JP2014047994A - Clearance expansion jig for heat transfer pipe and method for arranging vibration suppression member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clearance expansion jig for heat transfer pipe used for appropriately inserting a vibration suppression member in a clearance between the adjoining heat transfer pipes and a method for arranging the vibration suppression member under application of this clearance expansion jig.SOLUTION: This invention relates to a clearance expansion jig 80 for a heat transfer pipe so as to insert a vibration suppression member for suppressing vibration of the heat transfer pipe into a clearance between the adjoining heat transfer pipes 5, it includes a jig main body 81 to be inserted into the clearance, the jig main body 81 extends in a longer direction, its long direction is applied as an axial direction and rotatable, it has a short side of short outside size and a long side of long outer size, the short side is shorter than a length of the clearance in a direction where the adjoining heat transfer pipes 5 are oppositely faced to each other and the long side is longer than a length of the clearance in a direction where the adjoining heat transfer pipes 5 are oppositely faced to each other.

Description

  The present invention relates to a heat transfer tube gap expanding jig for expanding a gap between adjacent heat transfer tubes, and a method for arranging a vibration suppressing member using the same.

  Conventionally, a steam generator in which a plurality of heat transfer tubes are provided is known (for example, see Patent Document 1). Each heat transfer tube provided in the steam generator is formed in a U shape, and a fluid such as a coolant circulates inside the heat transfer tube. When the fluid flows through the inside of the heat transfer tube, vibration (fluid excitation vibration) due to the flow of the fluid occurs in the arc portion of the U-shaped heat transfer tube. For this reason, a steadying metal fitting as a vibration suppressing member is inserted into the gap between the heat transfer tubes serving as arc portions in the steam generator.

  Here, the steady rest described in Patent Literature 1 extends the gaps between the plurality of heat transfer tubes. In other words, the steady rest metal fitting is inserted into the gap between the heat transfer tubes, and then the width of the steady rest fitting is slightly wider than the gap between the heat transfer tubes so as to be in contact with the heat transfer tube.

JP 61-291896 A

  On the other hand, a rod-shaped member may be used as a vibration suppressing member to be additionally provided. In this case, in order to bring the vibration suppressing member into contact with the heat transfer tube, it is preferable to insert a vibration suppressing member having substantially the same thickness as the gap between the heat transfer tubes. However, the gaps of the heat transfer tubes are not necessarily constant due to dimensional tolerances due to variations in the flatness of the heat transfer tubes in the arc portion. Here, the heat transfer tube flattening amount means a difference between the maximum outer diameter and the minimum outer diameter in one cross section orthogonal to the longitudinal direction of the heat transfer tube. For this reason, the gap between the heat transfer tubes may be narrower than the thickness of the vibration suppression member. In this case, it is difficult to insert the vibration suppression member into the gap between the heat transfer tubes.

  Therefore, the present invention provides a gap expansion jig for a heat transfer tube used for suitably inserting a vibration suppression member into a gap between adjacent heat transfer tubes, and a method for arranging the vibration suppression member using the gap expansion jig. The issue is to provide.

  A gap expansion jig for a heat transfer tube of the present invention is a gap expansion jig for a heat transfer pipe that expands a gap in order to insert a vibration suppressing member that suppresses vibration of the heat transfer pipe into a gap between adjacent heat transfer tubes. The jig body is inserted into the gap, and the jig body extends in the longitudinal direction and is rotatable about the longitudinal direction as an axial direction. It has a short short part and a long part with a long outside dimension, the length of the short part is shorter than the length of the gap in the direction in which the adjacent heat transfer tubes face each other, and the length of the long part is the adjacent heat transfer tube Is longer than the length of the gap in the facing direction.

  According to this configuration, the jig main body is inserted so that the short portion of the jig main body is in the direction in which the heat transfer tube faces the gap between the heat transfer tubes, and then the long portion of the jig main body is By rotating the heat transfer tubes so as to face each other, the gap between the heat transfer tubes can be expanded. In this state, since the vibration suppressing member can be inserted into the gap between the heat transfer tubes, the vibration suppressing member can be preferably inserted.

  In this case, the jig body has a rectangular cross section orthogonal to the longitudinal direction, the length of the short portion is the length of the short side of the rectangle, and the length of the long portion is the length of the long side of the rectangle The length is preferred.

  According to this configuration, when rotating the jig body, in the direction in which the heat transfer tubes face each other, the jig body moves from the length at the short side of the rectangle to the length at the diagonal of the rectangle, and at the long side of the rectangle. Move to length. For this reason, the gap between the heat transfer tubes is expanded so as to be the largest in the diagonal line of the rectangular shape of the jig body, and then is slightly narrowed along the long side of the rectangular shape of the jig body. Therefore, in the direction in which the heat transfer tubes are opposed, the jig body having a length on the long side of the rectangle functions as a stopper in the rectangular diagonal line of the jig body, so that the rotation of the jig body is difficult to return. can do.

  In this case, it is preferable that the corner | angular part in the rectangle of the cross section orthogonal to a longitudinal direction is a curved surface.

  According to this configuration, the jig body can be rotated without damaging the heat transfer tube.

  In this case, it is preferable that the length of the long portion is longer than that of the vibration suppressing member in a direction in which adjacent heat transfer tubes face each other.

  According to this configuration, the vibration suppressing member can be suitably inserted into the gap between the heat transfer tubes expanded by the jig body.

  In this case, it is preferable to further include an operation member that is attached to one end of the jig body in the longitudinal direction and that operates the jig body.

  According to this configuration, the operation member can be operated to insert the jig main body into the gap between the heat transfer tubes, or to rotate the jig main body. For this reason, a jig | tool main body can be handled suitably.

  In this case, it is preferable to further include a pair of sheet members provided between the jig body and the heat transfer tubes on both sides of the jig body.

  According to this configuration, since the heat transfer tube can be protected by the pair of sheet members, the jig body can be rotated without damaging the heat transfer tube.

  In this case, it is preferable to further include a connection mechanism that connects the jig main body and the pair of sheet members.

  According to this configuration, since the jig main body and the pair of sheet members can be connected by the connection mechanism, the jig main body and the pair of sheet members can be handled as one body without scattering.

  In this case, the pair of sheet members are formed with locking grooves for locking the jig main body, and the jig main body is locked to the pair of sheet members, respectively. It is preferable to rotate by moving.

  According to this configuration, the jig body can be easily rotated by moving the pair of sheet members while protecting the heat transfer tubes with the pair of sheet members.

  In this case, it is preferable to further include a rotation assist mechanism that assists the rotation of the jig body.

  According to this configuration, since the rotation of the jig body can be assisted by the rotation assist mechanism, the jig body can be easily rotated.

  In this case, the rotation assist mechanism is engaged with the pair of pressing members provided on both sides of the jig main body and the pair of pressing members in a direction orthogonal to the direction in which the adjacent heat transfer tubes face each other, and the jig A fastening member that fastens the pair of pressing members against the main body, and the pair of pressing members are fastened by the fastening member to rotate while pressing the jig main body. Is preferred.

  According to this configuration, the jig body can be rotated by pressing the pair of pressing members from both sides of the jig body by the fastening member, so that the jig body can be easily rotated with a simple configuration. Can do.

  The vibration suppressing member disposing method of the present invention is a vibration in which a vibration suppressing member for suppressing vibration of a heat transfer tube is disposed in a gap between adjacent heat transfer tubes using the gap expansion jig of the heat transfer tube. A method for disposing a restraining member, wherein a jig insertion step of inserting a jig body such that a short portion is in a direction in which the heat transfer tube faces the gap of the heat transfer tube, and a gap of the heat transfer tube Then, the jig body is rotated so that the long portion is in the direction in which the heat transfer tubes face each other, the gap expanding process for expanding the gap, the member inserting process for inserting the vibration suppressing member into the expanded gap, and the gap expanding And a jig extracting step of extracting the jig from the gap.

  According to this configuration, the gap expansion jig can be rotated to expand the gap between the heat transfer tubes, so that the vibration suppressing member can be inserted into the gap between the expanded heat transfer tubes. For this reason, a vibration suppression member can be inserted suitably.

  In this case, before the jig pulling-out step, the extension releasing step of releasing the gap by rotating the jig body so that the short portion is in the direction facing the heat transfer tube with respect to the gap of the heat transfer tube. It is preferable to further comprise.

  According to this configuration, the gap expanding jig can be rotated to release the expansion of the gap of the heat transfer tube, so that the gap expanding jig can be easily pulled out in the jig pulling process.

FIG. 1 is a schematic side sectional view of a steam generator in which the gap extending jig of Example 1 is used. FIG. 2 is a schematic plan view of the heat transfer tube group. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic perspective view of the heat transfer tube group. FIG. 5 is an axial sectional view of the heat transfer tube group in the center plane. FIG. 6 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the first embodiment. FIG. 7 is an explanatory diagram of an example relating to a method of arranging a vibration suppressing member using the gap extending jig of the first embodiment. FIG. 8 is an explanatory diagram of an example regarding a method for arranging a vibration suppressing member using the gap extending jig of the first embodiment. FIG. 9 is an explanatory diagram of an example related to a method of arranging a vibration suppressing member using the gap extending jig of the first embodiment. FIG. 10 is an explanatory diagram of an example relating to a method of arranging a vibration suppressing member using the gap extending jig of the first embodiment. FIG. 11 is an explanatory diagram of an example related to a method of arranging a vibration suppressing member using the gap extending jig of the first embodiment. FIG. 12 is an explanatory diagram of an example relating to a method of arranging a vibration suppressing member using the gap extending jig of the first embodiment. FIG. 13 is a flowchart regarding a method of arranging the vibration suppressing member. FIG. 14 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the second embodiment. FIG. 15 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the third embodiment. FIG. 16 is an explanatory diagram of an example regarding a method of arranging a vibration suppressing member using the gap extending jig of the third embodiment. FIG. 17 is an explanatory diagram of an example regarding a method for arranging a vibration suppressing member using the gap extending jig of the third embodiment. FIG. 18 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the fourth embodiment. FIG. 19 is a schematic configuration diagram illustrating an outline of a gap extending jig according to the fifth embodiment. FIG. 20 is an explanatory diagram of an example regarding a method of arranging a vibration suppressing member using the gap extending jig of the fifth embodiment. FIG. 21 is an explanatory diagram of an example regarding a method of arranging a vibration suppressing member using the gap extending jig of the fifth embodiment. FIG. 22 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the sixth embodiment. FIG. 23 is an explanatory diagram of an example regarding a method of arranging a vibration suppressing member using the gap extending jig of the sixth embodiment. FIG. 24 is an explanatory diagram of an example regarding a method for arranging a vibration suppressing member using the gap extending jig of the sixth embodiment. FIG. 25 is an explanatory diagram of an example regarding a method for arranging a vibration suppressing member using the gap extending jig of the sixth embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. 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.

  FIG. 1 is a schematic side sectional view of a steam generator in which the gap extending jig of Example 1 is used. As one having a plurality of heat transfer tubes inside, for example, there is a steam generator 1 used in a pressurized water reactor (PWR). A primary coolant (for example, light water) as a reactor coolant and a neutron moderator flowing in the reactor and a secondary coolant flowing in the turbine flow into the steam generator 1. In the steam generator 1, the primary coolant that has become high temperature and high pressure is subjected to heat exchange with the secondary coolant, thereby evaporating the secondary coolant to generate steam, and primary cooling that has become high temperature and pressure. The material is cooling.

  Although details will be described later, the plurality of heat transfer tubes 5 provided in the steam generator 1 include the existing first vibration suppressing member 14A attached when the steam generator 1 is assembled and the steam generator 1. A second vibration suppression member 14B newly added after assembly (for example, after installation of the steam generator 1) is attached. At this time, the attachment of the second vibration suppressing member 14B is performed using a gap expanding jig. First, the steam generator 1 will be described with reference to FIG.

  The steam generator 1 has a hollow cylindrical shape extending in the vertical direction and sealed. The steam generator 1 has a trunk portion 2 whose lower half is slightly smaller in diameter than the upper half. The trunk portion 2 is provided with a tube group outer cylinder 3 having a cylindrical shape disposed at a predetermined distance from the inner wall surface of the trunk portion 2 in the lower half portion thereof. The lower end portion of the tube group outer tube 3 extends to the vicinity of the tube plate 4 disposed below in the lower half of the body portion 2. A heat transfer tube group 51 is provided in the tube group outer tube 3. The heat transfer tube group 51 includes a plurality of heat transfer tubes 5 having an inverted U shape. Each of the heat transfer tubes 5 is arranged so that the U-shaped arc portion is convex upward, and both end portions on the lower side are supported by the tube plate 4, and the intermediate portion includes a plurality of tube support plates 6. And is supported by the tube group outer tube 3. A large number of through holes (not shown) are formed in the tube support plate 6, and the heat transfer tubes 5 are inserted into the through holes.

  The body 2 is provided with a water chamber 7 at its lower end. The water chamber 7 is divided into an entrance chamber 71 and an exit chamber 72 by a partition wall 8. The entrance chamber 71 communicates with one end of each heat transfer tube 5, and the exit chamber 72 communicates with the other end of each heat transfer tube 5. The entrance chamber 71 is formed with an inlet nozzle 74 that communicates with the outside of the body portion 2, and the exit chamber 72 is formed with an exit nozzle 75 that communicates with the exterior of the body portion 2. The inlet nozzle 74 is connected to a cooling water pipe (not shown) through which a primary coolant is sent from the pressurized water reactor, and the outlet nozzle 75 passes the primary coolant after heat exchange to the pressurized water reactor. The cooling water piping (not shown) to send is connected.

  In the upper half of the body portion 2, the steam / water separator 9 that separates the secondary coolant after heat exchange into steam (gas phase) and hot water (liquid phase), and the moisture content of the separated steam A moisture separator 10 is provided to remove the water and bring it to a state close to dry steam. Between the steam / water separator 9 and the heat transfer tube group 51, a water supply pipe 11 for supplying water of the secondary coolant from the outside into the body 2 is inserted. Furthermore, the trunk | drum 2 has the vapor | steam exhaust port 12 formed in the upper end part. In addition, the body part 2 has a tube plate in which a secondary coolant supplied from the water supply pipe 11 into the body part 2 flows down between the body part 2 and the tube group outer cylinder 3 in the lower half part. A water supply path 13 that is folded back at 4 and raised along the heat transfer tube group 51 is formed. The steam outlet 12 is connected to a cooling water pipe (not shown) for sending steam to the turbine, and the water supply pipe 11 has two steams used in the turbine cooled by a condenser (not shown). A cooling water pipe (not shown) for supplying the next coolant is connected.

  In such a steam generator 1, the primary coolant heated in the pressurized water reactor is sent to the entrance chamber 71, circulates through the numerous heat transfer tubes 5, and reaches the exit chamber 72. On the other hand, the secondary coolant cooled by the condenser is sent to the water supply pipe 11 and rises along the heat transfer pipe group 51 through the water supply path 13 in the trunk portion 2. At this time, heat exchange is performed between the high-pressure and high-temperature primary coolant and the secondary coolant in the body portion 2. Then, the cooled primary coolant is returned from the exit chamber 72 to the pressurized water reactor. On the other hand, the secondary coolant that has exchanged heat with the high-pressure and high-temperature primary coolant rises in the body 2 and is separated into steam and hot water by the steam / water separator 9. The separated steam is sent to the turbine after moisture is removed by the moisture separator 10.

  In the steam generator 1 configured as described above, when the primary coolant passes through each heat transfer tube 5, fluid-excited vibration is generated in the inverted U-shaped arc portion. Therefore, a plurality of vibration suppressing members 14 that suppress vibration of the heat transfer tube 5 are provided in the arc portion of the heat transfer tube 5.

  FIG. 2 is a schematic plan view of the heat transfer tube group. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic perspective view of the heat transfer tube group.

  The upper end portion of the heat transfer tube group 51 is formed in a hemispherical shape by arranging arc portions of a plurality of heat transfer tubes 5 having an inverted U shape. That is, as shown in FIG. 3, each heat transfer tube 5 is bent with a predetermined curvature radius in the plane. For this reason, the heat transfer tube 5 is formed symmetrically with a center plane C that is an axial section of the heat transfer tube 5 passing through the apex as the center of the arc portion and the center of the radius of curvature. The plurality of heat transfer tubes 5 are provided so that the radius of curvature becomes larger toward the outside in the radial direction of the curvature radius in each plane, and the heat transfer tube layers 5A are provided side by side so that the axial directions are parallel to each other. It becomes.

  As shown in FIG. 2, the heat transfer tube layers 5 </ b> A are arranged in parallel with a predetermined gap in an out-of-plane direction orthogonal to the in-plane direction. In the plurality of heat transfer tube layers 5A, the radius of curvature of each heat transfer tube 5 on the outermost side in the radial direction of the radius of curvature in the plane decreases toward the outer side in the out-of-plane direction. By arranging the plurality of heat transfer tubes 5 in this manner, the upper end portion of the heat transfer tube group 51 is formed in a hemispherical shape.

  FIG. 5 is an axial sectional view of the heat transfer tube group in the center plane. As for the heat exchanger tube group 51 provided as mentioned above, the axial cross section of the some heat exchanger tube 5 in the center surface C becomes arrangement | positioning as shown in FIG. As shown in FIG. 5, in the center plane C, the laminated heat transfer tube layers 5A are arranged at different positions in the vertical direction in the in-plane direction. For this reason, the plurality of heat transfer tubes 5 are arranged in a staggered manner on the center plane C. And as shown in FIG. 5, the some vibration suppression member 14 and the gap expansion jig 80 mentioned later are inserted in the clearance gap between the adjacent heat exchanger tube layers 5A.

  The vibration suppressing member 14 is made of a metal material such as stainless steel, for example. In addition, as described above, the plurality of vibration suppression members 14 include the existing (existing) plurality of first vibration suppression members 14A and the plurality of second vibration suppression members 14B that are additionally provided. FIG. 4 illustrates a part of the second vibration suppressing member 14B that is additionally provided, and is not limited to the arrangement illustrated in FIG.

  As shown in FIG. 3, the first vibration suppressing member 14A is formed by bending a rod having a rectangular cross section into a substantially V shape. 14 A of 1st vibration suppression members are arrange | positioned so that the bent part bent may be located in the radial direction center side (inner side) in the curvature radius of the heat exchanger tube 5, and the both ends may be located in the radial direction outer side Be placed. Both end portions of the first vibration suppressing member 14A protrude outward from the heat transfer tube 5 on the outermost side in the radial direction of the radius of curvature.

  As shown in FIG. 3, the plurality of first vibration suppression members 14A include a first vibration suppression member 14A having a large V shape and a first vibration suppression member 14A having a small V shape. The first vibration suppression member 14A having a small V shape is disposed inside the first vibration suppression member 14A having a large V shape, thereby forming a pair. For example, three pairs of first vibration suppressing members 14A that form a pair are disposed in a gap between two heat transfer tube layers 5A that are adjacent (stacked) in the out-of-plane direction. 14 A of 1st vibration suppression members used as 3 sets of pairs are provided along the circumferential direction of a curvature radius. That is, of the three sets, the first vibration suppressing member 14A that is a pair of the first vibration suppressing member 14A that is provided at the center so that the bent portion is located on the center plane C, Two pairs of first vibration suppressing members 14 </ b> A are provided on both sides.

  As described above, the plurality of first vibration suppressing members 14 </ b> A are disposed, and as shown in FIG. 4, the end portions of the plurality of first vibration suppressing members 14 </ b> A are hemispherical arcs of the heat transfer tube group 51. Are arranged in a line in the out-of-plane direction of the heat transfer tube layer 5A. Further, the end portions of the first vibration suppressing members 14A in a row are arranged in a plurality of rows at predetermined intervals along the in-plane direction of the heat transfer tube layer 5A along the hemispherical arc of the heat transfer tube group 51. The That is, the end portions of the plurality of first vibration suppressing members 14A are arranged in a lattice shape on the hemispherical surface.

  And by arrange | positioning the edge part of several 1st vibration suppression member 14A in a grid | lattice form, while the clearance gap between 5 A of heat exchanger tube layers is divided into plurality in the in-plane direction of 5 A of heat exchanger tube layers, a heat exchanger tube layer It is divided into a plurality in the out-of-plane direction of 5A. That is, the gaps between the heat transfer tube layers 5A are partitioned into a plurality of lattices by the end portions of the plurality of first vibration suppressing members 14A. For this reason, the gap of the heat transfer tube layer 5A is defined by the first vibration suppressing member 14A.

  15 A of joining members are each provided in the both ends of each 1st vibration suppression member 14A. The joining member 15A is joined to a holding member 16A described later, as shown in FIGS. The joining member 15A is made of a metal material such as stainless steel, for example.

  As shown in FIGS. 2 and 4, the holding member 16 </ b> A is a rod formed in an arc shape along the hemispherical outer periphery of the heat transfer tube group 51. The holding member 16 </ b> A is arranged so as to connect the end portions of the first vibration suppressing members 14 </ b> A arranged in a line along the hemispherical arc of the heat transfer tube group 51. Then, a joining member 15A provided at the end of each first vibration suppressing member 14A is joined to the holding member 16A by welding or the like. An attachment member 17 described later is joined to the holding member 16A by welding or the like.

  The attachment member 17 is formed in a substantially U-shape, and is inserted between the heat transfer tube 5 on the outermost side in the radial direction of the radius of curvature and the heat transfer tube 5 on the inner side. And the holding member 16A is attached to the heat exchanger tube group 51 by joining the both ends of the attachment member 17 to the holding member 16A by welding or the like.

  In addition, although the 1st vibration suppression member 14A used the V-shaped thing, the thing of a rectangular parallelepiped shape (linear shape) is used, or the thing of a V shape and a rectangular parallelepiped shape are used together. There is no particular limitation.

  As shown in FIG. 3, the second vibration suppression member 14 </ b> B is a rectangular parallelepiped (linear shape) rod body having a rectangular cross section. The second vibration suppressing member 14B is arranged so that its longitudinal direction is the same as the radial direction of the radius of curvature. That is, the second vibration suppressing member 14B is disposed so that one end portion in the longitudinal direction thereof is positioned on the center side (inner side) in the radial direction of the radius of curvature of the heat transfer tube 5, and the other end portion in the longitudinal direction is disposed in the radial direction. It arrange | positions so that it may be located outside. For this reason, the 2nd vibration suppression member 14B is inserted in the clearance gap between the heat exchanger tubes 5 from the one end part side. The other end of the second vibration suppressing member 14B protrudes outward from the heat transfer tube 5 located on the outermost side in the radial direction of the radius of curvature.

  The plurality of second vibration suppression members 14B are appropriately provided in the plurality of gaps of the heat transfer tube layer 5A in a lattice shape partitioned by the ends of the plurality of first vibration suppression members 14A. For example, each of the plurality of second vibration suppression members 14B is provided for each pair of the first vibration suppression members 14A, and between the three pairs of first vibration suppression members 14A. Two may be provided. One of the three second vibration suppression members 14B provided for the pair of first vibration suppression members 14A is provided inside the first vibration suppression member 14A having a small V shape. The remaining two second vibration suppression members 14B are respectively provided between both end portions of the first vibration suppression member 14A having a small V shape and both end portions of the first vibration suppression member 14A having a large V shape. The two second vibration suppressing members 14B provided between the three pairs of first vibration suppressing members 14A include a pair of first vibration suppressing members 14A provided at the center and both sides thereof. Are provided between the pair of first vibration suppressing members 14 </ b> A that are paired with each other. In addition, since the 2nd vibration suppression member 14B is formed in a cross-sectional rectangular shape and each heat exchanger tube 5 is a round tube, the 2nd vibration suppression member 14B and the heat exchanger tube 5 will be in line contact.

  As described above, since the plurality of second vibration suppression members 14B are arranged, the illustration of the second vibration suppression members 14B is omitted. The heat transfer tube group 51 is arranged in a line along the hemispherical arc in the out-of-plane direction of the heat transfer tube layer 5A. Further, the end portions of the second vibration suppressing members 14B in a row are arranged in a plurality of rows at predetermined intervals along the in-plane direction of the heat transfer tube layer 5A along the hemispherical arc of the heat transfer tube group 51. The

  Each of the second vibration suppressing members 14B is provided with a joining member 15B at the other end (a radially outer end). As shown in FIGS. 2 and 3, the joining member 15B is joined to a holding member 16B described later. The joining member 15B is made of a metal material such as stainless steel, for example.

  As shown in FIG. 2, the holding member 16 </ b> B is substantially the same as the holding member 16 </ b> A, and is a rod formed in an arc shape along the hemispherical outer periphery of the heat transfer tube group 51. The holding member 16B is disposed so as to connect the end portions of the second vibration suppressing members 14B arranged in a line along the hemispherical arc of the heat transfer tube group 51. For this reason, the holding member 16B is disposed between the adjacent holding members 16A. And the joining member 15B provided in the other end part of each 2nd vibration suppression member 14B is joined to this holding member 16B by welding etc. FIG.

  Next, the gap extending jig 80 will be described with reference to FIG. FIG. 6 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the first embodiment. In addition, below, the case where the clearance gap expansion jig 80 is used when the 2nd vibration suppression member 14B is additionally installed in the existing steam generator 1 is demonstrated. However, the gap extending jig 80 is not limited to this usage. For example, you may use when attaching the 2nd vibration suppression member 14B at the time of the assembly of the steam generator 1. FIG. When the second vibration suppression member 14B is additionally installed in the existing steam generator 1, the plurality of heat transfer tubes 5 may be in an environment submerged in water (underwater environment) in order to reduce the influence of neutrons. Good. For this reason, the gap extending jig 80 may be used in an underwater environment.

  As shown in FIG. 6, the gap extending jig 80 includes a jig body 81. The jig body 81 is formed in a rod shape extending in the longitudinal direction, and is made of a metal such as a steel material or a reinforced plastic. The jig body 81 is formed in a rectangular shape in a cross section orthogonal to the longitudinal direction. At this time, the short short side (short part) of the outside dimension of the rectangle is shorter than the length in the direction in which the heat transfer tubes 5 face each other in the gap between the adjacent heat transfer tube layers 5A (heat transfer tubes 5). On the other hand, the long long side (long portion) of the rectangular outer dimension is longer than the length in the direction in which the heat transfer tubes 5 of the gap between the adjacent heat transfer tube layers 5A (heat transfer tubes 5) face each other. Further, the jig body 81 is formed in a curved surface whose corners in a rectangle are convex outward. The jig body 81 is rotatable with the longitudinal direction as the axial direction. By rotating the jig body 81, the short side and the long side of the jig body 81 are transitioned in the direction in which the heat transfer tubes 5 face each other.

  Next, with reference to FIG. 7 to FIG. 13, a method of arranging the vibration suppressing member 14 for newly adding the second vibration suppressing member 14 </ b> B to the existing steam generator 1 will be described. 7 to 12 are explanatory views of an example regarding a method of arranging the vibration suppressing member using the gap extending jig of the first embodiment. FIG. 13 is a flowchart regarding a method of arranging the vibration suppressing member. As shown in FIG. 7, in the existing steam generator 1 before the second vibration suppressing member 14B is disposed, the heat transfer tube group 51 includes a plurality of heat transfer tube layers 5A (in FIG. 7, only the outermost heat transfer tube 5 is illustrated. ) Are disposed with a predetermined gap therebetween, whereby the plurality of outermost heat transfer tubes 5 are disposed in parallel. The plurality of first vibration suppression members 14A are provided in the gaps between the adjacent heat transfer tube layers 5A, and the ends of the plurality of first vibration suppression members 14A are arranged in a lattice shape. For this reason, the width of the gap between the adjacent heat transfer tube layers 5A is defined by the first vibration suppressing member 14A provided in the gap.

  When the second vibration suppressing member 14B is additionally installed with respect to the existing steam generator 1, first, as shown in FIG. 8, the short side of the jig body 81 is in the direction in which the heat transfer tube 5 faces. Thus, the jig body 81 is inserted into a predetermined gap of the heat transfer tube 5 (jig insertion process: step S1 in FIG. 13). In the jig insertion step S1, the jig body 81 is inserted through the insertion path shown in FIG.

  After the jig body 81 is inserted, the jig body 81 is rotated as shown in FIG. When the jig body 81 is rotated, in the direction in which the heat transfer tubes 5 face each other, the jig body 81 changes from the length at the short side of the rectangle to the length at the long side of the rectangle through the length at the diagonal of the rectangle. Transition. For this reason, the gap between the heat transfer tubes 5 is slightly narrowed on the long side of the rectangular shape of the jig body 81 after being expanded to be the largest in the rectangular diagonal of the jig body 81. At this time, since the long side of the rectangle of the jig body 81 is longer than the gap of the heat transfer tube 5, the jig body 81 expands the gap of the heat transfer tube 5 (heat transfer tube layer 5A) (gap expansion step: FIG. 13). Step S2). When the gap between the heat transfer tubes 5 is expanded, as shown in FIG. 10, the second vibration suppressing member 14B is inserted with the gap between the heat transfer tubes 5 expanded (member insertion step: step S3 in FIG. 13). ). At this time, the second vibration suppression member 14B is formed to be approximately the same as or slightly wider than the gap of the heat transfer tube 5 before expansion, and is formed to be shorter than the length of the long side of the jig body 81. Therefore, the heat transfer tube 5 is preferably inserted into the gap. In other words, since the length of the long side of the jig body 81 is longer than the second vibration suppressing member 14B in the direction in which the heat transfer tubes face each other, the second vibration suppressing member 14B includes the heat transfer tube 5. Is preferably inserted into the gap.

  When the second vibration suppressing member 14B is inserted, the jig body 81 is rotated again. As shown in FIG. 11, when the jig main body 81 is rotated, the jig main body 81 becomes rectangular from the length of the long side of the rectangle to the length of the diagonal of the rectangle in the direction in which the heat transfer tubes 5 face each other. Move to the length of the short side. For this reason, the gap between the heat transfer tubes 5 is expanded so as to be the largest in the rectangular diagonal line of the jig body 81, and then returns to the gap before expansion at the rectangular short side of the jig body 81. That is, since the rectangular short side of the jig body 81 is shorter than the gap between the heat transfer tubes 5, the jig body 81 releases the expansion of the gap between the heat transfer tubes 5 (expansion releasing step: step S4 in FIG. 13). When the expansion of the gap by the jig body 81 is released, the inserted second vibration suppressing member 14 </ b> B comes into contact with the heat transfer tube 5 by being sandwiched by the heat transfer tube 5. 12, since the jig body 81 is smaller than the gap between the heat transfer tubes 5, in this state, the jig body 81 is pulled out from the gap between the heat transfer tubes 5 (jig extraction step: FIG. 13 step S5). Thereby, arrangement | positioning of the 2nd vibration suppression member 14B is complete | finished. By repeatedly performing these steps, the plurality of second vibration suppressing members 14B are arranged.

  As described above, according to the configuration of the first embodiment, in addition to the existing first vibration suppression member 14A, the second vibration suppression member 14B can be newly arranged using the gap expanding jig 80. At this time, the gap extending jig 80 is inserted so that the jig body 81 is in the direction in which the short side of the jig body 81 faces the gap of the heat transfer tube 5. The jig body 81 can be suitably inserted. Thereafter, the jig body 81 is rotated so that the long side of the jig body 81 is in the direction in which the heat transfer tube 5 faces the gap of the heat transfer tube 5, thereby reducing the gap of the heat transfer tube 5. Can be extended. And since the 2nd vibration suppression member 14B can be inserted in the clearance gap between the heat exchanger tubes 5 in the state which expanded the clearance gap between the heat exchanger tubes 5, the 2nd vibration suppression member 14B can be inserted suitably. And since the inserted 2nd vibration suppression member 14B can be made to contact each heat exchanger tube 5, it becomes possible to suppress suitably the vibration of each heat exchanger tube 5. FIG. Therefore, the steam generator 1 can reduce wear at the contact portion between the heat transfer tube 5 and the vibration suppressing member 14.

  Moreover, according to the structure of Example 1, the cross section cut by the surface orthogonal to the longitudinal direction of the jig | tool main body 81 can be made into a rectangular shape. For this reason, the gap of the heat transfer tube 5 is expanded so as to become the largest in the rectangular diagonal line of the jig body 81, and thereafter, the gap is slightly narrowed along the long side of the rectangle of the jig body 81. Thereby, in the direction where the heat transfer tubes 5 face each other, the jig body 81 having a length on the long side of the rectangle functions as a stopper in the rectangular diagonal line of the jig body 81. Can be difficult to return.

  Further, according to the configuration of the first embodiment, the corners of the rectangular shape of the cross section orthogonal to the longitudinal direction of the jig main body 81 can be curved, so that the heat transfer tube 5 can be cured without being damaged. The tool body 81 can be rotated.

  Further, according to the configuration of the first embodiment, the second vibration suppressing member 14B is formed in the same direction as the gap between the heat transfer tubes 5 before expansion or slightly wider in the facing direction of the adjacent heat transfer tubes 5, On the other hand, it is formed shorter than the length of the long side of the jig body 81. In other words, the length of the long side of the jig body 81 is longer than that of the second vibration suppressing member 14B in the direction in which the heat transfer tubes face each other. For this reason, the 2nd vibration suppression member 14B can be suitably inserted in the clearance gap between the heat exchanger tubes 5. FIG.

  In addition, according to the configuration of the first embodiment, since the holding of the jig body 81 by the heat transfer tube 5 can be released by performing the extension releasing process S4 before the jig extracting process S5, the jig extracting process is performed. In step S5, the jig body 81 can be easily pulled out.

  In the first embodiment, the cross section cut by the plane orthogonal to the longitudinal direction of the jig body 81 is rectangular, but the present invention is not limited to this configuration. For example, a cross section cut by a plane orthogonal to the longitudinal direction of the jig body 81 may be an ellipse. In this case, by rotating the jig body 81, the major axis (long part) and the minor axis (short part) of the ellipse may be changed in the direction in which the heat transfer tubes 5 face each other. In other words, by rotating the jig body 81, any shape can be used as long as the short part with a short outside dimension and the long part with a long outside dimension can transition in the cross section of the jig body 81. Also good.

  Moreover, in Example 1, although the extension cancellation | release process S4 was performed, it is not restricted to this structure, You may perform jig | tool extraction process S5, without performing the extension cancellation | release process S4.

  Next, the gap extending jig 100 according to the second embodiment will be described with reference to FIG. In the second embodiment, only parts different from the first embodiment will be referred to in order to avoid the description overlapping with the first embodiment. FIG. 14 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the second embodiment. The gap extending jig 100 according to the second embodiment has a configuration in which the operation member 102 is provided on the jig main body 81 according to the first embodiment. Hereinafter, the gap extending jig 100 according to the second embodiment will be described with reference to FIG.

  As illustrated in FIG. 14, the gap extending jig 100 according to the second embodiment includes a jig body 101 and an operation member 102. Since the jig body 101 has the same configuration as that of the first embodiment, the description thereof is omitted. The operation member 102 is attached to one end of the jig body 101 in the longitudinal direction, and is for operating the jig body 101. The operation member 102 is formed in a T shape with a portion extending in the longitudinal direction from the jig body 101 and a portion orthogonal to the longitudinal direction. For this reason, by operating the operation member 102, the jig body 101 can be inserted into the gap between the heat transfer tubes 5, or the jig body 101 can be rotated.

  As described above, according to the configuration of the second embodiment, the jig main body 101 can be rotated by operating the operation member 102. Therefore, the jig main body 101 can be easily rotated manually. . Further, since the jig body 101 can be inserted into the gap between the heat transfer tubes 5 by operating the operation member 102, for example, the jig body 101 can be suitably handled even in an underwater environment.

  Next, the gap extending jig 110 according to the third embodiment will be described with reference to FIGS. 15 to 17. In the third embodiment, only parts different from the first embodiment will be referred to in order to avoid the description overlapping with the first embodiment. FIG. 15 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the third embodiment. FIGS. 16 and 17 are explanatory diagrams of an example regarding a method of arranging the vibration suppressing member using the gap extending jig of the third embodiment. The gap extending jig 110 according to the third embodiment is provided with a pair of sheet members 112 between the jig main body 81 according to the first embodiment and the heat transfer tubes 5 on both sides of the jig main body 81. Hereinafter, with reference to FIGS. 15 to 17, the gap extending jig 110 according to the third embodiment will be described.

  As illustrated in FIG. 15, the gap extending jig 110 according to the third embodiment includes a jig body 111 and a pair of sheet members 112. Since the jig body 111 has the same configuration as that of the first embodiment, the description thereof is omitted. The pair of sheet members 112 are provided between the heat transfer tube 5 and the jig body 111 in the direction in which the heat transfer tubes 5 face each other, and are arranged in parallel. The sheet member 112 is configured by a thin plate-shaped metal, a reinforcing fiber formed in a thin plate shape, or the like, and is configured to protect the heat transfer tube 5. The sheet member 112 is provided along the longitudinal direction of the jig body 111 and is disposed so that one end of the jig body 111 is exposed. For this reason, the jig body 111 can rotate the one end portion of the jig body 111 without being obstructed by the sheet member 112 by exposing one end portion of the jig body 111. It becomes possible. The sheet member 112 is formed wide so that the jig body 111 does not deviate from the sheet member 112 when the jig body 111 rotates. That is, the sheet member 112 is longer than the length of the long side of the jig body 111 in a direction orthogonal to the direction in which the heat transfer tubes 5 face each other.

  As shown in FIG. 16, the gap extending jig 110 configured in this way is arranged so that the short side of the jig main body 111 faces the heat transfer tube 5 in the jig insertion step S <b> 1. The main body 111 is inserted into a predetermined gap of the heat transfer tube 5. At this time, the pair of sheet members 112 are inserted together with the jig main body 111 so as to be positioned between the heat transfer tube 5 and the jig main body 111.

  In addition, as shown in FIG. 17, when the jig body 111 is rotated in the gap expanding step S2, the jig body 111 has a rectangular shape from the length on the short side of the rectangle in the direction in which the heat transfer tubes 5 face each other. Transition to the length of the long side. In addition, although illustration is abbreviate | omitted, in the extension cancellation | release process S4, by rotating the jig | tool main body 111 again, in the direction where the heat exchanger tube 5 opposes, the jig | tool main body 111 is from the length in the long side of a rectangle, Transition to the length of the short side of the rectangle.

  As described above, according to the configuration of the third embodiment, since the heat transfer tube 5 can be protected by the pair of sheet members 112, the jig body 111 is rotated without scratching the heat transfer tube 5. Can be made.

  Next, a gap expanding jig 120 according to the fourth embodiment will be described with reference to FIG. In the fourth embodiment, only parts different from the third embodiment will be referred to in order to avoid the description overlapping with the third embodiment. FIG. 18 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the fourth embodiment. The gap expanding jig 120 of the fourth embodiment is obtained by providing a connecting mechanism to the gap expanding jig 110 of the third embodiment. Hereinafter, with reference to FIG. 18, the gap expansion jig 120 of Example 4 will be described.

  The gap extending jig 120 of the fourth embodiment includes a jig body 121, a sheet member 122, a connecting plate 123 and a connecting member 124 as a connecting mechanism. Note that the jig main body 121 and the sheet member 122 have the same configurations as those of the third embodiment, and thus description thereof is omitted. The connection plate 123 is provided in the longitudinal direction along the pair of sheet members 122. The connecting member 124 is formed in a string shape, and connects the connecting plate 123 and the jig main body 121 and connects the connecting plate 123 and each of the pair of sheet members 122. The connecting member 124 connects, for example, both ends in the longitudinal direction of the jig body 121 and both ends in the longitudinal direction of the connecting plate 123. Similarly, the connecting member 124 connects, for example, both ends in the longitudinal direction of the sheet member 122 and both ends in the longitudinal direction of the connecting plate 123.

  At this time, the connection plate 123 and the connection member 124 are provided at positions that do not hinder the rotation of the jig body 121. The connecting plate 123 and the connecting member 124 connect the jig main body 121 and the pair of sheet members 122 so that the pair of sheet members 122 are arranged on both sides of the jig main body 121.

  As described above, according to the configuration of the fourth embodiment, the jig body 121 and the pair of sheet members 122 can be coupled by the coupling plate 123 and the coupling member 124. 122 can be handled integrally without scattering, and the sheet member 122 can be prevented from dropping.

  Next, with reference to FIG. 19 to FIG. 21, a gap extending jig 130 according to the fifth embodiment will be described. In the fifth embodiment, only parts different from the third embodiment will be referred to in order to avoid the description overlapping with the third embodiment. FIG. 19 is a schematic configuration diagram illustrating an outline of a gap extending jig according to the fifth embodiment. FIGS. 20 and 21 are explanatory diagrams of an example regarding a method of arranging a vibration suppressing member using the gap expanding jig of the fifth embodiment. The gap expanding jig 130 according to the fifth embodiment is obtained by forming a locking groove 132a on the sheet member 112 of the gap expanding jig 110 according to the third embodiment. Hereinafter, with reference to FIGS. 19 to 21, the gap expanding jig 130 of the fifth embodiment will be described.

  As illustrated in FIG. 19, the gap extending jig 130 according to the fifth embodiment includes a jig body 131 and a pair of sheet members 132. Note that the jig body 131 has the same configuration as that of the third embodiment, and a description thereof will be omitted. Further, the pair of sheet members 132 has substantially the same configuration as that of the third embodiment, and a locking groove 132a is formed on a surface with which the jig body 131 comes into contact. The locking groove 132a is a groove formed in a V shape in the cross section cut in the longitudinal direction so that the corner portion of the jig body 131 having a rectangular cross section cut in the longitudinal direction is fitted. The locking groove 132a is formed extending in the longitudinal direction.

  The jig body 131 according to the fifth embodiment is handled in a state of being locked in the locking grooves 132a of the pair of sheet members 132. For this reason, the jig body 131 has an angle formed by a pair of sheet members 132 that are parallel to each other in the longitudinal direction and a long side (or short side) of the jig body 131, and a predetermined inclination angle. It arrange | positions diagonally so that it may become. At this time, the jig body 131 is disposed obliquely with respect to the pair of sheet members 132 so as to be shorter than the length of the gap in the direction in which the heat transfer tubes 5 face each other.

  As shown in FIG. 20, the gap extending jig 130 configured as described above is inserted together with the pair of sheet members 132 in the jig insertion step S <b> 1 in a state where the jig main body 131 is disposed obliquely.

  Further, as shown in FIG. 21, in the gap expanding step S2, the jig body 131 is rotated and the pair of sheet members 132 are moved. Specifically, in the gap expanding step S <b> 2, the pair of sheet members 132 are moved in opposite directions in the direction orthogonal to the direction in which the heat transfer tubes 5 face each other, and the short side of the jig body 131 and each sheet member 132. And move so that they approach (contact). Thereby, the jig main body 131 is rotated so that the jig main body 131 has a length on the long side of the rectangle in the direction in which the heat transfer tubes 5 face each other.

  As described above, according to the configuration of the fifth embodiment, it is possible to assist the rotation of the jig body 131 by moving the pair of sheet members 132 while protecting the heat transfer tubes 5 by the pair of sheet members 132. Therefore, the jig body 131 can be easily rotated.

  Next, with reference to FIGS. 22 to 25, a gap expanding jig 140 according to the sixth embodiment will be described. In the sixth embodiment, only parts different from the first embodiment will be referred to in order to avoid the description overlapping with the first embodiment. FIG. 22 is a schematic configuration diagram illustrating an outline of the gap extending jig according to the sixth embodiment. FIG. 23 to FIG. 25 are explanatory diagrams of an example regarding a method for arranging a vibration suppressing member using the gap extending jig of the sixth embodiment. The gap expanding jig 140 according to the sixth embodiment is provided with a rotation assisting mechanism that assists the rotation of the gap expanding jig 80 according to the first embodiment. Hereinafter, with reference to FIGS. 22 to 25, the gap expanding jig 140 according to the sixth embodiment will be described.

  As illustrated in FIG. 22, the gap extending jig 140 according to the sixth embodiment includes a jig body 141 and a pair of pressing members 142 and a fastening member 143 as a rotation assist mechanism. Note that the jig main body 141 has the same configuration as that of the first embodiment, and a description thereof will be omitted. The pair of pressing members 142 are provided on both sides of the jig main body 141 in the direction orthogonal to the direction in which the heat transfer tube 5 faces. The pressing member 142 is made of a metal such as a steel material, reinforced plastic, or the like, and is provided along the longitudinal direction of the jig body 141. The pressing member 142 has a trapezoidal cross section cut by a surface orthogonal to the longitudinal direction, and the surface facing the jig body 141 is inclined with respect to the surface on the short side of the jig body 141. ing. At this time, the inclined surfaces of the pair of pressing members 142 are parallel to each other.

  The fastening member 143 is formed of a string such as a steel wire, and is disposed along the periphery of the pair of pressing members 142 provided on both sides of the jig main body 141. Specifically, a receiving groove for receiving the fastening member 143 is formed on the surface opposite to the inclined surface of the pressing member 142 so as to extend in the longitudinal direction. And the fastening member 143 is arrange | positioned so that a pair of pressing member 142 may be enclosed by letting the string-shaped fastening member 143 pass to each of the accommodation groove | channel of a pair of pressing member 142. FIG. Then, by tightening the fastening member 143, the inclined surfaces of the pair of pressing members 142 are pressed against the jig main body 141, so that the jig main body 141 follows the inclined surfaces of the pair of pressing members 142. It can be fixed while rotating.

  In the sixth embodiment, the jig main body 141 before being fastened by the fastening member 143 is handled while being sandwiched between the pair of pressing members 142. For this reason, the jig body 141 is disposed obliquely so that the angle formed between the heat transfer tube 5 and the long side (or short side) of the jig body 141 is a predetermined inclination angle in a cross section cut in the longitudinal direction. Is done. At this time, the jig body 141 is disposed obliquely with respect to the heat transfer tube 5 so as to be shorter than the length of the gap in the direction in which the heat transfer tube 5 faces.

  As shown in FIG. 23, the gap extending jig 140 configured as described above is inserted together with the pair of pressing members 142 in the jig insertion step S1 in a state where the jig main body 141 is obliquely arranged. .

  Further, as shown in FIG. 24, in the gap expanding step S2, the jig body 141 is rotated by the pair of pressing members 142 by tightening the fastening member 143. Specifically, by tightening the fastening member 143, the short side of the jig body 141 and the heat transfer tube 5 are rotated so as to approach (contact). Thereafter, in the gap expanding step S <b> 2, the fastening member 143 is further tightened to fix the jig body 141 along the inclined surfaces of the pair of pressing members 142.

  And as shown in FIG. 25, the jig | tool main body 141 rotates so that the length in the long side of a rectangle may turn into the direction where the heat exchanger tube 5 opposes by canceling | releasing the fastening by the fastening member 143. That is, the jig main body 141 is rotated so that the long side of the rectangular shape of the jig main body 141 is in the direction in which the heat transfer tubes 5 face each other when the fixing by the pair of pressing members 142 is released.

  On the other hand, in the extension releasing step S4, the jig body 141 is rotated by the pair of pressing members 142 by tightening the fastening member 143 again. Specifically, by tightening the fastening member 143, the short side of the jig body 141 is rotated away from the heat transfer tube 5. Thereafter, in the extension releasing step S <b> 4, the fastening member 143 is further tightened to fix the jig body 141 along the inclined surfaces of the pair of pressing members 142. And the jig | tool main body 141 rotates so that the length in the short side of a rectangle may turn into the direction which the heat exchanger tube 5 opposes by canceling | releasing the fastening by the fastening member 143. At this time, the jig body 141 may be rotated.

  As described above, according to the configuration of the sixth embodiment, the jig main body 141 can be rotated by pressing the pair of pressing members 142 from both sides of the jig main body 141 by tightening the fastening member 143. Therefore, the jig main body 141 can be easily rotated with a simple configuration.

  In the sixth embodiment, the jig main body 141 is fixed along the inclined surfaces of the pair of pressing members 142 by tightening the fastening member 143. However, the present invention is not limited to this configuration. That is, the fastening member 143 is tightened and the pair of pressing members 142 are pressed against the jig main body 141 so that the long side of the jig main body 141 is opposed to the direction in which the heat transfer tube 5 faces. Thus, the jig body 81 may be rotated.

  Moreover, you may combine suitably the structure of the gap expansion jig | tool 80,100,110,120,130,140 as described in Example 1-6.

DESCRIPTION OF SYMBOLS 1 Steam generator 2 Body 3 Tube group outer cylinder 4 Tube plate 5 Heat transfer tube 5A Heat transfer tube layer 6 Tube support plate 7 Water chamber 8 Bulkhead 9 Air-water separator 10 Moisture separator 11 Water supply pipe 12 Steam exhaust port 14 Vibration Suppression Member 14A First Vibration Suppression Member 14B Second Vibration Suppression Member 15A Joining Member 15B Joining Member 16A Holding Member 16B Holding Member 17 Mounting Member 51 Heat Transfer Tube Group 71 Entrance Chamber 72 Exit Chamber 74 Inlet Nozzle 75 Outlet Nozzle 80 Gap Expansion Jig 81 Jig body 100 Gap expansion jig (Example 2)
101 Jig body (Example 2)
102 Operation member 110 Gap expansion jig (Example 3)
111 Jig body (Example 3)
112 Sheet member 120 Gap expansion jig (Example 4)
121 Jig body (Example 4)
122 Sheet member (Example 4)
123 Connection plate 124 Connection member 130 Gap expansion jig (Example 5)
131 Jig body (Example 5)
132 Sheet members (Example 5)
132a Locking groove 140 Gap expanding jig (Example 6)
141 Jig body (Example 6)
142 Pushing member 143 Fastening member

Claims (12)

In order to insert a vibration suppressing member for suppressing vibration of the heat transfer tube into a gap between adjacent heat transfer tubes, a heat transfer tube gap expansion jig for expanding the gap,
A jig body inserted into the gap,
The jig body extends in the longitudinal direction and is rotatable about the longitudinal direction as an axial direction. In the cross section orthogonal to the longitudinal direction, the short part having a short outer dimension and the long outer dimension are provided. And having a long part,
The length of the short part is shorter than the length of the gap in the direction in which the adjacent heat transfer tubes face each other,
The length of the long part is longer than the length of the gap in the direction in which the adjacent heat transfer tubes are opposed to each other. The jig body has a rectangular cross section orthogonal to the longitudinal direction,
The length of the short part is the length of the short side of the rectangle,
The gap extending jig for a heat transfer tube according to claim 1, wherein the length of the long portion is a length of a long side of the rectangle.   The gap extension jig for a heat transfer tube according to claim 2, wherein the jig main body has a curved corner in the rectangle having a cross section perpendicular to the longitudinal direction.   The length of the said long part is longer than the said vibration suppression member in the direction where the said adjacent heat exchanger tube opposes, The heat exchanger tube of any one of Claim 1 thru | or 3 characterized by the above-mentioned. Gap expansion jig.   The gap of the heat exchanger tube according to any one of claims 1 to 4, further comprising an operation member attached to one end portion in the longitudinal direction of the jig body and operating the jig body. Expansion jig.   The gap between the heat transfer tubes according to any one of claims 1 to 5, further comprising a pair of sheet members provided between the jig main body and the heat transfer tubes on both sides of the jig main body. Expansion jig.   The gap expansion jig for a heat transfer tube according to claim 6, further comprising a coupling mechanism that couples the jig body and the pair of sheet members. The pair of sheet members are each formed with a locking groove for locking the jig body,
The gap expansion of the heat transfer tube according to claim 6 or 7, wherein the jig body is rotated by moving the pair of sheet members in a state where the jig main body is engaged with the pair of sheet members. jig.   The gap expansion jig for a heat transfer tube according to any one of claims 1 to 8, further comprising a rotation assist mechanism for assisting the rotation of the jig body. The rotation assist mechanism is
A pair of pressing members provided on both sides of the jig body in a direction perpendicular to the direction in which the adjacent heat transfer tubes face each other;
A fastening member engaged with the pair of pressing members and fastened to press the pair of pressing members against the jig body;
The gap extending jig for a heat transfer tube according to claim 9, wherein the pair of pressing members are rotated by pressing the jig main body by being fastened by the fastening member. A vibration suppressing member for suppressing vibration of the heat transfer tubes is arranged in the gap between the adjacent heat transfer tubes using the heat transfer tube gap extension jig according to any one of claims 1 to 10. An arrangement method of a vibration suppressing member to be installed,
A jig insertion step of inserting the jig body so that the short portion is in a direction in which the heat transfer tube faces the gap between the heat transfer tubes,
A gap expanding step of expanding the gap by rotating the jig body so that the long portion is in a direction in which the heat transfer pipe faces the gap of the heat transfer pipe,
A member insertion step of inserting the vibration suppressing member into the expanded gap;
And a jig extracting step of extracting the gap expanding jig from the gap.   Before the jig pulling step, the extension of the gap is released by rotating the jig body so that the short portion is in the direction in which the heat transfer tube faces the gap of the heat transfer tube. The method for disposing a vibration suppressing member according to claim 11, further comprising an expansion releasing step.