 ° C.
- the flat nonwoven fabric is formed into a cylindrical shape, and is adhered to an inner mold (more specifically, an inner mold having a plurality of divided structures and having a shape surface forming a spiral uneven strip).
- An outer mold having a half-structure (specifically, an outer mold having a shape surface that forms a spiral uneven strip) is placed on the outer peripheral side of the joint, and the joint body la is placed between the outer mold inner surface and the nonwoven fabric outer surface.
- the outer mold is clamped, and heated and pressed at a molding temperature of about 150 to 180 ° C. As shown in FIG.
- the softened water-expandable fiber 12 is firmly bonded to the base fiber 9 over a wide area (bonding step) since the softened state is obtained as shown in FIG.
- the water expansion portion 4 is formed, and the water expansion portion 4 is integrated with the joint main body la (integrating step), so that the pipe joint 1 shown in FIG.
- the water-swelling fibers 12 in the water-swelling section 4 expand radially during water supply and become the state shown in (c) of Fig. 6 and exhibit a water-stopping effect. In other words, the swollen fibers 12 follow the surface to be stopped and stop water. At this time, since the water-swelling fibers 12 are softened by the heat at the time of the above-mentioned processing and are firmly bonded to the base fiber 9 over a wide area, the falling-off of the water-swelling fibers 12 is extremely small. Become.
- the pipe joint of the embodiment shown in Fig. 6 is a pipe joint 1 including the joint body 1a that connects the ends of the pipe bodies 2 and 2, and is made of a resin-made base material.
- the non-woven fabric is processed into a nonwoven fabric by using the base fiber 9 and the water-swelling fiber 12 in which the low-melting water-swelling resin material is fibrillated (see (a) in FIG. 6), and the water-swelling fiber 12 softened by heat during the processing.
- Form a water swelling portion 4 bonded to the base fiber 9 see (port) in FIG. 6
- the water swelling portion 4 is integrated with the surface of the joint body la facing the pipes 2 and 2. It is a thing.
- the water-expandable portion 4 includes the water-expandable fiber 12 softened by heat during processing, as shown in FIG. Since the fibers are bonded to the fibers 9, the water-swelling fibers 12 hardly fall off from the nonwoven base material before water absorption, and the water-swelling fibers 12 expand by absorbing water as shown in FIG. In this case, the falling off of the water-expandable fiber 12 is extremely small. [0099] Further, since the above-mentioned water-expandable fiber 12 shrinks to its original volume during drying, it can be reused even after the pipe joint 1 has been used once. In addition, since the water-swelling fibers 12 are almost uniformly present in the water-swelling section 4, an appropriate water-stopping effect can be secured.
- a clearance C for water circulation is formed between the water-swelling portion 4 and the pipes 2, 2 before and after the water-swelling and during drying.
- the clearance C is formed between the water expanding portion 4 and the pipes 2 at both the time before the water expansion and the time of the drying after the water expansion.
- the water swelling portion 4 can quickly expand and exhibit a good water stopping effect.
- FIG. 7 is an enlarged view showing another embodiment of the water swelling section 4.
- a non-woven fabric is formed by using a resin base fiber 9 such as PET as a non-woven fabric base (non-woven fabric). Forming step).
- the nonwoven fabric is impregnated with the liquid water-absorbent resin 13 (impregnation step).
- the liquid water-absorbent resin 13 EKOS® (manufactured by Sun Aid Co., Ltd.) is used.
- the flat nonwoven fabric is formed into a cylindrical shape, and is adhered to an inner mold (more specifically, an inner mold having a multiple-partitioned structure and a shape surface that forms a spiral uneven strip).
- An outer mold with a half-split structure (specifically, an outer mold with a shape surface that forms spiral unevenness) is placed on the outer peripheral side, and a joint body la is formed between the inner surface of the outer mold and the outer peripheral surface of the nonwoven fabric.
- the synthetic resin or synthetic rubber in the molten state is filled, the outer mold is closed, and heated and pressed at a molding temperature of about 150 to 180 ° C. to form the water-expanded portion 4. Since the water expansion section 4 is integrated with the joint body la (integration step), the pipe joint 1 shown in FIG. 1 is obtained after the mold is separated.
- the liquid water-absorbent resin 13 in the above-mentioned water swelling section 4 expands when absorbing water and changes from the state of (a) in FIG. 7 to the state of (mouth) in FIG. At this time, since the liquid water-absorbent resin 13 has a large area and is firmly bonded to the base fibers 9 by impregnation, the liquid water-absorbent resin 13 falls off very little.
- the pipe joint of the embodiment shown in FIG. 7 has a joint body 1 connecting the ends of the pipes 2 and 2.
- a pipe joint 1 provided with a, which is processed into a non-woven fabric using a resin base fiber 9 serving as a base material, and forms a water-swelling portion 4 in which the non-woven fabric is impregnated with a liquid water-absorbent resin 13.
- the water expansion section 4 is integrated with a surface of the joint body la facing the pipe 2.
- the water-swelling portion 4 is formed by impregnating the nonwoven fabric made of the base fiber 9 with the liquid water-absorbing resin 13, and the two are strongly bonded to each other.
- the expanded fibers 10 hardly fall off the nonwoven fabric base material, and when the liquid water-absorbent resin 13 expands by absorbing water, the liquid water-absorbent resin 13 falls off very little. Further, since the above-mentioned liquid water-absorbent resin 13 shrinks to its original volume when dried, it can be reused even after the pipe joint 1 has been used once.
- a clearance C for water circulation is formed between the water-swelling portion 4 and the tube 2 before and after the water-swelling and at the time of drying after the water-swelling.
- the clearance C is formed between the water expanding portion 4 and the pipe 2 at both times before the water expansion and during the drying after the water expansion.
- the removal operation can be performed extremely smoothly and easily.
- the contact resistance between the water-expanded part 4 and the pipe body 2 is small both when attaching and detaching the pipe joint 1, so that the drop of the liquid water absorbent resin 13 due to mechanical external force is further reduced.
- the reusability of the pipe joint 1 is further improved.
- the water swelling portion 4 can quickly expand and exhibit a good water stopping effect.
- the liquid water-absorbent resin 13 was impregnated before the formation of the water-swelled portion 4.
- the liquid water-absorbent resin 13 may be applied before the formation of the water-swelled portion 4.
- the liquid water-absorbent resin 13 may be applied after the formation of the water swelling portion 4. In any case, it is desirable that the liquid water-absorbent resin 13 be impregnated or applied to the entire water-swelling portion 4 almost uniformly.
- the above-described water-expandable fibers 10 and 12 processed into urethane foam may be integrally formed into the joint body la of the pipe joint 1 to be integrated.
- FIG. 8 shows a pipe joint 1 according to a second embodiment.
- This pipe joint 1 has a continuous spiral concave and convex strip formed of a convex portion IbA protruding radially inward and a concave portion lbB forming an outer peripheral portion. Water expansion of almost uniform thickness over the entire inner peripheral surface of the synthetic resin or synthetic rubber joint body la having lb
- One of the pipes 2 having a helical concave and convex ridge 2a composed of a peak 2aA and a valley 2aB shown in FIG. 8 and a peak 2aA
- the other tubular body 2 (so-called pipe) having the spiral ridges 2a composed of the valleys 2aB is connected in the same manner as in the first embodiment.
- FIGs. 9 and 10 illustrate the case where the number of spiral ridges or protrusions IbA in the axial direction of the joint body la is "5" as an example of "4-6". If the number of parts IbA is set to ⁇ 4-6 '', even if the position of the ends 2A, 2A is biased to either one as shown in Figs. Strength and tensile strength at the same time.
- FIG. 11 shows a state before the water expansion section 4 absorbs the water and before drying
- FIG. 12 shows a state when the water expansion section 4 has expanded by absorbing water.
- FIGS. 13 and 14 show the case where the number of spiral ridges or protrusions IbA in the axial direction of the joint body la is set to “2.5” as an example of “2 or more”.
- the end 2A, 2A is located at or near the center of the joint body la in the axial direction when the fitting 1 is installed, it is possible to ensure both appropriate liquid tightness and secure tensile strength. In addition, the amount of screwing and unscrewing is minimized, and connection operability is improved.
- FIG. 13 shows a state before water absorption of the water swelling section 4 and a state at the time of drying
- FIG. 14 shows a state when the water swelling section 4 has expanded by absorbing water.
- FIGS. 15 and 16 show the case where the number of spiral ridges or protrusions IbA in the axial direction of the joint body la is set to “8” as an example of “7 ⁇ 8”.
- the tensile strength can be further improved as compared with the embodiment shown in FIGS. Note that FIG. 15 shows a state before the water expansion section 4 absorbs water and at the time of drying, and FIG. 16 shows a state when the water expansion section 4 has expanded by absorbing water.
- FIG. 17 is a partially enlarged cross-sectional view of the water expanding portion 4 before water absorption and during drying (at the time of releasing water), and shows the inner diameter of the joint body la including the water expanding portion 4, that is, a protrusion protruding inward in the radial direction.
- the inner diameter of the portion IbA is Dl
- the outer diameter of the peak 2aA of the spiral uneven strip 2a of the tube 2 is shown in FIG. 17 for convenience of illustration, but the same is true for the other tube 2).
- this value is less than 1.0, preferably 0.75, then 1; more preferably, 0.80 ⁇ 0 ⁇ 0.90; and more preferably It is set to 0.82 ⁇ ⁇ 0.88, and is displayed.
- a spiral uneven strip lb screwed to the spiral uneven strip 2a of the tube 2 is formed in the joint main body la, and as shown in the figure, the joint main body la has When the pipes 2 and 2 are connected, the inner end of the convex portion IbA of the spiral ridge inward in the radial direction of the joint body la (however, in this case, the convex portion IbA without the water expansion portion 4) The inner end) and the outer end of the adjacent ridge 2aA of the spiral ridge 2a of the tube 2 overlap in the radial direction by a predetermined amount W.
- the amount of overlap W can be set to an arbitrary value corresponding to the outer diameter D2 of the tube 2, and this overlap structure ensures a sufficient tensile strength (pull-out strength) of the pipe joint 1. S can do it.
- Fig. 18 is a cross-sectional view taken along the line X-X in Fig. 9. At least one projection Id for connection operation (having an opening angle of 180 degrees in the drawing, A total of two ridges integrally formed over the entire axial length of the joint body la).
- Figs. 19 and 20 are enlarged views showing the detailed structure of the water swelling section 4.
- a resin base material fiber such as PET, which is a base material of the nonwoven fabric, has a high melting point of about 10 25%.
- Water-swelling fiber 10 made from fiberized water-swelling resin material is about 70 to 90 wt%, and a binder 11 such as low melting point PET (see About 2 to 15 wt% of binder resin is used, and these are mixed almost evenly to form a nonwoven fabric (nonwoven fabric forming step).
- the above-mentioned water-swelling fiber 10 is a Bel-Oasis (a product of Kanebo Synthetic Fibers Co., Ltd.) having a softening point of about 170 ° C, and is a polymer mainly composed of sodium polyacrylate. Is directly spun and made into a fiber shape to use highly water-absorbing and highly moisture-absorbing fibers). Also, a binder 11 having a low melting point of about 120 ° C. is used.
- the flat non-woven fabric is formed into a cylindrical shape, and the cylindrical non-woven fabric is adhered to an inner mold (more specifically, an inner mold having a plurality of divided structures and a shape surface forming a spiral uneven strip).
- An outer mold having a half-structure (specifically, an outer mold having a shape surface that forms a spiral uneven strip) is placed on the outer peripheral side of the joint, and the joint body la is placed between the outer mold inner surface and the nonwoven fabric outer surface.
- the outer mold is closed and heated and pressurized at a molding temperature of about 150-180 ° C, the heat generated during this processing causes the binder 11 to melt. As shown in FIG.
- the base fiber 9 and the water-swelling fiber 10 are firmly bonded by the molten binder 11 (the bonding step by the binder), and the water-swelling part 4 becomes the joint body la. Since the mold is unified (integration process), the pipe joint 1 shown in FIG.
- the water-swelling fibers 10 in the above-mentioned water-swelling section 4 expand radially when water is absorbed, and assume the state shown in FIG. 20 to exhibit a water-stopping effect. At this time, the water-swelling fibers 10 are bound by the binder 11 Since it is firmly bonded to the base fiber 9, it is possible to prevent the non-woven fabric of the water-swelling fiber 10 from falling off the base material before and after water absorption.
- water-swellable fiber 10 instead of the above-described water-swellable fiber 10 in which the high-melting-point water-swellable resin material is fiberized, a low-melting
- the use of water-swelling fibers in which the point water-swelling resin material is fiberized eliminates the need for a binder and eliminates the need for this water.
- the expanded fiber itself functions as an S binder. That is, the water-expandable fibers are melted by the heat during processing and are firmly bonded to the base fibers 9.
- the water-swelling portion 4 may be formed by using a non-woven fabric impregnated with a liquid water-absorbing resin (for example, ETAOS (trademark), a product of Sun Attached Co., Ltd.).
- ETAOS trademark
- ETAOS trademark
- the joint body la is formed of synthetic resin.
- the joint body la may be formed of synthetic rubber as shown in FIG. 21 or as shown in FIG.
- the joint body la may be configured to have a flat outer periphery without a groove in the outer periphery.
- the pipe joint 1 of the above embodiment is a pipe joint 1 including the joint body la that connects the ends of the tubular bodies 2 and 2 having the spiral uneven strips 2a and 2a.
- a water expansion section 4 is provided on the inner peripheral surface of la, and when pipes 2 and 2 are connected by the above-mentioned joint body la, a substantially uniform clearance is formed between the outer surfaces of the pipes 2 and 2 and the water expansion section 4. C is formed.
- the water expansion portion 4 absorbs water and expands to stop water between the pipes 2, 2 and the joint body la.
- the clearance C can be set to an arbitrary value of 0.2 mm to 5. Omm corresponding to the outer diameter of the tubes 2 and 2. According to this configuration, since a substantially uniform clearance C is formed, attachment and detachment of the joint body la becomes easy, connection operability of the joint body la is improved, and when the pipe 2 has a bend, In addition, the connection between the pipe body 2 and the pipe joint 1 is facilitated by the talliance C, and the clearance C secures a water passage through which water and water are allowed to enter. Rapid water absorption expansion can provide a reliable water stopping effect. Furthermore, the formation of the clearance C can prevent the water-swelling fibers and the water-absorbent resin used in the water-swelling portion 4 from falling off due to mechanical external force, so that the durability of the pipe joint 1 can be improved.
- the inner diameter D1 of the joint body la including the water expansion section 4 is set to the spiral unevenness of the pipes 2 and 2.
- the value ⁇ divided by the outer diameter D2 of the peak is set to less than 1.0. According to this configuration, since the above-mentioned value ⁇ is set to less than 1.0, the force S for reliably connecting the pipes 2 and 2 with the joint body la can be obtained.
- a spiral ridge (see spiral ridge lb) screwed to the spiral ridge 2a of the tube 2 is formed on the joint body la.
- the protrusion IbA end of the spiral ridge inward in the radial direction of the joint body la and the adjacent peak 2aA, 2aA end of the spiral ridge 2a, 2a of the pipe 2, 2 It overlaps in the radial direction (see overlap amount W).
- the convex portion 1 bA end of the spiral ridge inwardly in the radial direction of the joint body la (however, the convex portion IbA end not including the water expanding portion 4) and the tubular body 2, 2 Since the ends of the ridges 2aA, 2aA adjacent to the spiral ridges 2a, 2a overlap in the radial direction, sufficient tensile strength (pull-out strength) can be secured.
- a projection Id for connection operation is provided on the outer peripheral side of the joint main body la. According to this configuration, the protrusion Id can prevent the operator's hand from slipping during the connection operation, and as a result, the attachment and detachment operation of the pipe joint 1 can be facilitated.
- the number of spiral ridges in the axial direction of the joint main body la was set to 2-8. According to this configuration, it is possible to ensure both tensile strength and improved workability at the time of connection between the pipes 2 and 2 and the joint body la. In other words, when the number of the convex portions IbA is less than 2, no tensile strength can be obtained. Conversely, when the number of the convex portions IbA exceeds 8, the workability at the time of connection deteriorates. If it is difficult to make a connection due to the bending force S, it is necessary to set the number of protrusions IbA to 2-8, and preferably 2.5-7.5, to increase the tensile strength. Can be achieved while improving workability.
- the number of spiral ridges corresponds to the number of protrusions IbA.
- FIG. 23 shows a pipe joint 1 according to a third embodiment.
- This pipe joint 1 connects synthetic resin pipes 2 and 2 in the same manner as in the first and second embodiments. Screw the two ends of the tube.
- the joint body la having a cylindrical connecting part lc on both sides and a spiral concave and convex strip lb absorbs moisture and expands to prevent water from being connected to the connected pipe 2.
- the water stop function layer 3 is formed.
- the whole in the length direction has the same shape as the connection part lc.
- the water-stopping function layer 3 is formed using a water-swelling portion 4 made of a water-swellable nonwoven fabric.
- FIG. 24 is an explanatory view showing the structure of the water-stopping function layer 3.
- the water-stopping function layer 3 has a holding interposition part 5 made of a nonwoven fabric on the inner layer side, that is, the connection part lc side of the water expansion part 4. It is provided and formed.
- the holding interposition portion 5 is mainly for protecting the water swelling portion 4 and strengthening the connection with the connection portion lc, and is formed of a non-woven fabric having no water swelling property.
- the material of the nonwoven fabric may be a general synthetic fiber such as polyethylene terephthalate, polyethylene, polypropylene, EVA or the like, but is preferably a material having heat resistance.
- the water swelling section 4 is preferably formed by mixing a water swelling material 6 such as a powdery or granular superabsorbent resin into a nonwoven fabric. Incorporation is performed by using an adhesive (binder) to adhere to the fibers constituting the nonwoven fabric or to hold the fibers between the fibers.
- a low-melting-point thermoplastic synthetic resin that can be melted by heat during molding, preferably a fibrous thermoplastic resin, may be mixed.
- the contamination is very small and may be, for example, about 2-15%. More preferably, the content is 2 to 8% so as not to hinder the expansion of the water expandable body.
- the interposed nonwoven fabric 5a and the water-swelled nonwoven fabric 4a for forming the holding intervening portion 5 and the water-swelled portion 4 are superimposed on each other to form an integral body.
- the above-mentioned integration is preferably performed by, for example, a needle punch because the non-woven fabrics are combined, but may be performed by another method using an adhesive or the like.
- the thicknesses of the intervening nonwoven fabric 5a (intervening interposition portion 5 for holding) and the water-swelling nonwoven fabric 4a (water-swelling portion 4) are set so that sufficient water-stopping performance can be obtained when the water-swelling portion 4 expands with water. It should be set appropriately. In consideration of the water swelling performance of the water swelling nonwoven fabric 4a, it can be set to, for example, 1: 1, 2: 1, 1: 2-1: 5. It will be different.
- the integrated sheet material is formed into a cylindrical shape so that the water-swellable nonwoven fabric 4a is on the inside. Used as the cylindrical member 7. That is, after fitting the tubular member 7 in a state of being wound around a pipe joint forming die (not shown), the synthetic resin as a forming material is injected to form the pipe joint 1. The ends of the cylindrical member 7 are appropriately overlapped with each other in width, and the overlapped portion is fixed by an appropriate method using a needle punch or stitching, and furthermore, an adhesive, a stapler or the like. Fixing may be about temporary fixing.
- the cylindrical member 7 When the molding is performed, the cylindrical member 7 is pushed by the molten resin and is deformed along the spiral unevenness of the mold.
- the holding interposition part 5 prevents the forming material forming the pipe joint 1 from being in contact with the water expansion part 4 inside the water expansion part 4 as shown in FIG. Be one. Since the contact with the high-temperature molten resin is cut off, the water expanding section 4 is not affected by heat or pressure.
- the pipes 2 are connected to each other by screwing the ends of the pipes 2 to the connection portions lc. 3 contains water in the ground, and as a result, the water expansion portion 4 of the water-stopping function layer 3 expands, and water-stopping is obtained at the joint with the pipe 2 (see FIGS. 26 and 27).
- connection is performed as shown in FIG. That is, the pipe joint 1 is screwed into one of the pipes 2 to be connected [FIG. 28 (a)], and the end face of the pipe joint 1 matches the end face of the pipe 2 [FIG. 28 (b)]. The end face of another pipe 2 to be connected is abutted against the end face of the previous pipe, and finally the screwed-in fitting 1 is returned [Fig. 28 (c)]. Align the joints between the bodies (see Figure 26). Thus, the connection operation can be performed simply and quickly.
- a substantially uniform clearance C is required at the time of connection.
- the presence of such a clearance C facilitates the capillary phenomenon and facilitates the entry of water for expanding the water expanding section 4, so that the water expanding section 4 can be efficiently expanded over the whole.
- the water expanding portion 4 is prevented from being in direct contact with the forming material by the holding intervening portion 5, the water expanding portion 4 is sealed by the forming material forming the connection portion lc, or heat or heat is generated. It is possible to demonstrate reliable water stopping performance without being affected by pressure.
- connection portion lc and the water expansion portion 4 do not directly contact with each other, it is possible to eliminate the generation of an inhomogeneous portion in the water expansion portion 4 due to the formation of the connection portion lc. It is possible to obtain products of stable quality.
- the intervening portion 5 for retaining is provided in the water-stopping function layer 3, the ratio of the water-swelling portion 4 in the water-stopping function layer 3 has been increased up to now (the entire water-stopping function layer 3 is inflated with water. (When configured with part 4). For this reason, it is possible to reduce the amount of the expensive water-swelling material 6 to be used and to realize inexpensive production.
- both the water swelling portion 4 and the holding interposition portion 5 are made of a nonwoven fabric, desired properties can be freely obtained. That is, there is a high degree of freedom in setting properties such as heat melting property, shape retention, air permeability, density, and water absorption, and functions such as flexibility and thickness. Therefore, it is easy to obtain a desired product. In addition, strong integration can be easily performed by the needle punch.
- the holding interposition portion 5 is formed of a nonwoven fabric, the coupling force with the material for forming the pipe joint 1 is highly integrated.
- the water expanding portion 4 and the holding interposition portion 5 are firmly integrated with each other by the needle punch, the integrality between the water expanding portion 4 and the pipe joint 1 can be increased.
- the water expanding portion 4 and the holding interposition portion 5 are integrated before forming the pipe joint 1, they can be handled as one member, and workability is good in manufacturing.
- FIG. 29 shows another example of the configuration of the water expanding section 4, in which a fibrous water expanding material (hereinafter referred to as a water expanding fiber 14) is used instead of the powdery water expanding material 6 as described above.
- a fibrous water expanding material hereinafter referred to as a water expanding fiber 14
- the non-woven fabric constituting the water-swelling portion 4 is composed of a water-swelling fiber 14 (shown solid in the figure), a general non-woven fabric material fiber 15 for shaping the shape (shown in white in the figure), and a tube. It is formed by mixing with binder fiber 16 (shown by a curve in the figure) as a binder that is melted by heat at the time of forming the joint. If the water-expandable fiber 14 is a raw material that is melted by heat generated when the pipe joint 1 is formed, the binder fiber 16 can be omitted.
- FIG. 30 shows an example in which the holding interposition portion 5 is formed of a synthetic resin sheet or a foamed resin sheet instead of a nonwoven fabric.
- the holding interposition portion 5 can be formed of a material other than the nonwoven fabric.
- the bonding and integration with the water expanding section 4 may be appropriately performed by using an adhesive such as heat welding or rubber glue.
- the water swelling portion 4 may be either a powdery or granular material (water swelling material 6) or a fibrous (water swelling fiber 14).
- Fig. 31 shows an example of the pipe joint 1 in which the water expansion section 4 is not provided on the entire connection section lc, but is provided partially.
- the connection portion lc is partially formed along the length direction, and the water expansion portion 4 is formed at the outer end of the connection portion lc.
- a holding interposition part 5 is provided on the whole water-stopping function layer 3, and a water swelling part 4 is provided only on a necessary part.
- a water-swelling non-woven fabric 4a of a required size smaller than that into a part of the non-woven fabric 5a Since the required amount of the water expanding portion 4 can be reduced in the thickness direction as described above and also in the surface direction, the cost can be further reduced.
- FIG. 33 shows another example in which the water expanding portion 4 is partially provided.
- the water expanding portion 4 is partially formed along a spiral circumferential direction.
- FIG. 34 shows still another example, in which an exterior part 8 that covers the water expansion part 4 is provided on the outer layer side of the water expansion part 4, that is, on the side in contact with the pipe 2 to be connected.
- the exterior part 8 is made of a nonwoven fabric as shown in Fig. 34 (a), or a synthetic resin sheet, a foamed resin sheet or a woven fabric as shown in Fig. 34 (b). It is joined to the expanding section 4 by an appropriate method such as needle punching or bonding.
- synthetic resin sheet for example, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. can be adopted.
- foamed resin sheet urethane foam, PE foam, PP foam, etc. A body or the like can be adopted. It does not matter whether it is simple foaming or continuous foaming. Cotton cloth or the like can be adopted as the woven fabric.
- the exterior part 8 protects the water-swelling part 4 before and during connection work, and the water-swelling part 4 This prevents the water-swelling material 6 and the water-swelling fiber 14 constituting the water-swelling portion from falling off. In addition, it is possible to prevent the rain that has fallen on the site before the connection work, or the accidental wetting by the accumulated rainwater or groundwater, and the expansion of the water expansion unit 4.
- FIG. 35 shows a pipe joint 1 according to a fourth embodiment, in which the structure of the water-stopping function layer 3 formed on the inner surface of the joint body la is connected to the outer layer side of the water expansion section 4, that is, the connecting pipe. On the second side, a nonwoven fabric outer part 8 is provided and formed.
- the exterior portion 8 is mainly for protecting the water swelling portion 4, and is formed of a nonwoven fabric having no water swelling property.
- the material of the nonwoven fabric is the same as that of the third embodiment.
- the interposed nonwoven fabric 8a and the water-swelled nonwoven fabric 4a for forming the exterior part 8 and the water-swelled portion 4 are polymerized and integrated with each other as shown in Fig. 25.
- the thickness of the interposed nonwoven fabric 8a (exterior portion 8) and the water-swelled nonwoven fabric 4a (water-swelled portion 4) is the same as in the third embodiment described above. It should be set appropriately so that sufficient water stopping performance can be obtained when
- the integrated sheet material is formed into a tubular member 7 which is rolled into a tubular shape so that the water-swellable nonwoven fabric 4a is on the outside.
- the cylindrical member 7 When the molding is performed, the cylindrical member 7 is pushed by the molten resin and is deformed along the spiral irregularities of the mold. Then, by melting the thermoplastic resin mixed in the water expanding section 4, even if the mold has a spiral unevenness, the mold is stabilized in a shape along the shape, and the water expanding material 6 is formed. Hold. Further, as shown in FIG. 35, the exterior part 8 is integrated with the pipe joint 1 in a state where the water expansion part 4 is covered outside the water expansion part 4.
- connection portion lc the end of the pipe 2 is screwed into the connection portion lc to form the pipe joint. If the two are connected and laid underground, the water-stopping function layer 3 will contain moisture in the ground, and this will cause the water-expanding part 4 of the water-stopping function layer 3 to expand, and the third embodiment will be described. Water-stopping almost equivalent to the form is obtained (see Fig. 36).
- the connection method is the same as that of FIG. 28, and a detailed description thereof will be omitted.
- the exterior portion 8 protects the water swelling portion 4 before and during the connection work of the pipe 2, and the water swelling portion 4 is protected. This prevents the water expanding material 6 constituting the water expanding portion from falling off. In addition, it is possible to prevent the water swelling part 4 from expanding due to rain falling on the site before the connection work, unexpected rain due to accumulated rainwater or groundwater, or the like.
- the exterior part 8 prevents the expanded water expanding material 6 from falling off even after the connection. Therefore, even after disconnecting once, it can be used (connected) again.
- the ratio of the water-swelling portion 4 in the water-stopping function layer 3 can be determined by the following (the entire water-stopping function layer 3 is constituted by the water-swelling portion 4) ). For this reason, it is possible to reduce the amount of the expensive water-swelling material 6 to be used and to realize inexpensive manufacturing.
- both the water swelling portion 4 and the exterior portion 8 are made of a nonwoven fabric, desired properties can be freely obtained. That is, there is a high degree of freedom in setting properties such as properties such as heat fusibility, shape retention, air permeability, density, and water absorption, and flexibility and thickness. Therefore, it is easy to obtain a desired product. As for the force, strong integration can be easily performed by the needle punch. Furthermore, since the water swelling part 4 and the exterior part 8 are integrated prior to the formation of the pipe joint 1, they can be handled as one member, and workability is good in manufacturing.
- FIG. 37 shows another example of the configuration of the water swelling section 4.
- An exterior section 8 made of a nonwoven fabric is provided on the outer layer side of the water swelling section 4, that is, on the side of the pipe 2 to be connected.
- a fibrous water-swelling material hereinafter referred to as a water-swelling fiber 14
- a water-swelling fiber 14 is used instead of the granular water-swelling material 6.
- Figs. 38 (a) and 38 (b) show an example in which the exterior part 8 is made of a synthetic resin sheet, a foamed resin sheet, or a woven fabric instead of a nonwoven fabric.
- the exterior part 8 can be made of a material other than the nonwoven fabric.
- the synthetic resin sheet for example, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. can be adopted.
- PET polyethylene terephthalate
- the foamed resin sheet urethane foam, PE foam, PP foam, etc. Can be adopted. It does not matter whether it is simple foaming or continuous foaming. Cotton cloth or the like can be used as the woven fabric. Bonding and integration with the water expanding section 4 may be appropriately performed by using an adhesive such as rubber glue.
- the water swelling portion 4 may be either a powdery or granular material (water swelling material 6) or a fiber (water swelling fiber 14).
- Fig. 39 shows an example of the pipe joint 1 in which the water inflation portion 4 is not provided on the entire connection portion lc, but is provided partially, and the operation and effect substantially the same as the configuration in Fig. 31 are obtained. can get.
- the exterior part 8 is provided on the whole water-stopping function layer 3 and the water swelling part 4 is provided only on the necessary part.
- the water-swelling nonwoven cloth 4a is integrated (see Fig. 32).
- FIG. 40 shows another example in which the water expansion portion 4 is partially provided.
- the water expansion portion 4 is partially formed along the spiral circumferential direction.
- FIGS. 41 (a) and 41 (b) show still another example, in which the holding intervening portion 5 is provided on the inner layer side of the water expanding portion 4, ie, on the connecting portion lc side.
- the holding interposition portion 5 is mainly for protecting the water swelling portion 4 and strengthening the connection with the connection portion lc, and is formed of a nonwoven fabric having no water swelling property.
- the material of the nonwoven fabric may be a general synthetic fiber such as polyethylene terephthalate, polyethylene, polypropylene, EVA or the like, but is preferably a material having heat resistance.
- the water swelling portion 4 and the exterior portion 8 are integrated by an appropriate method such as needle punching and bonding as described above.
- the water expanding portion 4 is prevented from being in direct contact with the forming material by the holding interposition portion 5, the water expanding portion 4 is sealed with the forming material forming the connecting portion lc, or heat or heat is generated. It is possible to prevent the influence of pressure or the like, and it is possible to exhibit reliable water stopping performance. [0182] Further, since the material for forming the connection portion lc and the water expansion portion 4 do not directly contact each other, it is possible to prevent the formation of the connection portion lc from causing an uneven portion to be generated in the water expansion portion 4. It is possible to obtain products of stable quality.
- the holding interposition portion 5 is formed of a non-woven fabric, the integration with the forming material of the pipe joint 1 is high. In addition, since the water swelling part 4 and the holding interposition part 5 are firmly integrated by the needle punch, the integrality between the water swelling part 4 and the pipe joint 1 can be increased. Note that the holding interposition portion 5 may be made of a synthetic resin sheet, a foamed resin sheet, or the like.
- the pipe joint 1 of the third and fourth embodiments may be, for example, a dissimilar pipe joint or the like in addition to the straight joint as in the above-described example.
- the material is not only synthetic resin but also synthetic rubber.
- the formation of the water-stopping function layer 3 (molding of the pipe joint 1) is not limited to injection molding, and other molding methods (for example, blow molding) can be adopted according to the shape of the pipe joint 1 and the like.
- a water stop function layer 3 can also be configured.
- a liquid non-water-swellable nonwoven fabric may be coated or impregnated with a liquid water-swelling material to impart high water absorbency to only one side of the nonwoven fabric or only a part of one side of the nonwoven fabric.
- the holding interposition portion 5 is made of a nonwoven fabric, and the holding interposition portion 5 If there is a possibility of absorbing the pressing force due to the expansion of the expansion material 6 and the water expansion fiber 14, an appropriate sheet material such as a synthetic resin sheet is provided between the water expansion portion 4 and the holding interposition portion 5. It is preferable that the expanded water expansion material 6 and the expanded water fiber 14 are not carried on the holding interposition portion 5 by interposing.
- FIGS. 42 and 43 show a pipe joint 1 according to a fifth embodiment.
- pipes 2 and 2 made of synthetic resin are formed in the same manner as in the first and second embodiments.
- the water-inflatable portion 4 in the form of a layer or a sheet, which expands by receiving and expanding, is overlapped, for example, so that both end portions 23a, 23a of the nonwoven sheet 23 are formed into a substantially uniform thickness, and the entire inner peripheral surface of the joint body la is It is molded integrally with the body (or part of the inner peripheral surface).
- the water swelling portion 4 described above has a water swelling nonwoven fabric 21 disposed on the side facing the outer peripheral surface of the tubular body 2, and the water swelling nonwoven fabric 21 on the side facing the inner peripheral surface of the joint body la.
- the nonwoven sheet 23 formed by integrally laminating the non-expandable nonwoven cloth 22 to be arranged is processed and wound into a substantially cylindrical shape, and the winding-side both ends 23a, 23a of the nonwoven sheet 23 are After setting the overlap width A so that the thickness is substantially uniform in the circumferential direction and the length direction, and overlapping vertically (in the radial direction), the overlapping portions of both ends 23a, 23a 23b is integrally fixed while being overlapped with the needle punch 25 in the length direction (and also in the axial direction) along the overlap portion 23b.
- the non-woven sheet is formed when the water expansion section 4 is integrally formed with the inner peripheral surface of the pipe joint 1.
- the width of the overlapping portion 23b of 23 is Amm
- the overlap width A is set within a range of about 5 mm to about 25 mm, and when using for a joint size of about 200 mm, the overlap width A is Approximately 30mm—Set within the range of approximately 60mm. When used for a joint size of approximately 40 mm to approximately 150 mm, it is better to overlap the overlap width A as set for each joint size.
- the lower limit of the overlap width A is set to approximately 5 mm ⁇ Amm, it is also possible to change the lower limit of the overlap width A to approximately 5 mm or less and the upper limit to approximately 80 mm or more.
- the overlap width A is set to approximately 80 mm or more, in the integral molding described later, the overlap portion 23b is provided to a thick portion where it is difficult to form the thickness evenly. Since the contact resistance increases, connection and disconnection of the tube 2 become difficult.
- the overlapping width A is set to approximately 0 mm or less, the both ends 23a, 23a of the nonwoven sheet 23 cannot be processed and fixed into a substantially cylindrical shape in which the both ends 23a, 23a are integrally laminated. Water running (water leakage) occurs along the border line of a, so water cannot be stopped.
- the overlapping width A is set as described above. It is preferable to set within the range of approximately 0 mm ⁇ Amm ⁇ approximately 80 mm.
- the overlap width A is set to, for example, a width substantially corresponding to the area of the water-expanded portion 4 developed in a plane, or set to an overlap ratio substantially corresponding to the joint size (including the pipe diameter). It is possible.
- the overlapping width A of the nonwoven sheet 23 is, for example, approximately 10 with respect to the outer diameter of the tubular body 2.
- / o Allows setting the overlap width A to fall within the range of about 25%. If the overlap width A is set to about 10% or less, the water running (water leakage) force S is generated. is there. On the other hand, the overlap width A is approximately 25. If it is set to / 0 or more, the thick part increases and the contact resistance increases.Therefore, considering the water stoppage and economy, it is recommended to set the overlap width A to about 15% or about 20%. preferable.
- the water expanding portion 4 is formed integrally with the entire inner peripheral surface of the joint main body la constituting the pipe joint 1, for example, the joint main body facing the insertion outer peripheral surface of the pipe 2
- the la may be integrally formed in the circumferential direction or the spiral direction with respect to the inner peripheral surfaces at both ends.
- the above-described structure can be obtained by overlapping both ends of the water-expandable nonwoven fabric 21 constituting the nonwoven sheet 23 vertically so that both ends of the non-expandable nonwoven fabric 22 are in contact with each other in the circumferential direction. Functions and effects substantially equivalent to those of the water expanding section 4 can be expected.
- the fixing force S can be fixed by using one or a plurality of fixing methods such as a method of bonding and fixing with an adhesive such as rubber glue, a method of suturing and fixing with a sewing machine, and a method of fixing with a stapler.
- the water expansion section 4 (see FIG. 44), which has been processed and wound into a substantially cylindrical shape, is mounted on the outer peripheral surface of the middle mold 27 constituting the molding machine 26.
- the outer mold 28 divided into a plurality (for example, divided into two) is fitted to the outer periphery of the divided middle mold 27, and the upper mold 29 is fitted to the upper end of the middle mold 27 and the outer mold 28.
- the water expansion part 4 attached to the A predetermined amount of synthetic resin heated and melted at a predetermined temperature is injected into a space formed between the facing surfaces of the mold 28 and the upper mold 29, and the inner peripheral portion of the joint body la and the water expanding portion 4 is The outer peripheral portion of the joint body la and the water expanding portion 4 which were formed into a shape corresponding to the substantially spiral groove portion 27a formed on the outer peripheral surface of the middle mold 27 and were formed integrally were formed on the inner peripheral surface of the outer mold 28. It is formed into a shape corresponding to the substantially spiral protrusion 28a.
- the overlapping portion 23b of both ends 23a, 23a constituting the nonwoven sheet 23 is pressed in the radial direction and the thickness direction by the pressure applied during molding and injection of the synthetic resin, and the overlapping portion is formed.
- 23b is integrally molded to a thickness substantially uniform in the circumferential direction and the length direction (see FIG. 47).
- the overlapping portion 23b of the nonwoven sheet 23 constituting the water expanding portion 4 is formed to have a substantially uniform thickness and then integrally formed with the inner peripheral surface of the joint body la, the nonwoven sheet 23 The overlapping portion is further compressed by the pressure applied during the second molding (for example, the pressure at the time of molding and the injection pressure at the time of injection of the synthetic resin), and becomes thinner than at the time of the first molding.
- the pressure applied during the second molding for example, the pressure at the time of molding and the injection pressure at the time of injection of the synthetic resin
- the overlapped portion 23b of the non-woven sheet 23 is integrated with the inner peripheral surface of the joint body la that constitutes the pipe joint 1 because the water stoppage is impaired. It is preferable to mold to a substantially uniform thickness by one molding pressure applied at the time of molding.
- the non-expandable nonwoven fabric 22 constituting the water-swelling portion 4 is integrally fixed to the entire inner peripheral surface of the joint body la constituting the pipe joint 1, and the entire water-swelling portion 4 is circumferentially fixed. And a thickness that is substantially uniform in the longitudinal direction, and a thickness that allows a substantially uniform clearance to be formed with respect to the outer peripheral surface of the tube 2.
- the outer mold 28 ... and the upper mold 29 are separated, and the middle mold 27 ... is divided into a plurality of pieces.
- the pipe joint 1 in which the water expansion section 4 is formed is separated and extracted from the middle mold 27, the forming operation of the pipe joint 1 shown in FIG. 48 is completed.
- the pipe joint 1 in which the water expansion section 4 is formed in a body can be rotated in a helical direction and separated from the middle mold 27.
- the pipe joint 1 for connecting the pipe bodies 2, 2 having various diameters is manufactured.
- both ends 23a, 23a of the nonwoven sheet 23 that constitutes the water expanding section 4 are substantially evenly spaced. Force to overlap in the state where it is formed into a thickness, and both ends 23a, 23a are overlapped with the overlap width A so that the thickness is formed to be approximately uniform in the circumferential direction and integrated with the inner peripheral surface of the pipe joint 1. Molding allows the entire water swelling section 4 to be formed to a substantially uniform thickness, and when absorbing moisture, the entire water swelling section 4 expands to a substantially uniform thickness in the circumferential direction. It is possible to positively prevent the penetration of water and the penetration of water that does not cause water running (water leakage) at the overlapping portion 23b of the portion 4 without causing a gap.
- the water expanding portion corresponds to the water expanding portion 4 and the water expanding nonwoven fabric 4a,
- the holding interposition part corresponds to the holding interposition part 5 and the interposition nonwoven fabric 5a,
- the exterior part corresponds to the exterior part 8 and the interposed nonwoven fabric 8a,
- the water expanding material corresponds to the water expanding material 6 and the water expanding fiber 14,
- the present invention is not limited only to the above configuration.
- FIG. 1 is a perspective view of a pipe joint according to a first embodiment.
- FIG. 2 is a perspective view of a pipe joint and a pipe body.
- FIG. 3 is a cross-sectional view showing a connection state of a pipe by a pipe joint.
- FIG. 4 is a cross-sectional view when water is stopped.
- FIG. 5 (a) is an explanatory view showing a binding state by a binder, and (mouth) is an explanatory view at the time of fiber expansion.
- FIG. 6 (a) is an explanatory diagram of a base fiber and a water-swelling fiber, (port) is an explanatory diagram showing a bonded state by soft siding, and (c) is an explanatory diagram of a fiber expansion.
- FIG. 7 (a) is an explanatory view showing the bonding state between the base fiber and the liquid water-absorbent resin, and (mouth) is an explanatory view when the water-absorbent resin is expanded.
- FIG. 8 is a perspective view of a pipe joint and a pipe according to a second embodiment.
- FIG. 9 is a cross-sectional view showing a connection state of a pipe by a pipe joint.
- FIG. 10 is a cross-sectional view when water is stopped.
- FIG. 11 is a cross-sectional view showing a state in which a tube butt portion is offset to one side.
- FIG. 12 is a cross-sectional view of the structure of FIG. 11 when water is stopped.
- FIG. 13 is a sectional view showing another embodiment of the pipe joint.
- FIG. 14 is a cross-sectional view of the structure of FIG. 13 when water is stopped.
- FIG. 15 is a sectional view showing still another embodiment of the pipe joint.
- FIG. 16 is a cross-sectional view of the structure of FIG. 15 when water is stopped.
- FIG. 17 is an enlarged sectional view showing a dimensional relationship between a pipe joint and a pipe body.
- FIG. 18 is a sectional view taken along line XX of FIG. 9.
- FIG. 19 is an explanatory diagram showing a state in which a water swelling portion is joined by a binder.
- FIG. 20 is an explanatory view at the time of fiber expansion.
- FIG. 21 is a partially enlarged sectional view showing still another embodiment of the pipe joint.
- FIG. 22 is a partially enlarged sectional view showing still another embodiment of the pipe joint.
- FIG. 23 is a side view of a pipe joint and a pipe according to a third embodiment.
- FIG. 24 is an explanatory view of a structure of a water stop function layer.
- FIG. 25 is a perspective view of members constituting a water blocking function layer.
- FIG. 26 is a cross-sectional view showing a connected state of a tube.
- FIG. 27 is an explanatory view of an operation state of a water stoppage function layer.
- FIG. 28 is an explanatory diagram of a method of connecting pipes.
- FIG. 29 is a structural explanatory view of another example of the water stoppage function layer.
- FIG. 30 is an explanatory view of the structure of a water stop function layer of another example.
- FIG. 31 is a sectional view of a pipe joint according to another example.
- FIG. 32 is a perspective view of members constituting the water blocking function layer of FIG. 31.
- FIG. 33 is a cross-sectional view of a pipe joint according to another example.
- FIG. 34 is an explanatory view of the structure of a water blocking function layer according to another example.
- FIG. 35 is an explanatory view of the structure of a water stoppage function layer according to a fourth embodiment.
- FIG. 36 is an explanatory view of an operation state of a water stoppage function layer.
- FIG. 37 is a structural explanatory view of a water stop function layer of another example.
- Garden 38 Structure explanatory view of another example of the water stoppage function layer.
- FIG. 39 is a cross-sectional view of a pipe joint according to another example.
- FIG. 44 is a perspective view showing a step of winding the water expanding portion into a substantially cylindrical shape.
- FIG. 46 is a cross-sectional view showing a state where a water expansion section is integrally formed with the inner peripheral surface of the pipe joint.
- FIG. 48 is a cross-sectional view showing a formed pipe joint in which a water expansion section is integrally formed on an inner peripheral surface.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joints That Cut Off Fluids, And Hose Joints (AREA)
- Joints With Sleeves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
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JP2003132622A JP4297329B2 (ja) | 2003-05-12 | 2003-05-12 | 管継手 |
JP2003-132622 | 2003-05-12 | ||
JP2003132908A JP4297331B2 (ja) | 2003-05-12 | 2003-05-12 | 管継手 |
JP2003132623A JP4297330B2 (ja) | 2003-05-12 | 2003-05-12 | 管継手 |
JP2003-132908 | 2003-05-12 | ||
JP2003132624A JP2004336955A (ja) | 2003-05-12 | 2003-05-12 | 管継手 |
JP2003-132907 | 2003-05-12 | ||
JP2003-132624 | 2003-05-12 | ||
JP2003132907A JP4267964B2 (ja) | 2003-05-12 | 2003-05-12 | 管継手 |
JP2003-132623 | 2003-05-12 |
Publications (2)
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WO2004099659A2 true WO2004099659A2 (ja) | 2004-11-18 |
WO2004099659A3 WO2004099659A3 (ja) | 2005-03-31 |
Family
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/006250 WO2004099659A2 (ja) | 2003-05-12 | 2004-05-11 | 管継手 |
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KR (1) | KR100847323B1 (ja) |
WO (1) | WO2004099659A2 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008129261A3 (en) * | 2007-04-18 | 2008-12-11 | Design Tech & Innovation Ltd | Connector |
IT201800010635A1 (it) * | 2018-11-28 | 2020-05-28 | Deregibus Tubigomma | Porzione di raccordo di un tubo multistrato, particolarmente per fluidi chimici e alimentari |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102119590B1 (ko) * | 2018-08-08 | 2020-06-05 | (주)태영피앤엑스 | 딤플플랜지 파형강관 이음 구조 및 그 방법 |
KR102002827B1 (ko) * | 2018-11-27 | 2019-07-24 | 한국건설기술연구원 | 3d 프린터를 이용하여 제작한 녹화용 담장 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002333086A (ja) * | 2001-05-10 | 2002-11-22 | Yasutada Iwaguchi | 管継手 |
JP2003120870A (ja) * | 2001-10-11 | 2003-04-23 | Bridgestone Corp | 螺旋状山形リブを持つ大型樹脂管のシール方法 |
-
2004
- 2004-05-11 KR KR1020057021511A patent/KR100847323B1/ko not_active IP Right Cessation
- 2004-05-11 WO PCT/JP2004/006250 patent/WO2004099659A2/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002333086A (ja) * | 2001-05-10 | 2002-11-22 | Yasutada Iwaguchi | 管継手 |
JP2003120870A (ja) * | 2001-10-11 | 2003-04-23 | Bridgestone Corp | 螺旋状山形リブを持つ大型樹脂管のシール方法 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008129261A3 (en) * | 2007-04-18 | 2008-12-11 | Design Tech & Innovation Ltd | Connector |
AP2727A (en) * | 2007-04-18 | 2013-08-31 | Design Technology And Innovation Ltd | Connector |
IT201800010635A1 (it) * | 2018-11-28 | 2020-05-28 | Deregibus Tubigomma | Porzione di raccordo di un tubo multistrato, particolarmente per fluidi chimici e alimentari |
EP3660379A1 (en) * | 2018-11-28 | 2020-06-03 | Tubigomma Deregibus S.r.l. | Connecting portion of a multilayer tube, particularly for chemical and food-related fluids |
EP3660379B1 (en) * | 2018-11-28 | 2022-07-27 | Tubigomma Deregibus S.r.l. | Connecting structure of a multilayer tube, particularly for chemical and food-related fluids |
Also Published As
Publication number | Publication date |
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KR100847323B1 (ko) | 2008-07-21 |
KR20060009013A (ko) | 2006-01-27 |
WO2004099659A3 (ja) | 2005-03-31 |
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