JP5836160B2 - Body joining method and body - Google Patents

Description

  The present invention relates to a body joining method and a body part for joining body parts used for a steam generator or the like.

  In general, a steam generator for a nuclear reactor, which is a large structure, is configured by abutting end surfaces of a plurality of trunk portions against each other and welding them. Conventionally, as a method of joining the barrels constituting this type of pressure vessel, conventionally, after stacking a plurality of cylindrical barrels in the vertical direction, the barrels are welded together while maintaining the vertical posture. Such a method is known (see, for example, Patent Document 1). In the method described in Patent Document 1, the body portions are stacked so as to be aligned in the vertical direction.

JP 2002-267883 A

  However, in the method described in Patent Document 1, there is a possibility that a step is generated in the radial direction at the joint portion of the trunk portion when the trunk portions are stacked in the vertical direction, and the trunk portion can be joined uniformly in the circumferential direction. difficult.

  The objective of this invention is providing the trunk | drum joining method and trunk | drum which can join a trunk | drum uniformly in the circumferential direction.

  One aspect of the present invention is a body joining method for joining a first body part and a second body part constituting a container, wherein the center axis of the first body part and the center axis of the second body part are perpendicular to each other. With the positioning portion provided on the first body portion, the second body portion is positioned in the horizontal direction with respect to the first body portion, and the first body portion and the second body portion are vertically aligned. The first body portion and the second body portion are arranged on the inner peripheral surface side and the outer periphery in a state where the first body portion and the second body portion are disposed adjacent to each other in the vertical direction. Welding at any one of the joints on the surface side to temporarily join the first body and the second body, and the first body and the second body integrated by the temporary joining The first body part and the second body part are disposed adjacent to each other in the horizontal direction, and the first body part and the second body part are disposed adjacent to each other in the horizontal direction. Torso and second And a body portion by welding at the other of the junction of the inner peripheral surface side and the outer peripheral surface, characterized in that it comprises the steps of the junction with the first body portion and the second barrel portion.

  According to this configuration, with the second body portion positioned in the horizontal direction with respect to the first body portion, the first body portion and the second body portion are brought down sideways and the joint portion is finally joined. can do. For this reason, a 1st trunk | drum and a 2nd trunk | drum can be joined to the circumferential direction uniformly.

  In the trunk | body part joining method by another aspect of this invention, the process of removing a positioning part is further included.

  According to this structure, the positioning part which became unnecessary by this joining is removed. For this reason, the 1st trunk and the 2nd trunk are smoothly continued without a level difference, and can be used suitably for the steam generator etc. of a nuclear reactor.

  In the trunk | drum joining method by another aspect of this invention, the positioning part protrudes from the edge part of the 1st trunk | drum from the inner peripheral surface side or outer peripheral surface side of the 2nd trunk | drum, and a 1st trunk | drum and a 2nd trunk | drum are provided. In the step of temporarily joining the parts, the positioning part and the positioned part of the second body part facing the positioning part are welded.

  According to this configuration, by mounting the second body portion above the first body portion, the second body portion can be easily positioned with respect to the first body portion. Moreover, temporary joining of the 1st trunk | drum and 2nd trunk | drum by welding with a positioning part and a to-be-positioned part is also easy.

  In the body joining method according to another aspect of the present invention, the positioning part is provided over the circumferential direction of the first body part, and in the step of arranging the first body part and the second body part adjacent to each other in the vertical direction, positioning is performed. The first body portion and the second body portion are arranged so that the gap between the portion and the positioned portion is uniform over the circumferential direction.

  According to this structure, the 1st trunk | drum and the 2nd trunk | drum are arrange | positioned concentrically accurately, and the 1st trunk | drum and the 2nd trunk | drum can be joined to the circumferential direction uniformly.

  In the trunk | drum joining method by another aspect of this invention, a groove | channel is previously provided in either one of the inner peripheral surface side and the outer peripheral surface side of a 1st trunk | drum and a 2nd trunk | drum, a 1st trunk | drum and a 2nd trunk | drum. In the main joining process to the body part, the groove is welded.

  According to this structure, the 1st trunk | drum and the 2nd trunk | drum can be firmly joined via the groove | channel provided in the outer peripheral surface of a 1st trunk | drum and a 2nd trunk | drum. For this reason, even when the part of temporary joining is removed, necessary and sufficient joining strength can be ensured.

  In the trunk part joining method according to another aspect of the present invention, in the step of main joining the first trunk part and the second trunk part, the temporarily joined first trunk part and the second trunk part are connected to the first trunk part. While being integrally rotated about the central axis of the first and second body parts, welding is performed by a welding device provided facing the joint part.

  According to this structure, the 1st trunk | drum and 2nd trunk | drum can be main-joined, fixing the position of the welding apparatus 40, and the structure of a welding apparatus can be simplified.

  One aspect of the present invention is a body that constitutes a container, and in the state where its central axis is disposed in the vertical direction, another body that is disposed adjacent to the vertical direction is positioned in the horizontal direction. A positioning portion, a temporary joining portion that is provided on either the inner peripheral surface side or the outer peripheral surface side of the one axial end portion and temporarily joins the other body portion positioned by the positioning portion; And a main joining portion that is provided on either the inner peripheral surface side or the outer peripheral surface side and that fully joins the other body portion temporarily joined by the temporary joining portion.

  According to this configuration, the main body part and the other main body part can be brought down sideways and joined together while the other main body part is positioned in the horizontal direction with respect to the main body part. For this reason, another torso can be uniformly joined to the torso in the circumferential direction.

  In the barrel portion according to another aspect of the present invention, the positioning portion projects from the end portion of the first barrel portion toward the inner peripheral surface side or the outer peripheral surface side of the second barrel portion, and the positioning portion constitutes a temporary joint portion. To do.

  According to this structure, it is not necessary to provide a temporary joint part separately, and a structure can be simplified.

  As for the trunk | drum by another aspect of this invention, the positioning part is provided over the circumferential direction.

  According to this configuration, the other body portion can be uniformly joined to the body portion with high accuracy in the circumferential direction.

  As for the trunk | drum by another aspect of this invention, this joint part is a groove | channel.

  According to this configuration, the main bonding can be firmly performed by the groove, and then the sufficient bonding strength of the body portion can be maintained even if the temporary bonding portion is removed.

  According to the present invention, the container can be configured by uniformly joining the body portions in the circumferential direction.

FIG. 1 is a front view of a pressure vessel to which a body joining method according to an embodiment of the present invention is applied. FIG. 2 is a cross-sectional view showing a step of the body joining method according to the embodiment of the present invention. FIG. 3 is a cross-sectional view of main parts of FIG. 2 showing a main part configuration of the body part according to the embodiment of the present invention. FIG. 4 is a flowchart showing a procedure of the body joining method according to the embodiment of the present invention. FIG. 5 is a diagram for explaining a second step of the body portion joining method according to the embodiment of the present invention. FIG. 6 is a diagram for explaining a third step of the body portion joining method according to the embodiment of the present invention. FIG. 7 is a view for explaining a fourth step of the trunk portion joining method according to the embodiment of the present invention. FIG. 8 is a view showing a joined body of the first body part and the second body part obtained by the fourth step. FIG. 9 is a diagram for explaining a fifth step of the body portion joining method according to the embodiment of the present invention. FIG. 10 is a diagram showing a comparative example of the body portion joining method according to the embodiment of the present invention. FIG. 11 is a diagram showing a modification of FIG. FIG. 12 is a diagram showing another modification of FIG. FIG. 13 is a diagram showing a modification of FIG. FIG. 14 is a diagram for explaining a sixth step which is a subsequent step of FIG.

  Hereinafter, with reference to FIGS. 1-10, the trunk | body part joining method which concerns on embodiment of this invention is demonstrated. In the following, as an example, the trunk portion joining method of the present invention is applied to a pressure vessel of a steam generator used in a pressurized water reactor.

  In a pressurized water reactor, a primary coolant (primary cooling water) is sent to a steam generator as high-temperature high-pressure water that does not boil over the entire core. The steam generator transmits the heat of the high-temperature and high-pressure primary cooling water to the secondary coolant (secondary cooling water), and uses the secondary cooling water as steam. This steam is sent to the steam turbine to drive it. The output shaft of the steam turbine is connected to the input shaft of the generator, and the generator driven by the steam turbine generates electric power.

  FIG. 1 is a front view of a pressure vessel configured by applying the trunk portion joining method according to the present embodiment. FIG. 1 shows a state in which the axis L0 passing through the longitudinal center of the pressure vessel 100 is oriented in the horizontal direction, that is, a state in which the pressure vessel 100 is tilted sideways. In an actual use state in the nuclear reactor, the pressure vessel 100 is installed with the axis L0 directed in the vertical direction, that is, in a standing state. In the standing state, the left side of the figure is the upper part of the pressure vessel 100 and the right side is the lower part. The upper part becomes the steam outlet of the steam generator, and the lower part becomes the water chamber. Such a steam generator is, for example, a large cylindrical pressure vessel having a diameter of about 5 m and a total length of about 20 m and sealed inside. For this reason, it is comprised by joining the axial direction end surface of a some trunk | drum to each other by welding.

  As shown in FIG. 1, the pressure vessel 100 includes an upper hemispherical member 1, a first cylindrical member 2, a tapered member 3, a second cylindrical member 4, a third cylindrical member 5, and a fourth cylindrical member 6. And a lower hemispherical member 7. Each of these members 1 to 7 has a symmetric shape or a substantially symmetric shape with respect to the axis L0, and each of them constitutes a body portion having a cavity inside. The pressure vessel 100 is configured by welding end faces of members 1 to 7 adjacent to each other in the longitudinal direction (axis L0 direction). At this time, a sealed space SP is formed inside the pressure vessel 100. Each member 1-7 of the pressure vessel 100 is comprised, for example with low alloy steel.

  Hereinafter, among the members 1 to 7 adjacent in the longitudinal direction in the state where the pressure vessel 100 is erected, the lower member (for example, the third cylindrical member 5) is the first body portion 8 and the upper member (for example, the second member). The configuration of the joint portion 10 between the first body portion 8 and the second body portion 9 will be described using the cylindrical member 4) as the second body portion 9. In addition, the structure of the junction part 10 of each member 1-7 is mutually equal.

  FIG. 2 is a cross-sectional view showing one process of the body joining method according to the present embodiment. FIG. 3 is a cross-sectional view of the main part of FIG. 2 (enlarged view of part III) showing the structure of the main part of the body according to the present embodiment. 2 and 3 show a state before welding in which the second body portion 9 is mounted above the first body portion 8. In this state, the axis L1 passing through the center of the first body 8 and the axis L2 passing through the center of the second body 9 are each directed in the vertical direction. In the following, the vertical direction is defined as shown in FIGS. 2 and 3 in accordance with the actual use state of the pressure vessel 100, and the configuration of each part will be described according to this definition.

  As shown in FIGS. 2 and 3, the first body portion 8 and the second body portion 9 are respectively provided on the body portion main body 11 constituting the cylindrical peripheral wall and the upper and lower end portions of the outer peripheral surface of each body portion main body 11. The groove 12 is provided, and the positioning portion 20 is provided at the upper end on the inner peripheral surface side of the trunk body 11. In FIG. 2, the illustration of the positioning portion 20 in the joint portion 10 is partially omitted. The lower end portion of the second body portion 9 constitutes a positioned portion 16 corresponding to the positioning portion 20. The positioning unit 20 regulates the radial position of the positioned unit 16.

  The plate | board thickness of the trunk | drum main body 11 (1st trunk | drum main body 11A) of the 1st trunk | drum 8 and the plate | board thickness of the trunk | drum main body 11 (2nd trunk | drum main body 11B) of the 2nd trunk | drum 9 are the longitudinal direction and the circumferential direction. And the thicknesses of the first body portion main body 11A and the second body portion main body 11B are equal to each other. The groove 12 is a so-called U groove having a U-shape, and is provided over the entire circumference of the outer peripheral surface of each of the trunk main bodies 11A and 11B. The groove 12 is provided only at the lower end portion of the upper hemispherical member 1 in FIG. 1 and only at the upper end portion of the lower hemispherical member 7.

  As shown in FIG. 2, the upper end surface 13 of the first body portion main body 11A and the lower end surface 14 of the second body portion main body 11B are planes orthogonal to the axes L1 and L2, respectively. These upper and lower end surfaces 13 and 14 are in contact with each other on the radially inner side of the groove 12.

  As shown in FIG. 3, the positioning portion 20 protrudes from the upper end portion of the first body main body 11A to the radially inner side of the second body main body 11B. That is, the positioning part 20 includes a first convex part 21 projecting in a radial direction from an inner peripheral surface of the upper end part of the first body part 11A and a second convex part 22 projecting upward from the upper end face 25 of the first convex part 21. The cross-sectional shape is L-shaped or substantially L-shaped. The positioning portion 20 is provided in a ring shape over the entire circumference on the radially inner side of the first body portion main body 11A, and the outer peripheral surface 23 and the inner peripheral surface 24 of the second convex portion 22 each form a cylindrical surface. In addition, the same positioning part 20 is provided also in the upper end part of the 2nd trunk | drum main body 11B.

  The upper end surface 25 of the first convex portion 21 is a plane that is connected to the upper end surface 13 of the body main body 11 and is orthogonal to the axis L1 (FIG. 2). A lower end portion on the radially inner side of the first convex portion 21 is chamfered in a tapered shape, and a chamfered portion 26 is formed. The outer peripheral surface 23 of the second convex portion 22 is located radially inward of the inner peripheral surface 15 of the second trunk portion main body 11B, and the outer peripheral surface 23 of the second convex portion 22 and the inner periphery of the second trunk portion main body 11B. A gap t <b> 0 is provided in the radial direction between the surface 15. The upper end surface 27 of the second convex portion 22 is a plane orthogonal to the axis L1. A corner portion where the upper end surface 27 and the outer peripheral surface 23 intersect is chamfered in a tapered shape to form a chamfered portion 28.

  The positioning part 20 of the first body part 8 is for regulating the radial position of the positioned part 16 of the second body part 9, and the second body part 9 with respect to the first body part 8 by the positioning part 20. Is positioned. As will be described later, the positioning portion 20 holds the positioned portion 16 of the second barrel portion 9 when the first barrel portion 8 and the second barrel portion 9 are integrated and tilted sideways. Considering this point, the shape of the positioning portion 20 (the thickness of the first convex portion 21 and the second convex portion 22, the amount of chamfering of the chamfered portion 26, etc.) is determined so that the second body portion 9 can be sufficiently held. ing.

  The 1st trunk | drum 8 and the 2nd trunk | drum 9 comprised as mentioned above are joined in the following procedures. FIG. 4 is a flowchart showing a procedure of the body portion joining method according to the present embodiment. In this body portion joining method, the first body portion 9 is positioned and arranged above the first body portion 8 (step S1), and the first body portion 8 and the second body portion 9 are welded. A second step (step S2) for temporary joining, a third step (step S3) for placing the first body portion 8 and the second body portion 9 integrated by temporary joining sideways, It has the 4th process (step S4) which carries out the main joining of the trunk | drum 8 and the 2nd trunk | drum 9 by welding, and the 5th process (step S5) which finishes the surface of the junction part 10. FIG. Hereinafter, each process will be described in detail.

(1) First Step As the first step, first, the first body portion 8 is placed on the floor surface or on the assembly table in such a posture that the axis L1 faces the vertical direction and the positioning portion 20 faces upward. To place. Next, the second body portion 9 is lifted by a crane or the like, and is lowered toward the first body portion 8 in such a posture that its axis L2 is oriented in the vertical direction and the positioned portion 16 is directed downward. As a result, as shown in FIG. 3, the second body portion 9 is mounted above the first body portion 8, and the first body portion 8 and the second body portion 9 are disposed adjacent to each other in the vertical direction. When the second body part 9 is lowered, the positioning part 20 regulates the radial position of the positioned 16 so that the second body part 9 can be easily aligned with the first body part 8.

  In this first step, the gap t0 between the outer peripheral surface 23 of the second convex portion 22 and the inner peripheral surface 15 of the second body portion 9, that is, the radial direction between the positioning portion 20 and the positioned portion 16 is set. The position of the second body portion 9 is adjusted so that the gap t0 is constant over the entire circumference. As a result, the axis L1 of the first body 8 and the axis L2 of the second body 9 coincide with each other with high precision, and the outer peripheral surface of the first body main body 11A and the outer peripheral surface of the second body main body 11B. It is possible to prevent a step from occurring between the two. The variation in the gap t0 in the circumferential direction can be easily confirmed by, for example, inserting gauges having a predetermined thickness into the gap t0 at a constant pitch in the circumferential direction (for example, every 45 degrees).

(2) Second Step When the first step is finished, as the second step, the second convex portion is formed by, for example, covering arc welding with the first barrel portion 8 and the second barrel portion 9 arranged adjacent to each other in the vertical direction. The upper end part of the part 22 and the inner peripheral surface 15 of the second body part 11B are welded. That is, the positioning part 20 of the first body part 8 and the positioned part 16 of the second body part 9 are temporarily joined to form a temporarily joined body 50 (FIG. 6). Drawing 5 is a figure explaining the 2nd process, and has shown the weld bead shape after temporary joining. As shown in FIG. 5, since the chamfered portion 28 is formed at the upper end portion of the second convex portion 22, the weld metal 17 is below the upper end surface 27 of the second convex portion 22 along the chamfered portion 28. Get in. For this reason, a welding range increases and sufficient temporary joining intensity | strength of the positioning part 20 and the to-be-positioned part 16 can be acquired.

  In this case, the bonding strength may be a strength that can maintain both of the first body portion 8 and the second body portion 9 in the next step when the first body portion 8 and the second body portion 9 are tilted sideways. For this reason, it is not necessary to weld the entire circumference of the positioning portion 20, and in this embodiment, the positioning portion 20 and the positioned portion 16 are welded at a predetermined welding pitch in the circumferential direction. That is, the 2nd convex part 22 and the inner peripheral surface 15 of the 2nd trunk | drum main body 11B are welded at the circumferential direction equal intervals. The welding pitch is determined in consideration of the diameter and weight of the trunk body 11. In the second step, preheating and afterheating are performed in order to prevent cold cracking of the welded portion. After the temporary joining, the surface is smoothly finished with a grinder or the like as necessary in order to reduce the stress concentration in the welded portion.

(3) Third Step When the second step is completed, as the third step, the trunk portions 8 and 9 (temporary joined body 50) integrated by temporary joining are tilted sideways using a crane or the like. FIG. 6 is a diagram for explaining the third step. As shown in FIG. 6, in the third step, the body portions 8 and 9 are placed sideways on the support base 30. In this case, since the positioning part 20 of the first body part 8 and the positioned part 16 of the second body part 9 are temporarily joined in the previous step, the first body part 8 and the second body part 9 are concentric. The body portions 8 and 9 can be arranged adjacent to each other in the horizontal direction while maintaining the above. In the state where the trunk portions 8 and 9 are tilted sideways, the axis lines L1 and L2 are respectively positioned on the axis line L3 of the temporary joined body 50 extending in the horizontal direction. The support base 30 has a support mechanism that rotatably supports the temporary joined body 50 about the axis L3.

(4) Fourth Step When the third step is completed, as the fourth step, the outer peripheral surfaces of the barrels 8 and 9 with the first barrel 8 and the second barrel 9 disposed adjacent to each other in the horizontal direction. The groove 12 is welded. That is, the first body portion 8 and the second body portion 9 are finally joined. FIG. 7 is a diagram for explaining the fourth step. As shown in FIG. 7, in the fourth step, the welding device 40 is disposed above the trunk portions 8 and 9 so as to face the groove 12. The welding device 40 is supported by a support portion 41 provided away from the body portions 8 and 9, and the temporary joined body 50 is supported around the axis L3 in a state where the position of the welding device 40 is fixed. The top can be rotated.

  The welding device 40 is a submerged arc welding machine that performs, for example, submerged arc welding, and welds the first body portion 8 and the second body portion 9 along the groove 12 while dispersing the flux 18 in the groove 12. To do. In this case, by rotating the temporary joined body 50 around the axis L3 in the direction of the arrow, it is possible to easily perform the entire circumference welding of the groove 12 while fixing the position of the welding device 40. Further, since the first body portion 8 and the second body portion 9 are preliminarily concentrically joined in advance, there is a circumference between the outer peripheral surface of the first body portion main body 11A and the outer peripheral surface of the second body portion main body 11B. The first body portion 8 and the second body portion 9 can be welded uniformly in the circumferential direction without causing unevenness in the direction. In addition, also in a 4th process, the pre-heating and post-heating of the junction part 10 are performed, and after welding, the surface is smoothly finished with a grinder or the like as necessary. The post-heating in the fourth step can be omitted. That is, the post-heating is performed in order to interrupt the pre-heating (reducing the temperature of the body parts 8 and 9 to room temperature) in the case where time is required until the heat treatment in the post-process. Therefore, for example, when heat treatment is performed with preheating, post-heating is omitted.

  FIG. 8 is a view showing a joined body of the first body portion 8 and the second body portion 9 obtained by the fourth step, that is, the present joined body 60. In the main assembly 60, the weld metal 19 is melted over the entire circumference of the groove 12, and the first body portion 8 and the second body portion 9 are firmly joined.

(5) Fifth Step When the fourth step is completed, as a fifth step, the positioning portion 20 and the weld metal 17 that protrude from the inner peripheral surfaces of the first body main body 11A and the second body main body 11B are removed. FIG. 9 is a diagram for explaining the fifth step. In the figure, the dotted line is a portion removed by a grinder or the like. Since the positioning portion 20 is provided with the chamfered portion 26, the volume of the removed portion in the fifth step is small, and the removal operation of the positioning portion 20 is easy.

  In the fifth step, as shown in FIG. 9, by removing the positioning portion 20 and the weld metal 17 that are no longer required by the main joining, the inner peripheral surface of the first body main body 11A and the second body main body 11B are removed. The inner peripheral surface can be continued with a smooth curved surface without any step. Thereby, the trunk | drum 8 and 9 can be used suitably as the pressure vessel 100 of a steam generator.

  When the first to fifth steps are completed, the joined body 60 is placed in a posture such that the axis L3 faces the vertical direction, and the other trunks are stacked on the trunks 8 and 9. Then, other body parts are joined to the body parts 8 and 9 in the same manner as described above. By repeating this, the pressure vessel 100 is completed.

According to this embodiment, the following effects can be obtained.
(1) When joining the 1st trunk | drum 8 and the 2nd trunk | drum 9, first, as a 1st process, the axis line L1 of the 1st trunk | drum 8 and the axis line L2 of the 2nd trunk | drum 9 are each turned to the perpendicular direction, respectively. In this state, the first barrel 8 and the second barrel are positioned in the radial direction with respect to the first barrel 8 by the positioning portion 20 provided in the first barrel 8 in advance. 9 are arranged adjacent to each other in the vertical direction. Next, as a second step, the positioning portion 20 of the first body portion 8 and the position of the second body portion 9 are positioned in a state where the first body portion 8 and the second body portion 9 are disposed adjacent to each other in the vertical direction. The first body 8 and the second body 9 are temporarily joined by welding the part 16. Next, the 1st trunk | drum 8 and the 2nd trunk | drum 9 (temporary joined body 50) which were integrated by temporary joining are turned down horizontally, and the 1st trunk | drum 8 and the 2nd trunk | drum 9 are adjacent to a horizontal direction. And place it. Next, as a fourth step, with the first body portion 8 and the second body portion 9 disposed adjacent to each other in the horizontal direction, the first body portion 8 and the second body portion 9 are grooved on the outer peripheral surface. 12, the first body portion 8 and the second body portion 9 are finally joined. Finally, as a fifth step, the positioning unit 20 is removed.

  By adopting such a joining method, with the second barrel 9 positioned with respect to the first barrel 8, the barrels 8 and 9 are tilted sideways together and the groove is welded by the welding device 40. 12 can be welded over the entire circumference. For this reason, it is possible to prevent unevenness in the circumferential direction from occurring at the joint portion of the body portions 8 and 9, and to join the body portions 8 and 9 uniformly in the circumferential direction. Moreover, it is not necessary to use a large welding facility, and an increase in manufacturing cost can be suppressed. That is, when welding a groove in a state where the body portions are stacked upward, it is necessary to install a welding apparatus at a high place, so that the welding equipment is increased in size. On the other hand, when welding the groove | channel 12 in the state which laid down the trunk | drum 8 and 9 like this embodiment, the enlargement of welding equipment can be prevented.

  FIG. 10 is a diagram showing a comparative example of the present embodiment (FIG. 5). In FIG. 10, after forming the build-up parts 71 and 72 on the surfaces of the body parts 8 and 9, respectively, one end of the connection plate 70 is welded to the build-up part 71 via the contact plate 73. The other end is welded to the built-up portion 72 via the contact plate 74. Further, a connecting plate 70 is provided at the joint portion 10 between the first body portion 8 and the second body portion 9, and the body portions 8 and 9 are temporarily joined via the connection plate 70. Thus, the method of temporarily joining using the connection board 70 has a complicated operation process. In this respect, in the present embodiment, the body parts 8 and 9 are temporarily joined in a state where the second body part 9 is positioned and mounted above the first body part 8, so that the built-up parts 71 and 72 in FIG. The contact plates 73 and 74 and the connecting plate 70 are unnecessary, and the temporary joining process is easy.

(2) Since the positioning part 20 protrudes from the upper end part of the first body part 8 to the inner side of the inner peripheral surface of the second body part 9, the second part is located above the first body part 8 in the first step. When the trunk portion 9 is mounted, the second trunk portion 9 can be easily positioned. Moreover, since the positioning part 20 and the to-be-positioned part 16 of the inner peripheral surface 15 of the 2nd trunk | drum 9 are welded, the temporary joining of the trunk | drums 8 and 9 is also easy.
(3) The positioning part 20 is provided in the upper end part of the 1st trunk | drum 8 over the circumferential direction, and the clearance gap t0 between the positioning part 20 and the internal peripheral surface 15 of the 2nd trunk | drum 9 which opposes this in a 1st process. The first body portion 8 and the second body portion 9 are arranged so as to be uniform over the circumferential direction. Thereby, the 1st trunk | drum 8 and the 2nd trunk | drum 9 can be joined concentrically with sufficient precision.
(4) In the fourth step, since the groove 12 provided in advance on the outer peripheral surfaces of the first body portion 8 and the second body portion 9 is welded, the body portions 8 and 9 can be firmly joined. For this reason, even when the positioning part 20 is removed in the fifth step, a necessary and sufficient bonding strength can be ensured.
(5) In the fourth step, the groove 12 is welded by the welding device 40 provided facing the groove 12 while rotating the temporary joined body 50 of the body portions 8 and 9 around the axis L3. did. Thereby, the trunk | drum 8 and 9 can be main-joined, fixing the position of the welding apparatus 40, and the structure of the welding apparatus 40 containing the support part 41 can be simplified.

(6) Since the positioning portion 20 protruding upward is provided at the upper end portion of the first body portion 8, the second body portion 9 can be easily mounted above the first body portion 8. The first body 8 and the second body 9 can be temporarily joined uniformly in the circumferential direction.
(7) Since the body parts 8 and 9 are temporarily joined by the positioning part 20, it is not necessary to provide the temporary joining part separately from the positioning part 20, and the configuration can be simplified.
(8) Since the positioning portion 20 is provided over the entire circumference of the upper end portion of the first body portion 8, the rigidity of the positioning portion 20 is increased, and when the body portions 8 and 9 are tilted sideways, 9 can be stably maintained.
(9) Since the positioning portion 20 is provided inside the groove 12 of the trunk portion 8, the cross section of the groove 12 portion is reinforced by the positioning portion 20, and the groove 12 can be formed deeper accordingly. .

(Modification)
In the above embodiment (FIG. 5), the positioning unit 20 is provided at the upper end of the trunks 8 and 9, and the trunk is configured to have a cylindrical peripheral wall. As long as 9 is positioned and temporarily joined, the configuration of the body portion is not limited to that described above. For example, the pressure vessel 100 may be configured with the body portions 8 and 9 having a rectangular frame shape. Although the trunk portion has a cylindrical shape, it is not limited to the cylindrical shape, and for example, a plate member having a plurality of openings may be used as the trunk portion. Specifically, the fourth cylindrical member 6 in FIG. 1 may be configured as a disc (so-called tube plate) having a plurality of openings. That is, as long as it constitutes a container, the shape of the trunk may be any.

  The configuration of the positioning unit 20 is not limited to that described above. 11 and 12 are diagrams showing another configuration of the positioning unit 20. In FIG. 11, the chamfered portion 28 of FIG. 5 is not provided at the upper corner portion of the second convex portion 22. Thereby, processing of positioning part 20 becomes easy. In FIG. 12, the chamfered portion 28 at the upper end corner of the second convex portion 22 has a downwardly convex parabolic shape. This facilitates the penetration of the weld metal 17. As long as the lower end portions of the body portions 8 and 9 have a shape corresponding to the positioning portion 20, the shape of the positioned portion 16 is not limited to that described above.

  In the above embodiment (FIG. 2), the positioning portion 20 is provided from the upper end portion of the first barrel portion 8 to the inner peripheral surface side of the second barrel portion 9, but the positioning is performed toward the outer peripheral surface side of the second barrel portion 8. The unit 20 may be provided. In other words, if the second body portion 9 is positioned in the horizontal direction with respect to the first body portion 8 and the body portions 8 and 9 are disposed adjacent to each other in the vertical direction, the positioning portion 20 is arranged on the inner peripheral surface side and the outer peripheral surface. It may be provided on either side. When the positioning portion 20 is provided on the outer peripheral surface side, the positioning portion 20 and the outer peripheral surface of the second body main body 11B may be joined. In this case, the main joining surface is provided on the inner peripheral surface side of the joint portion 10. A groove 12 may be provided. In the said embodiment, although the groove | channel 12 of the junction part 10 was made into the U-shaped groove | channel, the groove shape as this junction part is not restricted to this.

  In the embodiment (FIG. 5), the positioning portion 20 and the positioned portion 16 are welded. That is, the positioning unit 20 is configured as a temporary bonding unit, but the positioning unit 20 is configured for positioning only, and a temporary bonding unit is provided in addition to the positioning unit 20 to temporarily bond the first body unit 8 and the second body unit 9. You may make it do. In the above embodiment, the positioning unit 20 is configured in a ring shape, but the positioning unit 20 may be provided at equal intervals in the circumferential direction without being provided over the entire circumference. When welding the positioning part 20 and the to-be-positioned part 16 with the circumferential direction predetermined pitch, you may make it provide the positioning part 20 only in the welding position.

  In the above embodiment (FIG. 3), the positioning unit 20 and the positioned part 16 are configured so as to provide the cylindrical gap t0 between the positioning part 20 and the positioned part 16, but without providing the gap t0. The positioning unit 20 and the positioned unit 16 may be configured. For example, when the upper surface 13 of the first body portion 8 and the lower end surface 14 of the second body portion 9 are respectively provided with taper surfaces, and the second body portion 9 is mounted on the first body portion 8, the tapered surfaces contact each other. You may make it contact.

  In the above embodiment (FIG. 2), the positioning portion 20 is provided at the upper end portion of the body portions 8 and 9, and the positioned portion 16 is provided at the lower end portion. You may make it provide the positioning part 20 in a lower end part, and the to-be-positioned part 16 in an upper end part, respectively.

  In the above embodiment (FIG. 7), the temporarily joined body parts 8 and 9 are tilted sideways and supported on the support base 30 so as to be rotatable. However, the body parts 8 and 9 are supported so as not to rotate. Also good. In this case, the welding device 40 may be movable, and the first body portion 8 and the second body portion 9 may be welded while the welding device moves around the joint portion 10.

  In the said embodiment, after joining the trunk | drums 8 and 9 by the 1st process-the 5th process, the 1st process-the 5th process were repeated, and it was made to join another trunk | drum. The procedure for joining the parts is not limited to this. For example, the third step to the fifth step may be performed after the second step is continuously performed and all the body portions are temporarily joined. After performing the first to fourth steps for all the body parts, the fifth step may be performed collectively. If the positioning unit 20 is provided on the outer peripheral surface side and the positioning unit 20 does not need to be removed, the fifth step may be omitted.

  In the above embodiment, as the fifth step, the positioning portion 20 on the inner peripheral surfaces of the first body main body 11A and the second body main body 11B is removed (FIG. 9). It is not restricted to what was mentioned above. For example, as shown in FIG. 13, the inner peripheral surfaces of the first body main body 11 </ b> A and the second body main body 11 </ b> B may be removed in a concave shape beyond the positioning portion 20 to form a recess 51. After the recess 51 (removal part) is formed in this way, as a sixth step, as shown in FIG. 14, the recess 51 is subjected to submerged arc welding or covering arc welding, and the recess 51 is filled with the weld metal 52. May be. In this way, the removal portion may be main-welded to complete the joint.

  In the above embodiment, the trunk joining method and the trunk are applied to the steam generator of the nuclear reactor. However, the trunk joining method and the trunk of the present invention can be applied to other large pressure vessels as well. it can. The trunk | drum joining method and trunk | drum of this invention are applicable also to containers other than a pressure vessel.

  The above description is merely an example, and the present invention is not limited to the above-described embodiments and modifications unless the characteristics of the present invention are impaired. The constituent elements of the embodiment and the modified examples include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. That is, other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. Moreover, it is also possible to arbitrarily combine one or more of the above-described embodiments and modified examples.

8 First barrel portion 9 Second barrel portion 10 Joint portion 11A First barrel body 11B Second barrel body 12 Groove 15 Inner circumferential surface 16 Positioned portion 20 Positioning portion 21 First convex portion 22 Second convex portion 23 Outer peripheral surface 30 Support base 40 Welding device 50 Temporary joined body 60 Main joined body 100 Pressure vessel L1, L2 Axis t0 Gap

Claims (10)

A body joining method for joining the first body and the second body constituting the container,
With the center axis of the first body part and the center axis of the second body part oriented in the vertical direction, the positioning part provided on the first body part causes the first body part to be Positioning the two body parts in the horizontal direction and arranging the first body part and the second body part adjacent to each other in the vertical direction;
In a state where the first body part and the second body part are arranged adjacent to each other in the vertical direction, the first body part and the second body part are either one of the inner peripheral surface side and the outer peripheral surface side. Welding at the joint of the first body and temporarily joining the first body and the second body,
Laying down the first body part and the second body part that are integrated by temporary joining side by side, and arranging the first body part and the second body part adjacent to each other in the horizontal direction;
In a state where the first body portion and the second body portion are arranged adjacent to each other in the horizontal direction, the first body portion and the second body portion are either the inner peripheral surface side or the outer peripheral surface side. And a step of welding the first body part and the second body part to each other by welding at the joint part. The trunk | drum joining method of Claim 1 WHEREIN:
Furthermore, the trunk | drum joining method characterized by including the process of removing the said positioning part. The trunk | drum joining method of Claim 1 or 2 WHEREIN:
The positioning portion protrudes from an end portion of the first body portion to an inner peripheral surface side or an outer peripheral surface side of the second body portion,
In the step of temporarily joining the first body part and the second body part, the body part joining is characterized in that the positioning part and the positioned part of the second body part facing the positioning part are welded. Method. In the trunk | drum joining method of Claim 3,
The positioning part is provided over the circumferential direction of the first body part,
In the step of arranging the first body part and the second body part adjacent to each other in the vertical direction, the first body is configured so that a gap between the positioning part and the positioned part is uniform in the circumferential direction. A body part joining method, wherein the body part and the second body part are disposed. In the trunk | drum joining method of any one of Claims 1-4,
A groove is provided in advance on either the inner peripheral surface side or the outer peripheral surface side of the first body portion and the second body portion,
In the main joining step of the first body part and the second body part, the groove is welded. In the trunk | drum joining method of any one of Claims 1-5,
In the step of main joining the first body part and the second body part, the temporarily joined first body part and the second body part are connected to the central axes of the first body part and the second body part. A body part joining method comprising: welding with a welding device provided opposite to the joining part while rotating integrally around the body. A torso constituting a container,
A first barrel portion and a second barrel portion that are cylindrically adjacent to each other in the axial direction;
A positioning portion that is provided at an end portion in the axial direction of the first body portion or the second body portion and positions the first body portion and the second body portion in a radial direction ;
The first body and the second body , which are provided on either the inner peripheral surface side or the outer peripheral surface side of the axial end of the first body portion and the second body portion, and are positioned by the positioning portion . A temporary joining portion in which the body portion is temporarily joined ;
The first body portion provided on either the inner peripheral surface side or the outer peripheral surface side of the end portion in the axial direction of the first body portion and the second body portion, and temporarily joined by the temporary joint portion; A body part comprising a main joint part to which the second body part is finally joined . The torso of claim 7,
The positioning portion protrudes from an end portion of the first body portion to an inner peripheral surface side or an outer peripheral surface side of the second body portion, and the temporary joining portion is configured by the positioning portion. Torso.
In the trunk | drum of Claim 8,
The body is characterized in that the positioning part is provided in the circumferential direction. In the trunk | drum of any one of Claims 7-9,
The main joint is a groove, characterized in that it is a groove.

Images