Water leakage repairing accessory and water leakage repairing method

Abstract

A water leakage repair fitting is provided with: a first unit (1) having a fastening mechanism (4) and a plurality of metal strips (3) provided at intervals in the pipe circumferential direction of a fluid pipe (K), the fastening mechanism (4) fastening the pipe circumferential direction ends of the plurality of metal strips (3) to each other; a second unit (2) which is disposed adjacent to the first unit, and which is provided with a fastening mechanism (4) and a plurality of metal straps (3), the plurality of metal straps (3) being provided at intervals in the pipe circumferential direction of the fluid pipe (K), the fastening mechanism (4) fastening the ends of the plurality of metal straps (3) in the pipe circumferential direction to each other; and a first water stop piece (6) which is formed of an elastic body and extends from a first metal band (3 ') included in the first unit to a second metal band (3' ') included in the second unit in the axial direction (AD) of the tube. The length (L2) of the first water stop piece (6) in the pipe circumferential direction is smaller than the lengths of the first metal band (3 ') and the second metal band (3' ') in the pipe circumferential direction, and the first water stop piece (6) is pressed against the outer circumferential surface of the fluid pipe (K) by the first metal band (3') and the second metal band (3 '').

Description

Technical Field

[0001] This disclosure relates to leak repair technology for fluid pipelines such as tap water pipes. Background Technology

[0002] Fluid pipes installed outdoors, such as water pipe bridges (water pipes, etc.), sometimes leak due to corrosion. Devices for repairing fluid pipes in case of leakage are known (see Patent Document 1).

[0003] Patent Document 1 describes a leak repair accessory comprising a metal strip wound around the leaking part of a fluid pipe, a fastening mechanism for fastening the metal strip, and a rubber sheet disposed on the inner circumference of the metal strip.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2023-013633 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] While the leak repair fitting disclosed in Patent Document 1 is suitable for repairing leaks such as pinholes, it is sometimes difficult to deal with leaks caused by cracks extending along the pipe axis.

[0009] This disclosure provides a leak repair technique capable of addressing leaks caused by cracks extending along the pipe axis.

[0010] means for solving problems

[0011] The present invention relates to a leak repair fitting, which is installed on a leaking part of a fluid pipeline. The leak repair fitting comprises: a first unit having a fastening mechanism and a plurality of metal strips, the plurality of metal strips being spaced apart along the circumferential direction of the fluid pipeline, the fastening mechanism fastening the circumferential ends of the plurality of metal strips to each other; a second unit having a fastening mechanism and a plurality of metal strips, the plurality of metal strips being spaced apart along the circumferential direction of the fluid pipeline, the fastening mechanism fastening the circumferential ends of the plurality of metal strips to each other, the second unit being adjacent to the first unit; and a first water-stopping plate formed of an elastomer, extending along the pipe axis from the first metal strip included in the first unit to the second metal strip included in the second unit, the circumferential length of the first water-stopping plate being less than the circumferential lengths of the first and second metal strips, the first water-stopping plate being pressed against the outer circumferential surface of the fluid pipeline by the first and second metal strips. Attached Figure Description

[0012] Figure 1 This is a side view showing a leak repair fitting installed on a fluid pipeline according to the first embodiment.

[0013] Figure 2 yes Figure 1 Sectional view of part II-II.

[0014] Figure 3 This is a side view showing the metal strip installed in front of the fluid pipeline and the second waterstop integrated with the metal strip.

[0015] Figure 4 This is a top view showing the metal strip.

[0016] Figure 5 This is a side view showing the metal strip.

[0017] Figure 6 This is a diagram of the second waterstop plate as viewed from the inner circumferential side (inside the pipe diameter direction).

[0018] Figure 7 yes Figure 6 Cross-sectional view of the VV section.

[0019] Figure 8 This is a diagram of the first waterstop plate as viewed from the inner circumferential side (inside the pipe diameter direction).

[0020] Figure 9 yes Figure 8 Cross-sectional view of section IX-IX.

[0021] Figure 10 yes Figure 8 Cross-sectional view of part XX in the middle.

[0022] Figure 11 This is a diagram showing the steps involved in a leak repair method using leak repair accessories.

[0023] Figure 12 This is a diagram showing the steps involved in a leak repair method using leak repair parts.

[0024] Figure 13 yes Figure 1 A sectional view of the XII-XII section.

[0025] Figure 14 This refers to the first water-stop sheet in the second embodiment. Figure 9 The corresponding diagram.

[0026] Figure 15 This is a cross-sectional view showing the first and second waterstops along the pipe axis and pipe diameter.

[0027] Figure 16 yes Figure 15Cross-sectional view of the XVI-XVI section.

[0028] Figure 17 It is a top view showing the first waterstop and the first metal plate bonded to the outer periphery of the first waterstop, viewed along a line of sight parallel to the pipe diameter.

[0029] Figure 18 yes Figure 17 Cross-sectional view of the XVIII-XVIII section. Detailed Implementation

[0030] <First Implementation Method>

[0031] Hereinafter, the leak repair accessory and leak repair method of the first embodiment of the present invention will be described with reference to the accompanying drawings.

[0032] like Figure 1 and Figure 2 As shown, a leak repair fitting is installed on the leaking part K1 of a fluid pipe K, such as a water pipe. The leak repair fitting of the first embodiment stops the leak in the leaking part K1 caused by a crack extending along the pipe axis AD of the fluid pipe K. Such cracks sometimes appear at welded parts extending along the pipe axis AD of the fluid pipe K. The leak repair fitting includes a first unit 1, a second unit 2 disposed adjacent to the first unit 1, and a first water-stopping plate 6 for stopping the leak in the leaking part K1. The first unit 1 has a plurality of metal strips 3, a fastening mechanism 4, and a second water-stopping plate 5. The second unit 2 has a plurality of metal strips 3, a fastening mechanism 4, and a second water-stopping plate 5. Although the first unit 1 and the second unit 2 are positioned differently relative to the fluid pipe K, the structures of the metal strips 3, the fastening mechanism 4, and the second water-stopping plate 5 constituting each unit are the same.

[0033] The term "accessory" in the context of leak repair fittings is intended to indicate that a plurality of metal strips are made of metal, and does not imply that other components, such as waterstops, are made of metal.

[0034] <Metal Strip 3>

[0035] A plurality of metal strips 3 are arranged at intervals along the circumferential direction CD of the fluid conduit K. For example... Figure 3 , Figure 4 and Figure 5 As shown, the metal strip 3 has annular portions 30 at both ends in the circumferential direction CD. The annular portions 30 are formed by bending a metal plate and welding the top ends 31 of the metal plate located on both sides in the circumferential direction CD to the metal plate. Figure 3 , Figure 4 and Figure 5In the illustrated embodiment, the metal strip 3 is positioned with the welded tip 31 of the metal plate positioned inside the pipe diameter direction RD2. When the metal plate is bent to form a ring-shaped portion 30, the welded portion P11 of the tip 31 of the metal plate tends to float outward towards the pipe diameter direction RD1. If the welded tip 31 of the metal plate is located inside the pipe diameter direction RD2, it is easier to press the water-stop rubber inside the pipe diameter direction RD2 with the thickened portion of the tip 31 compared to the case where it is located outside the pipe diameter direction RD1. Figure 5 As shown, the annular portion 30 has a plurality of pairs of openings 30s for inserting bolts 41 and nuts 42. The openings 30s open outward in the pipe diameter direction RD1 and outward in the pipe circumferential direction. Although two pairs of openings 30s are formed in this embodiment, the number of pairs of openings 30s can be appropriately changed according to the size of the metal strip 3 in the pipe axis direction AD.

[0036] The metal strip 3 is made of metal. In this embodiment, the metal strip 3 is made of SUS (stainless steel). Although not particularly limited, if it is SUS, it is preferable that the thickness of the metal plate constituting the metal strip 3 is 1.0 mm or more and 1.5 mm or less. In this embodiment, it is 1.2 mm. If the thickness of the metal plate is less than 1.0 mm, the metal strip 3 will elongate when the fastening mechanism 4 is tightened to apply a tensile load to the metal strip 3, making it impossible to properly compress the second waterstop 5. If the thickness of the metal plate exceeds 1.5 mm, it is difficult to bend the metal strip 3 by hand and to bend the metal strip 3 into a shape that matches the fluid pipe K.

[0037] <Fastening Mechanism 4>

[0038] Fastening mechanism 4 secures the circumferential ends of a plurality of metal strips 3 together. Fastening mechanism 4 includes bolts 41 and nuts 42. Figure 2 As shown, the fastening mechanism 4 includes: a rotating shaft 40, which passes through the annular portion 30 and is rotatable within the annular portion 30; and bolts 41 and nuts 42, which fasten the rotating shaft 40 together. The rotating shaft 40 is configured to rotate within the annular portion 30 of the metal strip 3. Thus, even if the distance between the annular portions 30 varies due to different installation positions of the metal strip 3, or if the metal strip 3 is used for various fluid pipes K with different radial dimensions, and even if the outer circumferential surface of the fluid pipe K has arbitrary curvature, because the rotating shaft 40 can rotate, a force parallel only to the bolt axis can act on the bolt 41 and nut 42. Therefore, the metal strip 3 can uniformly press the second waterstop 5 in the entire circumferential direction CD.

[0039] <First Water-Stopping Plate 6>

[0040] The first water-stopping plate 6 is formed of an elastomer such as rubber. Figure 1In the diagram, since the first waterstop plate 6 and the first metal plate 7 (described later) are obscured by the metal strip 3, they are represented by shaded areas. For example... Figure 1 As shown, the first waterstop 6 extends along the tube axis direction AD from the first metal strip 3' included in the first unit 1 to the second metal strip 3'' included in the second unit 2. The first metal strip 3' is the metal strip 3 among the plurality of metal strips 3 included in the first unit 1 used to press the first waterstop 6. The second metal strip 3'' is the metal strip 3 among the plurality of metal strips 3 included in the second unit 2 used to press the first waterstop 6. The first metal strip 3' and the second metal strip 3'' are adjacent to each other in the tube axis direction AD. The rubber hardness of the first waterstop 6 is preferably 50 degrees or more and 80 degrees or less. The rubber hardness is measured using a type C hardness tester at an environment of 23°C, based on the measurement method of Japanese JIS K7312.

[0041] like Figure 1 , Figures 4-5 , Figure 8 As shown, the circumferential length L2 of the first waterstop 6 is less than the circumferential length CD of the metal strip 3, which serves as the first metal strip 3' and the second metal strip 3''. Figure 4 As shown, the metal strip 3, which forms the first metal strip 3' and the second metal strip 3'', has a mark 33 indicating the placement position of the first water-stopping piece 6. In the first embodiment, the mark 33 is a triangular mark, indicating that the first water-stopping piece 6 is placed in the indication area Ar2 sandwiched by a plurality of marks 33. The indication area Ar2 is the middle area when the length L1 of the metal strip 3 along the pipe circumferential direction CD is divided into three equal parts. Therefore, the mark 33 only needs to indicate that the first water-stopping piece 6 is placed in all or part of the indication area Ar2, and the mark 33 is not limited to a triangular mark. If the first water-stopping piece 6 is deviated from the indication area Ar2, the metal strip 3 will not press the first water-stopping piece 6 sufficiently, and it will be unable to properly stop the leakage at the leaking part K1.

[0042] like Figures 8 to 10As shown, the inner circumferential surface 6a of the first waterstop 6 has: a plurality of first ribs 61 extending along a first direction (the pipe circumferential direction CD in the first embodiment); a plurality of second ribs 62 extending along a second direction intersecting the first direction (the pipe axis direction AD in the first embodiment); and a plurality of first recesses 64. The first ribs 61 and the second ribs 62 protrude further inward toward the pipe diameter direction RD2 than the bottom 64s of the first recesses 64. The first recesses 64 are formed by the plurality of first ribs 61 and the plurality of second ribs 62. The plurality of first ribs 61 and the plurality of second ribs 62 form a grid. One grid cell forming the grid becomes a first recess 64. In this embodiment, the shape of the first recesses 64 viewed from the inner side RD2 in the pipe diameter direction is rectangular (square), and the first recesses 64 appear as cuboids when viewed in three dimensions, but it is not limited to this; for example, it may also be rhomboid, circular, or elliptical.

[0043] The width of the first rib 61 and the second rib 62 is preferably 1 mm or more to withstand water pressure. In the first embodiment, the width of the first rib 61 and the second rib 62 is 2.5 mm, but it is not limited to this value.

[0044] like Figure 9 and Figure 10 As shown, the inner circumferential surfaces of the first rib 61 and the second rib 62 are formed with minute protrusions 65, the width of which is less than 0.75 mm and the protrusion height is less than 0.75 mm. However, the minute protrusions 65 can be omitted. Alternatively, minute depressions with a width and depth of less than 0.75 mm can be formed instead of the minute protrusions 65. By providing the minute protrusions 65 or the minute depressions, minute irregularities such as rust or corrosion on the pipe surface can be absorbed.

[0045] like Figure 9 and Figure 10 As shown, a first metal plate 7 is disposed on the outer peripheral surface 6b of the first waterstop 6. The first metal plate 7 covers the entire outer peripheral surface 6b of the first waterstop 6 and is bonded to the first waterstop 6. Therefore, even if the first waterstop 6 is disposed in the gap between the first metal strip 3' and the second metal strip 3'', the first metal plate 7, pressed by the first metal strip 3' and the second metal strip 3'', can still properly press the first waterstop 6 to achieve water stop for the leaking part K1.

[0046] like Figure 8 and Figure 9 As shown, the outer end 6e of the first waterstop 6 in the pipe axis direction AD is located further inside the pipe axis direction AD than the outer end 7e of the first metal plate 7. This is because when the first waterstop 6 is subjected to pressure in the pipe diameter direction RD and the pressure of leaking water, and is about to deform outward in the pipe axis direction AD, the first metal plate 7 can support the first waterstop 6 and suppress the deformation of the first waterstop 6.

[0047] like Figure 10 As shown, the ends 6c and 6d of the first water-stop plate 6 in the pipe circumferential direction CD are both formed into a tapered shape. Therefore, after installation into the pipe, the step or gap between the first water-stop plate 6 and the pipe can be reduced, and the exposure of the pipe outside the leaking part can be suppressed. The first water-stop plate 6 has: tapered ends 6c and 6d located on both sides of the pipe circumferential direction CD; and a middle portion 6f located between the tapered ends 6c and 6d. The maximum thickness of the second water-stop plate 5 located in the middle portion 6f is constant. To achieve the desired water-stopping performance, preferably, the thickness at the middle portion 6f from the inner circumferential surface of the second water-stop plate 5 to the inner circumferential surface of the first water-stop plate 6 is at least 5 mm.

[0048] <Second Waterstop Plate 5>

[0049] The second waterstop 5 is formed of an elastomer such as rubber. The rubber hardness of the second waterstop 5 is preferably 60 degrees or higher and 80 degrees or lower. For example... Figure 2 and Figure 3 As shown, the second water-stopping piece 5 is disposed on the inner circumferential surface 3a of each of the plurality of metal strips 3. In this embodiment, the second water-stopping piece 5 is installed on the inner circumferential surface 3a of the metal strip 3 by an adhesive (not shown). Figure 2 As shown, with the plurality of metal strips 3 connected in a ring shape by the fastening mechanism 4, the fastening mechanism 4 is tightened, thereby pressing the second water-stopping plate 5 against the outer circumferential surface K2 of the fluid pipe K. Thus, the second water-stopping plate 5 seals the space between the metal strip 3 and the outer circumferential surface K2 of the fluid pipe K, preventing leakage from the fluid pipe K even if a new leakage occurs at a location other than where the first water-stopping plate 6 is located. Furthermore, since the second water-stopping plate 5 is located on the inner circumferential surface of the metal strip 3, corrosion caused by contact between different types of metals can be prevented. The plurality of second water-stopping plates 5 cover the entire circumferential direction CD of the pipe.

[0050] like Figure 3 As shown, the two sides of the circumferential ends 5c and 5d of the second water-stop 5 are both formed into a tapered shape. This allows the two second water-stops 5 to be adjacent in the circumferential direction CD, with the circumferential end 5d of one second water-stop 5 overlapping the circumferential end 5c of the other, thus preventing a step-like change in the thickness of the second water-stops 5. As a result, the outer circumferential surface of the fluid pipe K can be pressed as uniformly as possible.

[0051] like Figure 3As shown, a second metal plate 32 is disposed on the outer periphery (outer side RD1 in the pipe diameter direction) of the second waterstop 5. The second metal plate 32 is configured such that, when fastened using the fastening mechanism 4, it is positioned between two adjacent metal strips 3 in the pipe circumferential direction CD. The second metal plate 32 is embedded in and adhered to the corresponding recess of the second waterstop 5. The second metal plate 32 is provided to press the second waterstop 5 located between the metal strips 3. Preferably, the second metal plate 32 overlaps with the line connecting the center of the rotating shaft 40 and the fluid pipe K. Therefore, the fastening force can be appropriately transmitted to the second waterstop 5 using the fastening mechanism 4, thereby improving the sealing effect.

[0052] like Figure 6 and Figure 7 As shown, the inner circumferential surface 5a of the second waterstop 5 has: a plurality of third ribs 51 extending along the pipe circumferential direction CD; a plurality of fourth ribs 52 extending along the pipe axis direction AD; and a plurality of third recesses 54. The third ribs 51 and fourth ribs 52 protrude further inward toward the pipe diameter direction RD2 than the bottom 54s of the third recesses 54. The plurality of third recesses 54 are formed by being surrounded by the plurality of third ribs 51 and the plurality of fourth ribs 52. The plurality of third ribs 51 and the plurality of fourth ribs 52 form a grid. One grid cell forming the grid becomes a third recess 54. In this embodiment, the shape of the third recess 54 viewed from the inner side RD2 in the pipe diameter direction is rectangular (square), and the third recess 54 is cuboid when viewed in three dimensions, but it is not limited to this; for example, it may also be rhomboid, circular, or elliptical.

[0053] like Figure 6 and Figure 7 As shown, the plurality of third ribs 51 include an outermost rib 53 located at the outermost AD1 in the tube axis direction. The outermost end 53e of the outermost rib 53 in the tube axis direction is located further inward of the tube axis direction than the outermost end 3e of the metal strip 3 at the tube axis direction, at the innermost AD2. To withstand water pressure, the tube axis dimension D1 of the third ribs 51 and the outermost rib 53 is preferably 1 mm or more. In this embodiment, D1 is 2.5 mm, but it is not limited to this value.

[0054] Furthermore, in the event that the outermost rib 53 deforms outward in the pipe axis direction AD1 due to water pressure, to ensure that the deformed outermost rib 53 does not protrude from the second waterstop 5, preferably, the outer end 53e of the outermost rib 53 in the pipe axis direction is located further inward in the pipe axis direction AD2 than the outer end 5e of the second waterstop 5 in the pipe axis direction. The pipe axis direction dimension D3 from the outer end 53e of the outermost rib 53 in the pipe axis direction to the outer end 5e of the second waterstop 5 in the pipe axis direction is preferably more than 1 / 2 of the pipe axis direction dimension D1 of the outermost rib 53.

[0055] In addition, such as Figure 7As shown, minute protrusions 55 with a width and protrusion height of 0.75 mm or less are formed on the inner circumferential surfaces of the third rib 51 (including the outermost rib 53) and the fourth rib 52, but these minute protrusions 55 can be omitted. Alternatively, minute depressions with a width and depth of 0.75 mm or less can be formed instead of the minute protrusions 55. By providing the minute protrusions 55 or the minute depressions, minute irregularities such as rust or corrosion on the pipe surface can be absorbed.

[0056] like Figure 7 As shown, the outer peripheral surface 5b of the second water-stopping piece 5 is formed with a fourth recess 56 corresponding to at least a portion of the plurality of third recesses 54. The fourth recess 56 is disposed only within the range Ar1 that overlaps with the third recesses 54 when projected parallel to the pipe diameter direction RD. If the fourth recess 56 is located outside the aforementioned range Ar1, the support of the third rib 51 or the fourth rib 52 is weakened, and therefore, the third rib 51 or the fourth rib 52 cannot properly press against the outer peripheral surface K2 of the fluid pipe K. The fourth recess 56 of this embodiment appears circular when viewed along a line of sight parallel to the pipe diameter direction RD, and cylindrical when viewed in three dimensions, but is not limited to this. For example, the fourth recess 56 may also appear rectangular like the third recesses 54 when viewed along a line of sight parallel to the pipe diameter direction RD.

[0057] like Figure 3 As shown, the second waterstop 5 has: peripheral ends 5c and 5d formed in a tapered shape; and an intermediate portion 5f located between the peripheral ends 5c and 5d. The maximum thickness of the second waterstop 5 located in the intermediate portion 5f is constant.

[0058] <Leak Repair Methods>

[0059] A brief explanation of the assembly process (repair method) for leak repair parts.

[0060] First, such as Figure 11 As shown in the upper part, in the event of a leak W from the leak section K1 of the fluid pipe K, a plurality of metal strips 3 constituting the first unit 1 are arranged at intervals along the circumferential direction CD of the fluid pipe K. The plurality of metal strips 3 constituting the first unit 1 are positioned offset from the leak section K1 along the pipe axis direction AD to avoid being subjected to the water pressure of the water sprayed from the leak section K1.

[0061] Next, the circumferential ends of the plurality of metal strips 3 constituting the first unit 1 are temporarily fastened to each other using the fastening mechanism 4 (temporary fixing of bolts 41 and nuts 42).

[0062] Next, a first water-stopping plate 6 for covering the leaking part K1 is inserted between the first metal strip 3' constituting the first unit 1 and the fluid pipe K. In the first embodiment, the first water-stopping plate 6 and the first metal plate 7 are bonded together.

[0063] Next, as Figure 11 As shown in the lower part, a plurality of metal strips 3 constituting the second unit 2 are arranged at intervals along the circumferential direction CD of the fluid pipe K. The second metal strip 3'' constituting the second unit 2 is positioned to cover the first waterstop 6. The circumferential ends of the plurality of metal strips 3 constituting the second unit 2 are temporarily fastened by the fastening mechanism 4 (temporary fixing of bolts 41 and nuts 42).

[0064] Next, as Figure 12 As shown, after the fastening mechanism 4 constituting the first unit 1 and the second unit 2 completes the temporary fastening, the first unit 1 and the second unit 2 are offset along the tube axis direction AD, and the first water-stopping plate 6 moves to the position covering the leaking part K1.

[0065] Next, the first metal strip 3' and the second metal strip 3'' are positioned to cover the first water-stopping plate 6, which is then positioned to cover the leaking part K1. This is because when the first unit 1 and the second unit 2 move along the pipe axis AD, a gap may form between them, and this gap should be minimized. If the gap between the first unit 1 and the second unit 2 is too large, it may result in insufficient pressure on the first water-stopping plate 6, failing to achieve proper water sealing.

[0066] To achieve precise positioning, such as Figure 12 As shown, it is preferable to use a clamp 8 to clamp the first metal strip 3' and the second metal strip 3'' from both sides of the tube axis AD to perform the above positioning. Figure 12 This includes a schematic enlarged cross-sectional view taken along the tube axis AD, showing the positional relationship between the clamp 8 and the metal strip 3. The clamp 8 has: a pair of pressing members 80 that clamp the first metal strip 3' and the second metal strip 3'' from both sides in the tube axis AD; and a connecting member 81 that extends along the tube axis AD and is capable of securing the pair of pressing members 80. By securing the pair of pressing members 80 to the connecting member 81, the spacing between the pair of pressing members 80 is reduced. Thus, the pair of pressing members 80 can press the first metal strip 3' and the second metal strip 3'' together in a direction that brings them closer together. To prevent the first water-stopping sheet 6 from protruding from the metal strip 3, the clamp 8 is preferably positioned to cover the first water-stopping sheet 6. Furthermore, the clamp 8 is preferably positioned to clamp the first water-stopping sheet 6 from both sides in the tube axis AD.

[0067] Next, while held in position by the clamp 8, the fastening mechanisms 4 of the first unit 1 and the second unit 2 are formally tightened. As a result, the first water-stopping plate 6 stops the leakage at the leaking part K1.

[0068] Figure 13 yes Figure 1Cross-sectional view of section XII-XII. (e.g.) Figure 13 As shown, the leak in the fluid pipe K caused by the crack in K is stopped by the first water-stopping plate 6. A first metal plate 7 is bonded to the outer peripheral surface of the first water-stopping plate 6. The first metal strip 3' constituting the first unit 1 and the second metal strip 3'' constituting the second unit 2 press the first metal plate 7 through the second water-stopping plate 5. The first metal plate 7 presses the entire first water-stopping plate 6 against the outer peripheral surface K2 of the fluid pipe K. The first unit 1 is disposed on the first side AD3 in the pipe axis direction AD, and the second unit 2 is disposed on the second side AD4 in the pipe axis direction AD. The end of the first water-stopping plate 6 on the first side AD3 in the pipe axis direction AD is located closer to the first side AD3 than the fourth rib 52 of the second water-stopping plate 5 on the second side AD4 in the pipe axis direction AD. The end of the first water-stopping plate 6 on the second side AD4 in the pipe axis direction AD is located closer to the second side AD4 than the fourth rib 52 of the second water-stopping plate 5 on the first side AD3 in the pipe axis direction AD. Therefore, the first waterstop 6 can be appropriately pressed by using the plurality of fourth ribs 52 respectively provided on the second waterstop 5 of the first metal strip 3' and the second metal strip 3''.

[0069] like Figure 13 As shown, the length AD of the first waterstop 6 in the tube axis direction is greater than the width AD of both the first metal strip 3' and the second metal strip 3'' in the tube axis direction. This allows it to handle leaks in the leakage section K1, where the width is greater than the width of the metal strip 3 in the tube axis direction AD. The length AD of the first waterstop 6 in the tube axis direction is preferably a multiple of the length of the metal strip 3. This improves aesthetics and ease of installation.

[0070] Furthermore, the leak repair fitting of this embodiment is particularly suitable when the length of the leaking part K1 in the pipe axis direction AD is greater than the width of the metal strip 3 in the pipe axis direction AD.

[0071] <Second Implementation Method>

[0072] The leak repair accessory according to the second embodiment of the present invention will be described. The difference between the second embodiment and the first embodiment is that the first water-stopping plate 6 is provided with a second recess 66.

[0073] Figure 14 This illustrates the first waterstop 6 of the second embodiment with... Figure 9 The corresponding diagram. (For example...) Figure 14As shown, a second recess 66 is formed on the outer peripheral surface 6b of the first waterstop 6, corresponding to at least a portion of the first recesses 64 among a plurality of first recesses 64. The second recess 66 is disposed only within the range Ar3 that overlaps with the first recesses 64 when projected parallel to the pipe diameter direction RD. If the second recess 66 is located outside the aforementioned range Ar3, the support of the first rib 61 or the second rib 62 is weakened, and therefore, the first rib 61 or the second rib 62 cannot properly press against the outer peripheral surface K2 of the fluid pipe K. The second recess 66 of the second embodiment is circular when viewed along a line of sight parallel to the pipe diameter direction RD, and cylindrical when viewed in three dimensions, but is not limited to being circular. For example, when viewed along a line of sight parallel to the pipe diameter direction RD, the second recess 66 may also be rectangular like the first recess 64. The second recess 66 of the second embodiment is smaller than the first recess 64 when viewed along a line of sight parallel to the pipe diameter direction RD. As a result, the pressing force of the first rib 61 or the second rib 62 on the outer peripheral surface K2 of the fluid pipe K can be enhanced.

[0074] Tighten the fastening mechanism 4 to reduce the diameter between the plurality of metal strips 3, and press the first water-stop plate 6 against the outer peripheral surface K2 of the fluid pipe K. Water is an incompressible fluid. When each of the first recesses 64 is filled with water, the water will become the resistance to the compression of the first ribs 61 and the second ribs 62 in the first water-stop plate 6. Since a second recess 66 is provided on the outer peripheral side (outer side RD1 in the pipe diameter direction) of the first recess 64, when the first water-stop plate 6 is compressed, the part between the first recess 64 and the second recess 66 in the first water-stop plate 6 deforms outward RD1 in the pipe diameter direction. It can be compressed while keeping the volume of the first recess 64 constant. Therefore, even if the first recess 64 is filled with water, it can easily prevent leakage.

[0075] When the first waterstop 6 is in its natural state (non-compressed state) without external force, the volume of each first recess (64) is preferably greater than or equal to the volume change of a second recess 66 when it is compressed by 1 mm in the pipe diameter direction RD. Furthermore, the volume of each second recess (66) is preferably greater than or equal to the volume change of a first recess 64 when it is compressed by 1.5 mm in the pipe diameter direction RD. The aforementioned volume change can be approximately calculated by multiplying the bottom area of ​​the first recess 64 by the compression amount (1 mm to 1.5 mm).

[0076] <Third Implementation Method>

[0077] The leak repair accessory of the third embodiment of the present invention will be described. Figure 15 This is a cross-sectional view showing the first water-stop plate 106 and the second water-stop plate 105 along the pipe axis direction AD and the pipe diameter direction RD. Figure 16 yes Figure 15 Cross-sectional view of the XVI-XVI section.

[0078] The difference between the third embodiment and the first embodiment is that the first metal plate 7, which is bonded to the first waterstop 106, is omitted, and the first waterstop 106 and the second waterstop 105 are provided with interlocking concave and convex shapes.

[0079] like Figure 15 and Figure 16 As shown, a second water-stop sheet 105 is bonded to the inner circumferential surface of the first metal strip 3'' constituting the first unit 1. A second water-stop sheet 105 is bonded to the inner circumferential surface of the second metal strip 3'' constituting the second unit 2. No metal plate is bonded to the outer circumferential surface of the first water-stop sheet 106.

[0080] A first concave-convex shape 106P is formed on the outer peripheral surface of the first waterstop 106. A second concave-convex shape 105P is formed on the inner peripheral surface of the second waterstop 105. The first and second concave-convex shapes can be interlocked. By interlocking the first and second concave-convex shapes, the relative movement of the first waterstop 106 relative to the second waterstop 105 along the pipe axis direction AD is restricted.

[0081] In the third embodiment, the first convex-concave shape 106P is a convex portion extending parallel to the pipe circumferential direction CD, and the second convex-concave shape 105P is a concave portion extending along the pipe circumferential direction CD, but it is not limited thereto. For example, the first convex-concave shape 106P can be a concave portion, and the second convex-concave shape 105P can be a convex portion. A concave portion larger than the pipe circumferential direction CD of the first waterstop 106 and accommodating a portion of the first waterstop 6 is formed on the second waterstop 105. The second convex-concave shape 105P is formed by protruding from the bottom of the concave portion toward the first waterstop 106. The first convex-concave shape 106P extends from one end of the first waterstop 106 in the pipe circumferential direction CD to the other end. As a result, deformation of a portion of the first waterstop 106 along the pipe axis direction AD can be suppressed. In order to achieve the water-stopping performance, the thickness from the inner circumferential surface of the second waterstop 105 to the inner circumferential surface of the first waterstop 106 is preferably at least 3 mm.

[0082] <Fourth Implementation Method>

[0083] The leak repair accessory of the fourth embodiment of the present invention will be described. Figure 17 This is a top view showing the first waterstop 206 and the first metal plate 7 bonded to the outer peripheral surface of the first waterstop 206, viewed along a line of sight parallel to the pipe diameter direction RD. Figure 17 In the image, the first metal plate 7 is represented by a shaded area. Figure 18 yes Figure 17 Cross-sectional view of the XVIII-XVIII section.

[0084] like Figure 17 and Figure 18As shown, a second waterstop 205 is bonded to the inner circumferential surface of the first metal strip 3'' constituting the first unit 1. A second waterstop 205 is also bonded to the inner circumferential surface of the second metal strip 3'' constituting the second unit 2. A first metal plate 7 is bonded to the outer circumferential surface of the first waterstop 206. The first metal plate 7 bonded to the first waterstop 206 is not disposed on the entire outer circumferential surface of the first waterstop 206, but only on a portion of the outer circumferential surface of the first waterstop 206. The first metal plate 7 is disposed on... Figure 17 The shaded area. For example... Figure 17 As shown, a first concave-convex shape 206P is formed on the outer peripheral surface of the first waterstop 206 at the portion Ar4 where the first metal plate 7 is not disposed. A second concave-convex shape 105P is formed on the inner peripheral surface of the second waterstop 105. The first and second concave-convex shapes can be interlocked. By interlocking the first and second concave-convex shapes, the movement of the first waterstop 206 relative to the second waterstop 205 along the pipe axis direction AD is restricted. The first concave-convex shape 206P extends from one end to the other in the pipe circumferential direction CD at the portion Ar4 where the first metal plate 7 is not disposed on the outer peripheral surface of the first waterstop 206. This suppresses deformation of a portion of the first waterstop 206 along the pipe axis direction AD. To achieve the water-stopping performance, the thickness from the inner peripheral surface of the second waterstop 205 to the inner peripheral surface of the first waterstop 206 is preferably at least 3 mm.

[0085] Furthermore, in the fourth embodiment, the first concave-convex shape 206P is a concave portion extending parallel to the pipe circumferential direction CD, and the second concave-convex shape 205P is a convex portion extending along the pipe circumferential direction CD, but it is not limited thereto. For example, the first concave-convex shape 206P can be a convex portion, and the second concave-convex shape 205P can be a concave portion.

[0086] <Variation Example>

[0087] (A) In the above embodiment, the first unit 1 and the second unit 2 are first positioned at a position offset from the leaking part K1 along the pipe axis direction AD without covering the leaking part K1. Then, the first unit 1 and the second unit 2 are moved along the pipe axis direction AD. However, this is not limited to this, and the first unit 1, the second unit 2, and the first water-stopping plate 6 may not be moved along the pipe axis direction AD. For example, the first water-stopping plate 6 may be positioned to cover the leaking part K1. The metal strips 3 of the first unit 1 and the second unit 2 may be arranged to cover the first water-stopping plate 6, and the fastening mechanism 4 may be temporarily tightened. The first metal strip 3' and the second metal strip 3'' may be clamped from both sides of the pipe axis direction AD using the clamp 8. Under the state of being positioned by the clamp 8, the fastening mechanisms 4 of the first unit 1 and the second unit 2 may be formally tightened.

[0088] Alternatively, as another example, the metal strip 3 constituting the first unit 1 can be positioned to cover the leaking part K1 and temporarily tightened with a fastening mechanism. The first water-stopping plate 6 can be positioned between the metal strip 3 of the first unit 1 and the fluid pipe K and cover the leaking part K1. The metal strip 3 constituting the second unit 2 can be positioned to cover the first water-stopping plate 6 and temporarily tightened. The fastening mechanisms 4 of the first unit 1 and the second unit 2 can then be formally tightened.

[0089] That is, it is sufficient to first perform the step of positioning the first metal strip 3' and the second metal strip 3'' to cover the first waterstop 6, and then perform the step of formally tightening the respective fastening mechanisms 4 of the first unit 1 and the second unit 2. The order of the temporary tightening steps of the fastening mechanisms 4 of the first unit 1 and the second unit 2, the configuration steps of the first unit 1, the configuration steps of the second unit 2, and the configuration steps of the first waterstop 6 performed before the above positioning and tightening steps is different.

[0090] (B) Although a second water-stopping plate 5 is provided on the inner circumferential surface of the metal strip 3 in the above embodiment, the second water-stopping plate 5 can be omitted if the first water-stopping plate 6 can stop the leakage part K1.

[0091] (C) In the above embodiments, the first waterstop sheet 6 is integrally formed of an elastomer such as rubber, but is not limited thereto. For example, a plurality of sheet components may be bonded together to form the first waterstop sheet 6.

[0092] (D) In ​​the first embodiment, the second water-stop sheet 5 is fixed to the metal strip 3 by adhesive bonding, but it is not limited to this, and the second water-stop sheet 5 may not be fixed to the metal strip 3.

[0093] (E) The annular portion 30 of the metal strip 3 is formed by bending and welding the metal plate, but it can also be formed by other methods.

[0094] (F) The welded top end 31 of the metal plate can be configured in a position outside the pipe diameter RD1.

[0095] (G) In the above embodiment, a first recess 64 and a second recess 66 are formed in the first waterstop 6, and a third recess 54 and a fourth recess 56 are formed in the second waterstop 5. Although the water-stopping performance may be reduced, these recesses may be omitted.

[0096] (H) In the third and fourth embodiments, the protrusions constituting the first concave-convex shapes 106P, 206P and the second concave-convex shapes 105P, 205P extend parallel to the pipe circumferential direction CD, but are not limited thereto as long as the movement of the first water-stop plate 106 relative to the second water-stop plate 105 along the pipe axis direction AD can be restricted.

[0097] (I) In the above embodiment, a method for installing a leak repair fitting is described as an example when a leak W occurs in the leaking part K1 of the fluid pipe K. However, the "leaking part" is not limited to the installation of fittings when a leak W occurs. It also includes installing fittings on leaking parts (cracks) where the fluid pipe K is shut off after a leak has occurred.

[0098] [1]

[0099] As described above, although not particularly limited, as in the first to fourth embodiments, the leak repair fitting installed on the leaking part K1 of the fluid pipe K can have: a first unit 1 having a fastening mechanism 4 and a plurality of metal strips 3, the plurality of metal strips 3 being arranged at intervals along the circumferential direction CD of the fluid pipe K, and the fastening mechanism 4 fastening the circumferential ends of the plurality of metal strips 3 to each other; and a second unit 2 having a fastening mechanism 4 and a plurality of metal strips 3, the plurality of metal strips 3 being arranged at intervals along the circumferential direction CD of the fluid pipe K. Fastening mechanism 4 fastens the circumferential ends of a plurality of metal strips 3 to each other, the second unit is arranged adjacent to the first unit; and a first water-stopping plate 6, formed of an elastic body, extends along the pipe axis direction AD from the first metal strip 3' included in the first unit to the second metal strip 3'' included in the second unit, the circumferential length L2 of the first water-stopping plate 6 is less than the circumferential length L1 of the first metal strip 3' and the second metal strip 3'', and the first water-stopping plate 6 is pressed against the outer circumferential surface K2 of the fluid pipe K by the first metal strip 3' and the second metal strip 3''.

[0100] According to this structure, the first water-stopping piece 6 can be used to deal with water leakage caused by cracks extending along the pipe axis AD.

[0101] [2]

[0102] According to the leak repair fittings described above [1], a second water-stopping plate 5 can also be provided on the inner circumferential surface of each of the plurality of metal strips 3 constituting the first unit 1 and the second unit 2.

[0103] According to this structure, even if a new leak occurs outside the area where the first water-stopping plate 6 is located, leakage in the fluid pipe K can be prevented. Furthermore, since the second water-stopping plate 5 is disposed on the inner circumferential surface of the metal strip 3, corrosion caused by contact between different types of metals can be prevented.

[0104] [3]

[0105] According to the leak repair fittings described in [1] or [2] above, a first metal plate 7 can also be provided on the outer peripheral surface of the first water-stopping piece 6.

[0106] According to this structure, by pressing the first water-stopping piece 6 against the first metal strip 3' and the second metal strip 3', the first water-stopping piece 6 can be prevented from moving outward AD in the direction of the tube axis, thereby improving the water-stopping performance. In addition, even if a gap is generated between the first metal strip 3' and the second metal strip 3', the first metal plate 7 can cover it, thereby improving the water-stopping performance.

[0107] [4]

[0108] According to the leak repair fitting described above [3], the inner circumferential surface of the first water-stopping plate 6 may have a plurality of first recesses 64, and the outer circumferential surface of the first water-stopping plate 6 may have a second recess 66 corresponding to at least a portion of the plurality of first recesses 64 respectively. The second recess 66 may be disposed only within the range that overlaps with the first recess 64 when projected parallel to the pipe diameter direction RD.

[0109] According to this structure, since the second recess 66 formed on the outer peripheral surface of the first water-stopping plate 6 is only disposed within the range Ar1 overlapping with the first recess 64, and the second recess 66 is not disposed at the position overlapping with the first rib 61 and the second rib 62, the water-stopping effect produced by the first rib 61 and the second rib 62 properly pressing the outer peripheral surface K2 of the fluid pipe K is not impaired. Furthermore, since the second recess 66 is located on the outer peripheral side of the first recess 64, even if the first recess 64 is filled with water, the portion between the first recess 64 and the second recess 66 in the first water-stopping plate 6 can deform outward in the pipe diameter direction RD1. Through this deformation, even when the first recess 64 is filled with water, the first water-stopping plate 6 can be compressed, avoiding compression resistance caused by water leakage, and the first water-stopping plate 6 can be appropriately compressed to achieve a seal.

[0110] [5]

[0111] According to any one of the above [1] to [4] leak repair fittings, the first metal strip 3' and the second metal strip 3' may also have a mark 33, which indicates the position of the first water-stopping plate 6.

[0112] According to this structure, the first waterstop plate 6 can be installed in a state that allows for proper compression, regardless of the installer's technique. Furthermore, the position of the first waterstop plate 6 can be visually confirmed after installation.

[0113] [6]

[0114] According to the leak repair fitting described above [2], a first concave-convex shape 106P can also be formed on the outer peripheral surface of the first water-stopping plate 106, and a second concave-convex shape 105P can be formed on the inner peripheral surface of the second water-stopping plate 105, with the first concave-convex shape 106P and the second concave-convex shape 105P fitting together.

[0115] According to this structure, the first water-stopping piece 106 can be prevented from moving outward in the direction AD of the pipe axis, thereby improving the water-stopping performance.

[0116] [7]

[0117] According to the leak repair fitting described above [6], the first concave-convex shape 106P can also extend from one end of the first water-stopping piece 106 in the pipe circumferential direction CD to the other end.

[0118] According to this structure, water leakage can be reliably suppressed due to the first water-stop plate 106 shifting along the pipe axis direction AD.

[0119] [8]

[0120] According to the leak repair fitting described above [6], a first metal plate 7 may also be provided on a part of the outer peripheral surface of the first water-stopping piece 206, and the first concave-convex shape 206P extends from one end of the pipe peripheral direction CD to the other end in the part Ar4 where the first metal plate 7 is not provided on the outer peripheral surface of the first water-stopping piece 206.

[0121] According to this structure, water leakage can be reliably suppressed due to the first water-stop plate 106 shifting along the pipe axis direction AD.

[0122] [9]

[0123] According to any one of the above-mentioned leak repair fittings [1] to [8], the length of the first water-stopping plate 6 in the tube axis direction AD can also be greater than the width of the tube axis direction AD of each of the first metal strip 3' and the second metal strip 3'.

[0124] According to this structure, it is possible to handle leakage of the leakage section K1, which is wider than the width of the tube axis AD of the metal strip 3.

[10]

[0126] Although not specifically limited, as described in the above embodiments, the leak repair method may include: arranging a plurality of metal strips 3 constituting a first unit 1 at intervals along the circumferential direction CD of the fluid pipe K, and temporarily fastening the circumferential ends of the plurality of metal strips 3 constituting the first unit 1 to each other using a fastening mechanism 4; arranging a plurality of metal strips 3 constituting a second unit 2 at intervals along the circumferential direction CD of the fluid pipe K, and temporarily fastening the circumferential ends of the plurality of metal strips 3 constituting the second unit 2 to each other using a fastening mechanism 4; positioning the first metal strip 3' included in the first unit 1 and the second metal strip 3 included in the second unit 2 adjacent to the first unit 1 at a position covering the first water-stopping piece 6 formed of an elastomer and used to cover the leaking part K1; and formally fastening the fastening mechanisms 4 of the first unit 1 and the second unit 2 respectively.

[11]

[0128] According to the leak repair method described above

[10] , a clamp 8 is used to hold the first metal strip 3' and the second metal strip 3'' from both sides of the pipe axis AD for positioning, and the formal tightening is performed while maintaining the positioning by the clamp 8.

[0129] It is able to properly install leak repair accessories.

[0130] According to any one of [1] to [9] above, the part of the first metal strip 3' and the second metal strip 3'' that presses the first water-stopping piece 6 is a plate-shaped part with a constant thickness. Using this plate-shaped part, the first metal strip 3' and the second metal strip 3'' can be bent along the outer peripheral surface K2 of the fluid pipe K.

[0131] The embodiments of the present invention have been described above with reference to the accompanying drawings, but it should be understood that the specific structure is not limited to these embodiments. The scope of the present invention is defined not only by the description of the above embodiments but also by the claims, and includes all modifications having the same meaning and scope as the claims.

[0132] The structures used in the above embodiments can be applied to any other embodiments. The specific configuration of each part is not limited to the above embodiments, and various modifications can be made as long as they do not deviate from the spirit of the present invention.

[0133] Explanation of reference numerals in the attached figures

[0134] 1: Unit 1

[0135] 2: Unit Two

[0136] 3: Metal strip

[0137] 3': First metal strip

[0138] 3'': Second metal strip

[0139] 4: Fastening mechanism

[0140] 5: Second waterstop plate

[0141] 6: First water-stopping plate

[0142] 8: Fixture

[0143] 33: Logo

[0144] 64: First recess

[0145] 66: Second recess

[0146] 105, 205: Second waterstop plate

[0147] 105P, 205P: Second concave-convex shape

[0148] 106, 206: First water-stop plate

[0149] 106P, 206P: First concave-convex shape

[0150] AD: Pipe axis direction

[0151] CD: Pipe circumferential direction

[0152] K: Fluid pipeline

[0153] K1: Leaking section

[0154] K2: outer peripheral surface

[0155] RD: Pipe diameter direction

[0156] W: Leaking

Claims

1. A leak repair fitting, installed on the leaking part of a fluid pipeline, wherein, The leak repair accessories have the following features: The first unit has a fastening mechanism and a plurality of metal strips, the plurality of metal strips being arranged at intervals along the circumferential direction of the fluid conduit, and the fastening mechanism fastening the circumferential ends of the plurality of metal strips to each other. The second unit has a fastening mechanism and a plurality of metal strips, the plurality of metal strips being spaced apart along the circumferential direction of the fluid conduit, the fastening mechanism fastening the circumferential ends of the plurality of metal strips to each other, and the second unit being configured adjacent to the first unit. as well as The first water-stopping plate, formed of an elastomer, extends along the tube axis from the first metal strip included in the first unit to the second metal strip included in the second unit. The circumferential length of the first water-stopping piece is less than the circumferential length of the first metal strip and the second metal strip, and the first water-stopping piece is pressed against the outer circumferential surface of the fluid pipe by the first metal strip and the second metal strip.

2. The leak repair fitting according to claim 1, wherein, A second water-stop plate is provided on the inner circumferential surface of each of the plurality of metal strips constituting the first unit and the second unit.

3. The leak repair fitting according to claim 1 or 2, wherein, A metal plate is provided on the outer peripheral surface of the first waterstop.

4. The leak repair fitting according to claim 3, wherein, The inner circumferential surface of the first water-stopping piece has a plurality of first recesses. The outer peripheral surface of the first waterstop is provided with the outer peripheral surface of the metal plate, and has a second recess corresponding to at least a portion of the first recess among a plurality of the first recesses. The second recess is only disposed within the range that overlaps with the first recess when projected parallel to the pipe diameter direction.

5. The leak repair fitting according to claim 1, wherein, The first metal strip and the second metal strip are marked with identifiers that indicate the location where the first waterstop is configured.

6. The leak repair fitting according to claim 2, wherein, The outer peripheral surface of the first water-stopping sheet has a first concave-convex shape. The inner circumferential surface of the second water-stopping piece has a second concave-convex shape. The first concave-convex shape and the second concave-convex shape fit together.

7. The leak repair fitting according to claim 6, wherein, The first concave-convex shape extends from one end of the first waterstop sheet in the circumferential direction to the other end.

8. The leak repair fitting according to claim 6, wherein, A metal plate is provided on a portion of the outer peripheral surface of the first water-stopping sheet. The first concave-convex shape extends from one end to the other in the circumferential direction of the pipe at the portion of the outer peripheral surface of the first waterstop where the metal plate is not provided.

9. The leak repair fitting according to claim 1, wherein, The length of the first waterstop in the axial direction is greater than the width in the axial direction of each of the first metal strip and the second metal strip.

10. A method for repairing leaks in a fluid pipeline, wherein, The leak repair method includes: The step of temporarily fastening the circumferential ends of the plurality of metal strips constituting the first unit to each other using a fastening mechanism is as follows: The step of temporarily fastening the circumferential ends of the plurality of metal strips constituting the second unit to each other using a fastening mechanism is as follows: The step of positioning the first metal strip included in the first unit and the second metal strip included in the second unit adjacent to the first unit to cover the position of the first water-stopping sheet formed of an elastomer and used to cover the leaking part; and The steps for formally tightening the fastening mechanisms of the first unit and the second unit respectively.

11. The leak repair method according to claim 10, wherein, The positioning is performed using clamps that hold the first and second metal strips from both sides in the direction of the tube axis. The formal fastening is performed while maintaining the positioning achieved by the clamp.

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