Leak repair fittings

Abstract

To provide a water leakage repair metal fixture improved in cutoff performance.SOLUTION: A water leakage repair metal fixture 1 has a plurality of metal bands 3 arranged in a pipe circumferential direction CD of a fluid pipe 2 with intervals, cutoff sheets 5 arranged at internal peripheral faces 3a of the plurality of metal bands 3, formed of elastic bodies, and sealing a clearance between the metal bands 3 and an external peripheral face 2b of the fluid pipe 2, and a fastening mechanism 4 for fastening end parts of the plurality of metal bands 3 in the pipe circumferential direction. An internal peripheral face 5a of the cutoff sheet 5 has a plurality of first ribs 51 extending in the pipe circumferential direction CD, a plurality of second ribs 52 extending in a pipe axis direction AD, and a plurality of first recessed parts 54. The plurality of first recessed parts 54 are formed while being blocked by the plurality of first ribs 51 and the plurality of second ribs 52. An outer end 53e of the outermost rib 53 located at the outermost outside AD1 in the pipe axis direction out of the plurality of first ribs 51 is located at the inside AD2 in the pipe axis direction rather than outer ends 3e of the metal bands 3 in the pipe axis direction.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a water leak repair fitting for a fluid pipe such as a water pipe. [Background technology]

[0002] Fluid pipes (such as water pipes) installed outdoors, such as in water pipe bridges, may leak due to corrosion of the pipes. A device for repairing fluid pipes under leaking conditions is known (see, for example, Patent Document 1).

[0003] The repair device disclosed in Patent Document 1 includes a metal band that is wrapped around the leaking portion of a 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] Such devices are likely to exhibit watertight performance if they can stop the leak at the center of the metal band in the axial direction of the fluid pipe. However, depending on the location of the leak in the water pipe, interference between the metal band and the surrounding structure can result in situations where the leak can only be stopped at the end of the metal band in the axial direction of the pipe. In this case, the watertight performance may not be fully achieved. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-19388 Summary of the Invention [Problem to be solved by the invention]

[0006] The present disclosure provides a water leak repair fitting with improved water stopping performance. [Means for solving the problem]

[0007] The water leak repair fitting disclosed herein is a water leak repair fitting that is attached to a leaking portion of a fluid pipe, and comprises: a plurality of metal bands spaced apart in the circumferential direction of the fluid pipe; a water stop sheet formed of an elastic material and attached to the inner surface of each of the plurality of metal bands to seal the space between the metal band and the outer surface of the fluid pipe; and a fastening mechanism that fastens the circumferential ends of the plurality of metal bands together, wherein the inner surface of the water stop sheet has a plurality of first ribs extending in the circumferential direction of the pipe, a plurality of second ribs extending in the axial direction of the pipe, and a plurality of first recesses, each of the plurality of first recesses being formed by being closed by the plurality of first ribs and the plurality of second ribs, and the outer end of the outermost rib of the plurality of first ribs, which is located furthest outward in the axial direction of the pipe, is located more inward in the axial direction than the outer end of the metal band. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a water leakage repair fitting attached to a fluid pipe according to a first embodiment of the present disclosure. [Figure 2] Cross-sectional view of the II-II portion in Figure 1. [Figure 3] 10 is a side view showing the metal band and the waterstop sheet integrated with the metal band before being attached to the fluid pipe. FIG. [Figure 4A] FIG. [Figure 4B] FIG. [Figure 5A] A view of the waterproof sheet from the inner surface side (inside the pipe diameter direction). [Figure 5B] Cross-sectional view of the VV region in Figure 5A. [Figure 6] A diagram showing the assembly process for water leak repair fittings. [Figure 7] 4A and 4B are partial plan and cross-sectional views showing a compression process of the waterstop sheet in the assembly process. [Figure 8A] 3A and 3B are a plan view and a partially exploded cross-sectional view showing a fastening mechanism. [Figure 8B] FIG. [Figure 9] 1A to 1C are a plan view, a left side view, a right side view, and a front view showing a rotation axis. [Figure 10] 4A and 4B are side views showing a rotation shaft in a first rotational position and a second rotational position. [Figure 11] 10A and 10B are plan and front views showing a rotation shaft of a modified example. [Figure 12] 10A and 10B are side views showing a rotation shaft in a first rotational position and a second rotational position of a modified example. [Figure 13] 10A and 10B are a partially cutaway cross-sectional view and a right side view showing a rotating shaft and a fastening mechanism according to a modified example. [Figure 14] 10A and 10B are a plan view and a side view showing a fastening mechanism of a modified example. [Figure 15A] FIG. 10 is a plan view showing a pressing mechanism according to a modified example. [Figure 15B] Cross-sectional view of the XV-XV portion of Figure 15A. [Figure 16] FIG. 10 is a cross-sectional view of a modified water stop sheet. [Figure 17] 17 is a cross-sectional view showing the metal band and the waterstop sheet in the fastened state of the modified example shown in FIG. 16. [Figure 18] Cross-section of new challenges. [Figure 19] 10A and 10B are a partial plan view and a cross-sectional view showing a modified water stop sheet and a metal band. [Figure 20] 10A and 10B are a partial plan view and a cross-sectional view showing a modified water stop sheet and a metal band. [Figure 21] 10A and 10B are a partial plan view and a cross-sectional view showing a modified water stop sheet and a metal band. [Figure 22] FIG. 10 is a plan view showing the state in which the metal band, the water blocking sheet, and the fastening mechanism of the second embodiment are assembled. [Figure 23] FIG. 10 is a side view showing the state in which the metal band, the water blocking sheet, and the fastening mechanism of the second embodiment are assembled. [Figure 24] 24A to 24C are a plan view, a left side view, a right side view, and a cross-sectional view of the A24-A24 portion in FIG. 24 showing a rotation shaft of a second embodiment. [Figure 25] A diagram showing the assembly process for water leak repair fittings. [Figure 26] A diagram showing the assembly process for water leak repair fittings. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment The water leakage repair fitting and repair method according to the first embodiment of the present disclosure will be described below with reference to the drawings. In Fig. 3, hatching is used to make components easier to distinguish. Fig. 5A also shows an enlarged view of one portion.

[0010] As shown in Figures 1 and 2, a water leak repair fitting 1 is attached to a leaking portion 2x of a fluid pipe 2 such as a water pipe. The water leak repair fitting 1 has multiple metal bands 3, a fastening mechanism 4, and a water stop sheet 5. The term "fitting" in the water leak repair fitting indicates that the multiple metal bands are made of metal, and does not mean that other components, such as the water stop sheet, are limited to being made of metal.

[0011] The plurality of metal bands 3 are provided at intervals in the circumferential direction CD of the fluid pipe 2. Details will be described later.

[0012] The fastening mechanism 4 fastens together the circumferential ends of the plurality of metal bands 3. The fastening mechanism 4 includes bolts and nuts, and will be described in detail later.

[0013] The waterstop sheet 5 is made of an elastic material such as rubber. As shown in FIGS. 2 and 3, the waterstop sheet 5 is provided on the inner circumferential surface 3a of each of the multiple metal bands 3. In this embodiment, the waterstop sheet 5 is attached to the inner circumferential surface 3a 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, whereby the waterstop sheet 5 is pressed against the outer circumferential surface 2b of the fluid pipe 2. As a result, the waterstop sheet 5 seals the gap between the metal band 3 and the outer circumferential surface 2b of the fluid pipe 2, preventing water leakage from the fluid pipe 2.

[0014] As shown in Fig. 3, both ends 5c, 5d of the waterstop sheet 5 in the pipe circumferential direction CD are tapered. This allows the first waterstop sheet 5 and the second waterstop sheet 5 to be adjacent in the pipe circumferential direction CD, and the pipe circumferential direction end 5d of the first waterstop sheet 5 and the pipe circumferential direction end 5c of the second waterstop sheet 5 to overlap, thereby preventing the thickness of the waterstop sheet 5 from varying like a step. As a result, the outer circumferential surface of the fluid pipe 2 can be pressed as uniformly as possible.

[0015] As shown in Figures 3 and 8B, a metal plate 32 is disposed on the outer circumferential side (outer side RD1 in the pipe radial direction) of the waterstop sheet 5 between adjacent metal bands 3 in the pipe circumferential direction CD. The metal plate 32 is fitted into and adhered to a corresponding recess in the waterstop sheet 5. The metal plate 32 is provided to hold the waterstop sheet 5 between the metal bands 3. The metal plate 32 preferably overlaps a line L3 connecting the rotation axis C1 of the rotating shaft 40 to the center of the fluid pipe. This allows the tightening force applied by the fastening mechanism 4 to be appropriately transmitted to the waterstop sheet 5, improving the sealing effect. It is preferable that the end of the metal plate 32 in the pipe circumferential direction CD does not reach the first portion P11. If the metal plate 32 reaches the first portion P11, the metal will become thicker, which would disrupt the overall pressure balance. The length of the metal plate 32 in the pipe circumferential direction CD may be three or more times the diameter of the rotating shaft 40.

[0016] As shown in FIGS. 5A and 5B , the inner peripheral surface 5a of the waterstop sheet 5 has a plurality of first ribs 51 extending in the pipe circumferential direction CD, a plurality of second ribs 52 extending in the pipe axial direction AD, and a plurality of first recesses 54. The first ribs 51 and the second ribs 52 protrude further toward the inside RD2 in the pipe radial direction than the bottoms 54s of the first recesses 54. The first recesses 54 are closed by the plurality of first ribs 51 and the plurality of second ribs 52. The plurality of first ribs 51 and the plurality of second ribs 52 form a mesh. Each cell constituting the mesh corresponds to one first recess 54. In this embodiment, the shape of the first recesses 54 when viewed from the inside RD2 in the pipe radial direction is rectangular (square), and when viewed three-dimensionally, the first recesses 54 are rectangular parallelepipeds. However, the shape is not limited to this. For example, the first recesses 54 may be rhombic, circular, or elliptical.

[0017] 5A and 7, the multiple first ribs 51 include an outermost rib 53 located at the outermost side AD1 in the tube axis direction. The outer end 53e of the outermost rib 53 in the tube axis direction is located at an inner side AD2 in the tube axis direction than the outer end 3e of the metal band 3 in the tube axis direction. To withstand water pressure, it is preferable that the dimension D1 in the tube axis direction of the first rib 51 and the outermost rib 53 is 1 mm or more. In this embodiment, D1 is 2.5 mm, but is not limited to this value.

[0018] Furthermore, when the outermost rib 53 tries to deform outward in the pipe axis direction AD1 due to water pressure, in order to ensure that the deformed outermost rib 53 does not protrude from the waterstop sheet 5, it is preferable that the outer end 53e of the outermost rib 53 be located more inward in the pipe axis direction AD2 than the outer end 5e of the waterstop sheet 5. It is preferable that the dimension D3 in the pipe axis direction from the outer end 53e of the outermost rib 53 to the outer end 5e of the waterstop sheet 5 be at least half the dimension D1 of the outermost rib 53 in the pipe axis direction.

[0019] 5B and 7, minute protrusions 55 having a width D2 and a protrusion height of 0.75 mm or less are formed on the inner peripheral surfaces of the first rib (including the outermost rib 53) and the second rib 52, but the minute protrusions 55 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 55. 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.

[0020] As shown in FIGS. 5B and 7 , second recesses 56 corresponding to at least some of the first recesses 54 are formed on the outer surface 5b of the waterstop sheet 5. The second recesses 56 are located only within a range Ar1 that overlaps with the first recesses 54 when projected parallel to the pipe radial direction RD. If the second recesses 56 were located outside the range Ar1, the first ribs 51 or the second ribs 52 would not have a strong foothold, preventing them from properly pressing against the outer surface 2b of the fluid pipe 2. In this embodiment, the second recesses 56 are circular when viewed parallel to the pipe radial direction RD and cylindrical when viewed three-dimensionally. However, the shape is not limited to a circle. For example, the second recesses 56 may be rectangular, similar to the first recesses 54, when viewed parallel to the pipe radial direction RD.

[0021] As shown in Fig. 3, the waterstop sheet 5 has tapered end portions 5c, 5d on both sides in the pipe circumferential direction CD, and an intermediate portion 5f located between the tapered end portions 5c, 5d. Although not particularly limited, in this embodiment, the thickness of the intermediate portion 5f is 6.0 mm to 6.5 mm. To ensure waterstop performance, the thickness is preferably 4 mm or more and 8 mm or less. If the thickness is less than 4 mm, the waterstop performance will be insufficient, and if the thickness exceeds 8 mm, the waterstop sheet 5 will have difficulty conforming to the outer circumferential surface of the pipe and will not be compressed appropriately, which may actually reduce the waterstop performance.

[0022] The assembly process (repair method) for the water leak repair fitting 1 will now be briefly described. First, as shown in the upper part of Fig. 6 and the upper part of Fig. 7, in a situation where water leakage W is occurring from the water leakage part 2x of the fluid pipe 2, the metal band 3 and the water stop sheet 5 are placed on the outer side RD1 in the pipe diameter direction of the fluid pipe 2. The metal band 3 and the water stop sheet 5 are placed at a position shifted in the pipe axis direction AD from the water leakage part 2x so that they are not subjected to the water pressure of the water gushing out from the water leakage part 2x. Next, the ends of adjacent metal bands 3 are temporarily fastened together by the fastening mechanism 4 (temporarily fastening bolts and nuts). Next, as shown in the lower part of Fig. 6 and the center part of Fig. 7, after the temporary fastening by the fastening mechanism 4 is completed, the metal band 3 and the waterstop sheet 5 are shifted in the pipe axis direction AD to a position that covers the water-leaking portion 2x. At this time, the first recess 54, which is blocked by the outer peripheral surface 2b of the fluid pipe 2, is filled with water. In Fig. 7, the water is schematically shown by diagonal lines. Next, as shown in the lower part of Figure 7, the fastening mechanism 4 is fastened to reduce the diameter between the multiple metal bands 3, and the waterstop sheet 5 is pressed and compressed against the outer peripheral surface 2b of the fluid pipe 2. The rubber hardness of the waterstop sheet 5 is preferably 60 degrees or more and 80 degrees or less. When the rubber hardness of the waterstop sheet 5 is 60 degrees, the compression amount is preferably 1.0 mm or more and 1.6 mm or less along the pipe radial direction RD. When the rubber hardness of the waterstop sheet 5 is 60 degrees, if the compression amount is less than 1.0 mm, water leakage will occur and the waterstop effect will not be achieved. If the compression amount exceeds 1.6 mm, the waterstop sheet 5 will be too crushed and the waterstop effect will not be improved. When the rubber hardness of the waterstop sheet 5 is 80 degrees, the compression amount is preferably 0.5 mm or more and 1.0 mm or less along the pipe radial direction RD. When the waterstop sheet 5 has a rubber hardness of 80 degrees, if the compression amount is less than 0.5 mm, water leakage occurs and the waterstop effect is not achieved. If the compression amount exceeds 1.0 mm, the waterstop sheet 5 is crushed too much and the waterstop effect is not improved. The rubber hardness referred to in this specification is the hardness measured using a JIS K7312 type C tester at 23°C. Water is an incompressible fluid. When each first recess 54 is filled with water, the first rib 51 and the second rib 52 of the waterstop sheet 5 provide resistance to compression. Because the second recess 56 is located on the outer periphery of the first recess 54 (on the outer side RD1 in the pipe diameter direction), when the waterstop sheet 5 is compressed, the region P1 of the waterstop sheet 5 between the first recess 54 and the second recess 56 deforms toward the outer side RD1 in the pipe diameter direction. This allows the first recess 54 to be compressed while maintaining a constant volume, thereby preventing water leakage even when the first recess 54 is filled with water.

[0023] 5B and the upper part of FIG. 7, in a natural state (uncompressed state) in which no external force is acting on the waterstop sheet 5, the volume of each second recess (56) is preferably equal to or greater than the amount of volume change that occurs when each first recess 54 is compressed 1 mm in the pipe radial direction RD. More preferably, the volume of each second recess (56) is equal to or greater than the amount of volume change that occurs when each first recess 54 is compressed 1.5 mm in the pipe radial direction RD. The amount of volume change can be approximately calculated by multiplying the bottom area of ​​the first recess 54 by the amount of compression (1 mm to 1.5 mm).

[0024] As shown in FIGS. 3 , 4A , and 4B , the metal band 3 has annular portions 30 at both ends in the pipe circumferential direction CD. The annular portions 30 are 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 band 3 is 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 portions of the metal sheet tips 31 tend to float toward the outer side RD1 in the pipe radial direction. When the welded metal sheet tips 31 face the inner side RD2 in the pipe radial direction, the thicker portions of the tips 31 more easily press against the watertight rubber on the inner side RD2 in the pipe radial direction than when they face the outer side RD1 in the pipe radial direction. As shown in FIG. 4B , the annular portion 30 has multiple pairs of openings 30s for inserting bolts and nuts. The openings 30s face the outer side RD1 in the pipe radial direction 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 appropriately depending on the dimension of the metal band 3 in the tube axis direction AD.

[0025] The metal band 3 is made of metal. In this embodiment, stainless steel is used for the metal band 3. Although not particularly limited, in the case of stainless steel, 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 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 2.

[0026] 8A, 8B, and 9, the fastening mechanism 4 includes a rotating shaft 40 that is inserted into the annular portion 30 and is 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 around the rotation axis C1 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 2 with different diameters and the outer surface of the fluid pipe 2 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, and the metal band 3 can press the waterstop sheet 5 uniformly over the entire circumferential direction CD of the pipe. The bolt 41 is inserted into a bolt insertion hole 40s formed in the rotating shaft 40. The inner surface of the bolt insertion hole 40s is flat and does not have a thread groove. The inner diameter of the bolt insertion hole 40s is larger than the outer diameter of the bolt 41.

[0027] As shown in FIGS. 9 and 10 , the rotating shaft 40 is formed in a rod shape. The rotating shaft 40 has a protrusion 40t that interferes with the metal band 3 to prevent the rotating shaft 40 from falling off the annular portion 30. The protrusion 40t protrudes radially outward from the outer peripheral surface 40b of the rotating shaft 40. In the embodiment shown in the figures, the protrusion 40t protrudes from the outer peripheral surface 40b of the rotating shaft 40, but this is not limiting. As shown in the upper part of FIG. 10 , in a first rotational position where the rotating shafts 40 are fastened together with bolts 41 and nuts 42, the protrusion 40t interferes with the metal band 3 to prevent the metal band 3 from falling off. As shown in the lower part of FIG. 10 , in a second rotational position different from the first rotational position, the protrusion 40t does not interfere with the metal band 3 and allows the rotating shaft 40 to be removed from the annular portion 30.

[0028] As shown in FIGS. 6, 8A, and 8B, a spacer 43 may be attached to the bolt 41. The spacer 43 protrudes radially outward from the bolt shank 41x beyond the rotation shaft 40. Specifically, the spacer 43 has a flange 43c, which protrudes radially outward from the bolt shank 41x beyond the rotation shaft 40. As a result, when the spacer 43 comes into contact with the metal band 3, a space SP1 is formed between the nut 42 and the metal band 3, in which a tool K for fastening the nut 42 can be placed. The outer diameter of the maximum diameter portion (flange 43c) of the spacer 43 is only required to be larger than the outer diameter of the tool K. The spacer 43 may be provided to move the fastening position of the nut 42 away from the rotation shaft 40. By moving the nut 42 away from the rotation shaft 40, the gap between the nut 42 and the metal band 3 can be increased, making it easier to ensure a tool allowance in which the tool K can be placed.

[0029] As shown in FIGS. 8A and 9 , the bolt 41 is a headed bolt having a head 41a at a first end, a threaded groove formed at a second end 41b, and a nut 42 attached to the second end 41b. Of the pair of rotating shafts 40, 40, the rotating shaft 40 on the head 41a side has a rotation restriction groove 41c that engages with the head 41a to restrict rotation of the bolt 41. The rotation restriction groove 41c is a receiving groove that at least partially receives the head 41a of the bolt 41. Of course, the rotation restriction groove 41c may completely receive the head 41a, or it may be a groove that does not receive the head 41a. In this embodiment, the head 41a of the bolt 41 is hexagonal, and the rotation restriction groove 41c is a correspondingly hexagonal recessed groove. However, the shapes of the head and the rotation restriction groove can be modified as appropriate. For example, the head 41a may be a T-shaped head.

[0030] 8A and 9, when preventing the head 41a of the bolt 41 from rotating, or when preventing the nut on the first end of a double-threaded bolt from rotating, it is preferable to provide a retaining member 44 for preventing the bolt 41 from coming off at a position opposite the head 41a or nut that is prevented from rotating, across the rotation shaft 40. The retaining member 44 may be a nut, or may be an elastic ring such as a rubber or resin O-ring that is inserted into the bolt insertion hole 40s.

[0031] As shown in FIG. 4B , the length L1 of the metal band 3 along the pipe circumferential direction CD can be changed as needed. In situations where fluid pipes 2 have various diameter sizes, designing metal bands 3 to fit each diameter size would require a large inventory of different types of metal bands 3. For example, there are seven types of fluid pipes 2 that need repair with inner diameters ranging from 300 mm to 700 mm. Examples of these seven types include 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 600 mm, and 700 mm. To accommodate these, it is sufficient to have two or three of the three types of metal bands 3 with lengths L1 along the pipe circumferential direction CD of 250 mm, 400 mm, and 600 mm. This allows three types of metal bands 3 to be stocked to accommodate seven types of fluid pipes, enabling rapid response to leaks and reducing inventory costs. Specifically, to accommodate a fluid pipe with an inner diameter of 300 mm, the outer diameter of the pipe is 318.5 mm, so one metal band with L1=400 mm and one metal band with L1=600 mm are required. To accommodate a fluid pipe with an inner diameter of 350 mm, two metal bands with L1=250 mm and one metal band with L1=600 mm are required since the outer diameter of the pipe is 355.6 mm. To accommodate a fluid pipe with an inner diameter of 400 mm, the outer diameter of the pipe is 406.7 mm, so one metal band with L1 = 250 mm, one metal band with L1 = 400 mm, and one metal band with L1 = 600 mm are required. To accommodate a fluid pipe with an inner diameter of 450 mm, two metal bands with L1=400 mm and one metal band with L1=600 mm are required since the outer diameter of the pipe is 457.2 mm. To accommodate a fluid pipe with an inner diameter of 500 mm, one metal band with L1 = 400 mm and two metal bands with L1 = 600 mm are required since the outer diameter of the pipe is 508.0 mm. To accommodate a fluid pipe with an inner diameter of 600 mm, the outer diameter of the pipe is 609.6 mm, so one metal band with L1 = 250 mm, one metal band with L1 = 400 mm, and two metal bands with L1 = 600 mm are required. To accommodate a fluid pipe with an inner diameter of 700 mm, the outer diameter of the pipe is 711.2 mm, so one metal band with L1=400 mm and three metal bands with L1=600 mm are required.

[0032] <Modification> (1) In the embodiment shown in Figures 9 and 10, the protrusion 40t protrudes from the outer peripheral surface 40b of the cylindrical portion of the rotating shaft 40, but this is not limiting. For example, as shown in Figures 11 and 12, the protrusion 140t may protrude radially outward from the axial end of the rotating shaft 140.

[0033] (2) A configuration as shown in FIG. 13 may also be used. As shown in FIG. 13, the first rotating shaft 240 on the head 41a side has a head accommodating groove 241c in which the head 41a is at least partially embedded so as to be rotatable relative to the annular portion 30. The head accommodating groove 241c restricts rotation of the head 41a, similar to the rotation restricting groove 41c. The second rotating shaft 340 on the nut 42 side has an open groove 340c that receives the shaft of the bolt 41 from the radially outer side of the second rotating shaft 340 as the first rotating shaft 240 rotates. The open groove 340c is open to the radially outer side of the second rotating shaft 340 and in the axial direction. A retaining washer 45 is attached between the second rotating shaft 340 and the nut 42 to engage with the second rotating shaft 340 and restrict the shaft of the bolt 41 from coming out of the open groove 340c. The retaining washer 45 has an insertion hole for inserting the shaft of the bolt 41, and an engaging piece 45a at an end thereof facing the inner side RD2 in the pipe diameter direction of the fluid pipe 2, which is bent to engage with the second rotating shaft 340. The engaging piece 45a is disposed at a position where it interferes with the second rotating shaft 340 on the inner side RD2 in the pipe diameter direction of the second rotating shaft 340 in the fastened state.

[0034] (3) As shown in FIG. 14, a rotation-restricting washer 141 may be provided instead of the rotation-restricting groove 41c shown in FIG. 9. That is, the rotating shaft 440 is configured to be rotatable around the rotation axis C1 within the annular portion 30 of the metal band 3. Between the head 41a of the bolt 41 and the rotating shaft 440, the rotation-restricting washer 141 is attached. The rotation-restricting washer 141 engages with the head 41a and the rotating shaft 440 to restrict rotation of the bolt 41. The rotation-restricting washer 141 has an insertion hole 141h through which the bolt 41 passes, a clamping piece 141a that clamps the head 41a, and an interference piece 141b that interferes with the outer peripheral surface of the rotating shaft 440. This configuration also allows the rotation-restricting washer 141 to restrict the rotation of the bolt 41, so that the bolt 41 can be fastened by turning only the nut 42, improving workability. Compared to the embodiment shown in FIG. 9, there is no need to form a rotation-restricting groove 41c in the rotating shaft 440, improving convenience. 14, if the size of the fluid pipe 2 is small (for example, a diameter of 300 mm), the spacer 43 shown in FIG. 9 is not necessary, and a rotation restricting washer 141 can be used directly on the rotation shaft 440. Also, the angle can be adjusted as shown by arrow Y1 in FIG. 14 according to the curvature of the pipe size, and pipes of any size can be tightened uniformly by the fastening mechanism 4 without applying localized stress to the metal band 3.

[0035] (4) In the above embodiment, as shown in FIG. 3 , the metal band 3 has a first portion P11 to which the tip 31 of the metal sheet is welded, and a second portion P12 located more inward in the pipe circumferential direction CD than the first portion P11. The first portion P11 tends to float toward the outer side RD1 in the pipe radial direction, thereby weakening the force that presses down on the waterstop sheet 5. Therefore, the thickness of the portion of the waterstop sheet 5 that contacts the first portion P11 may be greater than the thickness of the portion of the waterstop sheet 5 that contacts the second portion P12. In this way, even if the first portion P11 floats above the second portion P12, the different thicknesses of the waterstop sheet 5 make it possible to adjust the compressive force and ensure that the waterstop sheet 5 uniformly presses down on the fluid pipe 2.

[0036] (5) As shown in FIGS. 15A and 15B , a pressing mechanism 6 may be provided between adjacent metal bands 3 in the pipe circumferential direction CD, using the shafts of bolts 41 as a foothold to press the metal plate 32. The pressing mechanism 6 of this embodiment includes wedge members 60 that press the metal plate 32 and fixing bolts 61 that move the wedge members 60 in the closing direction and fix the position. By turning the fixing bolts 61 to separate the wedge members 60, the wedge members 60 enter between the bolts 41 and the metal plate 32 and press the metal plate 32. Of course, the pressing mechanism 6 is not limited to a wedge type. For example, pressing may be performed by bolts without using wedge members.

[0037] (6) In the first embodiment, the water stop sheet 5 is fixed to the metal band 3 by adhesive, but this is not limitative, and the water stop sheet 5 does not have to be fixed to the metal band 3.

[0038] (7) The annular portion 30 of the metal band 3 is formed by bending and welding a metal plate, but may be formed by other methods.

[0039] (8) The welded tip 31 of the metal plate may be disposed in a position facing the outer side RD1 in the pipe radial direction.

[0040] (9) As shown in Figure 16, the outer end 53e of the waterstop sheet 5 and the outer end 53e of the outermost rib 53 may be in the same position as long as the outer end 53e of the waterstop sheet 5 is located in the pipe axial direction inward AD2 of the outer end 3e of the metal band 3. This makes it possible to suppress deformation of the outermost rib 53 by the metal band 3 when the outer end 53e of the waterstop sheet 5 is deforming in the pipe axial direction outward AD1 due to water pressure.

[0041] (10) In the above embodiment, the bolt 41 is a headed bolt, but is not limited to this. For example, it may be a double-threaded bolt.

[0042] (11) In the above embodiment, the inner surface of the bolt insertion hole 40s formed in the rotating shaft 40 is a flat surface without a thread groove, but this is not limited to this. When a double-threaded bolt is used, a thread groove may be formed on the inner surface of the bolt insertion hole 40s so that the first end of the double-threaded bolt is screwed in place.

[0043] (12) Fig. 17 is a cross-sectional view showing a metal band and a waterstop sheet in a fastened state according to a modified example. As shown in Fig. 17, when the metal bands 3 are fastened by the fastening mechanism 4, the outer ends 3e of the metal bands 3 may be bent toward the inner side RD2 in the pipe diameter direction of the fluid pipe 2 relative to the central portions 3c in the pipe axis direction. With this configuration, the outer ends 5e of the waterstop sheet 5 in the pipe axis direction can be compressed more strongly than other portions, thereby improving the watertight performance of the outer ends 5e of the waterstop sheet 5 in the pipe axis direction. This bending deformation can be generated by fastening the fastening mechanism 4 because the outer ends 53e of the outermost ribs 53 in the pipe axis direction are located inward AD2 relative to the outer ends 3e of the metal bands 3 in the pipe axis direction. The configuration in which the outer end 3e of the metal band 3 in the pipe axis direction is bent toward the inside RD2 in the pipe radial direction can also be adopted in a configuration shown in Fig. 7 in which the outer end 3e of the metal band 3 in the pipe axis direction and the outer end 5e of the waterstop sheet 5 in the pipe axis direction are flush with each other and the outer end 53e of the outermost rib 53 in the pipe axis direction is located inward AD2 in the pipe axis direction than the outer end 3e of the metal band 3. In addition, the configuration in which the outer end 3e of the metal band 3 in the pipe axis direction is bent toward the inside RD2 in the pipe radial direction can also be adopted in a configuration shown in Fig. 16 in which the outer end 5e of the waterstop sheet 5 in the pipe axis direction and the outer end 53e of the outermost rib 53 in the pipe axis direction are flush with each other.

[0044] (13) In the configuration shown in Figure 7, when the rubber hardness of the water-stop sheet 5 is 50 degrees and a second recess 56 is formed behind the first recess 54 located at the outermost end AD1 in the pipe axial direction, it was found that, as shown in Figure 18, the rubber of the water-stop sheet 5 is easily deformed by the second recess 56, and the water-stop sheet 5 may be pushed out from the outer end 3e of the metal band 3 in the pipe axial direction by water pressure, resulting in the second recess 56 having an adverse effect.

[0045] (14) A first configuration for suppressing or preventing the occurrence of the defects described in (13) and (14) is, as shown in FIG. 19, that the pipe axial outer end 3e of the metal band 3 protrudes further toward the pipe axial outer side AD1 than the pipe axial outer end 5e of the waterstop sheet 5. A second recess 56 is formed corresponding to the pipe radial outer side RD1 of the first recess 54 located furthest outward in the pipe axial direction AD1 among the multiple first recesses 54, and fixes the pipe axial outer end 35x of the metal band 3 to the waterstop sheet 5. Fixation can be performed by adhesive bonding or lining fixation. The rubber hardness of the waterstop sheet 5 is set to be 60 degrees or more and 80 degrees or less. The pipe axial outer end 53e of the outermost rib 53 may be flush with the pipe axial outer end 5e of the waterstop sheet 5, or the pipe axial outer end 53e of the outermost rib 53 may be located in the pipe axial inner side AD2 than the pipe axial outer end 5e of the waterstop sheet 5. This configuration makes it possible to prevent the second recess 56 from having an adverse effect and improve the water-stopping performance.

[0046] (15) A second configuration for suppressing or preventing the occurrence of the defects described in (13) and (14) is shown in FIG. 20. The outer end 3e of the metal band 3 in the axial direction protrudes further toward the outer side AD1 in the axial direction than the outer end 5e of the waterstop sheet 5 in the axial direction. A second recess 56 is formed corresponding to the outer side RD1 in the axial direction of the first recess 54 located furthest outward in the axial direction among the multiple first recesses 54, and fixes the outer end 35x of the waterstop sheet 5 and the metal band 3 in the axial direction. Fixation can be achieved by adhesive bonding or lining. The waterstop sheet 5 has a hybrid structure in which the hardness of the end region Ar2 on the outer side AD1 in the axial direction is higher than the hardness of the inner region Ar3 on the inner side AD2 in the axial direction than the end region Ar2. The interface Br1 between the end region Ar2 and the inner region Ar3 is located at a position overlapping the second first rib 51 from the outer side AD1 in the axial direction or at a position on the inner side AD2 in the axial direction of the second first rib 51 in the axial direction. For example, the interface Br1 may be disposed between the second and third first ribs 51 from the outer side AD1 in the tube axial direction. For example, the rubber hardness of the waterstop sheet 5 in the end region Ar2 may be higher than the rubber hardness of the waterstop sheet 5 in the inner region Ar3. The rubber hardness of the inner region Ar3 may be 50 degrees, and the rubber hardness of the end region Ar2 may be 60 degrees or more and 80 degrees or less. Alternatively, the rubber hardness of the inner region Ar3 may be 60 degrees, and the rubber hardness of the end region Ar2 may be more than 60 degrees and 80 degrees or less. For example, if the rubber hardness of the waterstop sheet 5 in the end region Ar2 is the same as that in the inner region Ar3, a reinforcing layer such as a reinforcing cloth or reinforcing fiber may be provided on the waterstop sheet 5 in the end region Ar2, while no reinforcing layer is provided in the inner region Ar3. The outer end 53e of the outermost rib 53 in the pipe axis direction may be flush with the outer end 5e of the waterstop sheet 5 in the pipe axis direction, or the outer end 53e of the outermost rib 53 in the pipe axis direction may be positioned more inward AD2 than the outer end 5e of the waterstop sheet 5 in the pipe axis direction. According to this configuration, the region AD1 further outward in the axial direction than the second first rib 51 always becomes the end region Ar2, which has high hardness, and it is possible to prevent the second recess 56 from having an adverse effect and improve the water-stopping performance.

[0047] (16) A third configuration for suppressing or preventing the occurrence of the defects described in (13) is, as shown in FIG. 21, to have the pipe axial outer end 3e of the metal band 3 protrude further toward the pipe axial direction outer side AD1 than the pipe axial direction outer end 5e of the waterstop sheet 5. The waterstop sheet 5 and the pipe axial direction outer end 35x of the metal band 3 are fixed. Fixing can be done by adhesive bonding or lining fixation. Of the multiple first recesses 54, the first recess 54 located furthest toward the pipe axial direction outer side AD1 does not have a corresponding second recess 56 formed on the pipe radial direction outer side RD1. This configuration makes it possible to avoid adverse effects of the second recess 56 and improve waterstop performance.

[0048] Second Embodiment A water leakage repair fitting and repair method according to a second embodiment of the present disclosure will be described below with reference to the drawings. The same parts as those in the first embodiment will be designated by the same reference numerals and will not be described again. Fig. 22 is a plan view showing the metal band 3, waterstop sheet 5, and fastening mechanism 4 of the second embodiment assembled together. Fig. 23 is a side view showing the metal band 3, waterstop sheet 5, and fastening mechanism 4 of the second embodiment assembled together. Fig. 24 is a plan view, left side view, right side view, and cross-sectional view of the A24-A24 portion showing the rotating shaft of the second embodiment. Figs. 22 and 23 show the water leak repair fittings at the time of sale.

[0049] As shown in FIGS. 22 to 24 , a fastening mechanism 4 is attached to the metal band 3. The fastening mechanism 4 includes a rotating shaft 540 inserted into the annular portion 30 of the metal band 3, a bolt 41 inserted into a bolt insertion hole 540s of the rotating shaft 540, and a nut 542 attached to the bolt 41. The bolt 41 is a bolt with a head 41a. The fastening mechanism 4 may further include a retaining member 544 and a spacer 543. The retaining member 544 of the second embodiment is a hexagonal nut, but is not limited to this. The retaining member 544 may be the same as that of the first embodiment or a modified version of the first embodiment. The spacer 43 of the second embodiment is a cylindrical spacer with a constant outer diameter and inner diameter, and has a clearance hole with an inner diameter larger than the outer diameter of the bolt 41. The nut 542 may have a flange 542a corresponding to the flange 43c of the spacer 43 of the first embodiment. The flange portion 542a may be a washer that is a separate member from the nut and the spacer.

[0050] As shown in Figure 23, the metal band 3 has a first portion P11 where the tip 31 of the metal sheet is welded. A waterstop sheet 5 is attached to the metal band 3. An end portion 5c on one side in the pipe circumferential direction CD of the waterstop sheet 5 is located closer to the tip in the pipe circumferential direction CD than the first portion P11 on one side in the pipe circumferential direction CD of the metal band 3. In addition, an end portion 5d on the other side in the pipe circumferential direction CD of the waterstop sheet 5 is located closer to the tip in the pipe circumferential direction CD than the first portion P11 on the other side in the pipe circumferential direction CD of the metal band 3. This makes it possible to reduce the amount by which the waterstop sheet 5 protrudes from the end portion in the pipe circumferential direction CD of the metal band 3 compared to the first embodiment.

[0051] 23 , when a perpendicular line L2 is drawn from the rotation axis C1 of the rotation shaft 540 to the inner surface of the annular portion 30 of the metal band 3 in the pipe diameter direction, a portion P13 of the waterstop sheet 5 that is located on the tip side in the pipe circumferential direction CD of the perpendicular line L2 may have a higher rubber hardness than a portion P14 of the waterstop sheet 5 that is located on the inside in the pipe circumferential direction CD of the perpendicular line L2. In the second embodiment, the rubber hardness of the portion P13 of the waterstop sheet 5 is 80 degrees, and the rubber hardness of the portion P14 of the waterstop sheet 5 is 60 degrees. If the rubber hardness of the entire waterstop sheet 5 is 60 degrees, an intermediate portion 5f of the waterstop sheet 5 between the first portions P11 can easily conform to the irregularities of the fluid pipe and form close contact therewith, which is preferable. However, when the water stop sheet 5 comes into contact with the fluid pipe, a force acts on the tip portion of the end 5d where there is no metal plate 32, causing the water stop sheet 5 to move toward the tip. If the rubber hardness is 60 degrees, the tip portion of the rubber where there is no metal plate 32 may become distorted, making it difficult to adhere to the pipe. On the other hand, if the rubber hardness of portion P13 is set to 80 degrees, the water stop sheet 5 will move more easily toward the tip, improving adhesion between the fluid pipe and the water stop sheet 5. The rubber hardness of the middle portion 5f is set to 60 degrees in consideration of its ability to conform to the fluid pipe. Regarding the rubber hardness of the portion P14, if the rubber hardness of the intermediate portion 5f between the first portions P11 and P11 is 60 degrees, the rubber hardness of the end portion 5c further forward than the first portion P11 may be 60 degrees, 80 degrees, or any hardness between 60 and 80 degrees. When the rubber hardness of the waterstop sheet 5 is made different between the end region Ar2 and the inner region Ar3 shown in FIG. 20, the relationship between the rubber hardness may be either [1] or [2] below. [1] Part P13 ≧ End region Ar2 of part P14 > Inner region Ar3 of part P14 [2] Area P13 = Area Ar2 at the edge of area P14 > Area Ar3 at the inner side of area P14

[0052] As shown in FIG. 24 , the rotating shaft 540 of the second embodiment may have a protrusion 540t protruding from the outer circumferential surface 40b. This prevents the rotating shaft 540 from falling off the annular portion 30 of the metal band 3. In the second embodiment, the protrusion 540t is located axially inward of both axial ends of the rotating shaft 540. This allows multiple metal bands 3 to be arranged adjacent to each other along the axial direction of the fluid pipe without any gaps. The function of preventing the protrusion 540t from falling off is the same as that shown in FIG. 10 . In the first rotational position, the protrusion 540t interferes with the annular portion 30 to prevent the rotating shaft 540 from falling off, and in the second rotational position, the interference between the protrusion 540t and the annular portion 30 is released, allowing the rotating shaft 540 to be attached and detached.

[0053] In the second embodiment, the protrusion 540t of the rotating shaft 540 may protrude from the outer peripheral surface 40b toward the tip (41b) side of the bolt 41 of the rotating shaft 540. With this, when the nut 542 is attached to the bolt 41, the weight of the nut and bolt 41 causes the outer peripheral surface 40b of the rotating shaft 540 on the tip side of the bolt 41 to come into close contact with the annular portion 30, making it easier to prevent the rotating shaft 540 from falling off.

[0054] As shown in FIG. 22, the protrusion 540t protrudes from the outer peripheral surface 40b of the rotating shaft 540 when the fastening mechanism 4 is fastened. The protrusion 540t is located more inward in the pipe circumferential direction CD than the outer end 30a of the metal band 3 in the pipe circumferential direction CD. As long as the protrusion 540t does not protrude from the outer end 30a of the metal band 3 in the pipe circumferential direction CD, the protrusion 540t and the outer end 30a may be flush with each other. This allows the rotating shaft 540 to be detachable from the metal band 3 when in the second rotational position, and prevents the rotating shaft 540 from falling off the metal band 3 when in the first rotational position. Even if the metal bands 3 come close enough to touch each other, the protrusions 540t do not come into direct contact with each other. As shown in FIG. 24, the rotating shaft 540 has a recess on the tip (41b) side of the bolt 41. The recess is formed by a surface 540a perpendicular to the bolt axis 41x and a surface 540b perpendicular to the axis of the rotating shaft 540 and the surface 540a. Protrusion 540t may be made of sheet metal and welded to surface 540b.

[0055] As shown in FIG. 22, the rotation shaft 540 has a rotation restriction groove 541c. The rotation restriction groove 541c has two surfaces that intersect both the rotation axis C1 of the rotation shaft 540 and a plane perpendicular to the rotation axis C1. The two surfaces are parallel to each other. The surfaces may be inclined at 60 degrees relative to the rotation axis C1 or at 30 degrees relative to a direction perpendicular to the rotation axis C1. This allows the hexagonal head 41a of the bolt 41 to be positioned within the diameter R1 of the rotation shaft 540, thereby enabling further reduction in the diameter R1 of the rotation shaft 540. Reducing the diameter R1 of the rotation shaft 540 shortens the distance between the bolt shank 41x (shown in FIG. 23) and the fluid pipe, enabling appropriate pressing. Note that if the distance between the bolt shank 41x and the fluid pipe were increased, a force would act on the first portion P11 to rise outward in the pipe radial direction, resulting in loss of force.

[0056] The water leak repair fittings of the first or second embodiment may be assembled as shown in FIG. 25. The example shown in FIG. 25 is a method (repair method) in which at least two metal bands 3 are assembled adjacent to each other along the pipe axis direction AD. This method is effective when there are many locations where water leaks W occur. As shown in the upper part of the figure, a first metal band 3 (left side in the figure) and a waterstop sheet 5 are placed on the fluid pipe 2 and fastened with the fastening mechanism 4. In the example shown in the figure, water leaks W are still occurring. Furthermore, a second metal band 3 (right side in the figure) and a waterstop sheet 5 are placed adjacent to the first metal band 3 and temporarily fastened with the fastening mechanism 4. A rubber string 7 is wound between the first metal band 3 and the second metal band 3, and the ends 7a of the rubber string 7 are bonded together with an adhesive to form an endless ring. In the example shown in FIG. 25, the cross section of the rubber string 7 is circular, but the shape can be modified in various ways. Next, the rubber strings 7 and the second metal band 3 are moved toward the first metal band 3, the rubber strings 7 are sandwiched between the first metal band 3 and the second metal band 3, compressing the rubber strings 7, and the second metal band 3 is fastened and fixed with the fastening mechanism 4. As shown in Figures 25 and 19, the outer ends of the first and second metal bands 3 in the pipe axis direction protrude outward in the pipe axis direction beyond the outer end of the waterstop sheet 5 in the pipe axis direction. As a result, the outer ends of the first and second metal bands 3 in the pipe axis direction hold the rubber strings 7, thereby improving water leakage prevention performance.

[0057] The water leak repair fitting of the first or second embodiment may be assembled as shown in FIG. 26 . The example shown in FIG. 26 is effective when a structure 20 extending in the radial direction of the fluid pipe 2 is provided on the fluid pipe 2 and a water leak W occurs in the fluid pipe 2 near the structure 20. As shown in the upper part of the figure, a metal band 3 and a waterstop sheet 5 are placed on the fluid pipe 2 and a fastening mechanism 4 is temporarily fastened. A rubber string 7 is wrapped around the metal band 3 and the structure 20 and bonded with an adhesive to form a ring-shaped rubber. Next, the metal band 3 is moved toward the structure 20, and the rubber string 7 is sandwiched between the metal band 3 and the structure 20, compressing the rubber string 7. The metal band 3 is then fastened and fixed with the fastening mechanism 4. The rubber compression is the same as in FIG. 25 . As a result, the metal band 3 is in close contact with both the fluid pipe 2 and the structure 20 via the rubber, thereby improving water leakage prevention performance.

[0058] As described above, although not particularly limited, as in the first embodiment, the water leakage repair fitting 1 is a water leakage repair fitting to be attached to the water leaking portion 2x of the fluid pipe 2, and includes a plurality of metal bands 3 provided at intervals in the circumferential direction CD of the fluid pipe 2, a water stop sheet 5 formed of an elastic body and provided on the inner circumferential surface 3a of each of the plurality of metal bands 3 to seal the gap between the metal band 3 and the outer circumferential surface 2b of the fluid pipe 2, and a fastening mechanism 4 to fasten the ends of the plurality of metal bands 3 together in the circumferential direction of the pipe, The inner surface 5a of the water sheet 5 has a plurality of first ribs 51 extending in the circumferential direction CD of the tube, a plurality of second ribs 52 extending in the axial direction AD of the tube, and a plurality of first recesses 54, and each of the plurality of first recesses 54 is formed by being blocked by the plurality of first ribs 51 and the plurality of second ribs 52, and the outer end 53e of the outermost rib 53 of the plurality of first ribs 51, which is located furthest outward in the axial direction AD1, may be positioned inward in the axial direction AD2 of the outer end 3e of the metal band 3 in the axial direction of the tube.

[0059] The waterstop sheet 5 is compressed by fastening the multiple metal bands 3 with the fastening mechanism 4. Multiple first recesses 54 that block the waterstop sheet 5 are formed on the inner peripheral surface 5a of the waterstop sheet 5. The first recesses 54 are formed by first ribs 51 extending in the pipe circumferential direction CD and second ribs 52 extending in the pipe axis direction AD. The first ribs 51 tend to escape toward the pipe axis direction outer side AD1 due to water leakage. This is particularly noticeable in the outermost rib 53, which is located furthest toward the pipe axis direction outer side AD1 among the multiple first ribs 51. Because the pipe axis direction outer end 53e of the outermost rib 53 is positioned more inward in the pipe axis direction AD2 than the pipe axis direction outer end 3e of the metal band 3, even if the outermost rib 53 tends to escape toward the pipe axis direction outer side AD1, the metal band 3 can hold down the outermost rib 53, preventing water leakage due to deformation of the outermost rib 53.

[0060] 17, when the metal bands 3 are fastened by the fastening mechanism 4, the outer ends 3e of the metal bands 3 in the pipe axis direction may be bent more toward the inner side RD2 in the pipe diameter direction of the fluid pipe 2 than the central parts 3c in the pipe axis direction. With this configuration, the outer ends 5e of the waterstop sheet 5 in the pipe axis direction can be compressed more strongly than other parts, and the waterstop performance of the outer ends 5e of the waterstop sheet 5 in the pipe axis direction can be improved.

[0061] Although not particularly limited, as in the first embodiment, the outer end 53e of the outermost rib 53 located furthest outward in the pipe axis direction AD1 among the plurality of first ribs 51 may be located more inward in the pipe axis direction AD2 than the outer end 5e of the waterstop sheet 5. With this configuration, the outer end 5e of the waterstop sheet 5 can also suppress deformation of the outermost rib 53, making it possible to further prevent water leakage.

[0062] Although not particularly limited, as in the first embodiment, second recesses 56 corresponding to each of the first recesses 54 may be formed on the outer surface 5b of the water-stop sheet 5, and the second recesses 56 may be arranged only within the range Ar1 that overlaps with the first recesses 54 when projected parallel to the pipe radial direction RD.

[0063] According to this configuration, the second recesses formed on the outer peripheral surface 5b of the waterstop sheet 5 are positioned only within the range Ar1 overlapping with the first recesses 54 and are not positioned where they overlap with the first ribs 51 and the second ribs 52. This prevents the first ribs 51 and the second ribs 52 from appropriately pressing against the outer peripheral surface 2b of the fluid pipe 2, thereby maintaining the waterstop effect. Furthermore, because the second recesses 56 are located on the outer peripheral side of the first recesses 54, even if the first recesses 54 are filled with water, the region P1 of the waterstop sheet 5 between the first recesses 54 and the second recesses 56 can be deformed radially outward in the pipe direction RD1. This deformation allows the waterstop sheet 5 to be compressed even when the first recesses 54 are filled with water, preventing compression from being hindered by water leakage and enabling the waterstop sheet 5 to be appropriately compressed and sealed.

[0064] Although not particularly limited, as in the first embodiment, in a natural state where no external force is acting on the water stop sheet 5, the volume of each second recess (56) may be equal to or greater than the volume change when one first recess 54 is compressed 1 mm in the pipe radial direction RD. This allows water to escape toward the second recess 56 even if the first recess 54 is filled with water, making it possible to compress the water stop sheet 5 accurately.

[0065] 19, the outer end 3e of the metal band 3 in the pipe axis direction may protrude further toward the outer side AD1 in the pipe axis direction than the outer end 5e of the waterstop sheet 5 in the pipe axis direction, a second recess 56 is formed corresponding to the outer side RD1 in the pipe diameter direction of the first recess 54 that is located furthest outward in the pipe axis direction AD1 among the multiple first recesses 54, the waterstop sheet 5 and the outer end 35x in the pipe axis direction of the metal band 3 are fixed, the waterstop sheet 5 is made of rubber, and the rubber hardness of the waterstop sheet 5 is 60 degrees or more and 80 degrees or less. This configuration can prevent adverse effects from being caused by the second recess 56 located furthest outward in the pipe axis direction AD1, thereby improving waterstop performance.

[0066] Although not particularly limited, as in the embodiment shown in Figure 20, the outer end 3e of the metal band 3 in the pipe axis direction protrudes further outward in the pipe axis direction AD1 than the outer end 5e of the waterstop sheet 5, a second recess 56 is formed corresponding to the outer diameter RD1 in the pipe axis direction of the first recess 54 that is furthest outward in the pipe axis direction AD1 among the multiple first recesses 54, the waterstop sheet 5 and the outer end 35x of the metal band 3 in the pipe axis direction are fixed, the waterstop sheet 5 has a hybrid structure in which the hardness of the end region Ar2 on the outer side in the pipe axis direction AD1 is higher than the hardness of the inner region Ar3 on the inner side in the pipe axis direction AD2 than the end region Ar2, and the interface Br1 between the end region Ar2 and the inner region Ar3 may be located at a position overlapping the second first rib 51 counting from the outer side in the pipe axis direction AD1 or at a position on the inner side in the pipe axis direction AD2 than the second first rib 51. According to this configuration, the area AD1 further outward in the axial direction than the second first rib 51 always becomes the end area Ar2, which has high hardness, and it is possible to prevent the second recess 56 located furthest outward in the axial direction AD1 from having an adverse effect, thereby improving water-stopping performance.

[0067] Although not particularly limited, as in the embodiment shown in Figure 21, the pipe axis direction outer end 3e of the metal band 3 protrudes further toward the pipe axis direction outer side AD1 than the pipe axis direction outer end 5e of the waterstop sheet 5. The pipe axis direction outer end 35x of the waterstop sheet 5 and the metal band 3 are fixed. Fixing can be done by adhesive bonding or lining fixation. Of the multiple first recesses 54, the first recess 54 located furthest toward the pipe axis direction outer side AD1 does not have a corresponding second recess 56 formed on the pipe radial direction outer side RD1. With this configuration, it is possible to avoid adverse effects of the second recess 56 and improve water stop performance.

[0068] Although not particularly limited, as in the first embodiment, the metal band 3 may have annular portions 30 formed at both ends in the pipe circumferential direction CD 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, the fastening mechanism 4 has 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 fastening the rotating shafts 40 together, and the metal band 3 may be positioned in a position where the tips 31 of the welded metal sheet are on the inside RD2 in the pipe radial direction.

[0069] When the metal plate is bent to form the annular portion 30, the welded portion (P11) of the tip 31 of the metal plate tends to float toward the outer side RD1 in the pipe radial direction. If the tip 31 of the welded and fixed metal plate is located on the inner side RD2 in the pipe radial direction as in this embodiment, the thick portion of the tip 31 can more easily press the waterstop sheet 5 on the inner side RD2 in the pipe radial direction than if it were located on the outer side RD1 in the pipe radial direction, and this makes it possible to prevent a decrease in the waterstop effect.

[0070] Although not particularly limited, as in a modified example of the first embodiment, the metal band 3 has annular portions 30 formed at both ends of the pipe circumferential direction CD by bending sheet metal and welding tips 31 on both sides of the sheet metal in the pipe circumferential direction CD to the sheet metal, the fastening mechanism 4 has 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 metal band 3 has a first portion P11 to which the tip 31 of the sheet metal is welded, and a second portion P12 that is more inward in the pipe circumferential direction than the first portion P11, and the thickness of the portion of the water-stop sheet 5 that contacts the first portion P11 is greater than the thickness of the portion of the water-stop sheet 5 that contacts the second portion P12.

[0071] When the metal plate is bent to form the annular portion 30, the welded portion (P11) of the tip 31 of the metal plate tends to float toward the outer side RD1 in the pipe radial direction. As in the present embodiment, the thickness of the portion of the water-stop sheet 5 that contacts the first portion P11 is made thicker than the thickness of the portion that contacts the second portion P12 that is circumferentially more inward than the first portion P11, so by making the water-stop sheet 5 thicker, it is possible to prevent a local decrease in the water-stopping effect at the first portion P11.

[0072] 9 to 12, the metal band 3 has an annular portion 30 at each end in the pipe circumferential direction CD, the fastening mechanism 4 has a rotating shaft (40, 140) inserted into the annular portion 30 and rotatable within the annular portion 30, and a bolt 41 and a nut 42 fastening the rotating shaft (40, 140) together, the rotating shaft (40, 140) has a protrusion (40t, 140t) that interferes with the metal band 3 to prevent the rotating shaft (40, 140) from falling off the annular portion 30, and in a first rotational position in which the rotating shafts (40, 140) are fastened together by the bolt 41 and the nut 42, the protrusion (40t, 140t) interferes with the metal band 3 to prevent it from falling off, and in a second rotational position different from the first rotational position, the protrusion (40t, 140t) can remove the rotating shaft (40, 140) from the annular portion 30 without interfering with the metal band 3.

[0073] With such a metal band 3 and fastening mechanism 4, even if the diameter size or fastening force of the fluid pipe 2 is changed, the rotation of the rotating shaft (40, 140) can put the bolt 41 and nut 42 into an appropriate position for fastening, thereby increasing the fastening force of the metal band 3. Moreover, since the rotating shaft (40, 140) is provided with a protrusion (40t, 140t) that has a function of preventing them from falling off, it is sufficient to put them into the second rotation position when attaching or detaching them, and they are prevented from falling off in the first rotation position, so falling off during work can be suppressed or prevented, and the installation work can be made easier.

[0074] Although not particularly limited, as in the first embodiment, the rotating shaft 40 may have a bolt insertion hole 40s through which the bolt 41 is inserted, and the inner surface of the bolt insertion hole 40s may be a flat surface without a thread groove. As a result, if the orientation of the bolt 41 needs to be changed due to a surrounding obstacle, there is no need to remove the rotating shaft 40 because the inner surface of the bolt insertion hole 40s is a flat surface without a thread groove. The bolts can be replaced one by one in order, and there is no need to break up the temporary assembly of the metal band 3. Therefore, the rotating shaft will not fall off and can be prevented from being lost. This is particularly preferable when attaching to an aqueduct with a river below.

[0075] Although not particularly limited, as in the first embodiment, the metal band 3 has an annular portion 30 at each end in the pipe circumferential direction CD, the fastening mechanism 4 has a rotating shaft 40 that is inserted into the annular portion 30 and can rotate within the annular portion 30, and a bolt 41 and a nut 42 that fasten the rotating shafts 40 together, and a spacer 43 that protrudes radially from the bolt axis 41x beyond the rotating shaft 40 is attached to the bolt 41, and when the spacer 43 comes into contact with the metal band 3, a space SP1 is formed between the nut 42 and the metal band 3 in which a tool K that fastens the nut 42 can be placed. According to this configuration, it is possible to avoid the loss of the space SP1 for placing the tool K between the nut 42 and the metal band 3, thereby improving workability.

[0076] Although not particularly limited, as in the embodiment shown in Figures 8A and 9, the metal band 3 has annular portions 30 at both ends in the pipe circumferential direction CD, the fastening mechanism 4 has a rotating shaft 40 that is inserted into the annular portion 30 and can rotate within the annular portion 30, and a bolt 41 and a nut 42 that fasten the rotating shafts 40 together, the bolt 41 is a headed bolt that has a head 41a at a first end and a nut 42 attached to a second end 41b, and the rotating shaft 40 on the head 41a side has a rotation restriction groove 41c that engages with the head 41a to restrict rotation of the bolt 41. As a result, the rotation of the bolt 41 is restricted by the rotation restricting groove 41c formed in the rotary shaft 40, so that fastening can be achieved simply by tightening the nut 42, thereby improving workability.

[0077] Although not particularly limited, as in the embodiment shown in FIG. 13, the metal band 3 has annular portions 30 at both ends in the pipe circumferential direction CD, the fastening mechanism 4 has a rotating shaft (240, 340) 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 (240, 340) together, the bolt 41 being a headed bolt having a head 41a at a first end and a nut 42 attached to a second end 41b, and the first rotating shaft 2 on the head 41a side 40 has a head accommodating groove 241c in which the head 41a is embedded so that it can rotate relative to the annular portion 30, and the second rotating shaft 340 on the nut 42 side has an open groove 340c that receives the shaft of the bolt 41 from the radial outside of the second rotating shaft 340 as the first rotating shaft 240 rotates, and a retaining washer 45 that engages with the second rotating shaft 340 to prevent the shaft of the bolt 41 from coming out of the open groove 340c may be attached between the second rotating shaft 340 and the nut 42. With this configuration, the bolts 41 and nuts 42 are attached before the water leak repair fitting 1 is attached to the fluid pipe 2, and the water leak repair fitting 1 can be attached to the fluid pipe 2 without removing the nuts 42. This makes it possible to prevent parts that make up the fastening mechanism 4, such as nuts, from being lost on site, for example, by dropping them into a river.

[0078] Although not particularly limited, as in the embodiment shown in Figure 14, the metal band 3 has an annular portion 30 at each end in the pipe circumferential direction CD, the fastening mechanism 4 has a rotating shaft 440 that is inserted into the annular portion 30 and can rotate within the annular portion 30, and a bolt 41 and a nut 42 that fasten the rotating shafts 440 together, the bolt 41 is a headed bolt that has a head 41a at a first end and a nut 42 attached to a second end 41b, and a rotation restricting washer 141 that engages with the head and the rotating shaft 440 and restricts rotation of the bolt 41 is attached between the head 41a and the rotating shaft 440. According to this configuration, the rotation of the bolt 41 is restricted by the rotation restricting washer 141, so that fastening can be performed simply by tightening the nut 42, thereby improving workability.

[0079] Although not particularly limited, as in the embodiment shown in Figures 15A and 15B, the metal band 3 has an annular portion 30 at each end in the pipe circumferential direction CD, the fastening mechanism 4 has a rotating shaft 40 inserted into the annular portion 30 and rotatable within the annular portion, and a bolt 41 and a nut 42 that fasten the rotating shafts 40 together, and between adjacent metal bands 3 in the pipe circumferential direction CD, there are provided a metal plate 32 arranged on the outer periphery of the water-stop sheet 5 and a pressing mechanism 6 that presses the metal plate 32 using the shaft of the bolt 41 as a foothold. According to this configuration, the fastening force of the metal plate 32, which is the part that presses the water stop sheet 5 with a weaker force than the metal band 3, can be increased, thereby improving the water stop performance.

[0080] Although not particularly limited, as in the first embodiment, the multiple metal bands 3 may have two or three of three types, with lengths L1 along the pipe circumferential direction CD of 250 mm, 400 mm, and 600 mm. With this configuration, by combining two of the three types of metal bands, it is possible to accommodate seven different sizes of fluid pipes: 300mm, 350mm, 400mm, 450mm, 500mm, 600mm, and 700mm, reducing inventory while still being able to respond to emergency leaks.

[0081] 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.

[0082] 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. [Explanation of symbols]

[0083] 1. Leak repair fittings (leak repair devices, leak repair tools) 2 Fluid tube 2x Leakage part 3 Metal Band P11 1st part P12 2nd part 30 Annular section 4 Fastening mechanism 40,140,240,340,440 Rotation axis 40t,140t protrusion 41 volts 42 Nut 43 Spacer 44 Anti-slip member 45 Retaining washer 5. Waterproof sheet 51 First Rib 52 Second Rib 53 Outermost rib 54 First recess 56 Second recess 6 Pressing mechanism CD circumferential direction

Claims

1. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; A water leak repair fitting, wherein second recesses corresponding to at least some of the first recesses among the plurality of first recesses are formed on the outer surface of the water stop sheet, and the second recesses are arranged only within the range that overlaps with the first recesses when projected parallel to the pipe diameter direction.

2. A water leak repair fitting as described in Claim 1, wherein the water stop sheet and the metal band are bonded together.

3. A water leakage repair fitting as described in claim 1 or 2, wherein the second recess is positioned narrower than the area of ​​the first recess projected parallel to the pipe diameter direction.

4. A water leakage repair fitting as described in any of claims 1 to 3, wherein when the water stop sheet is compressed, the portion of the water stop sheet between the first recess and the second recess can be deformed outward in the pipe diameter direction.

5. A water leak repair fitting as described in any one of claims 1 to 4, wherein in a natural state where no external force is acting on the water stop sheet, the volume of each second recess is equal to or greater than the volume change when one first recess is compressed 1 mm in the pipe diameter direction.

6. A water leak repair fitting described in any of claims 1 to 5, wherein the water stop sheet is made of rubber and the rubber hardness of the water stop sheet is 60 degrees or more and 80 degrees or less.

7. The water leak repair fitting according to any one of claims 1 to 6, wherein when the metal band is fastened by the fastening mechanism, the outer end of each of the metal bands in the pipe axis direction is bent more inward in the pipe diameter direction of the water pipe than the central portion of the pipe axis direction.

8. A water leak repair fitting as described in any one of claims 1 to 7, wherein the outer end of the outermost rib among the plurality of first ribs that is located furthest outward in the pipe axis direction is located more inward in the pipe axis direction than the outer end of the water stop sheet in the pipe axis direction.

9. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; Second recesses corresponding to at least some of the first recesses are formed on the outer peripheral surface of the water stop sheet, and the second recesses are arranged only within an area that overlaps with the first recesses when projected parallel to the pipe diameter direction, The outer end of the metal band in the pipe axis direction protrudes outward in the pipe axis direction beyond the outer end of the waterstop sheet in the pipe axis direction, The second recess is formed corresponding to the outer side in the pipe diameter direction of the first recess that is the outermost in the pipe axis direction among the plurality of first recesses, and the water stop sheet and the outer end of the metal band in the pipe axis direction are fixed, The water-stopping sheet has an end region on the outside in the pipe axial direction and an inner region located more inward in the pipe axial direction than the end region, and has a hybrid structure in which the hardness of the end region is higher than the hardness of the inner region, and the interface between the end region and the inner region is located at a position overlapping the second first rib counting from the outside in the pipe axial direction or at a position more inward in the pipe axial direction than the second first rib, water leak repair fitting.

10. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; Second recesses corresponding to at least some of the first recesses are formed on the outer peripheral surface of the water stop sheet, and the second recesses are arranged only within an area that overlaps with the first recesses when projected parallel to the pipe diameter direction, The outer end of the metal band in the pipe axis direction protrudes outward in the pipe axis direction beyond the outer end of the waterstop sheet in the pipe axis direction, The water stop sheet and the metal band are fixed at their outer ends in the pipe axial direction, The water leak repair fitting has no corresponding second recess formed radially outward of the first recess located furthest outward in the pipe axial direction among the plurality of first recesses.

11. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; the metal band has annular portions formed at both ends in the circumferential direction of the pipe by bending a metal plate and welding tips on both sides of the metal plate in the circumferential direction of the pipe to the metal plate, the fastening mechanism includes a rotating shaft that is inserted into the annular portion and is rotatable within the annular portion, and a bolt and a nut that fasten the rotating shafts together, The metal band has a first portion to which a tip of the metal plate is welded and a second portion located inward in a circumferential direction of the pipe relative to the first portion, The thickness of the portion of the water stop sheet that contacts the first portion is greater than the thickness of the portion of the water stop sheet that contacts the second portion.

12. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; the metal band has an annular portion at each end in the circumferential direction of the pipe, the fastening mechanism includes a rotating shaft that is inserted into the annular portion and is rotatable within the annular portion, and a bolt and a nut that fasten the rotating shafts together, the rotating shaft has an arcuate outer peripheral surface and a protrusion that protrudes radially outward from the outer peripheral surface of the rotating shaft, and is configured to prevent the protrusion from interfering with the metal band and causing the rotating shaft to fall off the annular portion, The water leak repair fitting is configured such that in a first rotational position in which the rotating shafts are fastened together with the bolts and nuts, the protrusion interferes with the metal band to prevent it from falling off, and in a second rotational position different from the first rotational position, the protrusion does not interfere with the metal band and the rotating shaft can be removed from the annular portion.

13. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; the metal band has an annular portion at each end in the circumferential direction of the pipe, the fastening mechanism includes a rotating shaft that is inserted into the annular portion, is rotatable within the annular portion, and has an arc-shaped outer peripheral surface; and a bolt and a nut that fasten the rotating shafts together, A spacer is attached to the bolt between the nut and the rotating shaft, the spacer having a flange that protrudes radially outward from the bolt shaft, the outer diameter of the flange along the radial direction of the bolt shaft being larger than the outer diameter of the rotating shaft along the radial direction of the bolt shaft when viewed in a line of sight parallel to the axis of the rotating shaft, and the flange of the spacer comes into contact with the metal band, thereby forming a space between the nut and the metal band in which a tool for tightening the nut can be placed.

14. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; the metal band has an annular portion at each end in the circumferential direction of the pipe, the fastening mechanism includes a rotating shaft that is inserted into the annular portion and is rotatable within the annular portion, and a bolt and a nut that fasten the rotating shafts together, the bolt is a headed bolt having a hexagonal head at a first end and a second end to which the nut is attached; The rotating shaft on the head side has an arc-shaped outer peripheral surface and a rotation restricting groove that is recessed radially inward of the rotating shaft relative to the outer peripheral surface and engages with the hexagonal head to restrict rotation of the bolt, The rotation restriction groove has a flat surface that serves as a seat for the hexagonal head, a bolt hole formed in the flat surface, and two surfaces that are perpendicular to the flat surface and parallel to each other, and the two surfaces come into contact with the hexagonal head of the bolt inserted into the bolt hole, thereby restricting the rotation of the bolt.

15. A water leak repair fitting to be attached to a leaking part of a water pipe, a plurality of metal bands provided at intervals in a circumferential direction of the water pipe; a water stop sheet provided on the inner circumferential surface of each of the plurality of metal bands, formed of an elastic body, and sealing the gap between the metal band and the outer circumferential surface of the water pipe; a fastening mechanism that fastens together the ends of the plurality of metal bands in the pipe circumferential direction, The inner peripheral surface of the water-stop sheet has a plurality of first ribs extending in the pipe circumferential direction, a plurality of second ribs extending in the pipe axial direction, and a plurality of first recesses, the plurality of first recesses are formed by being closed by the plurality of first ribs and the plurality of second ribs, an outer end of an outermost rib in the tube axis direction among the plurality of first ribs is located more inward in the tube axis direction than an outer end of the metal band in the tube axis direction; the metal band has an annular portion at each end in the circumferential direction of the pipe, the fastening mechanism includes a rotating shaft that is inserted into the annular portion and is rotatable within the annular portion, and a bolt and a nut that fasten the rotating shafts together, The water-stop sheet has tapered end portions formed in a tapered shape on both sides in the circumferential direction of the pipe, and an intermediate portion located between the tapered end portions, the tapered end portion on a first side in the circumferential direction of the pipe protrudes toward the first side beyond a first annular portion on the first side of the metal band, A water leak repair fitting in which, when a perpendicular line is drawn from the center of rotation of the rotating shaft arranged in the first annular portion to the inner surface of the first annular portion in the pipe diameter direction, the portion of the water stop sheet on the first side of the perpendicular line has a higher rubber hardness than the middle portion.

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