Water leakage repair metal fitting and water leakage repair method

Abstract

This water leakage repair metal fitting includes: a first unit 1 having a plurality of metal bands 3 provided at intervals in a pipe circumferential direction of a fluid pipe K, and a fastening mechanism 4 for fastening together pipe-circumferential-direction end parts of the plurality of metal bands 3; a second unit 2 having a plurality of metal bands 3 provided at intervals in the pipe circumferential direction of the fluid pipe K, and a fastening mechanism 4 for fastening together pipe-circumferential-direction end parts of the plurality of metal bands 3, the second unit 2 being disposed adjacent to the first unit 1; and a first water stop sheet 6 formed of an elastic body and extending in a pipe axial direction AD from a first metal band 3' included in the first unit 1 to a second metal band 3'' included in the second unit 2. The length L2 in the pipe circumferential direction of the first water stop sheet 6 is smaller than the length in the pipe circumferential direction of the first metal band 3' and the second metal band 3''. The first metal band 3' and the second metal band 3'' press the outer peripheral surface of the fluid pipe K.

Description

Leak repair fittings and leak repair methods

[0001] The present disclosure relates to a technology for repairing water leaks in fluid pipes such as water pipes.

[0002] A fluid pipe (such as a water pipe) installed outdoors, such as on an aqueduct, may leak due to corrosion of the pipe. A device for repairing a fluid pipe under a leaking condition is known (see, for example, Patent Document 1).

[0003] The water leak repair fitting described in Patent Document 1 includes a metal band that is wrapped around the leaking portion of the fluid pipe, a fastening mechanism that fastens the metal band, and a rubber sheet that is placed on the inner peripheral side of the metal band.

[0004] Japanese Patent Application Laid-Open No. 2023-013633

[0005] The water leak repair fitting disclosed in Patent Document 1 is suitable for repairing leaking parts such as pinholes, but it may be difficult to address water leaks from cracks extending in the axial direction of the pipe.

[0006] The present disclosure provides a water leakage repair technique that can address water leakage from cracks extending in the axial direction of a pipe.

[0007] The water leak repair fitting disclosed herein is a water leak repair fitting to be attached to a leaking portion of a fluid pipe, and comprises: a first unit having a plurality of metal bands spaced apart around the circumference of the fluid pipe and a fastening mechanism that fastens the circumferential ends of the plurality of metal bands together; a second unit having a plurality of metal bands spaced apart around the circumference of the fluid pipe and a fastening mechanism that fastens the circumferential ends of the plurality of metal bands together and disposed adjacent to the first unit; and a first water stop sheet made of an elastic body that extends in the axial direction of the pipe from the first metal band included in the first unit to the second metal band included in the second unit, wherein the circumferential length of the first water stop sheet is smaller than the circumferential lengths of the first metal bands and the second metal bands, and the first water stop sheet is pressed against the outer peripheral surface of the fluid pipe by the first metal bands and the second metal bands.

[0008] 1. A side view showing a water leak repair fitting attached to a fluid pipe according to the first embodiment. A cross-sectional view taken along line II-II in FIG. 1. A side view showing the metal band and the second water stop sheet integrated with the metal band before attachment to the fluid pipe. A plan view showing the metal band. A side view showing the metal band. A view of the second water stop sheet as viewed from the inner circumferential surface side (inside in the pipe radial direction). A cross-sectional view taken along line V-V in FIG. 6. A view of the first water stop sheet as viewed from the inner circumferential surface side (inside in the pipe radial direction). A cross-sectional view taken along line IX-IX in FIG. 8. A cross-sectional view taken along line X-X in FIG. 8. A diagram showing the steps of a water leak repair method using a water leak repair fitting. A diagram showing the steps of a water leak repair method using a water leak repair fitting. A cross-sectional view taken along line XIII-XIII in FIG. 1. A view corresponding to FIG. 9 showing the first water stop sheet of the second embodiment. A cross-sectional view taken along line XVI-XVI in FIG. 15. 17 is a plan view showing the first water stop sheet and the first metal plate adhered to the outer peripheral surface of the first water stop sheet, as viewed in a direction parallel to the pipe diameter direction.

[0009] First Embodiment A water leakage repair fitting and a water leakage repair method according to a first embodiment of the present disclosure will be described below with reference to the drawings.

[0010] As shown in Figures 1 and 2, a water leak repair fitting is attached to a leaking portion K1 of a fluid pipe K, such as a water pipe. The water leak repair fitting of the first embodiment stops water leaking at the leaking portion K1 caused by a crack extending in the pipe axis direction AD of the fluid pipe K. Such a crack may occur at a weld extending in the pipe axis direction AD of the fluid pipe K. The water leak repair fitting includes a first unit 1, a second unit 2 arranged adjacent to the first unit 1, and a first waterstop sheet 6 for stopping water leaking at the leaking portion K1. The first unit 1 has multiple metal bands 3, a fastening mechanism 4, and a second waterstop sheet 5. The second unit 2 has multiple metal bands 3, the fastening mechanism 4, and the second waterstop sheet 5. The first unit 1 and the second unit 2 are arranged in different positions relative to the fluid pipe K, but the metal bands 3, the fastening mechanism 4, and the second waterstop sheet 5 constituting each unit are identical in structure.

[0011] The term "metal fittings" in the water leak repair fittings indicates that the material of the multiple metal bands 3 is metal, and does not mean that the material of other components, such as the water stop sheet, is limited to metal.

[0012] <Metal Bands 3> Multiple metal bands 3 are provided at intervals in the pipe circumferential direction CD of the fluid pipe K. As shown in FIGS. 3 , 4 , and 5 , each metal band 3 has an annular portion 30 at each end in the pipe circumferential direction CD. The annular portion 30 is formed by bending a metal sheet and welding tips 31 on both sides of the metal sheet in the pipe circumferential direction CD to the metal sheet. In the embodiment shown in the figures, the metal bands 3 are positioned such that the welded tips 31 of the metal sheet face the inner side RD2 in the pipe radial direction. When the metal sheet is bent to form the annular portions 30, the welded portion P11 of the metal sheet tips 31 tends to float toward the outer side RD1 in the pipe radial direction. When the welded metal sheet tips 31 are located on the inner side RD2 in the pipe radial direction, the thick portion of the tips 31 more easily presses against the water-stop rubber on the inner side RD2 in the pipe radial direction than when they are located on the outer side RD1 in the pipe radial direction. 5, the annular portion 30 has a plurality of pairs of openings 30s for inserting bolts 41 and nuts 42. The openings 30s are open toward the outer side in the pipe radial direction RD1 and the outer side in the pipe circumferential direction. In this embodiment, two pairs of openings 30s are formed, but the number of pairs can be changed as appropriate depending on the dimension of the metal band 3 in the pipe axis direction AD.

[0013] The metal band 3 is made of metal. In this embodiment, the metal band 3 is made of SUS. Although not particularly limited, in the case of SUS, the thickness of the metal sheet constituting the metal band 3 is preferably 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 sheet is less than 1.0 mm, when the fastening mechanism 4 is fastened and a tensile load is applied to the metal band 3, the metal band 3 will stretch and will not be able to properly compress the second waterstop sheet 5. If the thickness of the metal sheet exceeds 1.5 mm, it will be difficult to bend the metal band 3 by hand, making it difficult to bend the metal band 3 into a shape that matches the fluid pipe K.

[0014] <Fastening mechanism 4> The fastening mechanism 4 fastens the pipe circumferential ends of the multiple metal bands 3 together. The fastening mechanism 4 includes a bolt 41 and a nut 42. As shown in FIG. 2 , the fastening mechanism 4 includes a rotating shaft 40 inserted into the annular portion 30 and rotatable within the annular portion 30, and a bolt 41 and a nut 42 that fasten the rotating shafts 40 together. The rotating shaft 40 is configured to be rotatable within the annular portion 30 of the metal band 3. As a result, even if the distance between the annular portions 30 changes depending on the attachment position of the metal band 3, or even if the metal band 3 is used for various fluid pipes K with different diameters and the outer surface of the fluid pipe K has any curvature, the rotatability of the rotating shaft 40 allows only a force parallel to the bolt axis to act on the bolt 41 and the nut 42, thereby enabling the metal band 3 to uniformly press the second waterstop sheet 5 across the entire pipe circumferential direction CD.

[0015] <First Waterstop Sheet 6> The first waterstop sheet 6 is made of an elastic material such as rubber. In FIG. 1, the first waterstop sheet 6 and the first metal plate 7 (described later) are hidden by the metal band 3, and therefore are shown by hatching. As shown in FIG. 1, the first waterstop sheet 6 extends in the pipe axis direction AD from the first metal band 3' included in the first unit 1 to the second metal band 3'' included in the second unit 2. The first metal band 3' is a metal band 3 among the multiple metal bands 3 included in the first unit 1 that presses against the first waterstop sheet 6. The second metal band 3'' is a metal band 3 among the multiple metal bands 3 included in the second unit 2 that presses against the first waterstop sheet 6. The first metal band 3' and the second metal band 3'' are adjacent to each other in the pipe axis direction AD. It is preferable that the rubber hardness of the first waterstop sheet 6 be 50 degrees or more and 80 degrees or less. The rubber hardness is a hardness measured by a measuring method based on JIS K7312, and is measured in an environment of 23°C using a type C rubber.

[0016] As shown in Figures 1, 4-5, and 8, the length L2 of the first waterstop sheet 6 in the pipe circumferential direction is smaller than the length L1 along the pipe circumferential direction CD of the metal bands 3 that will become the first metal bands 3' and the second metal bands 3''. As shown in Figure 4, the metal bands 3 that will become the first metal bands 3' and the second metal bands 3'' have indicia 33 that specify the position where the first waterstop sheet 6 should be placed. In the first embodiment, the indicia 33 are triangular marks that indicate that the first waterstop sheet 6 should be placed in an indication area Ar2 sandwiched between multiple indicia 33. The indication area Ar2 is the middle area when the length L1 of the metal bands 3 along the pipe circumferential direction CD is divided into three equal parts. Therefore, the indicia 33 need only indicate that the first waterstop sheet 6 should be placed in all or part of the indication area Ar2, and the indicia 33 are not limited to triangular marks. If the first waterstop sheet 6 is positioned outside the indication area Ar2, the metal bands 3 may not press the first waterstop sheet 6 sufficiently, resulting in inadequate watertightness of the water leakage portion K1.

[0017] As shown in Figures 8 to 10, the inner surface 6a of the first waterstop sheet 6 has multiple first ribs 61 extending in a first direction (the pipe circumferential direction CD in the first embodiment), multiple second ribs 62 extending in a second direction (the pipe axis direction AD in the first embodiment) intersecting the first direction, and multiple first recesses 64. The first ribs 61 and the second ribs 62 protrude toward the inside in the pipe radial direction RD2 beyond the bottom 64s of the first recesses 64. The first recesses 64 are formed by being closed by the multiple first ribs 61 and the multiple second ribs 62. The multiple first ribs 61 and the multiple second ribs 62 form a mesh. Each cell constituting the mesh corresponds to one first recess 64. In this embodiment, the shape of the first recesses 64 when viewed from the inside in the pipe radial direction RD2 is rectangular (square), and when viewed three-dimensionally, the first recesses 64 are rectangular parallelepipeds. However, this is not limiting. For example, the first recesses 64 may be rhombic, circular, or elliptical.

[0018] 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 is not limited to this value.

[0019] 9 and 10, minute protrusions 65 having a width and protrusion height of 0.75 mm or less are formed on the inner peripheral surfaces of the first rib 61 and the second rib 62, but the minute protrusions 65 can be omitted. Also, minute recesses having a width and depth of 0.75 mm or less may be formed instead of the minute protrusions 65. By providing the minute protrusions 65 or minute recesses, minute irregularities such as rust and corrosion that occur on the pipe surface can be absorbed.

[0020] 9 and 10 , a first metal plate 7 is disposed on the outer peripheral surface 6b of the first water stop sheet 6. The first metal plate 7 covers the entire outer peripheral surface 6b of the first water stop sheet 6 and is adhered to the first water stop sheet 6. As a result, even if the first water stop sheet 6 is disposed in the gap between the first metal band 3' and the second metal band 3" the first metal plate 7 pressed by the first metal band 3' and the second metal band 3" can appropriately press the first water stop sheet 6, making it possible to stop water from leaking through the water leakage portion K1.

[0021] 8 and 9, the outer end 6e of the first water stop sheet 6 in the pipe axis direction AD is located more inward in the pipe axis direction AD than the outer end 7e of the first metal plate 7 in the pipe axis direction AD. This is because when the first water stop sheet 6 is pressed in the pipe radial direction RD and attempts to deform outward in the pipe axis direction AD due to the pressure of water leakage, the first metal plate 7 can support the first water stop sheet 6 and suppress deformation.

[0022] As shown in Figure 10, both ends 6c, 6d of the first waterstop sheet 6 in the pipe circumferential direction CD are tapered. This reduces steps and gaps between the first waterstop sheet 6 and the pipe even after installation, making it possible to prevent the pipe from being exposed except for the leaking portion. The first waterstop sheet 6 has tapered ends 6c, 6d on both sides in the pipe circumferential direction CD and an intermediate portion 6f between the tapered ends 6c, 6d. The maximum thickness of the second waterstop sheet 5 in the intermediate portion 6f is constant. The thickness from the inner peripheral surface of the second waterstop sheet 5 to the inner peripheral surface of the first waterstop sheet 6 in the intermediate portion 6f is preferably at least 5 mm to ensure watertight performance.

[0023] <Second Waterstop Sheet 5> The second waterstop sheet 5 is formed of an elastic material such as rubber. The rubber hardness of the second waterstop sheet 5 is preferably 60 degrees or more and 80 degrees or less. As shown in FIGS. 2 and 3 , the second waterstop sheet 5 is provided on the inner circumferential surface 3 a of each of the multiple metal bands 3. In this embodiment, the second waterstop sheet 5 is attached to the inner circumferential surface 3 a of the metal band 3 via an adhesive (not shown). As shown in FIG. 2 , the multiple metal bands 3 are connected in an annular shape by the fastening mechanism 4, and the fastening mechanism 4 is fastened, thereby pressing the second waterstop sheet 5 against the outer circumferential surface K2 of the fluid pipe K. This allows the second waterstop sheet 5 to seal the gap between the metal band 3 and the outer circumferential surface K2 of the fluid pipe K, preventing water leakage from the fluid pipe K even if a new water leak occurs at a location other than where the first waterstop sheet 6 is located. Furthermore, by providing the second waterstop sheet 5 on the inner circumferential surface of the metal band 3, corrosion due to contact between dissimilar metals can be prevented. The plurality of second waterproof sheets 5 cover the entire pipe in the circumferential direction CD.

[0024] As shown in Figure 3, both pipe circumferential end portions 5c, 5d of the second waterstop sheet 5 are tapered. This allows the two second waterstop sheets 5 to be adjacent to each other in the pipe circumferential direction CD, and the pipe circumferential end portion 5d of one second waterstop sheet 5 to overlap the pipe circumferential end portion 5c of the other second waterstop sheet 5, thereby preventing the thickness of the second waterstop sheet 5 from varying in a step-like manner. As a result, the outer circumferential surface of the fluid pipe K can be pressed as uniformly as possible.

[0025] As shown in FIG. 3 , a second metal plate 32 is disposed on the outer periphery (outer side RD1 in the pipe radial direction) of the second waterstop sheet 5. The second metal plate 32 is disposed so as to be located between two adjacent metal bands 3 in the pipe circumferential direction CD when fastened by the fastening mechanism 4. The second metal plate 32 is fitted into and adhered to a corresponding recess in the second waterstop sheet 5. The second metal plate 32 is provided to hold the second waterstop sheet 5 between the metal bands 3. The second metal plate 32 preferably overlaps a line connecting the rotation axis 40 to the center of the fluid pipe K. This allows the tightening force applied by the fastening mechanism 4 to be appropriately transmitted to the second waterstop sheet 5, improving the sealing effect.

[0026] As shown in Figures 6 and 7, the inner surface 5a of the second waterstop sheet 5 has multiple third ribs 51 extending in the pipe circumferential direction CD, multiple fourth ribs 52 extending in the pipe axial direction AD, and multiple third recesses 54. The third ribs 51 and the fourth ribs 52 protrude further toward the inside RD2 in the pipe radial direction than the bottom 54s of the third recesses 54. The third recesses 54 are closed by the multiple third ribs 51 and the multiple fourth ribs 52. The multiple third ribs 51 and the multiple fourth ribs 52 form a mesh. Each cell constituting the mesh corresponds to one third recess 54. In this embodiment, the shape of the third recesses 54 when viewed from the inside RD2 in the pipe radial direction is rectangular (square), and when viewed three-dimensionally, the third recesses 54 are rectangular parallelepipeds. However, this is not limiting. For example, the third recesses 54 may be rhombic, circular, or elliptical.

[0027] 6 and 7 , the multiple third ribs 51 include an outermost rib 53 located at the outermost side AD1 in the tube axis direction. The outermost end 53e of the outermost rib 53 is located at an inner side AD2 in the tube axis direction than the outermost end 3e of the metal band 3 in the tube axis direction. To withstand water pressure, the dimension D1 in the tube axis direction of the third rib 51 and the outermost rib 53 is preferably 1 mm or more. In this embodiment, D1 is 2.5 mm, but is not limited to this value.

[0028] Furthermore, in order to ensure that the deformed outermost rib 53 does not protrude from the second waterstop sheet 5 when the outermost rib 53 attempts to deform outward in the pipe axis direction AD1 due to water pressure, the outer end 53e of the outermost rib 53 in the pipe axis direction is preferably located inward in the pipe axis direction AD2 with respect to the outer end 5e of the second waterstop sheet 5. The dimension D3 in the pipe axis direction from the outer end 53e of the outermost rib 53 in the pipe axis direction to the outer end 5e of the second waterstop sheet 5 is preferably at least half the dimension D1 of the outermost rib 53 in the pipe axis direction.

[0029] As shown in Figure 7, minute protrusions 55 with a width and protrusion height of 0.75 mm or less are formed on the inner peripheral surfaces of the third rib 51 (including the outermost rib 53) and the fourth rib 52, but the minute protrusions 55 can be omitted. Also, instead of the minute protrusions 55, minute recesses with a width and depth of 0.75 mm or less may be formed. By providing the minute protrusions 55 or minute recesses, minute irregularities such as rust and corrosion that occur on the pipe surface can be absorbed.

[0030] As shown in FIG. 7 , fourth recesses 56 are formed on the outer surface 5b of the second waterstop sheet 5, corresponding to at least some of the third recesses 54. The fourth recesses 56 are located only within a range Ar1 that overlaps with the third recesses 54 when projected parallel to the pipe radial direction RD. If the fourth recesses 56 were located outside the range Ar1, the footing of the third rib 51 or the fourth rib 52 would be weakened, preventing the third rib 51 or the fourth rib 52 from properly pressing against the outer surface K2 of the fluid pipe K. In this embodiment, the fourth recesses 56 are circular when viewed parallel to the pipe radial direction RD and cylindrical when viewed in three dimensions, but are not limited to a circular shape. For example, the fourth recesses 56 may be rectangular, like the third recesses 54, when viewed parallel to the pipe radial direction RD.

[0031] 3, the second water blocking sheet 5 has tapered end portions 5c, 5d in the circumferential direction of the pipe and an intermediate portion 5f located between the end portions 5c, 5d in the circumferential direction of the pipe. The maximum thickness of the second water blocking sheet 5 in the intermediate portion 5f is constant.

[0032] <Water Leak Repair Method> The assembly process (repair method) for the water leak repair fitting will be briefly described. First, as shown in the upper part of FIG. 11 , in a situation where a water leak W is occurring from a leaking portion K1 of a fluid pipe K, the multiple metal bands 3 constituting the first unit 1 are arranged at intervals in the circumferential direction CD of the fluid pipe K. The multiple metal bands 3 constituting the first unit 1 are arranged in positions offset from the leaking portion K1 in the axial direction AD to avoid being subjected to the water pressure of water spurting from the leaking portion K1. Next, the circumferential ends of the multiple metal bands 3 constituting the first unit 1 are temporarily fastened together with the fastening mechanism 4 (temporarily fastening the bolts 41 and nuts 42). Next, a first waterstop sheet 6 is inserted between the first metal band 3′ constituting the first unit 1 and the fluid pipe K to cover the water leaking portion K1. In the first embodiment, the first waterstop sheet 6 and the first metal plate 7 are bonded together. Next, as shown in the lower part of Figure 11, the multiple metal bands 3 that constitute the second unit 2 are arranged at intervals in the pipe circumferential direction CD of the fluid pipe K. The second metal band 3" that constitutes the second unit 2 is arranged in a position that covers the first waterstop sheet 6. The pipe circumferential ends of the multiple metal bands 3 that constitute the second unit 2 are temporarily fastened together using the fastening mechanism 4 (temporarily fastening the bolts 41 and nuts 42). Next, as shown in Figure 12, after the temporary fastening using the fastening mechanism 4 that constitutes the first unit 1 and the second unit 2 is completed, the first unit 1 and the second unit 2 are shifted in the pipe axis direction AD so that the first waterstop sheet 6 is moved to a position that covers the water-leaking portion K1. Next, the first metal band 3' and the second metal band 3" are positioned to cover the first waterstop sheet 6 that is arranged to cover the water-leaking portion K1. This is to eliminate gaps between the first unit 1 and the second unit 2 as much as possible, as gaps may occur between the first unit 1 and the second unit 2 when the first unit 1 and the second unit 2 are moved along the pipe axis direction AD. If the gap between the first unit 1 and the second unit 2 is large, the gap may cause insufficient pressure on the first waterstop sheet 6, which may result in insufficient waterstopping. In order to achieve reliable positioning, it is preferable to perform the above positioning using a jig 8 that clamps the first metal band 3' and the second metal band 3" from both sides in the pipe axis direction AD, as shown in Figure 12.FIG. 12 includes a schematic enlarged cross-sectional view, viewed along the pipe axis direction AD, showing the positional relationship between the jig 8 and the metal band 3. The jig 8 includes a pair of pressing members 80 that sandwich the first metal band 3' and the second metal band 3" from both sides in the pipe axis direction AD, and a connecting member 81 that extends in the pipe axis direction AD and allows the pair of pressing members 80 to be fastened together. Fastening the pair of pressing members 80 to the connecting member 81 reduces the separation distance between the pair of pressing members 80. This allows the pair of pressing members 80 to press the first metal band 3' and the second metal band 3" toward each other. To prevent the first waterstop sheet 6 from protruding from the metal band 3, the jig 8 is preferably positioned to cover the first waterstop sheet 6. Furthermore, the jig 8 is preferably positioned to sandwich the first waterstop sheet 6 from both sides in the pipe axis direction AD. Next, while maintaining the positioning by the jig 8, the fastening mechanisms 4 of the first unit 1 and the second unit 2 are fully tightened. As a result, the first water-stopping sheet 6 stops water from leaking through the water-leaking portion K1.

[0033] FIG. 13 is a cross-sectional view of the XIII-XIII portion of FIG. 1. As shown in FIG. 13, a water leaking portion K1 caused by a crack in the fluid pipe K is watertightly stopped by a first waterstop sheet 6. A first metal plate 7 is bonded to the outer surface of the first waterstop sheet 6. The first metal band 3' constituting the first unit 1 and the second metal band 3'' constituting the second unit 2 press against the first metal plate 7 via the second waterstop sheet 5. The first metal plate 7 presses the entire first waterstop sheet 6 against the outer surface K2 of the fluid pipe K. The first unit 1 is disposed on a first side AD3 in the pipe axis direction AD, and the second unit 2 is disposed on a second side AD4 in the pipe axis direction AD. The end of the first waterstop sheet 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 first metal band 3' on the second waterstop sheet 5, which is closest to the second side AD4 in the pipe axis direction AD. The end of the first water stop sheet 6 on the second side AD4 in the pipe axis direction AD is located on the second side AD4 further than the fourth rib 52 that is closest to the first side AD3 in the pipe axis direction AD on the second water stop sheet 5 of the second metal band 3". This makes it possible to appropriately press the first water stop sheet 6 by the multiple fourth ribs 52 provided on the second water stop sheets 5 of the first metal band 3' and the second metal band 3".

[0034] As shown in Figure 13, the length in the pipe axis direction AD of the first water stop sheet 6 is greater than the width in the pipe axis direction AD of each of the first metal band 3' and second metal band 3''. This makes it possible to accommodate water leakage from a water leakage portion K1 that is greater than the width in the pipe axis direction AD of the metal band 3. It is preferable that the length in the pipe axis direction AD of the first water stop sheet 6 is a length that corresponds to a multiple of the metal band 3. This makes it possible to improve appearance and ease of installation. Furthermore, the water leakage repair fitting of this embodiment is suitable when the length in the pipe axis direction AD of the water leakage portion K1 is greater than the width in the pipe axis direction AD of the metal band 3.

[0035] Second Embodiment A water leak repair fitting according to a second embodiment of the present disclosure will now be described. The second embodiment differs from the first embodiment in that a second recess 66 is provided in the first water stop sheet 6 .

[0036] FIG. 14 is a diagram corresponding to FIG. 9 and shows a first waterstop sheet 6 of a second embodiment. As shown in FIG. 14 , second recesses 66 are formed on the outer surface 6b of the first waterstop sheet 6, corresponding to at least some of the first recesses 64. The second recesses 66 are located only within a range Ar3 that overlaps with the first recesses 64 when projected parallel to the pipe radial direction RD. If the second recesses 66 were located outside the range Ar3, the first rib 61 or the second rib 62 would not have a strong footing, preventing the first rib 61 or the second rib 62 from properly pressing the outer surface K2 of the fluid pipe K. In the second embodiment, the second recesses 66 are circular when viewed parallel to the pipe radial direction RD and cylindrical when viewed in three dimensions. However, the shape is not limited to a circle. For example, the second recesses 66 may be rectangular, similar to the first recesses 64, when viewed parallel to the pipe radial direction RD. The second recess 66 of the second embodiment is smaller than the first recess 64 when viewed in a line of sight parallel to the pipe radial direction RD. This makes it possible to increase the pressing force of the first rib 61 or the second rib 62 on the outer circumferential surface K2 of the fluid pipe K.

[0037] The fastening mechanism 4 is tightened to reduce the diameter between the multiple metal bands 3, compressing the first waterstop sheet 6 against the outer circumferential surface K2 of the fluid pipe K. Water is an incompressible fluid, and when each first recess 64 is filled with water, the first ribs 61 and second ribs 62 of the first waterstop sheet 6 provide resistance to compression. Because the second recess 66 is located on the outer circumferential side of the first recess 64 (the outer circumferential side RD1 in the pipe diameter direction), when the first waterstop sheet 6 is compressed, the portion of the first waterstop sheet 6 between the first recess 64 and the second recess 66 deforms toward the outer circumferential side RD1 in the pipe diameter direction. This allows the first recess 64 to be compressed while maintaining a constant volume, making it easier to stop leaks even when the first recess 64 is filled with water. In a natural state (uncompressed state) in which no external force is acting on the first waterstop sheet 6, the volume of each first recess 64 is preferably equal to or greater than the volume change that occurs when one second recess 66 is compressed 1 mm in the pipe diameter direction RD. More preferably, the volume of each second recess (66) is equal to or greater than the volume change when one first recess 64 is compressed 1.5 mm in the pipe radial direction RD. The 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).

[0038] Third Embodiment A water leak repair fitting according to a third embodiment of the present disclosure will now be described. FIG. 15 is a cross-sectional view of the first waterstop sheet 106 and the second waterstop sheet 105 taken along the pipe axis direction AD and the pipe diameter direction RD. FIG. 16 is a cross-sectional view of the XVI-XVI portion of FIG. 15. The third embodiment differs from the first embodiment in that the first metal plate 7 bonded to the first waterstop sheet 106 is eliminated, and the first waterstop sheet 106 and the second waterstop sheet 105 are provided with interlocking concave-convex shapes. As shown in FIGS. 15 and 16 , the second waterstop sheet 105 is bonded to the inner circumferential surface of the first metal band 3′ constituting the first unit 1. The second waterstop sheet 105 is bonded to the inner circumferential surface of the second metal band 3″ constituting the second unit 2. No metal plate is bonded to the outer circumferential surface of the first waterstop sheet 106. A first concave-convex shape 106P is formed on the outer circumferential surface of the first waterstop sheet 106. A second uneven shape 105P is formed on the inner circumferential surface of the second water-stopping sheet 105. The first uneven shape and the second uneven shape can fit together. The first uneven shape and the second uneven shape fit together, restricting movement of the first water-stopping sheet 106 in the pipe axis direction AD relative to the second water-stopping sheet 105. In the third embodiment, the first uneven shape 106P is a convex portion extending parallel to the pipe circumferential direction CD, and the second uneven shape 105P is a concave portion extending in the pipe circumferential direction CD, but this is not limited thereto. For example, the first uneven shape 106P may be a concave portion, and the second uneven shape 105P may be a convex portion. The second water-stopping sheet 105 is formed with a concave portion that is larger than the dimension of the first water-stopping sheet 106 in the pipe circumferential direction CD and that accommodates a portion of the first water-stopping sheet 6. The second uneven shape 105P is formed to protrude from the bottom of this concave portion toward the first water-stopping sheet 106. The first uneven shape 106P extends from one end to the other end in the pipe circumferential direction CD of the first water stop sheet 106. This makes it possible to prevent a portion of the first water stop sheet 106 from deforming in the pipe axis direction AD. The thickness from the inner peripheral surface of the second water stop sheet 105 to the inner peripheral surface of the first water stop sheet 106 is preferably at least 3 mm to ensure water stop performance.

[0039] Fourth Embodiment A water leak repair fitting according to a fourth embodiment of the present disclosure will now be described. FIG. 17 is a plan view, viewed from a line of sight parallel to the pipe diameter direction RD, showing a first waterstop sheet 206 and a first metal plate 7 bonded to the outer peripheral surface of the first waterstop sheet 206. In FIG. 17, the first metal plate 7 is indicated by hatching. FIG. 18 is a cross-sectional view of the XVIII-XVIII portion of FIG. 17. As shown in FIGS. 17 and 18, a second waterstop sheet 205 is bonded to the inner peripheral surface of a first metal band 3' constituting the first unit 1. A second waterstop sheet 205 is bonded to the inner peripheral surface of a second metal band 3'' constituting the second unit 2. A first metal plate 7 is bonded to the outer peripheral surface of the first waterstop sheet 206. The first metal plate 7 bonded to the first waterstop sheet 206 is disposed only over a portion of the outer peripheral surface of the first waterstop sheet 206, not the entire outer peripheral surface. The first metal plate 7 is disposed in the hatched portion of FIG. 17. As shown in FIG. 17 , a first uneven shape 206P is formed in a region Ar4 of the outer peripheral surface of the first water-stopping sheet 206 where the first metal plate 7 is not disposed. A second uneven shape 105P is formed on the inner peripheral surface of the second water-stopping sheet 105. The first uneven shape and the second uneven shape can fit together. The fit between the first uneven shape and the second uneven shape restricts movement of the first water-stopping sheet 206 in the pipe axis direction AD relative to the second water-stopping sheet 205. The first uneven shape 206P extends from one end to the other end in the pipe circumferential direction CD in the region Ar4 of the outer peripheral surface of the first water-stopping sheet 206 where the first metal plate 7 is not disposed. This prevents a portion of the first water-stopping sheet 206 from deforming in the pipe axis direction AD. The thickness from the inner peripheral surface of the second water-stopping sheet 205 to the inner peripheral surface of the first water-stopping sheet 206 is preferably at least 3 mm to ensure water-stopping performance. In the fourth embodiment, the first uneven shape 206P is a recess extending parallel to the pipe circumferential direction CD, and the second uneven shape 205P is a convex portion extending in the pipe circumferential direction CD, but this is not limiting. For example, the first uneven shape 206P may be a convex portion, and the second uneven shape 205P may be a concave portion.

[0040] <Modifications> (A) In the above embodiment, the first unit 1 and the second unit 2 are positioned in a position offset from the water leakage portion K1 in the pipe axis direction AD so as not to cover the water leakage portion K1, and then the first unit 1 and the second unit 2 are moved in the pipe axis direction AD. However, this is not limited to this, and the first unit 1, the second unit 2, and the first waterstop sheet 6 do not have to be moved in the pipe axis direction AD. For example, the first waterstop sheet 6 may be positioned in a position that covers the water leakage portion K1, the metal bands 3 of the first unit 1 and the second unit 2 may be positioned to cover the first waterstop sheet 6, the fastening mechanisms 4 may be temporarily fastened, the first metal band 3′ and the second metal band 3″ may be sandwiched from both sides in the pipe axis direction AD by the jig 8, and the fastening mechanisms 4 of the first unit 1 and the second unit 2 may be finally fastened in this state. As another example, the metal band 3 constituting the first unit 1 may be placed in a position covering the water-leaking portion K1 and the fastening mechanism 4 may be temporarily fastened, the first waterstop sheet 6 may be placed between the metal band 3 of the first unit 1 and the fluid pipe K in a position covering the water-leaking portion K1, the metal band 3 constituting the first unit 1 may be placed in a position covering the first waterstop sheet 6 and the fastening mechanism 4 may be temporarily fastened, and the fastening mechanisms 4 of each of the first unit 1 and the second unit 2 may be finally fastened. That is, it is sufficient to perform the step of positioning the first metal band 3' and the second metal band 3" in a position covering the first waterstop sheet 6, and then perform the step of finally fastening the fastening mechanisms 4 of each of the first unit 1 and the second unit 2. The steps of temporarily fastening the fastening mechanisms 4 of the first unit 1 and the second unit 2, the step of arranging the first unit 1, the step of arranging the second unit 2, and the step of arranging the first waterstop sheet 6, which are performed before the positioning step and the final fastening step, may be performed in any order.

[0041] (B) In the above embodiment, a second water-stopping sheet 5 is provided on the inner surface of the metal band 3, but if the first water-stopping sheet 6 is used to stop water from leaking from the water-leakage section K1, the second water-stopping sheet 5 can be omitted.

[0042] (C) In the above embodiment, the first waterproof sheet 6 is formed integrally from an elastic material such as rubber, but is not limited to this. For example, the first waterproof sheet 6 may be formed by bonding multiple sheet members together.

[0043] (D) In ​​the first embodiment, the second water-stopping sheet 5 is fixed to the metal band 3 by adhesive, but this is not limited to this, and the second water-stopping sheet 5 does not have to be fixed to the metal band 3.

[0044] (E) The annular portion 30 of the metal band 3 is formed by bending and welding a metal plate, but it may be formed by other methods.

[0045] (F) The welded tip 31 of the metal plate may be disposed in an orientation facing the outer side RD1 in the pipe radial direction.

[0046] (G) In the above embodiment, the first recess 64 and the second recess 66 are formed in the first water-stopping sheet 6, and the third recess 54 and the fourth recess 56 are formed in the second water-stopping sheet 5. Although this reduces the water-stopping performance, these recesses may be omitted.

[0047] (H) In the third and fourth embodiments, the convex portions constituting the first uneven shape 106P, 206P and the second uneven shape 105P, 205P extend parallel to the pipe circumferential direction CD, but this is not limited to this as long as it is possible to restrict the movement of the first water-stopping sheet 106 in the pipe axis direction AD relative to the second water-stopping sheet 105.

[0048] (I) In the above embodiment, a method for attaching a water leakage repair fitting when a water leak W is occurring from the leaking portion K1 of the fluid pipe K is described as an example, but the "water leaking portion" is not limited to attaching a fitting to a situation where a water leak W is occurring. It also includes shutting off the water supply to the fluid pipe K after a water leak and attaching a fitting to the leaking portion (crack) where a water leak has been confirmed.

[0049] [1] As described above, although not particularly limited, as in the first to fourth embodiments, a water leakage repair fitting to be attached to a water leakage portion K1 of a fluid pipe K may include: a first unit 1 having a plurality of metal bands 3 spaced apart in the circumferential direction CD of the fluid pipe K and a fastening mechanism 4 that fastens the circumferential ends of the plurality of metal bands 3 together; a second unit 2 that has a plurality of metal bands 3 spaced apart in the circumferential direction CD of the fluid pipe K and the fastening mechanism 4 that fastens the circumferential ends of the plurality of metal bands 3 together and is arranged adjacent to the first unit 1; and a first water stop sheet 6 made of an elastic body that extends in the pipe axis direction AD from the first metal band 3′ included in the first unit 1 to the second metal band 3″ included in the second unit 2, wherein the circumferential length L2 of the first water stop sheet 6 is smaller than the circumferential length L1 of the first metal band 3′ and the second metal band 3″, and the first water stop sheet 6 is pressed against the outer peripheral surface K2 of the fluid pipe K by the first metal band 3′ and the second metal band 3″. According to this configuration, the first water blocking sheet 6 can deal with water leakage from cracks extending in the pipe axis direction AD.

[0050] [2] In the water leak repair fitting described in [1] above, a second water stop sheet 5 may be provided on the inner circumferential surface of each of the multiple metal bands 3 constituting the first unit 1 and the second unit 2. With this configuration, it is possible to stop water leakage from the fluid pipe K even if a new water leak occurs in a location other than where the first water stop sheet 6 is provided. Furthermore, by providing the second water stop sheet 5 on the inner circumferential surface of the metal band 3, it is possible to prevent corrosion due to contact between dissimilar metals.

[0051] [3] In the water leak repair fitting described in [1] or [2] above, a first metal plate 7 may be provided on the outer peripheral surface of the first water stop sheet 6. With this configuration, the first water stop sheet 6 is pressed against the first metal band 3' and the second metal band 3'', preventing the first water stop sheet 6 from escaping to the outside AD1 in the axial direction of the pipe, thereby improving water stop performance. Furthermore, even if a gap occurs between the first metal band 3' and the second metal band 3'', the first metal plate 7 can cover it, improving water stop performance.

[0052] [4] In the water leak repair fitting described in [3] above, the inner peripheral surface of the first water stop sheet 6 may have a plurality of first recesses 64, and the outer peripheral surface of the first water stop sheet 6, on which the first metal plate 7 is provided, may have second recesses 66 corresponding to at least some of the first recesses 64, and the second recesses 66 may be arranged only within an area that overlaps with the first recesses 64 when projected parallel to the pipe radial direction RD. According to this configuration, the second recesses 66 formed on the outer peripheral surface of the first water stop sheet 6 are arranged only within an area Ar1 that overlaps with the first recesses 64, and the second recesses 66 are not arranged in a position that overlaps with the first rib 61 and the second rib 62, so that the water stop effect achieved by the first rib 61 and the second rib 62 appropriately pressing against the outer peripheral surface K2 of the fluid pipe K is not impaired. Furthermore, because the second recess 66 is located on the outer periphery of the first recess 64, even if the first recess 64 is filled with water, the portion of the first waterstop sheet 6 between the first recess 64 and the second recess 66 can be deformed toward the outer side RD1 in the pipe diameter direction. This deformation allows the first waterstop sheet 6 to be compressed even when the first recess 64 is filled with water, preventing compression from being hindered by water leakage and enabling the first waterstop sheet 6 to be appropriately compressed and sealed.

[0053] [5] In the water leak repair fittings described in any of [1] to [4] above, the first metal band 3' and the second metal band 3'' may have markings 33 that specify the position where the first water stop sheet 6 is to be placed. This configuration allows the first water stop sheet 6 to be attached in an appropriately compressible state regardless of the installer. Furthermore, the position of the first water stop sheet 6 can be visually confirmed even after installation.

[0054] [6] In the water leak repair fitting described in [2] above, a first uneven shape 106P may be formed on the outer peripheral surface of the first water stop sheet 106, and a second uneven shape 105P may be formed on the inner peripheral surface of the second water stop sheet 105, and the first uneven shape 106P and the second uneven shape 105P may fit together. This configuration prevents the first water stop sheet 106 from escaping outward in the pipe axis direction AD, thereby improving water stop performance.

[0055] [7] In the water leak repair fitting described in [6] above, the first uneven shape 106P may extend from one end to the other end in the pipe circumferential direction CD of the first water stop sheet 106. This configuration makes it possible to accurately prevent the first water stop sheet 106 from shifting in the pipe axial direction AD and causing water leakage.

[0056] [8] In the water leak repair fitting described in [6] above, the first metal plate 7 may be provided on a portion of the outer peripheral surface of the first water stop sheet 206, and the first uneven shape 206P may extend from one end to the other end in the pipe circumferential direction CD in a portion Ar4 of the outer peripheral surface of the first water stop sheet 206 where the first metal plate 7 is not provided. This configuration makes it possible to reliably prevent the first water stop sheet 106 from shifting in the pipe axial direction AD and causing water leakage.

[0057] [9] In the water leak repair fitting described in any one of [1] to [8] above, the length of the first water stop sheet 6 in the pipe axis direction AD may be greater than the width of each of the first metal band 3' and the second metal band 3" in the pipe axis direction AD. This configuration makes it possible to accommodate water leakage from a water leaking portion K1 that is greater than the width of the metal band 3 in the pipe axis direction AD.

[0058]

[10] As in the above embodiment, although not particularly limited, the water leakage repair method may include the steps of arranging a plurality of metal bands 3 constituting a first unit 1 at intervals in the circumferential direction CD of the fluid pipe K and temporarily fastening the circumferential ends of the plurality of metal bands 3 constituting the first unit 1 together with a fastening mechanism 4, arranging a plurality of metal bands 3 constituting a second unit 2 at intervals in the circumferential direction CD of the fluid pipe K and temporarily fastening the circumferential ends of the plurality of metal bands 3 constituting the second unit 2 together with a fastening mechanism 4, positioning a first metal band 3′ included in the first unit 1 and a second metal band 3″ included in the second unit 2 adjacent to the first unit 1 in a position covering a first waterstop sheet 6 formed of an elastic body for covering the water leakage portion K1, and finally fastening the fastening mechanisms 4 of the first unit 1 and the second unit 2.

[0059]

[11] In the water leak repair method described in

[10] above, the positioning may be performed using a jig 8 that clamps the first metal band 3' and the second metal band 3'' from both sides in the pipe axis direction AD, and the final tightening may be performed while maintaining the positioning by the jig 8. This allows the water leak repair fittings to be properly attached.

[0060] In the water leak repair fittings described in any of [1] to [9] above, the portions of the first metal band 3′ and the second metal band 3″ that press against the first water stop sheet 6 may be plate-shaped portions with a constant thickness, and the plate-shaped portions may enable the first metal band 3′ and the second metal band 3″ to be bent along the outer peripheral surface K2 of the fluid pipe K.

[0061] Although the embodiments of the present disclosure have been described above with reference to the drawings, the specific configurations should not be considered to be limited to these embodiments. The scope of the present disclosure is defined not only by the description of the above embodiments but also by the claims, and further includes all modifications within the meaning and scope of the claims.

[0062] The structures employed in the above-described embodiments can be employed in any other embodiment. The specific configurations of the components are not limited to the above-described embodiments, and various modifications are possible within the scope of the present disclosure.

[0063] 1: First unit 2: Second unit 3: Metal band 3': First metal band 3'': Second metal band 4: Fastening mechanism 5: Second water stop sheet 6: First water stop sheet 8: Jig 33: Marking 64: First recess 66: Second recess 105, 205: Second water stop sheet 105P, 205P: Second uneven shape 106, 206: First water stop sheet 106P, 206P: First uneven shape AD: Pipe axis direction CD: Pipe circumferential direction K: Fluid pipe K1: Water leakage part K2: Outer circumferential surface RD: Pipe diameter direction W: Water leakage

Claims

1. A water leakage repair fitting to be attached to a leaking portion of a fluid pipe, comprising: a first unit having a plurality of metal bands spaced apart in the circumferential direction of the fluid pipe and a fastening mechanism for fastening circumferential ends of the plurality of metal bands together; a second unit arranged adjacent to the first unit, having a plurality of metal bands spaced apart in the circumferential direction of the fluid pipe and a fastening mechanism for fastening circumferential ends of the plurality of metal bands together; and a first water stop sheet made of an elastic body and extending in the axial direction of the pipe from the first metal band included in the first unit to a second metal band included in the second unit, wherein the circumferential length of the first water stop sheet is smaller than the circumferential lengths of the first metal bands and the second metal band, and the first water stop sheet is pressed against the outer peripheral surface of the fluid pipe by the first metal band and the second metal band.

2. A water leak repair fitting as described in claim 1, wherein a second water stop sheet is provided on the inner peripheral surface of each of the plurality of metal bands constituting the first unit and the second unit.

3. A water leak repair fitting as described in claim 1 or 2, in which a metal plate is provided on the outer peripheral surface of the first water stop sheet.

4. A water leakage repair fitting as described in claim 3, wherein the inner surface of the first water-stopping sheet has a plurality of first recesses, and the outer surface of the first water-stopping sheet on which the metal plate is provided has second recesses corresponding to at least some of the first recesses among the plurality of first recesses, and the second recesses are arranged only within an area that overlaps with the first recesses when projected parallel to the pipe diameter direction.

5. A water leak repair fitting as described in claim 1, wherein the first metal band and the second metal band have markings specifying the position at which the first water stop sheet is to be placed.

6. A water leak repair fitting as described in claim 2, wherein a first uneven shape is formed on the outer peripheral surface of the first water stop sheet, and a second uneven shape is formed on the inner peripheral surface of the second water stop sheet, and the first uneven shape and the second uneven shape fit together.

7. A water leak repair fitting as described in claim 6, wherein the first uneven shape extends from one end to the other end of the first water-stopping sheet in the pipe circumferential direction.

8. A water leakage repair fitting as described in claim 6, wherein a metal plate is provided on a portion of the outer peripheral surface of the first water-stopping sheet, and the first uneven shape extends from one end to the other end in the circumferential direction of the pipe in a portion of the outer peripheral surface of the first water-stopping sheet where the metal plate is not provided.

9. A water leak repair fitting as described in claim 1, wherein the length of the first water-stopping sheet in the pipe axial direction is greater than the width of each of the first metal band and the second metal band in the pipe axial direction.

10. A water leakage repair method for repairing a leaking portion of a fluid pipe, comprising the steps of: arranging a plurality of metal bands constituting a first unit at intervals in the circumferential direction of the fluid pipe and temporarily fastening circumferential ends of the plurality of metal bands constituting the first unit with a fastening mechanism; arranging a plurality of metal bands constituting a second unit at intervals in the circumferential direction of the fluid pipe and temporarily fastening circumferential ends of the plurality of metal bands constituting the second unit with a fastening mechanism; positioning a first metal band included in the first unit and a second metal band included in the second unit adjacent to the first unit in a position covering a first water-stopping sheet formed of an elastic body for covering the water leakage portion; and finally tightening the fastening mechanisms of the first unit and the second unit.

11. A water leakage repair method as described in claim 10, wherein the positioning is performed using a jig that clamps the first metal band and the second metal band from both sides in the pipe axial direction, and the final tightening is performed while maintaining the positioning by the jig.

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