Split band

Abstract

To provide a split band which can be arranged at an outer periphery of a fluid supply pipe by easily arranging a plurality of split bodies at proper positions.SOLUTION: A split band comprises: a plurality of split bodies 10 arranged on an outer periphery of a fluid supply pipe 1; a packing 16 arranged on an inner peripheral side of the split bodies 10 and adhering to the outer periphery of the fluid supply pipe 1 with the plurality of split bodies 10 arranged on the outer periphery of the fluid supply pipe 1; and fastening members 2, 3 for fastening end parts of the split bodies 10 to one another, with the plurality of split bodies 10 arranged in a circumferential direction of the fluid supply pipe 1. The split bodies 10 have extension parts 12 extending outward in a radial direction of the fluid supply pipe 1 at both circumferential ends of the fluid supply pipe 1, Position regulation parts 14 for maintaining a relative positional relationship of the plurality of split bodies 10 with the end parts of the plurality of split bodies 10 connected to one another by the fastening members 2, 3 are formed on the extension parts 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a split band.

Background Art

[0002] Taking a water pipe as an example of a fluid supply pipe buried in the ground, the water pipes are often connected by welding. When the water pipes are used over a long period of time, due to aging deterioration, the influence of earthquakes, or vibrations associated with civil engineering work, etc., cracks may occur in some of the welded joints, leading to water leakage.

[0003] Patent Document 1 describes a repair band in which a flat rubber sealing material coated with a liquid lubricant is installed inside a band member formed of a thin metal plate, and the sealing material is arranged around the entire circumference of the leakage occurrence part of a pipe body (fluid supply pipe).

[0004] Patent Document 2 shows a repair pipe joint having a divided arc-shaped housing and a sealing ring housed inside the receiving part of this housing, and forming tightening seats at both ends of the housing. A configuration is described in which a plurality of housings having such a structure are arranged on the outer periphery of an existing pipeline (fluid supply pipe), and the housing is fixed so as to surround the outer periphery of the existing pipeline by fastening the tightening seats with bolts and nuts.

[0005] Patent Document 3 describes a pressing ring that is attached to the outer periphery of an insertion pipe part inserted into a receiving pipe part and presses a sealing material that seals between the inner periphery of the receiving pipe part and the outer periphery of the insertion pipe part. In this Patent Document 3, abutting surfaces facing in the pipe axis direction are formed at the ends of each of a plurality of divided pieces having an arc shape, and through holes along the pipe axis direction are formed in each of the abutting surfaces.

[0006] In this Patent Document 3, the segmented pieces are connected by inserting bolts through their respective through holes while the contact surfaces at adjacent positions are in contact. This achieves the distribution of stress that tends to concentrate at the ends of the segmented pieces. Furthermore, this thrust ring is fixed to the outer circumference of the insertion pipe section, and pressure is applied to the sealing material from multiple thrust bolts. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 7-19388 [Patent Document 2] Japanese Patent Application Publication No. 5-118491 [Patent Document 3] Japanese Patent Publication No. 2012-17811 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The repair band described in Patent Document 1 allows for sealing by applying relatively uniform pressure to the entire circumference of the water pipe, but it has many movable parts and tends to be complex. The repair pipe joint described in Patent Document 2 has a simpler structure and is easier to install compared to the configuration in Patent Document 1. The thrust ring described in Patent Document 3 is not suitable for suppressing water leakage at welded joints, but it allows for installation by applying uniform pressure to the outer circumference of the water pipe.

[0009] For example, as a segmented band for suppressing water leakage at welded joints of large-diameter water pipes, one can consider a configuration in which multiple housings (hereinafter referred to as segmented bodies) are arranged around the outer circumference of a fluid supply pipe and the ends of each fluid supply pipe are connected, as described in Patent Document 2.

[0010] This type of segmented band is simple, and by increasing the number of segments, it reduces the weight of each segment and makes them easier to handle.

[0011] However, when the number of segments increases, there was concern that it would become difficult to properly maintain the relative positions of the segments when connecting them, even if each segment was temporarily fastened with bolts.

[0012] For these reasons, there is a need for a segmented band that can be easily positioned in the correct locations and placed around the outer circumference of a fluid supply pipe. [Means for solving the problem]

[0013] The characteristic configuration of the divided band according to the present invention comprises a plurality of divided bodies arranged on the outer circumference of a fluid supply pipe, a packing provided on the inner circumference side of the divided bodies and in close contact with the outer circumference of the fluid supply pipe when the plurality of divided bodies are arranged on the outer circumference of the fluid supply pipe, and a fastening member that fastens the ends of each of the divided bodies together when the plurality of divided bodies are arranged in the circumferential direction of the fluid supply pipe, wherein the divided bodies have extensions at both ends in the circumferential direction of the fluid supply pipe that extend radially outward from the fluid supply pipe, and a position regulating portion that maintains the relative positional relationship of the plurality of divided bodies is formed in at least one of the extensions when the ends of the plurality of divided bodies are connected by the fastening member.

[0014] According to this characteristic configuration, for example, by arranging multiple divided parts along the circumferential direction of the fluid supply pipe so as to surround the outer circumference of the welded area of ​​the fluid supply pipe and fastening them with fastening members, the packing of the divided parts adheres tightly to the outer circumference of the welded area, thus preventing fluid leakage in the event of a crack in the welded area. In particular, with this characteristic configuration, even when the ends of multiple divided parts are temporarily fastened together using fastening members such as bolts, the relative positional relationship of the divided parts can be maintained by the positional regulating part formed on the extension, making it possible to properly maintain the relative positional relationship of multiple divided parts that are adjacent to each other when fastening multiple divided parts together. Therefore, a segmented band was constructed that allows multiple housings to be easily positioned in the correct locations and placed around the outer circumference of the fluid supply pipe.

[0015] In addition to the above configuration, the position regulating portion comprises a first plate extending circumferentially outward from the fluid supply pipe from one axial side of the fluid supply pipe among the extensions at both ends, and a second plate extending circumferentially outward from the other axial side of the fluid supply pipe among the other extensions at both ends, wherein with a plurality of the divided bodies arranged on the outer circumference of the fluid supply pipe, the first plate may abut against the opposite side of the second plate of the other circumferentially adjacent extension, and the second plate may abut against the opposite side of the first plate of one of the circumferentially adjacent extensions.

[0016] According to this configuration, with multiple segments arranged around the outer circumference of the fluid supply pipe, the first plate abuts against the side of the adjacent extension opposite to the second plate, and the second plate abuts against the side of the adjacent extension opposite to the first plate, thereby determining the relative positions of adjacent segments. In this configuration, when viewed along the radial direction of the fluid supply pipe, the first and second plates are positioned point-symmetrically with respect to the midpoint of the longitudinal direction of the segments. Therefore, it is possible to determine the relative positional relationship of multiple segments regardless of their orientation relative to the outer circumference of the fluid supply pipe, making it easier to handle the segments.

[0017] In addition to the above configuration, the four divided bodies may be arranged in the circumferential direction around the outer circumference of the fluid supply pipe.

[0018] According to this design, four segmented components will be placed around the outer circumference of the fluid supply pipe to cover the entire circumference, which will allow for lighter components and easier installation.

[0019] In addition to the above configuration, the packing may be attached to the welded portion extending circumferentially to the fluid supply pipe, and may have a central groove formed in the center in the width direction so as to straddle the welded portion and be in close contact with the outer circumference of the fluid supply pipe.

[0020] According to this, by positioning the central groove portion of the packing so as to straddle the welded portion of the fluid supply pipe and arranging a plurality of divided bodies, and fastening each divided body, the packing does not directly apply pressure to the welding location. Also, in a state where the plurality of divided bodies are fastened, portions other than the central groove portion of the packing adhere to the outer periphery of the fluid supply pipe, and even when fluid leaks from the welding location, the fluid is confined inside the central groove portion of the packing, suppressing the leakage.

[0021] As a configuration added to the above configuration, the packing integrally forms protruding portions that protrude radially outward of the fluid supply pipe at both ends of the divided body. When a plurality of the divided bodies are arranged on the outer periphery of the fluid supply pipe and adjacent divided bodies are pulled toward each other by the fastening member, the protruding portions may be sandwiched between adjacent divided bodies.

[0022] According to this, by arranging a plurality of divided bodies on the outer periphery of the fluid supply pipe and fastening the ends of adjacent divided bodies with a fastening member, the ends of adjacent divided bodies are pulled toward each other, and at the boundary portion between adjacent divided bodies, the adjacent protruding portions of the packing of each divided body are in a state of being in close contact with each other and are sandwiched between the ends of each divided body. By being sandwiched in this way, the protruding portions of adjacent packings are compressed in a state of being in close contact with each other, and there is no inconvenience of fluid leaking between adjacent protruding portions.

Brief Description of the Drawings

[0023] [Figure 1] It is a perspective view of a split band attached to a water pipe. [Figure 2] It is a plan view of a split band attached to a water pipe. [Figure 3] It is a front view of a split band attached to a water pipe. [Figure 4] It is a cross-sectional view of a split band attached to a water pipe. [Figure 5] It is a plan view of a divided body. [Figure 6] It is a front view of a divided body. [Figure 7] It is a bottom view of a divided body. [Figure 8] This is a perspective view of the divided bands. [Figure 9] This is a front view of the divided band in its disassembled state. [Figure 10] This is a front view of the disassembled split band of another embodiment (a). [Figure 11] This is a front view of the split band in the fastened state according to another embodiment (a). [Figure 12] This is a perspective view showing the position regulating part of another embodiment (b). [Modes for carrying out the invention]

[0024] Embodiments of the present invention will be described below with reference to the drawings. [Basic configuration] As shown in Figures 1 to 3, the divided band A is composed of four (or more) divided bodies 10 arranged on the outer circumference of a water pipe 1, which is an example of a fluid supply pipe; packings 16 provided on the inner circumference of each divided body 10, which are in close contact with the outer circumference of the water pipe 1 when the divided bodies 10 are arranged on the outer circumference of the water pipe 1; and bolts 2 and nuts 3 as fastening members that fasten the ends of the four divided bodies 10 together.

[0025] This divided band A is used, for example, before burying the water pipe 1, by arranging four divided parts 10 so as to cover the entire circumference of the welded portion 1W (weld bead portion) of the water pipe 1 that is joined by welding as shown in Figure 4, and fastening each divided part 10 with bolts 2 and nuts 3. In this way, the four divided parts 10 are attached to the outer circumference of the water pipe 1 with the packing 16 of the four divided parts 10 covering the welded portion 1W.

[0026] Furthermore, due to aging deterioration of the welded joint 1W, the effects of earthquakes, or vibrations associated with civil engineering work, minute cracks may occur in the welded joint 1W (weld bead portion), which can lead to water leakage. Therefore, by installing the split band A, the packing 16 prevents water leakage to the outside.

[0027] [Divided body] In the following explanation, "radial direction" refers to the radial direction toward the center of the water pipe 1 when the divided body 10 is attached to the water pipe 1 (sometimes referred to as the radial direction of the water pipe 1), the outer surface in the radial direction is referred to as the outer circumference, and the inner surface in the radial direction is referred to as the inner circumference.

[0028] Furthermore, in the following explanation, "axial direction" refers to the axial direction along the central axis of the water pipe 1 when the divided body 10 is attached to the water pipe 1 (sometimes referred to as the axial direction of the water pipe 1), and the side surface of the divided body 10 is the surface positioned at the axial end.

[0029] Furthermore, in the following explanation, "circumferential direction" refers to the circumferential direction along the outer circumference of the water pipe 1 when the divided body 10 is attached to the water pipe 1 (sometimes referred to as the circumferential direction of the water pipe 1), and the end of the divided body 10 refers to the end in the circumferential direction.

[0030] As shown in Figures 1 and 5 to 9, the divided body 10 is manufactured as a cast iron, and extensions 12 that extend radially outward from the water pipe 1 are integrally formed at both ends of the arc-shaped main body 11. These extensions 12 function as flanges, and bolt holes 13 that penetrate in the circumferential direction are formed in each extension 12. The surface of the extension 12 that faces an adjacent extension 12 is called the end face 12f.

[0031] As shown in Figures 6 and 8, a first plate 14a is formed on one of the pair of extensions 12, extending in the circumferential direction of the water pipe 1 from one axial side of the water pipe 1. Similarly, a second plate 14b is formed on the other of the pair of extensions 12, extending in the circumferential direction of the water pipe 1 from the other axial side of the water pipe 1. The first plate 14a and the second plate 14b are specific examples of the position regulating portion 14.

[0032] The position regulating section 14 has a first plate 14a and a second plate 14b. When the ends of the four divided bodies 10 are connected by bolts 2 and nuts 3 as fastening members, the first plate 14a and the second plate 14b abut against the side surfaces of the extended portions 12 of the divided bodies 10 at adjacent positions, thereby maintaining the relative positional relationship of the four divided bodies 10. Note that the higher-level concept of the first plate 14a and the second plate 14b is sometimes simply referred to as a plate.

[0033] As can be seen from Figures 5 to 8, in a view along the radial direction of the water pipe 1 (fluid supply pipe), the divided body 10 is positioned with point symmetry between the first plate 14a and the second plate 14b, with the midpoint of the longitudinal direction as the point of symmetry. As a result, the shapes obtained by rotating the divided body 10 180 degrees around the point of symmetry are the same. In other words, all four divided bodies 10 used in the dividing band A have the same shape (common shape).

[0034] In these figures, the first plate 14a and the second plate 14b are given different reference numerals to clarify the positional relationship of the position restricting portion 14. However, if the orientation of the divided body 10 is changed so that the ends are swapped, only the reference numerals of the plates will be swapped in the drawings, the shape of the plates will be the same, and the position restricting portion 14 will function in the same way.

[0035] As shown in Figures 2 and 5, the width of the pair of extensions 12 formed on one divided body 10 (the width in the axial direction of the water pipe 1) is equal to the width of the main body 11 of the divided body 10, and the first plate 14a and the second plate 14b are formed at a position where they overhang outward in the width direction from the extensions 12 by their respective thicknesses. Furthermore, of the pair of extensions 12, the side opposite to the side on which the plates (first plate 14a, second plate 14b) are formed is called the side surface.

[0036] As a result, by placing the divided body 10 equipped with the packing 16 on the outer circumference of the water pipe 1 and fastening it with bolts 2 and nuts 3 (including temporary fastening), the inner surface 14s of the first plate 14a abuts against the side surface of the extended portion 12 of the adjacent divided body 10, and the inner surface 14s of the second plate 14b abuts against the side surface of the extended portion 12 of the adjacent divided body 10. As a result, the relative positional relationship of the four divided bodies 10 is maintained.

[0037] In Figure 9, two connecting units are created by temporarily connecting the two divided parts 10 with bolts 2 and nuts 3, and the work configuration is shown in which these two connecting units are connected with bolts 2 and nuts 3. However, the order in which the four bolts 2 and nuts 3 are fastened can be set arbitrarily.

[0038] In this divided band A, since the four divided bodies 10 have a common shape, the positions of the divided bodies 10 can be restricted simply by arranging them along the outer circumference of the water pipe 1 without distinguishing the positions of the ends of the divided bodies 10, by bringing the inner surface 14s of the first plate 14a into contact with the side surface of the extension 12 adjacent to one end, and the inner surface 14s of the second plate 14b into contact with the side surface of the extension 12 adjacent to the other end.

[0039] 〔rubber seal〕 As shown in Figures 1, 4, 8, and 9, a fitting groove 10a is formed on the inner circumference of the divided body 10 at the center in the width direction, and a packing 16 is fitted into this fitting groove 10a.

[0040] The packing 16 is made of rubber or a flexible resin material, is generally arc-shaped, and has a length (arc length) that follows the inner circumference of a single segmented body 10, with projections 16T that protrude radially outward at both ends integrally molded. On the inner circumference of the packing 16, a central groove 16a is formed at the center in the width direction, and auxiliary grooves 16b are formed on each of the sides of the central groove 16a.

[0041] With this configuration, the packing 16 adheres tightly to the outer circumference of the water pipe 1, spanning the welded portion 1W via the central groove 16a, and further, the auxiliary grooves 16b on the outside in the width direction allow the packing 16 to deform flexibly, creating good adhesion.

[0042] In particular, when the divided body 10 is attached to the water pipe 1, as shown in Figure 4, the positional relationship between the divided body 10 and the packing 16 is set such that the packing 16 is pressed against the water pipe 1 within the fitting groove 10a of the divided body 10, and the protruding portion 16T is also pressed against the extended portions 12. This constantly applies pressure from the divided body 10 to the packing 16, creating a good seal.

[0043] The inner surface of the protruding portion 16T of the packing 16 (the side opposite to the extended portion 12 of the divided body 10 that supports the packing 16) is molded to be flat.

[0044] [Installation process] As the divided body 10 is constructed in this manner, as shown in Figures 1 and 2, the four divided bodies 10, each with a packing 16 on its inner circumference, are arranged along the circumferential direction of the water pipe 1. After temporarily fastening them with bolts 2 and nuts 3, the four divided bodies 10 can then be tightly secured to the outer circumference of the water pipe 1 by fastening with bolts 2 and nuts 3.

[0045] With the split band A installed, the inner circumference of the packing 16 is in close contact with the outer circumference of the water pipe 1, and a pair of opposing protrusions 16T of the four packings 16 are in close contact. Furthermore, the fastening with the bolts 2 and nuts 3 causes the adjacent extensions 12 to be pulled towards each other, so that the protrusions 16T of the packing 16 are sandwiched between the pair of extensions 12, resulting in close contact between the pair of protrusions 16T and achieving good sealing performance.

[0046] As a result, even if minute cracks occur in the welded part 1W (weld bead portion) due to aging deterioration of the welded part 1W, the effects of earthquakes, or vibrations associated with civil engineering work, the packing 16 prevents water from leaking out of the water pipe 1 to the outside.

[0047] [Effects of the Embodiment] This divided band A reduces the weight of a single divided body 10 by using four divided bodies 10, making it easier to install on large-diameter water pipes 1. Furthermore, although positioning is necessary when fastening the ends of the four divided bodies 10 together, as shown in Figure 8, a first plate 14a and a second plate 14b are formed at the ends as position regulating parts 14. Therefore, simply by fastening the bolts 2 and nuts 3, the ends are positioned together, and the four divided bodies 10 can be arranged linearly along the circumferential direction of the water pipe 1.

[0048] Furthermore, since all four divided bodies 10 have the same shape (common shape), they can be placed on the outer circumference of the water pipe 1 without having to choose the relative positions of the ends. Even when the ends of multiple divided bodies 10 are temporarily fastened with bolts 2 and nuts 3, the first plate 14a and the second plate 14b come into contact with the corresponding side surfaces of the extension 12, and the positions of the divided bodies 10 are not disturbed.

[0049] By using four divided sections 10 in this way, for example, when the divided sections 10 are attached to the outer circumference of the water pipe 1, the disadvantage of the compressive force acting on the packing 16 at both ends of the divided sections 10 being greater than the compressive force at other parts is suppressed, and it becomes possible to apply uniform pressure to the packing 16 and make it tightly adhere to the outer circumference of the water pipe 1.

[0050] Furthermore, when the divided band A is attached to the water pipe 1, the central groove portion 16a of the packing 16 is positioned so as to overlap the outer circumference of the welded portion 1W, and the external position of the central groove portion 16a in the width direction is positioned to straddle the welded portion 1W of the water pipe 1, thereby providing good sealing performance.

[0051] [Another embodiment] The present invention may also be configured as follows, in addition to the embodiments described above (parts having the same functions as the embodiments are given the same numbers and reference numerals as the embodiments).

[0052] (a) The packing 16 is constructed as shown in Figures 10 and 11. In this alternative embodiment (a), the packing 16 is placed on the inner circumference of each of the four divided bodies 10, and tapered portions 16c are formed at both ends of the packing 16 so that it becomes thinner towards the ends, with the outer circumference removed at one end and the inner circumference removed at the other end.

[0053] When the packing 16 is constructed in this way, the four divided parts 10 are attached to the outer circumference of the water pipe 1, and the inclined surfaces of the tapered portions 16c at opposing positions come into close contact with each other. This applies radial pressure to each tapered portion 16c, making it possible to tightly seal each tapered portion 16c without any gaps, thus achieving good adhesion.

[0054] In this alternative embodiment (a), four packings 16 were used as shown in Figure 10, but it is also conceivable to use a single packing 16 with tapered portions 16c formed at both ends instead. Note that this alternative embodiment (a) assumes a configuration without the protruding portion 16T described in the embodiment.

[0055] (b) The position regulating portion 14 is constructed as shown in Figure 12 by having an engaging pin 14P protruding circumferentially from the end face 12f of the extension portion 12, and by drilling an engaging hole 14Q through the end face 12f of the extension portion 12. These engaging pins 14P and engaging holes 14Q are positioned at opposite ends of the bolt hole 13.

[0056] The engaging pin 14P is insertable into the engaging hole 14Q of the extension portion 12 of the segmented body 10 at an adjacent position, and the configuration allows for the insertion of the engaging pin 14P protruding from the extension portion 12 of the segmented body 10 at an adjacent position into the engaging hole 14Q of the extension portion 12.

[0057] In this alternative embodiment (b), the position regulating section 14 is positioned on the outer circumference of the water pipe 1, and when the divided body 10 equipped with a packing 16 is temporarily fastened with a bolt 2 and a nut 3, the engagement pin 14P and the engagement hole 14Q engage with each other, thereby suppressing displacement in the form of rotation around the bolt 2 of adjacent divided body 10. As a result, it becomes possible to determine and install the relative positional relationship of multiple divided body 10.

[0058] (c) The number of divisions 10 is not limited to four; it may be three or five or more.

[0059] (d) As a position regulating part 14, an engagement structure is formed on only one end of the divided body 10 that can engage with the end of an adjacent divided body 10. Possible engagement structures for this include a bifurcated member that abuts against the end of the main body 11 of an adjacent divided body 10 by sandwiching it from the width direction, or a contact piece that simply abuts against the side or outer surface of the end of the divided body 10.

[0060] (e) Multiple divided bodies 10, each having a position-regulating section 14, are arranged on the outer circumference of a water pipe 1, which is an example of a fluid supply pipe, and used as a split ring (for example, a split T-pipe used in a drilling machine) that is fixed to the water pipe 1. By configuring the split ring in this way, the work of arranging the multiple divided bodies 10 on the outer circumference of the water pipe 1 is made easier.

[0061] (f) The multiple divided bodies 10, each having a position-regulating portion 14, are used as compression rings that function to apply pressure to packings, etc., placed on the outer circumference of the water pipe 1 in a direction along the axial direction of the water pipe 1, as described in Patent Document 3. Even when used as compression rings in this way, the work of arranging the multiple divided bodies 10 on the outer circumference of the water pipe 1 is made easier.

[0062] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, provided that no inconsistencies arise. Moreover, the embodiments disclosed herein are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention. [Industrial applicability]

[0063] This invention can be used in a split band for attaching multiple divided parts to the outer circumference of a fluid supply pipe. [Explanation of Symbols]

[0064] 1 Water pipe (fluid supply pipe) 1W Weld 2 bolts (fastening members) 3. Nut (fastening component) 10 divided bodies 12 Extension 14 Position regulation part 14a Plate 1 14b Plate 2 16 Gasket 16a Central groove 16T protrusion A Split Band

Claims

1. Multiple segmented bodies are arranged around the outer circumference of the fluid supply pipe, A packing provided on the inner circumference side of the divided body, which is in close contact with the outer circumference of the fluid supply pipe when the multiple divided bodies are arranged on the outer circumference of the fluid supply pipe, The device comprises a plurality of the divided bodies arranged in the circumferential direction of the fluid supply pipe, and fastening members that fasten the ends of each divided body together. The divided body has extensions extending radially outward from the fluid supply pipe at both ends in the circumferential direction of the fluid supply pipe, and a position regulating portion is formed in at least one of the extensions to maintain the relative positional relationship of the multiple divided bodies when the ends of the multiple divided bodies are connected to each other by the fastening member. The position regulating portion comprises a first plate extending circumferentially outward from the fluid supply pipe from one of the axial side surfaces of the fluid supply pipe, which is one of the extension portions at both ends, and a second plate extending circumferentially outward from the other axial side surface of the fluid supply pipe, which is the other of the extension portions at both ends. A divided band in which a plurality of the divided bodies are arranged on the outer circumference of the fluid supply pipe, the first plate abuts against the opposite side of the second plate of the other circumferentially adjacent extension, and the second plate abuts against the opposite side of the first plate of the other circumferentially adjacent extension.

2. The dividing band according to claim 1, wherein the four divided bodies are arranged in the circumferential direction on the outer circumference of the fluid supply pipe.

3. It is attached to the welded portion extending circumferentially to the fluid supply pipe, The split band according to claim 1 or 2, wherein the packing has a central groove formed in the center in the width direction so as to straddle the welded portion and be in close contact with the outer circumference of the fluid supply pipe.

4. The packing has projections integrally formed on both ends of the divided body that protrude radially outward from the fluid supply pipe. A dividing band according to any one of claims 1 to 3, wherein a plurality of the divided bodies are arranged on the outer circumference of the fluid supply pipe, and the protruding portion is sandwiched between adjacent divided bodies when adjacent divided bodies are pulled together by the fastening member.

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