Patent Publication Number: US-11384652-B2

Title: Steam turbine and method of manufacturing steam turbine

Description:
BACKGROUND 
     Field 
     The present disclosure relates to a steam turbine and a method of manufacturing a steam turbine. 
     Priority is claimed on Japanese Patent Application No. 2018-148626, filed on Aug. 7, 2018, the content of which is incorporated herein by reference. 
     Description of Related Art 
     A steam turbine includes a rotor that rotates centering on an axis and a casing that covers the rotor. The rotor includes a rotor shaft extending in an axial direction centering on the axis, and a plurality of rotor blades disposed around the rotor shaft. In the casing, a diaphragm having a plurality of nozzles (nozzles) disposed around the rotor is fixed on an upstream side of each rotor blade. Such a steam turbine has a structure in which a cylindrical casing and an annular diaphragm are divided up and down from the viewpoint of assembly and the like. 
     In Patent Document 1, a steam turbine is described which includes a rotor to which a rotor blade is attached, a divided nozzle diaphragm that holds a nozzle and is capable of being divided up and down, a ring-shaped inner casing that holds the divided nozzle diaphragm, and an outer casing that accommodates the inner casing inside thereof. The inner casing is divided into stages such that a plurality of ring-shaped members are aligned in an axial direction, and is accommodated in the outer casing which is capable of being divided up and down. 
     REFERENCE 
     Patent Document 
     [Patent Document 1] Japanese Patent No. 4507877 
     SUMMARY 
     Problems to be Solved 
     In a case of assembling the steam turbine having a structure in which the casing and the diaphragm are divided up and down, with an upper half casing being a ceiling, an upper half diaphragm is disposed, a lower half diaphragm is disposed with respect to a lower half casing, and then components are disposed in the order of the rotor and the upper half casing. In a case where the steam turbine is maintained or disassembled, conversely, the components are removed in the order of the upper half casing, the upper half diaphragm, the rotor, and the lower half diaphragm. Therefore, it takes a lot of time to complete the disassembly or assembly of the steam turbine. Furthermore, as the steam turbine becomes larger, work can be expensive and may take weeks each time. Therefore, it is desirable to perform the assembly in a short time. 
     The present disclosure provides a steam turbine and a method of manufacturing a steam turbine that can reduce assembly time. 
     Means to Solve the Problems 
     A steam turbine according to a first aspect of the present disclosure includes: a casing which is divided into an upper half casing on an upper side in a vertical direction and a lower half casing on a lower side in the vertical direction by a dividing surface, and which has a cylindrical shape open at both ends; and a bundle which is accommodated in the casing such that both ends thereof protrude from an opening of the casing. The bundle includes a rotor rotatable centering on an axis, a plurality of diaphragms which have a ring shape covering the rotor from an outside in a radial direction relative to the axis, and are divided into upper half diaphragms on the upper side in the vertical direction and lower half diaphragms on the lower side in the vertical direction by a dividing surface, a bundle casing which has a cylindrical shape covering the rotor and the plurality of the diaphragms from the outside in the radial direction, and to which the plurality of the diaphragms are fixed inside thereof, a bearing portion which is fixed to an inside of the bundle casing on an outside of the plurality of the diaphragms in the axial direction in which the axis extends, and rotatably supports the rotor, and a seal portion which is fixed to the inside of the bundle casing between the plurality of the diaphragms and the bearing portion in the axial direction, and seals between an outer peripheral surface of the rotor and an inner peripheral surface of the bundle casing. The bundle casing is detachably attached to the casing in a state of holding the rotor, the plurality of the diaphragm, the bearing portion, and the seal portion. 
     According to such a configuration, the rotor, the diaphragm, the bearing portion, and the seal portion are held by the bundle casing, and are an integrated component as a bundle. Therefore, the rotor, the diaphragm, the bearing portion, and the seal portion can be moved together only by moving the bundle. Therefore, when the components of the steam turbine are moved, work time can be greatly reduced. 
     In addition, in the steam turbine according to a second aspect of the present disclosure, in the first aspect, a position of the bearing portion in the axial direction may be disposed at a position deviated from a position of the casing in the axial direction. 
     According to such a configuration, it is possible to separate, in the axial direction, a position of the bearing portion which is in an oil atmosphere where lubricating oil is used and a position of a region through which high-temperature steam flows. Therefore, it is possible to suppress an occurrence of a defect caused by the lubricating oil due to the heat of the steam in the bundle. 
     In addition, in the steam turbine according to a third aspect of the present disclosure, in the first or second aspect, the casing may include a casing inlet port through which a working fluid flows in from an outside of the casing into an inside of the casing, and a casing exhaust port through which the working fluid circulating the inside of the casing discharges to the outside of the casing. The bundle casing may include a bundle inlet hole communicating with the casing inlet port and a bundle exhaust hole communicating with the casing exhaust port. 
     According to such a configuration, it is possible to almost form a path through which the steam flowing in from the casing inlet port and discharging from the casing exhaust port flows with components in the bundle. Therefore, after the bundle is attached to the lower half casing and upper half casing, there is no need to finely adjust internal components for efficient flow of steam. Therefore, when the components of the steam turbine are assembled, work can be further shortened. 
     In addition, a method of manufacturing a steam turbine according to a fourth aspect of the present disclosure includes: an internal component preparation step of preparing a rotor rotatable centering on an axis, a plurality of diaphragms which have a ring shape covering the rotor from an outside in a radial direction relative to the axis, and are divided into upper half diaphragms on an upper side in a vertical direction and lower half diaphragms on a lower side in the vertical direction by a dividing surface, a bundle casing which has a cylindrical shape covering the rotor and the plurality of the diaphragms from the outside in the radial direction, and to which the plurality of the diaphragms are fixed inside thereof, a bearing portion which is fixed to an inside of the bundle casing on an outside of the plurality of the diaphragms in the axial direction in which the axis extends, and rotatably supports the rotor, and a seal portion which is fixed to the inside of the bundle casing between the plurality of the diaphragms and the bearing portion in the axial direction and seals between an outer peripheral surface of the rotor and an inner peripheral surface of the bundle casing; a bundle preparation step of disposing the rotor in the inside of the bundle casing and fixing the plurality of the diaphragms, the bearing portion, and the seal portion to the inside of the bundle casing in a state where the rotor is covered from the outside in the radial direction to prepare the bundle, after the internal component preparation step; a casing preparation step of preparing a casing which is divided into an upper half casing on the upper side in the vertical direction and a lower half casing on the lower side in the vertical direction by a dividing surface, and which has a cylindrical shape open at both ends; a bundle disposition step of lowering the bundle from on the upper side in the vertical direction with respect to the lower half casing, and disposing the lower half diaphragm on an inner peripheral side of the lower half casing, after the casing preparation step; and an upper half casing disposition step of lowering the upper half casing from on the upper side in the vertical direction with respect to the lower half casing, disposing the upper half diaphragm on the inner peripheral side of the upper half casing, and causing a dividing surface of the upper half casing and a dividing surface of the lower half casing to come into contact with each other, after the bundle disposition step. 
     Effects 
     According to the present disclosure, an assembly time can be shortened. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a sectional view of a steam turbine according to an embodiment of the present disclosure. 
         FIG. 2  is a flowchart of a method of manufacturing a steam turbine of an embodiment of the present disclosure. 
         FIG. 3  is a perspective view of a main portion for explaining an axial position-fixing jig in a bundle of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, a steam turbine  1  of an embodiment of the present disclosure will be explained in detail with reference to drawings. 
     As illustrated in  FIG. 1 , the steam turbine  1  includes a casing  2 , a bundle  10 , and a bearing pedestal  3 . 
     In the following, a direction in which an axis Ar of a rotor  11  described later extends is taken as an axial direction Da. A radial direction relative to the axis Ar as a reference is simply referred to as a radial direction Dr. In the radial direction Dr, upward on a paper surface of  FIG. 1  is taken as a vertical direction Dv. Further, a horizontal direction in  FIG. 1  is taken as a horizontal direction Dh orthogonal to the vertical direction Dv. Further, a direction around the rotor  11  centering on the axis Ar is taken as a circumferential direction Dc. 
     The casing  2  is disposed to cover a bundle  10  from an outer peripheral side. The casing  2  has a cylindrical shape of which both ends are open centering on a central axis disposed identical to the axis Ar of a rotor  11  described later. The casing  2  is provided with a casing inlet port  25  for guiding steam to an internal steam flow path, and a casing exhaust port  26  for discharging the steam flowing through the steam flow path to the outside. The casing  2  includes an upper half casing  21  on an upper side and a lower half casing  22  on a lower side in the vertical direction Dv with the axis Ar as the reference of the rotor  11 . 
     The upper half casing  21  extends in the circumferential direction Dc. The upper half casing  21  has a cross section orthogonal to the axis Ar having a semicircular ring shape centering on the axis Ar. The upper half casing  21  is open downward in the vertical direction Dv so that an upper half of the bundle  10  is capable of being accommodated. The upper half casing  21  includes dividing surfaces (upper half casing dividing surface) at both ends in the circumferential direction Dc. The dividing surface of the upper half casing  21  is a horizontal surface facing downward in the vertical direction Dv. 
     The lower half casing  22  extends in the circumferential direction Dc. The lower half casing  22  has a cross section orthogonal to the axis Ar having a semicircular ring shape centering on the axis Ar. An inner diameter of the lower half casing  22  is formed to have the same size as an inner diameter of the upper half casing  21 . The lower half casing  22  is open upward in the vertical direction Dv so that a lower half of the bundle  10  is capable of being accommodated. The lower half casing  22  includes dividing surfaces (lower half casing dividing surfaces) at both ends in the circumferential direction Dc. The dividing surface of the lower half casing  22  is a horizontal surface facing upward in the vertical direction Dv. The upper half casing  21  is placed on the upper side in the vertical direction Dv with respect to the lower half casing  22 , and is fixed by fastening members such as bolts (not illustrated) in a state where the dividing surfaces are in contact with each other. Thus, the casing  2  is formed. 
     The bundle  10  is accommodated in the casing  2 . The bundle  10  of the present embodiment includes the rotor  11 , a plurality of diaphragms  12 , a bundle casing  13 , a plurality of bearing portions  14 , a plurality of oil-slinger portions  15 , and a plurality of seal portions  16 . In the bundle  10 , the rotor  11 , the diaphragm  12 , the bundle casing  13 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  are integrally formed to be movable state with respect to the casing  2 . In the bundle  10 , relative positions of the rotor  11 , the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  with respect to the bundle casing  13  are held in an immovable state. Both ends of the bundle  10  protrude from openings formed at both ends of the casing  2  in the axial direction Da. 
     The rotor  11  is rotatable centering on an axis Ar. The rotor  11  includes a rotor shaft  111  extending in the axial direction Da centering on the axis Ar, and a plurality of rotor blades  112  aligned in the circumferential direction Dc with respect to the rotor shaft  111  and fixed to the rotor shaft  111 . 
     The diaphragm  12  is disposed on the outer peripheral side of the rotor shaft  111 . The diaphragm  12  has a ring shape centering on the axis Ar. A plurality of diaphragms  12  are disposed apart in the axial direction Da. The outer peripheral portion of the diaphragm  12  which is on the outside in the radial direction Dr is fixed to the bundle casing  13 . A plurality of nozzles (nozzles)  125  aligned in the circumferential direction Dc are provided near a middle of the ring-shaped diaphragm  12  in the radial direction Dr. The nozzle  125  is disposed at a position upstream of the rotor blade  112  of the rotor  11  in the axial direction Da. In the steam turbine  1 , a cylindrical space in the vicinity of the outer peripheral side of the rotor shaft  111  and the middle of the annular diaphragm  12 , in other words, a space in which the rotor blades  112  and the nozzles  125  are disposed is a steam flow path through which steam as a working fluid flows. The ring-shaped diaphragm  12  includes an upper half diaphragm  121  on the upper side and a lower half diaphragm  122  on the lower side in the vertical direction Dv with respect to the axis Ar of the rotor  11 . 
     The upper half diaphragm  121  extends in the circumferential direction Dc. The upper half diaphragm  121  is fixed to the upper half casing  21  in a state of being accommodated inside the upper half casing  21 . The upper half diaphragm  121  has a cross section orthogonal to the axis Ar, having a semicircular ring shape centering on the axis Ar. The upper half diaphragm  121  is open downward in the vertical direction Dv so that the rotor  11  can be fitted. The upper half diaphragm  121  has dividing surfaces (upper half diaphragm dividing surfaces) at both ends in the circumferential direction Dc. The dividing surface of the upper half diaphragm  121  is a horizontal surface facing downward in the vertical direction Dv. 
     The lower half diaphragm  122  extends in the circumferential direction Dc. The lower half diaphragm  122  is fixed to the lower half casing  22  in a state of being accommodated inside the lower half casing  22 . The lower half diaphragm  122  has a cross section orthogonal to the axis Ar, having a semicircular ring shape centering on the axis Ar. The lower half diaphragm  122  is open upward in the vertical direction Dv so that the rotor  11  can be fitted. The lower half diaphragm  122  has dividing surfaces (lower half diaphragm dividing surfaces) at both ends in the circumferential direction Dc. The dividing surface of the lower half diaphragm  122  is a horizontal surface facing upward in the vertical direction Dv. The upper half diaphragm  121  is placed on the upper side in the vertical direction Dv with respect to the lower half diaphragm  122 , and is fixed by fastening members (not illustrated) such as bolts in a state where the dividing surfaces are in contact with each other. Therefore, the diaphragm  12  is formed. 
     The bundle casing  13  has a cylindrical shape that covers the rotor  11 , the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  from the outside in the radial direction Dr. Openings are formed at both ends of the bundle casing  13  in the axial direction Da. The bundle casing  13  is formed such that a length in the axial direction Da is shorter than that of the rotor shaft  111 . Therefore, the rotor shaft  111  protrudes from the openings at both ends in the axial direction Da. The bundle casing  13  is formed such that a length in the axial direction Da is longer than that of the casing  2 . Therefore, the end portion in the axial direction Da protrudes from the opening of the casing  2 . The bundle casing  13  can be attached and detached to and from the casing  2  in a state of holding the components (rotor  11 , diaphragm  12 , bearing portion  14 , oil-slinger portion  15 , and seal portion  16 ) accommodated on the inside thereof. The bundle casing  13  is fixed to the casing  2  in a state of being accommodated in the casing  2  when the steam turbine  1  is in operation. The bundle casing  13  can be divided up and down with the horizontal surface as a reference passing through the axis Ar. The bundle casing  13  can be divided into an upper half bundle casing  131  and a lower half bundle casing  132 . The upper half diaphragm  121  is fixed to the inside of the upper half bundle casing  131 . The lower half diaphragm  122  is fixed to the inside of the lower half bundle casing  132 . The bundle casing  13  includes a bundle inlet hole  135  communicating with the casing inlet port  25 , a bundle exhaust hole  136  communicating with the casing exhaust port  26 , and a bundle groove portion  137  recessed from the outer peripheral surface. 
     The bundle inlet hole  135  is formed to penetrate the bundle casing  13  in the radial direction Dr. The bundle exhaust hole  136  is formed to penetrate the bundle casing  13  in the axial direction Da. The steam flowed into the casing  2  from the casing inlet port  25  flows into the bundle casing  13  from the bundle inlet hole  135 . The steam flowed into the bundle casing  13  flows through the steam flow path, flows into the casing exhaust port  26  from the bundle exhaust hole  136 , and is discharged to the outside of the casing  2 . The bundle groove portion  137  is a groove which is recessed from the outer peripheral surface of the bundle casing  13  so as to have a rectangular cross section. The bundle groove portion  137  is formed at two positions separated in the axial direction Da so as to correspond to a position of the bearing pedestal  3  described later. 
     The bearing portion  14  rotatably supports the rotor shaft  111  centering on the axis Ar. The bearing portion  14  is fixed in a state of being accommodated in the bundle casing  13 . The position of the bearing portion  14  in the axial direction Da is a position (position not overlapping with the casing  2 ) deviated from the position of the casing  2  in the axial direction Da. That is, the bearing portion  14  is disposed outside the diaphragm  12  and the casing  2  in the axial direction Da. The bearing portion  14  includes a first bearing portion  141  and a second bearing portion  142 . 
     The first bearing portion  141  is provided on one side (upstream side of the steam turbine  1 ) in the axial direction Da with respect to the casing  2 . The first bearing portion  141  supports the rotor  11  using lubricating oil. The first bearing portion  141  of the present embodiment is a journal bearing  145  and a thrust bearing  146  of a type that uses lubricating oil. The journal bearing  145  receives a load in the radial direction Dr, acting on the rotor shaft  111 . The thrust bearing  146  receives a load in the axial direction Da, acting on the rotor shaft  111 . The thrust bearing  146  is disposed on one side of the journal bearing  145  in the axial direction Da. The first bearing portion  141  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The first bearing portion  141  can be divided into an upper half first bearing portion  141   a  and a lower half first bearing portion  141   b.    
     The second bearing portion  142  is provided on the other side (downstream side of the steam turbine  1 ) in the axial direction Da with respect to the casing  2 . The second bearing portion  142  supports the rotor  11  using lubricating oil. The second bearing portion  142  in the present embodiment is a journal bearing  145  of a type that uses lubricating oil. The journal bearing  145  which is the second bearing portion  142  is the same as the journal bearing  145  of the first bearing portion  141 . The second bearing portion  142  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The second bearing portion  142  can be divided into an upper half second bearing portion  142   a  and a lower half second bearing portion  142   b.    
     The oil-slinger portion  15  is fixed to the bundle casing  13  between the diaphragm  12  and the bearing portion  14  in the axial direction Da. Specifically, the position of the oil-slinger portion  15  in the axial direction Da is set to a position (position on the inside in the axial direction Da) closer to the casing  2  than the bearing portion  14 . Further, the position of the oil-slinger portion  15  in the axial direction Da is a position (position not overlapping with the casing  2 ) deviated from the position of the casing  2  in the axial direction Da. The oil-slinger portion  15  is provided with unevenness by oil groove and fins (not illustrated) provided in a gap between the rotor shaft  111  and the bundle casing  13 , and prevents leakage of the lubricating oil using a centrifugal force. That is, the oil-slinger portion  15  suppresses the leakage of the lubricating oil from the bearing portion  14  to the inside in the axial direction Da in the bundle casing  13 . The oil removal part  15  of the present embodiment includes a first oil removal part  151  and a second oil removal part  152 . 
     The first oil-slinger portion  151  is disposed on a side closer to the casing  2  in the axial direction Da than the first bearing portion  141  and at a position which does not overlap the casing  2 . The first oil-slinger portion  151  suppresses the leakage of the lubricating oil from the first bearing portion  141 . The first oil-slinger portion  151  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The first oil-slinger portion  151  can be divided into an upper half first oil-slinger portion  151   a  and a lower half first oil-slinger portion  151   b.    
     The second oil-slinger portion  152  is disposed on the side closer to the casing  2  in the axial direction Da than the second bearing portion  142  and at a position which does not overlap the casing  2 . The second oil-slinger portion  152  suppresses the leakage of the lubricating oil from the second bearing  142 . The second oil-slinger portion  152  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The second oil-slinger portion  152  can be divided into an upper half second oil-slinger portion  152   a  and a lower half second oil-slinger portion  152   b.    
     The seal portion  16  is fixed to the inside of the bundle casing  13  between the diaphragm  12  and the oil-slinger portion  15  in the axial direction Da. The seal portion  16  seals an entire circumference between the outer peripheral surface of the rotor shaft  111  and the inner peripheral surface of the bundle casing  13  to prevent the working fluid from leaking to the oil-slinger portion  15 . As the seal portion  16 , for example, a labyrinth seal is preferable. The seal portion  16  of the present embodiment has a first seal portion  161  and a second seal portion  162 . 
     The first seal portion  161  is disposed on the inside in the axial direction Da with respect to the first oil-slinger portion  151  and at a position which overlaps the casing  2  in the axial direction Da. The first seal portion  161  suppresses leakage of steam from the upstream of the steam flow path. The first seal portion  161  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The first seal portion  161  can be divided into an upper half first seal portion  161   a  and a lower half first seal portion  161   b.    
     The second seal portion  162  is disposed on the inside in the axial direction Da with respect to the second oil-slinger portion  152  and at a position which overlaps the casing  2  in the axial direction Da. The first seal portion  161  suppresses leakage of steam from the downstream of the steam flow path. The second seal portion  162  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The second seal portion  162  can be divided into an upper half second seal portion  162   a  and a lower half second seal portion  162   b.    
     The bearing pedestal  3  is installed on the floor surface to support the both ends of the bundle  10 . The bearing pedestal  3  of the present embodiment includes a first bearing pedestal cover  31  and a second bearing pedestal cover  32 . 
     The first bearing pedestal cover  31  supports one end portion of the bundle  10  in the axial direction Da. The first bearing pedestal cover  31  is disposed on the floor surface on one side in the axial direction Da with respect to the casing  2 . The first bearing pedestal cover  31  is formed with only one through-hole through which the bundle casing  13  can be inserted so as to cover one end portion of the bundle  10  in the axial direction Da. The first bearing pedestal cover  31  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The first bearing pedestal cover  31  includes a first bearing pedestal  311  disposed on the lower side in the vertical direction Dv with respect to the axis Ar, and a first bearing cover portion  312  disposed on the upper side in the vertical direction Dv with respect to the axis Ar. Positioning protrusion portions  313  to be inserted into the bundle grooves  137  are formed on the first bearing pedestal  311  and the first bearing cover portion  312 . 
     The second bearing pedestal cover  32  supports the other end portion of the bundle  10  in the axial direction Da. The second bearing pedestal cover  32  is provided on the opposite side to the first bearing pedestal cover  31  across the casing  2  in the axial direction Da. The second bearing pedestal cover  32  is disposed on the floor surface on the other side in the axial direction Da with respect to the casing  2 . The second bearing pedestal cover  32  is formed with only one through-hole through which the bundle casing  13  can be inserted so as to cover the other end portion of the bundle  10  in the axial direction Da. The second bearing pedestal cover  32  can be divided up and down with the horizontal surface as the reference passing through the axis Ar. The second bearing pedestal cover  32  includes a second bearing pedestal  321  disposed on the lower side in the vertical direction Dv with respect to the axis Ar, and a second bearing crown  322  disposed on the upper side in the vertical direction Dv with respect to the axis Ar. Similarly to the first bearing pedestal  311  and the first bearing cover portion  312 , positioning protrusion portions  313  to be inserted into the bundle groove portion  137  are also formed on the second bearing pedestal  321  and the second bearing cover portion  322 . 
     Next, a method S 1  of manufacturing the steam turbine of the present embodiment will be explained. As illustrated in  FIG. 2 , the method S 1  of manufacturing the steam turbine according to the present embodiment includes an internal component preparation step S 2 , a bundle preparation step S 3 , a casing preparation step S 4 , a bundle disposition step S 5 , and an upper half casing disposition step S 6 . 
     In the internal component preparation step S 2 , the internal components of the steam turbine  1  necessary for manufacturing the bundle  10  are prepared. In the internal component preparation step S 2  of the present embodiment, the rotor  11 , the diaphragm  12 , the bundle casing  13 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  are each manufactured and prepared. 
     The bundle preparation step S 3  is performed after the internal component preparation step S 2 . In the bundle preparation step S 3 , the bundle  10  is assembled using the components prepared in the internal component preparation step S 2 . For example, the plurality of lower half diaphragms  122 , the lower half first seal portion  161   b , the lower half second seal portion  162   b , the lower half first oil-slinger portion  151   b , the lower half second oil removal portion  152   b , the lower half first bearing portion  141   b , and the lower half second bearing portion  142   b  are fixed by fastening members (not illustrated) such as bolts with respect to the lower half bundle casing  132 . Thereafter, the rotor  11  is disposed from on the upper side in the vertical direction Dv with respect to the lower half bundle casing  132  to which each component is fixed. In a state where the rotor  11  is disposed, the plurality of upper half diaphragms  121  are fixed to the lower half diaphragm  122 , and the diaphragm  12  is formed. Similarly, the first seal portion  161 , the second seal portion  162 , the first oil-slinger portion  151 , the second oil-slinger portion  152 , the first bearing portion  141 , and the second bearing portion  142  are formed. Thereafter, the upper half bundle casing  131  is disposed from on the upper side in the vertical direction Dv. The plurality of upper half diaphragms  121 , the upper half first seal portion  161   a , the upper half second seal portion  162   a , the upper half first oil-slinger portion  151   a , the upper half second oil-slinger portion  152   a , the upper half first bearing portion  141   a , and the upper half second bearing portion  142   a  are fixed by fastening members (not illustrated) such as bolts to the upper half bundle casing  131 . Therefore, the bundle  10  integrated as one component is prepared. 
     Thereafter, as illustrated in  FIG. 3 , the relative position of the rotor shaft  111  in the axial direction Da with respect to the bundle casing  13  is fixed. Specifically, in the bundle preparation step S 3 , the axial position-fixing jig  50  is attached to the end surface of the bundle casing  13  in the axial direction Da in a state where the lower half bundle casing  132  and the upper half bundle casing  131  are combined. 
     The axial position-fixing jig  50  includes a pair of casing-fixing portions  51  fixed to the bundle casing  13 , a connecting portion  52  connecting the pair of casing-fixing portions  51 , and a rotor-fixing portion  53  capable of fixing the connecting portion  52  and the rotor shaft  111 . 
     The casing-fixing portion  51  is fixed to the end surface of the bundle casing  13  in a state of straddling the upper half bundle casing  131  and the lower half bundle casing  132 . The casing-fixing portion  51  is fixed to the upper half bundle casing  131  and the lower half bundle casing  132  by fastening members such as bolts (not illustrated). The casing-fixing portion  51  is disposed apart from the bundle casing  13  in the width direction Dw (direction orthogonal to the vertical direction Dv and the axial direction Da in the radial direction Dr) so as to sandwich the rotor shaft  111 . 
     The connecting portion  52  is integrally connected to the pair of casing-fixing portions  51  so as to cover the end portion of the rotor shaft  111  protruding from the bundle casing  13  from the outside in the axial direction Da. The connecting portion  52  is a cylindrical member extending between the pair of casing-fixing portions  51  so as to form a C shape when viewed in the vertical direction Dv. That is, the casing-fixing portion  51  is fixed to both ends of the connecting portion  52 . A bolt insertion hole (not illustrated) through which a bolt member can be inserted is formed at a center portion of the connecting portion  52  in the width direction Dw. The bolt insertion hole is formed at the same position as a bolt-fixing hole (not illustrated) formed on the end surface of the rotor shaft  111  when viewed in the axial direction Da. 
     The rotor-fixing portion  53  is a long bolt member provided with an external thread on an outer peripheral surface. In the rotor-fixing portion  53 , a nut capable of relative movement is provided in the middle of the screw portion. One end of the rotor-fixing portion  53  is fixed to the bolt-fixing hole in a state of being inserted into the bolt insertion hole. The rotor-fixing portion  53  regulates the position of the rotor shaft  111  in the axial direction Da with respect to the bundle casing  13  by being moved to a position where the nut is in contact with the connecting portion  52  in a state of being fixed to the rotor shaft  111 . 
     A specific method of attaching the axial position-fixing jig  50  in the bundle preparation step S 3  will be described. In the bundle preparation step S 3 , the casing-fixing portions  51  are each fixed to the lower half bundle casing  132  and the upper half bundle casing  131 . Thereafter, the rotor-fixing portion  53  is inserted into the bolt insertion hole of the connecting portion  52 , and one end of the rotor-fixing portion  53  is fixed to the bolt-fixing hole. The position of the nut is adjusted in a state where the rotor-fixing portion  53  is fixed to the rotor shaft  111 , so that in the bundle  10 , the position of the rotor shaft  111  with respect to the bundle casing  13  in the axial direction Da is fixed. 
     As illustrated in  FIG. 2 , the casing preparation step S 4  is performed after the bundle preparation step S 3 . In the casing preparation step S 4  of the present embodiment, components other than the bundle  10  are prepared. For example, in the casing preparation step S 4 , the casing  2  and the bearing pedestal  3  are manufactured and prepared. 
     The bundle disposition process S 5  is performed after the casing preparation process S 4 . In the bundle disposition step S 5 , the lower half casing  22 , the first bearing pedestal  311 , and the second bearing pedestal  321  are disposed at setting locations. In the bundle disposition step S 5 , the bundle  10  is disposed from on the upper side in the vertical direction Dv with respect to the lower half casing  22 , the first bearing pedestal  311 , and the second bearing pedestal  321 . The bundle  10  is once lifted on the upper side in the vertical direction Dv by a crane or the like, and then adjusted in horizontal position and lowered. When the bundle  10  is disposed inside the lower half casing  22 , the bundle  10  is lowered so that the bundle groove portion  137  is fitted to the positioning protrusion portions  313  of the first bearing pedestal  311  and the second bearing pedestal  321 . As a result, the bundle  10  is disposed with respect to the lower casing  22 , the first bearing pedestal  311 , and the second bearing pedestal  321 . 
     The upper half casing disposition process S 6  is executed after the bundle disposition process S 5 . In the upper half casing disposition step S 6 , the upper half casing  21  is disposed from on the upper side in the vertical direction Dv with respect to the bundle  10  fitted into the lower half casing  22 . The upper half casing  21  is once lifted on the upper side in the vertical direction Dv using a crane or the like. Thereafter, the upper half casing  21  is lowered on the upper side of the bundle  10 . 
     When the upper half casing  21  is lowered to the vicinity of the lower half casing  22 , the horizontal position is adjusted so that the bundle  10  is accommodated on the inner peripheral side of the upper half casing  21 . Thereafter, the upper half casing  21  and the lower half casing  22  are fixed in a state where the dividing surface of the upper half casing  21  abuts against the dividing surface of the lower half casing  22 . 
     Furthermore, in the upper half casing disposition step S 6 , the first bearing cover portion  312  is attached to the end portion of the bundle  10  fitted into the first bearing pedestal  311  in the same manner as the upper half casing  21 . In this case, the first bearing cover portion  312  is attached such that the positioning protrusion portion  313  of the first bearing pedestal cover portion  312  is inserted into the bundle groove portion  137 . Further, the second bearing cover portion  322  is attached to the end portion of the bundle  10  fitted into the second bearing pedestal  321  in the same manner as the upper half case  21 . In this case, the second bearing cover portion  322  is attached such that the positioning protrusion portion  313  of the second bearing cover portion  322  is inserted into the bundle groove portion  137 . As a result, the steam turbine  1  is completed. 
     According to the steam turbine  1  and the method S 1  of manufacturing the steam turbine as described above, the rotor  11 , the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  are held by the bundle casing  13 , and are an integral component as the bundle  10 . Therefore, the rotor  11 , the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  can be moved together only by moving the bundle  10 . Therefore, when the components of the steam turbine  1  are moved, work can be significantly shortened. That is, the assembly time of the internal components in the steam turbine  1  can be greatly reduced. 
     Further, the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  are fixed to the bundle casing  13 . Therefore, even if the bundle  10  is moved, the relative positions of the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  with respect to the bundle casing  13  hardly change in any of the axial direction Da and the radial direction Dr. Further, the rotor shaft  111  is held with respect to the bundle casing  13  via the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16 . Further, the rotor shaft  111  is fixed to the bundle casing  13  by the axial position-fixing jig  50 . Therefore, the relative position of the rotor shaft  111  with respect to the bundle casing  13  hardly changes in any of the axial direction Da and the radial direction Dr. In other words, even if the bundle  10  is moved, the positions of the components in the bundle casing  13  do not deviate, so that after the bundle  10  is installed, the work for position adjustment of internal components such as the rotor  11 , the diaphragm  12 , the bearing portion  14 , the oil-slinger portion  15 , and the seal portion  16  can be shortened. 
     Further, the first bearing portion  141  and the second bearing portion  142  are fixed to the bundle casing  13  at a position deviated from the casing  2  in the axial direction Da. Therefore, the positions of the first bearing portion  141  and the second bearing portion  142 , which are in the oil atmosphere, in which the lubricating oil is used, and the region where the steam flow path through which the high-temperature steam flows is formed can be separated in the axial direction Da. Therefore, it is possible to suppress the occurrence of a defect caused by the lubricating oil due to the heat of steam in the bundle  10 . 
     Further, the bundle inlet hole  135  communicating with the casing inlet port  25  and the bundle exhaust hole  136  communicating with the casing exhaust port  26  are formed in the bundle casing  13 . Therefore, the steam flow path which is a path through which the steam which flows in from the casing inlet port  25  and is discharged from the casing exhaust port  26  can be almost formed by the components in the bundle  10 . Therefore, after the bundle  10  is attached to the lower half casing  22  and the upper half casing  21 , it is not necessary to finely adjust the positions of the internal components for efficient flow of steam. Therefore, when the components of steam turbine  1  are assembled, the work can be further shortened. 
     Other Modification Examples of Embodiment 
     As mentioned above, although an embodiment of the present disclosure is explained in detail with reference to drawings, respective configurations and a combination thereof in each embodiment are an example, and addition, omission, redisposition, and other changes of the configurations can be implemented within a range which does not deviate from the gist of the present disclosure. In addition, the present disclosure is not limited by the embodiments, and is limited only by the scope of claims. 
     For example, the configuration of the bundle  10  is not limited to the configuration of the present embodiment. The bundle  10  may include other configuration elements of the steam turbine  1  excluding the casing  2  and may not include a part of the configuration of the present embodiment. 
     In addition, for example, in each of the above-described embodiments, the method of manufacturing the steam turbine  1  is described by forming the respective components from 1 and assembling them. The method S 1  of manufacturing the steam turbine is not limited to the case of manufacturing the steam turbine  1  from 1. For example, the method S 1  of manufacturing the steam turbine may be used when disassembling and reassembling the steam turbine  1  when repair or inspection is performed. In this case, a newly prepared bundle  10  may be attached to the casing  2  in place of the used bundle  10 , or the bundle  10  formed again by servicing the used bundle  10  may be attached to the casing  2 . In addition, when repair or inspection is performed, a step of removing the upper half casing  21  or a step of removing the used bundle  10  will be further included in advance. 
     Moreover, in the method S 1  of manufacturing the steam turbine, the casing preparation step S 4  is not limited to performing after the bundle preparation process S 3 . The casing preparation step S 4  may be performed before the bundle disposition step S 5 . Therefore, the casing preparation step S 4  may be performed before the internal component preparation step S 2  or the bundle preparation step S 3 , or may be performed simultaneously with the internal component preparation step S 2  or the bundle preparation step S 3 . 
     Further, the bundle  10  is not limited to the structure in which the position of the rotor  11  in the axial direction Da with respect to the bundle casing  13  is restricted by the axial position-fixing jig  50 . The bundle  10  only needs to regulate the relative position of the rotor shaft  111  with respect to the bundle casing  13 . Therefore, for example, the rotor shaft  111  may be temporarily fixed by another member to the bundle casing  13 , and the rotor shaft  111  may be temporarily fixed to the bundle casing  13  through another component such as the diaphragm  12 . 
     While preferred embodiments of the disclosure have been described and illustrated above, it should be understood that these are exemplary of the disclosure and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit or scope of the present disclosure. Accordingly, the disclosure is not to be considered as being limited by the foregoing description, and is only limited by the scope of the appended claims. 
     EXPLANATION OF REFERENCES 
     
         
         
           
               1  steam turbine 
             Ar axis 
             Data axial direction 
             Driver radial direction 
             Dc circumferential direction 
             Dv vertical direction 
             Dh horizontal direction 
             Dw width direction 
               2  casing 
               21  upper half casing 
               22  lower half casing 
               25  casing inlet port 
               26  casing exhaust port 
               10  bundle 
               11  rotor 
               111  rotor shaft 
               112  rotor blade 
               12  diaphragm 
               121  upper half diaphragm 
               122  lower half diaphragm 
               125  nozzle 
               13  bundle casing 
               131  upper half bundle casing 
               132  lower half bundle casing 
               135  bundle inlet hole 
               136  bundle exhaust hole 
               137  bundle groove portion 
               14  bearing portion 
               141  first bearing portion 
               145  journal bearing 
               146  thrust bearing 
               141   a  upper half first bearing portion 
               141   b  lower half first bearing portion 
               142  second bearing portion 
               142   a  upper half second bearing portion 
               142   b  lower half second bearing portion 
               15  oil-slinger portion 
               151  first oil-slinger portion 
               151   a  upper half first oil-slinger portion 
               151   b  lower first oil-slinger portion 
               152  second oil-slinger portion 
               152   a  upper half second oil-slinger portion 
               152   b  lower half second oil-slinger portion 
               16  seal portion 
               161  first seal portion 
               161   a  upper half first seal portion 
               161   b  lower half first seal portion 
               162  second seal portion 
               162   a  upper half second seal portion 
               162   b  lower half second seal portion 
               3  bearing pedestal 
               31  first bearing pedestal cover 
               311  first bearing pedestal 
               312  first bearing cover portion 
               32  second bearing pedestal cover 
               321  second bearing pedestal 
               322  second bearing cover portion 
               313  positioning protrusion portion 
               50  axial position-fixing jig 
               51  casing-fixing portion 
               52  connecting portion 
               53  rotor-fixing portion 
             S 1  method of manufacturing steam turbine 
             S 2  internal component preparation step 
             S 3  bundle preparation step 
             S 4  casing preparation step 
             S 5  bundle disposition step 
             S 6  upper half casing disposition step