Installation method for repair devices

Abstract

To provide a method of attaching a repair device that can be installed on a fluid pipe without imposing burden on the vicinity of a damaged region of the fluid pipe.SOLUTION: A method of attaching a repair device 2 for a fluid pipe 1 that has at least a housing 5 which is formed of an annular cylindrical body 7 composed of multiple split members 71 split in a circumferential direction, and that has an open region T which is open sideway and a blocked region S which is blocked. The repair device 2 is externally fit to the fluid pipe 1 in a sealing manner. In a circumferential movement and connection process, split members 71 present in the open region T are turned along an external peripheral surface of the fluid pipe 1 to be moved to the blocked region S, then further split members 71 are externally fit to the fluid pipe 1 from the open region T, and the split members 71 which have been moved to the blocked region S and the further split members 71 in are connected in the circumferential direction to form the connected split members 71, 71. This process is repeated until the connected split members 71, 71 become annular to form the annular cylindrical body 7, thus constructing the housing 5.SELECTED DRAWING: Figure 15

Description

Technical Field

[0001] The present invention relates to a repair device for externally fitting and repairing a damaged portion of a fluid pipe in a sealed manner.

Background Art

[0002] Conventionally, fluid pipes that make up a water pipe bridge or fluid pipes buried underground may crack due to earthquakes, ground vibrations, soil pressure, or aging deterioration, etc., which may cause unexpected leakage accidents. As a repair work for this type of leakage location, usually, a repair device composed of a housing divided into a plurality of parts in the circumferential direction is used. The repair device is externally fitted in a sealed manner via a packing to a damaged portion of the fluid pipe, such as a cracked portion of the fluid pipe, or for example, a macrocell corrosion caused by soil quality, reinforcing bars in concrete, etc., or a damaged portion such as an aged portion generated by dew or salt in an exposed pipe such as a water pipe bridge, or a portion that may be damaged, thereby sealing fluid leakage.

[0003] For example, the repair device shown in Patent Document 1 forms a housing by connecting two cylindrical bodies constituted by divided members divided in the circumferential direction in series in the axial direction, and is configured to externally fit the damaged portion of the fluid pipe in a sealed manner, so that even when the damaged portion of the fluid pipe is formed over a wide range in the axial direction, fluid leakage of the fluid pipe can be sealed.

[0004] Specifically, tapered surfaces that expand in diameter toward the end surfaces of the cylindrical bodies are formed on the inner peripheral surfaces at both ends of each cylindrical body. An annular elastic member is disposed between the tapered surfaces provided at the connecting ends of the cylindrical bodies. Due to the fastening force when fastening the connecting ends of the cylindrical bodies in the axial direction, the elastic member is pinched between the tapered surfaces, and the elastic member is brought into pressure contact with the outer peripheral surface of the fluid pipe. Also, an elastic member is disposed on the tapered surface at the end opposite to the connecting end of the cylindrical body, and a pressing ring (supporting means) is disposed on the outer side in the axial direction thereof. The pressing ring is fixed to the outer peripheral surface of the fluid pipe in a state of being connected to the cylindrical body, and the elastic member seals between the tapered surface and the fluid pipe.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Utility Model Publication No. 46-27163 (page 1, figure 1) [Overview of the project] [Problems that the invention aims to solve]

[0006] However, in the repair device described in Patent Document 1, the connection between the cylindrical ends is sealed by pressing an elastic member, which is positioned between tapered surfaces provided at the connecting ends of the cylindrical bodies, against the outer surface of the fluid pipe. Therefore, when the repair device is installed on the fluid pipe, the elastic member positioned across the connection between the cylindrical bodies presses the fluid pipe inward, which can cause a load to be placed near the damaged area of ​​the fluid pipe, potentially leading to further damage to the fluid pipe.

[0007] This invention addresses these problems and aims to provide a repair device that can be installed on a fluid pipe without applying load to the area near the damaged part of the fluid pipe. [Means for solving the problem]

[0008] To solve the above problems, the repair device of the present invention is: A fluid pipe repair device comprising a housing constructed by connecting multiple cylindrical bodies, each consisting of a divided member divided in the circumferential direction, in the axial direction, and support means arranged at both axial ends of the housing, wherein the fluid pipe is fitted onto the housing in a sealed manner, The cylindrical body has an inner diameter that allows the fluid tube to be loosely fitted into it, and is sealed by a sealing member positioned between the end faces of the connecting ends to which the cylindrical bodies are connected or on the outer diameter side of the connecting ends, and the support means supports the housing on the fluid tube with a distance between the inner circumferential surface of the housing and the outer circumferential surface of the fluid tube. This feature means that the sealing members that seal the gaps between the inner circumferential surface of the housing and the connecting ends of the cylindrical bodies do not come into contact with the outer circumferential surface of the fluid pipe. Therefore, the repair device can be installed on the fluid pipe without applying load to the vicinity of the damaged area of ​​the fluid pipe.

[0009] A flange is provided at the connecting end of the cylindrical body. The adjacent cylindrical bodies are connected by a connecting ring having a recess that can be fitted onto the opposing flange portion. This feature allows the recesses of the connecting ring to be fitted circumferentially onto the opposing flanges of adjacent cylindrical bodies, enabling precise connection while aligning the axes of the adjacent cylindrical bodies.

[0010] The connecting ring comprises a plurality of divided sections in the circumferential direction and fastening members that connect the divided sections in the circumferential direction, and is characterized in that the sealing member is disposed between the recess and the flange. This feature allows the sealing member to be held between the recess and the flange by the fastening force of the fastening member, enabling the connection of adjacent cylindrical bodies and the sealing of the connection ends of the cylindrical bodies to be performed in a single process.

[0011] The cylindrical body is characterized in that a sealing member extending in the axial direction is arranged at the circumferential end of the divided member, and the sealing member is in contact with the inner circumferential surface of the sealing member. According to this feature, the sealing member comes into contact with the inner circumferential surface of the sealing member, which is pressed in the radial direction by the fastening force of the fastening member, resulting in a high level of airtightness between the sealing member and the sealing member.

[0012] The sealing member is characterized in that it is divided from the sealing member at different positions in the circumferential direction. This feature ensures that the ends of the divided sealing members do not overlap with the sealing member in the circumferential direction, resulting in a high level of airtightness between the sealing members. [Brief explanation of the drawing]

[0013] [Figure 1] This is an explanatory diagram showing a repair device attached to a fluid pipe in an embodiment of the present invention. [Figure 2] This is a partial cross-sectional view showing a repair device attached to a fluid pipe. [Figure 3] It is a sectional view taken along the line A-A of FIG. 2. [Figure 4] (a) is an enlarged sectional view of the main part showing the structure near the connecting means, and (b) is an enlarged sectional view of the main part at a different position in the circumferential direction of (a). [Figure 5] (a) is an enlarged sectional view of the main part showing the structure near the supporting means, and (b) is an enlarged sectional view of the main part at a different position in the circumferential direction of (a). [Figure 6] (a) is an explanatory view showing the structure of the connecting housing in the connecting means, and (b) is an explanatory view showing the structure of the end housing in the supporting means. [Figure 7] (a) to (e) are views showing the structure of the seal member. [Figure 8] (a) to (e) are views showing the structure of the elastic member. [Figure 9] (a) and (b) are views showing the structure of the packing. [Figure 10] It is an explanatory view showing a state where a cylindrical body is externally fitted to a fluid pipe. [Figure 11] It is an explanatory view showing a state where the cylindrical bodies are aligned. [Figure 12] It is an explanatory view showing a state where the cylindrical bodies are connected by the connecting means to form a housing. [Figure 13] It is an explanatory view showing a state where the housing is supported by the supporting means on the fluid pipe. [Figure 14] It is an explanatory view showing a case where there are obstacles around the fluid pipe. [Figure 15] (a) to (d) are explanatory views showing the procedure for installing the cylindrical body while avoiding obstacles. [Figure 16] (a) to (d) are explanatory views showing the procedure for constructing the housing while avoiding obstacles. [Figure 17] (a) to (c) are explanatory views showing the procedure for supporting the housing on the fluid pipe while avoiding obstacles. [Figure 18] It is a sectional view showing Modification 1 of the present invention. [Figure 19] It is an explanatory view showing Modification 2 of the present invention. [Figure 20]This is an explanatory diagram showing a modified example 3 of the present invention. [Figure 21] This is an explanatory diagram showing a modified example 4 of the present invention. [Figure 22] This is an explanatory diagram showing a modified example 5 of the present invention. [Figure 23] This is an explanatory diagram showing a modified example 6 of the present invention. [Modes for carrying out the invention]

[0014] Embodiments for implementing the repair device according to the present invention will be described below based on examples. [Examples]

[0015] The repair device according to the embodiment will be described with reference to Figures 1 to 17. In the following description, the right side of Figure 1 will be referred to as one axial side, and the left side as the other axial side.

[0016] As shown in Figure 1, the repair device 2 is designed to seal the damaged portion of the fluid pipe 1, preventing fluid leakage from the fluid pipe 1, and to repair and reinforce the damaged portion of the fluid pipe 1. The damaged portion of the fluid pipe 1 includes, for example, cracks 1a that are formed continuously or intermittently in the axial or circumferential direction of the fluid pipe 1, and deteriorated portions 1b that have corroded due to aging, dew, salt, etc., and also includes portions where fluid is already leaking or where there is a risk of leakage. Here, the cracks 1a and deteriorated portions 1b may exist individually, or there may be multiple or mixed portions.

[0017] In this embodiment, the fluid pipe 1 is made of steel for water supply and constitutes a water pipe bridge 1A (not shown) that is constructed over a river or estuary between spaced-apart abutments 3 and 4, and is formed in a substantially circular shape in cross-section. The fluid pipe according to the present invention may be made of metal such as ductile cast iron or other cast iron, or of concrete, polyvinyl chloride, polyethylene, or polyolefin. Furthermore, the inner circumferential surface of the fluid pipe may be covered with a mortar layer or, for example, epoxy resin, or the inner circumferential surface of the fluid pipe may be covered with an appropriate material by powder coating. In addition, although the fluid in the fluid pipe in this embodiment is tap water, it is not limited to tap water in this embodiment, and may be industrial water, agricultural water, sewage, gas, or a gas-liquid mixture of gas and liquid. Furthermore, the fluid pipe 1 may be buried in the ground in a substantially horizontal direction.

[0018] As shown in Figures 1 and 2, the repair device 2 comprises a housing 5 and support means 6, 6 positioned at both axial ends of the housing 5 for fixing to the fluid pipe 1. In this embodiment, the housing 5 is constructed by connecting two cylindrical bodies 7, 7 in the direction of extension (axial direction) of the fluid pipe 1 using connecting means 8. The housing 5 may also be constructed by connecting three or more cylindrical bodies 7 in the axial direction.

[0019] As shown in Figures 1 to 3, the cylindrical body 7 is constructed by connecting two segmented members 71, 71 that form an arc shape and curve along the outer surface of the fluid pipe 1 in the circumferential direction. Specifically, the segmented members 71 are made of metal, resin, etc., and flange portions 71a, 71a are formed at both ends of the segmented members 71 in the circumferential direction. The cylindrical body 7 is constructed by tightening the flange portions 71a, 71a of the circumferentially opposing segmented members 71, 71 with T-head bolts and nuts 9 as fastening members. Packing 10 (sealing member) extending in the axial direction is placed in recesses formed on the opposing surfaces of these flange portions 71a, 71a, sealing the space between the flange portions 71a, 71a. The cylindrical body 7 may be composed of three or more segmented members 71.

[0020] The cylindrical body 7 has a substantially symmetrical shape with respect to an imaginary line perpendicular to its axial direction, and substantially identical flange portions 72 and 73 are formed at both ends of the cylindrical body 7 in the axial direction, projecting in annularly toward the outer diameter. As shown in Figure 4, inclined surfaces 72a and 73a are formed on the outer circumferential surfaces of the flange portions 72 and 73, extending so as to gradually decrease in diameter toward the outer circumferential surface of the main body portion of the cylindrical body 7. In this embodiment, the flange portion on one axial side of each cylindrical body 7 will be referred to as flange portion 72, and the flange portion on the other axial side will be referred to as flange portion 73.

[0021] Returning to Figures 1 to 3, the cylindrical body 7 has a through hole 74 formed approximately in the axial center of the cylindrical body 7, connecting the outer diameter side and the inner diameter side of the cylindrical body 7. This through hole 74 is closed by screwing a cap 75 (lid member) onto a female thread formed on the inner surface of the through hole 74. In this embodiment, the fluid pipe 1 is fitted onto the cylindrical body 7 such that these through holes 74 and the cap 75 screwed onto them are located at the top of the pipe.

[0022] The connecting means 8 includes a connecting housing 81 (connecting ring) which has a concave cross-sectional shape with a recess 82 opening on the inner diameter side and a circumferentially divided structure, and a sealing member 83 which is housed in the recess 82 of the connecting housing 81 and has a circumferentially divided structure. The connecting means 8 connects the cylindrical bodies 7, 7 by fitting its recess 82 onto the flange portions 72, 73 and pressing the inner diameter side edge of the recess 82 against the inclined surfaces 72a, 73a, thereby applying a biasing force in the direction that brings the cylindrical bodies 7, 7 closer together. The sealing member 83 is made of an elastic material such as resin or rubber, and is compressed between the inner bottom surface of the recess 82 and the outer circumferential surface of the flange portions 72, 73 by the connecting force between the arc-shaped members 84 that constitute the connecting housing 81, thereby sealing the space between the flange portions 72, 73.

[0023] Specifically, as shown in Figures 4 and 6(a), the connecting housing 81 is composed of three arc-shaped members 84 (divided bodies) that are evenly divided in the circumferential direction. Connecting flanges 84a are formed at both circumferential ends of the arc-shaped members 84, and on the surfaces of the connecting flanges 84a opposite to the surface facing the other connecting flanges 84a, a pair of projections 84b are formed, spaced apart in the axial direction and projecting in the circumferential direction (see the view from arrow B in Figure 6(a)). The heads of the T-head bolts 15 (fastening means) that are inserted through the insertion holes 84c of the connecting flanges 84a and connect the arc-shaped members 84 are in contact with these projections 84b, preventing rotation, thereby facilitating the fastening of the T-head bolts 15 and preventing them from loosening (see Figure 2). In addition, fitting portions 86 are recessed in the circumferential direction at both ends of the arc-shaped members 84, into which the fitting portions 85a and 85b of the seal divided body 85, which will be described later, are fitted. Furthermore, the connecting housing 81 may be composed of two or four or more divided parts.

[0024] Figure 7 shows a seal segment 85 obtained by dividing the seal member 83 into three parts in the circumferential direction with a length approximately equal to that of the arc-shaped member 84. As shown in Figures 7(a) and 7(b), a fitting portion 85a is formed on one end of the seal segment 85, protruding on both the outer diameter side and the axial side. This fitting portion 85a is formed at a position on the other end side of the one end face of the seal segment 85, that is, the one end of the seal segment 85 constitutes a convex portion 87 that protrudes circumferentially from the fitting portion 85a.

[0025] Furthermore, as shown in Figures 7(a) and 7(c), a fitting portion 85b is formed on the other side of the seal segment 85, protruding on both the outer diameter side and the axial side. This fitting portion 85b is formed at a position closer to one end than the other end face of the seal segment 85, meaning that the other end of the seal segment 85 is a recessed portion 88 that is recessed in the circumferential direction compared to the fitting portion 85a.

[0026] Furthermore, as shown in Figure 7(d), the inner circumferential surface of the seal segment 85 has multiple bulging portions 85c that protrude inward in the axial direction, and thin-walled portions 85d that are recessed in the axial direction are formed on both axial sides of the seal segment 85. The formation of the thin-walled portions 85d provides a margin for elastic deformation when the bulging portions 85c are pressed against the flange portions 72 and 73, allowing the seal segment 85 to undergo suitable elastic deformation.

[0027] Furthermore, as shown in Figure 7(e), a protrusion 87 provided on one end of the seal segment 85 can be fitted into a recess 88 provided on the other end of the seal segment 85, thereby improving the sealing performance of the seal segments 85 connected in the circumferential direction. In addition, the seal segment 85 is equipped with fitting portions 85a and 85b, and these fitting portions 85a and 85b are fitted into the fitted portion 86 of the arc-shaped member 84 (see Figure 6(a)), thus preventing the seal segment 85 from moving in the circumferential direction relative to the arc-shaped member 84.

[0028] Returning to Figures 1 to 3, the inner diameter of the housing 5, which is constructed by connecting two cylindrical bodies 7, 7 with a connecting means 8, specifically the inner diameter of the flange portions 72, 73, which are the smallest diameters of the housing 5, is formed to be larger than the outer diameter of the fluid pipe 1, so that the housing 5 can loosely fit the fluid pipe 1. This housing 5 is fixed to the fluid pipe 1 by support means 6, 6 located at both ends of the housing 5.

[0029] The support means 6 includes an end housing 61 with a circumferentially divided structure having recesses 62a and 62b that open to the inner diameter side, and an elastic member 63 which is housed in the recess 62a of the end housing 61 and also has a circumferentially divided structure. The support means 6 is configured such that the recess 62b is fitted onto the flange portion 72 or flange portion 73, and the inner diameter side edge of the recess 62b is pressed against the inclined surface 72a or inclined surface 73a (see Figure 4), thereby applying a biasing force in a direction that separates the cylindrical bodies 7, 7 from each other.

[0030] Furthermore, the elastic member 63 is made of an elastic material such as resin or rubber, and is pressed against the outer surface of the fluid pipe 1 by the connecting force between the arc-shaped members 64 that constitute the end housing 61, sealing the space between the flange portion 72 or flange portion 73 and the fluid pipe 1, and the cylindrical bodies 7, 7 are supported by the fluid pipe 1 by the pressing force of the elastic member 63 against the outer surface of the fluid pipe 1. Specifically, the elastic member 63 is pressed against the outer surface of the fluid pipe 1 at a position that is axially outward from the cylindrical body 7 and on the inner diameter side of the cylindrical body 7, so that the inner surface of the cylindrical body 7 is spaced outward from the outer surface of the fluid pipe 1 along its entire circumference. Note that the support means 6, 6 arranged on both sides in the axial direction have the same configuration, so only the support means 6 arranged on one side in the axial direction will be described, and the description of the support means 6 arranged on the other side in the axial direction will be omitted.

[0031] Specifically, as shown in Figures 5 and 6(b), the end housing 61 is composed of three arc-shaped members 64 (divided bodies) that are evenly divided in the circumferential direction. Connecting flanges 64a are formed at both circumferential ends of the arc-shaped members 64, and on the surfaces of the connecting flanges 64a opposite to the surface facing the other connecting flanges 64a, a pair of projections 64b are formed, spaced apart in the axial direction and projecting in the circumferential direction (see view of arrow C in Figure 6(b)). The heads of T-head bolts 16, which are inserted through the insertion holes 64c of the connecting flanges 64a and connect the arc-shaped members 64 to each other, come into contact with these projections 64b, preventing rotation, thereby facilitating the fastening of the T-head bolts 16 and preventing them from loosening (see Figure 2). In addition, fitting portions 66 are recessed in the circumferential direction at both ends of the arc-shaped members 64, into which the fitting portions 65a and 65b of the elastic divided body 65, which will be described later, are fitted. Furthermore, the aforementioned recess 62a is formed on one axial side of the end housing 61, and the recess 62b is formed on the other axial side. The end housing 61 may be composed of two or four or more divided parts.

[0032] Figure 8 shows an elastic segmented body 65 obtained by dividing the elastic member 63 into three parts in the circumferential direction with a length approximately equal to that of the arc-shaped member 64. As shown in Figures 8(a) and 8(b), a fitting portion 65a is formed on one end of the elastic segmented body 65, protruding on the outer diameter side and one side in the axial direction. This fitting portion 65a is formed at a position on the other end side of the end face of the elastic segmented body 65, that is, the end of the elastic segmented body 65 on one end side constitutes a convex portion 67 that protrudes circumferentially from the fitting portion 65a.

[0033] Furthermore, as shown in Figures 8(a) and 8(c), a fitting portion 65b is formed on the other side of the elastic segment 65, protruding on the outer diameter side and one side in the axial direction. This fitting portion 65b is formed at a position closer to one end than the other end face of the elastic segment 65, meaning that the other end of the elastic segment 65 is a recessed portion 68 that is recessed in the circumferential direction compared to the fitting portion 65a.

[0034] Furthermore, as shown in Figure 8(d), the elastic segment 65 has bifurcated bulging portions 65c and 65d that bulge in the inner diameter direction and axial direction on its inner and side surfaces, and protruding portions 65e and 65f are formed parallel to the bulging portions 65c and 65d, respectively. When the support means 6 is assembled, the bulging portions 65c and 65e are pressed against the outer surface of the fluid pipe 1, the bulging portions 65d and 65f are pressed against the axial end surface of the flange portion 72, and the bulging portions 65c and 65d are pressed against each other (see Figure 5). In addition, the elastic segment 65 has a fitting portion 65g formed on its outer diameter side that can be fitted into the recess 62a of the end housing 61.

[0035] Furthermore, as shown in Figure 8(e), a protrusion 67 provided on one end of the elastic segment 65 can be fitted into a recess 68 provided on the other end of the elastic segment 65, thereby improving the sealing performance between the elastic segments 65 connected in the circumferential direction. In addition, the elastic segment 65 is equipped with fitting portions 65a and 65b, and since these fitting portions 65a and 65b are fitted into the fitted portion 66 of the arc-shaped member 64 (see Figure 6(a)), it is possible to prevent the elastic segment 65 from moving in the circumferential direction relative to the arc-shaped member 64.

[0036] Next, the shape of the packing 10 will be described. As shown in Figure 9, the packing 10 is made of an elastic material such as rubber and comprises a straight section 11 that extends in the axial direction and has a substantially circular cross-section, a first piece 12 that extends in the inward direction from both ends of the straight section 11, a second piece 13 that extends away from the straight section 11 from the inner diameter side end of the first piece 12, and a third piece 14 that extends outward from the end of the second piece 13 (only the other axial side is shown here).

[0037] As shown in Figure 4(a), on the connecting means 8 side, the packing 10 has a third piece 14 that protrudes axially outward from the flanges 72 and 73 and also protrudes in the outer diameter direction. The third pieces 14, 14 of the packings 10, 10, which are connected axially to the cylindrical bodies 7, 7, are in close contact with each other in the axial direction, and the outer diameter ends of these third pieces 14, 14 are in close contact with the inner diameter side of the sealing member 83. Also, as shown in Figure 5(a), on the support means 6 side, the packing 10 has a third piece 14 that protrudes axially outward from the flanges 72 and also protrudes in the outer diameter direction, and its axial end is in close contact with the elastic member 63. Therefore, the space between the packing 10 and the sealing member 83, and the space between the packing 10 and the elastic member 63 are sealed. However, the third pieces 14, 14 of the packings 10, 10 do not necessarily have to be in close contact with each other in the axial direction; the side ends of the third pieces 14 may be in close contact with the side surface of the flange 72 or flange 73 to create a seal.

[0038] Next, the assembly procedure for the repair device 2 will be explained based on Figures 10 to 13. As shown in Figure 10, first, the divided members 71, 71 are connected circumferentially at a position that is spaced apart from the damaged part (cracked part 1a and deteriorated part 1b) of the fluid pipe and sandwiched in the axial direction of the pipe, and the cylindrical bodies 7, 7 are attached to the fluid pipe 1. As mentioned above, the cylindrical bodies 7, 7 are formed with a larger diameter than the outer diameter of the fluid pipe 1, so they are loosely fitted into the fluid pipe 1. At this time, the divided members 71, 71 can be connected circumferentially at a position spaced apart from the damaged part of the fluid pipe, so the complexity of the work can be avoided even if there is fluid leakage. In particular, if there is fluid leakage, it is best to use a cap 75 that has a hole that allows fluid to be discharged while it is screwed into the through hole 74, and discharge the fluid while performing the work.

[0039] Next, as shown in Figure 11, the cylindrical bodies 7, 7 are moved axially to cover the damaged portion (cracked portion 1a and deteriorated portion 1b) of the fluid pipe and are positioned accordingly. Since the cylindrical bodies 7, 7 are loosely fitted onto the fluid pipe 1 in this manner, they can be freely moved axially to be positioned. If there is fluid leakage from the cracked portion 1a or deteriorated portion 1b, the caps 75, 75 of the cylindrical bodies 7, 7 may be loosened as described above, or the caps 75, 75 may be removed and the through holes 74, 74 opened to discharge the fluid to the outside. Also, as described above, the dividing surfaces of the flange portions 71a, 71a of the divided members 71, 71 (the circumferential ends of the divided members 71, 71) may be in the same position circumferentially or in different positions circumferentially.

[0040] Next, as shown in Figure 12, the connecting means 8 is assembled to connect the cylindrical bodies 7, 7 in the axial direction, thereby forming the housing 5. As a result, the cylindrical bodies 7, 7 are connected while being drawn closer to each other, and the connecting ends of the cylindrical bodies 7, 7 are sealed.

[0041] Then, as shown in Figure 13, the assembly of the repair device 2 is completed by assembling the support means 6, 6 and fixing the housing 5 to the fluid pipe 1. In addition, in the repair device 2 assembled in this manner, filler material may be filled into the internal space of the repair device 2. In this case, the caps 75, 75 are removed and the through holes 74, 74 are opened, and while the air in the internal space of the repair device 2 is removed from one through hole 74, the filler material can be filled into the internal space of the repair device 2 through the other through hole 74. This means that even when three or more cylindrical bodies 7, 7, ... are connected, filling can be done using a single through hole 74, not just when two cylindrical bodies 7, 7 are connected.

[0042] As described above, the inner diameter of the cylindrical bodies 7,7 is formed to be larger than the outer diameter of the fluid pipe 1, allowing the fluid pipe 1 to be loosely fitted, and the cylindrical bodies 7,7 are sealed by a sealing member 83 positioned on the outer diameter side of the flange portions 72,73 to which they are connected. The housing 5 is supported on the fluid pipe 1 by support means 6,6 at a position axially outward from the damaged portion of the fluid pipe 1. At this time, the inner circumferential surface of the housing 5 and the outer circumferential surface of the fluid pipe 1 are spaced apart in the circumferential direction. As a result, the sealing member 83 that seals the gap between the flange portions 72,73 of the cylindrical bodies 7,7 does not come into contact with the outer surface of the fluid pipe 1, and the housing 5 is supported on the fluid pipe 1 by support means 6,6 at a position axially outward from the damaged portion of the fluid pipe 1. Therefore, the housing 5 can be fitted onto the fluid pipe 1 with the inner circumferential surface of the housing 5 and the outer circumferential surface of the fluid pipe 1 spaced apart, and the repair device 2 can be installed without putting a load on the damaged portion of the fluid pipe 1.

[0043] Furthermore, adjacent cylindrical bodies 7,7 are connected by a connecting housing 81 having recesses 82 that can be fitted onto opposing flange portions 72,73. Specifically, since the recesses 82 of the connecting housing 81 are fitted onto the opposing flange portions 72,73 in the circumferential direction, the adjacent cylindrical bodies 7,7 can be accurately connected while their axes are aligned.

[0044] Furthermore, the connecting housing 81 includes multiple arc-shaped members 84 divided in the circumferential direction, and T-head bolts 15 as fastening members that connect the arc-shaped members 84 in the circumferential direction, and the sealing member 83 is positioned between the recess 82 and the flanges 72, 73 of the connecting housing 81. With this configuration, the sealing member 83 is held between the recess 82 and the flanges 72, 73 of the connecting housing 81 by the fastening force of the T-head bolts 15, so that the connection work between adjacent cylindrical bodies 7, 7 and the sealing work between the flanges 72, 73 provided at the connecting ends of the cylindrical bodies can be performed in a series of steps.

[0045] Furthermore, a packing 10 extending in the axial direction is positioned between the opposing flange portions 71a, 71a of the two divided members 71, 71 constituting the cylindrical body 7, sealing the space between the flange portions 71a, 71a, and the third piece 14 of the packing 10 is in contact with the inner circumferential surface (bulging portion 85c) of the sealing member 83 of the connecting means 8. As a result, the sealing member 83 is pressed against the third piece 14 of the packing 10 by the fastening force of the T-head bolt 15, thus providing a high level of airtightness between the sealing member 83 and the packing 10.

[0046] Furthermore, the cylindrical body 7 is composed of two divided members 71, 71, and the connecting means 8 is composed of three arc-shaped members 84 and a seal divided body 85, with the circumferential ends of the divided members 71, 71 positioned at different circumferential positions from the circumferential ends of the seal divided body 85 (see Figures 2 and 16 in particular). That is, the divided ends of the packing 10 and the seal divided body 85 do not overlap in the circumferential direction, resulting in high sealing performance between the packing 10 and the seal member 83. Furthermore, the support means 6 is composed of three arc-shaped members 64 and an elastic divided body 65, with the circumferential ends of the divided members 71, 71 positioned at different circumferential positions from the circumferential ends of the elastic divided body 65 (see Figures 2 and 17 in particular). That is, the divided ends of the packing 10 and the elastic divided body 65 do not overlap in the circumferential direction, resulting in high sealing performance between the packing 10 and the elastic member 63.

[0047] Furthermore, the flange portions 72 and 73 have inclined surfaces 72a and 73a that extend from their outer circumferential surfaces toward the outer circumferential surface of the cylindrical body 7, gradually decreasing in diameter. The inclined surfaces 72a and 73a of the flange portions 72 and 73 formed at the connecting ends of the cylindrical bodies 7, 7 are pressed against the inner diameter side edges of the recesses 82 of the connecting housing 81, thereby connecting the cylindrical bodies 7, 7 closer together. In addition, the inclined surfaces 72a and 73a of the flange portions 72 and 73 formed at both axial ends of the housing 5 are pressed against the inner diameter side edges of the recesses 62b and 62b of the support means 6, 6, thereby separating the cylindrical bodies 7, 7 from each other. In this manner, with the housing 5 fixed to the fluid tube 1, axial pulling forces act on both ends of each cylindrical body 7, 7, thereby improving the sealing between the elastic member 63 and the cylindrical body 7, and allowing the cylindrical bodies 7, 7 to be connected linearly in the axial direction. For example, this prevents the connecting ends of the cylindrical bodies 7, 7 from falling due to their own weight and bending into a roughly V-shape.

[0048] Furthermore, the cylindrical body 7 has a symmetrical shape with respect to a line perpendicular to the axial direction. Specifically, the flanges 72 and 73 formed at both ends of the cylindrical body 7 in the axial direction have the same shape, so the housing 5 can be constructed regardless of the orientation of the cylindrical bodies 7, 7.

[0049] Furthermore, the support means 6 includes an annular end housing 61 and an annular elastic member 63 positioned on the inner diameter side of the end housing 61 to seal the space between the end housing 61 and the fluid pipe 1. The elastic member 63 is pressed against the outer circumferential surface of the fluid pipe 1 at a position on the inner diameter side of the cylindrical body 7. As a result, since the elastic member 63 is interposed between the end housing 61 and the fluid pipe 1, it is possible to prevent the outer circumferential surface of the fluid pipe 1 from being gouged, etc., compared to a configuration in which the housing 5 is supported on the fluid pipe 1 with hard members such as bolts or thrust rings. In addition, since the housing 5 is supported on the fluid pipe 1 using the elastic member 63 that seals both axial ends of the housing 5, it is not necessary to prepare a separate member for supporting the housing 5 on the fluid pipe 1, and the number of parts can be reduced. Furthermore, with the elastic member 63 fitted into the recess 62a of the end housing 61 pressed against the outer circumferential surface of the fluid pipe 1, the flange portion 72 of the cylindrical body 7 is loosely fitted radially into the recess 62b. More specifically, the inner circumferential surface of the flange portion 72 of the cylindrical body 7 fitted into the recess 62b is spaced apart from the outer circumferential surface of the fluid pipe 1 along its entire circumference. Therefore, the cylindrical body 7 does not impose an inward radial load on the fluid pipe 1, thus preventing damage to the fluid pipe 1.

[0050] In particular, in the case of the water pipe bridge 1A as in this embodiment, for example, an air valve is installed as shown in Figure 1, and the design for air venting is inclined upward toward this air valve. Also, for example, the axes of each fluid pipe 1 may be misaligned due to the weight of each fluid pipe 1 when connected, or the pipeline may bend when connected, resulting in a non-linear connection. However, since the inner surface of the housing 5 and the outer surface of the fluid pipes 1 are spaced apart, even if the fluid pipes 1 are connected non-linearly, they will not come into contact with the inner surface of the housing 5, thus suppressing the load on the fluid pipes 1. Furthermore, even if a convex portion such as a welding bead is formed on the outer surface of the fluid pipe 1, it will not come into contact with the inner surface of the housing 5, thus suppressing the load on the fluid pipes 1. Moreover, the housing 5 is supported by the elastic member 63 of the support means 6, and the inner surface of the end housing 61 is also spaced apart from the outer surface of the fluid pipes 1. Therefore, even if the fluid pipes 1 are connected non-linearly, they will not come into direct contact with the inner surface of the end housing 61, and the impact can be absorbed.

[0051] Furthermore, the cylindrical body 7 is equipped with a through-hole 74 that penetrates radially and a cap 75 that can open and close the through-hole 74. With this configuration, by operating the cap 75 to remove or loosen it from the through-hole 74 and open the through-hole 74, air or liquid present between the fluid pipe 1 and the housing 5 can be discharged to the outside, thereby preventing the internal space of the repair device 2 from becoming high pressure. In addition, it is possible to fill the internal space of the repair device 2 with filler material through the other through-hole 74 while simultaneously removing air from the internal space of the repair device 2 through one through-hole 74.

[0052] In this embodiment, the support means 6 is composed of an end housing 61 and an elastic member 63, and the housing 5 is supported on the fluid pipe 1 by the elastic force of the elastic member 63. However, the embodiment is not limited to this, and for example, a bolt may be provided separately from the elastic member 63, and the housing 5 may be supported on the fluid pipe 1 by biting the bolt into the outer surface of the fluid pipe 1.

[0053] Furthermore, although this embodiment illustrates a configuration in which the cylindrical bodies 7,7 are connected by a connecting means 8, the cylindrical bodies 7,7 may also be connected axially using bolts and nuts that extend in the axial direction.

[0054] Furthermore, although this embodiment illustrates a configuration in which the cylindrical body 7 has a symmetrical shape in the axial direction, the cylindrical body may also have an asymmetrical shape in the axial direction. For example, the flanges formed at both ends of the cylindrical body may be formed in different shapes, or a flange may be formed on only one side of the cylindrical body in the axial direction, and no flange may be formed on the other side. Alternatively, for example, the flanges may be intermittently provided on the outer diameter side in the circumferential or axial direction.

[0055] Next, the installation procedure for the repair device 2 when there are obstacles 18 around the fluid pipe 1 and the workspace for installing the repair device 2 is limited will be explained based on Figures 14 to 17.

[0056] As shown in Figure 14, aqueduct bridges 1A are often installed along the extension direction of structures such as roads, railways, and bridges. For example, an obstacle 18 made of concrete or similar material may be placed to cover the area adjacent to one side and above the aqueduct bridge 1A (hereinafter referred to as the closed area S) in an inverted L-shape in cross-section. In such cases, scaffolding 17 is erected near the aqueduct bridge 1A, and the repair device 2 is installed from the open area on the other side of the aqueduct bridge 1A (hereinafter referred to as the open area T).

[0057] As shown in Figure 15(a), first, one of the divided members 71 is fitted onto the fluid pipe 1 constituting the water pipe bridge 1A from the open region T on the other side in the lateral direction. Then, the divided member 71 is rotated along the outer surface of the fluid pipe 1 and moved to the closed region S side. Next, as shown in Figure 15(b), the other divided member 71 is fitted onto the fluid pipe 1 from the open region T side. At this time, the flange portions 71a, 71a of the divided members 71, 71 positioned on the open region T side of the fluid pipe 1 are temporarily assembled by attaching T-head bolts and nuts 9 from the open region T side of the fluid pipe 1. In this state, the divided members 71, 71 are rotated to position the other flange portion 71a, 71a on the closed region S side, and the T-head bolts and nuts 9 are temporarily assembled by attaching them from the open region T side of the fluid pipe 1. This prevents the temporarily assembled divided members 71, 71 from falling from the fluid pipe 1.

[0058] Subsequently, as shown in Figure 15(c), the cylindrical body 7 is constructed by rotating the divided members 71, 71 while tightening the T-head bolts and nuts 9 on both radial sides from the open region T side of the fluid pipe 1. By tightening the cylindrical body 7 while rotating it in this way, it becomes possible to tighten the T-head bolts and nuts 9 located on the closed region S side. Another cylindrical body 7 is constructed using the same process as described above. Then, as shown in Figure 15(d), the cylindrical body 7 is rotated so that the through hole 74 is positioned at the top. Since the inner diameter of the cylindrical body 7 is formed to be larger than the outer diameter of the fluid pipe 1, it can be rotated freely. In this state, the upper part of the cylindrical body 7 is resting on the upper part of the fluid pipe 1. Alternatively, for example, the insertion direction of the T-head bolts and nuts 9 may be reversed, and the T-head bolts and nuts 9 located on the closed region S side may be tightened first, and then the divided members 71, 71 may be rotated to tighten the T-head bolts and nuts 9 located on the open region T side.

[0059] Next, as shown in Figure 16(a), with the connecting ends of the cylindrical bodies 7, 7 close together in the axial direction, the arc-shaped member 84 is fitted onto the flanges 72, 73 of the cylindrical bodies 7, 7 from the open region T side of the fluid pipe 1, and moved circumferentially along the flanges 72, 73 toward the closed region S side of the fluid pipe 1, while another arc-shaped member 84 is fitted onto the flanges 72, 73 from the open region T side of the fluid pipe 1. Then, as shown in Figure 16(b), the connecting flanges 84a, 84a of the arc-shaped members 84, 84 are fastened together with T-head bolts 15 from the open region T side of the fluid pipe 1 to connect them. At this time, the seal division 85 is fitted onto the arc-shaped member 84, making assembly easy. Also, the T-head bolts 15 located on the closed region S side are already fastened.

[0060] Next, as shown in Figure 16(c), the connected arc-shaped members 84, 84 are moved circumferentially toward the closed region S side of the fluid pipe 1, and another arc-shaped member 84 is fitted onto the flanges 72, 73 from the open region T side of the fluid pipe 1. Then, as shown in Figure 16(d), the connecting flanges 84a, 84a of the arc-shaped members 84 and the connecting flanges 84a, 84a at both ends of the connected arc-shaped members 84, 84 are connected by T-head bolts 15, thereby forming a connecting means 8, and the cylindrical bodies 7, 7 are connected axially to form the housing 5. At this time, the connecting ends of each arc-shaped member 84 (the connecting ends of the seal divisions 85) are offset circumferentially from the connecting ends of the division members 71, 71 (the position of the packing 10), so the sealing performance is high. Alternatively, for example, the arc-shaped members 84, 84, 84 may be temporarily assembled with T-head bolts 15 to form the connecting means 8, and then the T-head bolts 15 may be fully tightened.

[0061] Next, as shown in Figure 17(a), the arc-shaped members 64 are fitted onto the flanges 72 and 73 formed at both ends of the housing 5 from the open region T side of the fluid pipe 1, and moved circumferentially along the flanges 72 and 73 toward the closed region S side of the fluid pipe 1, while another arc-shaped member 64 is fitted onto the flanges 72 and 73 from the open region T side of the fluid pipe 1. Then, as shown in Figure 17(b), the connecting flanges 64a and 64a of the arc-shaped members 64 are fastened together with T-head bolts 16 from the open region T side of the fluid pipe 1 to connect them. At this time, elastic segmented members 65 are fitted onto the arc-shaped members 64, making assembly easy. Also, the T-head bolts 16 located on the closed region S side are already fastened.

[0062] Next, as shown in Figure 17(c), the connected arc-shaped members 64, 64 are moved circumferentially toward the closed region S side of the fluid pipe 1, and another arc-shaped member 64 is fitted onto the flanges 72, 73 from the open region T side of the fluid pipe 1. Then, the connecting flanges 64a, 64a of the arc-shaped members 64 and the connecting flanges 64a, 64a at both ends of the connected arc-shaped members 64, 64 are connected with T-head bolts 16 to form a support means 6, thereby installing the repair device 2 so that it fits onto the fluid pipe 1. At this time, the connecting ends of each arc-shaped member 64 (connecting ends of elastic divided members 65) are offset circumferentially from the connecting ends of divided members 71, 71 (position of packing 10), so the sealing performance is high. Alternatively, for example, the arc-shaped members 64, 64, 64 may be temporarily assembled with T-head bolts 16 to form the support means 6, and then the T-head bolts 16 may be fully tightened.

[0063] In this way, the divided members 71, 71 of the cylindrical body 7, the arc-shaped members 84, 84 of the connecting means 8, and the arc-shaped members 64, 64 of the support means 6 are gradually connected and assembled while rotating them in the circumferential direction, so that the repair device 2 can be installed on the fluid pipe 1 even when the workspace is limited. This method can also be used even when the workspace is not limited, for example, when there is a lot of fluid leakage, by having an operator prevent the fluid from splashing out using the arc-shaped members 84, 84 and 64, 64.

[0064] Next, a modified example of the present invention, Part 1, will be described with reference to Figure 18. In this description, the support means 600, which is arranged on one axial side of the housing 5, will be explained.

[0065] As shown in Figure 18, the support means 600 of this modified example 1 includes an end housing 610 and an elastic member 630. The elastic member 630 extends inclined toward the inner diameter side and toward the housing 5 side (not shown) from a fitting portion 650g that fits into a recess 620a of the end housing 610, and an axial gap is formed between it and the wall portion 610a on one axial side of the end housing 610. When the support means 600 is attached to the axial end of the housing 5, the inner diameter side tip 650c of the elastic member 630 comes into contact with the housing 5 and the fluid pipe 1. Furthermore, when the inner diameter side tip 650c of the elastic member 630 comes into contact with the housing 5 and the fluid pipe 1, it can elastically deform into the gap between the elastic member 630 and the wall portion 610a to improve sealing performance. In this way, the shape of the elastic member of the support means can be freely changed.

[0066] Next, a second modification of the present invention will be described with reference to Figure 19. Here, a connecting housing 810 is used as an example, but the invention can also be applied to the end housing of a support means.

[0067] As shown in Figure 19, the connecting housing 810 of this modified example 2 is composed of three arc-shaped members 840a, 840b, and 840c that are divided substantially equally in the circumferential direction. Holes 840d that penetrate axially are formed at corresponding positions at the ends of the arc-shaped members 840a and 840b, and the shafts of the bolts and nuts 30 are inserted through each hole 840d. These arc-shaped members 840a and 840b are connected so as to be rotatable around the shafts of the bolts and nuts 30. In addition, the arc-shaped member 840c is connected to both ends of the arc-shaped members 840a and 840b. This makes it easier to assemble the connecting housing 810 by connecting the arc-shaped members 840a, 840b, and 840c in the circumferential direction of the connecting ends of the cylindrical bodies 7, 7.

[0068] Next, a third modification of the present invention will be described with reference to Figure 20. While a connecting means is used as an example here, the invention can also be applied to a supporting means.

[0069] As shown in Figure 20(a), the connecting housing 811 of this modified example 3 is composed of three arc-shaped members 841a, 841b, and 841c. The arc-shaped member 841a is an arc that cuts the connecting housing 811 in half, while the arc-shaped members 841b and 841c are substantially the same shape and each has an arc shape with a central angle of approximately 90 degrees. That is, the arc-shaped member 841a and the arc-shaped members 841b and 841c have different circumferential lengths, with the latter having approximately twice the circumferential length.

[0070] Furthermore, as shown in Figure 20(b), the seal member 831 of this modified example 3 is composed of three seal divisions 851a, 851b, and 851c, which are fitted to the arc-shaped members 841a, 841b, and 841c described above. The seal division 851a is an arc shape formed by cutting the seal member 83 in half, and has approximately the same length as the arc-shaped member 841a. The seal divisions 851b and 851c are approximately the same shape as each other, each forming an arc shape with a central angle of approximately 90 degrees, and have approximately the same length as the arc-shaped members 841b and 841c. In other words, the seal division 851a and the seal divisions 851b and 851c have different circumferential lengths, with the latter having approximately twice the circumferential length. In this way, the lengths of the arc-shaped members constituting the connecting housing and the seal divisions constituting the seal member can be freely changed.

[0071] Next, a fourth modification of the present invention will be described with reference to Figure 21. While a connecting means is used as an example here, the invention can also be applied to a supporting means.

[0072] As shown in Figure 21(a), the connecting housing 812 of this modified example 4 is composed of three arc-shaped members 842a, 842b, and 842c that are substantially the same shape and are divided substantially equally in the circumferential direction. Also, as shown in Figure 21(b), the sealing member 832 of this modified example 4 is composed of two sealing divisions 852a and 852b. The circumferential length of the sealing division 852a is approximately 2 / 3 of the total length of the sealing member 832, and the circumferential length of the sealing division 852b is approximately 1 / 3 of the total length of the sealing member 832. The sealing division 852a is fitted into the two arc-shaped members 842a and 842b, and the sealing division 852b is fitted into the remaining arc-shaped member 842c. Thus, the number of divisions of the connecting housing and the sealing member may differ. Furthermore, even if the number of divisions between the connecting housing and the sealing member is the same, the circumferential length of the arc-shaped member (divided body) constituting the connecting housing and the circumferential length of the sealing divided body constituting the sealing member may be different.

[0073] Next, a modified example 5 of the present invention will be described with reference to Figure 22. In this modified example 5, the flange portion 721 of the cylindrical body 700 has a convex portion 701 that protrudes annularly from its axial end face toward the opposing cylindrical body 700' side, extending circumferentially. The flange portion 731 of the cylindrical body 700' has an annular recess 702 that loosely fits the convex portion 701, extending circumferentially, and an annular sealing member 833 is fitted into the recess 702. When the flange portions 721 and 731 of the cylindrical bodies 700 and 700' are connected by the connecting housing 813, the convex portion 701 is loosely fitted into the recess 702, and the sealing member 833 is compressed between the convex portion 701 and the recess 702. Thus, the sealing member 833 may be disposed between the end faces of the flange portions 721 and 731. Furthermore, for example, in the embodiment where the convex portion 701 and concave portion 702 are eliminated, a packing that is annular in front view and plate-shaped in side view may be inserted between the end faces of the cylindrical bodies 7, 7 to provide a seal. In this modified example, the sealing member 833 and the packing described above may be arranged to make contact within a range that does not affect the fluid pipe.

[0074] Next, a modification 6 of the present invention will be described with reference to Figure 23. In this modification 6, the cylindrical bodies 710 and 710' are connected by a connecting means 800 while spaced apart in the axial direction. The sealing member 834 of the connecting means 800 has a larger volume than the sealing member 83 of the embodiment, and is able to seal the gap between the end faces of the connected ends of the cylindrical bodies 710 and 710'.

[0075] 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.

[0076] For example, in the above embodiment, the housing 5 is constructed by connecting multiple cylindrical bodies 7, 7 of the same shape in the axial direction, but these cylindrical bodies are not necessarily limited to having the same shape, and for example, their axial lengths may differ from one another. [Explanation of Symbols]

[0077] 1 Fluid tube 1A Aqueduct Bridge 1a Cracked area (damaged area) 1b Deteriorated part (damaged part) 2. Repair device 5 cabinets 6 Support means 7. Cylindrical body 8 Connection means 10. Packing (sealing component) 15 T-head bolt (fastening member) 63 Elastic members 71 Divided members 72,73 Guard section 81 Connecting Housing (Connecting Ring) 82 recess 83 Sealing member 84. Arc-shaped member (divided body) 85 Seal divisions 600 Support means 630 Elastic member 700,700' tubular body 710,700' Cylindrical body 721,731 Tsuba (guard) 800 Connection means 810-813 Connecting Housing (Connecting Ring) 831-834 Sealing components

Claims

1. A method for attaching a fluid pipe repair device that seals onto a fluid pipe having an open region open to the side and a closed region, comprising at least a housing made of an annular cylindrical body made of a plurality of divided members in the circumferential direction, and an annular sealing member made of a plurality of divided sealing members in the circumferential direction, the device being fitted onto the fluid pipe having an open region open to the side and a closed region closed to the side, A method for installing a repair device, characterized in that a divided member in the open region is rotated along the outer surface of the fluid pipe to move to the closed region, then a new divided member is fitted onto the fluid pipe from the open region, and the divided member that has moved to the closed region and the new divided member are connected in the circumferential direction to generate a connected divided member, and this circumferential movement and connection process is repeated until the connected divided member forms an annular shape, thereby forming the housing; and a seal divided body in the open region is rotated along the outer surface of the fluid pipe to move to the closed region, then a new seal divided body is fitted onto the fluid pipe from the open region, and the seal divided body that has moved to the closed region and the new seal divided body are placed side by side in the circumferential direction, and this process is repeated until the seal divided body forms an annular shape, thereby forming the annular seal member.

2. The housing is constructed by connecting a plurality of the cylindrical bodies in the axial direction, The circumferential movement coupling process constitutes one of the cylindrical bodies, The method for mounting a repair device according to claim 1, characterized in that the circumferential movement connection step is repeated to form another cylindrical body among the cylindrical bodies, and the housing is formed by an axial connection step in which the one cylindrical body and the other cylindrical body are connected in the axial direction.

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