WO2018042577A1

WO2018042577A1 - Pipe reinforcing structure and pipe reinforcing method

Info

Publication number: WO2018042577A1
Application number: PCT/JP2016/075567
Authority: WO
Inventors: 西田　秀高; 栄郎松村; 啓司森下; 敏明片岡
Original assignee: 中国電力株式会社
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2018-03-08
Also published as: JP6142974B1; JPWO2018042577A1

Abstract

This reinforcing structure for reinforcing a pipe through which high temperature and high pressure steam flows, comprises: a first reinforcing member including a first curved plate part which is curved so as to face the outer circumferential surface of the pipe and including a first flange part which protrudes outward in the radial direction of the pipe from an end, in the circumferential direction, of the first curved plate part; a second reinforcing member including a second curved plate part which is curved so as to face the outer circumferential surface of the pipe and which is disposed to be adjacent, in the circumferential direction of the pipe, with the first curved plate part, and including a second flange part which protrudes outward in the radial direction of the pipe from an end, in the circumferential direction, of the second curved plate part and which is opposed to the first flange part; a fixation member for fixing the first flange part and the second flange part which are opposed to each other when the first reinforcing member and the second reinforcing member are placed on the outer circumferential surface of the pipe; and a foamed metal layer which is provided between the first reinforcing member and the pipe and between the second reinforcing member and the pipe and which is compressed and deformed in the radial direction of the pipe when the first flange part and the second flange part are fixed to each other.

Description

Piping reinforcement structure and piping reinforcement method

The present invention relates to a piping reinforcing structure and a piping reinforcing method.

High-temperature and high-pressure steam is used as power steam used as power for steam turbines and the like. Such piping for flowing high-temperature and high-pressure power steam may be deteriorated by creep. Patent Document 1 listed below describes a reinforcing tool including a plurality of metal reinforcing members each having a curved plate portion and a flange portion. In the reinforcing tool disclosed in Patent Document 1, a plurality of metal reinforcing members are disposed so as to surround a pipe, and adjacent flange portions are fixed to each other to reinforce the strength of the pipe.

JP 2014-005862 A

¡Piping is subject to variations in outer diameter and shape due to manufacturing variations. Moreover, in the welding part which welded piping, an unevenness | corrugation exists in the outer periphery of piping. Due to the variation in the shape of the piping and the presence of irregularities, there may be a gap between the piping and the reinforcing tool, making it difficult to reinforce the piping. When the shape is measured for each pipe to which the reinforcing tool is attached and the reinforcing tool is manufactured according to the shape of each pipe, the manufacturing cost may increase.

An object of the present invention is to solve the above problems and provide a pipe reinforcement structure and a pipe reinforcement method capable of reinforcing a pipe even when there is a variation in the shape of the pipe or unevenness. To do.

A pipe reinforcement structure according to an aspect of the present invention is a reinforcement structure that reinforces a pipe for flowing high-temperature and high-pressure steam, and includes a first curved plate portion that curves to face an outer peripheral surface of the pipe, A first reinforcing member having a first flange portion protruding outward in a radial direction of the pipe from a circumferential end portion of the one curved plate portion; A second curved plate portion arranged adjacent to the plate portion in the circumferential direction of the pipe; and a first flange portion projecting outward in the radial direction of the pipe from a circumferential end portion of the second curved plate portion. A second reinforcing member having a second flange portion opposed to the first flange member, and the first reinforcing member and the second reinforcing member, when the first reinforcing member and the second reinforcing member are disposed on an outer peripheral surface of the pipe, A fixing member for fixing the second flange portion, the first reinforcing member and the arrangement; And between the second reinforcing member and the pipe, and when the first flange portion and the second flange portion are fixed to each other, the foam metal that compressively deforms in the radial direction of the pipe And a layer.

According to this, since the foamed metal layer is provided between the first reinforcing member and the pipe and between the second reinforcing member and the pipe, the foamed metal layer is compressed and deformed corresponding to the shape of the pipe. Thus, it is possible to suppress the occurrence of a gap between each reinforcing member and the pipe. Therefore, even if there is a variation in the shape or irregularities of the pipes, the pipes can be reinforced by the reinforcing members.

As a desirable mode of the present invention, the foam metal layer is provided on the entire circumference in the circumferential direction of the pipe. According to this, the pipe can be reinforced in the entire circumference in the circumferential direction of the pipe.

As a desirable mode of the present invention, the first reinforcing member and the second reinforcing member extend in a direction along the axial direction of the pipe, and the foam metal layer includes the first reinforcing member and the second reinforcing member. It overlaps with the member and is provided in a direction along the axial direction of the pipe. According to this, it can suppress that a clearance gap arises between each reinforcement member and piping in the direction along the axial direction of piping, and can reinforce piping effectively.

As a desirable mode of the present invention, the foam metal layer is provided so as to cover a welded portion that protrudes radially outward from the outer peripheral surface of the pipe. According to this, since the foam metal layer is compressed and deformed corresponding to the unevenness of the welded portion, it is possible to suppress the generation of a gap in the vicinity of the welded portion.

As a desirable mode of the present invention, a plurality of the foam metal layers are provided on the outer peripheral surface of the pipe. According to this, according to the magnitude | size of the space | interval of each radial direction between each reinforcement member and piping, it is easy to provide a foam metal layer thickly, and can reinforce piping reliably.

As a desirable mode of the present invention, the foam metal layer is spirally wound around the outer peripheral surface of the pipe along the axial direction of the pipe. According to this, a foam metal layer can be easily provided in the direction along the axial direction of piping.

As a desirable aspect of the present invention, the inner diameter of the annular portion formed by the first curved plate portion and the second curved plate portion when the first flange portion and the second flange portion are brought into contact with each other, It is larger than the outer diameter of the pipe. According to this, even if the outer diameter of the pipe is small, the foamed metal layer is provided between the first curved plate portion and the second curved plate portion and the pipe, so the first curved plate portion and the second curved plate portion are provided. It can suppress that a clearance gap arises between a curved board part and piping.

As a desirable aspect of the present invention, the lengths of the first curved plate portion and the second curved plate portion in the axial direction of the pipe are respectively the first flange portion and the second flange portion of the pipe. Longer than the length in the axial direction. According to this, since the first curved plate portion and the second curved plate portion are provided longer than the first flange portion and the second flange portion, by fixing the first flange portion and the second flange portion, In the axial direction of the pipe, the pipe can be reinforced with respect to a portion wider than each flange portion.

As a desirable aspect of the present invention, the length of the first reinforcing member and the second reinforcing member in the axial direction of the pipe is three times or more the outer diameter of the pipe. According to this, generation | occurrence | production of the stress concentration of piping can be suppressed when the 1st reinforcement member and the 2nd reinforcement member are fixed.

As a desirable aspect of the present invention, the thicknesses of the first flange portion and the second flange portion in the circumferential direction of the pipe are respectively connected to the first curved plate portion and the second curved plate portion. Thicker than the outer part in the radial direction. According to this, generation | occurrence | production of the stress concentration in each connection location of a 1st flange part and a 2nd flange part can be suppressed.

A method for reinforcing a pipe according to an aspect of the present invention is a reinforcing method for reinforcing a pipe for flowing high-temperature and high-pressure steam, the step of winding a foam metal sheet around the outer peripheral surface of the pipe, the outer peripheral surface of the pipe, A first reinforcing member having a first curved plate portion that curves oppositely, and a first flange portion that protrudes outward in a radial direction of the pipe from a circumferential end portion of the first curved plate portion; A second reinforcing member having a second curved plate portion that is curved to face the outer peripheral surface of the pipe, and a second flange portion that protrudes radially outward from the circumferential end of the second curved plate portion. And arranging the first reinforcing member and the second reinforcing member so as to surround the outer peripheral surface of the pipe, and fixing the opposed first flange portion and second flange portion. The step of compressing and deforming the foam metal sheet in the radial direction of the pipe , Including the.

According to this, since the foamed metal layer is provided between the first reinforcing member and the pipe and between the second reinforcing member and the pipe, the foamed metal layer is compressed and deformed corresponding to the shape of the pipe. Thus, it is possible to suppress the occurrence of a gap between each reinforcing member and the pipe. Therefore, even if there is unevenness in the shape of the pipe and the outer peripheral surface, the pipe can be reinforced by each reinforcing member.

As a desirable aspect of the present invention, an inner diameter of an annular portion formed by the first curved plate portion and the second curved plate portion when the first flange portion and the second flange portion are brought into contact with each other. Includes a step of forming the first reinforcing member and the second reinforcing member so as to be larger than the outer diameter of the pipe. According to this, even if the outer diameter of the pipe is small, the foamed metal layer is provided between the first curved plate portion and the second curved plate portion and the pipe, so the first curved plate portion and the second curved plate portion are provided. It can suppress that a clearance gap arises between a curved board part and piping.

According to the pipe reinforcing structure and the pipe reinforcing method of the present invention, it is possible to reinforce the pipe even when there are variations in the shape of the pipe and unevenness.

FIG. 1 is a front view for explaining a piping reinforcement structure according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II ′ of FIG. FIG. 3 is an enlarged cross-sectional view of the first flange portion and the second flange portion shown in FIG. 4 is a cross-sectional view taken along the line IV-IV 'of FIG. FIG. 5 is an enlarged cross-sectional view of the first curved plate portion and the second curved plate portion shown in FIG. FIG. 6 is a perspective view schematically showing an example of a foam metal layer. FIG. 7 is a front view showing a pipe provided with a welded portion. FIG. 8 is a longitudinal cross-sectional view for explaining a piping reinforcement structure in a welded portion. FIG. 9 is a cross-sectional view of the first reinforcing member and the second reinforcing member for explaining the pipe reinforcing method according to the first embodiment. FIG. 10 is a front view for explaining the step of winding the foam metal layer around the pipe. FIG. 11 is a front view for explaining a first modification of the step of winding the foam metal layer around the pipe. FIG. 12 is a cross-sectional view for explaining a first modification of the step of winding the foam metal layer around the pipe. FIG. 13: is sectional drawing for demonstrating the 2nd modification of the process of winding a metal foam layer around piping. FIG. 14 is a cross-sectional view for explaining a process of attaching the foam metal layer to the first reinforcing member. FIG. 15 is a cross-sectional view for explaining a process of attaching the foam metal layer to the second reinforcing member. FIG. 16 is a schematic diagram for explaining a process of attaching the first reinforcing member and the second reinforcing member to the pipe. FIG. 17 is a front view for explaining a piping reinforcement structure according to the second embodiment. FIG. 18 is a front view showing a pipe according to the second embodiment. FIG. 19 is a front view when a metal foam layer is wound around the pipe according to the second embodiment. FIG. 20 is a front view showing another example when the foam metal layer is wound around the pipe according to the second embodiment.

Hereinafter, embodiments of a pipe reinforcement structure and a pipe reinforcement method according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. Moreover, the method, apparatus, and modification example described in this embodiment can be arbitrarily combined within the scope obvious to those skilled in the art.

(First embodiment)
FIG. 1 is a front view for explaining a piping reinforcement structure according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II ′ of FIG. FIG. 3 is an enlarged cross-sectional view of the first flange portion and the second flange portion shown in FIG. 4 is a cross-sectional view taken along the line IV-IV ′ of FIG. FIG. 5 is an enlarged cross-sectional view of the first curved plate portion and the second curved plate portion shown in FIG.

As shown in FIG. 1, the pipe reinforcement structure 1 of the present embodiment includes a reinforcing tool 20 and a foam metal layer 31 and is attached in a state of surrounding the outer peripheral surface 10 s of the pipe 10. The pipe 10 has a cylindrical shape and is used for flowing power steam through the internal space over a long period of time. The power steam has, for example, a steam temperature of about 300 ° C. or more and 650 ° C. or less, and a steam pressure of about 5 MPa or more and 8 MPa or less. Since the high-temperature and high-pressure power steam flows, the pipe 10 may be deteriorated by creep. For the pipe 10, ferritic chromium steel having a low coefficient of thermal expansion is used. As the ferritic chromium steel, for example, a chromium (Cr) content of about 9 wt% or more and 12 wt% or less is used.

The outer diameter D1 (see FIG. 2) of the pipe 10 varies depending on the application, but is determined within a range of, for example, 100 mm or more and 1000 mm or less. Further, the thickness tx (see FIG. 2) of the pipe 10 is determined in a range of 40 mm or more and 70 mm or less, for example. The outer diameter D1 and the thickness tx of the pipe 10 are determined in consideration of various conditions such as the temperature, pressure, flow rate, and flow velocity of the power steam.

The portion to be reinforced in the present embodiment is a straight pipe portion of the pipe 10 that is substantially linear. A reinforcing tool 20 for reinforcing the strength of the pipe 10 is attached to the straight pipe portion of the pipe 10. The reinforcing tool 20 includes a first reinforcing member 21A and a second reinforcing member 21B. The first reinforcing member 21A and the second reinforcing member 21B have a predetermined length along the axial direction of the pipe 10, and the outer peripheral surface 10s of the pipe 10 is composed of the first reinforcing member 21A and the second reinforcing member 21B. Is placed around.

The first reinforcing member 21A and the second reinforcing member 21B are made of a material having a higher creep strength than the material of the pipe 10 (ferrite chrome steel). For example, stainless steel, nickel alloy, cobalt alloy, or high chromium steel is used for the first reinforcing member 21A and the second reinforcing member 21B. Since the first reinforcing member 21A and the second reinforcing member 21B are made of a material having a creep strength higher than that of the pipe 10, the reinforcing strength of the pipe 10 can be increased.

As shown in FIG. 2, the first reinforcing member 21A includes a first curved plate portion 22A and

first flange portions

23A and 24A. The first curved plate portion 22 A is a plate-like member that curves to face the outer peripheral surface 10 s of the pipe 10. In the present embodiment, the inner peripheral surface of the first curved plate portion 22A is curved with substantially the same curvature as the outer peripheral surface 10s of the pipe 10. The first flange portion 23 A is provided on one end side in the circumferential direction of the first curved plate portion 22 A and protrudes outward in the radial direction of the pipe 10. The first flange portion 24 A is provided on the other end side in the circumferential direction of the first curved plate portion 22 A and protrudes outward in the radial direction of the pipe 10.

The second reinforcing member 21B includes a second curved plate portion 22B and

second flange portions

23B and 24B. The second curved plate portion 22 B is a plate-like member that curves to face the outer peripheral surface 10 s of the pipe 10. In the present embodiment, the inner peripheral surface of the second curved plate portion 22B is curved with substantially the same curvature as the outer peripheral surface 10s of the pipe 10. The second flange portion 23 B is provided on one end side in the circumferential direction of the second curved plate portion 22 B and protrudes outward in the radial direction of the pipe 10. The second flange portion 24B is provided on the other end side in the circumferential direction of the second curved plate portion 22B, and projects outward in the radial direction of the pipe 10.

As shown in FIG. 1, the length of the first curved plate portion 22A and the second curved plate portion 22B in the axial direction of the pipe 10 is longer than the length of the first flange portion 23A and the second flange portion 23B, respectively. It has become. In the first reinforcing member 21A, a portion where the first flange portion 23A is not provided is a first portion 21Aa and a third portion 21Ac, and a portion where the first flange portion 23A is provided is a second portion 21Ab. In the axial direction of the pipe 10, the first reinforcing member 21A is continuously arranged in the order of the first portion 21Aa, the second portion 21Ab, and the third portion 21Ac. Similarly, the second reinforcing member 21B is continuously arranged in the order of the first portion 21Ba, the second portion 21Bb, and the third portion 21Bc in the axial direction of the pipe 10. That is, in FIG.2 and FIG.3, sectional drawing in 2nd part 21Ab of 21 A of 1st reinforcement members and 2nd part 21Bb of 2nd reinforcement member 21B is shown.

2 and 3, the second reinforcing member 21 B is disposed adjacent to the first reinforcing member 21 A in the circumferential direction of the pipe 10. Specifically, the first curved plate portion 22A is disposed on the opposite side of the second curved plate portion 22B with respect to the central axis C of the pipe 10, and the first curved plate portion 22A and the second curved plate portion 22B An outer peripheral surface 10s of the pipe 10 is surrounded. The first flange portion 23A is disposed to face the second flange portion 23B, and the first flange portion 24A is disposed to face the second flange portion 24B.

The opposing first flange portion 23A and second flange portion 23B are fixed by a fixing member 41. The opposing first flange portion 24A and second flange portion 24B are fixed by a fixing member 41. The fixing member 41 is a member for fixing the first flange portion 23A and the second flange portion 23B adjacent in the circumferential direction, and fixing the first flange portion 24A and the second flange portion 24B. 41a and nut 41b.

The foam metal layer 31 is provided between the pipe 10 and the first reinforcing member 21A and between the pipe 10 and the second reinforcing member 21B. As shown in FIG. 2, the foam metal layer 31 is provided on the entire circumference of the pipe 10 in the circumferential direction. Further, as shown in FIG. 1, the foam metal layer 31 is provided so as to extend in a direction along the axial direction of the pipe 10, and is substantially the same length as the lengths of the first reinforcing member 21A and the second reinforcing member 21B. And overlaps with the first reinforcing member 21A and the second reinforcing member 21B.

FIG. 6 is a perspective view schematically showing an example of a foam metal layer. In the foam metal layer 31, a large number of pores 35 are provided in a sheet-like metal layer 34. The metal layer 34 is made of, for example, a material such as stainless steel, iron base material, or nickel base material. The arrangement and size of the pores 35 are randomly formed. The porosity of the foam metal layer 31, that is, the ratio of the volume occupied by the pores 35 in the foam metal layer 31 having a predetermined volume is, for example, 10% or more and 90% or less. The average diameter of the pores 35 is not less than 1 μm and not more than 1000 μm. The thickness of one layer of the metal foam layer 31 is, for example, 1 mm or more and 100 mm or less. However, as will be described later, the thickness of the foamed metal layer 31 disposed on the outer peripheral surface 10 s of the pipe 10 can be appropriately changed by providing a plurality of sheet-like foamed metal layers 31 in an overlapping manner.

Since the foam metal layer 31 includes a large number of pores 35, when the stress is applied from the outside, the pores 35 are crushed and can be easily compressed and deformed. In the present embodiment, when the first reinforcing member 21 A and the second reinforcing member 21 B are fixed to each other around the pipe 10, the foam metal layer 31 is formed in the radial direction of the pipe 10, that is, the thickness of the foam metal layer 31. It can be compressed and deformed in the vertical direction.

As shown in FIG. 3, the plate thickness ta of the first curved plate portion 22A and the second curved plate portion 22B is thinner than the thickness tx of the pipe 10. For example, when the pipe 10 is made of 9 chrome steel having a thickness tx of 40 mm, and the first reinforcing member 21A and the second reinforcing member 21B are made of austenitic stainless steel (for example, SUS304), The plate thickness ta of the first curved plate portion 22A and the second curved plate portion 22B is determined in the range of 5 mm or more and 15 mm or less. That is, the plate thickness ta of the first curved plate portion 22A and the second curved plate portion 22B is set to about 1/8 or more and 3/8 or less of the thickness tx of the pipe 10.

The same material as the first curved plate portion 22A is used for the

first flange portions

23A and 24A, and is provided integrally with the first curved plate portion 22A. The

second flange portions

23B and 24B are made of the same material as the second curved plate portion 22B, and are provided integrally with the second curved plate portion 22B. In FIG. 3, the first flange portion 23A and the second flange portion 23B are shown, and the first flange portion 24A and the second flange portion 24B are omitted. The first flange portion 24A and the second flange portion 24B have the same configuration as the first flange portion 23A and the second flange portion 23B.

As shown in FIG. 3, the first flange portion 23A and the second flange portion 23B are plate-like members protruding in the radial direction of the pipe 10, and the plate thickness tb of the first flange portion 23A and the second flange portion 23B. Are thicker than the plate thickness ta of the first curved plate portion 22A and the second curved plate portion 22B, respectively. Thereby, the strength of the first flange portion 23A and the second flange portion 23B is enhanced, and when the fastening force is applied by the fixing member 41, the deformation of the first flange portion 23A and the second flange portion 23B is suppressed. . When the first flange portion 23A and the second flange portion 23B move toward each other by the fastening force of the fixing member 41, the first curved plate portion 22A is interlocked with the first flange portion 23A and the second flange portion 23B. And the second curved plate portion 22B move in a direction approaching each other in the circumferential direction. The plate thickness tb of the first flange portion 23A and the second flange portion 23B is twice the plate thickness ta of the first curved plate portion 22A and the second curved plate portion 22B, respectively, but is limited to this ratio. For example, the ratio can be set to be larger than 2 times and 3 times or less.

As shown in FIG. 3, the first flange portion 23A and the second flange portion 23B are provided with

thick portions

25A and 25B at the connection portions between the first curved plate portion 22A and the second curved plate portion 22B. Yes. That is, the thickness in the circumferential direction of the pipe 10 of the first flange portion 23A and the second flange portion 23B is the connecting portion between the first curved plate portion 22A and the second curved plate portion 22B on the inner side in the radial direction. It is thicker than the radially outer part. Thereby, the stress concentration in the connection portion between the first flange portion 23A and the first curved plate portion 22A and the connection portion between the second flange portion 23B and the second curved plate portion 22B is suppressed, and the first flange portion 23A. And the intensity | strength of the 2nd flange part 23B can be raised. The

thick portions

25A and 25B may be manufactured integrally with the first flange portion 23A and the second flange portion 23B, respectively. For example, the connection portion may be provided by welding a metal having a triangular cross section.

As shown in FIG. 3, the first flange portion 23A is provided with a through hole 23Aa that penetrates in the plate thickness direction. Further, the second flange portion 23B is provided with a through hole 23Ba penetrating in the thickness direction. When fixing the first reinforcing member 21A and the second reinforcing member 21B, the through hole 23Aa is disposed substantially concentrically with respect to the through hole 23Ba. The bolt 41a of the fixing member 41 passes through the through hole 23Aa and the through hole 23Ba, and the first flange portion 23A and the second flange portion 23B are fixed by the bolt 41a and the nut 41b. Note that the first flange portion 24A and the second flange portion 24B (not shown in FIG. 3) are similarly provided with through holes, and the first flange portion 24A and the second flange portion 24B are fixed by the fixing member 41. The

In the example shown in FIG. 1, the first flange portion 23 A and the second flange portion 23 B are fixed by eight fixing members 41. That is, the through holes 23Aa and the through holes 23Ba are also provided in the first flange portion 23A and the second flange portion 23B, respectively, along the axial direction of the pipe 10. In addition, the fixing location of 23 A of 1st flange parts and the 2nd flange part 23B may be 9 or more places, and may be 7 or less places.

Here, as shown in FIG. 3, when the first curved plate portion 22A of the first reinforcing member 21A and the second curved plate portion 22B of the second reinforcing member 21B are fixed so as to surround the pipe 10, the circumferential direction A predetermined gap SP is provided between the first flange portion 23A and the second flange portion 23B adjacent to each other. That is, by fixing the first flange portion 23A and the second flange portion 23B close to each other with the fixing member 41, the first curved plate portion 22A and the second curved plate portion 22B are moved in the circumferential direction by the gap SP. Pulled in the direction of approach. As a result, the inner diameter D2 (see FIG. 2) of the annular portion 22 formed by the first curved plate portion 22A and the second curved plate portion 22B is reduced, and the foam metal layer 31 is compressed and deformed in the radial direction. No. 10 is subjected to a stress that is tightened inward in the radial direction. Thereby, the expansion | swelling of the piping 10 can be countered and the intensity | strength of the piping 10 is reinforced.

In the present embodiment, the foam metal layer 31 is provided so as to surround the outer peripheral surface 10 s of the pipe 10, so that the outer diameter D 1 (see FIG. 2) of the pipe 10 due to manufacturing variations of the pipe 10 is the annular portion 22. Even if it is smaller than the inner diameter D2, the gaps between the pipe 10 and the first curved plate portion 22A and between the pipe 10 and the second curved plate portion 22B can be suppressed. For this reason, when the first flange portion 23A and the second flange portion 23B are fixed close to each other in the circumferential direction, the stress tightened toward the inner side in the radial direction with respect to the pipe 10 via the foam metal layer 31 is increased. In addition, the strength of the pipe 10 can be reinforced. Therefore, according to the piping reinforcement structure 1 of the present embodiment, even if there is a shape variation for each pipe 10, the first reinforcing member 21 A and the second reinforcing member 21 B are arranged according to the shape of each pipe 10. There is no need to manufacture the pipe 10, and the pipe 10 can be easily reinforced by adjusting the thickness of the foam metal layer 31.

Further, since the foam metal layer 31 is provided on the entire circumference in the circumferential direction of the pipe 10, the concentration of stress caused by minute deformation or eccentricity of the cross-sectional shape of the pipe 10 is suppressed, and the circumferential direction of the pipe 10. Reinforcement can be performed all around.

In the example shown in FIG. 3, the foam metal layer 31 is laminated in three layers, but the present invention is not limited to this. For example, the metal foam layer 31 may be one layer or two layers, or four or more layers may be laminated. Even when there is a variation in the outer diameter D1 for each pipe 10, the number of the metal foam layers 31 can be easily changed as appropriate. The thickness tc of the foam metal layer 31 can be set based on the difference between the outer diameter D1 of the pipe 10 and the inner diameter D2 of the annular portion 22, and should be a thickness satisfying tc> (D2-D1) / 2. Can do.

As described above, the lengths of the first curved plate portion 22A and the second curved plate portion 22B in the axial direction of the pipe 10 are longer than the lengths of the first flange portion 23A and the second flange portion 23B, respectively. Yes. As shown in FIGS. 4 and 5, the first flange portion 23A and the second flange portion 23B are not provided in the third portion 21Ac of the first reinforcing member 21A and the third portion 21Bc of the second reinforcing member 21B.

As shown in FIG. 4, the first curved plate portion 22A and the second curved plate portion 22B surround the outer peripheral surface 10s of the pipe 10 in an annular shape. Even in the third portion 21Ac and the third portion 21Bc where the first flange portion 23A and the second flange portion 23B are not provided, between the first curved plate portion 22A and the pipe 10 and between the second curved plate portion 22B and the pipe 10. A foam metal layer 31 is provided therebetween.

As shown in FIG. 5, the circumferential end of the first curved plate portion 22A and the circumferential end of the second curved plate portion 22B are opposed to each other with a gap SP. The clearance SP between the first curved plate portion 22A and the second curved plate portion 22B is the same size as the clearance SP between the first flange portion 23A and the second flange portion 23B shown in FIG.

Also in the third portion 21Ac of the first reinforcing member 21A and the third portion 21Bc of the second reinforcing member 21B shown in FIG. 1, the fixing member 41 fixes the first flange portion 23A and the second flange portion 23B close to each other. Thus, the first curved plate portion 22A and the second curved plate portion 22B move in the direction approaching the circumferential direction by the gap SP. As a result, the inner diameter D2 (see FIG. 2) of the annular portion 22 formed by the first curved plate portion 22A and the second curved plate portion 22B is reduced, and the foam metal layer 31 is compressed and deformed in the radial direction. No. 10 is subjected to a stress that is tightened inward in the radial direction. Thereby, the strength of the pipe 10 is reinforced also in the third portion 21Ac and the third portion 21Bc in which the first flange portion 23A and the second flange portion 23B are not provided.

As shown in FIG. 5, the foamed metal layer 31 has a thickness tc even in a portion where the first flange portion 23A and the second flange portion 23B are not provided, and the foamed metal layer 31 is compressed and deformed in the radial direction. To do. For this reason, the difference of the stress applied to the piping 10 can be suppressed between the portion where the first flange portion 23A and the second flange portion 23B are provided and the portion where the first flange portion 23B is not provided. As a result, the strength of the pipe 10 can be increased efficiently.

In addition, also in 1st part 21Aa of 1st reinforcement member 21A shown in FIG. 1, and 1st part 21Ba of 2nd reinforcement member 21B, the 1st flange part 23A and 2nd flange part 23B are made to adjoin by the fixing member 41. FIG. By fixing, the first curved plate portion 22A and the second curved plate portion 22B are pulled in the direction approaching the circumferential direction by the gap SP. Thereby, also in the part in which 23 A of 1st flange parts and the 2nd flange part 23B are not provided, the stress which clamps the piping 10 toward radial inside is added, and the intensity | strength of the piping 10 is reinforced.

As described above, in the present embodiment, the first reinforcing member 21A and the second reinforcing member 21B extend in the direction along the axial direction of the pipe 10, and the foam metal layer 31 includes the first reinforcing member 21A and the second reinforcing member 21B. 2 It overlaps with the reinforcing member 21 B and is provided in a direction along the axial direction of the pipe 10. Thereby, in the direction along the axial direction of the piping 10, it can suppress that a clearance gap produces between the 1st reinforcement member 21A and the piping 10, and between the 2nd reinforcement member 21B and the piping 10, and is effective. The piping 10 can be reinforced.

Moreover, the length in the axial direction of the pipe 10 of the first curved plate portion 22A and the second curved plate portion 22B is larger than the length of the first flange portion 23A and the second flange portion 23B in the axial direction of the pipe 10, respectively. It is getting longer. Accordingly, the first portion 21Aa, the third portion 21Ac, and the first portion 21Ba and the third portion 21Bc of the first reinforcing member 21A, in which the first flange portion 23A and the second flange portion 23B are not provided. Also, the tightening stress is applied to the pipe 10, and the strength of the pipe 10 can be increased efficiently along the axial direction of the pipe 10.

The length of the first reinforcing member 21A and the second reinforcing member 21B in the axial direction of the pipe 10 can be changed as appropriate, but is preferably, for example, three times or more the outer diameter D1 of the pipe 10. If it carries out like this, the stress applied to the piping 10 when the 1st reinforcement member 21A and the 2nd reinforcement member 21B are fixed will be disperse | distributed along an axial direction, and generation | occurrence | production of the stress concentration of the piping 10 can be suppressed.

FIG. 7 is a front view showing a pipe provided with a welded portion. FIG. 8 is a longitudinal cross-sectional view for explaining a piping reinforcement structure in a welded portion. As shown in FIG. 7, the pipe 10 has a plurality of pipe members 10 a formed to have a predetermined length, and the pipe members 10 a and the pipe members 10 a are in a state in which ends of each other are abutted in the longitudinal direction. It is welded with. A welded portion 11 is formed along the circumferential direction at a connection portion between the piping member 10a and the piping member 10a. Although two pipe members 10a are shown in FIG. 7, the straight pipe portion of the pipe 10 has a length of several hundred meters with a plurality of pipe members 10a connected by welding.

As shown in FIG. 8, the welded portion 11 protrudes from the outer peripheral surface 10 s of the pipe 10 toward the outside in the radial direction. Here, the height of the welded portion 11 in the direction from the outer peripheral surface 10s of the pipe 10 toward the outside in the radial direction is defined as a height h1. In addition, although the case where the welding part 11 protrudes from the outer peripheral surface 10s is shown in this embodiment, a recessed part may be formed in the vicinity of the welding part 11.

Since the pipe 10, the first reinforcing member 21 A, and the second reinforcing member 21 B (illustrated in FIG. 8) are all made of a rigid material, it is assumed that the pipe 10 directly does not go through the foam metal layer 31. When the first reinforcing member 21 A and the second reinforcing member 21 B are provided on the outer peripheral surface 10 s, a gap is generated due to the unevenness of the welded portion 11. When the tightening stress of the first reinforcing member 21A and the second reinforcing member 21B is concentrated and applied to the welded portion 11, and there is a gap in the pipe 10 near the welded portion 11, so that sufficient tightening stress is not applied. There is.

In the present embodiment, the foam metal layer 31 is provided on the entire circumference in the circumferential direction of the pipe 10 as described above, and in the direction along the axial direction of the pipe 10, the first reinforcing member 21A and the second reinforcing member. 21B (not shown in FIG. 8). That is, the foam metal layer 31 is provided on the outer peripheral surface 10 s of the pipe 10 so as to cover the welded portion 11.

The thickness tc of the foam metal layer 31 is provided to be thicker than at least the height h1 of the welded portion 11. Here, the thickness tc of the metal foam layer 31 is the thickness of the portion where the welded portion 11 is not provided, and is the radial distance between the outer peripheral surface 10s of the pipe 10 and the first curved plate portion 22A. is there. The metal foam layer 31 is more compressively deformed in the portion where the welded portion 11 is provided than in the portion where the welded portion 11 is not provided. Thereby, the foam metal layer 31 contacts the outer peripheral surface 10s in the vicinity of the welded portion 11 and the welded portion 11, and between the outer peripheral surface 10s of the pipe 10 caused by the unevenness of the welded portion 11 and the first curved plate portion 22A. The generation of the gap can be suppressed.

When the first reinforcing member 21A and the second reinforcing member 21B (not shown in FIG. 8) are subjected to stress tightening toward the inside in the radial direction of the pipe 10, a portion where the welded portion 11 is provided; Stress is applied via the foam metal layer 31 to a portion in the vicinity of the weld 11 where the weld 11 is not provided. For this reason, the stress concentration in the welded portion 11 is suppressed, and the strength of the pipe 10 is reinforced in the direction along the axial direction of the pipe 10.

As shown in FIG. 8, a plurality of foam metal layers 31 are provided on the outer peripheral surface 10 s of the pipe 10, so that the thickness of one layer of the foam metal layer 31 is thinner than the height h 1 of the welded part 11. Even if it exists, according to the height h1 of the welding part 11, it is easy to change the number of layers of the metal foam layer 31 suitably. Therefore, the overall thickness tc of the foam metal layer 31 can be made thicker than the height h1 of the welded portion 11, and the strength of the pipe 10 can be reliably reinforced.

(Pipe reinforcement method)
Next, a method for reinforcing the pipe 10 according to the first embodiment will be described. FIG. 9 is a cross-sectional view of the first reinforcing member and the second reinforcing member for explaining the pipe reinforcing method according to the first embodiment. In the present embodiment, the reinforcing tool 20 for the pipe 10 can be produced based on the design dimensions of the pipe 10. Specifically, the first reinforcing member 21A and the second reinforcing member 21B are manufactured so that the inner diameter D3 of the annular portion 22 is larger than the design dimension of the outer diameter D1 (see FIG. 2) of the pipe 10. Here, the inner diameter D3 of the annular portion 22 is such that the first flange portion 23A and the second flange portion 23B are brought into contact with each other, and the first flange portion 24A and the second flange portion 24B are brought into contact with each other. An inner diameter of an annular cross-sectional shape formed by the first curved plate portion 22A and the second curved plate portion 22B is shown.

As described above, in the present embodiment, the foam metal layer 31 is provided between the pipe 10 and the first reinforcing member 21A and between the pipe 10 and the second reinforcing member 21B. Even when the inner diameter D3 is larger than the outer diameter D1 of the pipe 10, the gap between the first reinforcing member 21A and the pipe 10 and the gap between the second reinforcing member 21B and the pipe 10 are generated. Can be suppressed. Moreover, since the foam metal layer 31 is provided, it is not necessary to measure the actual dimension of the pipe 10 and produce the first reinforcing member 21A and the second reinforcing member 21B according to the shape of each pipe 10. For this reason, the first reinforcing member 21 A and the second reinforcing member 21 B can be manufactured based on the design dimensions of the pipe 10, and the manufacturing cost of the reinforcing tool 20 can be reduced.

FIG. 10 is a front view for explaining the step of winding the foam metal layer around the pipe. In the process shown in FIG. 10, the metal foam layer 31 is wound around the outer periphery of the pipe 10. At this time, the actual shape of the pipe 10 can be measured to fill the difference between the measured outer diameter D1 of the pipe 10 (see FIG. 2) and the design dimension of the inner diameter D3 of the annular portion 22 (see FIG. 9). Thus, the thickness td of the foam metal layer 31 is determined. The thickness td of the state in which the foamed metal layer 31 is wound around the pipe 10 is the thickness tc of the foamed metal layer 31 when the first reinforcing member 21A and the second reinforcing member 21B are fixed as shown in FIG. It is thicker than. The thickness td in a state where the foam metal layer 31 is wound can be appropriately changed according to the size of the outer diameter D1 of the pipe 10, the magnitude of the fastening stress, the porosity of the foam metal layer 31, and the like.

In the example shown in FIG. 10, a long sheet-like material is used as the foam metal layer 31, and the foam metal layer 31 is spirally wound around the outer peripheral surface 10 s of the pipe 10 along the axial direction of the pipe 10. . By doing so, the foamed metal layer 31 can be easily provided along the axial direction in the portion of the pipe 10 overlapping the first reinforcing member 21A and the second reinforcing member 21B. Further, a plurality of spiral foam metal layers 31 may be stacked and wound around the pipe 10.

Further, as shown in FIG. 10, it is preferable to wind the metal foam layer 31 so that the ends of the pipe 10 in the axial direction overlap each other. The overlapping portion 31 a where the ends of the metal foam layer 31 overlap is provided in a spiral shape along the axial direction of the pipe 10. By carrying out like this, it can suppress that a clearance gap produces between metal foam metal layers 31, and can suppress generation | occurrence | production of the clearance gap between the 1st reinforcement member 21A and 2nd reinforcement member 21B, and the piping 10. FIG. .

The method for winding the foam metal layer 31 is not particularly limited. FIG. 11 is a front view for explaining a first modification of the step of winding the foam metal layer around the pipe. FIG. 12 is a cross-sectional view for explaining a first modification of the step of winding the foam metal layer around the pipe. FIG. 13: is sectional drawing for demonstrating the 2nd modification of the process of winding a metal foam layer around piping.

As shown in FIG. 11, in this modification, a plurality of foam metal layers 31 are arranged along the axial direction of the pipe 10. The foam metal layer 31 is wound around the circumferential direction of the pipe 10. In the example shown in FIG. 11, six foam metal layers 31 are arranged adjacent to each other in the axial direction of the pipe 10, but the width of the foam metal layer 31 and the foam metal layer arranged in the axial direction of the pipe 10. The number of 31 may be changed as appropriate. Moreover, you may arrange the some metal foam layer 31 so that the edge parts of the width direction may mutually overlap.

As shown in FIG. 12, each of the foam metal layers 31 has a length corresponding to one circumference of the outer circumference of the pipe 10, and is wound around the circumference of the pipe 10 for each circumference. A plurality of the metal foam layers 31 are stacked in the radial direction of the pipe 10. The present invention is not limited to this, and a plurality of foam metal layers 31 may be wound continuously using a long metal foam layer 31 as shown in FIG.

11 to 13 has an advantage that the thickness and the number of layers of the foam metal layer 31 can be changed for each block along the axial direction of the pipe 10. For example, the thickness of the foam metal layer 31 can be reduced at the location where the weld 11 described above is provided, and the thickness of the foam metal layer 31 can be increased at the location where the weld 11 is not provided. Thus, it is easy to adjust the thickness of the foam metal layer 31 corresponding to the actual dimension of the pipe 10, and the concentration of stress in the pipe 10 can be reliably suppressed.

In the example shown in FIGS. 10 to 13, the example in which the foamed metal layer 31 is wound around the pipe 10 is shown, but the present invention is not limited to this. FIG. 14 is a cross-sectional view for explaining a process of attaching the foam metal layer to the first reinforcing member. FIG. 15 is a cross-sectional view for explaining a process of attaching the foam metal layer to the second reinforcing member. As shown in FIGS. 14 and 15, the metal foam layers 31 A and 31 B may be provided on the first reinforcing member 21 A and the second reinforcing member 21 B, respectively.

As shown in FIG. 14, the foam metal layer 31A is attached to the first curved plate portion 22A of the first reinforcing member 21A. The foam metal layer 31A is attached from the position overlapping the first flange portion 23A to the position overlapping the first flange portion 24A along the inner peripheral surface 22Aa of the first curved plate portion 22A. In FIG. 14, a plurality of the metal foam layers 31A are laminated, and the metal foam layers 31A and the first curved plate portion 22A and the metal foam layers 31A are bonded to each other through adhesive layers (not shown). The

Further, as shown in FIG. 15, the foam metal layer 31B is attached to the second curved plate portion 22B of the second reinforcing member 21B. The foam metal layer 31B is attached along the inner peripheral surface 22Ba of the second curved plate portion 22B from a position overlapping the second flange portion 23B to a position overlapping the second flange portion 24B. In FIG. 15, a plurality of foam metal layers 31B are laminated so as to have the same thickness as the total thickness of the foam metal layers 31A shown in FIG. The foam metal layer 31B, the second curved plate portion 22B, and the foam metal layers 31B of the respective layers are bonded together via an adhesive layer (not shown).

As shown in FIGS. 14 and 15, in the method of attaching the foam metal layers 31 A and 31 B to the first reinforcement member 21 A and the second reinforcement member 21 B, the place where the work of attaching the foam metal layers 31 A and 31 B is performed is piping. Therefore, even if a sufficient space cannot be secured around the pipe 10, the

metal foam layers

31A and 31B can be easily attached. Further, the foam metal layer 31A and the foam metal layer 31B may be provided to have different thicknesses. Thereby, even if it is a case where distortion, such as eccentricity, has generate | occur | produced in the cross-sectional shape of the piping 10, it can reinforce favorably in the circumferential direction of the piping 10.

FIG. 16 is a schematic diagram for explaining a process of attaching the first reinforcing member and the second reinforcing member to the pipe. As shown in FIG. 16, the pipe 10 is supported by

pipe support portions

101 and 102. As described above, after the metal foam layer 31 is wound around the pipe 10, or the

metal foam layers

31A and 31B are attached to the first reinforcing member 21A and the second reinforcing member 21B, respectively. Thereafter, the first reinforcing member 21A and the second reinforcing member 21B are disposed so as to surround the pipe 10, and the first reinforcing member 21A and the second reinforcing member 21B are temporarily fixed by the reinforcing

tool support portions

103 and 104. . At this time, the first reinforcing member 21A and the second reinforcing member 21B are arranged such that the first flange portion 23A and the second flange portion 23B face each other and the through hole 23Aa and the through hole 23Ba (see FIG. 3) are continuous. Fine-tune the position of.

Then, by tightening the fixing member 41 with a predetermined torque, the first reinforcing member 21A and the second reinforcing member 21B are radially connected to the pipe 10 via the foam metal layer 31 (not shown in FIG. 16). Tightening stress is applied. The strength of the pipe 10 is reinforced by the above reinforcing method. Note that the method of attaching the first reinforcing member 21A and the second reinforcing member 21B shown in FIG. 16 is merely an example, and the configurations of the

pipe support portions

101 and 102, the reinforcing

tool support portions

103 and 104, and the like are appropriately changed. May be.

(Second Embodiment)
FIG. 17 is a front view for explaining a piping reinforcement structure according to the second embodiment. FIG. 18 is a front view showing a pipe according to the second embodiment. As shown in FIG.17 and FIG.18, the piping 12 of this embodiment has the curved part 12a, the straight pipe part 12b, and the straight pipe part 12c. The straight pipe portion 12b is a pipe extending linearly in the horizontal direction. The straight pipe portion 12c is a pipe extending linearly in a direction orthogonal to the extending direction of the straight pipe portion 12b. The bending portion 12a is bent to approximately 90 ° (L-shaped) and connects the straight pipe portion 12b and the straight pipe portion 12c. The portion to be reinforced in the piping reinforcing structure 1A of the present embodiment is a curved portion 12a of the piping 12, a so-called elbow portion. The bending portion 12a is not limited to a configuration that bends to approximately 90 ° (L-shaped), and may be, for example, to be bent to approximately 45 °, or may be configured to bend to approximately 180 ° (U-shaped). It may be.

As shown in FIG. 18, in the pipe 12, a welded portion 11 A is formed along the circumferential direction at a connection portion between the curved portion 12 a and the straight pipe portion 12 b. Further, a welded portion 11B is formed along the circumferential direction at the connection portion between the curved portion 12a and the straight tube portion 12c. Furthermore, a welded portion 11C is provided along the inner curved portion of the curved portion 12a. In the pipe 12, irregularities are provided in the vicinity of these

welds

11A, 11B, and 11C.

As shown in FIG. 17, reinforcing

tools

20A, 20B, 20C, 20D, and 20E are attached to the curved portion 12a of the pipe 12. The reinforcing

tools

20A, 20B, 20C, 20D, and 20E are arranged side by side in a direction along the axial direction of the bending portion 12a. Reinforcing

tools

20A, 20B, 20C, 20D, and 20E each include a first reinforcing member 21C and a second reinforcing member 21D. The first reinforcing member 21C and the second reinforcing member 21D have a predetermined length along the axial direction of the pipe 12, and the outer peripheral surface of the curved portion 12a is composed of the first reinforcing member 21C and the second reinforcing member 21D. 12as are disposed around.

Since the reinforcing

tools

20A, 20B, 20C, 20D, and 20E are disposed in the bending portion 12a, the reinforcing

tools

20A, 20B, 20C, 20D, and 20E are long in a portion corresponding to the outer bending portion of the bending portion 12a and a portion corresponding to the inner bending portion of the bending portion 12a. Are different. That is, in the axial direction of the curved portion 12a, the length L1 of the portion of the second reinforcing member 21D that faces the inner curved portion of the curved portion 12a is opposed to the outer curved portion of the curved portion 12a of the first reinforcing member 21C. It is shorter than the length L2 of the part to be performed.

As in the first embodiment, the first reinforcing member 21C includes a first curved plate portion 22C and a first flange portion 23C. The second reinforcing member 21D includes a second curved plate portion 22D and a second flange portion 23D. In addition, although illustration is abbreviate | omitted in FIG. 17, the 1st flange part similar to the 1st flange part 23C is provided in the edge part on the opposite side with respect to the 1st flange part 23C of the 1st curved board part 22C. . Moreover, the 2nd flange part similar to 2nd flange part 23D is provided in the edge part on the opposite side with respect to 2nd flange part 23D of 2nd curved board part 22D.

In the present embodiment, the metal foam layer 32 is provided between the first reinforcing member 21C and the curved portion 12a and between the second reinforcing member 21D and the curved portion 12a. By fastening and fixing the first flange portion 23C and the second flange portion 23D with the fixing member 41, the first curved plate portion 22C and the second curved plate portion 22D are pulled in a direction approaching each other in the circumferential direction. Thereby, from the first reinforcing member 21C and the second reinforcing member 21D, a tightening stress toward the inside in the radial direction is applied to the bending portion 12a, and the strength of the bending portion 12a is reinforced.

Also in the present embodiment, the metal foam layer 32 is compressed and deformed in the radial direction of the curved portion 12a by the tightening stress applied from the first reinforcing member 21C and the second reinforcing member 21D. Thereby, it can suppress that a gap | interval generate | occur | produces between 21 C of 1st reinforcement members and the curved part 12a, and between 2nd reinforcement member 21D and the curved part 12a, and can suppress the concentration of stress. The curved portion 12a is a portion where an actual dimensional error of an outer diameter shape or a curved shape is likely to occur with respect to a design dimension. However, by providing the foamed metal layer 32, generation of a gap due to the dimensional error can be suppressed. .

FIG. 19 is a front view when a metal foam layer is wound around the pipe according to the second embodiment. FIG. 20 is a front view showing another example when the foam metal layer is wound around the pipe according to the second embodiment. In the present embodiment, as shown in FIG. 19, a long sheet-like material is used as the foam metal layer 32, and the foam metal layer 32 has an outer peripheral surface of the curved portion 12 a along the axial direction of the curved portion 12 a. It is wound around 12as in a spiral. Thereby, even if it is the curved part of the curved part 12a, the metal foam layer 32 can be wound easily. A plurality of the metal foam layers 32 may be laminated as described above.

At this time, the foam metal layer 32 is provided so as to cover the welded

portions

11A, 11B, and 11C. Thereby, since the foam metal layer 32 is compressed and deformed corresponding to the unevenness generated in the vicinity of the welded

portions

11A, 11B, and 11C, the stress concentration in the welded

portions

11A, 11B, and 11C is suppressed, and the strength of the curved portion 12a is suppressed. Can be reinforced.

The winding method of the foam metal layer 32 shown in FIG. 19 is merely an example, and other methods may be used. For example, as shown in FIG. 20, the

metal foam layers

32A, 32B, 32C, 32D, and 32E may be arranged along the axial direction of the curved portion 12a. The

foam metal layers

32A, 32B, 32C, 32D, and 32E are provided at positions that respectively overlap the reinforcing

tools

20A, 20B, 20C, 20D, and 20E (see FIG. 17).

In the example shown in FIG. 20, since the shape, thickness, etc. can be changed for each of the

foam metal layers

32A, 32B, 32C, 32D, 32E, for example, the

foam metal layers

32A, 32E overlapping the

welds

11A, 11B. Can be appropriately adjusted, for example, to have a thickness different from those of other portions. Similarly to the example shown in FIGS. 14 and 15, the foam metal layer 32 may be attached to the first reinforcing member 21 C and the second reinforcing member 21 D.

As mentioned above, although embodiment of this invention was described, this invention is not limited by the content of this embodiment, It can change suitably. For example, the first reinforcing member 21A and the second reinforcing member 21B shown in the first embodiment have a frontal shape and a cross-sectional shape that are line-symmetric with each other, but may be asymmetrical with each other. The

first flange portion

23A, 24A and the

second flange portion

23B, 24B are provided in two each, but the first flange portion 23A is provided on one end side of the first curved plate portion 22A, and the second curved portion is provided. A second flange portion 23B is provided on one end side of the plate portion 22B, and the other end side of the first curved plate portion 22A and the other end side of the second curved plate portion 22B are fixed to be operable by a hinge structure, for example. May be.

1, 1A Piping

reinforcement structure

10, 12 Piping 10a Piping member 10s, 12as Outer

peripheral surface

11, 11A, 11B, 11C Welding portion

12a Bending portion

12b, 12c

Straight pipe portion

20, 20A, 20B, 20C, 20D,

20E Reinforcing tool

21A, 21C

1st reinforcement member

21B, 21D 2nd reinforcement member 22

Annular part

22A, 22C 1st curved

plate part

22B, 22D 2nd curved plate part 22Aa, 22Ba Inner

peripheral surface

23A, 23C, 24A

1st flange part

23B, 23D, 24B Second flange portion 23Aa, 23Ba Through

hole

25A,

25B Thick portion

31, 31A, 31B, 32, 32A, 32B, 32C, 32D, 32E Foamed metal layer 35 Pore 41 Fixing member D1 Outer diameter D2, D3 Inner diameter

Claims

It is a reinforcing structure that reinforces piping for flowing high-temperature and high-pressure steam,
The 1st curved board part which curves facing the outer peripheral surface of the said piping, and the 1st flange part which protrudes in the radial direction outer side of the said piping from the edge part of the circumferential direction of the said 1st curved board part A reinforcing member;
A second curved plate portion that is curved to face the outer peripheral surface of the pipe and is disposed adjacent to the first curved plate portion in the circumferential direction of the pipe, and a circumferential end portion of the second curved plate portion A second reinforcing member that protrudes outward in the radial direction of the pipe and has a second flange portion facing the first flange portion;
A fixing member for fixing the first flange portion and the second flange portion facing each other when the first reinforcing member and the second reinforcing member are disposed on the outer peripheral surface of the pipe;
Provided between the first reinforcing member and the pipe and between the second reinforcing member and the pipe, and when the first flange portion and the second flange portion are fixed to each other, A reinforcing structure for piping having a foamed metal layer compressively deformed in a radial direction.
2. The piping reinforcing structure according to claim 1, wherein the metal foam layer is provided on the entire circumference of the piping in the circumferential direction.
The first reinforcing member and the second reinforcing member extend in a direction along the axial direction of the pipe,
The piping reinforcing structure according to claim 1 or 2, wherein the metal foam layer is provided in a direction along an axial direction of the piping so as to overlap the first reinforcing member and the second reinforcing member.
The piping reinforcing structure according to any one of claims 1 to 3, wherein the metal foam layer is provided so as to cover a welded portion protruding radially outward from an outer peripheral surface of the pipe.
5. The piping reinforcing structure according to claim 1, wherein a plurality of the metal foam layers are provided on the outer peripheral surface of the piping.
The piping reinforcing structure according to any one of claims 1 to 5, wherein the metal foam layer is spirally wound around an outer peripheral surface of the pipe along the axial direction of the pipe.
The inner diameter of the annular portion formed by the first curved plate portion and the second curved plate portion when the first flange portion and the second flange portion are brought into contact with each other is larger than the outer diameter of the pipe. The piping reinforcing structure according to any one of claims 1 to 6, which is large.
The length of the first curved plate portion and the second curved plate portion in the axial direction of the pipe is longer than the length of the first flange portion and the second flange portion in the axial direction of the pipe, respectively. The piping reinforcing structure according to any one of claims 1 to 7.
The pipe according to any one of claims 1 to 8, wherein lengths of the first reinforcing member and the second reinforcing member in the axial direction of the pipe are three times or more of an outer diameter of the pipe. Reinforcement structure.
The thicknesses of the first flange portion and the second flange portion in the circumferential direction of the pipe are the radially outer portions at the connection points with the first curved plate portion and the second curved plate portion, respectively. The reinforcing structure for piping according to any one of claims 1 to 9, wherein the reinforcing structure is thicker.
A reinforcing method for reinforcing piping for flowing high-temperature and high-pressure steam,
A step of winding a foam metal sheet around the outer peripheral surface of the pipe;
The 1st curved board part which curves facing the outer peripheral surface of the said piping, and the 1st flange part which protrudes in the radial direction outer side of the said piping from the edge part of the circumferential direction of the said 1st curved board part A reinforcing member, a second curved plate portion that curves to face the outer peripheral surface of the pipe, and a second flange portion that projects outward in the radial direction of the pipe from the circumferential end of the second curved plate portion. A first reinforcing member and a second reinforcing member, wherein the first reinforcing member and the second reinforcing member are disposed so as to surround an outer peripheral surface of the pipe, and are opposed to each other. A step of compressing and deforming the foamed metal sheet in the radial direction of the pipe.
When the first flange portion and the second flange portion are brought into contact with each other, an inner diameter of an annular portion formed by the first curved plate portion and the second curved plate portion is an outer diameter of the pipe. The method of reinforcing a pipe according to claim 11, comprising a step of forming the first reinforcing member and the second reinforcing member so as to be larger than the first reinforcing member.