JP6537865B2 - Repair method of telescopic flexible pipe joint and repair telescopic flexible pipe joint - Google Patents

Description

  The present invention relates to a repair method of a stretch flexible pipe joint and a repair stretch flexible pipe joint, a repair method of a stretch flexible pipe joint disposed in a conduit following a manhole having a diameter of a limited size, and The present invention relates to a repair telescopic flexible pipe joint.

  Various pipes such as a sewer pipe are buried underground to form a pipeline. It is necessary to connect pipings in order to form a long pipeline. In connection between the pipes, in order to maintain the connection performance even by an earthquake or the like, the flexible flexible joint 3 is used. In FIG. 8, the first flexible pipe 1 and the second pipe are provided so as to absorb expansion / contraction flexible joints 3 provided in the duct 21 connected to the manhole 20 even when relative expansion / contraction or twisting occurs. Connect with 2.

  On the other hand, the seal ring member 5 and the like may deteriorate over time due to years of use and the like of the expansion and contraction flexible pipe joint 3 and leakage may occur. In this case, it is conceivable to dig back earth and sand from the underground and replace the telescopic flexible pipe joint 3. However, if there are buildings etc. on the ground above the telescopic flexible pipe joint 3, it is difficult to dig up the earth and sand. is there.

  Therefore, the existing expansion flexible pipe joint 3 which has failed is repaired as it is disposed, and the rubber ring sheet is applied from the inside of the sleeve 4 of the existing expansion flexible pipe joint 3 to close it, and leakage does not occur. As it is done repairing.

  When the rubber ring sheet 6 is applied from the inside of the sleeve 4 of the existing telescopic flexible pipe joint 3, when the inside of the pipe becomes high pressure and the internal pressure acts, the rubber ring sheet 6 is the sleeve 4 of the telescopic flexible pipe joint 3 It can happen to be attached to Then, the first pipe 1 and the second pipe 2 can not be extended and retracted in and out of the sleeve 4 of the expandable flexible pipe joint 3 due to being disturbed by the rubber ring sheet 6 attached to the sleeve, and the elastic flexibility It becomes impossible to fulfill the function of the fitting 3.

  Therefore, in order to prevent the rubber ring sheet 6 from being attached to the sleeve 4 of the existing expansion flexible pipe joint 3 by the internal pressure, the core along the peripheral wall of the sleeve 4 between the sleeve 4 and the rubber ring sheet The ring member 7 is disposed. The rubber ring sheet 6 adheres to the inside of the coring member 7 when receiving an internal pressure, and a clearance space 8 is formed between the outside of the coring member 7 and the inside of the sleeve 4. The presence of the gap space 8 enables the first pipe 1 and the second pipe 2 to extend and retract in and out of the sleeve 4 of the expandable flexible connection 3.

  Since the coring member 7 is disposed along the peripheral wall between the sleeve 4 and the rubber ring sheet 6, the coring member 7 has the same diameter as the first pipe 1, the second pipe, and the sleeve 4.

  By the way, there are cases where the size d1 of the hole diameter of the manhole 20 is only a limited size. In this case, when the diameter d2 of the coring member 7 is larger than the diameter d1 of the hole diameter of the manhole 20, the coring member 7 can not be carried into the existing flexible flexible pipe joint 3. For this reason, since the coring member 7 can not be disposed along the peripheral wall between the sleeve 4 and the rubber ring sheet 6, there is a problem that the existing flexible flexible pipe joint 3 can not be repaired. there were.

JP 2008-625767 A

  Therefore, the present invention solves the above-mentioned problems of the prior art, and it is possible to lay the coring member even if the size of the manhole hole diameter is limited. A method of repairing a pipe joint and a repair telescopic flexible pipe joint are provided.

  In order to solve the above-mentioned subject, the repair method of the elastic flexible tube joint concerning the present invention is the method of repairing the elastic flexible tube joint provided in the pipeline which leads to the manhole which has the 1st diameter, Forming a clearance space between the first duct and the second duct connected by the telescopic flexible pipe joint so as to be telescopically moveable relative to the sleeve of the telescopic flexible pipe joint; A coring member having a second diameter larger than the first diameter is constituted by a plurality of coring unit members in a round shape, and the coring unit member is crushed into a flat circular shape and returned to a circular shape after being carried in from the manhole The coring member formed by attaching the coring unit member to the inner wall of the sleeve such that the coring member is formed by a plurality of the coring unit members Wherein the laying rubber ring sheet to prevent leakage of fluid substance from the inside.

  Further, the coring unit member crushed into a flat circular shape is returned to a circular shape at the bottom of the manhole, and the pipe line is rolled and carried to the position of the sleeve.

  Further, the coring unit member crushed into a flat circular shape is characterized by being stretched by applying an expander for stretching the coring unit member to both ends inside the coring unit member.

  The coring unit member may be returned to a circular shape by elastic deformation after being excessively stretched by the stretcher.

Further, a repairable elastic flexible pipe joint according to the present invention is a repairable elastic flexible pipe joint formed by repairing an existing elastic flexible pipe joint provided in a pipeline connected to a manhole having a first diameter, The existing telescopic flexible pipe joint connecting the first pipe line and the second pipe line,
More than the first diameter for forming a clearance space between the first pipe line and the second pipe line so that the first pipe line and the second pipe line can move telescopically with respect to the sleeve of the existing telescopic flexible pipe joint. A coring member having a large second diameter, and a rubber ring sheet installed on the coring member from the inside to prevent leakage of the fluid, the coring member includes a plurality of coring-shaped coring units The core ring unit member is squeezed into a flat circular shape, and after being carried in from the manhole, is returned to a circular shape, and the core ring member is formed by a plurality of the core ring unit members. It is characterized in that it is attached to the inner wall of the sleeve.

  According to the configuration of the present invention, since the coring member is constituted by a plurality of coring unit members in a round shape, the coring unit member is elastically deformed into a flat circular shape and carried in from a manhole having a hole diameter which is limited. It becomes possible to arrange a coring member having a diameter larger than the diameter of the manhole in the existing expansion / contraction flexible pipe joint by a plurality of coring unit members, and the sleeve and the coring member A clearance space is formed between the first and second ducts so that the first duct and the second duct can move telescopically with respect to the sleeve, and the rubber ring sheet can be used to repair the existing telescopic flexible pipe joint .

FIG. 8 is a partial cross-sectional view showing the configuration of the repaired flexible flexible tube joint. The figure which shows the end surface seen from A and B in FIG. FIG. 5 is a partial cross-sectional view as viewed from C-C ′ in FIG. 2; The figure which put together and was seen from B-B 'in FIG. 5, and A-A' of FIG. The figure which shows performing operation which enlarges a curvature by a stretcher for a coring unit member. The figure which shows performing operation which makes a flat circular coring unit member (b) extend | stretch by an expander, and makes it a circular coring unit member (c) through coring unit members (d) and (e). . The figure which shows the expansion-contraction flexible pipe joint which repaired the existing expansion-contraction flexible pipe joint arrange | positioned by the pipeline following a manhole. The figure which shows that pipings are connected by the expansion-contraction flexible pipe joint arrange | positioned by the pipeline following a manhole.

  Hereinafter, with reference to the drawings, embodiments of a repair method and a repair expandable flexible tube joint according to the present invention will be described.

  FIG. 1 is a plan view showing a repair expandable flexible tube joint, FIG. 2 is a view showing an end face seen from A and B in FIG. 1, and FIG. 3 is a cross-sectional view seen from C-C 'in FIG.

  The existing telescopic flexible pipe joint comprises a sleeve 4 and seal rings 5 disposed at both ends of the sleeve 4. The first pipe 1 and the second pipe 2 are held at both ends of the sleeve 4 so as to be capable of extending and contracting and bending in the axial direction via the seal ring member 5. In addition, as an arrangement method of the seal ring member 5, it is also possible to provide a member separate from the sleeve 4 and to arrange the member.

  It is assumed that the sealing performance is insufficient between the first pipe 1 or the second pipe 2 and the seal ring member 5 due to an impact such as an earthquake, aging, etc., and a leak of fluid flowing inside partially occurs. This leak is a small amount or non-fatal, and adopts a policy of repairing the existing expansion flexible pipe joint and closing the leak and utilizing it as a repair expansion flexible pipe joint .

  In the repair expandable flexible joint, a coring member 7 made of a rigid material such as a cylindrical metal material is disposed on the inner side of the sleeve 4 substantially coaxially with the sleeve 4. The coring member 7 is not limited to a metal but may be a resin as long as the coring unit member 9 constituting the coring member 7 has appropriate elastic deformation as described later.

  In order to arrange the coring member 7 substantially coaxially with the axial center of the sleeve 4, a center adjustment member made of a rubber material in a region of an angle range of about 45 degrees of the lower inner surface of the sleeve 4 18 is placed to adjust the position of the coring member 7 relative to the sleeve 4. The center adjustment member 18 is laid on the bottom of the coring member 7 while laminating a plurality of layers of unit thickness.

  On the inside of the coring member 7, a rubber ring sheet 6 is laid to prevent the leakage of the fluid flowing inside.

  The rubber ring sheet 6 receives the pressure of the fluid flowing inside, the inside of the rubber ring sheet 6 is in an internal pressure state, and the rubber ring sheet 6 receives a force in a direction to be pressed toward the inner wall surface of the sleeve 4. If the coring member 7 is not provided, the rubber ring sheet 6 is pressed against the inner wall surface of the sleeve 4, and the rubber ring sheet 6 pressed against the inner wall surface of the sleeve 4 makes the first pipe 1 or the second pipe 2 However, it is impossible to extend and contract in the axial direction via the seal ring member 5. In order to prevent such a situation, a coring member 7 is provided, and a clearance space 8 is formed between the first conduit 1 and the second conduit 2 so that the first conduit 2 and the second conduit 2 can move telescopically with respect to the sleeve 4. It forms. A clearance space 8 is formed between the outer side surface of each end of the coring member 7 and the inner side surface of each end of the sleeve 4, and each of the first conduit 1 and the second conduit 2 The end is located in the gap space 8.

  A thick portion 6a is formed at both ends of the rubber ring sheet 6, and the outer surface of the thick portion 6a movably seals the inner surfaces of the first pipe 1 and the second pipe 2 so as to be movable. Prevents the fluid inside from leaking. Both ends of the coring member 7 are held in contact with the axial end of the thick portion 6a.

Next, the configuration of the coring member 7 will be described.
Since the size d1 of the hole diameter of the manhole 20 is only limited and the diameter d2 of the coring member 7 is larger than the diameter d1 of the hole diameter of the manhole 20, the coring member 7 is integrated. If it is as it is, it can not carry into the existing expansion-contraction flexible fitting 3. Therefore, the coring member 7 is constituted by a plurality of coring unit members 9 formed in a round shape. The coring unit member 9 has a diameter equal to the diameter d2 of the coring member 7 after assembly. The coring unit member 9 can be carried in from the manhole 20 by being elastically deformed into a flat circular shape or an elliptical shape, and then it is reassembled into a circular shape.

  In FIGS. 1, 2 and 3, using a plurality of coring unit members 9 elastically deformed into a flat circular shape and carried in from the manhole 20 and then returned to a circular shape at a position directly below the manhole 20. , The assembled coring member 7 is shown.

  Mounting members 14 are horizontally mounted on two opposing inner walls in a horizontal position passing through the center of the sleeve 4. The plurality of coring unit members 9 are arranged to form a cylinder and attached and fixed to two opposing mounting members 14. The plurality of coring unit members 9 attached to the attaching member 14 are fixed from the inside by the horizontal restraining member 11 disposed in the horizontal direction and the circumferential restraining member 13 disposed in the circumferential direction so as to be integrated. The coring member 7 is formed.

  Screw holes are formed at predetermined intervals on the inside of the formed coring member 7, and the seal ring member 5 made of a rubber material is screwed to the inside of the coring member 7 using the screw holes. Be done.

Next, carrying in the coring unit member 9 from the manhole 20 into the pipeline 21 will be described with reference to FIGS. 4 to 7.
As shown in FIG. 7, the coring unit member 9 (a) shipped from the factory is elastically deformed in a flat circle to be flatter than the hole diameter d1 of the manhole 20, and is bound in a flat circle by a string or the like. It is maintained, and in this vertically elongated state, it is lowered and carried into the manhole 20 of the hole diameter d1.

  Next, the coring unit member 9 (a) carried in from the manhole 20 is rotated by 90 degrees in the bottom area of the manhole 20 and becomes a horizontally long coring unit member 9 (b) in the conduit 21. In this state, the strings at the time of shipment from the factory are released.

  Next, the stretcher 25 is brought into contact with the upper and lower ends of the coring unit member 9 (b) in the minor axis direction to extend the coring unit member 9 (b) in the vertical direction. Here, when the coring unit member 9 (b) is extended in the vertical direction, the upper space of the manhole 20 is utilized as well and it is intended as shown as the coring unit member 9 (e) in FIG. It is extended excessively in the longitudinal direction, and is finally shaped into a circular shape by elastic deformation to become the coring unit member 9 (c).

  The circularly shaped coring unit member 9 (c) is rolled in the duct 21 and carried to the existing telescopic flexible pipe joint in the duct 21 where it is assembled as described above.

  FIG. 4 shows the expander 25 which combines the view from B-B 'of FIG. 5 with the view from A-A' of FIG. The expander 25 is constituted by a hydraulic cylinder and has contact parts 25a and 25b at both ends. The contact portions 25a and 25b are brought into contact with the inside of the coring unit member 9 to perform an extension operation. FIG. 5 is a view showing an operation of enlarging the curvature of the coring unit member 9, and abuts the contact portions 25a and 25b of the expander 25 to the upper and lower portions of the coring unit member 9 to drive the hydraulic cylinder. Then, the coring unit member 9 is slightly elongated in the longitudinal direction and excessively extended, and is reduced by elastic deformation and then returned, so that the coring unit member 9 becomes circular.

  FIG. 6 is a view showing a procedure for deforming the coring unit member 9 (b) shown in FIG. 7 into a circular coring unit member 9 (f) using the expander 25. The contact portions 25a and 25b of the expander 25 are in contact with the upper and lower portions of the coring unit member 9 (b), and the hydraulic cylinder is driven to extend to the coring unit member 9 (d). It is extended to (e) and made excessively long, and then the stretcher 25 is removed, and is elastically returned from the coring unit member 9 (e) to the circular coring unit member 9 (c) by elastic deformation. As described above, the circular coring unit member 9 (c) is rolled and moved in the conduit 21.

  As described above, according to the present embodiment, the coring member 7 is constituted by a plurality of coring unit members 9 formed in a round shape, the coring unit member 9 is elastically deformed into a flat circular shape, and a manhole is bound by a cord or the like. The core ring unit member 9 can be returned to a circular shape by using the expander 25 after being carried into the manhole 20, and can be moved in a rolling manner within the conduit 21, so that the hole of the core ring member 7 can be carried. Although the diameter d2 is larger than the hole diameter d1 of the manhole 20, the plurality of coring unit members 9 are brought into the existing telescopic flexible pipe joint 3 to assemble the coring member 7 into the existing telescopic flexible pipe joint 3 It can be arranged. As a result, the gap space 8 can be formed between the inner wall surface of the sleeve 4 and the outer wall surface of the coring member 7, and the rubber ring sheet 6 is stuck to the sleeve 4 by the internal pressure due to the presence of the gap space 8. Instead, the first conduit 1 and the second conduit 2 can be moved telescopically with respect to the sleeve 4.

  In the above description, the term manhole 20 refers not to a narrowly defined manhole but to a broad manhole, and is not limited to a so-called manhole provided on a road, but a flexible flexible tube joint embedded underground or the like Any hole may be used as long as the material or the like is carried into the hole leading to the hole, and not only the vertical hole but also an inclined hole may be used.

DESCRIPTION OF SYMBOLS 1 1st piping 2 2nd piping 3 expansion-contraction flexible tube coupling 4 sleeve 5 seal member 6 rubber ring sheet 7 coring member 8 clearance space 9, 9 (a)-9 (e) coring unit member 11 side restraining member 13 Circumferential restraint member 14 Mounting member 20 Manhole 21 Duct 25 Stretcher d1 Manhole hole diameter d2 Coring member diameter

Claims (5)

A method of repairing a telescopic flexible pipe joint provided in a pipe line connected to a manhole having a first diameter, comprising:
A clearance space is formed between the first duct and the second duct connected by the telescopic flexible pipe joint so as to be telescopically moveable with respect to the sleeve of the telescopic flexible pipe joint A coring member having a second diameter larger than the first diameter is constituted by a plurality of coring unit members in a round shape,
After the coring unit member is elastically deformed in an elliptical shape and carried in from the manhole , the minor axis direction of the elliptical coring unit member is extended by a stretcher to return to a circular shape, and a plurality of the coring units Attaching the coring unit member to the inner wall of the sleeve such that the coring member is formed by the member;
A repair method of a flexible flexible pipe joint characterized by laying a rubber ring sheet for preventing the leakage of fluid from the inside of the formed core ring member. The telescopic unit according to claim 1, wherein the coring unit member crushed into a flat circular shape is returned to a circular shape at the bottom of the manhole, rolled in the pipeline and carried to the position of the sleeve. Repair method of flexible pipe joint. The coring unit member crushed into a flat circular shape is extended by applying an expander for extending the coring unit member to both ends inside the coring unit member. The repair method of the expansion-contraction flexible pipe joint as described in 4. The method according to claim 3, wherein the coring unit member is returned to a circular shape by elastic deformation after being excessively stretched by the stretcher. A repair telescopic flexible pipe joint for repairing and forming an existing telescopic flexible pipe joint provided in a pipe line connected to a manhole having a first diameter, comprising:
The existing telescopic flexible pipe joint connecting the first pipe line and the second pipe line,
More than the first diameter for forming a clearance space between the first pipe line and the second pipe line so that the first pipe line and the second pipe line can move telescopically with respect to the sleeve of the existing telescopic flexible pipe joint. A coring member having a large second diameter;
And a rubber ring sheet laid from the inside to the core ring member to prevent leakage of fluid.
The coring member is composed of a plurality of coring unit members in a round shape,
The coring unit member is elastically deformed into an elliptical shape and carried in from the manhole, and then returned to a circular shape by extending the minor axis direction of the elliptical coring unit member with a stretcher , A repair telescopic flexible pipe joint characterized in that it is attached to the inner wall of the sleeve so that the coring member is formed by the coring unit member.

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