JP2016017534A - Process of manufacturing pipeline protective cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process of manufacturing a pipeline protective cover which enables the manufacturing of a pipeline protective cover capable of restraining the fluid blowout toward the pipeline circumference and the progress of the pipeline breaking at a low cost.SOLUTION: A process of manufacturing a pipeline protective cover comprises the steps of: forming a semi-tubular type split outer cylinder 11a by press working a first flat plate material 31; forming semi-tubular type split pressure receiving components 14a and 15a by press working a second flat plate material 32; forming a split cover 33 by fixing the split pressure receiving components 14a and 15a at prescribed positions in an axial direction on an internal surface of the split outer cylinder 11a; and butting mutual end parts of two split covers 33 in a circumferential direction and fixing them.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a method for manufacturing a piping protective cover that suppresses the progress of fluid squirting and rupture of a pipe when, for example, a rupture occurs in the pipe through which a high-temperature and high-pressure fluid passes.

  Conventionally, for example, a pipe protection device (pipe whip and jet force prevention device) described in Patent Document 1 has a plurality of clamp pipe members having a shape that can be adapted to the outside of the pipe, and pipes the plurality of clamp pipe members. The clamp pipe members are arranged in contact with the outside of the pipe, and a plurality of clamp pipe members constitute the clamp pipe so that the pipes are tightly held and clamped. Further, in the pipe protection device described in Patent Document 1, a locking member is fixedly protruded on the outside of the pipe, and a through-hole penetrating in the thickness direction is formed in at least one clamp pipe member. By inserting the locking member into the pipe, the pipe is prevented from coming out of the clamp pipe.

JP-A-55-97594

  The pipe protection device described in Patent Document 1 described above merely inserts a through hole of a clamp pipe member that forms a clamp pipe into a pipe locking member. High temperature and high pressure fluid will be ejected to the outside. As described above, it is difficult for the pipe protection device described in Patent Document 1 to suppress the ejection of fluid. As a result, the influence of the ejected fluid on the structure around the pipe or the surroundings of the pipe due to the vapor of the fluid. It is difficult to protect the structure and the equipment because it has the effect of causing a failure in the equipment (such as electrical equipment).

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and a method for manufacturing a pipe protection cover that can manufacture a pipe protection cover that can suppress the progress of fluid ejection and pipe breakage at low cost. The purpose is to provide.

  In order to achieve the above-mentioned object, the manufacturing method of the pipe protection cover according to the present invention engages with a projection fixed to the outer surface of the pipe at the inner surface end of the outer cylinder covering the outer periphery of the pipe in the axial direction. Forming a split outer cylinder having a semi-cylindrical shape by pressing the first flat plate material and pressing the second flat plate material in the pipe protective cover to which the locking member that prevents the movement of the pipe is fixed Forming a semi-cylindrical split locking member, fixing the split locking member at a predetermined axial position on the inner surface of the split outer cylinder, and forming a split cover; And a step of abutting and fixing the end portions in the circumferential direction of the divided cover.

  Accordingly, the first flat plate member and the first flat plate member are pressed to form a semi-cylindrical divided outer cylinder and a divided locking member, and the divided locking member is fixed to the inner surface of the divided outer cylinder and the divided cover is formed. The pipe protective cover is manufactured by abutting and fixing the ends of the two divided covers. Therefore, it is possible to manufacture a pipe protection cover capable of suppressing the progress of fluid ejection and pipe breakage around the pipe at a low cost.

  The manufacturing method of the piping protective cover according to the present invention includes a locking member that locks on the inner surface end portion of the outer cylinder that covers the outer periphery of the piping to a protrusion fixed to the outer surface of the piping and prevents movement in the axial direction. In the pipe protective cover to which the divided locking member is fixed, the divided flat member is fixed at a predetermined position in the axial direction on the inner surface of the divided outer cylinder by pressing the second flat plate on the first flat plate. A step of forming, and a step of abutting and fixing circumferential ends of the two divided covers.

  Accordingly, the second flat plate material is overlapped with the first flat plate material and pressed to form a divided cover in which the divided locking member is fixed at a predetermined position in the axial direction on the inner surface of the divided outer cylinder. A pipe protective cover is manufactured by abutting and fixing the ends of the cover. Therefore, it is possible to manufacture a pipe protection cover capable of suppressing the progress of fluid ejection and pipe breakage around the pipe at a low cost. Moreover, since two flat plates are stacked and pressed, the number of press processes is reduced, and the divided outer cylinder and the divided locking member are fitted after pressing so that the fixing work of both is simplified. And workability can be improved.

  In the manufacturing method of the piping protective cover of the present invention, the divided locking member is fixed to one end and the other end in the axial direction on the inner surface of the divided outer cylinder.

  Accordingly, by fixing the division locking member to one end and the other end in the axial direction on the inner surface of the divided outer cylinder, for example, a pipe protection cover can be easily attached to the pipe even if there is no supporting member around it. be able to.

  In the manufacturing method of the piping protective cover of the present invention, the divided locking member is fixed to one end portion in the axial direction on the inner surface of the divided outer cylinder, and the mounting flange is fixed to the other end portion.

  Accordingly, by fixing the split locking member to one end portion in the axial direction on the inner surface of the split outer cylinder and fixing the mounting flange to the other end portion, for example, the mounting flange may be fixed to a member supported around. The piping protective cover can be easily attached to the piping.

  In the method for manufacturing a piping protective cover according to the present invention, the second flat plate material is stacked on the intermediate portion in the longitudinal direction of the first flat plate material and press-worked to the axial intermediate portion of the inner surface of the divided outer cylinder. The divided locking member is fixed to form a divided cover main body, and the divided cover main body is cut at an intermediate position in the axial direction to form two divided covers.

  Therefore, since the divided cover body formed by stacking and pressing the two flat plates is cut at the intermediate position to form the divided cover, two divided covers can be formed in one process. The work cost can be reduced and the work time can be shortened.

  In the method for manufacturing a piping protective cover according to the present invention, the second flat plate material is stacked on the intermediate portion in the longitudinal direction of the first flat plate material and press-worked to the axial intermediate portion of the inner surface of the divided outer cylinder. The divided locking member is fixed to form a divided cover main body, and the two divided cover main bodies are overlapped in a cylindrical shape and cut at an intermediate position in the axial direction.

  Therefore, since the divided cover body formed by stacking and pressing two flat plates is overlapped in a cylindrical shape and cut at an intermediate position to form a divided cover, two pipe protections are performed in one process. The cover can be formed, the work cost can be reduced, and the work time can be shortened.

  In the pipe protective cover manufacturing method of the present invention, the side cover member that closes the gap with the outer surface of the pipe is fixed to the end of the split outer cylinder to which the split locking member of the split cover is fixed. It is said.

  Therefore, the clearance gap between the edge part of a division | segmentation cover and the outer surface of piping can be reduced, and the external leakage of the fluid which leaked from piping can be suppressed.

  According to the manufacturing method of the piping protective cover of the present invention, the outer cylinder, the divided locking member, or the divided cover is formed by pressing the first flat plate material and the second flat plate material individually or in piles. Therefore, it is possible to manufacture a pipe protective cover that can suppress the progress of fluid ejection and pipe breakage around the pipe at low cost.

FIG. 1 is a schematic configuration diagram showing a nuclear facility. FIG. 2 is a partially cutaway front view showing the pipe protection device of the first embodiment. FIG. 3 is a perspective view showing the pipe protection device. FIG. 4 is a cross-sectional view in the pipe extending direction in the pipe protection device. FIG. 5 is a side view showing the pipe protection device. 6 is a cross-sectional view taken along the line VI-VI in FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is a cross-sectional view of a main part in the pipe protection device. FIG. 9 is a perspective view illustrating a method for manufacturing the piping protective cover of the first embodiment. FIG. 10 is a perspective view showing a split outer cylinder. FIG. 11 is a perspective view illustrating a divided pressure receiving member. FIG. 12 is a perspective view showing a divided cover. FIG. 13 is a perspective view illustrating a method for manufacturing the piping protective cover of the second embodiment. FIG. 14 is a perspective view showing a divided cover. FIG. 15 is a cross-sectional view in the pipe extending direction in the pipe protection device of the third embodiment. FIG. 16 is a perspective view illustrating a method for manufacturing the piping protective cover of the third embodiment. FIG. 17 is a perspective view showing the split cover main body. FIG. 18 is a perspective view showing a divided cover.

  Hereinafter, an embodiment of a method for manufacturing a piping protective cover according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[First Embodiment]
FIG. 1 is a schematic configuration diagram illustrating a nuclear facility according to the first embodiment. The nuclear facility shown in FIG. 1 is a pressurized water reactor (PWR). In this nuclear power facility, a reactor pressure vessel 101, a pressurizer 102, a steam generator 103, and a primary cooling water pump 104 are sequentially connected by a primary cooling water pipe 105 in a reactor containment vessel 100, and primary cooling that is a fluid is performed. A water circulation path is constructed.

  The reactor pressure vessel 101 stores therein a plurality of fuel assemblies 101a, which are cores, in a sealed state, and a vessel body 101b and a vessel lid 101c mounted on the upper portion thereof so that the fuel assemblies 101a can be inserted and removed. It is comprised by. The container lid 101c is provided so as to be openable and closable with respect to the container main body 101b. The container body 101b has a cylindrical shape with an upper opening and a lower hemisphere that is closed, and an inlet-side nozzle 101d and an outlet-side nozzle 101e that supply and discharge light water as primary cooling water at the upper part. Is provided. The outlet side nozzle 101e is connected to the primary cooling water pipe 105 so as to communicate with the inlet side water chamber 103a of the steam generator 103. The inlet side nozzle 101d is connected to the primary cooling water pipe 105 so as to communicate with the outlet side water chamber 103b of the steam generator 103.

  The steam generator 103 is provided with an inlet-side water chamber 103a and an outlet-side water chamber 103b partitioned by a partition plate 103c in a lower part formed in a hemispherical shape. The inlet side water chamber 103a and the outlet side water chamber 103b are separated from the upper side of the steam generator 103 by a tube plate 103d provided on the ceiling portion. On the upper side of the steam generator 103, an inverted U-shaped heat transfer tube 103e is provided. Each end of the heat transfer tube 103e is supported by the tube plate 103d so as to connect the inlet side water chamber 103a and the outlet side water chamber 103b. The inlet-side water chamber 103a is connected to the inlet-side primary cooling water pipe 105, and the outlet-side water chamber 103b is connected to the outlet-side primary cooling water pipe 105. In addition, the steam generator 103 is connected to the upper side upper end partitioned by the tube plate 103d, the outlet side secondary cooling water pipe 106a, and the upper side part is connected to the inlet side secondary cooling water pipe 106b. Has been.

  Further, in the nuclear power facility, the steam generator 103 is connected to the steam turbine 107 via the secondary cooling water pipes 106a and 106b outside the reactor containment vessel 100, so that a circulation path of secondary cooling water that is a fluid is configured. ing.

  The steam turbine 107 includes a high-pressure turbine 108 and a low-pressure turbine 109, and a generator 110 is connected thereto. In addition, the high-pressure turbine 108 and the low-pressure turbine 109 are connected to a moisture separation heater 111 that is branched from the secondary cooling water pipe 106a. The secondary cooling water pipe 106 a is provided with a steam isolation valve (open / close valve) 119 on the way from the steam generator 103 to the high pressure turbine 108 and the low pressure turbine 109. The steam isolation valve 119 is closed in an emergency or the like, and the steam from the steam generator 103 to the high pressure turbine 108 and the low pressure turbine 109 is isolated. The low pressure turbine 109 is connected to the condenser 112. The condenser 112 is connected to the secondary cooling water pipe 106b. The secondary cooling water pipe 106b is connected to the steam generator 103 as described above, and reaches from the condenser 112 to the steam generator 103, and the condensate pump 113, the low-pressure feed water heater 114, the deaerator 115, and the main feed water pump. 116, a high-pressure feed water heater 117 and a main feed water valve (open / close valve) 118 are provided.

  Therefore, in the nuclear power facility, the primary cooling water is heated in the reactor pressure vessel 101 to become a high temperature and a high pressure, and is pressurized by the pressurizer 102 to maintain the pressure constant, while the steam is passed through the primary cooling water pipe 105. It is supplied to the generator 103. In the steam generator 103, heat exchange between the primary cooling water and the secondary cooling water is performed, whereby the secondary cooling water evaporates and becomes steam. The cooled primary cooling water after heat exchange is recovered to the primary cooling water pump 104 side via the primary cooling water pipe 105 and returned to the reactor pressure vessel 101. On the other hand, the secondary cooling water converted into steam by heat exchange is supplied to the steam turbine 107. In connection with the steam turbine 107, the moisture separator / heater 111 removes moisture from the exhaust from the high-pressure turbine 108, further heats it to an overheated state, and then sends it to the low-pressure turbine 109. The steam turbine 107 is driven by the steam of the secondary cooling water, and the power is transmitted to the generator 110 to generate power. Steam used for driving the turbine is discharged to the condenser 112. The condenser 112 exchanges heat between the cooling water (for example, seawater) taken by the pump 112b through the intake pipe 112a and the steam discharged from the low-pressure turbine 109, and condenses the steam to produce a low-pressure saturated liquid. Return to. The cooling water used for heat exchange is discharged from the drain pipe 112c. Further, the condensed saturated liquid becomes secondary cooling water, and is sent out of the condenser 112 by the condensate pump 113 through the secondary cooling water pipe 106b. Further, the secondary cooling water passing through the secondary cooling water pipe 106b is heated by the low-pressure feed water heater 114, for example, by the low-pressure steam extracted from the low-pressure turbine 109, and dissolved oxygen and non-condensed gas (ammonia gas) in the deaerator 115. After the impurities such as) are removed, the water is fed by the main feed pump 116 and heated by the high-pressure steam extracted from the high-pressure turbine 108 by the high-pressure feed water heater 117 and then returned to the steam generator 103. Here, a system for supplying secondary cooling water to the steam generator 103 is referred to as a main water supply system. In the main water supply system, the main water supply pump 116, the main water supply valve 118, and the like are controlled in order to maintain the water level of the secondary cooling water of the steam generator 103.

  2 is a partially cutaway front view showing the pipe protection device of the first embodiment, FIG. 3 is a perspective view showing the pipe protection device, FIG. 4 is a cross-sectional view in the pipe extending direction in the pipe protection device, and FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4, FIG. 7 is a sectional view taken along line VII-VII in FIG. 4, and FIG. .

  The pipe protection device 10 of the present embodiment is applied to the nuclear facility as described above. For example, the pipe protection device 10 is disposed in the secondary cooling water pipes 106a and 106b as pipes through which the secondary cooling water that is a fluid is circulated in a nuclear facility. Specifically, in the secondary cooling water pipe 106a, the pipe protection device 10 includes a part immediately after being pulled out of the partition wall 100a of the reactor containment vessel 100 or equipment (steam generator 103, high pressure turbine 108, low pressure turbine 109). , Moisture separation heater 111 and steam isolation valve 119). Further, in the secondary cooling water pipe 106b, the pipe protection device 10 is a part immediately after being pulled out to the outside of the partition wall 100a of the reactor containment vessel 100 or equipment (steam generator 103, condenser 112, condensate pump 113). , The low pressure feed water heater 114, the deaerator 115, the main feed water pump 116, the high pressure feed water heater 117, and the main feed valve 118). Note that the pipe protection device 10 may be disposed at each weld connection portion in the primary cooling water pipe 105 as a pipe through which the primary cooling water that is a fluid is circulated in a nuclear facility. Moreover, the pipe protection device 10 according to the present embodiment is not limited to nuclear facilities, but is applied to pipes through which high-temperature and high-pressure fluid flows. The fluid includes liquid such as high temperature water and gas such as steam.

  In the first embodiment, as shown in FIGS. 2 to 7, the pipe protection device 10 is provided outside the pipe 106 having a circular cross section, and includes an outer cylinder 11 and a pair of side cover members 12. , 13, a pair of pressure receiving members (locking members) 14, 15, and a pair of protrusions 16, 17.

  The outer cylinder 11 is provided outside the pipe 106 through which a fluid flows, such as the secondary cooling water pipes 106a and 106b and the primary cooling water pipe 105 described above. The outer cylinder 11 covers the outer periphery of the predetermined portion of the pipe 106 as described above, and is formed in a cylindrical shape along the extending direction (axial direction) of the pipe 106. Therefore, the outer cylinder 11 has a circular cross section, and the inner diameter is set larger than the outer diameter of the pipe 106 by a predetermined amount.

  The outer cylinder 11 is constituted by a plurality of (two in the present embodiment) divided outer cylinders 11a divided in the radial direction because it is necessary to attach the outer cylinder 11 to the outer peripheral side of the existing pipe 106 later. The outer cylinder 11 is arranged so that each divided outer cylinder 11 a covers the outer periphery of the pipe 106, and a portion where the respective divided outer cylinders 11 a are abutted is welded to each other so as to be attached to the outside of the pipe 106. . Therefore, when the outer cylinder 11 is assembled outside the pipe 106, the space S is secured between the outer peripheral surface of the pipe 106 and the inner peripheral surface of the outer cylinder 11. The outer cylinder 11 is made of a material capable of maintaining rigidity, for example, carbon steel.

  The side lid members 12 and 13 are attached to one end and the other end of the outer cylinder 11 in the extending direction, and are formed in an annular shape. Therefore, the side cover members 12 and 13 have an outer diameter that is set to be substantially the same as the outer diameter of the outer cylinder 11, and an inner diameter that is set slightly larger than the outer diameter of the pipe 106.

  Since the first side lid member 12 arranged at one end of the outer cylinder 11 needs to be attached to the outer peripheral side of the existing pipe 106 later, it is divided into a plurality of (two in this embodiment) divided in the radial direction. It is comprised by the side cover member 12a. The first side lid member 12 is arranged so that each divided side lid member 12 a covers the outer periphery of the pipe 106, and the portions where the respective side lid members 12 a are abutted are welded to each other so that both are coupled. Mounted on the outside. The first side cover member 12 has one surface in contact with one end surface of the outer cylinder 11 and is fixed by welding.

  Like the first side cover member 12, the second side cover member 13 disposed at the other end of the outer cylinder 11 needs to be attached to the outer peripheral side of the existing pipe 106 later, so that a plurality of parts divided in the radial direction are provided. It is comprised by the division | segmentation side cover member 13a (in this embodiment, two pieces). The second side lid member 13 is arranged so that each divided side lid member 13 a covers the outer periphery of the pipe 106, and the portions where the respective side lid members 13 a are abutted are welded together so that the two are joined together. Mounted on the outside. Further, the second side cover member 13 has one surface in contact with the other end surface of the outer cylinder 11 and is fixed by welding.

  Therefore, as shown in detail in FIG. 8, when the side cover members 12 and 13 are assembled outside the pipe 106 and fixed to the outer cylinder 11, the outer peripheral surface of the pipe 106 and the inner side of the side cover members 12 and 13. Gap G1, G2 is ensured between the peripheral surface. The gaps G1 and G2 limit the amount of steam ejected to the environment when the pipe 10 is broken, and prevent contact with the pipe 10 when the outer cylinder 11 and the side lid member 13 are thermally deformed in the radial direction. belongs to. In addition, each side cover member 12 and 13 is formed with the material which can maintain rigidity, for example, carbon steel.

  The outer cylinder 11 and the side lid members 12 and 13 may be individually assembled to the pipe 106 and then joined together by welding. Alternatively, the outer cylinder 11 and the side lid members 12 and 13 may be joined to each other by welding in advance. It may be assembled.

  The pressure receiving members 14 and 15 are attached to one end and the other end of the outer cylinder 11 in the extending direction, and are formed in a shape close to an annular shape. Therefore, the pressure receiving members 14 and 15 are set to have an outer diameter that is substantially the same as the inner diameter of the outer cylinder 11, and the inner diameter is set slightly larger than the outer diameter of the pipe 106. The pressure receiving members 14 and 15 are fixed to the inner peripheral surface of the outer cylinder 11 and one surface of the side lid members 12 and 13.

  The first pressure receiving member 14 disposed in contact with the first side lid member 12 at one end of the outer cylinder 11 needs to be attached to the outer peripheral side of the existing pipe 106 later, and therefore, a plurality of radially divided (this embodiment) In the embodiment, it is constituted by two divided pressure receiving members 14a. The divided pressure receiving member 14 a has the same shape and is set to a length shorter than the half circumference of the outer cylinder 11. As for the 1st pressure receiving member 14, the outer peripheral surface of each division | segmentation pressure receiving member 14a contacts the inner peripheral surface of each division | segmentation outer cylinder 11a in the outer cylinder 11, and one surface of each division | segmentation pressure reception member 14a is in the 1st side cover member 12. It is in contact with one surface of each divided-side lid member 12a. In this case, each divided pressure receiving member 14 a has a length shorter than the half circumference of the outer cylinder 11, so that the upper part and the lower part on the inner circumferential surface of the outer cylinder 11 are not connected. Each divided pressure receiving member 14a is fixed to the outer cylinder 11 by welding and is fixed to the first side lid member 12 by welding. The first pressure receiving member 14 is disposed so that each divided pressure receiving member 14 a covers the outer periphery of the pipe 106.

  The second pressure receiving member 15 disposed in contact with the second side lid member 13 at the other end of the outer cylinder 11 needs to be attached to the outer peripheral side of the existing pipe 106 later, like the first pressure receiving member 14. A plurality of (two in this embodiment) divided pressure receiving members 15a divided in the radial direction are configured. The divided pressure receiving member 15 a has the same shape and is set to a length shorter than the half circumference of the outer cylinder 11. In the second pressure receiving member 15, the outer peripheral surface of each divided pressure receiving member 15 a is in contact with the inner peripheral surface of each divided outer cylinder 11 a in the outer cylinder 11, and one surface of each divided pressure receiving member 15 a is in the second side lid member 13. It is in contact with one surface of each divided-side lid member 13a. In this case, since each divided pressure receiving member 15 a has a length shorter than the half circumference of the outer cylinder 11, the upper part and the lower part on the inner peripheral surface of the outer cylinder 11 are not connected. Each divided pressure receiving member 15a is fixed to the outer cylinder 11 by welding and is fixed to the second side lid member 12 by welding. The second pressure receiving member 15 is disposed so that each divided pressure receiving member 15 a covers the outer periphery of the pipe 106.

  Therefore, as shown in detail in FIG. 8, when the pressure receiving members 14 and 15 are assembled together with the outer cylinder 11 and the side cover members 12 and 13 on the outside of the pipe 106, the outer peripheral surface of the pipe 106 and the pressure receiving members 14 and 15 are assembled. Gap G3, G4 is ensured between the inner peripheral surface of each of the two. The gaps G3 and G4 are set larger than the gaps G1 and G2. The pressure receiving members 14 and 15 are made of a material capable of maintaining rigidity, for example, carbon steel.

  The protrusions 16 and 17 are fixed to the outer peripheral surface of the pipe 106, protrude outward in the radial direction from the outer peripheral surface of the pipe 106, and are formed in a shape close to an annular shape. The protrusions 16 and 17 are fixed to each end in the extending direction at a predetermined portion of the pipe 106 covered with the outer cylinder 11. Specifically, the protrusions 16 and 17 are disposed between the pair of pressure receiving members 14 and 15 on the outer peripheral surface of the pipe 106 and adjacent to the pressure receiving members 14 and 15. Therefore, the protrusions 16 and 17 have an inner diameter set to be substantially the same as the outer diameter of the pipe 106, and the outer diameter is set slightly smaller than the inner diameter of the outer cylinder 11.

  The first protrusions 16 arranged on the first pressure receiving member 14 side of the outer cylinder 11 in the pipe 106 need to be attached later to the outer peripheral side of the existing pipe 106, so that a plurality of (in this embodiment, divided in the radial direction) 2) split projections 16a. The division | segmentation protrusion part 16a comprises the same shape, and is set to the length shorter than the half periphery of the piping 106. FIG. The first protrusions 16 are arranged such that the respective divided protrusions 16a are in contact with the outer periphery of the pipe 106, and are joined by welding. In this case, since each divided projection 16a has a length shorter than the half circumference of the pipe 106, the left and right side parts on the outer peripheral surface of the pipe 106 are not connected. The second protrusion 17 disposed on the second pressure receiving member 15 side of the outer cylinder 11 in the pipe 106 needs to be attached to the outer peripheral side of the existing pipe 106 later in the same manner as the first protrusion 16, and thus in the radial direction. A plurality of (two in the present embodiment) divided projections 17a are divided. The division | segmentation protrusion part 17a comprises the same shape, and is set to the length shorter than the half periphery of the piping 106. FIG. The 2nd projection part 17 is arranged so that each division projection part 17a may contact the perimeter of piping 106, and is joined by welding. In this case, since each divided projection 17a has a length shorter than the half circumference of the pipe 106, the left and right side parts on the outer peripheral surface of the pipe 106 are not connected.

  Therefore, as shown in detail in FIG. 8, when the protrusions 16 and 17 are fixed to the outside of the pipe 106, a gap G <b> 5 is formed between the outer peripheral surface of the protrusions 16 and 17 and the inner peripheral surface of the outer cylinder 11. G6 is secured. The protrusions 16 and 17 are made of a material that can maintain rigidity, for example, carbon steel or a metal material that can be welded to the pipe 106.

  As shown in FIG. 4, the pipe protection device 10 of the present embodiment fixes the side cover members 12 and 13 to each end portion on the inner peripheral surface of the outer cylinder 11 that covers the outer periphery of the pipe 106 and has a pressure receiving member on the inner side thereof. The projections 16 and 17 are fixed on the outer peripheral surface of the pipe 106 adjacent to the inner side of the pressure receiving members 14 and 15. That is, in the pipe protection device 10, as shown in FIG. 8, the outer cylinder 11 is disposed outside the pipe 106, and the side lid members 12 and 13 and the pressure receiving members 14 and 15 are fixed to each end of the outer cylinder 11. The protrusions 16 and 17 are fixed to the outer peripheral surface of the pipe 106 adjacent to the pressure receiving members 14 and 15. In this case, it is desirable to provide an assembly gap between the pressure receiving members 14 and 15 and the protrusions 16 and 17.

  In this embodiment, as shown in FIG. 2, the pipe 106 is supported by a peripheral supporting member 22 (such as a wall of a building or a device frame) on the fixed side by a fixing member 21, thereby protecting the pipe. The device 10 is supported by the fixing member 21.

  The fixing member 21 includes a base 21 a that is fixed to the support member 22 that supports the pipe 106, a support column 21 b that extends from the base 21 a toward the side of the pipe 106, a support column 21 b, and the pipe 106. And a connecting member (pad) 21c for connecting a reinforcing member around the support column 21b.

  The base 21a is formed in a plate shape, and is fixed to a support member 22 having rigidity in the facility. The support column 21b is formed in a columnar shape or a rectangular column shape, and a lower end portion is fixed to the base 21a. The connection member 21c is formed along the shape of the lower half portion of the pipe 106, and is a member having a shape in which a cylinder is halved. The connecting member 21 c has an inner peripheral surface formed along the outer peripheral surface shape of the pipe 106 and an outer peripheral surface formed along the inner peripheral surface shape of the outer cylinder 11. That is, the connecting member 21 c has a shape of a part of a cylinder and is disposed so as to be interposed between the pipe 106 and the outer cylinder 11. The connecting member 21c has an outer edge connected to the pipe 106 by welding. And the support pillar 21b is connected to the piping 106 by fixing an upper end part to the connection member 21c.

  In the pipe protection device 10, an opening 23 is formed in the lower part of the outer cylinder 11, and in the fixing member 21, the upper part of the support column 21 b is inserted through the opening 23. The opening 23 opens smaller than the size of the outer peripheral surface of the connection member 21c, and is formed to have substantially the same diameter as the outer diameter of the support column 21b. The opening 23 has an opening edge connected to the outer peripheral surface of the support column 21b by welding.

  As described above, the pipe protection device 10 according to the first embodiment includes the outer cylinder 11, the side lid members 12 and 13, the pressure receiving members 14 and 15, and the protrusions 16 and 17, and the outer cylinder 11 and the side lid member 12. , 13 and the pressure receiving members 14, 15 form a pipe protection cover. Here, the manufacturing method of the piping protective cover of 1st Embodiment is demonstrated.

  9 is a perspective view showing a manufacturing method of the pipe protection cover of the first embodiment, FIG. 10 is a perspective view showing a split outer cylinder, FIG. 11 is a perspective view showing a split pressure receiving member, and FIG. 12 is a split cover. FIG.

  The manufacturing method of the piping protective cover according to the first embodiment includes a step of forming the split outer cylinder 11a having a semi-cylindrical shape by pressing the first flat plate material 31, and a press processing of the second flat plate material 32. Forming the semi-cylindrical divided pressure receiving members 14a, 15a, fixing the divided pressure receiving members 14a, 15a at predetermined axial positions on the inner surface of the divided outer cylinder 11a, and forming the divided cover 33; A step of abutting and fixing the end portions in the circumferential direction of the two divided covers 33. In this case, the divided pressure receiving members 14a and 15a are respectively fixed to one end and the other end in the axial direction on the inner surface of the divided outer cylinder 11a.

  That is, as shown in FIG. 9, the press device for forming the split outer cylinder 11 a is composed of a punch 41 and a die 42. The punch 41 is formed with a convex portion 41a having a semicircular cross-sectional shape (semi-cylindrical shape) on the lower surface, and the die 42 is formed with a concave portion 42a having a semi-circular cross-sectional shape (semi-cylindrical shape) on the upper surface. The convex portion 41 of the punch 41 is formed in a shape corresponding to the inner surface shape of the divided outer cylinder 11a, and the concave portion 42a of the die 42 is formed in a shape corresponding to the outer surface shape of the divided outer cylinder 11a. The first flat plate 31 is a material of the divided outer cylinder 11a, has a rectangular shape, and is set to have a length and a width corresponding to the divided outer cylinder 11a. Therefore, by placing the first flat plate material 31 on the die 42 and lowering and pressing the punch 41, as shown in FIG. 10, it is possible to form the split outer cylinder 11a having a semi-cylindrical shape. .

  Although not shown, the press device for forming the divided pressure receiving members 14a and 15a is also composed of a punch and a die, and a convex portion is formed on the lower surface of the punch, and a concave portion is formed on the upper surface of the die. The convex portion of the punch is formed in a shape corresponding to the inner surface shape of the divided pressure receiving members 14a and 15a, and the concave portion of the die is formed in a shape corresponding to the outer surface shape of the divided pressure receiving members 14a and 15a. Each of the second flat plate members 32 is a material of the divided pressure receiving members 14a and 15a, has a rectangular shape, and is set to have a length and a width corresponding to the divided pressure receiving members 14a and 15a. Therefore, as shown in FIG. 11, the divided pressure receiving member main body 32a having a semi-cylindrical shape can be formed by placing the second flat plate material 32 on the die, lowering the punch, and pressing. The divided pressure receiving members 14a and 15a can be formed by cutting the divided pressure receiving member main body 32a along the cutting line C at an intermediate position in the axial direction.

  After that, as shown in FIG. 12, the divided cover 33 can be formed by fixing the divided pressure receiving members 14a and 15a to respective end portions in the axial direction on the inner surface of the divided outer cylinder 11a by welding. And as shown in FIG. 4, the division | segmentation piping cover is formed by fixing the division | segmentation side cover members 12a and 13a to the edge part of the division | segmentation outer cylinder 11a to which the division | segmentation pressure receiving members 14a and 15a in the division | segmentation cover 33 were fixed. It can be attached to the pipe 106 by abutting and fixing the circumferential ends of the two divided pipe protection covers. Note that the divided outer cylinder 11a and the divided pressure receiving members 14a and 15a formed by press work have a precision in the shape and dimensions of the end portions in the circumferential direction, and therefore are finished before being fixed together. It is preferable.

  In the pipe protection device 10 of the first embodiment described above, as shown in FIG. 4, when the pipe 106 breaks at the breaking position F, the pipes 106 try to be separated from each other starting from the breaking position F. That is, one (left side) of the piping 106 tries to move in the direction of arrow A, and the other (right side) tries to move in the direction of arrow B. At this time, since the protruding portions 16 and 17 abut on the pressure receiving members 14 and 15 in the piping 106, the piping 106 is prevented from moving. Therefore, although the pipe 106 flows out of the fluid from the fracture portion (fracture position F), the fluid stays in the space S covered by the outer cylinder 11 and the side cover members 12 and 13, and The ejection of fluid to the outside is suppressed. Further, since the movement of the broken pipe 106 is prevented, the pipe whip around which the broken pipe 106 swings is prevented, and the progress of the break is suppressed.

  Thus, in the manufacturing method of the piping protective cover of the first embodiment, the step of forming the split outer cylinder 11a having a semi-cylindrical shape by pressing the first flat plate 31 and the second flat plate 32 A step of forming the divided pressure receiving members 14a and 15a having a semi-cylindrical shape by pressing the divided pressure receiving members 14a and 15a at predetermined positions in the axial direction on the inner surface of the divided outer cylinder 11a. And a step of abutting and fixing the circumferential ends of the two divided covers 33.

  Therefore, the divided outer cylinder 11a and the divided pressure receiving members 14a and 15a having a semi-cylindrical shape are formed by pressing the first flat plate material 31 and the second flat plate material 32, respectively, and the divided pressure receiving member is formed on the inner surface of the divided outer cylinder 11a. 14a and 15a are fixed, the division | segmentation cover 33 is formed, and the piping protective cover is manufactured by abutting and fixing the edge parts of the two division | segmentation covers 33. FIG. Therefore, it is possible to manufacture a pipe protective cover that can suppress the flow of fluid around the pipe 106 and the progress of breakage of the pipe 106 at a low cost.

  Since the pipe protection cover needs to be attached to the outer peripheral side of the existing pipe 106 later, the pipe protective cover is constituted by a plurality of divided members divided in the radial direction. They are fixed together. Therefore, the divided outer cylinder 11a and the divided pressure receiving members 14a and 15a need to be semi-cylindrical divided members. When manufacturing a semi-cylindrical divided member, it is conceivable to manufacture a thick cylindrical member by machining it. However, when a semi-cylindrical divided member is manufactured by machining a thick-walled cylindrical member, there is a problem that a great amount of manufacturing cost and manufacturing time are required. In 1st Embodiment, the division | segmentation cover 33 is formed by forming the division | segmentation outer cylinder 11a and division | segmentation pressure receiving members 14a and 15a which make the semi-cylindrical shape by press-working the flat materials 31 and 32, and fixing both. The pipe protective cover can be manufactured at a low cost and in a short time.

  Further, in the pipe protection device of the first embodiment, the outer cylinder 11 that covers the outer periphery of the pipe 106 through which the fluid flows, and one axial end and the other end of the inner peripheral surface of the outer cylinder 11 are fixed. A pair of pressure receiving members (locking members) 14 and 15 and a pair of protrusions 16 and 17 fixed adjacently between the pair of pressure receiving members 14 and 15 on the outer peripheral surface of the pipe 106 are provided. .

  Therefore, since the outer periphery is covered with the outer cylinder 11 when the pipe 106 is broken, the fluid ejected from the fractured portion is blocked by the outer cylinder 11, and the ejection of the fluid around the pipe 106 is suppressed. be able to. Moreover, the pressure receiving members 14 and 15 are fixed to the respective end portions on the inner peripheral surface of the outer cylinder 11, and the protrusions 16 and 17 are fixed to the respective end portions on the outer peripheral surface of the pipe 106. The protrusions 16 and 17 of the 106 are locked to the pressure receiving members 14 and 15 of the outer cylinder 11, so that the operation of separating the pipe 106 from the fracture portion is prevented, and the progress of the fracture in the pipe 106 can be suppressed. As a result, it is possible to prevent the fluid ejected from the pipe 106 from affecting the structures and equipment around the pipe 106 and protect the structures and equipment.

  Further, it is not necessary to install a pipe whip or a jet barrier that blocks the fluid ejected from the pipe 106 in the structure, and it is possible to eliminate the action of a large load on the structure side. Further, by suppressing the ejection of fluid around the pipe 106, there is no need for partitioning for physically separating the pipe 106 and safety-important equipment, and this affects the building shape of the equipment. Can be prevented.

[Second Embodiment]
FIG. 13 is a perspective view illustrating a method for manufacturing a pipe protection cover according to the second embodiment, and FIG. 14 is a perspective view illustrating a divided cover. The basic configuration of the pipe protection device of the present embodiment is substantially the same as that of the first embodiment described above, and will be described with reference to FIG. 4 and has the same functions as those of the first embodiment described above. The members having the same reference numerals are given the detailed descriptions thereof.

  In the second embodiment, as shown in FIG. 4, the pipe protection device 10 is provided outside the pipe 106 having a circular cross section, and includes an outer cylinder 11, a pair of side cover members 12, 13, and the like. And a pair of pressure receiving members (locking members) 14 and 15 and a pair of protrusions 16 and 17.

  And the manufacturing method of the piping protective cover of 2nd Embodiment is shown in FIG.13 and FIG.14. The 2nd flat plate material 52 is piled up on the 1st flat plate material 51, and it press-processes, and the inner surface of the division | segmentation outer cylinder 11a is carried out. A split cover 53 in which the divided pressure receiving members 14a and 15a are fixed to the axial ends thereof, and a step of abutting and fixing the circumferential ends of the two split covers 53 together. ing.

  That is, although not shown, the press device for forming the divided cover 53 is composed of a punch and a die as in the first embodiment, and the punch has a semicircular cross-sectional shape (semi-cylindrical shape) on the lower surface. The die is formed with a concave portion having a semicircular cross-sectional shape (semi-cylindrical shape) on the upper surface. The convex portion of the punch is formed in a shape corresponding to the inner surface shape of the divided cover 53 (the divided outer cylinder 11a and the divided pressure receiving members 14a and 15a), and the concave portion of the die is divided into the divided cover 53 (the divided outer cylinder 11a and the divided pressure receiving member). It is formed in a shape corresponding to the outer shape of the members 14a, 15a). Therefore, as shown in FIG. 13, the first flat plate material 51 is placed on the die, the second flat plate material 52 is placed on each end in the longitudinal direction on the first flat plate material 51, and the punch is lowered. Then, as shown in FIG. 14, the split cover 53 having a semi-cylindrical shape can be formed by pressing.

  Thereafter, as shown in FIG. 4, the divided side cover members 12a and 13a are fixed to the end portions of the divided outer cylinder 11a to which the divided pressure receiving members 14a and 15a of the divided cover 53 are fixed, thereby forming a divided pipe protective cover. It can be attached to the pipe 106 by abutting and fixing the circumferential ends of the two divided pipe protection covers.

  Thus, in the manufacturing method of the piping protective cover of 2nd Embodiment, the edge part of the axial direction in the inner surface of the division | segmentation outer cylinder 11a is carried out by putting the 2nd flat plate material 52 on the 1st flat plate material 51, and pressing. The split cover 53 to which the split pressure receiving members 14a and 15a are fixed, and the step of abutting and fixing the end portions in the circumferential direction of the two split covers 53.

  Accordingly, the second flat plate 52 is overlapped with the first flat plate 51 and pressed to form the divided cover 53 in which the divided pressure receiving members 14a and 15a are fixed to the respective axial ends of the inner surface of the divided outer cylinder 11a. A pipe protection cover is manufactured by abutting and fixing the ends of the two divided covers 53. Therefore, it is possible to manufacture a pipe protective cover that can suppress the flow of fluid around the pipe 106 and the progress of breakage of the pipe 106 at a low cost.

  In addition, since the divided cover 53 is formed by pressing the two flat plates 51 and 52 in a stacked manner, the number of times of pressing is smaller than pressing the first flat plate 51 and the second flat plate 52 separately. In addition, since the flat plate members 51 and 52 are integrally pressed, they are in a fitted state, and the fixing work between the divided outer cylinder 11a and the divided pressure receiving members 14a and 15a can be simplified. Workability can be improved.

[Third Embodiment]
FIG. 15 is a cross-sectional view in the pipe extending direction of the pipe protection device of the third embodiment, FIG. 16 is a perspective view showing a method of manufacturing the pipe protection cover of the third embodiment, and FIG. FIG. 18 is a perspective view showing a divided cover.

  In the third embodiment, as shown in FIG. 15, the pipe protection device 60 is provided outside the pipe 106 having a circular cross section, and includes an outer cylinder 61, a side lid member 62, a pressure receiving member ( (Locking member) 63 and a protrusion 64. Here, one end portion of the pipe 106 in the extending direction is inserted into a through hole 72 formed in the wall portion (support member) 71 and is fixed to the wall portion 71 by a fixing member (not shown). The pipe 106 has a curved shape at the other end exposed from the through hole 72 of the wall 71.

  The outer cylinder 61 covers the outer periphery of a predetermined part of the pipe 106 and is formed in a cylindrical shape along the extending direction (axial direction) of the pipe 106. The outer cylinder 61 has a circular cross section, and the inner diameter is set larger than the outer diameter of the pipe 106 by a predetermined amount. The outer cylinder 61 is constituted by a plurality (two in the present embodiment) of divided outer cylinders 61a that are divided in the radial direction because it is necessary to be attached to the outer peripheral side of the existing pipe 106 later. The wall portion 71 is fixed with an annular mounting base 73 around the through hole 72. The outer cylinder 61 is integrally formed with an attachment flange 61 b at one end in the axial direction, and the plurality of attachment flanges 61 b are in close contact with the attachment base 73 and fixed by a plurality of bolts 74. The outer cylinder 61 covers a curved region of the pipe 106 and has a curved shape, similar to the pipe 106.

  The side lid member 62 is attached to the other end portion of the outer cylinder 61 in the extending direction, and is formed in an annular shape. The side cover member 62 has an outer diameter set to be substantially the same as the outer diameter of the outer cylinder 61, and an inner diameter set slightly larger than the outer diameter of the pipe 106. Similar to the outer cylinder 61, the side lid member 62 includes a plurality (two in this embodiment) of divided side lid members 62 a that are divided in the radial direction. The side lid member 62 contacts the other end surface of the outer cylinder 61 and is fixed by seal welding.

  The pressure receiving member 63 is attached to the other end portion of the outer cylinder 61 in the extending direction, and is formed in an annular shape. The pressure receiving member 63 has an outer diameter set to be substantially the same as the inner diameter of the outer cylinder 61, and the inner diameter is set slightly larger than the outer diameter of the pipe 106. Similar to the outer cylinder 61, the pressure receiving member 63 includes a plurality (two in this embodiment) of divided pressure receiving members 63 a that are divided in the radial direction. The pressure receiving member 63 is fixed to the inner peripheral surface of the outer cylinder 61 and one surface of the side lid member 62.

  The protrusion 64 is fixed to the outer peripheral surface of the pipe 106, protrudes radially outward from the outer peripheral surface of the pipe 106, and is formed in an annular shape. The protruding portion 64 is fixed to the other end portion in the extending direction at a predetermined portion of the pipe 106 covered with the outer cylinder 61. Similar to the outer cylinder 61 and the pressure receiving member 63, the protruding portion 64 includes a plurality (two in this embodiment) of divided protruding portions 64a that are divided in the radial direction. Specifically, the protrusion 64 is disposed on the wall 71 side of the pressure receiving member 63 on the outer peripheral surface of the pipe 106 and adjacent to the pressure receiving member 63. The protrusion 64 is set to have an inner diameter substantially the same as the outer diameter of the pipe 106, and the outer diameter is set slightly smaller than the inner diameter of the outer cylinder 61.

  In the pipe protection device 60 of the present embodiment, the side cover member 62 is fixed to the other end portion of the inner peripheral surface of the outer cylinder 61 that covers the outer periphery of the pipe 106 whose one end side is supported by the wall portion 71, and pressure is received on the inner side. While the member 63 is fixed, the protrusion 64 is fixed to the outer peripheral surface of the pipe 106 adjacent to the inner side of the pressure receiving member 63.

  And as shown in FIGS. 16-18, the manufacturing method of the piping protective cover of this embodiment overlaps the 1st flat plate material 81 with the 2nd flat plate material 82, and press-processes in the inner surface of the division | segmentation outer cylinder 61a. A step of forming the divided covers 84 and 85 where the divided pressure receiving member 63a is fixed at a predetermined position in the axial direction, and a step of abutting and fixing the circumferential ends of the two divided covers 84 and 85 together. Have.

  In this case, the first flat plate material 81 is a material of the divided outer cylinder 61a, has a fan shape with curved both sides, and has a length and a width corresponding to the divided outer cylinder 61a. The second flat plate material 82 is a material of the divided pressure receiving member 63a, has a fan shape with curved sides, and is set to have a length and width corresponding to the divided pressure receiving member 63a. Moreover, the length of the first flat plate 81 and the second flat plate 82 is set to double.

  First, as shown in FIG. 16, the second flat plate material 82 is overlapped and pressed at an intermediate portion in the longitudinal direction of the first flat plate material 81, and as shown in FIG. 17, as shown in FIG. A divided cover main body 83 is formed by fixing the divided pressure receiving member main body 82a at an axially intermediate portion on the inner surface. Next, the two divided covers 84 and 85 are formed by cutting the divided cover main body 83 along the cutting line C at an intermediate position in the axial direction. Thereafter, as shown in FIG. 15, the divided piping cover is formed by fixing the divided side cover member 62 a to the end of the divided outer cylinder 61 a to which the divided pressure receiving member 63 a of the divided covers 84 and 85 is fixed. It can be attached to the pipe 106 by abutting and fixing the circumferential ends of the two divided pipe protection covers.

  In addition, the manufacturing method of the piping protective cover of this embodiment is not limited to the procedure mentioned above. For example, the divided pressure receiving member main body 82a is fixed to the axial intermediate portion of the inner surface of the divided outer cylinder main body 81a by pressing the second flat plate 82 on the intermediate portion in the longitudinal direction of the first flat plate 81. The two divided cover main bodies 83 may be formed, and the two divided cover main bodies 83 may be overlapped in a cylindrical shape and cut at an intermediate position in the axial direction to form two sets of pipe protection covers.

  When the pipes 106 are broken, the pipes 106 try to be separated from each other starting from the broken position. That is, since one side (right side) of the pipe 106 is supported by the wall portion 71, the other side (left side) tends to move in the direction of arrow C. At this time, since the protruding portion 64 contacts and is locked to the pressure receiving member 63, the piping 106 is prevented from moving the broken piping 106. Therefore, although the fluid flows out from the broken position in the pipe 106, the fluid stays in the space covered by the outer cylinder 61 and the side lid member 62, and the ejection of the fluid to the outside of the outer cylinder 61 is suppressed. Is done. Further, since the movement of the broken pipe 106 is prevented, the pipe whip around which the broken pipe 106 swings is prevented, and the progress of the break is suppressed.

  As described above, in the manufacturing method of the pipe protection cover of the third embodiment, the second flat plate member 82 is stacked on the first flat plate member 81 and pressed, so that the intermediate portion in the axial direction on the inner surface of the divided outer cylinder main body 81a. A step of forming a divided cover main body 83 in which the divided pressure receiving member main body 82a is fixed to a portion, a step of cutting the divided cover main body 83 at an intermediate position in the axial direction to form two divided covers 84 and 85, A step of abutting and fixing the end portions in the circumferential direction of the two divided covers 84 and 85.

  Therefore, it is possible to manufacture a pipe protective cover capable of suppressing the flow of fluid around the pipe 106 and the progress of breakage of the pipe 106 at a low cost. And since the division | segmentation cover main body 83 is formed by overlapping and pressing the two flat plate materials 81 and 82, rather than pressing the 1st flat plate material 81 and the 2nd flat plate material 82 separately, press work is carried out. Since the number of times is reduced and the flat plates 81 and 82 are integrally pressed, it is possible to simplify the fixing operation between the divided outer cylinder 61a and the divided pressure receiving member 63a. Workability can be improved.

  In each of the above-described embodiments, the side lid member and the pressure receiving member (locking member) are fixed to the end portion of the outer cylinder. However, the side lid member and the pressure receiving member (locking member) are also used as the pressure receiving member ( (Locking member) only.

  In the embodiment described above, the application of the pipe protection device is illustrated as a straight pipe portion of the pipe, but the pipe protection device can also be applied to a curved portion of the pipe. The extending direction of the piping in this case refers to each direction facing after bending.

  Moreover, although the nuclear facility mentioned above demonstrated what used the pressurized water reactor (PWR: Pressurized Water Reactor), it is not this limitation. For example, although not shown in the figure, it may be a nuclear facility using a boiling water reactor (BWR), and the pipe protection device is a pipe through which steam generated in the boiling reactor passes. Can also be applied. Furthermore, the piping protection device of the present invention can be applied not only to nuclear facilities but also to any piping as long as it is a piping that transports a fluid such as gas or liquid.

10, 60 Piping protection device 11, 61 Outer cylinder 12, 13, 62 Side cover member 14, 15, 63 Pressure receiving member (locking member)
16, 17, 64 Protruding portion 21 Fixing member 22 Support member 31, 51, 81 First flat plate member 32, 52, 82 Second flat plate member 33, 53, 84, 85 Dividing cover 41 Punch (press device)
42 Dies (pressing equipment)
71 Wall (supporting member)
72 Through hole 106 Piping

Claims (7)

In a pipe protective cover in which an engaging member that is engaged with a protrusion fixed to the outer surface of the pipe to prevent movement in the axial direction is fixed to an inner surface end of an outer cylinder that covers the outer periphery of the pipe,
Forming a split outer cylinder having a semi-cylindrical shape by pressing the first flat plate;
Forming a split locking member having a semi-cylindrical shape by pressing the second flat plate; and
Fixing the division locking member at a predetermined axial position on the inner surface of the division outer cylinder to form a division cover;
A step of abutting and fixing circumferential ends of the two divided covers;
A method for manufacturing a piping protective cover, comprising: In a pipe protective cover in which an engaging member that is engaged with a protrusion fixed to the outer surface of the pipe to prevent movement in the axial direction is fixed to an inner surface end of an outer cylinder that covers the outer periphery of the pipe,
Forming a split cover in which the split locking member is fixed at a predetermined position in the axial direction on the inner surface of the split outer cylinder by pressing the second flat plate on the first flat plate; and
A step of abutting and fixing circumferential ends of the two divided covers;
A method for manufacturing a piping protective cover, comprising:   The method for manufacturing a pipe protection cover according to claim 1 or 2, wherein the divided locking member is fixed to one end and the other end in the axial direction on the inner surface of the divided outer cylinder.   The pipe protection cover according to claim 1 or 2, wherein the split engagement member is fixed to one axial end portion of the inner surface of the split outer cylinder, and a mounting flange is fixed to the other end portion. Production method.   A split cover main body by fixing the split locking member to an axial intermediate portion on the inner surface of the split outer cylinder by pressing the second flat plate on the intermediate portion in the longitudinal direction of the first flat plate. The method of manufacturing a piping protective cover according to claim 2, wherein the two divided covers are formed by cutting the divided cover main body at an axially intermediate position.   A split cover main body by fixing the split locking member to an axial intermediate portion on the inner surface of the split outer cylinder by pressing the second flat plate on the intermediate portion in the longitudinal direction of the first flat plate. The pipe protection cover manufacturing method according to claim 2, wherein two divided cover bodies are overlapped in a cylindrical shape and cut at an intermediate position in the axial direction.   The side cover member that closes the gap with the outer surface of the pipe is fixed to an end of the divided outer cylinder to which the divided locking member of the divided cover is fixed. A method for manufacturing a piping protective cover according to claim 1.

Images