Water leak repair fittings, water leak repair methods

Abstract

We offer a new leak repair technology. [Solution] The leak repair method is a leak repair method for repairing a leaking section 2x of a water pipe (2), and includes: a first step of positioning a plurality of metal bands 3, each with a water-stopping sheet 5 made of an elastic material on its inner surface, at a position offset in the direction of the pipe axis from the leaking section 2x, and temporarily fastening the ends of adjacent metal bands 3 together with a fastening mechanism 4; a second step of shifting the metal bands 3 and water-stopping sheets 5 in the direction of the pipe axis after the first step, and moving them to a position that covers the leaking section 2x; and a third step of fastening the fastening mechanism 4 to reduce the diameter between the plurality of metal bands 3 and press the water-stopping sheets 5 against the outer surface of the water pipe (2) to compress them.

Description

Technical Field

[0001] The present disclosure relates to a water leakage repair fitting for fluid pipes such as water pipes, and a water leakage repair method.

Background Art

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

[0003] The repair device shown in Patent Document 1 has a metal band wound around a water leakage part of a fluid pipe, a fastening mechanism for fastening the metal band, and a rubber sheet disposed on the inner peripheral side of the metal band.

[0004] Such a device is likely to exhibit water stop performance if it can hold down the water leakage part at the central part in the pipe axis direction of the fluid pipe in the metal band. If it can hold down the water leakage part at the central part in the pipe axis direction of the fluid pipe in the metal band, it is likely to exhibit water stop performance.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present disclosure provides a new water leakage repair technology.

Means for Solving the Problems

[0007] The leak repair method of this disclosure is a leak repair method for repairing a leak in a water pipe, and includes: a first step of positioning a plurality of metal bands, each having a water-stopping sheet made of an elastic material on its inner surface, at a position offset in the direction of the pipe axis from the leak, and temporarily fastening the ends of adjacent metal bands together with a fastening mechanism; a second step of shifting the metal bands and the water-stopping sheets in the direction of the pipe axis after the first step to a position that covers the leak; and a third step of fastening the fastening mechanism to reduce the diameter between the plurality of metal bands and pressing the water-stopping sheets against the outer surface of the water pipe to compress them. [Brief explanation of the drawing]

[0008] [Figure 1] A side view showing a leak repair fitting attached to a fluid pipe according to the first embodiment of this disclosure. [Figure 2] Cross-sectional view of section II-II in Figure 1. [Figure 3] A side view showing the metal band and the watertight sheet integrated with the metal band before they are attached to the fluid pipe. [Figure 4A] A plan view showing a metal band. [Figure 4B] Side view showing a metal band. [Figure 5A] A view of the water-stopping sheet from the inner circumferential side (inward in the direction of the pipe diameter). [Figure 5B] Cross-sectional view of the VV region in Figure 5A. [Figure 6] A diagram showing the assembly process for leak repair fittings. [Figure 7] A partial plan view and cross-sectional view showing the compression process of the waterproofing sheet during the assembly process. [Figure 8A] Plan view and partially fractured cross-sectional view showing the fastening mechanism. [Figure 8B] A side view showing the fastening mechanism. [Figure 9] Plan view, left side view, right side view, and front view showing the axis of rotation. [Figure 10] Side view showing the axis of rotation in the first and second rotation positions. [Figure 11] Plan view and front view showing the axis of rotation of a modified example. [Figure 12] Side view showing the rotation axes in the first rotation posture and the second rotation posture of the modified example. [Figure 13] Partial cutaway sectional view and right side view showing the rotation axis and fastening mechanism of the modified example. [Figure 14] Plan view and side view showing the fastening mechanism of the modified example. [Figure 15A] Plan view showing the pressing mechanism of the modified example. [Figure 15B] Cross-sectional view of the XV-XV part in Fig. 15A. [Figure 16] Cross-sectional view of the water stop sheet of the modified example. [Figure 17] Cross-sectional view showing the metal band and water stop sheet in the fastened state of the modified example shown in Fig. 16. [Figure 18] Cross-sectional view regarding a new problem. [Figure 19] Partial plan view and cross-sectional view showing the water stop sheet and metal band of the modified example. [Figure 20] Partial plan view and cross-sectional view showing the water stop sheet and metal band of the modified example. [Figure 21] Partial plan view and cross-sectional view showing the water stop sheet and metal band of the modified example. [Figure 22] Plan view showing the state where the metal band, water stop sheet, and fastening mechanism of the second embodiment are assembled. [Figure 23] Side view showing the state where the metal band, water stop sheet, and fastening mechanism of the second embodiment are assembled. [Figure 24] Plan view, left side view, right side view showing the rotation axis of the second embodiment, and cross-sectional view of the A24-A24 part in Fig. 24. [Figure 25] Diagram showing the assembly process of the water leakage repair fitting. [Figure 26] Diagram showing the assembly process of the water leakage repair fitting.

Mode for Carrying Out the Invention

[0009] <First Embodiment> The leak repair fitting and repair method of the first embodiment of this disclosure will be described below with reference to the drawings. In Figure 3, hatching is added to make the components easier to distinguish. In Figure 5A, one part is shown in enlargement.

[0010] As shown in Figures 1 and 2, the leak repair fitting 1 is attached to the leak 2x of a fluid pipe 2 such as a water pipe. The leak repair fitting 1 has a plurality of metal bands 3, a fastening mechanism 4, and a water-stopping sheet 5. The term "fitting" in the context of the leak repair fitting indicates that the material of the plurality of metal bands is metal, and does not mean that the material of other components, such as the water-stopping sheet, is limited to metal.

[0011] Multiple metal bands 3 are provided at intervals along the circumferential direction CD of the fluid tube 2. Further details will be described later.

[0012] The fastening mechanism 4 fastens the ends of multiple metal bands 3 in the circumferential direction of the pipe together. The fastening mechanism 4 includes bolts and nuts. Further details will be described later.

[0013] The waterproofing sheet 5 is made of an elastic material such as rubber. As shown in Figures 2 and 3, the waterproofing sheet 5 is provided on the inner circumferential surface 3a of each of the multiple metal bands 3. In this embodiment, the waterproofing sheet 5 is attached to the inner circumferential surface 3a of the metal bands 3 via an adhesive (not shown). As shown in Figure 2, when the fastening mechanism 4 is fastened with the multiple metal bands 3 connected in a ring shape by the fastening mechanism 4, the waterproofing sheet 5 is pressed against the outer circumferential surface 2b of the fluid pipe 2. As a result, the waterproofing sheet 5 seals the space between the metal bands 3 and the outer circumferential surface 2b of the fluid pipe 2, stopping water leakage from the fluid pipe 2.

[0014] As shown in Figure 3, both ends 5c and 5d of the water-stopping sheet 5 in the circumferential direction CD are formed in a tapered shape. This allows the first water-stopping sheet 5 and the second water-stopping sheet 5 to be adjacent to each other in the circumferential direction CD, and the circumferential end 5d of the first water-stopping sheet 5 and the circumferential end 5c of the second water-stopping sheet 5 to overlap, thereby preventing the thickness of the water-stopping sheet 5 from changing in a step-like manner. As a result, the outer 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 positioned on the outer circumference (outer diameter RD1) of the watertight sheet 5 between adjacent metal bands 3 in the circumferential direction CD. The metal plate 32 is fitted and bonded to the corresponding recess of the watertight sheet 5. The metal plate 32 is provided to hold down the watertight sheet 5 between the metal bands 3. Preferably, the metal plate 32 overlaps the line L3 connecting the rotation axis C1 of the rotation axis 40 to the center of the fluid pipe. This allows the tightening force of the fastening mechanism 4 to be appropriately transmitted to the watertight sheet 5, improving the sealing effect. Preferably, the end of the metal plate 32 in the circumferential direction CD does not reach the first portion P11. This is because if the metal plate 32 reaches the first portion P11, the metal becomes thicker, disrupting the overall pressure balance. The length of the metal plate 32 in the circumferential direction CD may be three times or more the diameter of the rotation axis 40.

[0016] As shown in Figures 5A and 5B, the inner circumferential surface 5a of the watertight 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 second ribs 52 protrude inward RD2 in the pipe radial direction beyond the bottom 54s of the first recess 54. The first recess 54 is formed by being 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. One cell constituting the mesh is one first recess 54. In this embodiment, the shape of the first recess 54 as viewed from the inward RD2 in the pipe radial direction is rectangular (square), and in three dimensions the first recess 54 is a cuboid, but is not limited to this. For example, it may be rhombus, circular, or elliptical in shape.

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

[0018] Furthermore, in order to ensure that the deformed outermost rib 53 does not protrude from the watertight sheet 5 when the outermost rib 53 attempts to deform outward AD1 in the pipe axial direction due to water pressure, it is preferable that the outermost end 53e of the outermost rib 53 in the pipe axial direction is located inward AD2 than the outermost end 5e of the watertight sheet 5 in the pipe axial direction. It is preferable that the pipe axial dimension D3 from the outermost end 53e of the outermost rib 53 in the pipe axial direction to the outermost end 5e of the watertight sheet 5 in the pipe axial direction is 1 / 2 or more of the pipe axial dimension D1 of the outermost rib 53.

[0019] As shown in Figures 5B and 7, minute protrusions 55 with a width D2 and protrusion height of 0.75 mm or less are formed on the inner circumferential surface of the first rib (including the outermost rib 53) and the second rib 52, but the minute protrusions 55 are optional. Alternatively, minute depressions with a width and depth of 0.75 mm or less may be formed instead of the minute protrusions 55. By providing minute protrusions 55 or minute depressions, minute irregularities such as rust and corrosion that occur on the pipe surface can be absorbed.

[0020] As shown in Figures 5B and 7, the outer surface 5b of the watertight sheet 5 has second recesses 56 formed therein, corresponding to at least some of the first recesses 54 among the plurality of first recesses 54. The second recesses 56 are located only within the range Ar1 that overlaps with the first recesses 54 when projected parallel to the pipe diameter direction RD. If the second recesses 56 are outside the range Ar1, the footing of the first rib 51 or second rib 52 will be weakened, and the first rib 51 or second rib 52 will not be able to properly press against the outer surface 2b of the fluid pipe 2. In this embodiment, the second recesses 56 are formed in a circular shape when viewed from a line of sight parallel to the pipe diameter direction RD, and in a cylindrical shape when viewed in three dimensions, but are not limited to a circular shape. For example, the second recesses 56 may be short in shape, similar to the first recesses 54, when viewed from a line of sight parallel to the pipe diameter direction RD.

[0021] As shown in Figure 3, the water-sealing sheet 5 has tapered ends 5c and 5d on both sides in the circumferential direction CD of the pipe, and an intermediate portion 5f located between the tapered ends 5c and 5d. Although not particularly limited, in this embodiment, the thickness of the intermediate portion 5f is 6.0 mm to 6.5 mm. To achieve water-sealing performance, it is preferable that the thickness is between 4 mm and 8 mm. If it is less than 4 mm, the water-sealing performance will be insufficient, and if it exceeds 8 mm, the water-sealing sheet 5 may not conform well to the outer surface of the pipe and may not be properly compressed, potentially reducing the water-sealing performance.

[0022] A brief explanation of the assembly process (repair method) for leak repair fitting 1 is provided below. First, as shown in the upper part of Figure 6 and the upper part of Figure 7, in a situation where water leakage W is occurring from the leak 2x of the fluid pipe 2, a metal band 3 and a water-stopping sheet 5 are placed on the outer diameter RD1 of the fluid pipe 2. The metal band 3 and the water-stopping sheet 5 are positioned offset from the leak 2x in the pipe axis direction AD so as not to be subjected to the water pressure of the water gushing out from the leak 2x. Next, the ends of adjacent metal bands 3 are temporarily fastened together using the fastening mechanism 4 (temporary fastening of bolts and nuts). Next, as shown in the lower part of Figure 6 and the central part of Figure 7, after the temporary fastening by the fastening mechanism 4 is completed, the metal band 3 and the water-stopping sheet 5 are shifted in the pipe axis direction AD to a position that covers the leak 2x. At this time, the first recess 54, which is closed by the outer surface 2b of the fluid pipe 2, is filled with water. In Figure 7, water is schematically shown with 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 water-stopping sheet 5 is pressed against the outer surface 2b of the fluid pipe 2 and compressed. It is preferable that the rubber hardness of the water-stopping sheet 5 is 60 degrees or more and 80 degrees or less. When the rubber hardness of the water-stopping sheet 5 is 60 degrees, it is preferable that the amount of compression is 1.0 mm or more and 1.6 mm or less along the pipe diameter direction RD. This is because if the amount of compression when the rubber hardness of the water-stopping sheet 5 is 60 degrees is less than 1.0 mm, water leakage will occur and the water-stopping effect will not be achieved, and if the amount of compression exceeds 1.6 mm, the water-stopping sheet 5 will be crushed too much and the water-stopping effect will not be improved. When the rubber hardness of the water-stopping sheet 5 is 80 degrees, it is preferable that the amount of compression is 0.5 mm or more and 1.0 mm or less along the pipe diameter direction RD. If the compression amount of the waterproofing sheet 5 is less than 0.5 mm when the rubber hardness of the waterproofing sheet 5 is 80 degrees, water leakage will occur and the waterproofing effect will not be achieved. If the compression amount exceeds 1.0 mm, the waterproofing sheet 5 will be crushed too much and the waterproofing effect will not be improved. The rubber hardness referred to in this specification is the hardness measured according to the measurement method based on JIS K7312, and is measured in a 23°C environment using Type C. Water is an incompressible fluid, and when each of the first recesses 54 is filled with water, it becomes a resistance when the first rib 51 and the second rib 52 of the waterproofing sheet 5 are compressed. Since the second recess 56 is located on the outer circumference side of the first recess 54 (outer RD1 in the pipe radial direction), when the waterproofing sheet 5 is compressed, the part P1 of the waterproofing sheet 5 between the first recess 54 and the second recess 56 deforms outward RD1 in the pipe radial direction, and the volume of the first recess 54 can be kept constant while compression is performed, so that water leakage can be stopped even if the first recess 54 is filled with water.

[0023] As shown in Figures 5B and the upper part of Figure 7, in a natural state (uncompressed state) where no external force is acting on the water-stopping sheet 5, it is preferable that the volume of each second recess (56) is equal to or greater than the volume change when one first recess 54 is compressed by 1 mm in the pipe radial direction RD. More preferably, it is preferable that the volume of each second recess (56) is equal to or greater than the volume change when one first recess 54 is compressed by 1.5 mm in the pipe radial direction RD. The above 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 Figures 3, 4A, and 4B, the metal band 3 has annular portions 30 at both ends in the circumferential direction CD of the pipe. The annular portions 30 are formed by bending a sheet metal and welding the ends 31 on both sides of the sheet metal in the circumferential direction CD to the sheet metal. In the embodiment shown in the figures, the metal band 3 is positioned such that the welded ends 31 of the sheet metal are on the inner side RD2 in the radial direction of the pipe. When the annular portions 30 are formed by bending a sheet metal, the welded portion of the sheet metal's end 31 tends to lift towards the outer side RD1 in the radial direction of the pipe. If the welded end 31 of the sheet metal is on the inner side RD2 in the radial direction of the pipe, it becomes easier for the thicker portion of the end 31 to press against the water-stopping rubber on the inner side RD2 in the radial direction of the pipe compared to when it is on the outer side RD1 in the radial direction of the pipe. As shown in Figure 4B, the annular portion 30 has multiple pairs of openings 30s for inserting bolts and nuts. The openings 30s are open facing the outer side RD1 in the radial direction of the pipe and the outer side in the circumferential direction of the pipe. In this embodiment, two pairs of openings 30s are formed, but the number of pairs can be appropriately changed according to the dimension AD in the axial direction of the metal band 3.

[0025] The metal band 3 is made of metal. In this embodiment, SUS is used for the metal band 3. Although not particularly limited, in the case of SUS, the thickness of the sheet metal 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 sheet metal 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 the water-stopping sheet 5 will not be able to be properly compressed. If the thickness of the sheet metal exceeds 1.5 mm, it will be difficult to bend the metal band 3 by hand, and it will be difficult to bend the metal band 3 into a shape that matches the fluid pipe 2.

[0026] As shown in Figures 8A, 8B, and 9, the fastening mechanism 4 includes a rotating shaft 40 that is inserted into the annular portion 30 and rotatable within the annular portion 30, and bolts 41 and nuts 42 that fasten the rotating shafts 40 together. The rotating shafts 40 are configured to rotate around the rotating shaft 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 mounting position of the metal band 3, and even if the curvature of the outer surface of the fluid pipe 2 is any different when using the metal band 3 on various fluid pipes 2 with different diameters, the rotation of the rotating shafts 40 allows only a force parallel to the bolt axis to be applied to the bolts 41 and nuts 42, enabling the metal band 3 to uniformly press the water-stopping sheet 5 over the entire circumference 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 a flat surface without screw threads. The inner diameter of the bolt insertion hole 40s is larger than the outer diameter of the bolt 41.

[0027] As shown in Figures 9 and 10, the rotating shaft 40 is formed in a rod shape. The rotating shaft 40 has a projection 40t that interferes with the metal band 3 and prevents the rotating shaft 40 from falling out of the annular portion 30. The projection 40t protrudes outward in the radial direction of the rotating shaft 40 from the outer circumferential surface 40b of the rotating shaft 40. In the embodiment shown in the figures, the projection 40t protrudes from the outer circumferential surface 40b of the rotating shaft 40, but is not limited to this. As shown in the upper part of Figure 10, in the first rotation position in which the rotating shafts 40 are fastened together with bolts 41 and nuts 42, the projection 40t interferes with the metal band 3 and prevents it from falling out. As shown in the lower part of Figure 10, in the second rotation position which is different from the first rotation position, the projection 40t does not interfere with the metal band 3, and the rotating shaft 40 can be removed from the annular portion 30.

[0028] As shown in Figures 6, 8A, and 8B, a spacer 43 may be attached to the bolt 41. The spacer 43 protrudes radially outward from the bolt shaft 41x beyond the rotation axis 40. Specifically, the spacer 43 has a flange portion 43c, and the flange portion 43c protrudes radially outward from the bolt shaft 41x beyond the rotation axis 40. As a result, the spacer 43 contacts the metal band 3, forming a space SP1 between the nut 42 and the metal band 3 where a tool K for fastening the nut 42 can be placed. The outer diameter of the largest diameter portion (flange portion 43c) of the spacer 43 should 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 axis 40. Moving the nut 42 away from the rotation axis 40 increases the gap between the nut 42 and the metal band 3, making it easier to secure tool space for placing the tool K.

[0029] As shown in Figures 8A and 9, the bolt 41 is a headed bolt having a head 41a at the first end, a threaded groove formed at the 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 restricting groove 41c that engages with the head 41a to restrict the rotation of the bolt 41. The rotation restricting groove 41c is a accommodating groove in which at least a portion of the head 41a of the bolt 41 is embedded. Of course, the rotation restricting groove 41c may completely accommodate the head 41a, or it may be a groove that does not accommodate the head 41a. In this embodiment, the head 41a of the bolt 41 is hexagonal, and correspondingly the rotation restricting groove 41c is a hexagonal recessed groove, but the shapes of the head and the rotation restricting groove can be changed as appropriate. For example, the head 41a may be a T-shaped head.

[0030] As shown in Figures 8A and 9, when preventing the rotation of the head 41a of the bolt 41, or when preventing the rotation of the nut at the first end of a double-threaded bolt, it is preferable to provide a retaining member 44 to prevent the bolt 41 from coming loose at a position opposite to the head 41a or nut that is being prevented from rotating, with the rotation of the rotating shaft 40 in between. The retaining member 44 may be a nut, or it may be an elastic ring such as a rubber or resin O-ring placed inside the bolt insertion hole 40s.

[0031] As shown in Figure 4B, the length L1 of the metal band 3 along the circumferential direction CD of the pipe can be changed as appropriate. In situations where there are various diameter sizes of fluid pipes 2, designing a metal band 3 to match 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 require repair for inner diameters from 300 mm to 700 mm. These include 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 600 mm, and 700 mm. To accommodate these, multiple metal bands 3 can be made with two or three of the three types, each with a length L1 along the circumferential direction CD of 250 mm, 400 mm, or 600 mm. This allows for the handling of seven types of fluid pipes with only three types of inventory, enabling quick response in the event of a leak and reducing inventory costs. Specifically, to accommodate a fluid pipe with an inner diameter of 300 mm, since the outer diameter of the pipe is 318.5 mm, one metal band with an L1 of 400 mm and one metal band with an L1 of 600 mm are required. To accommodate a fluid pipe with an inner diameter of 350 mm, and with an outer diameter of 355.6 mm, two metal bands with an L1=250 mm length and one metal band with an L1=600 mm length are required. To accommodate a fluid pipe with an inner diameter of 400 mm, and with an outer diameter of 406.7 mm, one metal band with an L1=250 mm length, one with an L1=400 mm length, and one with an L1=600 mm length are required. To accommodate a fluid pipe with an inner diameter of 450 mm, and with an outer diameter of 457.2 mm, two metal bands with an L1=400 mm length and one metal band with an L1=600 mm length are required. To accommodate a fluid pipe with an inner diameter of 500 mm, and with an outer diameter of 508.0 mm, one metal band with an L1 of 400 mm and two metal bands with an L1 of 600 mm are needed. To accommodate a fluid pipe with an inner diameter of 600 mm, and with an outer diameter of 609.6 mm, one metal band with an L1 of 250 mm, one metal band with an L1 of 400 mm, and two metal bands with an L1 of 600 mm are needed. To accommodate a fluid pipe with an inner diameter of 700 mm, and with an outer diameter of 711.2 mm, one metal band with an L1 of 400 mm and three metal bands with an L1 of 600 mm are needed.

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

[0033] (2) The configuration may be as shown in Figure 13. As shown in Figure 13, the first rotating shaft 240 on the head 41a side has a head housing groove 241c in which the head 41a is at least partially embedded so that it can rotate relative to the annular portion 30. The head housing groove 241c restricts the rotation of the head 41a, just like 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 outside of the second rotating shaft 340 as the first rotating shaft 240 rotates. The open groove 340c is open radially outside the second rotating shaft 340 and in the axial direction. A retaining washer 45 is installed between the second rotating shaft 340 and the nut 42, which engages with the second rotating shaft 340 and restricts the shaft of the bolt 41 from coming out of the open groove 340c. The retaining washer 45 has a through hole for inserting the shaft of the bolt 41, and an engaging piece 45a at the end of the fluid pipe 2 that is on the inner side RD2 in the radial direction of the pipe, which is bent to engage with the second rotation shaft 340. The engaging piece 45a is positioned in the fastened state to interfere with the second rotation shaft 340 at the inner side RD2 in the radial direction of the second rotation shaft 340.

[0034] (3) Instead of the rotation-restricting groove 41c shown in Figure 9, a rotation-restricting washer 141 may be provided as shown in Figure 14. That is, the rotating shaft 440 is configured to rotate around the rotating shaft C1 within the annular portion 30 of the metal band 3. A rotation-restricting washer 141 is installed between the head 41a of the bolt 41 and the rotating shaft 440, engaging with the head 41a and the rotating shaft 440 to restrict the rotation of the bolt 41. The rotation-restricting washer 141 has a through hole 141h through which the bolt 41 is inserted, a clamping piece 141a that clamps the head 41a, and an interference piece 141b that interferes with the outer circumferential surface of the rotating shaft 440. With this configuration as well, the rotation-restricting washer 141 restricts the rotation of the bolt 41, so fastening is possible by turning only the nut 42, thereby improving work efficiency. Compared to the embodiment shown in Figure 9, it is not necessary to form a rotation-restricting groove 41c on the rotating shaft 440, thus improving convenience. Furthermore, as shown in Figure 14, when the size of the fluid pipe 2 is small (for example, 300 mm in diameter), the spacer 43 shown in Figure 9 is not necessary, and the rotation restricting washer 141 can be used directly on the rotating shaft 440. Also, the angle can be adjusted according to the curvature of the pipe size, as shown by arrow Y1 in Figure 14, and the fastening mechanism 4 can tighten any size pipe uniformly without applying local stress to the metal band 3.

[0035] (4) In the above embodiment, as shown in Figure 3, 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 which is located inward from the first portion P11 in the circumferential direction CD of the pipe. The first portion P11 tends to float outward in the radial direction RD1 of the pipe, so the force pressing down on the watertight sheet 5 is weakened. Therefore, the thickness of the portion of the watertight sheet 5 that contacts the first portion P11 may be greater than the thickness of the portion of the watertight sheet 5 that contacts the second portion P12. In this way, even if the first portion P11 floats more than the second portion P12, the compression force can be adjusted by the difference in thickness of the watertight sheet 5, and the watertight sheet 5 can press down on the fluid pipe 2 uniformly.

[0036] (5) As shown in Figures 15A and 15B, a pressing mechanism 6 may be provided between adjacent metal bands 3 in the circumferential direction CD of the pipe, using the axis of the bolt 41 as a base to press the metal plate 32. The pressing mechanism 6 in this embodiment includes a wedge member 60 that presses the metal plate 32, and a fixing bolt 61 for moving the wedge member 60 in a closing direction and fixing its position. By rotating the fixing bolt 61 to separate the wedge members 60, the wedge member 60 is positioned between the bolt 41 and the metal plate 32, pressing the metal plate 32. Of course, the pressing mechanism 6 is not limited to the wedge type. For example, pressing may be done with a bolt without using a wedge member.

[0037] (6) In the first embodiment, the waterproof sheet 5 is fixed to the metal band 3 by adhesive, but the invention is not limited to this, and the waterproof 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 sheet metal, but it may be formed by other methods.

[0039] (8) The welded end 31 of the sheet metal may be positioned so that RD1 is on the outer side in the radial direction of the pipe.

[0040] (9) As shown in Figure 16, if the outermost rib 53's outer end 53e in the pipe axis direction is located inward AD2 in the pipe axis direction from the outermost rib 53's outer end 3e in the pipe axis direction from the metal band 3, then the outermost rib sheet 5's outer end 53e in the pipe axis direction and the outermost rib 53's outer end 53e in the pipe axis direction may be in the same position. This allows the metal band 3 to suppress the deformation of the outermost rib 53 when the outermost rib 53 attempts to deform outward AD1 in the pipe axis direction due to water pressure, thereby suppressing deformation.

[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-ended 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 screw grooves, but is not limited to this. When using double-threaded bolts, screw grooves may be provided 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) Figure 17 is a cross-sectional view showing the metal band and watertight sheet in a modified fastening state. As shown in Figure 17, when the metal band 3 is fastened by the fastening mechanism 4, the outer end 3e in the pipe axial direction of the metal band 3 may be bent inward RD2 in the radial direction of the fluid pipe 2, more so than the central part 3c in the pipe axial direction. With this configuration, the outer end 5e in the pipe axial direction of the watertight sheet 5 can be compressed more strongly than other parts, making it possible to improve the watertight performance of the outer end 5e in the pipe axial direction of the watertight sheet 5. This bending deformation can be generated by fastening the fastening mechanism 4 because the outermost rib 53e in the pipe axial direction is located inward AD2 in the pipe axial direction than the outer end 3e in the pipe axial direction of the metal band 3. The configuration in which the outer end 3e of the metal band 3 in the axial direction of the pipe is bent inward RD2 in the radial direction of the pipe can also be adopted in the configuration shown in Figure 7, where the outer end 3e of the metal band 3 in the axial direction of the pipe and the outer end 5e of the watertight sheet 5 in the axial direction of the pipe are flush, and the outermost rib 53e in the axial direction of the pipe is located further inward AD2 in the axial direction of the pipe than the outer end 3e of the metal band 3 in the axial direction of the pipe. Furthermore, the configuration in which the outer end 3e of the metal band 3 in the axial direction of the pipe is bent inward RD2 in the radial direction of the pipe can also be adopted in the configuration shown in Figure 16, where the outer end 5e of the watertight sheet 5 in the axial direction of the pipe and the outermost rib 53e in the axial direction of the pipe are flush.

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

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

[0046] The second configuration for suppressing or preventing the occurrence of the defects described in (15) and (13) is as shown in Figure 20, in which the outer end 3e of the metal band 3 in the pipe axis direction protrudes further outward AD1 in the pipe axis direction than the outer end 5e of the watertight sheet 5 in the pipe axis direction. A second recess 56 is formed corresponding to the outer diameter RD1 of the first recess 54 that is the furthest outward AD1 in the pipe axis direction among the multiple first recesses 54, and fixes the watertight sheet 5 and the outer end 35x of the metal band 3 in the pipe axis direction. Fixation can be done by adhesive or lining. The watertight sheet 5 is a hybrid structure in which the hardness of the end region Ar2 in the outer AD1 in the pipe axis direction is higher than the hardness of the inner region Ar3 in the inner AD2 in the pipe axis direction than the hardness of the end region Ar2. The interface Br1 between the end region Ar2 and the inner region Ar3 is located at a position that overlaps with the second first rib 51 from the outer AD1 in the pipe axis direction or at a position in the inner AD2 in the pipe axis direction than the second first rib 51. For example, the interface Br1 may be located between the second first rib 51 and the third first rib 51 from the outer AD1 in the axial direction of the pipe. For example, the rubber hardness of the waterproofing sheet 5 in the end region Ar2 may be made higher than the rubber hardness of the waterproofing 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 greater than 60 degrees and 80 degrees or less. For example, if the rubber hardness of the waterproofing sheet 5 in the end region Ar2 and the inner region Ar3 is the same, a reinforcing layer such as reinforcing cloth or reinforcing fibers may be provided in the waterproofing sheet 5 in the end region Ar2, while no reinforcing layer is provided in the inner region Ar3. The outermost rib 53's outer end 53e in the pipe axis direction may be flush with the outermost rib 53's outer end 53e in the pipe axis direction, or it may be located inward AD2 in the pipe axis direction from the outermost rib 53's outer end 53e in the pipe axis direction. With this configuration, the region AD1 axially outward from the second first rib 51 always becomes the end region Ar2, resulting in high hardness. This prevents the second recess 56 from having an adverse effect, thereby improving water-stopping performance.

[0047] A third configuration for suppressing or preventing the occurrence of the defects described in (16) and (13) is as shown in Figure 21, in which the outer end 3e of the metal band 3 in the pipe axis direction protrudes AD1 further outward in the pipe axis direction than the outer end 5e of the water-sealing sheet 5 in the pipe axis direction. The water-sealing sheet 5 and the outer end 35x of the metal band 3 in the pipe axis direction are fixed together. Fixation can be done by adhesive or lining. Of the multiple first recesses 54, the first recess 54 located furthest outward in the pipe axis direction AD1 does not have a corresponding second recess 56 formed on its outer diameter RD1. With this configuration, it is possible to improve the water-sealing performance while avoiding adverse effects from the second recess 56.

[0048] <Second Embodiment> Hereinafter, a leak repair fitting and repair method of a second embodiment of this disclosure will be described with reference to the drawings. The same reference numerals are used for parts that are the same as in the first embodiment, and their descriptions are omitted. Figure 22 is a plan view showing the assembled state of the metal band 3, water-stopping sheet 5, and fastening mechanism 4 of the second embodiment. Figure 23 is a side view showing the assembled state of the metal band 3, water-stopping sheet 5, and fastening mechanism 4 of the second embodiment. Figure 24 is a plan view, left side view, right side view, and A24-A24 section cross-sectional view of the rotation axis of the second embodiment. Figures 22 and 23 show the leak repair fittings as sold.

[0049] As shown in Figures 22-24, a fastening mechanism 4 is assembled 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 in the second embodiment is a hexagonal nut, but is not limited thereto. The retaining member 544 can be the first embodiment or a modified version thereof. The spacer 43 in the second embodiment is a cylindrical spacer with a constant outer 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 portion 542a corresponding to the flange portion 43c of the spacer 43 in the first embodiment. The flange portion 542a may be a washer, which is a separate component from the nut and spacer.

[0050] As shown in Figure 23, the metal band 3 has a first portion P11 to which the tip 31 of the sheet metal is welded. A waterproof sheet 5 is attached to the metal band 3. One end 5c of the waterproof sheet 5 in the circumferential direction CD is located closer to the tip of the circumferential direction CD than the first portion P11 on the same side of the circumferential direction CD of the metal band 3. The other end 5d of the waterproof sheet 5 in the circumferential direction CD is located closer to the tip of the circumferential direction CD than the first portion P11 on the other side of the circumferential direction CD of the metal band 3. As a result, compared to the first embodiment, the amount by which the waterproof sheet 5 protrudes from the end of the circumferential direction CD of the metal band 3 can be reduced.

[0051] As shown in Figure 23, when a perpendicular line L2 is drawn from the rotation axis C1 of the rotation axis 540 to the inner surface of the annular portion 30 of the metal band 3 in the radial direction, the portion P13 of the water-sealing sheet 5 on the tip side of the circumferential direction CD relative to the perpendicular line L2 may have a higher rubber hardness than the portion P14 of the water-sealing sheet 5 on the inner side of the circumferential direction CD relative to the perpendicular line L2. In the second embodiment, the rubber hardness of portion P13 of the water-sealing sheet 5 is 80 degrees, and the rubber hardness of portion P14 of the water-sealing sheet 5 is 60 degrees. If the rubber hardness of the entire water-sealing sheet 5 is 60 degrees, the intermediate portion 5f between the first portion P11 and the first portion P11 of the water-sealing sheet 5 can easily conform to the irregularities of the fluid pipe and adhere closely, which is preferable. However, when the waterproof sheet 5 comes into contact with the fluid pipe, a force acts to advance it toward the tip end 5d where there is no metal plate 32 due to the tightening. However, if the rubber hardness is 60 degrees, the rubber tip portion where there is no metal plate 32 may bend, making it difficult to adhere tightly to the pipe. On the other hand, if the rubber hardness of part P13 is set to 80 degrees, the waterproof sheet 5 will advance more easily toward the tip end, improving the adhesion between the fluid pipe and the waterproof sheet 5. The rubber hardness of the intermediate part 5f is set to 60 degrees to allow it to follow the fluid pipe. Regarding the rubber hardness of part P14, if the rubber hardness of the intermediate part 5f between the first part P11 and the first part P11 is 60 degrees, then the rubber hardness of the tip end 5c beyond the first part P11 may be 60 degrees, 80 degrees, or any hardness between 60 and 80 degrees. When the rubber hardness of the waterproofing sheet 5 is to be different in the end region Ar2 and the inner region Ar3 as shown in Figure 20, the relationship of the rubber hardness may be either [1] or [2] below. [1] Region P13 ≥ End region Ar2 of region P14 > Inner region Ar3 of region P14 [2] Region P13 = End region Ar2 of region P14 > Inner region Ar3 of region P14

[0052] As shown in Figure 24, the rotating shaft 540 of the second embodiment may have a projection 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 projection 540t is located axially inward from both ends of the rotating shaft 540 in the axial direction. This makes it possible to arrange multiple metal bands 3 adjacent to each other without gaps along the axial direction of the fluid tube. The function of preventing detachment by the projection 540t is the same as in Figure 10, where the projection 540t interferes with the annular portion 30 to prevent the rotating shaft 540 from falling off in the first rotation position, and the interference between the projection 540t and the annular portion 30 is released in the second rotation position, allowing for attachment and detachment.

[0053] In the second embodiment, the projection 540t of the rotating shaft 540 may protrude from the outer circumferential surface 40b toward the tip (41b) side of the bolt 41 of the rotating shaft 540. This allows the outer circumferential surface 40b on the tip side of the bolt 41 of the rotating shaft 540 to come into close contact with the annular portion 30 due to the weight of the nut 542 attached to the bolt 41, thereby making it easier to prevent the rotating shaft 540 from falling off.

[0054] As shown in Figure 22, the projection 540t protrudes from the outer circumferential surface 40b of the rotating shaft 540 when the fastening mechanism 4 is fastened. Also, the projection 540t is located inside the circumferential CD of the metal band 3 beyond the outer end 30a of the circumferential CD of the metal band 3. If the projection 540t does not protrude from the outer end 30a of the circumferential CD of the metal band 3, the projection 540t and the outer end 30a may be flush. This allows the rotating shaft 540 to be attached to and detached from the metal band 3 when in the second rotation position, and prevents the rotating shaft 540 from falling off the metal band 3 when in the first rotation position, and prevents the projections 540t from directly contacting each other even when the metal bands 3 are close enough to touch each other. As shown in Figure 24, the rotating shaft 540 has a recess on the tip (41b) side of the bolt 41, and 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 surface 540a. The projection 540t may be made of sheet metal and welded to the surface 540b.

[0055] As shown in Figure 22, the rotating shaft 540 has a rotation restricting groove 541c, and the rotation restricting groove 541c has two surfaces that intersect both the rotation axis C1 of the rotating shaft 540 and the surface perpendicular to the rotation axis C1. The two surfaces are parallel to each other. These surfaces may be inclined at 60 degrees with respect to the rotation axis C1, or at 30 degrees with respect to the 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 rotating shaft 540, and further miniaturization of the diameter R1 of the rotating shaft 540 becomes possible. If the diameter R1 of the rotating shaft 540 becomes smaller, the distance between the bolt shaft 41x and the fluid pipe shown in Figure 23 becomes shorter, allowing for appropriate pressing. This is because if the distance between the bolt shaft 41x and the fluid pipe becomes larger, a force acts on the first part P11 to try to stand up outward in the radial direction of the pipe, causing the force to dissipate.

[0056] The leak repair fitting of the first or second embodiment may be assembled as shown in Figure 25. The example shown in Figure 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 is effective when there are many places where water leakage W occurs. As shown in the upper part of the figure, the first metal band 3 (left side in the figure) and the water-stopping sheet 5 are placed on the fluid pipe 2 and the fastening mechanism 4 is fastened. In the example in the figure, water leakage W is still occurring. Furthermore, the second metal band 3 (right side in the figure) and the water-stopping sheet 5 are placed adjacent to the first metal band 3 and temporarily fastened with the fastening mechanism 4. A string-like rubber 7 is wrapped between the first metal band 3 and the second metal band 3, and the ends 7a of the string-like rubber 7 are bonded together with adhesive to form an endless ring. In the example in Figure 25, the cross-section of the string-like rubber 7 is circular, but the shape can be changed in various ways. Next, the string-shaped rubber 7 and the second metal band 3 are moved toward the first metal band 3, compressing the string-shaped rubber 7 by sandwiching it between the first and second metal bands 3, and then the second metal band 3 is fastened and secured 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 axial direction of the pipe are made to protrude further outward in the axial direction of the pipe than the outer ends of the water-stopping sheet 5 in the axial direction of the pipe. As a result, the outer ends of the first and second metal bands 3 in the axial direction of the pipe hold the string-shaped rubber 7, thereby improving the water leakage prevention performance.

[0057] The leak repair fitting of the first or second embodiment may be assembled as shown in Figure 26. The example shown in Figure 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 leak W occurs near the structure 20 on the fluid pipe 2. As shown in the upper part of the figure, the metal band 3 and the waterproof sheet 5 are placed on the fluid pipe 2 and the fastening mechanism 4 is temporarily fastened. The string-shaped rubber 7 is wrapped between the metal band 3 and the structure 20, and the string-shaped rubber 7 is bonded with adhesive to form an annular rubber. Next, the metal band 3 is moved toward the structure 20, the string-shaped rubber 7 is sandwiched between the metal band 3 and the structure 20 and compressed, and the metal band 3 is fastened and fixed with the fastening mechanism 4. The compression of the rubber is the same as in Figure 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, so that the leak prevention performance can be improved.

[0058] As described above, although not particularly limited, as in the first embodiment, the leak repair fitting 1 is a leak repair fitting that is attached to the leak portion 2x of the fluid pipe 2, and comprises a plurality of metal bands 3 provided at intervals in the circumferential direction CD of the fluid pipe 2, a water-stopping sheet 5 provided on the inner circumferential surface 3a of each of the plurality of metal bands 3, made of an elastic material, which seals the space between the metal band 3 and the outer circumferential surface 2b of the fluid pipe 2, and a fastening mechanism 4 which fastens the circumferential ends of the plurality of metal bands 3 together, The inner circumferential surface 5a of the water sheet 5 has a plurality of first ribs 51 extending in the circumferential direction CD of the pipe, a plurality of second ribs 52 extending in the axial direction AD of the pipe, and a plurality of first recesses 54, each of which is formed by being closed by the plurality of first ribs 51 and the plurality of second ribs 52, and the outermost rib 53 of the plurality of first ribs 51 that is located in the axial direction AD1 may be located in the axial direction AD2 than the outermost rib 3e of the metal band 3 in the axial direction.

[0059] The fastening mechanism 4 tightens the multiple metal bands 3, compressing the watertight sheet 5. Multiple closed first recesses 54 are formed on the inner circumferential surface 5a of the watertight sheet 5. The first recesses 54 are formed by a first rib 51 extending in the circumferential direction CD and a second rib 52 extending in the axial direction AD. The first rib 51 tries to escape outwards AD1 in the axial direction due to water leakage. This is particularly noticeable in the outermost rib 53, which is the outermost rib AD1 in the axial direction among the multiple first ribs 51. Since the outermost end 53e in the axial direction of the outermost rib 53 is positioned inwards AD2 in the axial direction of the pipe compared to the outermost end 3e of the metal band 3 in the axial direction of the pipe, even if the outermost rib 53 tries to escape outwards AD1 in the axial direction of the pipe, the metal band 3 can hold down the outermost rib 53, preventing water leakage due to deformation of the outermost rib 53.

[0060] Although not particularly limited, as in the embodiment shown in Figure 17, when the metal band 3 is fastened by the fastening mechanism 4, the outer end 3e in the pipe axial direction of the metal band 3 may be bent inward RD2 in the radial direction of the fluid pipe 2 more than the central part 3c in the pipe axial direction. With this configuration, the outer end 5e in the pipe axial direction of the water-sealing sheet 5 can be compressed more strongly than other parts, making it possible to improve the water-sealing performance of the outer end 5e in the pipe axial direction of the water-sealing sheet 5.

[0061] Although not particularly limited, as in the first embodiment, the outermost rib 53 located furthest outward AD1 among the multiple first ribs 51 may be positioned inward AD2 in the pipe axis direction than the outermost end 5e

[0062] Although not particularly limited, as in the first embodiment, the outer surface 5b of the water-stopping sheet 5 may have second recesses 56 corresponding to each of the first recesses 54, 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] With this configuration, the second recess formed on the outer surface 5b of the watertight sheet 5 is located only within the range Ar1 that overlaps with the first recess 54, and the second recess is not located in a position that overlaps with the first rib 51 and the second rib 52. Therefore, the watertight effect caused by the first rib 51 and the second rib 52 properly pressing against the outer surface 2b of the fluid pipe 2 is not impaired. Furthermore, since the second recess 56 is located on the outer side of the first recess 54, even if the first recess 54 is filled with water leakage, it is possible to deform the portion P1 of the watertight sheet 5 between the first recess 54 and the second recess 56 outward in the radial direction of the pipe RD1. This deformation allows the watertight sheet 5 to be compressed even when the first recess 54 is filled with water, avoiding compression obstruction due to water leakage, and enabling the watertight sheet 5 to be properly 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-stopping sheet 5, the volume of each second recess (56) may be greater than or equal to the volume change when one first recess 54 is compressed by 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, and enables the water-stopping sheet 5 to be compressed appropriately.

[0065] While not particularly limited, as in the embodiment shown in Figure 19, the outer end 3e of the metal band 3 in the pipe axis direction protrudes AD1 further outward in the pipe axis direction than the outer end 5e of the water-sealing sheet 5 in the pipe axis direction, and a second recess 56 is formed that corresponds to the outer diameter RD1 of the first recess 54 that is furthest outward in the pipe axis direction AD1 among a plurality of first recesses 54, and the outer end 35x of the metal band 3 in the pipe axis direction is fixed to the water-sealing sheet 5, and the water-sealing sheet 5 is made of rubber, and the rubber hardness of the water-sealing sheet 5 is 60 degrees or more and 80 degrees or less. With this configuration, it is possible to improve the water-sealing performance by avoiding adverse effects from the second recess 56 that is furthest outward in the pipe axis direction AD1.

[0066] While 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 outward AD1 in the pipe axis direction more than the outer end 5e of the water-sealing sheet 5 in the pipe axis direction, and a second recess 56 is formed that corresponds to the outer diameter RD1 of the first recess 54 that is the furthest outward AD1 in the pipe axis direction among a plurality of first recesses 54, and the outer end 35x of the metal band 3 in the pipe axis direction is fixed to the water-sealing sheet 5, and the water-sealing sheet 5 has a hybrid structure in which the hardness of the end region Ar2 in the outer AD1 in the pipe axis direction is higher than the hardness of the inner region Ar3 in the inner AD2 in the pipe axis direction than the hardness of the end region Ar2, and the interface Br1 between the end region Ar2 and the inner region Ar3 may be located at a position that overlaps with the second first rib 51 counting from the outer AD1 in the pipe axis direction or at a position in the inner AD2 in the pipe axis direction than the second first rib 51. With this configuration, the region AD1 axially outward from the second first rib 51 always becomes the end region Ar2, resulting in high hardness. This prevents the second recess 56, located furthest axially outward in AD1, from having an adverse effect, thereby improving water-sealing performance.

[0067] While not particularly limited, as in the embodiment shown in Figure 21, the outer end 3e of the metal band 3 in the pipe axis direction protrudes AD1 further outward in the pipe axis direction than the outer end 5e of the water-sealing sheet 5 in the pipe axis direction. The outer end 35x of the metal band 3 in the pipe axis direction is fixed to the water-sealing sheet 5. Fixation can be done by adhesive or lining. Of the multiple first recesses 54, the first recess 54 located furthest outward in the pipe axis direction AD1 does not have a corresponding second recess 56 formed on its outer diameter RD1. With this configuration, it is possible to improve water-sealing performance while avoiding adverse effects from the second recess 56.

[0068] Although not particularly limited, as in the first embodiment, the metal band 3 has annular portions 30 formed at both ends of the circumferential CD direction of the pipe by bending a sheet metal and welding the ends 31 on both sides of the circumferential CD direction of the sheet metal to the sheet metal, the fastening mechanism 4 has a rotating shaft 40 that is inserted through the annular portion 30 and rotatable within the annular portion 30, and bolts 41 and nuts 42 that fasten the rotating shafts 40 together, and the metal band 3 may be positioned such that the welded ends 31 of the sheet metal are on the inside RD2 direction of the pipe diameter.

[0069] When the sheet metal is bent to form the annular portion 30, the welded portion (P11) of the tip 31 of the sheet metal tends to lift outwards towards the outer diameter RD1 of the pipe. As in this embodiment, if the tip 31 of the welded sheet metal is on the inner diameter RD2 of the pipe, it becomes easier for the thicker portion of the tip 31 to press against the water-stopping sheet 5 on the inner diameter RD2 of the pipe, compared to when it is on the outer diameter RD1 of the pipe, thus suppressing a decrease in the water-stopping effect.

[0070] Although not particularly limited, as in the modified version of the first embodiment, the metal band 3 has annular portions 30 formed at both ends of the circumferential CD direction of the pipe by bending a sheet metal and welding the ends 31 on both sides of the sheet metal in the circumferential CD direction to the sheet metal, the fastening mechanism 4 has a rotating shaft 40 that is inserted through 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 ends 31 of the sheet metal are welded, and a second portion P12 that is inward in the circumferential direction of the pipe from the first portion P11, and the thickness of the portion of the water-stopping sheet 5 that contacts the first portion P11 may be greater than the thickness of the portion of the water-stopping sheet 5 that contacts the second portion P12.

[0071] When the sheet metal is bent to form the annular portion 30, the welded portion (P11) at the tip 31 of the sheet metal tends to lift outwards towards the outer diameter RD1 of the pipe. As in this embodiment, the thickness of the portion of the waterproofing sheet 5 that contacts the first portion P11 is greater than the thickness of the portion that contacts the second portion P12, which is further inward in the circumferential direction of the pipe than the first portion P11. By increasing the thickness of the waterproofing sheet 5, it is possible to suppress a localized decrease in the waterproofing effect at the first portion P11.

[0072] Although not particularly limited, as shown in the embodiments in Figures 9 to 12, the metal band 3 has annular portions 30 at both ends in the circumferential direction CD of the pipe, and the fastening mechanism 4 has a rotating shaft (40, 140) inserted through the annular portion 30 and rotatable within the annular portion 30, and a bolt 41 and a nut 42 for fastening the rotating shafts (40, 140) together, and the rotating shafts (40, 140) have projections (40t, 140t) that interfere with the metal band 3 to prevent the rotating shafts (40, 140) from falling out of 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 projections (40t, 140t) interfere with the metal band 3 to prevent falling out, and in a second rotational position different from the first rotational position, the projections (40t, 140t) do not interfere with the metal band 3 and the rotating shafts (40, 140) can be removed from the annular portion 30.

[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 shafts (40, 140) allows the bolts 41 and nuts 42 to be positioned appropriately for fastening, thereby increasing the fastening force of the metal band 3. Moreover, since the rotating shafts (40, 140) are provided with projections (40t, 140t) that prevent detachment, only the second rotation position is required for attachment and detachment, and detachment is prevented in the first rotation position, thus suppressing or preventing detachment during work and making construction work easier.

[0074] While not particularly limited, as in the first embodiment, the rotating shaft 40 may have a bolt insertion hole 40s through which a bolt 41 is inserted, and the inner surface of the bolt insertion hole 40s may be a flat surface without screw threads. This eliminates the need to remove the rotating shaft 40 when it is necessary to change the orientation of the bolt 41 due to surrounding obstacles, as the inner surface of the bolt insertion hole 40s is a flat surface without screw threads. The bolts can be replaced one by one in sequence, eliminating the need to dismantle the temporary assembly of the metal band 3, and thus preventing the rotating shaft from falling out and thus preventing its loss. This is particularly preferable when installing on a water pipe bridge with a river below.

[0075] Although not particularly limited, as in the first embodiment, the metal band 3 has annular portions 30 at both ends in the circumferential direction CD of the pipe, and the fastening mechanism 4 has a rotating shaft 40 that is inserted through 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, and a spacer 43 that protrudes radially from the rotating shaft 40 in the direction of the bolt shaft 41x is attached to the bolt 41, and the spacer 43 contacts the metal band 3 so that 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. This configuration makes it possible to avoid losing the space SP1 for positioning the tool K between the nut 42 and the metal band 3, thereby improving work efficiency.

[0076] Although not particularly limited, as shown in the embodiments in Figures 8A and 9, the metal band 3 has annular portions 30 at both ends in the circumferential direction CD of the pipe, and the fastening mechanism 4 has a rotating shaft 40 that is inserted through 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 bolt 41 is a headed bolt having a head 41a at the first end and a nut 42 attached to the second end 41b, and the rotating shaft 40 on the head 41a side has a rotation restricting groove 41c that engages with the head 41a and restricts the rotation of the bolt 41. As a result, the rotation of the bolt 41 is restricted by the rotation-restricting groove 41c formed on the rotating shaft 40, so fastening can be done simply by tightening the nut 42, thereby improving work efficiency.

[0077] Although not particularly limited, as shown in the embodiment in Figure 13, the metal band 3 has annular portions 30 at both ends in the circumferential direction CD of the pipe, and the fastening mechanism 4 has a rotating shaft (240, 340) inserted through 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 is a headed bolt having a head 41a at the first end and a nut 42 attached to the second end 41b, and the first rotating shaft 2 is on the head 41a side The bolt 40 has a head-receiving groove 241c into 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 radially outer side of the second rotating shaft 340 as the first rotating shaft 240 rotates, and 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 prevent the shaft of the bolt 41 from coming out of the open groove 340c. With this configuration, the bolt 41 and nut 42 are attached to the fluid pipe 2 before the leak repair fitting 1 is attached, and the leak repair fitting 1 can be attached to the fluid pipe 2 without removing the nut 42. Therefore, it is possible to prevent the loss of components that make up the fastening mechanism 4, such as nuts, by dropping them into the river or other locations at the site.

[0078] Although not particularly limited, as shown in the embodiment in Figure 14, the metal band 3 has annular portions 30 at both ends in the circumferential direction CD of the pipe, and the fastening mechanism 4 has a rotating shaft 440 that is inserted through 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 440 together, and the bolt 41 is a headed bolt having a head 41a at the first end and a nut 42 attached to the second end 41b, and a rotation restricting washer 141 that engages with the head and the rotating shaft 440 to restrict the rotation of the bolt 41 is attached between the head 41a and the rotating shaft 440. With this configuration, the rotation of the bolt 41 is restricted by the rotation-restricting washer 141, so fastening can be achieved simply by tightening the nut 42, thereby improving work efficiency.

[0079] Although not particularly limited, as shown in the embodiments in Figures 15A and 15B, the metal band 3 has annular portions 30 at both ends in the circumferential direction CD of the pipe, the fastening mechanism 4 has a rotating shaft 40 inserted through the annular portion 30 and rotatable within the annular portion, and bolts 41 and nuts 42 fastening the rotating shafts 40 together, and between adjacent metal bands 3 in the circumferential direction CD of the pipe, there may be a metal plate 32 arranged on the outer circumference of the water-stopping sheet 5 and a pressing mechanism 6 that presses the metal plate 32 using the shafts of the bolts 41 as a base. This configuration allows for increased tightening force on the metal plate 32, which is weaker than the metal band 3 in holding down the waterproof sheet 5, thereby improving waterproofing performance.

[0080] Although not particularly limited, as in the first embodiment, the multiple metal bands 3 may have two or three types of bands with lengths L1 along the circumferential direction CD of the tube of 250 mm, 400 mm, and 600 mm. This configuration allows for the use of seven different sizes of fluid pipes—300mm, 350mm, 400mm, 450mm, 500mm, 600mm, and 700mm—by combining two of the three types of metal bands, enabling a reduction in inventory while also allowing for emergency leak response.

[0081] Although embodiments of this disclosure have been described above with reference to the drawings, it should be understood that the specific configurations are not limited to these embodiments. The scope of this disclosure is indicated not only by the description of the embodiments above but also by the claims, and further includes all modifications within the meaning and scope equivalent to the claims.

[0082] The structures adopted in each of the above embodiments can be adopted in any other embodiment. The specific configuration of each part is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of this 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 Ring section 4 Fastening mechanism 40, 140, 240, 340, 440 Rotation axis 40t,140t protrusion 41 volts 42 nuts 43 Spacers 44 Retaining 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 method for repairing leaks in water pipes, The first step involves arranging multiple metal bands, each with a water-stopping sheet made of an elastic material on its inner surface, at positions offset in the direction of the pipe axis from the water leak, and temporarily fastening the ends of adjacent metal bands together using a fastening mechanism. A second step is performed after the first step, in which the metal band and the water-stopping sheet are shifted in the direction of the pipe axis and moved to a position that covers the leaking portion. A third step involves fastening the aforementioned fastening mechanism to reduce the diameter between the plurality of metal bands and pressing the water-stopping sheet against the outer surface of the water pipe to compress it, Leak repair methods, including [specific method / technique].

2. The method for repairing a water leak according to claim 1, further comprising the step of bending the metal band to a shape that matches the water pipe before the first step.

3. A leak repair fitting that is attached to the leaking part of a water pipe, Multiple metal bands are provided at intervals in the circumferential direction of the water pipe, A water-sealing sheet is provided on the inner circumferential surface of each of the plurality of metal bands, is made of an elastic material, and seals the space between the metal band and the outer circumferential surface of the water pipe. The system includes a fastening mechanism for fastening the ends of the plurality of metal bands in the circumferential direction of the pipe together, The inner circumferential surface of the watertight 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 aforementioned plurality of first recesses is formed by being closed by the plurality of first ribs and the plurality of second ribs, The outermost rib, which is the outermost rib in the axial direction of the tube among the plurality of first ribs, has its outermost end in the axial direction located inward in the axial direction compared to the outermost end of the metal band in the axial direction. A leak repair fitting in which the aforementioned water-stopping sheet and the aforementioned metal band are bonded together.

4. A leak repair fitting that is attached to the leaking part of a water pipe, Multiple metal bands are provided at intervals in the circumferential direction of the water pipe, A water-sealing sheet is provided on the inner circumferential surface of each of the plurality of metal bands, is made of an elastic material, and seals the space between the metal band and the outer circumferential surface of the water pipe. The system includes a fastening mechanism for fastening the ends of the plurality of metal bands in the circumferential direction of the pipe together, The aforementioned metal band has annular portions at both ends in the circumferential direction of the tube, The fastening mechanism comprises a rotating shaft inserted through the annular portion and rotatable within the annular portion, and a bolt and nut for fastening the rotating shafts together. The rotating shaft has an arc-shaped outer surface and a projection that protrudes radially outward from the outer surface of the rotating shaft, and is configured such that the projection can interfere with the metal band and prevent the rotating shaft from falling out of the annular portion. A leak repair fitting is configured such that, in a first rotational position in which the rotating shafts are fastened together with the bolt and nut, the projection interferes with the metal band to prevent it from falling off, and in a second rotational position different from the first rotational position, the projection does not interfere with the metal band, allowing the rotating shaft to be removed from the annular portion.

5. The leak repair fitting according to claim 3 or 4, wherein the plurality of metal bands have three different lengths along the circumferential direction of the pipe.

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