JP2005048886A - Flexible joint for pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain sufficient strength for soil pressure and water pressure, withstand shearing force of a joint part 2, adapt an annular elastic water cut-off body to traction force and compression force, and cut off water sufficiently. <P>SOLUTION: This flexible joint for the pipe is constituted in such a way that small diameter pipes 4, 4' are formed in the opposing direction in end parts of equal diameter pipes in the joint part 2 of equal diameter pipe main bodies 1, 1' using stepped faces 3, 3' as a boundary, a metallic cylinder 5 covering the outer periphery of the equal diameter pipe main body 1' on the other side is extended toward the outer periphery of the stepped face 3 of the equal diameter pipe main body 1 on one side, the annular elastic water cut-off body 6 made of rubberlike elastic body is stored in an annular space s surrounded by the outer peripheries of both of the small diameter pipes 4, 4', the metallic cylinder 5, and both of stepped faces 3, 3', a terminal part 6' of the water cut-off body 6 is fixed to an outer peripheral face of the small diameter pipe 4 on one side, and a main body part 6" of the water cut-off body 6 is brought into pressure contact with an inner peripheral face of the metallic cylinder 5 and outer peripheral faces of the other or both of small diameter pipes 4, 4' slidably. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a flexible joint such as a fume pipe that is propelled or buried in soil, and relates to a technical field that sufficiently performs water-stopping and waterproofing of a joint portion.

  Conventionally, a flexible joint is used for a fume pipe or the like buried in the soil. This flexible joint is provided at the connecting part of the pipe, and absorbs displacement and vibration such as bending and eccentricity of the pipe caused by ground fluctuation, earthquake, etc., and prevents breakage and leakage of the pipe. (For example, patent document 1).

  By the way, in Patent Document 1, the joint is in the form of a rubber thin film, and sufficient strength against external pressure such as earth pressure, internal water pressure or the like cannot be obtained and there is a risk of breakage.

  In addition, since the joint is made of a rubber thin film, a shearing force is generated in the connecting part of the tube due to external pressure, and the connecting position of the tube is displaced in the radial direction, so that there is a risk that the flow path cannot be secured sufficiently and the flow down function is hindered. .

  Further, since flexibility is obtained by expansion and contraction (deformation) of rubber, there is a problem that the life is reduced due to fatigue of rubber.

Japanese Utility Model Publication No. 4-10468 (FIG. 1 1. Fume tube, 2. Flexible tube, 4. Ring body, 5. weak body part, 5a ... punching hole)

  The present invention provides sufficient flexibility against earth pressure and water pressure, withstands the shearing force of the joint, and the annular elastic waterstop adapts to the traction force and compressive force, and also has sufficient flexibility for water stopping. The object is to provide a joint.

In order to achieve the above object, according to the present invention, firstly, in the joint portion of the equal-diameter pipe body, a small-diameter pipe is formed in the opposing direction at the step surface at the end of the equal-diameter pipe body, An annular space in which the metal cylinder located in the outer peripheral direction of the small-diameter tube extends toward the outer periphery of the step surface of one of the equal-diameter tube bodies, and is surrounded by the outer periphery of both small-diameter tubes, the metal cylinder, and both step surfaces An annular elastic waterstop made of a rubber-like elastic body is housed inside, the base end of the waterstop is fixed to the outer peripheral surface of one small-diameter pipe, and the main body of the waterstop is connected to the inner peripheral surface of the metal cylinder. And a flexible joint for pipes slidably pressed against the outer peripheral surface of the other or both small-diameter pipes,
Secondly, a collar is fitted over the outer circumference of both the pipe main bodies and the outer circumference of the metal cylinder, and the collar is provided between the extended end of the metal cylinder and the step surface of one of the equal diameter pipe main bodies. The flexible joint for pipes according to the first invention, wherein a plurality of small slits are formed in a plurality of rows at staggered positions in the circumferential direction at opposing positions, and the small slit portions are formed to be expandable and contractible.
Thirdly, the inner circumference of the metal disk covering each of the two step surfaces and the metal small diameter cylinder covering the outer circumference of both small diameter pipes are welded together, and the outer circumference of one metal disk and one of the above pipes are welded together. The first or second invention, wherein a metal cylinder covering the outer periphery of the main body is welded, and the outer periphery of the metal facing disk covering the opposing surfaces of both small diameter tubes and the tip of the metal small diameter cylinder are welded. Flexible joints for pipes,
Fourthly, at least one of the inner and outer peripheral surfaces of the annular elastic waterstop is provided with the metal cylinder and one or a plurality of circumferential ridges that press against the outer peripheral surface of one or both small-diameter pipes, and the waterstop is made of the metal The flexible joint for pipes according to any one of the first to third inventions, wherein a folded edge is formed in pressure contact with an inner peripheral surface of a cylinder or an outer peripheral surface of the small-diameter pipe,
Consists of.

  In the present invention, the annular elastic waterstop is pressed against the inner peripheral surface of the metal cylinder and the outer peripheral surface of the small-diameter pipe, so that water can be sufficiently stopped, and the annular elastic waterstop is composed of the metal cylinder and the small-diameter pipe. By being protected, sufficient strength against earth pressure and water pressure can be obtained. Further, since the annular elastic waterstop slides with respect to the bending of the tube body, sufficient strength can be obtained without being greatly deformed. Furthermore, with respect to the shear force generated in the joint portion, the metal cylinder is extended to one small-diameter pipe, and an annular elastic waterstop is interposed between the metal cylinder and the one small-diameter pipe, so that the joint portion is There is no significant shift in the radial direction.

  Moreover, by providing the collar which fits into both pipe main bodies, while being able to connect both pipe main bodies easily, a joint part is protected and the bending at the time of a propulsion or embedding of a pipe is prevented.

  Further, by welding a metal disk and a metal small diameter cylinder, a metal disk and a metal cylinder, and a metal counter disk and a metal small diameter cylinder, the parts can be integrated to reduce the manufacturing man-hours and management man-hours.

  Moreover, by providing a circumferential protrusion on the annular elastic waterstop, the contact pressure can be increased to improve the sealing performance, and the sliding resistance of the annular elastic waterstop can be reduced. Furthermore, sealing property can be improved by providing a folding edge.

  When the propulsion pipe or buried pipe bends in the joint part of the pipe due to fluctuations in the earth pressure, geology, groundwater, etc. in the underground propulsion pipe or buried pipe, the joint part is not damaged and bent according to the above fluctuation, and the bent part In addition to being able to maintain a state in which there is no fear of being flooded from the joint even if water pressure is applied to it, the propulsion or embedment state is maintained without fear of water leakage or flooding without being damaged by the shearing force in the fluctuating portion.

  In underground pipes or underground propulsion pipes made of cement concrete, resin concrete, etc., pipe bodies 1 and 1 'with the same diameter are connected by flexible joints 2, and fluctuations in ground pressure, ground hardness, etc. It comes to correspond to.

  In the joint portion 2, the equal-diameter pipe main bodies 1 and 1 ′ each have a reduced diameter step, and the small-diameter pipes 4 and 4 ′ are opposed to each other with the step surfaces 3 and 3 ′ orthogonal to the center line c. Protrusions are formed.

  One of the small-diameter tubes 4 and 4 ′ (on the right side in FIG. 1 (a)) is formed shorter in the direction of the common center line than the other (on the left side in FIG. 1 (b)). However, the length of the small diameter tube is determined according to the sliding amount of the annular elastic waterstop, etc., and the lengths of both small diameter tubes may be the same.

  A metal cylinder 5 (stainless steel cylinder) covering the outer periphery of the small-diameter pipe 4 ′ of the other (left) pipe body 1 ′ is extended toward the right step surface 3.

  An external communication gap T is interposed between the extended end 5 ′ and one step surface 3, and the opposing ends 4 a and 4 b of both small-diameter pipes 4 and 4 ′ are in this state via a packing (cushion material) 9. Touching.

  The metal discs 3a and 3b for covering the stepped surfaces 3 and 3 'and the metal (stainless steel) small diameter tubes 4c and 4d for covering the outer circumferences of the small diameter tubes 4 and 4' are integrally welded to face each other. Metal (stainless) counter disks 4e and 4f covering the ends 4a and 4b, respectively, are welded to the tips of the small-diameter cylinders 4c and 4d, and one pipe body is provided on the outer periphery of the coated metal disk 3a on one step surface 3 A short cylinder 5 ″ covering 1 is welded.

Natural or synthetic rubber or the like in the annular space s surrounded by the inner peripheral surface of the metal cylinder 5, the coated metal disks 3a and 3b on both step surfaces 3 and 3 ', and the outer peripheral surfaces of the small metal tubes 4c and 4d An annular elastic waterstop 6 made of a rubber-like elastic body is accommodated,
The outer periphery of the base end portion 6 ′ of the water blocking body 6 is fastened and fixed to the outer peripheral surface of the base end portion of one (right side) small-diameter pipe 4 by the tightening band 10 in the communication gap T portion.

  The band 10 is formed by inserting bolts 11 into through holes formed in opposite plates 10 ", 10" provided at both ends of a pair of arc-shaped bands 10 ', 10' and tightening them with nuts. The base end portion 6 'of the elastic waterstop body 6 is fastened to the base portion of one (right side) small-diameter pipe 4 by fastening the arc-shaped bands 10' and 10 'by reducing the gap "". be able to.

  The outer peripheral surface of the main body 6 ″ of the waterstop body 6 is the inner peripheral surface of the metal cylinder 5, and the inner peripheral surface of the main body 6 ″ is the outer peripheral surface of the other (left side) or both small-diameter pipes 4, 4 ′. Water that enters the space s through the gap T can be stopped by pressing in a slidable manner. Sliding and water stopping can be improved by applying grease to the inner and outer peripheral surfaces of the water stopping body 6.

  As shown in FIG. 1 (b), the inner and outer peripheral surfaces of the waterstop 6 are slidably pressed against the inner peripheral surface of the metal cylinder 5 and the outer peripheral surfaces of one or both small-diameter tubes 4 and 4 '. The circumferential edge 6a is provided, the tip of the waterstop 6 is in contact with the disk 3b of the other step surface 3 ', and is further slidably pressed against the inner peripheral surface of the metal cylinder 5 6b is formed, and the ingress water can be more reliably stopped by the folded edge 6b and the circumferential protrusions 6a and 6a.

  It should be noted that at least one circumferential protrusion 6a may be provided, and the folded edge 6b may be slidably pressed against the outer peripheral surface of the small-diameter pipe.

  Further, the annular elastic waterstop 6 may be provided with a thin easily deformable portion 6 '' 'so that the annular elastic waterstop 6 can be easily deformed in the radial direction when the pipe body is bent.

  Further, a single stainless steel collar 7 is fitted over the outer circumferences of both the pipe main bodies 1 and 1 ′ and the outer circumference of the metal cylinder 5 to connect the two pipe main bodies 1 and 1 ′.

  In the collar 7, a plurality of small slits 8 are formed in a plurality of rows in a staggered position in a circumferential direction at a position facing between the extended end 5 ′ of the metal cylinder 5 and one step surface 3. The portion can be formed to be freely expandable / contractable with the bending of both the tube main bodies 1, 1 ′.

  The outer peripheral surface of one (right side) small-diameter pipe 4 and the inner peripheral surface of the base 6 'of the waterstop 6 are bonded and fixed with an adhesive 12, and the packing 9 is bonded to one (right side) opposite end 4a.

  The inner periphery of both ends of the collar 7 is fixed to both tube bodies 1, 1 'by anchor bars 13, 13', and the inner periphery of the base end of the metal cylinder 5 is the other (left side) tube body by anchor bars 14 '. The inner circumference of the short cylinder 5 ″ which is fixed to 1 ′ and covers the one (right side) tube body 1 is also fixed to the one (right side) tube body 1 by the anchor bars 14.

  The opposing disks 4e and 4f covering the opposing ends 4a and 4b are fixed to the small diameter tubes 4 and 4 'by anchor bars 15 and 15', respectively.

  As shown in FIG. 2, when the tube body is bent, the annular elastic waterstop 6 slides in the annular space s on the tube expansion side (the upper side in the figure), so that the annular elastic waterstop 6 and the metal cylinder 5 The pressure contact between the inner peripheral surface and the small-diameter pipe 4 'is maintained and the sealed state is maintained. Further, since the annular elastic waterstop 6 slides with respect to the bending of the pipe body, the deformation of the annular elastic waterstop 6 is small and the life can be improved.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In FIG. 1 (a), reference numeral 16 denotes an air vent, 18 in FIG. 4 (a), 18 denotes a joint cushioning material in the cited reference 1 (Japanese Utility Model Publication No. 4-10468), 19 denotes a flexible cylinder, 20 Is a steel plate ring.

  In underground propulsion pipe construction and buried pipe construction, joints should be flexibly adapted to shear, compression, and tension applied to the above pipes due to ground pressure fluctuations, groundwater fluctuations, geological changes, etc., and used without damage. Can do.

It is a vertical side view which shows the flexible joint for pipes of this invention. It is a vertical side view of the operation state of the joint. (A) The figure is a perspective view of the operation state of the joint part, and (B) is a partially enlarged view of (A). (A) and (B) are partial longitudinal side views of a conventional flexible joint for pipes.

Explanation of symbols

1, 1 'equal diameter pipe body 2 joint part 3, 3' stepped surface 3a, 3b metal disk 4, 4 'small diameter pipe 4c, 4d metal small diameter cylinder 4e, 4f metal counter disk 5 metal cylinder 5' extension end T communication gap s annular space 6 annular elastic waterstop 6 'base end 6 "main body 6''' deformable part 6a circumferential ridge 6b folding edge 7 collar 8 small slit

Claims (4)

In the joint part of the equal diameter pipe body,
A small-diameter pipe is formed in the opposite direction with the stepped surface as the boundary at the end of the isometric pipe
Extending the metal cylinder located in the outer circumferential direction of the small-diameter pipe of the other equal-diameter pipe body toward the outer periphery of the step surface of the one equal-diameter pipe body,
An annular elastic waterstop made of a rubber-like elastic body is accommodated in the outer space of both small-diameter pipes and the annular space surrounded by the metal cylinder and both step surfaces,
Fixing the base end of the waterstop to the outer peripheral surface of one small diameter pipe,
A flexible joint for pipes, wherein the body portion of the waterstop is slidably pressed against the inner peripheral surface of the metal cylinder and the outer peripheral surface of the other or both small-diameter pipes. A collar is fitted over the outer circumference of both the pipe main bodies and the outer circumference of the metal cylinder, and the collar is positioned between the extended end of the metal cylinder and the step surface of one of the equal-diameter pipe main bodies. In the circumferential direction, a plurality of small slits are formed in a plurality of rows at a staggered position,
The flexible joint for pipes according to claim 1, wherein the small slit portion is formed so as to be freely expandable and contractible. The inner circumference of the metal disk covering each of the two step surfaces and the metal small diameter cylinder covering the outer circumferences of both small diameter pipes are welded together, and the outer circumference of one metal disk and the outer circumference of one of the above tube bodies Welding a metal cylinder covering
3. The flexible joint for pipes according to claim 1 or 2, wherein an outer periphery of a metal facing disk covering the opposing surfaces of both small diameter pipes and a tip of each of the metal small diameter cylinders are welded.   At least one of the inner and outer peripheral surfaces of the annular elastic waterstop is provided with the metal cylinder and one or a plurality of circumferential ridges that press against the outer peripheral surface of the one or both small-diameter pipes. The flexible joint for pipes according to any one of claims 1 to 3 which formed the return edge which press-contacts to the peripheral face or the peripheral face of said small diameter pipe.

Images