JP5886263B2 - Reinforcing equipment for piping - Google Patents

Description

  The present invention relates to a reinforcing tool for piping that reinforces metallic piping.

  As a metal pipe, for example, a steam pipe that is used as power for a steam turbine or the like and flows high-temperature high-pressure power steam having a steam temperature of 300 ° C. to 650 ° C. and a steam pressure of about 5 Mpa to 8 Mpa is known. . Such steam pipes flow power steam at high temperature and pressure, and therefore deteriorate due to creep.

  In order to prevent the steam pipe from being destroyed due to creep deterioration, the steam pipe is reinforced. Usually, the method of cut | disconnecting the target part of steam piping and joining healthy piping to a cutting location is taken. However, this method involves a problem that work is troublesome because it involves fusing / welding work and heat treatment work of the steam pipe. Thus, for example, it is known to reinforce the steam pipe by winding a wire around the target part of the steam pipe (see, for example, Patent Document 1).

JP 2011-185403 A

  In the method of reinforcing the steam pipe by winding the wire as described above, when winding the wire around the reinforcement target part in the steam pipe without cutting the steam pipe, the beam or steam pipe of the building The fixed metal fitting etc. which are fixing can become an obstacle at the time of winding a wire. In particular, when the wire is wound by a machine, it may be difficult to secure a sufficient space around the steam pipe.

  For this reason, when sufficient space for machine work cannot be secured around the steam pipe, for example, the wire can be wound manually, but the tension applied to the wire changes during the work. There is a possibility that stable performance cannot be ensured, for example, the tension varies depending on the operator. Moreover, since it winds applying tension | tensile_strength by manual work, there exists a subject that a lot of labor and time are required for complicated work.

  This invention is made | formed in view of such a situation, The objective is to provide the reinforcement tool for piping which can be easily attached to piping in a short time.

In order to achieve the above-described object, the present invention is a reinforcing tool for a pipe which is arranged in a state surrounding the pipe in the circumferential direction along the outer peripheral surface of the metal pipe, and reinforces the pipe, A surrounding part that forms a slit along the longitudinal direction of the pipe and surrounds the outer peripheral surface; and a flange part that protrudes in an opposite direction to the pipe that is surrounded by the end part that forms the slit at the surrounding part. The flange portion includes an extended flange portion extended from the surrounding portion and a ceramic flange reinforcing portion attached to the extended flange portion, and is made of the ceramic. The flange reinforcing portion is provided between the extending flange portion and the metal protective plate, and the extending flange portions are spaced apart from each other in the circumferential direction in a state where the surrounding portion surrounds the pipe. Facing each other , Pipe the protective plates fastening screwed a nut on the bolt over, characterized in that attached to the pipe by the distance of the extending flange portions are coupled by applying a force to be narrower It is a tool for reinforcement.

  According to the reinforcing tool for piping of the present invention, since the flange portions protruding from the end portions forming the slits are joined and attached to the surrounding portion surrounding the outer peripheral surface of the piping, the piping is attached to the surrounding portion. It is possible to attach the reinforcing tool for piping easily and in a short time by simply surrounding and connecting the flange portions. At this time, since the force is applied so that the interval between the flange portions spaced apart from each other becomes narrow, a tensile stress is generated in the surrounding portion connected to the flange portion. Since this tensile stress acts to suppress expansion of the pipe surrounded by the surrounding portion, it is possible to reinforce the pipe.

In addition , the flange portions facing each other with a space therebetween are coupled by applying a force so as to attract each other, but the flange portion protrudes in the opposite direction to the pipe at the end of the surrounding portion. If the rigidity of the flange is low, only the flange portion may be deformed and a force cannot be applied appropriately. For this reason, since the flange part has the extension flange part and the flange reinforcement part made from a ceramic, a flange part is provided with high rigidity and it is possible to make force act more reliably. In particular, since the flange reinforcing portion is made of ceramic, it is possible to realize a lightweight reinforcing tool for piping.

Further , even when the flange portions are coupled so as to attract each other and a force is applied to the ceramic flange reinforcing portion, the ceramic flange reinforcing portion can be protected by the protective plate.

In such a reinforcing tool for piping, the flange portion is disposed so as to be positioned above the surrounding portion, and the protection plate has a placement portion placed on the flange reinforcement portion. Is desirable.
According to such a reinforcing tool for piping, since the placing portion of the reinforcing plate can be placed on the flange reinforcing portion, when the flange portions are attached by being biased toward each other, protection is provided. There is no need to support the board. For this reason, since the reinforcement tool for piping can be attached in the state which removed the hand from the protection board, attachment is easy.

In such a reinforcing tool for piping, the flange portions facing each other are tightened with a nut screwed on the other flange portion side to a bolt that penetrates both flange portions from one flange portion side. It is desirable that force acts.
According to such a reinforcing tool for piping, a nut is screwed into a bolt that passes through both flange portions spaced apart from each other, so that a force is applied, so that the flange can be easily and surely provided. It is possible to apply a force so that the interval between the portions becomes narrow.

In such a reinforcing tool for piping, it is preferable that the piping is disposed in the surrounding portion from the slit in which a space between the flange portions facing each other is widened.
According to such a reinforcing tool for piping, since the piping can be arranged in the surrounding portion only by widening between the flange portions facing each other, it is easy to attach the reinforcing tool for piping.

In such a reinforcing tool for piping, the surrounding portion is formed by two curved members each having one of the flange portions, and the two curved members are respectively opposite ends of the flange portion. However, it is good also as being connected so that rotation is possible.
According to such a reinforcing tool for piping, since the two curved members forming the surrounding portion are rotatably connected to the side opposite to the flange portion, the space between the flange portions facing each other can be expanded more widely. Is possible. For this reason, even if it is piping with a big diameter, it is possible to attach the reinforcement tool for piping easily.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the reinforcement tool for piping which can be easily attached to piping in a short time.

It is a perspective view explaining the composition of steam piping X reinforced with reinforcing tool 10 concerning a 1st embodiment of the present invention. It is sectional drawing explaining the structure of the steam piping X reinforced with the reinforcement tool 20 which concerns on 2nd Embodiment of this invention. It is sectional drawing explaining the modification of the reinforcing tool 20 which concerns on 2nd Embodiment of this invention. It is sectional drawing explaining the reinforcing tool 30 which concerns on 3rd Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described taking a steam pipe as an example of a metal pipe. FIG. 1 is a perspective view illustrating a configuration of a steam pipe X reinforced with a reinforcing tool 10 according to the first embodiment of the present invention.

  As shown in FIG. 1, the steam pipe X has a cylindrical shape, and power steam (steam temperature = 300 ° C. to 650 ° C., steam pressure = 5 Mpa to 8 Mpa) flows through the internal space over a long period of time. Creep is generated by power steam. Since high-temperature and high-pressure steam flows, the steam pipe X is formed of ferritic chromium steel (for example, 9Cr to 12Cr) having a low coefficient of thermal expansion (high creep strength).

  The diameter of the steam pipe X varies depending on the application, but is determined within a range of 200 mm to 1000 mm, for example. Further, the wall thickness tx of the steam pipe X is set in a range of 40 mm or more and 70 mm or less. The diameter and thickness of the steam pipe X are determined in consideration of various conditions such as the temperature, pressure, flow rate, and flow speed of the power steam.

  The portion to be reinforced in the present embodiment is a straight pipe portion that is substantially linear in the steam pipe X. Such a straight pipe portion of the steam pipe X has a length of several hundreds of meters in which a plurality of pipe members 1 formed to have a predetermined length are welded with their end portions Xa being butted in the longitudinal direction. have.

  A reinforcing tool 10 that reinforces the creep strength of the steam pipe X is attached to the straight pipe portion of the steam pipe X. The reinforcing tool 10 has a predetermined length along the longitudinal direction of the steam pipe X and is disposed in a state surrounding the steam pipe X in the circumferential direction. The reinforcing member 11 surrounds the steam pipe X, and the reinforcing member 11 is steamed. A plurality of bolts 18 and nuts 19 attached to the pipe X are provided. A plurality of the reinforcing tools 10 are used in accordance with the length of the steam pipe X, and as shown in FIG.

  The reinforcing member 11 is provided with a steam part 12 that forms a slit 11a along the longitudinal direction of the steam pipe X and surrounds the outer peripheral surface Xb of the steam pipe X, and an end part that forms the slit 11a at the surrounding part 12 and steam. It has the flange part 13 protruded in the opposite direction to the side where the piping X is arrange | positioned. The reinforcing member 11 is formed by bending the steel plate so that the inner diameter is substantially the same as the diameter of the outer peripheral surface Xb of the steam pipe X, and the circumferential length of the inner peripheral surface of the surrounding section 12 is the steam pipe X. The outer circumferential surface Xb is slightly shorter than the circumferential length. For this reason, when the steam pipe X is surrounded by the surrounding part 12, the slit 11a is formed along the longitudinal direction of the steam pipe X.

  The steel plate forming the surrounding portion 12 has an extending flange portion 14 extending from the edge forming the slit 11a of the surrounding portion 12 in a direction opposite to the side where the steam pipe X is surrounded. The extended flange portions 14 provided on both sides of the slit 11a are opposed to each other with an interval s in the circumferential direction. Each extended flange portion 14 is welded along the longitudinal direction with a flange reinforcing portion 15 made of metal and having a square bar shape on the opposite side to the opposite side. That is, the flange portion 13 of the reinforcing member 11 is constituted by the extended flange portion 14 and the flange reinforcing portion 15.

  Each flange portion 13 of the reinforcing member 11 has a plurality of through holes (not shown) through which the bolts 18 are passed, and the through holes (not shown) provided in each flange portion 13 are opposed to each other in the longitudinal direction. Are provided at appropriate intervals.

  The steel plate and the flange reinforcing portion 15 that form the surrounding portion 12 and the extended flange portion 14 are formed of a material having a higher creep strength than the material of the steam pipe X (ferritic chromium steel). For example, stainless steel, nickel alloy, cobalt alloy, and high chromium steel are used. Thus, the reinforcement strength with respect to the steam pipe X is raised by making the raw material of the steel plate which forms the surrounding part 12 and the extension flange part 14 into a raw material with a creep strength larger than the raw material of the steam pipe X.

  The plate thickness ta of the steel plate forming the surrounding portion 12 and the extended flange portion 14 is determined to be thinner than the wall thickness tx of the steam pipe X. For example, when the steam pipe X is made of 9 chrome steel having a wall thickness of 40 mm and the reinforcing member 21 is made of austenitic stainless steel (for example, SUS304), the plate thickness ta of the steel plate is set in the range of 5 mm to 15 mm. It is done. That is, the plate thickness ta of the steel plate is determined to be about 1/8 to 3/8 of the wall thickness tx of the steam pipe X.

  Further, the bolt 18 penetrating the flange portion 13 and the nut 19 screwed into the bolt 18 are formed of a material having a creep strength higher than that of the material of the steam pipe X, like the reinforcing member 11. In the present embodiment, the reinforcing member 11 is made of the same material, for example, stainless steel such as SUS304.

  In the mounting method of the reinforcing tool 10 according to the present embodiment, first, the slit 11a of the reinforcing member 11 in which the bolt 18 is not inserted into a through hole (not shown) is widened, and is nearly parallel to the steam pipe X and widened. The steam pipe X is accommodated in the surrounding portion 12 from the slit 11a. At this time, the two flange portions 13 of the reinforcing member 11 are opposed to each other at an interval s in the circumferential direction.

  Next, a nut 19 is screwed into a bolt 18 that is passed through the two flange portions 13 of the reinforcing member 11 in which the steam pipe X is accommodated so as to straddle the slit 11a. That is, the bolt 18 penetrates through the through hole (not shown) of one flange portion 13 and the through hole (not shown) of the other flange portion 13 of the two flange portions 13 of the reinforcing member 11 facing each other. A nut 19 is screwed from the tip of 18 to couple the two flange portions 13 together.

  By tightening the bolts 18 into which the nuts 19 are screwed, the flange portions 13 that are opposed to each other are subjected to compressive stress so that the distance between the flange portions 13 is narrowed. At this time, a tensile stress is generated in the surrounding portion 12 connected to the flange portion 13 that is attracted to each other, and this tensile stress acts in a direction to suppress the expansion of the steam pipe X. The tensile stress acting on the steam pipe X and occurring in the surrounding portion 12 can be changed by tightening the bolt 18 and the nut 19.

  According to the reinforcing tool 10 for the steam pipe X of the present embodiment, the flange portions 13 that protrude from the end portions that form the slits 11a are coupled to each other at the surrounding portion 12 that surrounds the outer peripheral surface Xb of the steam pipe X. Therefore, the reinforcing tool 10 for the steam pipe X can be attached easily and in a short time only by surrounding the steam pipe X with the surrounding part 12 and connecting the flange parts 13 together. At this time, since the flange portions 13 spaced apart from each other by the distance s are coupled to each other by applying a force so that the distance is narrowed, a tensile stress is generated in the surrounding portion 12 connected to the flange portion 13. Since this tensile stress acts to suppress expansion of the steam pipe X surrounded by the surrounding portion 12, the steam pipe X can be reinforced.

  In addition, the flange portions 13 that are opposed to each other with a gap s are coupled to each other by applying a force so that the gap is narrow, but the flange portion 13 is opposite to the steam pipe X at the end of the surrounding portion 12. Since it protrudes in the direction, when the rigidity of the flange portion 13 is low, there is a possibility that only the flange portion is deformed and a force cannot be applied appropriately. For this reason, the flange portion 13 is constituted by an extended flange portion 14 made of a steel plate connected to the surrounding portion 12 and a stainless steel flange reinforcing portion 15 attached to the extended flange portion 14. 13 has a high rigidity, so that the force can be applied more reliably.

  Further, since the nut 19 screwed into the bolt 18 penetrating the two flange portions 13 spaced from each other by the distance s is tightened and the force acts so that the interval between the flange portions 13 is narrowed, It is possible to apply a force reliably and to adjust the magnitude of the force.

  Further, the steam pipe X disposed in the surrounding portion 12 can be disposed in the surrounding portion 12 simply by widening the gap between the flange portions 13 facing each other, so that the reinforcing tool 10 can be easily attached. is there.

  Moreover, since the steel plate and the flange reinforcement part 15 which form the surrounding part 12 and the extension flange part 14 are formed with the metal whose creep strength is higher than the metal which comprises the steam piping X which is a reinforcement object, the reinforcement member 11 is used. It is possible to increase the yield strength.

FIG. 2 is a cross-sectional view illustrating the configuration of the steam pipe X reinforced with the reinforcing tool 20 according to the second embodiment of the present invention.
In the said embodiment, although the example which made the flange reinforcement part 15 the same stainless steel as the steel plate which forms the surrounding part 12 and the extension flange part 14 was demonstrated, the flange reinforcement part 15 of stainless steel is heavy and steam piping. The burden on X increases. For this reason, the flange reinforcing portion 25 is made of a ceramic having high toughness (fracture toughness value 6.0 MPa√m or more), high thermal shock resistance (500 ° C. or more), and high three-point bending strength (400 MPa or more), for example, chip. You may form by silicon-ceramics type | system | group ceramics (for example, sialon) or a ceramic matrix composite material (Ceramic * Matrix * Composites: CMC).

  When using a ceramic flange reinforcement, if the bolt and nut are tightened in contact with the ceramic flange reinforcement, the flange reinforcement may be damaged. For this reason, for example, as shown in FIG. 2, the reinforcing tool 20 of the second embodiment is a protection made of, for example, stainless steel between a flange reinforcing portion 25 made of silicon nitride ceramics, a bolt 18 and a nut 19. A plate 22 is interposed.

  According to the reinforcing tool 20 of the second embodiment, the flange portion 23 includes the extended flange portion 14 made of a steel plate connected to the surrounding portion 12, and the silicon nitride ceramic flange attached to the extended flange portion 14. By comprising with the reinforcement part 25, the flange part 23 has high rigidity and it is possible to make force act more reliably. In particular, since the flange reinforcing portion 25 is made of silicon nitride-based ceramic, a lightweight reinforcing tool 20 can be realized, and the burden on the steam pipe X can be reduced.

  Further, even when the flange portions 23 are connected so as to attract each other and a force is applied to the flange reinforcing portion 23 made of silicon nitride ceramics, the flange reinforcement made of silicon nitride ceramics is protected by the protective plate 22. It is possible to prevent damage to the portion 25.

FIG. 3 is a cross-sectional view illustrating a modified example of the reinforcing tool 20 according to the second embodiment of the present invention.
When the protective plate 22 is interposed between the flange reinforcing portion 25 made of silicon nitride ceramics and the bolt 18 and the nut 19 as in the second embodiment, the flange portion 23 is used when the protective plate 22 is a flat plate. When the bolts 18 are inserted into the bolts 18 and the nuts 19 are screwed into the inserted bolts 18, it is necessary to support the protective plate 22, which makes the operation more complicated. For this reason, as shown in FIG. 3, the cross section provided with the interposition part 24a interposed between the flange reinforcement part 25, the volt | bolt 18, and the nut 19 and the orthogonal part 24b orthogonal to the interposition part 24a is L-shaped. It is desirable to use a protective plate 24 that forms the following.

  When the L-shaped protection plate 24 is used, the reinforcing member 28 is attached to the steam pipe X so that the flange portion 23 is located above the surrounding portion 12, and the protection plate 24 reinforces the orthogonal portion 24b by flange reinforcement. It is placed on the section 25 and arranged. As a result, it becomes possible to release the hand from the protective plate 24 in a state where the intervening portion 24a is disposed at a position sandwiching the flange reinforcing portion 25 between the intervening portion 24a of the protective plate 24 and the extending flange portion, and the flange portion 23 can be easily removed. It is possible to insert the bolt 18 into the nut 18 and screw the nut 19 into the inserted bolt 18. For this reason, since the reinforcing tool 20 can be attached in a state where the hand is released from the protection plate 24, the attachment is easy.

FIG. 4 is a cross-sectional view illustrating a reinforcing tool 30 according to the third embodiment of the present invention.
In the above-described embodiment, the example in which the surrounding portion 12 is integrally formed has been described. However, the present invention is not limited thereto. For example, the surrounding portion 29 is divided along the longitudinal direction of the steam pipe X as shown in FIG. The reinforcing member 27 may be formed by the two bending members 29a, and the divided end portions may constitute a hinge 26 and be rotatably connected.

  According to the reinforcing tool 30 of the third embodiment, the divided end portions of the two bending members 29a and 29b that form the surrounding portion 29 rotate with the hinge 26, so that the flange portion 13 that faces each other is interposed. Can be spread more widely. For this reason, even if it is the steam piping X with a large diameter, it is possible to attach the reinforcement tool 30 easily. At this time, if the position of the hinge 26 is arranged on the opposite side of the flange portion 13 in the diameter direction of the steam pipe X, the space between the flange portions 13 can be more widely spread.

  In the above-described embodiment, the example in which the member that joins the flange portions 13 and 23 is configured by the bolt 18 and the nut 19 has been described. However, the configuration is not limited thereto. For example, like a vise, you may press a pair of flange parts toward the inside from the outside.

  Moreover, piping is not restricted to what flows the steam for motive power. The present invention can be applied to any steam pipe X through which high-temperature and high-pressure steam similar to power steam flows and which undergoes creep degradation. Moreover, in the said embodiment, although the example which attached the reinforcing tools 10, 20, and 30 to the straight pipe part of the steam piping X was demonstrated, even if it is the bending part of the steam piping X, it reinforces according to the bending part. If the length of the tool 10, 20, 30 is changed, it can be attached.

DESCRIPTION OF SYMBOLS 1 Piping member, 10 Reinforcing tool, 11 Reinforcing member, 11a Slit, 12 Enclosure part, 13 Flange part, 14 Extension flange part, 15 Flange reinforcement part,
18 bolts, 19 nuts, 20 reinforcing tools, 21 reinforcing members, 22 protective plates,
23 flange part, 24 protective plate, 24a intervening part, 24b orthogonal part,
25 flange reinforcing part, 26 hinge, 27 reinforcing member, 28 reinforcing member,
29 Go part, 29a Curved member, 30 Reinforcing tool,
s Flange spacing, X steam pipe, Xa steam pipe end, Xb steam pipe outer peripheral surface,
ta Steel plate thickness, tx thickness of steam pipe

Claims (5)

It is arranged in a state surrounding the pipe in the circumferential direction along the outer peripheral surface of the metal pipe, and is a reinforcing tool for piping that reinforces the pipe,
A surrounding part that forms a slit along the longitudinal direction of the pipe and surrounds the outer peripheral surface;
Each of the end portions forming the slits in the surrounding portion has a flange portion protruding in the opposite direction to the piping to be surrounded,
The flange portion extends from the surrounding portion and extends,
A ceramic flange reinforcing portion attached to the extending flange portion,
The ceramic flange reinforcing portion is provided between the extended flange portion and a metal protective plate,
In a state where the surrounding portion surrounds the pipe, the extending flange portions are opposed to each other in the circumferential direction with a space therebetween,
A pipe for attaching to the pipe by screwing and tightening a nut to a bolt extending between the protective plates, and by applying a force so that a distance between the extended flange portions is narrowed. Reinforcement tool. The flange portion is arranged to be located above the surrounding portion,
The protective plate, the reinforcing tool for pipes according to claim 1, characterized in that it has a mounting portion to be mounted on said flange reinforcing portion. The flange portions facing each other are characterized in that the force acts by tightening a nut screwed on the other flange portion side to a bolt penetrating both flange portions from one flange portion side. The piping reinforcing tool according to claim 1 or 2 . The said piping is arrange | positioned in the said enclosure part from the said slit from which the said flange part which mutually opposes was expanded, The reinforcement tool for piping in any one of the Claims 1 thru | or 3 characterized by the above-mentioned. The surrounding portion is formed of two curved members each having one of the flange portions,
Each said two curved members, ends opposite to the flange portion, the reinforcement of the pipe according to any one of claims 1 to 4, characterized in that it is pivotally connected Tools.

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