JP2005337403A - Pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe fitting capable of surely following displacement when relative positions of both of pipes are displaced and capable of preventing breakdown of a pipe main body. <P>SOLUTION: The pipe fitting is provided with a flexible short pipe main body, a pair of flanges to be respectively installed in opposite ends of pipes provided in both ends of this pipe main body, and a rope member for connecting both the flanges to each other. Each of the flanges has a plurality of circular flange pieces and connecting bolts for connecting these flange pieces to each other, and the flanges are integrated by the connecting bolts, and a main body of the rope member is inserted into a through hole formed in the connecting bolt, and both ends of the rope main body are provided with a stopper with the predetermined interval from the through hole. With this structure, when relative positions of both the pipes are displaced, the pipe main body and the rope member can follow the displacement, and at the same time, the flange slides to the rope member to regulate the maximum displacement quantity in length of the pipe main body, and breakdown of the pipe fitting can be thereby prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe joint, for example, a pipe joint that connects pipes embedded in the ground.

  Conventionally, water pipes, gas pipes, and the like are buried in building sites and roads. These pipes are formed by connecting to a plurality of pipes via pipe joints. The pipe joint includes a flexible pipe main body, and a splittable flange attached to both ends of the pipe main body. The pipe main body includes a cylindrical portion and a flange portion. By engaging with a tube body mounting portion that is recessed along the inner periphery, it is connected to the flange. The flange has a mounting hole, and a mounting bolt is inserted into the mounting hole and connected to the pipe.

  Therefore, the above pipe joint can follow this deviation even if the relative position between the pipes is displaced in the axial direction due to, for example, an earthquake, or in the direction orthogonal to the axial direction. However, with this pipe joint, if a large earthquake occurs and a sudden tensile load is applied to the pipe body, the pipe joint may break, ensuring reliability for long-term use. It was difficult.

In order to solve this problem, a pipe joint has been proposed in which flanges attached to both ends of a pipe joint are connected with long bolts (generally referred to as tie rods), and the pipe length of the pipe body can be kept constant (for example, Patent Document 1).
Japanese Utility Model Publication No.59-13785

  However, the pipe joint in which the flanges are connected by tie rods can suppress the axial extension of the pipe joint, but if the pipe joint is eccentric due to ground subsidence or the like on one connected pipe side, Since the pipe joint is inclined to follow, the portion connected to the flange of the tie rod is bent. Further, since the pipe joint is inclined, the pipe is drawn into the pipe joint side. For this reason, an excessive force may be applied to the pipe joint, pipe, and tie rod, which may cause damage.

  An object of the present invention is to provide a pipe joint that can reliably follow this deviation when the relative positions of the pipes are deviated and can prevent damage to the pipe body.

  More specifically, the present invention provides the following.

  (1) A pipe joint for connecting pipes whose ends are arranged to face each other, a flexible short tubular pipe body, and opposite ends of the pipe provided at both ends of the pipe body Each of the flanges, and a string member that connects the flanges, and each of the flanges has an annular shape, and is divided into a plurality of pieces formed along a line extending in the radial direction from the substantial center thereof. An arc-shaped flange piece and a connecting bolt for connecting the flange pieces to each other. Ear ends having connecting holes are formed at both ends of the flange piece, and the connecting holes of the ear parts adjacent to each other are formed. The flange pieces are integrated by inserting the connecting bolts into the connecting holes along the longitudinal direction of the tube body, and a through-hole penetrating in the longitudinal direction is formed in the connecting bolt. And said Pipe joint having members and strap body is inserted into the through hole, and stop provided in advance a predetermined distance from said through hole at both ends of the cord body.

  According to the present invention, the pipe main body constituting the pipe joint is made flexible, and the pair of flanges provided at both ends of the pipe main body can be respectively attached to the opposite ends of the pipe. The two pipes can be securely connected. Therefore, when the relative positions of the pipes are shifted or inclined and the angular deformation occurs, the pipe main body is deformed, and the displacement and the angular deformation can be reliably followed. At this time, since the flanges are connected by the string member, the string member follows the displacement and the angular deformation together with the pipe body.

  In addition, since the connecting bolt overlaps the ears formed at both ends of the adjacent flange pieces and is inserted into the connecting hole to connect the flange pieces, the connecting bolt is connected to the pipe body. It will be in the state extended along the direction, and by attaching a string member to a connecting bolt, both flanges will be connected by a string member. Therefore, the two functions of connecting the flange pieces and connecting the two flanges with the string member using one connecting bolt are performed, so that the number of parts can be reduced and the cost can be reduced. Further, the pipe joint is not manufactured by integrating the flange and the pipe body, but the pipe body is engaged with a separable flange formed from a plurality of flange pieces, so that a complicated mold is used. It is not necessary and can be mass produced at low cost.

  In addition, since the distance between the fasteners of the string member is longer than the distance between both flanges, the string member can absorb this deformation even if the pipe sinks due to ground subsidence due to an earthquake and the pipe body deforms long. . That is, when the pipe joint is eccentric due to ground subsidence, etc., the pipe joint is inclined to follow this, but since the flange can slide with respect to the string member, the pipe connected to the pipe joint is drawn into the pipe joint side. Therefore, there is no risk of breakage because there is no excessive force on the pipe joint and piping. Moreover, since the maximum displacement amount of the length of the pipe body is regulated by the stopper provided on the string member, the pipe body is prevented from being broken. The distance between the stoppers is appropriately selected within the range of the extension amount in which the pipe joint does not extend and break.

  (2) The pipe joint according to (1), wherein the string member is formed by twisting a plurality of strands.

  According to this invention, since the string member is formed by twisting a plurality of strands, the strength against tensile force can be improved. Accordingly, when the relative position between the pipes is shifted or bent, even if the string member receives a tensile force and is strained, the pipe length can be maintained constant over a long period of time.

  (3) The said string member is a pipe joint as described in (1) or (2) which is metal.

  According to this invention, the string member is made of metal. Since the metal has malleability and ductility, breakage of the string member can be suppressed.

  (4) The pipe joint according to any one of (1) to (3), wherein the string body is a wire rope.

  According to this invention, since the wire rope is used for the string body, disconnection due to bending fatigue or the like can be suppressed. Therefore, the string member is excellent in durability and can be used stably over a long period of time.

  (5) The pipe joint according to any one of (1) to (4), wherein the flange is formed with a plurality of depressions.

  According to this invention, since the plurality of depressions are formed in the flange, the depressions can reduce the weight of the flange. Therefore, the weight of the entire pipe joint can be reduced.

  According to the pipe joint of the present invention, the pipe main body constituting the pipe joint is made flexible, and a pair of flanges provided at both ends of the pipe main body can be attached to opposite ends of the pipe. Two pipes can be reliably connected via the joint. Therefore, when the relative positions of the pipes are shifted or inclined and the angular deformation occurs, the pipe main body is deformed and can reliably follow the shift and the angular deformation. At this time, since the flanges are connected by the string member, the string member can follow the displacement and the angular deformation together with the pipe body. Simultaneously with this follow-up, the flange can slide against the string member and prevent the flange interval from decreasing, and even when a large earthquake occurs and a sudden tensile load is applied to the pipe body part, Since the maximum displacement amount of the length of the pipe body is regulated by the tension of the string member, there is no possibility that the pipe joint or the pipe is broken.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified. In these drawings, the dimensions are appropriately adjusted for easy understanding.

  FIG. 1 shows a front view of a pipe joint 1 according to an embodiment of the present invention. FIG. 2 shows a cross-sectional view in the A-A ′ direction of FIG. 1.

  The pipe joint 1 includes a pipe body 10, a pair of flanges 20, and a wire rope 30a as a string member.

  The tube body 10 has a cylindrical shape, and a central portion in the axial direction bulges outward. The tube main body 10 includes a tube portion 11 and a flange portion 12. The cylindrical portion 11 and the flange portion 12 are integrally formed by an elastic member 13 such as rubber reinforced by a reinforcing fiber 13a such as a tire cord, and a metal reinforcing ring 14 is incorporated in the flange portion 12. Therefore, the tube main body 10 formed from the cylindrical portion 11 and the flange portion 12 has flexibility due to the elastic member 13. The elastic member 13 preferably covers the inner wall surface of a rubber layer made of synthetic rubber or the like with a material having excellent heat resistance and chemical resistance such as fluororesin (Teflon (registered trademark)).

  The flange 20 has an annular shape, and includes two arc-shaped flange pieces 21A, a flange piece 21B, and a connecting bolt 24 that connects the flange pieces 21A and 21B.

  The flange pieces 21 </ b> A and 21 </ b> B are divided and formed by a straight line L extending in the radial direction from the approximate center of the flange 20. The flange pieces 21A, 21B are formed with tube body mounting portions 15 that are recessed along the inner circumference with a depth smaller than the thickness of the flange portion 12 of the tube body 10. The flange 12 of the tube body 10 is engaged with the tube body mounting portion 15. The flange pieces 21A and 21B have mounting holes 27 formed at predetermined intervals (in the present embodiment, one circular hole is formed in the middle portion and two semicircular holes are formed in both end portions. ) And a recess 28 formed on one end surface side of the mounting hole 27. A mounting bolt 44 described later is inserted into the mounting hole 27. Further, the flange pieces 21 </ b> A and 21 </ b> B are formed with recesses 29 that are recessed in the thickness direction between the mounting holes 27. By this hollow portion 29, the flange pieces 21A and 21B are reduced in weight. Further, at both ends of the flange pieces 21A and 21B, ear portions 22A and 22B are formed to protrude outward with a thickness approximately half that of the flange pieces 21A and 21B. The flange pieces 21A and 21B form the annular flange 20 by overlapping the adjacent ear portions 22A and 22B. These ears 22 </ b> A and 22 </ b> B have connection holes 23.

  The connecting bolt 24 is inserted into a connecting hole 23 in which the ear portions 22A and 22B of the flange pieces 21A and 21B overlap and communicate with each other. A nut 26 is screwed to the tip of the connecting bolt 24 with a washer 25 interposed therebetween. Thus, the ear portions 22A and 22B of the flange pieces 21A and 21B adjacent to each other are connected to each other, and the flange pieces 21A and 21B are integrated to form the annular flange 20. Further, the connection bolt 24 is formed with a through hole 24a penetrating in the longitudinal direction.

The string member 30 includes a wire rope 30a formed by twisting a plurality of metal strands, and a stopper 30b provided at both ends of the wire rope 30a. The wire rope 30 a is provided so as to pass through the through hole 24 a of the connecting bolt 24 and connect the pair of flanges 20 of the pipe joint 1. Both end portions of the wire rope 30a is in a position apart a predetermined distance D ₂ outward from the distal end of the connecting bolt 24 (the opposite direction of the pipe body), the stop 30b of Ryakudama shaped as wire rope 30a does not come out is Is provided. Thereby, the string member 30 has connected the flanges 20 mutually. The predetermined distance D _2, when the case or inclined pipe has subsided by ground subsidence or the like caused by an earthquake occurs, between the pipe main body 10 to follow the angular deformation due to the deviation or inclination due to subsidence absorb to extension flange The distance D ₁ (see FIG. 3) is provided so as not to decrease. The distance D ₁ is appropriately selected within the range of the extension amount that does not damage the tube body 10 depending on the properties of the tube body 10 and the design of the displacement to be absorbed. In this embodiment, the string body of the string member is a wire rope. However, the present invention is not limited to this, and any string may be used as long as it has strong strength against tensile force and can be deformed. May be.

  The above pipe joint 1 connects two pipes 40 together. As shown in FIG. 3, the pipe 40 includes a pipe cylinder part 41 and a pipe flange part 42. The pipe flange 42 has a bolt hole 43.

  A mounting bolt 44 is inserted into the mounting hole 27 of the flange 20 and the bolt hole 43 of the pipe 40. A nut 46 is screwed onto the tip of the mounting bolt 44 with a washer 45 interposed therebetween. Thereby, the pipe joint 1 is attached to each pipe 40.

  A procedure for mounting the pipe joint 1 to the pipe 40 will be described.

  First, the flange pieces 21A and 21B are combined in an annular shape while sandwiching the flange portions 12 at both ends of the tube body 10 with the arc-shaped flange pieces 21A and 21B. Thereby, the collar part 12 is engaged with the pipe main body mounting part 15 of the flange pieces 21A and 21B.

  Next, the connecting bolt 24 is inserted into the connecting hole 23 formed in the overlapping ear portion 22A, 22B of the flange pieces 21A, 21B, and screwed with the nut 26 with the washer 25 interposed therebetween. Thereby, the flange piece 21A and the flange piece 21B are connected, and the flange 20 is formed. That is, a pair of flanges 20 are formed at both ends of the tube body 10.

Subsequently, the wire rope 30 a is inserted into the through holes 24 a of the connecting bolts 24 attached to the pair of flanges 20 to connect the flanges 20. At this time, fixed by by inserting a stop 30b of the substantially spherical from both ends of the wire rope 30a welding or the like (predetermined distance D ₂ position spaced outwardly from the tip portion of the connection bolt 24) position. Thereby, the pipe joint 1 is completed.

  Next, the pipe joint 1 assembled as described above is arranged so that the mounting hole 27 of the pipe joint 1 and the bolt hole 43 of the pipe 40 communicate with each other, and the mounting bolt 44 is inserted into the mounting hole 27 and the bolt hole 43. The nut 46 is screwed with the washer 45 in between. Thereby, the two pipes 40 are connected via the pipe joint 1.

  Furthermore, as shown in FIG. 4, the two pipes 40 may be connected by a mounting bolt 44. That is, as in the case of the connecting bolt 24, a through hole that penetrates the mounting bolt 44 in the longitudinal direction is formed, and a wire is connected to the through hole formed in the mounting bolt 44 so as to connect between the flanges 20 of the pipe joint 1. The rope 30a may be inserted, and the stopper 30b may be attached to both ends of the wire rope 30a to connect the two pipes 40 together. As a result, when the relative positions of the pipes 40 are shifted or bent, the string member 30 provided in the pipe joint 1 and the string member 30 provided between the pipes 40 are tensioned together, and the pipe joint 1 Elongation can be more strongly regulated. Incidentally, the stopper 30b of the string member 30 provided between the pipes 40 is separated from the end of the mounting bolt 44 by substantially the same distance outward as the stopper 30b of the string member 30 provided in the pipe joint 1. However, the present invention is not limited to this.

  Next, the operation of the pipe joint 1 will be described.

  First, FIG. 5 shows a state in which the relative positions of the pipes 40 according to the present embodiment are shifted. When the relative position between the pipes 40 is shifted in the direction B in FIG. 5, the pipe body 10 is also inclined and deformed following this, but the flange 20 slides relative to the wire rope 30 a at this time. Since the pipe 40 connected to the pipe joint 1 is not drawn into the pipe joint 1 side, there is no possibility that the pipe joint 1 and the pipe 40 are damaged. Moreover, since the maximum displacement amount of the length of the pipe body 10 is regulated by the stopper 30b provided on the wire rope 30a, the pipe body 10 is prevented from being broken.

Next, FIG. 6 illustrates a state in which the relative positions of the pipes 40 according to the present embodiment are inclined. When the relative position between the pipes 40 is inclined in the direction C in FIG. 6, the pipe body 10 is also deformed and follows. At this time, the wire rope 30 a also follows the tension with the tube body 10 and resists deformation of the tube body 10. That is, in FIG. 6, when the relative position between the pipes 40 is inclined, the upper side of the pipe body 10 is extended following this, but a predetermined amount (distance D ₂ between the connecting bolt 24 and the stopper 30 b shown in FIG. 3). The string member 30 is tensioned in an extended state, and further extension is restricted. As a result, the maximum amount of displacement of the length of the tube body 10 is maintained in a range where the tube body 10 is not damaged, so that the tube body 10 is prevented from being damaged.

  Therefore, according to this embodiment, there are the following effects.

Since the pipe main body 10 constituting the pipe joint 1 is made flexible and the pair of flanges 20 provided at both ends of the pipe main body 10 can be respectively attached to the opposite ends of the pipe 40, Thus, the two pipes 40 can be reliably connected. Therefore, when the relative positions of the pipes 40 are displaced or bent, the tube body 10 can be deformed to follow the displacement or bending. At this time, since the flanges 20 are connected to each other by the string member 30, the string member 30 also follows the displacement and the like together with the pipe body 10, and at the same time, the flange 20 is stopped against the wire rope 30a by the deformation of the tube body 10. Slide to tool 30b. Thus, string member 30 is under tension, decrease the spacing D ₁ of the between the flanges 20 is prevented, since the maximum displacement of the length of the tube body 10 is restricted, fracture of the pipe main body 10 is prevented.

  Further, the connecting bolt 24 is inserted through the connecting holes 23 of the ear portions 22A and 22B of the flange pieces 21A and 21B to connect the flange pieces 21A and 21B. The string member 30 can be connected to the flange 20 by inserting the wire rope 30 a through the through holes 24 a formed in the connection bolt 24 and communicating between the connection bolts 24. Therefore, since the two functions of connecting the flange pieces 21A and 21B and connecting the string member 30 and the flange 20 are performed by using one connecting bolt 24, the number of parts can be reduced and the cost can be reduced. In addition, the pipe joint 1 is not manufactured by integrating the flange 20 and the pipe body 10, but engages the pipe body 10 with the separable flange 20 formed from a plurality of flange pieces 21 </ b> A and 21 </ b> B. Therefore, it is not necessary to use complicated molds and can be mass-produced at low cost.

  In addition, since the plurality of depressions 29 are formed in the flange 20, the depressions 29 can reduce the weight of the flange 20. Therefore, the weight of the entire pipe joint 1 can be reduced.

  Moreover, since the wire rope 30a of the string member 30 is made of metal formed by twisting a plurality of strands, it has malleability and ductility, can suppress breakage due to bending fatigue, etc., and has strength against tensile force Becomes stronger. Therefore, even if the relative positions of the pipes 40 are shifted or bent, the pipe length of the pipe body 10 can be maintained constant over a long period of time even if the string member 30 receives a tensile force and is strained.

  It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.

  For example, in the said embodiment, although the flange 20 was formed from two flange pieces 21A and 21B, you may form not only this but three or more circular-arc-shaped flange pieces. Moreover, although the flange 20 was made into an annular shape, it is not limited to this, and may be a polygonal shape. In addition, the flange pieces 21A and 21B are overlapped and connected at the ear portions 22A and 22B, but both end portions of the flange pieces 21A and 21B have a thickness of about ½ so that these portions are also overlapped. Also good. Moreover, although the pipe body 10 is the elastic member 13 such as a rubber layer, the present invention is not limited thereto, and a metal bellows pipe or the like may be used.

  The pipe joint of the present invention can be used for a pipe joint for connecting pipes embedded in the ground.

It is a front view of a pipe joint concerning an embodiment of the present invention. It is A-A 'sectional drawing of FIG. It is sectional drawing of the state with which the pipe joint which concerns on the said embodiment was mounted | worn with piping. It is sectional drawing of another embodiment with which the pipe joint which concerns on the said embodiment was mounted | worn with piping. It is a figure which shows the state which the relative position of piping which concerns on the said embodiment shifted | deviated. It is a figure which shows the state which the relative position of piping which concerns on the said embodiment inclined.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe joint 10 Pipe main body 20 Flange 21A, 21B Flange piece 22A, 22B Ear part 23 Connection hole 24 Connection bolt 24a Through-hole 29 Depression part 30 String member 30a Wire rope (string main body)
30b Stopper 40 Piping

Claims (5)

A pipe joint for connecting pipes whose ends are arranged to face each other,
A flexible short tube main body, a pair of flanges provided at both ends of the pipe main body and respectively attached to opposing ends of the pipe, and a string member connecting the flanges,
Each of the flanges has an annular shape, and has a plurality of arc-shaped flange pieces divided and formed along a line extending in the radial direction from the approximate center thereof, and a connecting bolt for connecting the flange pieces, Ear portions having connection holes are formed at both ends of the flange piece, the connection holes of the ear portions adjacent to each other are overlapped, and the connection bolts are connected to the connection holes along the longitudinal direction of the tube body. The flange pieces are integrated by inserting,
The connecting bolt is formed with a through-hole penetrating in the longitudinal direction, and the string member includes a string main body inserted into the through-hole, and a stopper provided at both ends of the string main body at a predetermined interval from the through hole. And a pipe joint having the tool.   The pipe joint according to claim 1, wherein the string member is formed by twisting a plurality of strands.   The pipe joint according to claim 1 or 2, wherein the string member is made of metal.   The pipe joint according to any one of claims 1 to 3, wherein the string body is a wire rope.   The pipe joint according to any one of claims 1 to 4, wherein a plurality of depressions are formed in the flange.

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