Leak repair device and leak repair method

Abstract

To provide a leakage repair device which can surely repair water leakage from a fluid leakage region of a fluid pipe by a simple structure, and can efficiently perform leakage repair work at a low cost.SOLUTION: A leakage repair device 10 for repairing water leakage from a fluid leakage region of a fluid pipe 6 includes: a plurality of divided support bodies 20 which can be externally fit to the fluid pipe 6 from the outside in a pipe diameter direction; a plurality of divided cutoff bands 30 which can be pushed to the fluid leakage region from the outside in the pipe diameter direction with respect to the fluid pipe 6; and a push body 40 assembled to the plurality of divided support bodies 20, pushing the plurality of divided cutoff bands 30 to an external peripheral face of the fluid pipe 6, and repairing water leakage from the fluid leakage region.SELECTED DRAWING: Figure 3

Description

Technical Field

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[0001] The present invention relates to a leakage repair device and a leakage repair method for repairing water leakage from a fluid leakage site of a fluid pipe.

Background Art

[0002] Conventionally, in an existing fluid pipe such as a water pipe, when fluid leaks due to various reasons such as poor jointing or cracks, a leakage repair device having a cylindrical case body is used to repair the leakage site.

[0003] For example, as a leakage repair device, as described in Patent Documents 1 and 2, a device for repairing a leakage site of an existing fluid pipe such as a water pipe is known. This leakage repair device seals the periphery of the leakage site with a cylindrical case body, thereby preventing the leakage of fluid.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In such a conventional leakage repair device, the cylindrical case body is composed of a pair of split pieces, and the ends of these split pieces are connected to form an annular sealed space along the circumferential direction around the water pipe, thereby preventing the leakage of fluid. In such a leakage repair device, there are disadvantages such as the sealing structure between the pair of split pieces being complicated and it being difficult to simply and surely close the pair of split pieces.

[0006] This invention has been made in view of the above circumstances, and its purpose is to provide a leak repair device and leak repair method that have a simple structure, can reliably repair water leaks from the fluid leak point of a fluid pipe, and can carry out leak repair work efficiently and at low cost. [Means for solving the problem]

[0007] In order to solve the aforementioned problems and achieve the objective, this invention is configured as follows.

[0008] The invention described in claim 1 is, This is a leak repair device that repairs water leaks from fluid leak points in fluid pipes. A plurality of segmented support members that can be externally fixed to the fluid tube from the radially outward direction, A plurality of segmented watertight strips that can be pressed against the fluid leakage site on the fluid pipe from the radially outward direction, A pressing body assembled to the plurality of divided support bodies, which presses the plurality of divided water-stopping strips against the outer surface of the fluid pipe to repair water leakage from the fluid leakage site, Includes, The plurality of divided supports are, A pipe fixing portion is fixed to the fluid pipe from the radially outward direction, Located outside the fluid leakage area, a support portion to which the divided water-stopping band and the pressing body can be assembled, A connecting portion that connects the pipe fixing portion and the support portion at multiple positions, This is a leak repair device characterized by including [a certain element].

[0009] The invention described in claim 2 is, The aforementioned plurality of segmented water-blocking zones are A band along the outside of the fluid tube, The leak repair device according to claim 1, characterized in that it includes a sealing portion provided in the band portion for repairing water leakage from the fluid leakage point of the fluid pipe.

[0010] The invention described in claim 3 is, The aforementioned band portion is The fluid tube has multiple nut portions located along the outside of it, The pressing body includes a plurality of bolts, The leak repair device according to claim 2, characterized in that the rotation of the bolt presses the seal portion against the outer surface of the fluid pipe via the nut portion.

[0011] The invention described in claim 4 is, The aforementioned sealing portion includes a rubber seal, The leak repair device according to claim 2, characterized in that the rubber seal has an uneven surface that is pressed against the outer surface of the fluid pipe. 。

[0012] The invention according to claim 5 is a leakage repair method for repairing water leakage from a fluid leakage site of a fluid pipe, using the leakage repair device according to any one of claims 1 to 4, a plurality of split water stop bands that can be pressed against the fluid leakage site of the fluid pipe from the outside in the pipe diameter direction, These multiple segmented water barriers and a pressing body that presses the above against the outer peripheral surface of the fluid pipe, and an assembling step of assembling them to a plurality of split support bodies, the plurality of split support bodies can be externally fixed to the fluid pipe from the outside in the pipe diameter direction, and an installation step of externally fixing the fluid pipe by assembling the plurality of split support bodies, a leakage repair step of pressing the plurality of split water stop bands against the outer peripheral surface of the fluid pipe by the pressing body to repair water leakage from the fluid leakage site, and is characterized by including the above, and is a leakage repair method.

Effects of the Invention

[0016] With the above configuration, this invention has the following effects

[0017] Claim 1 to 4 In the invention described in, it includes a plurality of split water stop bands that can be pressed against the fluid leakage site of the fluid pipe from the outside in the pipe diameter direction, a plurality of split support bodies that can be externally fixed to the fluid pipe from the outside in the pipe diameter direction, and a pressing body provided on the plurality of split support bodies for pressing the plurality of split water stop bands against the outer peripheral surface of the fluid pipe to repair water leakage from the fluid leakage site. It has a simple structure and can surely repair water leakage from the fluid leakage site of the fluid pipe, and the leakage repair work can be efficiently carried out at low cost. <00​​​The invention described above includes an assembly step of assembling a plurality of segmented water-stopping strips, which can be pressed against the fluid leak site on the fluid pipe from the radially outward direction, and a pressing body that presses the segmented water-stopping strips against the outer surface of the fluid pipe, onto a plurality of segmented support bodies; an installation step of assembling the plurality of segmented support bodies and fixing them to the fluid pipe from the radially outward direction, and a leak repair step of pressing the plurality of segmented water-stopping strips against the outer surface of the fluid pipe with the pressing body to repair the water leak from the fluid leak site. This invention has a simple structure and can reliably repair water leaks from the fluid leak site of the fluid pipe, and leak repair work can be carried out efficiently and at low cost. [Brief explanation of the drawing]

[0020] [Figure 1] This is a side view showing the pipeline structure. [Figure 2] This is a side view of a leak repair device. [Figure 3] This is a plan view of a leak repair device. [Figure 4] This is a cross-sectional view along the line IV-IV in Figure 2. [Figure 5] This is a cross-sectional view along the VV line in Figure 2. [Figure 6] This is a diagram showing a divided support structure. [Figure 7] This is a diagram showing a divided water barrier. [Figure 8] This is a diagram showing a rubber seal. [Figure 9] This figure shows another embodiment of the rubber seal. [Figure 10] This is a diagram of a bolt. [Figure 11] Cross-sectional view of the leak repair area. [Figure 12] This is a diagram illustrating the process for the first leak repair method. [Figure 13] This is a process diagram for the second leak repair method. [Modes for carrying out the invention]

[0021] The following describes embodiments of the leak repair device and leak repair method of this invention. These embodiments represent preferred forms of the leak repair device and leak repair method, but the invention is not limited thereto.

[0022] [Pipe structure] The pipeline structure in which this leak repair device is installed will be explained based on Figure 1. Figure 1 is a side view showing the pipeline structure.

[0023] In this embodiment of the pipeline structure, a metal flange plate 4 is provided on the flange 2 at the upper end of a branch pipe 1a extending upward from the main fluid pipe 1. This flange plate 4 is fixedly connected to the flange 2 of the branch pipe 1a by multiple sets of bolts and nuts 5 arranged at predetermined intervals in the circumferential direction of the pipe. In the piping equipment 3, multiple reinforcing ribs 7 are provided between the flange plate 4 and the side surface of the fluid pipe 6.

[0024] In this embodiment, the fluid pipe 6 is a ductile cast iron pipe that constitutes a water pipe for transporting tap water (water supply), which is an example of a fluid. However, other cast iron pipes, steel pipes, resin pipes, etc., can be used. In addition to tap water, other fluids such as industrial water and gases can also be used.

[0025] In this pipeline structure, if fluid leakage occurs due to corrosion or other reasons at a location between the reinforcing ribs 7 of the fluid pipe 6, leak repair is performed by sealing and covering the fluid leakage point X of the fluid pipe 6. The leak repair device and leak repair method of this embodiment have a simple structure, can reliably repair water leakage from the fluid leakage point X of the fluid pipe 6, and can carry out leak repair work efficiently and at low cost. This leak repair device and leak repair method will be described in detail below.

[0026] [Leak repair device] The leak repair device of this embodiment will be described with reference to Figures 2 to 11. Figure 2 is a side view of the leak repair device, Figure 3 is a plan view of the leak repair device, Figure 4 is a cross-sectional view along line IV-IV in Figure 2, Figure 5 is a cross-sectional view along line VV in Figure 2, Figure 6 shows a divided support, Figure 7 shows a divided watertight band, Figure 8 shows a rubber seal, Figure 9 shows another embodiment of the rubber seal, Figure 10 shows a bolt, and Figure 11 is a cross-sectional view of the leak repair section.

[0027] This leak repair device 10 repairs water leakage from a fluid leak site X in a fluid pipe 6, and includes a plurality of segmented support bodies 20 that can be externally fixed to the fluid pipe 6 from the radially outward direction, a plurality of segmented water-stopping strips 30 that can be pressed against the fluid leak site X in the fluid pipe 6 from the radially outward direction, and a pressing body 40 that is assembled to the plurality of segmented support bodies 20 and presses the plurality of segmented water-stopping strips 30 against the outer surface of the fluid pipe 2 to repair water leakage from the fluid leak site X.

[0028] In this embodiment, the leaking fluid pipe 6 is a short steel flanged pipe with reinforcing ribs 7, and the multiple divided support members 20 are composed of split frames. The split frames of the multiple divided support members 20 are set on the fluid pipe 6 in an annular shape so as not to interfere with the reinforcing ribs 7, and the divided water-stopping strips 30 attached to the four directions of the split frames are pressed against the outer surface of the fluid pipe 2 by a pressing body 40 so that they converge from the circumferential direction to the axial direction of the pipe, thereby repairing the water leakage from the fluid leakage point X.

[0029] (Multiple divided supports) Multiple divided supports 20 of this embodiment are shown in Figure 6, where Figure 6(a) is a plan view of the divided support, Figure 6(b) is a view from the direction of arrow b in Figure 6(a), Figure 6(c) is a view from the direction of arrow c in Figure 6(a), Figure 6(d) is a view from the direction of arrow d in Figure 6(a), and Figure 6(e) is a view from the direction of arrow e in Figure 6(a).

[0030] Each of the multiple divided support members 20 includes a pipe fixing portion 21 fixed to the fluid pipe 6 from the radially outward direction, a support portion 22 located outside the fluid leakage area X to which the divided water-stopping band 30 and the pressing body 40 can be assembled, and a connecting portion 23 that connects the pipe fixing portion 21 and the support portion 22 at multiple positions.

[0031] The multiple divided support members 20 are formed from a two-part frame, with the pipe fixing section 21 and support section 22 being centered frames, and the connecting section 23 being composed of L-shaped vertical ribs. The L-shaped vertical ribs of this connecting section 23 are arranged along the outward direction in the diameter of the pipe and are connected to the pipe fixing section 21 and support section 22 at two points, resulting in a structure in which the divided support members 20 are highly accurate and robust.

[0032] Three nuts 24 are fixed to the support portion 22 at five positions in the circumferential direction of the pipe when viewed from above, along the direction of the pipe axis. Flanges 21a are formed at both ends of the pipe fixing portion 21, and flanges 22a are formed at both ends of the support portion 22. The split support body 20, formed from a two-part frame, can be easily installed by aligning the flanges 21a of the pair of pipe fixing portions 21 and the flanges 22a of the pair of support portions 22 and fastening them together with bolts and nuts 25 and 26.

[0033] (Multiple divided water barriers) Multiple segmented water-blocking strips 30 in this embodiment are shown in Figure 7, where Figure 7(a) is a plan view of the segmented water-blocking strip, Figure 7(b) is a view from the direction of arrow b in Figure 7(a), Figure 7(c) is a view from the direction of arrow c in Figure 7(a), and Figure 7(d) is a view from the direction of arrow d in Figure 7(a).

[0034] The multiple segmented water-stopping strips 30 include a strip portion 31 that runs along the outside of the fluid pipe 6, and a sealing portion 32 provided on the strip portion 31 that repairs water leakage from the fluid leakage point X of the fluid pipe 6. In this embodiment, the segmented water-stopping strips 30 are in the shape of a four-part ring and are arranged at four locations along the outside of the fluid pipe 6.

[0035] The band portion 31 has a plurality of nut portions 33 located along the outside of the fluid pipe 6. In this embodiment, a pair of opposing band portions 31 assembled to the central position of the divided support 20 in the circumferential direction of the pipe have three nut portions 33 arranged at three positions in the circumferential direction of the pipe, along the pipe axis direction, and a pair of opposing band portions 31 assembled to both ends of the divided support 20 in the circumferential direction of the pipe have three nut portions 33 arranged at two positions in the circumferential direction of the pipe, along the pipe axis direction.

[0036] The sealing portion 32 includes a rubber seal 34, which is fixed to the strip portion 31 by adhesive 35. The rubber seal 34 is configured as shown in Figure 8. Figure 8(a) is a plan view, Figure 8(b) is a cross-sectional view along line bb in Figure 8(a), and Figure 8(c) is a perspective view. The rubber seal 34 has an uneven surface 34a on its entire surface that is pressed against the outer surface of the fluid pipe 2, and this uneven surface 34a is formed by a grid-like arrangement of bumps and dips. The sealing portion 32 is not limited to a rubber seal, but may be a resin seal or the like. Also, the uneven surface 34a has rectangular bumps and dips arranged in a grid pattern when viewed from above, but is not limited to this, and may have circular bumps and dips when viewed from above, or may be arranged in a staggered pattern or the like.

[0037] Other embodiments of the rubber seal 34 are shown in Figure 9. In the embodiment shown in Figure 9(a), the uneven surface 34a has rectangular indentations arranged in a grid pattern when viewed from a plane, but the indentations are larger than those in the embodiment shown in Figure 8. In the embodiment shown in Figure 9(b), the indentations are triangular in shape. In the embodiment shown in Figure 9(c), the indentations are hexagonal in shape. In the embodiment shown in Figure 9(c), the indentations are circular in shape.

[0038] The divided watertight zones 30 are positioned at four locations along the diameter of the fluid pipe on the outside of the fluid pipe 6. By pressing the uneven surface 34a of the rubber seals 34 against the outer surface of the fluid pipe 6, the uneven surface 34a of the rubber seals 34 deforms flexibly against the outer surface of the fluid pipe 6 and makes close contact, thereby reliably stopping water leakage from the fluid leakage point X due to corrosion of the fluid pipe 6.

[0039] (Pressing device) The multiple pressing bodies 40 in this embodiment are shown in Figure 10 and consist of multiple bolts 41 and nuts 42. These bolts 41 and nuts 42 are assembled to nuts 24 of the support portion 22, and the nuts 42 act as a retainer for the bolts 41. The tip of the bolt 41 is screwed into the nut portion 33 of the band portion 31, and the rotation of the bolt 41 presses the sealing portion 32 of the band portion 31 against the outer surface of the fluid pipe 6 via the nut portion 33, thereby reliably stopping water leakage from the fluid leakage point X due to corrosion of the fluid pipe 6.

[0040] Figure 11(a) shows the sealing portion 32 of the band portion 31 pressed against the outer surface of the fluid pipe 6, and Figure 11(b) shows the state in close contact with the surface of the fluid pipe 6. The uneven surface 34a ensures a more secure seal, stopping water leakage from the fluid leakage point X.

[0041] In this embodiment, four divided water-sealing strips 30 are arranged in the circumferential direction of the pipe on a pair of assembled divided support members 20. A divided water-sealing strip 30 with nut portions 33 positioned at three locations in the circumferential direction of the pipe is assembled to the central position of the pair of divided support members 20, and divided water-sealing strips 30 with nut portions 33 positioned at two locations in the circumferential direction of the pipe are assembled to both ends of the divided support members 20.

[0042] A divided watertight strip 30 with nut portions 33 positioned at three locations in the circumferential direction of the pipe faces a pair of divided support members 20 at their central positions in the circumferential direction of the pipe. A divided watertight strip 30 with nut portions 33 positioned at two locations in the circumferential direction of the pipe faces a pair of divided support members 20 at both ends in the circumferential direction of the pipe. The rotation of the bolts 41 of the multiple pressing bodies 40 presses the sealing portion 32 of the strip portion 31 against the outer surface of the fluid pipe 6 via the nut portions 33. The pressing force is met by a reaction force on the opposite side, which acts as a reaction force distribution mechanism, ensuring that the sealing portion 32 of the strip portion 31 is pressed evenly and reliably against the outer surface of the fluid pipe 2, thereby reliably stopping water leakage from the fluid leakage point X due to corrosion of the fluid pipe 6.

[0043] Furthermore, in this embodiment, the sealing portion 32 of the divided water-stopping band 30 is pressed evenly against the outer surface of the fluid pipe 6 so that the multiple pressing bodies 40 converge from the circumferential direction of the fluid pipe 2 toward the axial center of the fluid pipe 6. This ensures that water leakage from the fluid leakage point X due to corrosion of the fluid pipe 6 can be reliably stopped.

[0044] [First Leakage Repair Method] Next, a leak repair method for repairing fluid leaks in the fluid pipe 6 using the leak repair device 10 configured as described above will be explained. Figure 12 is a process diagram of the leak repair method.

[0045] The leak repair method of this embodiment includes assembly step A, installation step B, and leak repair step C, and has a simple structure that can reliably repair water leaks from the fluid leak point of the fluid pipe, and allows leak repair work to be carried out efficiently and at low cost.

[0046] (Assembly process) Assembly process A of this embodiment is a process of assembling a plurality of segmented water-stopping strips 30 that can be pressed against the fluid leakage area X of the fluid pipe 6 from the radially outward direction, and pressing bodies 40 that press the segmented water-stopping strips 30 against the outer surface of the fluid pipe 6, onto a plurality of segmented support bodies 20. First, a pair of segmented support bodies 20, four segmented water-stopping strips 30, and 30 pressing bodies 40 are prepared. The pair of segmented support bodies 20 are assembled, and four segmented water-stopping strips 30 and a number of pressing bodies 40 corresponding to the four segmented water-stopping strips 30 are attached to the support portion 22 of the assembled pair of segmented support bodies 20.

[0047] (Installation process) Installation step B of this embodiment is a step in which the multiple segmented support members 20 can be externally fixed to the fluid pipe 6 from the outside in the radial direction of the pipe, and the multiple segmented support members 20 are assembled and externally fixed to the fluid pipe 6. A pair of segmented support members 20 are placed on the outside of the fluid pipe 6, the support members 22 are aligned with the position of the fluid leakage area X of the fluid pipe 6, and the flanges 21a of the pair of pipe fixing members 21 and the flanges 22a of the pair of support members 22 are aligned and tightened with bolts and nuts 25 and 26 to fix them in place.

[0048] (Leak repair process) In this embodiment, the leak repair process C is a process of repairing water leakage from the fluid leakage point X by pressing a plurality of segmented water-stopping strips 30 against the outer surface of the fluid pipe 6 with a pressing body 40. The four segmented water-stopping strips 30 are evenly arranged on the outer surface of the fluid pipe 6, and are pressed against the fluid leakage point X from the radially outward direction of the fluid pipe by the operation of the pressing body 40. This simple structure makes it possible to reliably repair water leakage from the fluid leakage point of the fluid pipe, and allows leak repair work to be carried out efficiently and at low cost.

[0049] [Second Leak Repair Method] Next, a second leak repair method for repairing the fluid leak in the fluid pipe 6 will be described. Figure 13 shows the steps of the leak repair method.

[0050] The leak repair method of this embodiment is a method for repairing water leakage from a fluid leakage point X in a fluid pipe 6, and in Figure 13(a), a watertight strip 90 is used that can be pressed against the fluid leakage point X in the radial direction of the fluid pipe 6 from the outside.

[0051] In Figure 13(b), the water-stopping strip 90 is placed over the fluid leakage site X, and in Figure 13(c), the water-stopping strip 90 is pressed against the outer surface of the fluid pipe 6 using the pressing body 91 to repair the water leakage from the fluid leakage site X. The watertight strip 90 has a sealing portion 32. The sealing portion 32 includes a rubber seal 34 and is configured as shown in Figures 8 and 9.

[0052] (Examples) The water pipes experiencing leaks can be fitted with the seals without any particular restrictions on diameter. The water pressure range for the leaks is 0 to 1 MPa, and the cross-sectional area of ​​the leaking hole can be small enough to allow for installation within the area of ​​the rubber seal.

[0053] The rubber seal is not limited to any particular material, but NBR (acrylonitrile butadiene rubber) is preferred, and a hardness of 50° to 80° is achievable. Rubber seal thickness: 5 mm, recess depth: 2 mm, recess width: 5 mm, recess density: approximately 160 recesses per divided water-stopping strip (width 105 mm x height 90 mm), recess shape: recesses are arranged in a grid pattern of 5 mm squares.

[0054] Rubber seal pressure: The tightening bolts were tightened evenly and sequentially, increasing the torque until a maximum of 60 N·m (M16). The rubber seal was sufficiently compressed, and good watertightness was confirmed.

[0055] Because the rubber seal has an uneven surface, when pressed against the outer surface of the fluid pipe, it easily conforms to the unevenness of the fluid pipe's surface, making it possible to easily and reliably repair leaks from the fluid leak point in the fluid pipe, and enabling efficient and low-cost leak repair work. [Industrial applicability]

[0056] This invention is applied to a leak repair device and leak repair method for repairing water leakage from fluid leakage points in fluid pipes. It has a simple structure, can reliably repair water leakage from fluid leakage points in fluid pipes, and allows leak repair work to be carried out efficiently and at low cost. [Explanation of symbols]

[0057] 1 Fluid main 6 Fluid tube 3. Piping equipment 10 Leak repair device 20 split support 21 Pipe fixing part 22 Support part 23 Connecting part 24 nuts 30-section water barrier 31 Band 32 Seal part 33 Nut section 34 Rubber seal 34a Uneven surface 40 Pressing body 41 volts 42 nuts X Fluid leakage point A Assembly process B Installation process C Leak repair process

Claims

1. This is a leak repair device that repairs water leaks from fluid leak points in fluid pipes. A plurality of segmented support members that can be externally fixed to the fluid tube from the radially outward direction, A plurality of segmented watertight strips that can be pressed against the fluid leakage site on the fluid pipe from the radially outward direction, It includes a pressing body that is assembled to the plurality of divided support bodies and presses the plurality of divided water-stopping bands against the outer surface of the fluid pipe to repair water leakage from the fluid leakage site, The plurality of divided supports are, A pipe fixing portion is fixed to the fluid pipe from the radially outward direction, Located outside the fluid leakage area, a support portion to which the divided water-stopping band and the pressing body can be assembled, A connecting portion that connects the pipe fixing portion and the support portion at multiple positions, A leak repair device characterized by including [a certain element].

2. The plurality of divided water-stopping strips are A band along the outside of the fluid tube, The leak repair device according to claim 1, characterized in that it includes a sealing portion provided in the band portion for repairing water leakage from the fluid leakage portion of the fluid pipe.

3. The band portion is The fluid tube has multiple nut portions located along the outside of it, The pressing body includes a plurality of bolts, The leak repair device according to claim 2, characterized in that the rotation of the bolt presses the seal portion against the outer surface of the fluid pipe via the nut portion.

4. The sealing portion includes a rubber seal, The leak repair device according to claim 2, characterized in that the rubber seal has an uneven surface that is pressed against the outer surface of the fluid pipe.

5. This is a leak repair method for repairing water leaks from fluid leak points in fluid pipes. Using the leak repair device described in any one of claims 1 to 4, An assembly step of assembling a plurality of segmented water-stopping strips, which can be pressed against the fluid leakage site of the fluid pipe from the radially outward direction of the pipe, and a pressing body that presses these segmented water-stopping strips against the outer surface of the fluid pipe, onto a plurality of segmented support bodies, The plurality of segmented supports can be externally fixed to the fluid pipe from the outside in the radial direction, and the installation process involves assembling the plurality of segmented supports and externally fixing them to the fluid pipe. A leak repair step in which the plurality of segmented water-stopping bands are pressed against the outer surface of the fluid pipe by the pressing body to repair water leakage from the fluid leakage site, A leak repair method characterized by including [a certain element].

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