JP6242681B2 - Leakage repair device and method of mounting the leak repair device - Google Patents

Description

  The present invention relates to a leakage repair device that repairs a leakage portion of a fluid pipe to prevent leakage of a fluid, and a mounting method of the leakage repair device.

  Conventionally, in the case of existing fluid pipes such as water pipes, when fluid leaks due to various reasons such as poor bonding or cracks, the leakage point is repaired by a leak repair device equipped with a cylindrical case body. ing. A sealed space is formed inside the case body that is externally fitted to the fluid pipe, and leakage of fluid to the outside can be prevented by retaining the fluid in the sealed space. As disclosed in Patent Literatures 1 and 2, the case body includes a plurality of divided pieces that have divided portions at a plurality of locations in the circumferential direction and are connected via fasteners.

  In the apparatus described in Patent Document 1, since the sealed space faces the inner peripheral surface of the case body, the leaked fluid contacts the inner peripheral surface of the case body. Therefore, in a situation where the fluid is ejected vigorously, there is a concern that the packing is pushed out and pops out at the moment when the divided portion of the case body is closed. On the other hand, in the apparatus described in FIGS. 1 to 5 of Patent Document 2, the band-shaped body provided on the packing partitions the sealed space in the radial direction, and the fluid is retained in the inner circumferential space of the band-shaped body. Therefore, the fluid is not in contact with the inner peripheral surface of the case body.

  However, in the above-described device described in Patent Document 2, the space on the inner peripheral side of the belt-like body is partitioned in the circumferential direction in the division part of the case body, so that the pressure of the leaked fluid faces the leakage location Only works on other packings, not on other packings. Therefore, in a situation where the fluid is ejected vigorously, pressure concentrates on the packing facing the leaked part, which may cause deterioration in workability and cause the packing to be displaced. It was.

Japanese Patent Laid-Open No. 10-73190 Japanese Patent Publication No. 3-37676

  The present invention has been made in view of the above circumstances, and its purpose is to prevent a pressure from concentrating and acting on the packing facing the leaked portion, and to ensure the workability and stability of the packing. And it is providing the mounting method of the leak repair apparatus.

  The above object can be achieved by the present invention as described below. That is, the leakage repair device according to the present invention includes a cylindrical case body that has a split portion at a plurality of locations in the circumferential direction and is externally fitted to a fluid pipe, and the case body is tightened by tightening the split portion. In a leak repair apparatus comprising a fastener for connecting a plurality of divided pieces to be configured and a packing attached to each of the divided pieces, the packing is disposed at each of axial end portions of the divided pieces, and A pair of arc portions that are in contact with the outer peripheral surface of the fluid pipe and a circumferential end of each of the divided pieces are sealed to seal the gap between the divided portions, and the ends of the pair of arc portions are connected to each other. A pair of connecting portions that form a loop, and a membrane portion that extends along the outer peripheral surface of the fluid pipe over the entire area of the loop and is disposed with a gap with respect to the outer peripheral surface of the fluid pipe. The gap communicates between the divided pieces, thereby In which sealed annular space along the direction is formed around the fluid tube.

  In such a leakage repair device, since the packing attached to the divided piece includes the film portion as described above, the fluid retained in the sealed space does not contact the inner peripheral surface of the case body. Moreover, since the sealed space is formed in an annular shape around the fluid pipe, the leaked fluid spreads all around the fluid pipe so that the equalized pressure is applied to each packing. It acts and pressure does not concentrate on the packing that faces the leak location. Thereby, when repairing the leak location of a fluid pipe, workability and stability of packing can be secured.

The packing, the state in contact said membrane portion on the inner peripheral surface of the split piece Ru is attached to the divided piece. According to such a configuration, since the displacement of the membrane portion due to the pressure of the leaked fluid is suppressed, and thus the packing is less likely to be displaced, the stability of the packing is sufficiently ensured and the leakage preventing effect is improved. Can do.

  It is preferable that a protrusion adjacent to the connecting portion from the sealed space side is formed at the circumferential end of the divided piece. According to such a configuration, the displacement of the connecting portion due to the pressure of the leaked fluid is suppressed in the divided portion of the case body, and thus the packing is less likely to be displaced. The leakage prevention effect can be improved.

  It is preferable that a protrusion adjacent to the arc portion from the sealed space side is formed at the axial end of the divided piece. According to such a configuration, the displacement of the arc portion due to the pressure of the leaked fluid is suppressed, and consequently the packing is less likely to be displaced, so that the stability of the packing is ensured and the leakage prevention effect is improved. Can do.

  An insertion hole for inserting the fastener is formed in the divided portion, a pair of flange surfaces that protrude radially outward from the circumferential end portion of the divided piece are provided, and the insertion hole is It is preferable to form a long hole shape along the protruding direction of the flange surface, and to form a truncated cone shape having a smaller diameter as the distance from the flange surface increases. According to such a configuration, the split piece can be inclined so that the pair of flange surfaces approach each other in the split portion in which the fastener is inserted into the insertion hole. For this reason, when the divided portion in which the fastener is not inserted into the insertion hole is opened, the divided pieces are not displaced from each other, and the workability can be effectively improved.

  In the above, it is preferable that a pair of inclined surfaces extending in a direction away from each other toward the radially outer side is formed on the distal end side of the pair of flange surfaces facing each other. According to this configuration, when the fluid pipe is inserted into the case body through the opening formed by opening the other divided portions as a temporarily assembled state in which some of the divided portions are loosely tightened with the fasteners, the other divided portions are Easy to open and improve workability.

  Further, the leakage repair device mounting method according to the present invention uses the above-described leakage repair device, and opens the other divided portions in a temporarily assembled state in which some of the divided portions are loosely tightened with the fasteners. A fluid pipe is inserted into the case body through the opening formed, and each of the divided portions of the case body surrounding the leakage portion of the fluid pipe is firmly tightened with the fastener, and a pair of outer peripheral surfaces of the fluid pipe is provided. The arcuate part is brought into contact and the split part is sealed by a pair of the connecting parts to form the sealed space around the fluid pipe. According to such a method, it is possible to prevent the pressure from acting on the packing facing the leaked portion as described above, and to secure the workability and the stability of the packing.

The top view which shows an example of the leak repair apparatus which concerns on this invention Front view of the leakage repair device of FIG. Bottom view of the leakage repair device of FIG. Left side view of the leakage repair device of FIG. AA arrow sectional view of FIG. BB arrow sectional view of FIG. (A) Plan view and (B) CC arrow sectional view of the segment (A) Plan view, (B) Side view, (C) DD arrow sectional view, and (D) EE arrow sectional view of packing Schematic showing an example of the installation procedure of the leak repair device

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As an example of the leak repair apparatus according to the present invention, the leak repair apparatus 1 shown in FIGS. 1 to 4 do not show a rear view and a right side view of the leakage repair device 1, but are the same as the front view (FIG. 2) and the left side view (FIG. 4), respectively. 5 shows a cross section taken along the line AA in FIG. 1, and FIG. 6 shows a cross section taken along the line BB in FIG. In the present embodiment, an example of repairing a leakage portion of an existing water pipe P (an example of a fluid pipe) using the leakage repair apparatus 1 will be described.

  The leakage repair device 1 includes a cylindrical case body 2, a fastener 3, and a packing 4. The case body 2 has division parts 20 at a plurality of locations in the circumferential direction (two locations in the present embodiment) and is externally fitted to the water pipe P, and is formed of a metal material such as ductile cast iron, for example. The fastener 3 connects the plurality of (two in the present embodiment) divided pieces 21 and 22 constituting the case body 2 by tightening the divided portion 20. The divided piece 21 is a circular plate member having a central angle of about 180 degrees as shown in FIG. Since the shape of the divided piece 22 is the same as this, a reference numeral is put in parentheses.

  The packing 4 is attached to each of the divided pieces 21 and 22, and includes a pair of arc portions 41, a pair of connecting portions 42, and a film portion 43 as shown in FIG. 8. A pair of circular arc part 41 is arrange | positioned at each of the axial direction edge part of the division pieces 21 and 22, and contacts the outer peripheral surface of the water pipe P like FIG. That is, the gap between the axial end of the case body 2 and the outer peripheral surface of the water pipe P is sealed by the arc portion 41. The arc portion 41 is curved in an arc shape along the circumferential direction, and is fitted into the groove 23 formed at the end portion in the axial direction of the divided pieces 21 and 22.

  The pair of connecting portions 42 is disposed at each of the circumferential end portions of the split pieces 21 and 22 to seal the gap between the split portions 20. As shown in FIG. 6, the connecting portion 42 is fitted into the groove 24 formed at the circumferential end of the split pieces 21 and 22, and they are brought into close contact with each other as the fastener 3 is tightened, whereby the split portion 20. The gap is sealed. In the present embodiment, the connecting portion 42 having a rectangular cross section is formed linearly along the axial direction. Further, the pair of connecting portions 42 connects the ends of the pair of arc portions 41 to form a loop. As shown in FIG. 8A, this loop has a rectangular shape in plan view.

  The split part 20 is provided with a pair of flange surfaces 21 a and 22 a that protrude radially outward from the circumferential ends of the split pieces 21 and 22 and face each other. The flange surfaces 21a and 22a are formed with insertion holes 25 through which the fasteners 3 each consisting of a T-head bolt 31 and a nut 32 are inserted. A plurality of connected divided pieces 21 and 22 constitute a cylindrical case body 2 by fastening the dividing portion 20 with the fastener 3, and the connecting portion 42 sandwiched between the flange surfaces 21 a and 22 a is the divided portion. 20 gaps are sealed.

  The film part 43 extends along the outer peripheral surface of the water pipe P in the entire region in the loop formed by the arc part 41 and the connecting part 42. As shown in FIGS. 8C and 8D, the film portion 43 extends along the connecting portion 42 while being curved along the arc portion 41. Therefore, the packing 4 is formed in a semi-cylindrical shape as a whole. As shown in FIGS. 5 and 6, the membrane portion 43 is arranged so as not to contact the outer peripheral surface of the water pipe P and to provide a gap with respect to the outer peripheral surface of the water pipe P. The connecting portion 42 does not contact the outer peripheral surface of the water pipe P, and the packing 4 is separated from the outer peripheral surface of the water pipe P at the dividing portion 20.

  As shown in FIG. 6, the gap between the membrane portion 43 and the outer peripheral surface of the water pipe P communicates between the connected divided pieces 21, 22, whereby an annular sealed space S along the circumferential direction is provided as a water supply. It is formed around the tube P. When the leak location of the water pipe P is repaired with this device 1, the leaked water (an example of fluid) stays in the sealed space S, so that leakage of water to the outside can be prevented. The outer peripheral surface of the sealed space S is formed by the film portion 43, and the water retained in the sealed space S does not contact the inner peripheral surface of the case body 2.

  Thus, since the sealed space S is formed in an annular shape around the water pipe P, the leaked water spreads all around the water pipe P so as to surround it. As a result, the equalized water pressure acts on each packing 4, and the water pressure does not concentrate and act on the packing 4 facing the leaked portion. Therefore, even when a crack causing water leakage is formed on the lower side of the water pipe P in FIG. 6, the water pressure in the sealed space S also acts on the upper packing 4 attached to the divided piece 22, and the divided piece. The water pressure is not concentrated on the lower packing 4 attached to 21. Thereby, when repairing the leak location of the water pipe P, workability and stability of packing can be secured.

  As shown in FIGS. 5 and 6, the packing 4 is attached to the divided pieces 21 and 22 with the film portion 43 being in contact with the inner peripheral surfaces of the divided pieces 21 and 22. In the present embodiment, the outer diameter of the packing 4 in the natural state (the outer diameter of the film portion 43) is designed to be the same as or slightly larger than the inner diameter of the case body 2, and the split pieces 21, The film part 43 is in contact with the inner peripheral surface of 22. As a result, the displacement of the film portion 43 due to water pressure is suppressed, and consequently the packing 4 is less likely to be displaced, so that the stability of the packing 4 can be secured satisfactorily and the leakage prevention effect can be improved.

  As shown in FIGS. 6 and 7, projections 26 adjacent to the connecting portion 42 from the sealed space S side are formed at the circumferential ends of the divided pieces 21 and 22. Thereby, in the division part 20, since the displacement of the connection part 42 due to water pressure is suppressed, and the packing 4 is less likely to be displaced, the stability of the packing 4 can be ensured satisfactorily and the leakage prevention effect can be improved. As shown in FIG. 8C, the film portion 43 is bent so as to provide a recess 44 from the central portion in the thickness direction of the connecting portion 42, and the protrusion 26 is fitted into the recess 44.

  As shown in FIGS. 5 and 7, projections 27 adjacent to the arc portion 41 from the sealed space S side are formed at the axial ends of the divided pieces 21 and 22. Thereby, since the displacement of the circular arc part 41 due to water pressure is suppressed, and the packing 4 is less likely to be displaced, the stability of the packing 4 can be secured satisfactorily and the leakage preventing effect can be improved. As shown in FIG. 8D, the film portion 43 is bent so as to provide a recess 45 from the central portion in the thickness direction of the arc portion 41, and the protrusion 27 is fitted into the recess 45.

  As shown in FIG. 8D, the arc portion 41 has a shape in which a plurality of (two in this embodiment) mountain portions are provided on the surface that contacts the outer peripheral surface of the water pipe P. According to such a shape, it is convenient because the arc portion 41 is easily pressed against the outer peripheral surface of the water pipe P when the dividing portion 20 is tightened. In the arc portion 41, a similar peak portion is provided on the surface that contacts the bottom surface of the groove 23. On the other hand, as shown in FIG. 8C, the connecting portion 42 has a flat surface on which the connecting portions 42 abut each other, which is convenient for sealing the divided portion 20.

  The thickness t3 of the film portion 43 is, for example, several millimeters, and is set smaller than the thickness t1 of the arc portion 41 as shown in FIG. 8D, and the thickness t2 of the connecting portion 42 as shown in FIG. 8C. Is set smaller than. Thus, by forming the film part 43 thin, it is possible to secure the volume of the sealed space S while suppressing the volume and weight of the packing 4 from becoming larger than necessary.

  As shown in FIG. 7, the insertion hole 25 forms a truncated cone shape that becomes a long hole shape along the protruding direction of the flange surfaces 21 a and 22 a and becomes smaller in diameter as the distance from the flange surfaces 21 a and 22 a increases. The wall surface of the insertion hole 25 on the front end side of the flange surfaces 21a and 22a is inclined with respect to the axial direction of the fastener 3 during tightening (the left-right direction in FIG. 7B). In addition, a pair of inclined surfaces 28 extending in a direction away from each other toward the radially outer side are formed on the distal ends of the pair of flange surfaces 21a and 22a facing each other. These shapes are advantageous in construction as described later.

  When mounting such a leakage repair device 1 on the water pipe P, the divided pieces 21 and 22 are temporarily assembled in advance to cover the water pipe P in order to reduce the burden on the operator and shorten the construction time. It is desirable to install. Further, when the diameter of the water pipe P is relatively large (for example, when the nominal diameter of the water pipe is φ500 or more), the divided pieces 21 and 22 become heavy objects. It is convenient to mount from above. A specific procedure will be described with reference to FIG.

  In FIG. 9 (A), the temporarily assembled leakage repair device 1 is lifted, and the upper ends of the wires 5 connected to the divided pieces 21 and 22 are connected to a crane (not shown). This device 1 is in a state where some of the divided portions 20 (the divided portions in the upper part of FIG. 9) are loosely tightened with the fastener 3, and the other divided portions 20 (the divided portions in the lower part of FIG. 9) are not tightened. 9 (A) and 9 (B) show a state in which the temporarily assembled leakage repair device 1 is lowered and the water pipe P is inserted into the case body 2 through an opening formed by opening another divided portion 20. Yes.

  At this time, in the divided portion 20 that is loosely tightened with the fastener 3, the pair of flange surfaces 21 a and 22 a are formed while the insertion hole 25 has the shape as described above and the fastener 3 is inserted into the insertion hole 25. The divided pieces 21 and 22 can be inclined so as to approach each other. Therefore, when the other divided part 20 is opened, the divided pieces 21 and 22 are not shifted from each other, and the workability can be effectively improved. Further, since the pair of inclined surfaces 28 are formed, the other divided portions 20 can be opened widely, and the postures of the divided pieces 21 and 22 are more stable if the inclined surfaces 28 are brought into contact with each other.

  In FIG. 9C, after the fastener 3 is attached to each of the divided portions 20 of the case body 2 that covers the water pipe P, the fastener 3 is temporarily tightened without being firmly tightened. When the device 1 is rotated 90 degrees and each of the divided portions 20 of the case body 2 surrounding the leaked portion of the water pipe P is firmly tightened with the fastener 3, the final tightening state shown in FIGS. . Thereby, while a pair of circular arc part 41 contacts the outer peripheral surface of the water pipe P, the division part 20 is sealed by a pair of connection part 42, and the sealed space S is formed around the water pipe P.

  The rotating operation of the device 1 as described above is not essential, and may be omitted if unnecessary. Moreover, it is not necessary to arrange | position the apparatus 1 in the leak location of the water pipe P until it tightens, after attaching the apparatus 1 to another location and performing until temporary fastening, the apparatus 1 is moved to an axial direction, It is also possible to perform the final tightening after the case body 2 is arranged so as to surround the leakage portion. According to such a method, since temporary tightening can be performed without being affected by the leaking fluid, the workability can be improved more favorably.

  The case body 2 of the present embodiment has the divided portions 20 at two locations in the circumferential direction, but has divided portions at three or more locations in the circumferential direction as long as it has a split structure that can be externally fitted to the fluid pipe. It doesn't matter. For example, in the case where the divided portions are provided at three locations in the circumferential direction, the case body is constituted by three divided pieces having an arc plate shape with a central angle of about 120 degrees, and the packing attached to them is also divided into divided pieces. A corresponding shape is formed, and an annular sealed space is formed inside the case body. Moreover, when attaching to a fluid pipe | tube, workability | operativity can be improved by carrying out the final fastening from the temporary assembly to temporary fastening similarly to the above.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. The shape and size of each member constituting the leakage repair device are appropriately determined. You can change it. In the above-described embodiment, a plurality of (specifically, four) fasteners are provided in each of the divided portions. However, the number of fasteners depends on the required strength in consideration of the use and size of the fluid pipe. It can be changed as appropriate. Further, the fluid pipe is not limited to a water pipe, and may be a fluid pipe used for fluids such as various liquids and gases other than water.

DESCRIPTION OF SYMBOLS 1 Leak repair apparatus 2 Case body 3 Fastener 4 Packing 20 Dividing part 21 Dividing piece 21a Flange surface 22 Dividing piece 21a Flange surface 25 Insertion hole 26 Protrusion 27 Protrusion 28 Inclined surface 41 Arc part 42 Connection part 43 Membrane part P Water pipe ( Example of fluid pipe)
S sealed space

Claims (6)

A cylindrical case body that has divided portions at a plurality of locations in the circumferential direction and is externally fitted to the fluid pipe, and a fastener that connects a plurality of divided pieces constituting the case body by tightening the divided portions. And a leakage repair device comprising a packing attached to each of the divided pieces,
The packing is disposed at each of the axial end portions of the divided pieces and contacts with the outer peripheral surface of the fluid pipe, and the divided portions are disposed at the circumferential end portions of the divided pieces. And a pair of connecting portions that form a loop by connecting the ends of the pair of arc portions, and spread along the outer peripheral surface of the fluid pipe in the entire area of the loop. A film portion disposed with a gap with respect to the outer peripheral surface,
The gap communicates between the connected divided pieces, whereby an annular sealed space along the circumferential direction is formed around the fluid pipe ,
The leakage repairing apparatus , wherein the packing is attached to the split piece in a state where the film portion is in contact with an inner peripheral surface of the split piece . The leakage repair device according to claim 1, wherein a protrusion adjacent to the connecting portion from the sealed space side is formed at an end portion in the circumferential direction of the divided piece. The leakage repair device according to claim 1 , wherein a protrusion adjacent to the arc portion from the sealed space side is formed at an axial end portion of the divided piece. An insertion hole for inserting the fastener is formed in the divided portion, and a pair of flange surfaces that protrude radially outward from the circumferential end of the divided piece and are opposed to each other are provided.
The leak repair according to any one of claims 1 to 3 , wherein the insertion hole forms a long hole shape along a protruding direction of the flange surface, and forms a truncated cone shape having a smaller diameter as the distance from the flange surface increases. apparatus. The leak repair apparatus according to claim 4 , wherein a pair of inclined surfaces extending in a direction away from each other toward the radially outer side are formed on the distal ends of the pair of flange surfaces facing each other. Use the leakage repair device according to any one of claims 1 to 5 ,
As a temporarily assembled state in which some of the divided portions are loosely tightened with the fasteners, a fluid pipe is inserted into the case body through an opening formed by opening the other divided portions,
Each of the divided portions of the case body that surrounds the leakage portion of the fluid pipe is firmly tightened with the fasteners, and a pair of the arc portions are brought into contact with the outer peripheral surface of the fluid pipe, and the pair of connecting portions A method for mounting a leakage repair device that seals a divided portion and forms the sealed space around the fluid pipe.

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