JP2014047993A - 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 adjoining heat transfer pipes used for appropriately inserting a vibration suppression member into the clearance of the adjoining heat transfer pipes, and a method of arranging a vibration suppression member using the clearance expansion jig.SOLUTION: This invention relates to a method for arranging vibration suppression member for suppressing vibration of a heat transfer pipe 5 within a clearance between the adjoining heat transfer pipes 5 under application of a clearance expansion jig 80 provided with a jig main body 81 including shape memory material for deforming a clearance to expand while being heated and a heater 82 capable of heating the jig main body 81, comprising the steps of jig insertion for inserting the clearance expansion jig 80 into the clearance of the adjoining heat transfer pipes 5, expanding clearance for expanding clearance by the jig main body 81 while heating the jig main body 81 with the heater 82, member insertion for inserting a second vibration suppression member 14B into the expanded clearance, releasing expansion for releasing expansion of the clearance with the jig main body 81 while cooling down the jig main body 81, and jig pulling for pulling out the clearance expansion jig 80 from the clearance.

Description

  TECHNICAL FIELD The present invention relates to a heat transfer tube gap expanding jig and a vibration suppressing member arranging method for expanding a gap between adjacent heat transfer tubes.

  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.

  The gap extension jig of the heat transfer tube of the present invention is disposed in the gap between adjacent heat transfer pipes, and includes a jig body including a shape memory material that is deformed so that the gap can be expanded by heating, and a temperature of the jig body. And an adjustable temperature adjustment unit.

  According to this configuration, the jig main body including the shape memory material can be deformed so as to expand the gap between the heat transfer tubes by heating the jig main body with the temperature adjusting unit. 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. The temperature adjustment unit may cool the jig body. In this case, since the jig body can be cooled more quickly than when the jig body is naturally cooled, the expansion of the gap in the heat transfer tube can be canceled by narrowing the jig body earlier. It becomes possible.

  In this case, the jig body is preferably smaller than the gap before heating by the temperature adjusting unit, and larger than the gap after heating by the temperature adjusting unit.

  According to this configuration, the jig body before heating can be easily inserted into the gap between the heat transfer tubes. Moreover, the clearance gap between heat exchanger tubes can be expanded reliably by heating a jig | tool main body.

  In this case, the jig body extends in the longitudinal direction and is bent at the center of the width direction orthogonal to the longitudinal direction, and the temperature adjusting unit heats the jig body, thereby It is preferable that both end portions of the are widened in the width direction.

  According to this configuration, the jig main body can be a simple configuration, and the jig main body is heated by the temperature adjusting unit, and both ends in the width direction of the jig main body are spread in the width direction. The gap between the heat transfer tubes can be suitably expanded.

  In this case, the temperature adjusting part is a heater provided along the longitudinal direction of the jig body, and the heater is preferably provided inside a bent part formed by bending the jig body.

  According to this configuration, the jig main body can be heated from the center in the width direction toward the end by providing the heater inside the bent portion at the center in the width direction. For this reason, since the temperature distribution of the heated jig main body can be made uniform, the jig main body can be suitably deformed.

  In this case, the temperature adjustment unit is a flexible thin plate-like flat heater, and the flat heater is preferably provided over the entire inside of the bent jig body.

  According to this configuration, the jig body can be heated uniformly over the entire body, so that the jig body can be heated with a small amount of heat, and the jig body can be suitably deformed.

  In this case, it is preferable that both ends of the width direction of the jig body are formed in a curved surface.

  According to this configuration, even if both end portions in the width direction of the jig main body are in contact with the heat transfer tube, the gap of the heat transfer tube can be expanded without damaging the heat transfer tube. Moreover, since no cushioning material or the like is used, the jig body can be suitably inserted even when the gap between the heat transfer tubes is narrow.

  In this case, it is preferable that the jig body has an accommodation groove that is formed at least at one end in the width direction and can accommodate the heat transfer tube.

  According to this configuration, when the both ends of the jig body in the width direction are expanded and brought into contact with the heat transfer tubes, and the gap between the heat transfer tubes is expanded, the heat transfer tubes can be accommodated in the accommodation grooves. For this reason, since a jig | tool main body can be positioned with respect to a heat exchanger tube, the clearance gap between heat exchanger tubes can be expanded stably. In addition, the insertion groove is formed in one end portion of the jig body in the width direction, and the other end portion in the width direction of the jig body is formed flat, so that the jig body can be inserted into the gap of the heat transfer tube. The other end can be inserted as a guide.

  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, a jig insertion step of inserting a gap expanding jig into a gap between adjacent heat transfer tubes, and heating the jig main body by the temperature adjusting unit, and expanding the gap by the jig main body. A gap expanding step, a member inserting step of inserting a vibration suppression member into the expanded gap, an extension releasing step of cooling the jig body to release the gap expansion by the jig body, and pulling out the gap expanding jig from the gap And a jig drawing step.

  According to this configuration, the clearance between the heat transfer tubes can be expanded using the clearance expansion jig, and the vibration suppressing member can be inserted into the expanded clearance of the heat transfer tubes. For this reason, a vibration suppression member can be inserted suitably.

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 perspective view of the gap extending jig before heating according to the first embodiment. FIG. 7 is a perspective view of the gap extending jig after heating according to 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 an explanatory diagram of an example related to a method of arranging a vibration suppression member using the gap extending jig of the first embodiment. FIG. 14 is a flowchart regarding a method of arranging the vibration suppressing member. FIG. 15 is a perspective view of the gap extending jig according to the second embodiment. FIG. 16 is a cross-sectional view of the jig body of the gap extending jig according to the third embodiment. FIG. 17 is a plan view of the gap extending jig according to the fourth embodiment. FIG. 18 is a cross-sectional view of the jig main body before the gap extending jig according to the fifth embodiment is deformed. FIG. 19 is a cross-sectional view of the jig main body after the gap extending jig according to the fifth embodiment is deformed. FIG. 20 is a cross-sectional view of the jig main body before the gap extending jig according to the sixth embodiment is deformed. FIG. 21 is a cross-sectional view of the jig main body after the gap extending jig according to the sixth embodiment is deformed.

  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 FIGS. FIG. 6 is a perspective view of the gap extending jig before heating according to the first embodiment. FIG. 7 is a perspective view of the gap extending jig after heating 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 main body 81 and a heater (temperature adjusting unit) 82. The jig body 81 is configured using a shape memory alloy. The jig body 81 has a shape obtained by bending a plate-like shape memory alloy extending in the longitudinal direction at the center in the width direction orthogonal to the longitudinal direction, and the cross section viewed from the longitudinal direction is a U-shape. ing. That is, the jig body 81 has a bent portion 81a that extends in the longitudinal direction and bends in the center in the width direction, and a pair of end portions 81b that protrude from both sides in the width direction of the bent portion 81a. The bent portion 81a is formed to be curved. Further, the jig body 81 has a length in the longitudinal direction from the outermost heat transfer tube 5 to the innermost heat transfer tube 5 of the heat transfer tube layer 5A.

  The jig body 81 has the shape shown in FIG. 6 before heating, but the shape shown in FIG. 7 after heating. In other words, the jig body 81 has a shape in which a pair of end portions (both end portions) 81b expands around the bent portion 81a after heating, and a cross section viewed from the longitudinal direction has a V shape. The heat transfer tube 5 is in contact with the tip of the end portion 81b of the jig body 81 that is heated and expanded. The shape of the jig body 81 is memorized so as to be smaller than the gap between the heat transfer tube layers 5A before heating and larger than the gap between the heat transfer tube layers 5A after heating.

  The heater 82 heats the jig body 81. The heater 82 is formed in a rod shape, and is attached in contact with the inside of the bent portion 81a along the bent portion 81a of the jig body 81 extending in the longitudinal direction. For this reason, the heater 82 heats the jig body 81 uniformly along its longitudinal direction, and heats the jig body 81 from the center (bending portion 81a) in the width direction toward both end portions 81b.

  Next, with reference to FIG. 8 to FIG. 14, an arrangement method of 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. FIGS. 8 to 13 are explanatory diagrams of an example regarding a method of arranging the vibration suppressing member using the gap extending jig of the first embodiment. FIG. 14 is a flowchart regarding a method of arranging the vibration suppressing member. As shown in FIG. 8, 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. 8, 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 on the existing steam generator 1, first, the jig body 81 before heating is inserted into a predetermined gap of the heat transfer tube 5 as shown in FIG. (Jig insertion step: Step S1 in FIG. 14). In the jig insertion step S1, the jig body 81 is inserted through the insertion path shown in FIG. In the jig insertion step S1, the bending portion 81a of the jig main body 81 has the first vibration so that the pair of end portions 81b of the jig main body 81 is located at the center between the adjacent first vibration suppressing members 14A. The jig body 81 is inserted so as to be positioned on the suppressing member 14A side.

  After the jig body 81 is inserted, the jig body 81 is heated by the heater 82 as shown in FIG. When the jig body 81 is heated, the pair of end portions (both end portions) 81b spread around the bent portion 81a of the jig body 81 so that the tips of the pair of end portions 81b come into contact with the heat transfer tube 5. Then, the gap between the heat transfer tubes 5 (heat transfer tube layer 5A) is expanded (gap expansion step: step S2 in FIG. 14). When the gap between the heat transfer tubes 5 is expanded, as shown in FIG. 11, the second vibration suppressing member 14B is inserted with the gap expanded (member insertion step: step S3 in FIG. 14). The second vibration suppressing member 14 </ b> B is formed to have the same width as the gap of the heat transfer tube 5 or slightly wider than the gap of the heat transfer tube 5.

  When the second vibration suppressing member 14B is inserted, the heating of the jig body 81 by the heater 82 is stopped. For this reason, the jig body 81 is naturally cooled. When the jig main body 81 is cooled, as shown in FIG. 12, the jig main body 81 is released from the expansion of the gap of the heat transfer tube 5 by narrowing the pair of end portions 81b around the bent portion 81a. (Expansion cancellation step: Step S4 in FIG. 14). 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. As shown in FIG. 13, the jig body 81 with the pair of end portions 81 b narrowed 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: step S5 in FIG. 14). Thereby, the additional installation of the second vibration suppressing member 14B is completed. By repeating these steps, a plurality of second vibration suppressing members 14B are additionally provided.

  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 can deform the jig main body 81 so as to expand the gap between the heat transfer tubes 5 by heating the jig main body 81 with the heater 82. Since the second vibration suppressing member 14B can be inserted into the gap between the heat transfer tubes 5 in a state where the gap between the heat transfer tubes 5 is expanded, the second vibration suppressing member 14B can be preferably inserted. 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 jig | tool main body 81 can be made smaller than the clearance gap between the heat exchanger tubes 5 before a heating, and can be made larger than the clearance gap between the heat exchanger tubes 5 after a heating. For this reason, the jig body 81 before heating can be easily inserted into the gap between the heat transfer tubes 5. In addition, the gap between the heat transfer tubes 5 can be reliably expanded by heating the jig main body 81.

  Moreover, according to the structure of Example 1, the jig main body 81 can be heated toward the edge part from the center of the width direction by providing the heater 82 inside the bending part 81a of the center of the width direction. For this reason, since the temperature distribution of the heated jig body 81 can be made uniform, the jig body 81 can be suitably deformed.

  In the first embodiment, the jig body 81 is made of a shape memory alloy, but this is not a limitation. For example, the bending portion 81a of the jig body 81 may be made of a shape memory alloy, and the portion other than the bending portion 81a may be made of another material.

  In the first embodiment, the jig body 81 is formed in a U-shaped cross section. However, the jig body 81 is not limited to this configuration as long as the gap between the heat transfer tubes 5 can be expanded. You may form in a letter shape.

  In the first embodiment, the jig body 81 is heated using the heater 82. However, a temperature adjusting mechanism capable of heating and cooling may be provided instead of the heater 82. In this case, since the jig body 81 can be actively cooled, the jig body 81 can be cooled more quickly than natural cooling. For this reason, the jig main body 81 can be narrowed more quickly, and it becomes possible to shorten the time of the expansion cancellation | release process which cancels | releases the expansion of the clearance gap between the heat exchanger tubes 5. FIG.

  Moreover, in Example 1, although the bending part 81a of the jig | tool main body 81 was curved and formed, you may be formed by bending not only in this structure.

  Next, a gap expanding 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. 15 is a perspective view of the gap extending jig according to the second embodiment. In the gap expanding jig 80 according to the first embodiment, the jig main body 81 is heated by disposing the rod-shaped heater 82 inside the bending portion 81a. A thin plate-like flat heater 102 is disposed on the entire inner side to heat the jig body 101. Hereinafter, the gap extending jig 100 according to the second embodiment will be described with reference to FIG.

  As illustrated in FIG. 15, the gap extending jig 100 according to the second embodiment includes a jig main body 101 and a flat heater (temperature adjusting unit) 102. Since the jig body 101 has the same configuration as that of the first embodiment, the description thereof is omitted. The flat heater 102 heats the jig main body 101. The flat heater 102 is formed in a flexible thin plate shape, and is attached in contact with the entire area inside the bent jig body 101. For this reason, the flat heater 102 heats the inside of the jig body 101 uniformly over the longitudinal direction and the width direction.

  As described above, according to the configuration of the second embodiment, the heat distribution can be made uniform by uniformly heating the inside of the jig body 101 with the flat heater 102 over the whole, so that the amount of heat is small. Thus, the jig body 101 can be heated, and the jig body 101 can be suitably deformed.

  Next, with reference to FIG. 16, the gap extending jig 110 according to the third embodiment will be described. 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. 16 is a cross-sectional view of the jig body of the gap extending jig according to the third embodiment. In the gap extending jig 110 according to the third embodiment, the tips of the pair of end portions 81b of the jig main body 81 according to the first embodiment are curved. Hereinafter, with reference to FIG. 16, the gap extending jig 110 according to the third embodiment will be described.

  As shown in FIG. 16, the jig main body 111 of the gap extending jig 110 according to the third embodiment has a U-shaped cross section viewed from the longitudinal direction, as in the first embodiment. And a pair of end portions 111b. Each end 111b has a curved tip at the protruding direction in contact with the heat transfer tube 5. For this reason, the tip of each end 111b is formed in a semicircular shape whose cross section viewed from the longitudinal direction is convex on the protruding side.

  As described above, according to the configuration of the third embodiment, the jig body 111 is heated and the pair of end portions 111b spread in the width direction, so that the tips of the end portions 111b of the jig body 111 are heat transfer tubes. Even if it contacts 5, the gap between the heat transfer tubes 5 can be expanded without damaging the heat transfer tubes 5. At this time, since no buffer material or the like is used, the jig main body 111 can be suitably inserted even when the gap between the heat transfer tubes 5 is narrow. In addition, at least the part which contacts the heat exchanger tube 5 should just be a curved surface.

  Next, with reference to FIG. 17, a gap expanding jig 120 according to the fourth embodiment will be described. In the fourth embodiment, only parts different from the first embodiment will be referred to in order to avoid overlapping with the first embodiment. FIG. 17 is a plan view of the gap extending jig according to the fourth embodiment. The gap extending jig 120 according to the fourth embodiment has a housing groove 125 provided at one end 81b of the jig body 81 according to the first embodiment. Hereinafter, with reference to FIG. 17, the gap expansion jig 120 of Example 4 will be described.

  The jig main body 121 of the gap extending jig 120 of the fourth embodiment has a U-shaped cross section viewed from the longitudinal direction as in the first embodiment, and includes a bent portion 121a and a pair of end portions 121b. Have. As shown in FIG. 17, among the pair of end portions 121b, a plurality of receiving grooves 125 are formed on the outer surface of one end portion 121b, while the outer surface of the other end portion 121b is It is flat.

  The plurality of receiving grooves 125 are provided at predetermined intervals along the longitudinal direction of the jig main body 121. Specifically, the plurality of housing grooves 125 are provided corresponding to the plurality of heat transfer tubes 5 arranged in the radial direction of the radius of curvature in the heat transfer tube layer 5A. Each housing groove 125 is formed so as to extend in a direction orthogonal to the longitudinal direction of the jig main body 121, and is in the same direction as the axial direction of the heat transfer tube 5 that is in contact with heating (expansion). It is formed to become. Each housing groove 125 is formed to be recessed with respect to the surface of the jig body 121 and has a curved surface in a cross section orthogonal to the extending direction. Each housing groove 125 is preferably formed to have a curved surface larger than the outer diameter of the heat transfer tube 5.

  In the jig body 121 configured as described above, in the jig insertion step S1, the other flat end 121b on which the housing groove 125 is not formed is pressed against the heat transfer tube 5, and the other end 121b is pressed. While being a guide, it is inserted into the gap between the heat transfer tubes 5.

  As described above, according to the configuration of the fourth embodiment, when the both ends 121b in the width direction of the jig main body 121 are expanded and brought into contact with the heat transfer tube 5, and the gap between the heat transfer tubes 5 is expanded, the heat transfer tubes 5 are It can be accommodated in the accommodation groove 125. For this reason, since the jig | tool main body 121 can be positioned with respect to the heat exchanger tube 5, the clearance gap between the heat exchanger tubes 5 can be expanded stably.

  Further, according to the configuration of the fourth embodiment, the housing groove 125 is formed in the one end 121b in the width direction of the jig main body 121, and the other end 121b in the width direction of the jig main body 121 is formed flat. When the heat transfer tube 5 is inserted into the gap, the other end 121b of the jig body 121 can be inserted as a guide. For this reason, even when the plurality of receiving grooves 125 are formed, the resistance when the jig body 121 is inserted can be suppressed.

  Next, with reference to FIGS. 18 and 19, a gap extending jig 130 according to the fifth embodiment will be described. In the fifth embodiment, only parts different from the first embodiment are referred to in order to avoid the description overlapping with the first embodiment. FIG. 18 is a cross-sectional view of the jig main body before the gap extending jig according to the fifth embodiment is deformed. FIG. 19 is a cross-sectional view of the jig main body after the gap extending jig according to the fifth embodiment is deformed. In the gap expanding jig 80 of the first embodiment, the jig main body 81 is formed in a U-shaped cross section, but in the gap expanding jig 130 of the fifth embodiment, the jig main body 131 is formed in a circular cross section. Hereinafter, with reference to FIG.18 and FIG.19, the clearance gap expansion jig | tool 130 of Example 5 is demonstrated.

  As illustrated in FIG. 18, the gap extending jig 130 according to the fifth embodiment includes a jig body 131 and a temperature adjustment unit 132. Here, the temperature adjustment unit 132 is, for example, a flat heater 132. The jig body 131 is formed in a cylindrical shape using a shape memory alloy, and is formed extending in the longitudinal direction as an axial direction. For this reason, the jig body 131 has a circular cross section cut by a plane orthogonal to the longitudinal direction. The diameter of the jig body 131 is smaller than the gap between the heat transfer tube layers 5A.

  The jig body 131 has the shape shown in FIG. 18 before heating, but the shape shown in FIG. 19 after heating. That is, the jig main body 131 has an elliptical cross section cut by a plane orthogonal to the longitudinal direction after heating. At this time, the major axis of the jig body 131 having an elliptical cross section is a direction in which the heat transfer tube 5 is opposed, and the minor axis of the jig body 131 is a direction orthogonal to the direction in which the heat transfer tube 5 is opposed. Become. For this reason, the heated jig main body 131 has its long axis portion in contact with the heat transfer tube 5 to expand the gap between the heat transfer tubes 5. Therefore, the shape of the jig body 131 is memorized so as to be smaller than the gap between the heat transfer tube layers 5A before heating and larger than the gap between the heat transfer tube layers 5A after heating.

  The flat heater 132 is for heating the jig body 131. The flat heater 132 is formed in a thin plate shape having flexibility, and is attached in contact with the entire inner peripheral surface of the cylindrical jig body 131. For this reason, the flat heater 132 uniformly heats the inner peripheral surface of the jig body 131. Instead of the flat heater 132, the rod-shaped heater shown in the first embodiment may be applied.

  As described above, according to the configuration of the fifth embodiment, since the inner peripheral surface of the jig body 131 is uniformly heated by the flat heater 132, the circular cross section can be deformed to the elliptical cross section. The gap between the heat tubes 5 can be suitably expanded.

  Next, with reference to FIG. 20 and FIG. 21, a gap expanding jig 140 according to the sixth embodiment will be described. In the sixth embodiment as well, only parts different from the first embodiment will be mentioned in order to avoid the description overlapping with the first embodiment. FIG. 20 is a cross-sectional view of the jig main body before the gap extending jig according to the sixth embodiment is deformed. FIG. 21 is a cross-sectional view of the jig main body after the gap extending jig according to the sixth embodiment is deformed. In the gap expanding jig 80 of the first embodiment, the jig main body 81 is formed in a U-shaped cross section, but in the gap expanding jig 140 of the sixth embodiment, the jig main body 141 is formed in a plate shape. Hereinafter, with reference to FIG.20 and FIG.21, the gap expansion jig | tool 140 of Example 6 is demonstrated.

  As illustrated in FIG. 20, the gap extending jig 140 according to the sixth embodiment includes a jig main body 141 and a temperature adjusting unit 142. Here, the temperature adjustment unit 142 is, for example, a flat heater 142. The jig main body 141 is a plate-shaped shape memory alloy extending in the longitudinal direction. For this reason, the jig body 141 has a rectangular cross section cut by a plane orthogonal to the longitudinal direction. The thickness of the jig body 141 is smaller than the gap between the heat transfer tube layers 5A.

  The jig body 141 has the shape shown in FIG. 20 before heating, but the shape shown in FIG. 21 after heating. That is, the jig main body 141 has a corrugated cross section cut by a plane orthogonal to the longitudinal direction after heating. Specifically, the jig body 141 is formed in a transverse wave corrugated shape that proceeds in a direction orthogonal to the direction in which the heat transfer tubes 5 face each other, and the top of the jig body 141 having a cross-sectional wave shape is formed on the heat transfer tubes 5. The gap between the heat transfer tubes 5 is expanded. Therefore, the shape of the jig main body 141 is memorized so as to be smaller than the gap between the heat transfer tube layers 5A before heating and larger than the gap between the heat transfer tube layers 5A after heating.

  The flat heater 142 heats the jig main body 141. The flat heater 142 is formed in a flexible thin plate shape, and is attached in contact with a portion other than the top portion of the jig body 141 having a cross-sectional wave shape, that is, a portion other than a portion that contacts the heat transfer tube 5. It has been. Instead of the flat heater 142, the rod-shaped heater shown in the first embodiment may be applied.

  As described above, according to the configuration of the sixth embodiment, the jig main body 141 can be deformed from the plate shape to the corrugated plate shape by heating the jig main body 141 with the flat heater 142. This gap can be suitably expanded.

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 81a Bending part 81b End part 82 Heater 100 Gap expanding jig (Example 2)
101 Jig body (Example 2)
102 Flat heater (Example 2)
110 Gap expansion jig (Example 3)
111 Jig body (Example 3)
111a Bending part (Example 3)
111b end (Example 3)
120 Gap expansion jig (Example 4)
121 Jig body (Example 4)
121a Bending part (Example 4)
121b end (Example 4)
125 accommodation groove 130 gap expansion jig (Example 5)
131 Jig body (Example 5)
132 Flat heater (Example 5)
140 Gap expansion jig (Example 6)
141 Jig body (Example 6)
142 Flat heater (Example 6)

Claims (8)

A jig body including a shape memory material that is disposed in a gap between adjacent heat transfer tubes and is deformed so that the gap can be expanded by heating,
And a temperature adjusting part capable of adjusting the temperature of the jig main body.   2. The heat transfer tube according to claim 1, wherein the jig main body is smaller than the gap before being heated by the temperature adjusting unit, and is larger than the gap after being heated by the temperature adjusting unit. Gap expansion jig. The jig body extends in the longitudinal direction and is bent at the center in the width direction orthogonal to the longitudinal direction,
3. The heat transfer tube according to claim 1, wherein the temperature adjustment unit heats the jig body to widen both ends of the jig body in the width direction in the width direction. Gap expansion jig. The temperature adjusting unit is a heater provided along the longitudinal direction of the jig body.
The said heater is provided inside the bending part formed by bending the said jig | tool main body, The clearance gap expansion jig of the heat exchanger tube of Claim 3 characterized by the above-mentioned. The temperature adjusting unit is a thin flat heater having flexibility,
The said flat heater is provided over the whole inside of the bent said jig | tool main body, The clearance gap expansion jig of the heat exchanger tube of Claim 3 characterized by the above-mentioned.   The gap extension jig for a heat transfer tube according to any one of claims 3 to 5, wherein the jig main body has both ends in the width direction formed into curved surfaces.   The gap of the heat transfer tube according to any one of claims 3 to 6, wherein the jig main body has an accommodation groove formed at least at one end portion in the width direction and capable of accommodating the heat transfer tube. Expansion jig. A vibration suppressing member for suppressing vibration of the heat transfer tube is disposed in the gap between the adjacent heat transfer tubes using the heat transfer tube gap extending jig according to any one of claims 1 to 7. An arrangement method of the vibration suppressing member,
A jig insertion step of inserting the gap expansion jig into the gap between the adjacent heat transfer tubes;
A gap extending step of heating the jig body by the temperature adjusting unit and extending the gap by the jig body;
A member insertion step of inserting the vibration suppressing member into the expanded gap;
An extension releasing step of cooling the jig body and releasing the expansion of the gap by the jig body,
And a jig extracting step of extracting the gap expanding jig from the gap.