Leak repair tools

Abstract

To provide a leak repair tool for plugs that can be attached to pipeline components while ensuring high sealing performance, without being affected by fluid leaking from the plug. [Solution] The valve cover 144, which is part of the flow control device 1 as a pipeline component, has a main band 21 as a strip-shaped member that is wider than the seal seat portion 167 formed on the valve cover 144 so as to surround the plug 180 and the air vent hole 166, and has an opening 22 facing the plug 180 and the air vent hole 166, and comprises a sub-band 31 as a retaining member that fits the valve cover 144 together with the main band 21, and a cover 41 as a sealing member that has a rubber plate 45 as a sealing portion that contacts the seal seat portion 167 and can seal the plug 180.

Description

【Technical Field】 【0001】 The present invention relates to a leakage repair tool for repairing leakage from a hole formed in a pipeline component or an existing plug closing the hole in a non-stop flow state. 【Background Art】 【0002】 Conventionally, as a leakage repair tool for repairing leakage from an existing hole in a pipeline component or an existing plug closing the hole, a cylindrical body is externally fitted so as to cover the plug on the outer surface of the pipeline component, and both ends of this cylindrical body are sealed with an annular seal (see, for example, Patent Document 1). 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Utility Model Publication No. 49-36521 (page 2, FIG. 1) 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, in Patent Document 1, when such a leakage repair tool is attached to the outer surface of a pipeline component, there is a problem that the in-pipe fluid leaking from the plug affects it, and the cylindrical body cannot be externally fitted at a predetermined position, and the sealing performance by the annular seal cannot be ensured. 【0005】 The present invention has been made paying attention to such problems, and an object thereof is to provide a leakage repair tool that can be attached to a pipeline component while ensuring high sealing performance without being affected by the in-pipe fluid leaking from the plug. 【Means for Solving the Problems】 【0006】 In order to solve the above problems, the leakage repair tool of the present invention A leak repair tool for repairing leaks from existing plugs that seal holes formed in pipeline components while maintaining a continuous flow, The present invention is characterized by comprising: a strip-shaped member having an opening facing the plug and wider than the seal seat portion formed on the pipeline component so as to surround the plug; a holding member that fits the pipeline component onto the strip-shaped member together with the strip-shaped member; and a closing member having a sealing portion in contact with the seal seat portion and capable of sealing the plug. This feature allows the pipe fluid leaking from the plug or hole to be released through the opening of the strip-shaped member, enabling the strip-shaped member, which is wider than the seal seat, to be attached to the desired position on the pipeline component together with the retaining member without being affected by the leaked fluid. As a result, the sealing portion of the closure member attached to the opening of the strip-shaped member can be reliably brought into contact with the seal seat, thereby repairing the leak. 【0007】 The closing member is characterized by having a communication hole that communicates with the opening and a lid that can seal the communication hole. This feature allows for easy installation of the blocking member by opening the communication hole and releasing the fluid inside the pipe when installing the blocking member. 【0008】 The closing member is characterized by having a flat sealing seat portion around the communication hole. This feature allows for a tight seal with the lid by utilizing a flat sealing surface. 【0009】 The present invention is characterized by having a spacer interposed between the holding member and the pipeline component. This feature allows the retaining member to be stably fitted onto the pipeline component regardless of the shape of the outer surface of the pipeline component. 【0010】 A feature is that a gap is formed between the strip-shaped member and the pipeline component. This feature allows for securing mounting space for the closure member attached to the strip-shaped member. 【0011】 The seal seat portion is characterized by being a flat surface formed on the outer surface of the pipeline component. This feature allows for improved sealing performance by utilizing the flat surface formed on the outer surface of the pipeline component as a sealing seat. 【0012】 The retaining member is characterized by having approximately the same width as the strip-shaped member. This feature makes it easy to connect the retaining member to the strip-shaped member. [Brief explanation of the drawing] 【0013】 [Figure 1] This is a partially cutaway front view showing a flow control device, which serves as a pipeline component in an embodiment of the present invention, installed in an existing fluid pipe. [Figure 2] (a) is a left side view showing the valve cover, (b) is a partially broken section view, and (c) is a cross-sectional view AA of (b). [Figure 3] (a) is a left side view showing the main band, and (b) is a cross-sectional view of the band shown in (a). [Figure 4] (a) is a right side view showing the subband, and (b) is a cross-sectional view of the CC of (a). [Figure 5] (a) is a left side view showing the cover, and (b) is a DD cross-sectional view of (a). [Figure 6] (a) is a plan view showing the backing plate, and (b) is a right side view showing the backing plate. [Figure 7] (a) is a front view showing the valve cover with a backing plate in place, (b) is a right side view, and (c) is an EE cross-sectional view of (a). [Figure 8] (a) is a partially cutaway front view showing the main band and sub-band fitted onto the outer circumference of the valve cover, and (b) is an FF cross-sectional view of (a). [Figure 9] This is a cross-sectional view of GG in Figure 8(a). [Figure 10] (a) is an enlarged cross-sectional view of the main part of Figure 9, and (b) is an enlarged view showing the positional relationship between the opening of the main band and the sealing seat portion of the valve cover. [Figure 11](a) shows a partially cut-away front view of the state where a cover is attached to the main band, and (b) is a cross-sectional view taken along the line H-H of (a). [Figure 12] It is a cross-sectional view taken along the line I-I of FIG. 11(a). [Figure 13] (a) is an enlarged cross-sectional view of the main part of FIG. 12, and (b) is an enlarged cross-sectional view showing the state where the communication hole of the cover is plugged with an air vent bolt and the plug is sealed. [Figure 14] (a) is a front view showing the state where the main band and the sub-band are externally fitted to the outer periphery of the valve cover as a modified example, and (b) is a cross-sectional view taken along the line J-J of (a). [Figure 15] It is a cross-sectional view taken along the line K-K of FIG. 14. 【Embodiments for Carrying out the Invention】 【0014】 The embodiments for carrying out the leakage repair tool according to the present invention will be described below based on examples. 【Examples】 【0015】 The leakage repair tool according to the embodiment of the present invention will be described based on FIGS. 1 to 13. In the following description, the front side of FIG. 1 is defined as the front of the flow control device, the back side as the rear, the left side as the left, and the right side as the right for explanation. 【0016】 As shown in FIG. 1, at a predetermined location in the flow path composed of the existing fluid pipe 2, a flow control device 1 as an example of a pipeline component is installed, and the flow path can be opened and closed by opening and closing a partition valve 4 provided inside the flow control device 1. In this embodiment, for example, when leakage occurs due to corrosion, damage, etc. at the leakage location K in the upper part of the flow control device 1, it is possible to repair it in a non-stop flow state using the leakage repair tool 20 shown in FIGS. 3 to 5. The details of the leakage repair tool 20 will be described later. 【0017】 In this embodiment, the fluid in the fluid pipe 2 is tap water, but it may also be industrial water, agricultural water, sewage, or other liquids, or even gas or a gas-liquid mixture. The fluid pipe 2 is a ductile cast iron pipe and is formed as a straight pipe with a substantially circular cross-section. In this embodiment, the fluid pipe 2 is arranged in a substantially horizontal direction. The fluid pipe according to the present invention may also be made of other metals such as cast iron or steel, or concrete, polyvinyl chloride, polyethylene, or polyolefin. Furthermore, the inner circumferential surface of the fluid pipe may be covered with an epoxy resin layer, mortar, plating, or a suitable material may be applied to the inner circumferential surface of the fluid pipe by powder coating. 【0018】 [Flow control device (pipeline component)] As shown in Figure 1, the flow control device 1 mainly consists of a housing 3 that seals a predetermined portion of the fluid pipe 2 and a gate valve 4 inserted inside the housing 3, which acts as a fluid control device capable of opening and closing the flow path. 【0019】 The housing 3 is a split T-tube consisting of an upper housing 3a and a lower housing 3b, and has a divided structure consisting of multiple divided parts (two divided parts in this embodiment) divided along the central axis of the side body sections 6a and 6b. The lower housing 3b is composed of the main body section 5 and the lower half of the side body sections 6a and 6b, and can cover the lower part of the fluid pipe 2. The lower part of the main body section 5 is formed in a substantially cylindrical shape with an open top and a closed bottom 7, and the lower parts of the side body sections 6a and 6b are formed in a substantially semi-circular shape in side view with an open top. The upper housing 3a is composed of the upper half of the main body section 5 and the side body sections 6a and 6b, and can cover the upper part of the fluid pipe 2. The upper part of the main body section 5 is formed in a substantially cylindrical shape with open top and bottom surfaces, and the upper parts of the side body sections 6a and 6b are formed in a substantially semi-circular shape in side view with an open bottom. 【0020】 The lower housing 3b and the upper housing 3a are temporarily fastened together with a number of bolts and nuts N1, which are fastening members, and then their divided end faces are welded together to seal a predetermined portion of the fluid pipe 2 from above and below. In addition, the axial ends of the side body portions 6a and 6b are fitted onto the outside in a sealed manner, and the housing 3 is fixed to the fluid pipe 2 by the thrust rings 10, 10. 【0021】 The gate valve 4, which controls the fluid, mainly consists of an inner valve box 143 located inside the main body 5 of the housing 3, a valve cover 144 integrally connected to the upper part of the inner valve box 143, a valve body 145 provided inside the inner valve box 143 and the valve cover 144, a valve stem 146 for sliding the valve body 145 between the inner valve box 143 and the valve cover 144, and an operating part 147 connected to the valve stem 146 for opening and closing the valve body 145 from the outside. 【0022】 The inner valve body 143 has a plate-shaped partition wall portion 141 arranged to partition the flow path inside the main body portion 5, an opening 148 formed through the partition wall portion 141, and a disc-shaped inner cover portion 142 arranged substantially horizontally above the partition wall portion 141 and closing the upper opening of the main body portion 5. Furthermore, a packing 150 is provided in a recessed groove (not shown) extending across the lower end surface and side end surface of the partition wall portion 141, and a packing 151 is fitted into a recessed groove (not shown) extending circumferentially on the circumferential end surface of the inner cover portion 142. These packings 150 and 151 are integrated to be continuous and extend along the end surface of the gate valve 4. 【0023】 The valve stem 146 is pivotally supported at its upper end on the upper part of the valve cover 144 so as to be rotatable around its axis, and the female threaded portion 152 formed on the upper part of the valve body 145 is screwed into the male threaded portion formed on its outer circumference. Since the rotation of the valve body 145 around the valve stem 146 is restricted, the valve body 145 moves vertically between an open position (not shown) where it is housed inside the upper valve cover 144 and opens the opening 148, and a closed position (shown by the solid line in Figure 1(a)) where it is located inside the lower inner valve casing 143 and closes the opening 148, by rotating the valve stem 146 in forward and reverse directions via the operating part 147. 【0024】 As shown in Figures 2(a) to (c), the valve cover 144 consists of a short pipe formed in a substantially cylindrical shape, with valve cover flanges 144a and 144b projecting outward in the diametrical direction from the upper and lower ends, respectively. Multiple through holes 161 and 162 are formed in the circumferential direction in the valve cover flanges 144a and 144b, which penetrate vertically and through to which bolts can be inserted. 【0025】 As shown in Figure 1, bolts N2 inserted through each insertion hole 161 (see Figure 2) of the lower valve cover flange 144a are screwed into threaded holes (not shown) formed in the upper part of the inner valve box 143, thereby sealing the inner valve box 143 and the valve cover 144 together. Furthermore, a housing flange 143a protruding in the outward direction is formed on the upper part of the inner valve box 143, and a flange cover 155 fitted onto the upper part of the inner valve box 143 is sealed above the housing flange 143a by bolts and nuts N3, thereby fixing the inner valve box 143 inside the housing 3. 【0026】 As shown in Figures 2(a) to (c), the valve cover 144 has a valve body housing 165a capable of accommodating the upper part of the valve body 145, and a bearing housing 165b located above the valve body housing 165a and accommodating the bearing portion of the valve stem 146, arranged vertically. On the left side of the valve cover 144, at a position corresponding to the upper part of the valve body housing 165a, there is an air vent hole 166 that connects the internal valve body housing 165a to the outside and has a female threaded portion formed on its inner surface. As shown in Figure 9, the male threaded portion of an existing plug 180 is screwed into this air vent hole 166 in a sealed manner via a sealing tape or the like (not shown), so that, for example, when filling the valve body housing 165a with fluid, residual air inside the valve body housing 165a can be released to the outside by loosening or removing it. Furthermore, a seal seat portion 167, which is a flat surface forming a roughly annular shape when viewed from the left side, is formed around the air vent hole 166 on the outer surface 144f of the valve cover 144 so as to protrude outward. 【0027】 The upper part of the valve cover 144 has a concave constriction 168 that extends circumferentially, and at positions corresponding to the constriction 168, multiple rib portions 169 are formed at 90-degree intervals in the circumferential direction, with four ribs in this embodiment. The outer surface 144f of the valve cover 144, excluding the constriction 168 and the convex portion 170 (see the shaded area in Figures 2(a) and (b) described later), and the outer surface 169f of each rib portion 169 are substantially flush. 【0028】 On the outer surface 144f of the valve cover 144 below the constricted portion 168, a protrusion 170 is formed so as to protrude outward, for example, a cast lettering indicating the casting date and manufacturing lot for quality control and manufacturing responsibility indication of the valve cover 144 made of cast metal. However, the protrusion 170 is not limited to being composed of cast lettering or the like, but may be other display parts, etc. Also, the position of formation is not limited to the above position. 【0029】 [Leak repair tool] As an embodiment of the present invention, the leak repair tool 20 (see Figure 12) mainly comprises: a steel main band 21 as a strip-shaped member having an opening 22 facing the plug 180 and the air vent hole 166, and being wider than the seal seat portion 167 formed on the valve cover 144 so as to surround the plug 180 and the air vent hole 166, as shown in Figure 3; a steel sub-band 31 as a retaining member that fits the valve cover 144 together with the main band 21, as shown in Figure 4; a steel cover 41 as a sealing member that has a rubber plate 45 (see Figure 12) as a sealing portion that contacts the seal seat portion 167, as shown in Figure 5, and is capable of sealing the plug 180; a bolt and nut N5 (see Figure 8) for fastening the main band 21 and the sub-band 31; and a bolt N6 (see Figure 11) for attaching the cover 41 to the sub-band 31. Furthermore, as shown in Figure 6, a backing plate 51 may be provided between the sub-band 31 and the valve cover 144. 【0030】 As shown in Figures 3(a) and 3(b), the main band 21 consists of a plate-shaped main band body 21a that is approximately semi-circular in shape in plan view, and flanges 21b, 21b formed at both ends of the main band body 21a. A circular opening 22 is formed through the main band body 21a at approximately the center in the circumferential direction, and multiple (four in this embodiment) screw holes 23 are formed around the opening 22 into which bolts N6 (see Figure 11) for attaching the cover 41 are screwed. The flanges 21b, 21b each have bolt insertion holes 24, 24 for bolts and nuts N5 (see Figure 8) that fasten the main band 21 and the sub-band 31 together. 【0031】 Furthermore, the vertical dimension L2 of the main band 21 is larger than the diameter L1 of the seal seat portion 167 of the valve cover 144 (see Figure 2), while the diameter L3 of the opening 22 is smaller than the vertical dimension L2 of the main band 21 and larger than the diameter L1 of the seal seat portion 167 of the valve cover 144 (L2>L3>L1). 【0032】 As shown in Figures 4(a) and 4(b), the sub-band 31 consists of a plate-shaped sub-band body 31a that is approximately semi-circular in plan view, and flanges 31b, 31b formed at both ends of the sub-band body 31a. The flanges 31b, 31b each have bolt insertion holes 34, 34 for the bolts and nuts N5 (see Figure 8) that fasten the main band 21 and the sub-band 31. The vertical dimension L4 of the sub-band 31 is approximately the same as the vertical dimension L2 of the main band 21 (L4 = L2). 【0033】 As shown in Figures 5(a) and (b), the cover 41 mainly consists of a substantially cylindrical cover body 41a and a flange 41b formed to protrude outward from the cover body 41a. Inside the cover body 41a, a communication hole 42 is formed, consisting of a large-diameter hole 42a and a small-diameter hole 42b communicating with the large-diameter hole 42a. A female thread is formed on the inner circumferential surface of the small-diameter hole 42b, forming a screw hole into which an air vent bolt 80, described later, can be screwed. The cover body 41a also has a flat seat portion 46 around the small-diameter hole 42b. Furthermore, the diameter dimension L5 of the cover body 41a is larger than the diameter dimension L1 of the seal seat portion 167 of the valve cover 144 and smaller than the diameter dimension L3 of the opening 22 of the main band 21 (L1 <L5<L3)。 【0034】 Furthermore, as shown in Figure 5(b), a groove 43 capable of accommodating a rubber sheet 45 (see Figure 12) as a sealing portion is formed in an annular shape around the opening of the large-diameter hole 42a on the end face of the cover body 41a on the side of the large-diameter hole 42a. Since the inner diameter wall 41c of the groove 43 is recessed inward more than the outer diameter wall 41d, when the rubber sheet 45 housed in the groove 43 is pressed, it deforms to bulge inward. As shown in Figure 5(a), the flange 41b has multiple mounting holes 44 (four in this embodiment) for bolts N6 (see Figure 11) used to attach the cover 41 to the sub-band 31. 【0035】 As shown in Figures 6(a) and (b), the backing plate 51 has a roughly semi-circular shape in plan view and is composed of a horizontal plate portion 51a extending in the circumferential direction and a vertical plate portion 51b extending downward from the longitudinal center of the horizontal plate portion 51a. The vertical dimension L6 of the central part of the circumferential direction where the vertical plate portion 51b is located in the backing plate 51 is approximately the same as the vertical dimension L2 of the main band 21 and the vertical dimension L4 of the sub-band 31 (L6=L2, L6=L4), and the vertical dimension of the horizontal plate portion 51a alone is approximately half of the vertical dimension L6. 【0036】 [Leak repair tool] Next, as shown in Figure 1, a method for repairing fluid leakage occurring at the leakage point K on the left side of the valve cover 144 (for example, the screwed portion where the air vent hole 166 is plugged with the plug 180, or a damaged part of the air vent hole 166 or plug 180, etc.) using the leakage repair tool 20 will be explained based on Figures 7 to 13. 【0037】 First, as shown in Figures 7(a) to (c), the backing plate 51 is positioned along the outer surface of the valve cover 144, on the opposite side in the circumferential direction from the leakage point K on the outer surface of the valve cover 144, with the vertical plate portion 51b facing downwards, and both ends and the center of the horizontal plate portion 51a facing the front, rear, and right rib portions 169, 169, so as to avoid contact with the protrusions 170, 170. 【0038】 Furthermore, the backing plate 51 has a vertical dimension L6 in the circumferential direction that is approximately the same as the vertical dimension L2 of the main band 21 and the vertical dimension L4 of the sub-band 31. A portion of the vertical plate portion 51b abuts against the lower part of the rib portion 169 on the outer circumferential surface of the valve cover 144 to ensure stability, while the rest of the plate consists only of short horizontal plate portions 51a. Since it abuts against the rib portion 169 at only three points in the circumferential direction, it is less affected by protrusions such as dirt and rust adhering to the outer circumferential surface of the valve cover 144, and can be positioned in the correct orientation. The backing plate 51 can be held in place by hand or temporarily fixed with tape or the like. 【0039】 Next, as shown in Figures 8(a), (b) and 9, the main band 21 is positioned on the plug 180 side (left side), which is the leak point K of the valve cover 144, and the sub-band 31 is positioned on the backing plate 51 side (right side) of the valve cover 144. The flanges 21b and 31b are then fastened together with bolts and nuts N5, thereby fitting the main band 21 and sub-band 31 onto the outer circumference of the valve cover 144. 【0040】 More specifically, as shown in Figures 10(a) and (b), the main band 21 is positioned such that the plug 180 and seal seat portion 167 of the valve cover 144 face the opening 22. This allows the fluid leaking from the plug 180 to be released through the opening 22 of the main band 21, so that the main band 21 can be fitted onto the outer circumference of the valve cover 144 without being affected by the leaked fluid. 【0041】 In particular, as shown in Figure 10(b), the position of the opening 22 relative to the seal seat 167, that is, the circular seal seat 167 and the opening 22, can be visually confirmed and positioned so that they are approximately concentric, making it possible to place the cover 41, which will be described later, in the appropriate installation position. 【0042】 Furthermore, as shown in Figure 9, after fitting the main band 21 and the sub-band 31 onto the outer circumference of the valve cover 144, and before tightening the bolts and nuts N5, a gap S is provided between the main band 21 and the sub-band 31 and the outer surfaces 144f, 169f of the valve cover 144 (see Figure 7(a)) to serve as mounting space for the bands. Note that the distance between the main band 21 and the sub-band 31 and the outer surfaces 144f, 169f is slightly greater than the thickness of the backing plate 51. 【0043】 Next, as shown in Figures 11(a) and (b), bolts N6 are attached to the flange 41b of the cover 41, which has a rubber plate 45 attached to the groove 43, and bolts N6 are screwed into each screw hole 23 formed around the opening 22 of the main band 21, thereby attaching the cover 41 to the outside of the main band 21. 【0044】 More specifically, as shown in Figures 12 and 13(a), the plug 180 is housed in the large-diameter hole 42a within the cover body 41a by inserting a portion of the cover body 41a into the opening 22 of the main band 21. Then, by screwing in each bolt N6 while balancing them, the cover 41 is moved toward the valve cover 144 relative to the main band 21, so that the inner diameter side of the rubber plate 45 contacts the seal seat portion 167 of the valve cover 144 in the circumferential direction. When the cover 41 is moved toward the valve cover 144 relative to the main band 21 by screwing in each bolt N6 in this way, the main band 21 and the sub-band 31 are pulled toward the cover 41 side (left side) relative to the valve cover 144 by the reaction force, but the movement of the sub-band 31 toward the valve cover 144 is restricted by the interposition of the backing plate 51 between the valve cover 144 and the sub-band 31, and the gap S between the main band 21 and the valve cover 144 is maintained. At this time, by leaving the small-diameter hole 42b of the cover 41 open, the fluid leaking from the plug 180 can be released from the small-diameter hole 42b, so that the cover 41 can be attached to the opening 22 of the main band 21 without being affected by the leaked fluid. 【0045】 Once the rubber plate 45 of the cover 41 is pressed appropriately against the sealing seat portion 167 of the valve cover 144, the bolt and nut N5 are tightened. Since the movement of the sub-band 31 toward the valve cover 144 is restricted by the backing plate 51, when the bolt and nut N5 are tightened, the cover 41 moves toward the valve cover 144 along with the main band 21, the rubber plate 45 is strongly pressed against the sealing seat portion 167 of the valve cover 144, and the cover 41 comes into contact with the sealing seat portion 167 in a sealed state. 【0046】 Finally, as shown in Figure 13(b), with almost all of the air in the communication hole 42 of the cover 41 removed, an air venting bolt 80 having a seal ring 81 is screwed into the small-diameter hole 42b of the cover 41, and tightened while allowing the leaked fluid to escape through the hole 82 formed in the air venting bolt 80. This seals the large-diameter hole 42a surrounding the plug 180, which is the leak point K, with the cover body 41a, thereby repairing the leak from the plug 180. 【0047】 [Effects / Effects] As described above, the leak repair tool 20 as an embodiment of the present invention is capable of repairing leaks from an air vent hole 166, which is a hole formed in a valve cover 144, which is part of a flow control device 1 as a pipeline component, or from an existing plug 180 that closes the air vent hole 166, in a continuous flow state. It has an opening 22 facing the plug 180 and the air vent hole 166, and comprises a main band 21 as a band-shaped member that is wider than the seal seat portion 167 formed on the valve cover 144 so as to surround the plug 180 and the air vent hole 166, a sub-band 31 as a retaining member that fits the valve cover 144 together with the main band 21, and a cover 41 as a sealing member that has a rubber plate 45 as a sealing portion that contacts the seal seat portion 167 and can seal the plug 180. 【0048】 According to this, by releasing the pipe fluid leaking from the plug 180 through the opening 22 of the main band 21, the main band 21, which is wider than the seal seat portion 167, can be attached to the valve cover 144 in the desired position together with the sub-band 31 without being affected by the leaked fluid. As a result, the rubber plate 45 of the cover 41 attached to the opening 22 of the main band 21 can be reliably brought into contact with the seal seat portion 167, thereby repairing the leak. 【0049】 Furthermore, the cover 41 is constructed separately from the main band 21, and when the main band 21 with the cover 41 removed is fitted onto the valve cover 144, the seal seat portion 167 of the valve cover 144 can be visually inspected through the opening 22, allowing the valve cover 144's plug 180 and seal seat portion 167 to face the opening 22. In this way, the main band 21, which serves as the mounting base for attaching the cover 41 to the valve cover 144, can be fitted onto the valve cover 144 in the desired position together with the sub-band 31. Therefore, the rubber plate 45 attached to the cover body 41a can be easily pressed against the seal seat portion 167 without adjusting the position of the cover 41 relative to the main band 21. In addition, because the main band 21 is wider than the opening 22, the cover 41 can be stably fixed by multiple bolts N6 arranged around the opening 22. 【0050】 Furthermore, by attaching the cover 41, which has a rubber plate 45 as a sealing part, to the main band 21, which is stably fitted over the outer circumference of the valve cover 144 together with the sub-band 31, rather than directly to the valve cover 144, the force pressing the rubber plate 45 against the sealing seat portion 167 is distributed in the circumferential direction of the valve cover 144. This prevents a large load from concentrating at the leakage point K of the existing valve cover 144, which could cause damage or breakage to the valve cover 144, while improving the sealing performance of the plug 180. 【0051】 Furthermore, the cover 41 has a communication hole 42 that communicates with the opening 22, and an air vent bolt 80 that serves as a lid capable of sealing the communication hole 42. By opening the communication hole 42 and releasing the fluid inside the pipe when installing the cover 41, the cover 41 can be easily installed. 【0052】 Furthermore, the cover 41 has a flat sealing seat portion 46 around the small-diameter hole portion 42b side of the communication hole 42, allowing it to make close contact with the air vent bolt 80 by utilizing the flat seat portion 46. 【0053】 Furthermore, by interposing a spacer plate 51 between the sub-band 31 and the valve cover 144, the sub-band 31 can be stably fitted onto the valve cover 144 regardless of the shape of the outer surface of the valve cover 144. In addition, by forming an air gap S between the main band 21 and the valve cover 144, it is possible to secure mounting space for the cover 41 that is attached to the main band 21. 【0054】 Furthermore, by forming a gap S between the main band 21 and the valve cover 144, it is possible to secure mounting space for the cover 41 that is attached to the main band 21. 【0055】 Furthermore, since the seal seat portion 167 is a flat surface formed on the outer surface of the valve cover 144, the sealing performance can be improved by utilizing the flat surface formed on the outer surface of the valve cover 144 as the seal seat portion. 【0056】 Furthermore, since the vertical dimension L4 of the sub-band 31 is approximately the same as the vertical dimension L4 of the main band 21, it is easy to connect the sub-band 31 to the main band 21. 【0057】 Although embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any changes or additions that do not depart from the spirit of the present invention are also included. 【0058】 [Differentiation] Next, a modified example of the present invention, the leak repair tool 220, will be described based on Figures 14(a), (b) and 15. In the following modified examples, the main focus will be on describing configurations that differ from the above-described embodiment. For parts and configurations similar to those in the above-described embodiment, the same reference numerals will be used, or the reference numerals will be the same as those in the above-described embodiment plus "200", and detailed explanations may be omitted. 【0059】 In this modified example, as shown in Figure 15, leakage occurs from leakage points K, K consisting of air vents 366, 366 formed at two locations on the front and rear of the valve cover 344 and plugs 180, 180 that close the air vents 366, 366. The modified leakage repair tool 220, as shown in Figures 14(a), (b) and 15, has an opening 222 facing the plug 180 and a band-shaped opening wider than the seal seat portion 367 formed on the valve cover 344 surrounding the plug 180. The valve comprises a main band 221 as a component, a sub-band 231 as a retaining member that has an opening 222 facing the plug 180 and is wider than the seal seat portion 367 formed on the valve cover 344 so as to surround the plug 180 and fits the valve cover 344 together with the main band 221, and covers 241A, 241B as sealing members that have rubber plates 245, 245 as sealing portions that come into contact with the seal seat portions 367, 367 and can seally close the plugs 180, 180. 【0060】 Thus, if there are multiple leak points K, K in the valve cover 344, which is a component of the pipeline, an opening 222 may also be formed in the sub-band 231, which is a retaining member, and a cover 241B, which is a sealing member, may be attached to seal the plug 180. 【0061】 Furthermore, although the above embodiment illustrates a configuration in which the seal seat portion 167 is formed flat around the air vent hole 166, the present invention is not limited thereto, and may be formed in a curved shape around the air vent hole 166 on the outer surface 344f of the valve cover 344, as in the seal seat portion 367 of this modified example. 【0062】 Furthermore, in the above embodiment, a form was illustrated in which a backing plate 51 as a spacer is provided between the sub-band 31 and the valve cover 144 to provide a gap S between the main band 21 and the sub-band 31 and the valve cover 144. However, the present invention is not limited thereto, and as in this modified example, a gap S may be provided between the main band 221 and the sub-band 231 and the valve cover 344 by providing a plurality of spacer ribs 250 that extend vertically in the circumferential direction on the inner surfaces of the main band 221 and the sub-band 231. 【0063】 [Other variations] Furthermore, in the above embodiment, a valve cover 144 provided on the upper part of the flow control device 1 was shown as an example of a pipeline component, but the present invention is not limited thereto. If a leak occurs in the housing 3 of the flow control device 1, consisting of an artificially formed hole or a plug that closes the hole, the leak repair tool may be fitted onto the housing 3, or onto other components. Moreover, the leak repair tool of the present invention may be applied to components other than the flow control device 1 (for example, components that make up repair valves or air valves, or pipes that make up flow paths). 【0064】 Furthermore, in the above embodiment, an example was given in which an air vent hole 166 formed as a hole in the valve cover 144 as a pipeline component is closed with a plug 180. However, the present invention is not limited to this, and the hole may be formed for purposes other than an air vent hole. For example, it may be a bolt hole into which a bolt that holds down the valve body 145 or valve cover 144 can be screwed in. In this case, the bolt hole as a hole may be closed with a bolt as a plug. 【0065】 Furthermore, in the above embodiment, the main band 21 as a strip-shaped member was exemplified as having a vertical dimension L2 wider than the seal seat portion 167 in the circumferential direction. However, the present invention is not limited to this, and as long as at least the area around the opening 22 has a vertical dimension L2 wider than the seal seat portion 167, the vertical dimension of the other parts may be shorter. 【0066】 Furthermore, in the above embodiment, the sub-band 31 as a retaining member was exemplified as being composed of a strip-shaped member, similar to the main band 21. However, the present invention is not limited to this, and the vertical dimension L4 of the sub-band 31 does not necessarily have to be the same as the vertical dimension L2 of the main band 21. Also, as long as it is used to fit the conduit components together with the strip-shaped member, it may be composed of, for example, a wire rope. 【0067】 Furthermore, in the above embodiment, the cover 41 as a closing member is configured separately from the main band 21, and the main band 21 is fitted onto the valve cover 144, the opening 22 is positioned relative to the seal seat portion 167, and then attached to the main band 21. However, the present invention is not limited thereto, and the closing member may be attached to the strip-shaped member so as to be pivotally supported or slidably movable so as to be able to open and close the opening. 【0068】 Furthermore, in the above embodiment, the cover 41 as a sealing member is exemplified as having a cover body 41a having a communication hole 42 that communicates with the opening 22 and an air vent bolt 80 as a lid that can seal the communication hole 42, but the present invention is not limited to this, and it is not necessary to have these communication hole and lid, and the plug 180 may be sealed as is. 【0069】 Furthermore, in the above embodiment, a configuration was illustrated in which a backing plate 51 is placed to create an air gap S between the sub-band 31 and the valve cover 144 before the main band 21 and the sub-band 31 are fitted onto the valve cover 144. However, the present invention is not limited to this, and it is not necessarily required to provide a backing plate 51 as a spacer. [Explanation of Symbols] 【0070】 1. Flow control device (pipeline component) 2 Fluid tube 3. Housing (pipeline component) 20,220 Leak repair tools 21,221 Main band (strip-shaped member) 21a Main band body 21b Flange 22,222 openings 23 screw holes 31,231 Sub-band (retaining member) 31a Sub-band body 41,241A,241B Cover (Closure Member) 41a Cover body 41b Flange 42 Communication hole 43 Concave groove part 45,245 Sheet rubber (sealing part) 46 Seat (sealed seat) 51. Backing plate (spacer) 51a Horizontal plate part 51b Vertical plate part 80. Air vent bolt (cover) 81 Seal ring 143a Housing flange 144,344 Valve cover (pipeline component) 144a Valve cover flange 144f,344f External surface 145 Valve body 155 Flange cover 165a Valve body housing 165b Bearing housing 166,366 air vents (holes) 167,367 Seal seat portion 168 Waist area 169 Rib section 169f (outer surface of the rib section) 180 plug K Leak location S void

Claims

[Claim 1] A leak repair tool for repairing leaks from holes formed in pipeline components or existing plugs that close said holes in a continuous flow state, A leak repair tool comprising: a strip-shaped member having an opening facing the plug and wider than the seal seat portion formed on the pipeline component so as to surround the plug; a holding member that fits the pipeline component onto the strip-shaped member together with the strip-shaped member; and a sealing member having a sealing portion in contact with the seal seat portion and capable of sealing the plug. [Claim 2] The leak repair tool according to claim 1, characterized in that the sealing member has a communication hole communicating with the opening and a lid capable of sealing the communication hole. [Claim 3] The leak repair device according to claim 2, characterized in that the sealing member has a flat sealing seat portion around the communication hole. [Claim 4] The leak repair tool according to any one of claims 1 to 3, characterized in that a spacer is interposed between the holding member and the pipeline component. [Claim 5] The leak repair device according to claim 4, characterized in that a gap is formed between the strip-shaped member and the pipeline component. [Claim 6] The leak repair tool according to claim 1, characterized in that the seal seat portion is a flat surface formed on the outer surface of the pipeline component. [Claim 7] The leak repair tool according to claim 1, characterized in that the retaining member has substantially the same width as the strip-shaped member.

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