Position adjustment mechanism and position adjustment method

Abstract

To prevent a clearance between a casing and a rotor from becoming smaller than a planned value.SOLUTION: A position adjusting mechanism is equipped with a supporting plate that has an outer surface exposed from a foundation, a lug that projects out from a casing, an anchor block that is fixed to an outer surface of the supporting plate oppositely to the lug and receives a load from the lug, and a liner that is inserted in the lug and the anchor block. The liner has a lug side surface that contacts with the lug, and a block side surface that contacts with the anchor block. The lug has a received surface contacting with the lug side surface of the liner, and the anchor block has a block receiving surface contacting with the block side surface of the liner. The flatness of the lug side surface is higher than the flatness of the block side surface, and the flatness of the received surface is higher than the flatness of the block receiving surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a position adjustment mechanism and a position adjustment method. [Background technology]

[0002] Patent Document 1 describes an apparatus for adjusting an installation position of a steam turbine relative to a foundation frame when the casing of the steam turbine is installed on the foundation frame. The apparatus for adjusting an installation position of the steam turbine is adapted to prevent the casing of the steam turbine from being displaced in a horizontal direction perpendicular to the rotor shaft of the steam turbine. This apparatus for adjusting an installation position of the steam turbine inserts an L-shaped liner between a transverse anchor block attached to the foundation frame and a leg attached to the casing of the steam turbine. This L-shaped liner is cut and adjusted by a grinder or the like according to the size of the gap between the transverse anchor block and the leg when the casing is installed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication number 3-034554 Summary of the Invention [Problem to be solved by the invention]

[0004] In the aircraft installation adjustment device of Patent Document 1, a transverse anchor block is provided on the foundation frame and legs are provided on the casing. However, for example, legs may be provided on the anchor block of the foundation frame and an L-shaped liner may be inserted between the legs and a lug provided on the casing to position the casing. The anchor block of the foundation frame is attached by welding, so the block receiving surface of the anchor block that comes into contact with the L-shaped liner is distorted. On the other hand, the L-shaped liner is cut by a grinder or the like, so the machined surface is rough. Therefore, there is a problem that a backlash occurs between the anchor block and the L-shaped liner and between the L-shaped liner and the lug, and when a horizontal load is applied to the turbine, the casing is displaced by the amount of the backlash, and the clearance between the casing and the rotor may become smaller than the planned value.

[0005] The present disclosure has been made in consideration of the above circumstances, and provides a position adjustment mechanism and a position adjustment method that can prevent the clearance between a casing and a rotor from becoming smaller than a planned value. [Means for solving the problem]

[0006] In order to solve the above problems, the following configuration is adopted. The position adjustment mechanism of the present disclosure comprises a lug provided on an outer surface of a casing of a steam turbine and protruding from the casing, a support plate embedded in a foundation on which the steam turbine is installed and having an outer surface at least partially exposed from the foundation, an anchor block fixed to the outer surface of the support plate so as to face the lug and receive a load from the lug, and a liner inserted between the lug and the anchor block, the liner having a lug side surface in contact with the lug and a block side surface in contact with the anchor block, the lug having a received surface in contact with the lug side surface of the liner, the anchor block having a block receiving surface in contact with the block side surface of the liner, the flatness of the lug side surface is higher than the flatness of the block side surface, and the flatness of the received surface is higher than the flatness of the block receiving surface (the "flatness" conforms to the JIS standard (JIS B 0684-1)).

[0007] The position adjustment method according to the present disclosure is a position adjustment method for a steam turbine arranged relative to a foundation, and includes a preparation step of preparing an anchor block having a block receiving surface and a liner having a block side surface and a lug side surface that are back-to-back with each other, a block fixing step of fixing the anchor block to a support plate that is embedded in the foundation in advance and has an outer surface exposed from the foundation so that the block receiving surface of the anchor block faces, with a gap, a receiving surface of a lug that is previously fixed to an outer surface of a casing of the steam turbine, and a gap measurement step of measuring the gap between the receiving surface and the block receiving surface, and a width setting step of determining a width between the block side surface and the lug side surface of the liner based on a measurement result of the distance measuring step; a width adjusting step of grinding the block side surface so that the width between the block side surface and the lug side surface of the liner becomes the width determined in the width setting step; and a liner positioning step of positioning the liner after the width adjusting step between the lug side surface of the lug and the block receiving surface of the anchor block so that the lug side surface of the liner contacts the receiving surface of the lug and the block side surface of the liner after the width adjusting step contacts the block receiving surface of the anchor block.The support plate and the anchor block are formed of metal, and in the block fixing step, the anchor block is fixed to the outer surface of the support plate by welding. Effect of the Invention

[0008] According to the above aspect, it is possible to prevent the clearance between the casing and the rotor from becoming smaller than a planned value. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an exploded perspective view illustrating a schematic configuration for mounting a steam turbine on a foundation according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a plan view of a foundation on which a steam turbine is positioned in an embodiment of the present disclosure. [Diagram 3] FIG. 2 is a perspective view of an anchor block and support plate in an embodiment of the present disclosure. [Figure 4] FIG. 2 is an exploded perspective view of an enlarged position adjustment mechanism according to an embodiment of the present disclosure. [Diagram 5] FIG. 2 is a side view of a liner in an embodiment of the present disclosure. [Figure 6] 1 is a flowchart of a position adjustment method according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a position adjustment mechanism and a position adjustment method according to an embodiment of the present disclosure will be described with reference to the drawings. <Embodiment> FIG. 1 is an exploded perspective view showing a schematic configuration for installing a steam turbine on a foundation according to an embodiment of the present disclosure. As shown in FIG. 1, a position adjustment mechanism 100 in this embodiment is a mechanism that adjusts the horizontal position of a steam turbine ST when the steam turbine ST is installed on a foundation. The steam turbine ST exemplified in this embodiment is a two-flow exhaust low-pressure steam turbine.

[0011] The steam turbine ST includes a turbine rotor 11, a plurality of stator vane segments (not shown), a casing 20, and a steam inlet pipe 19. The steam inlet pipe 19 illustrated in this embodiment extends downward and is connected to the turbine rotor 11. In the steam turbine ST, which is a two-flow exhaust type low-pressure steam turbine, steam flowing from the steam inlet pipe 19 into the casing 20 is branched to one side and the other side of the rotor axial direction Da in which the axis Ar of the turbine rotor 11 extends, and is supplied to the first steam turbine section 10a and the second steam turbine section 10b, respectively. The steam inlet pipe 19 supplies, for example, steam Ws discharged from an intermediate pressure turbine (not shown) or the like provided coaxially with the turbine rotor 11 to the steam turbine ST.

[0012] In the following description, the circumferential direction centered on the axis Ar is simply referred to as the circumferential direction Dc, and the direction perpendicular to the axis Ar is referred to as the radial direction Dr. Furthermore, in this radial direction Dr, the side of the axis Ar is referred to as the radially inner side Dri, and the opposite side is referred to as the radially outer side Dro. Furthermore, in the rotor axial direction Da, the side closer to the steam inlet pipe 19 is referred to as the axial upstream side Dau, and the opposite side is referred to as the axial downstream side Dad. Further, detailed descriptions of the configurations of the first steam turbine section 10a and the second steam turbine section 10b will be omitted.

[0013] The turbine rotor 11 rotates about an axis Ar. The turbine rotor 11 has a rotor shaft 12 extending in a rotor axial direction Da about the axis Ar, and a row of multiple moving blades (not shown) attached to the rotor shaft 12. The turbine rotor 11 is supported by a bearing (not shown) so as to be rotatable about the axis Ar. The turbine rotor 11 of the first steam turbine section 10a and the turbine rotor 11 of the second steam turbine section 10b are located on the same axis Ar and are connected to each other, and rotate integrally about the axis Ar. The first steam turbine section 10a and the second steam turbine section 10b each have a stator blade row (not shown) on the axial upstream side Dau of the multiple rotor blade rows. The stator blade row has multiple stator blades (not shown) arranged side by side in the circumferential direction Dc, and is supported by the casing 20.

[0014] Casing configuration The casing 20 includes at least a casing body 22 and an exhaust casing 25 . The casing body 22 covers the first steam turbine section 10a and the second steam turbine section 10b from the radially outer side Dro. The casing body 22 in this embodiment has a funnel-shaped diffuser section 22d that curves radially outward from the axial upstream side Dau toward the axial downstream side Dad. A lug 51 that constitutes a part of the position adjustment mechanism 100 of this embodiment is provided on the outer surface of the diffuser section 22d.

[0015] The exhaust casing 25 discharges the steam Ws flowing out from the final row of moving blades of the turbine rotor 11 toward a condenser (not shown). The exhaust casing 25 of this embodiment extends from the casing body 22 to a first side Dh1 (in other words, leftward or rightward) in a horizontal direction Dh perpendicular to the axis Ar when viewed from the rotor axial direction Da, and has an opening 26 facing the first side Dh1 in the horizontal direction Dh perpendicular to the axis Ar. During operation of the steam turbine ST, a load is applied to the casing 20 having such an exhaust casing 25 from the second side Dh2 toward the first side Dh1 in the horizontal direction Dh perpendicular to the axis Ar due to the pressure difference between the pressure inside the exhaust casing 25 and atmospheric pressure. That is, a load is applied to the casing 20 toward the side where the exhaust casing 25 is located, based on the axis Ar in the horizontal direction Dh.

[0016] FIG. 2 is a plan view of a foundation on which a steam turbine is positioned in an embodiment of the present disclosure. As shown in FIG. 1 and FIG. 2, the foundation B is installed on a floor surface F around the steam turbine ST described above in a plan view. The foundation B is made of, for example, concrete blocks, and extends vertically upward from the floor surface F. The foundation B in this embodiment includes a first support portion 31 and a second support portion 32 that extend in a horizontal direction Dh perpendicular to the axis Ar and are arranged at an interval from each other in the rotor axis direction Da, and a connection support portion 33 that extends in the rotor axis direction Da to connect the ends of the first support portion 31 and the second support portion 32. The above-mentioned turbine rotor 11 is installed so as to cross the first support portion 31 and the second support portion 32. Bearings 28 (see FIG. 2) that rotatably support the turbine rotor 11 are installed on the upper surface 31a of the first support portion 31 and the upper surface 32a of the second support portion 32. The connection support portion 33 is provided on the opposite side to the exhaust casing 25 in the horizontal direction Dh perpendicular to the axis Ar. In addition, in the foundation B, another concrete block that supports the casing 20 from below may be provided between the first support portion 31 and the second support portion 32 in the rotor axial direction Da.

[0017] 《Position adjustment mechanism》 Next, the position adjustment mechanism of this embodiment will be described with reference to Fig. 1 to Fig. 5. Fig. 3 is a perspective view of an anchor block and a support plate in the embodiment of the present disclosure. Fig. 4 is an enlarged exploded perspective view of the position adjustment mechanism in the embodiment of the present disclosure. Fig. 5 is a side view of a liner in the embodiment of the present disclosure. The position adjustment mechanism 100 adjusts the position of the casing 20 with respect to the foundation B. Specifically, the position adjustment mechanism 100 of this embodiment performs positioning in a horizontal direction Dh perpendicular to the axis Ar of the casing 20 with respect to the foundation B. As shown in FIGS. 1, 3, and 4, the position adjustment mechanism 100 includes a support plate 41, a weld 42, an anchor block 43, a lug 51, and a liner 52.

[0018] The support plate 41 is embedded in the above-mentioned foundation B, and has an outer surface 41fo at least a part of which is exposed from the foundation B. The position adjustment mechanism 100 of this embodiment includes, as the support plate 41, a first support plate 41A embedded in the first support portion 31 of the foundation B, and a second support plate 41B embedded in the second support portion 32 of the foundation B. The first support plate 41A and the second support plate 41B each include a flat support plate body 41b and a plurality of stud dowels 41s extending in a vertical direction (in this embodiment, the rotor axis direction Da) from the support plate body 41b. The support plate body 41b is formed in a flat plate shape extending in the horizontal direction Dh perpendicular to the axis Ar and in the up-down direction. The outer surface 41fo of the support plate body 41b is an exposed surface exposed from the foundation B, and the inner surface 41fi of the support plate body 41b is a non-exposed surface located inside the foundation B. The stud dowels 41s are fixed to the inner surface 41fi, which is a non-exposed surface, and extend from this inner surface 41fi toward the inside of the foundation B. Since the first support plate 41A and the second support plate 41B have the same configuration, in the following description, the first support plate 41A and the second support plate 41B may be simply referred to as the support plate 41 without distinction. Furthermore, since the configurations of the position adjustment mechanisms 100 provided on the first support portion 31 side and the second support portion 32 side with respect to the casing 20 are the same, a description of the overlapping configurations will be omitted.

[0019] The welded portion 42 is provided at 41fo of the support plate body 41b. The anchor block 43 is fixed to the support plate 41 via the welded portion 42. The welded portion 42 in this embodiment can be formed by, for example, arc welding or the like.

[0020] The anchor block 43 receives a load from a lug 51 provided on the casing 20. The anchor block 43 is fixed to an outer surface 41fo of the support plate 41 via a welded portion 42 so as to face the lug 51. The anchor block 43 has a block receiving surface 43r that comes into contact with the block side surface of the liner 52. The block receiving surface 43r faces a first side Dh1 or a second side Dh2 in a horizontal direction Dh perpendicular to the axis Ar (in other words, a leftward or rightward direction as viewed from the rotor axial direction Da).

[0021] The anchor block 43 of this embodiment has a block base 44, a first leg 45A, and a second leg 45B. The block base 44 extends in a horizontal direction Dh perpendicular to the axis Ar when viewed from the rotor axial direction Da. The block base 44 has a base side surface 44fb (see FIG. 1) fixed to the outer surface 41fo of the support plate 41, and a turbine side surface 44ft in a back-to-back relationship with the base side surface 44fb. In the block base 44 of this embodiment, a groove 46 is formed on the side closer to the outer surface 41fo of the support plate 41. The welded portion 42 is formed by groove welding using this groove 46.

[0022] The first leg 45A and the second leg 45B extend from the block base 44 in the rotor axial direction Da and are formed to face each other at a distance in a horizontal direction Dh perpendicular to the axis Ar. In this embodiment, the first leg 45A and the second leg 45B extend in the vertical direction, and the vertical length of each of the first leg 45A and the second leg 45B is equal to the vertical length of the block base 44. The anchor block 43 includes the block base 44, the first leg 45A, and the second leg 45B as described above, and thus has a U-shape when viewed from the top-bottom direction perpendicular to the axis Ar.

[0023] As shown in FIG. 1, the lug 51 is provided on the outer surface 20o of the casing 20. The lug 51 of this embodiment is formed on both the first support portion 31 side and the second support portion 32 side of the casing 20 in the rotor axial direction Da. As described above, the lug 51 of this embodiment is provided on the outer surface 41fo of the diffuser portion 22d of the casing 20. The lug 51 protrudes from the outer surface 41fo of the diffuser portion 22d toward the outside in the rotor axial direction Da (in other words, toward the axial downstream side Dad). The lug 51 of this embodiment extends in the up-down direction (for example, the vertical direction) perpendicular to the axis Ar. In this embodiment, the width dimension of the lug 51 in the horizontal direction Dh perpendicular to the axis Ar is constant.

[0024] As shown in FIG. 1 and FIG. 4, the lug 51 has a receiving surface 51r that contacts the lug side surface (described later) of the liner 52. The lug 51 in this embodiment has a first receiving surface 51ra and a second receiving surface 51rb as the receiving surface 51r. The first receiving surface 51ra and the second receiving surface 51rb face each other toward the first side Dh1 and the second side Dh2 in the horizontal direction Dh perpendicular to the axis Ar. Furthermore, the first receiving surface 51ra and the second receiving surface 51rb in this embodiment are planar and parallel to each other. The lug 51 further has a lug upper surface 51u that connects the first receiving surface 51ra and the second receiving surface 51rb at the top. The height position of the lug upper surface 51u in this embodiment is the same as the height position of the upper surface 45u of the first leg portion 45A and the second leg portion 45B. A female screw 51h for fixing the liner 52 is formed on the lug upper surface 51u.

[0025] As shown in FIG. 3 and FIG. 4, the first leg 45A of the anchor block 43 has a first block receiving surface 43ra that faces the second leg 45B on the outer surface of the first leg 45A. The second leg 45B of the anchor block 43 has a second block receiving surface 43rb that faces the first leg 45A on the outer surface of the second leg 45B. The first receiving surface 51ra of the lug 51 is located between the first block receiving surface 43ra and the second block receiving surface 43rb in the horizontal direction Dh perpendicular to the axis Ar, and faces the first block receiving surface 43ra with a gap therebetween. Furthermore, the second receiving surface 51rb of the lug 51 is located between the first block receiving surface 43ra and the second block receiving surface 43rb in the horizontal direction Dh perpendicular to the axis Ar, and faces the second block receiving surface 43rb with a gap therebetween. The first block receiving surface 43ra and the second block receiving surface 43rb of the anchor block 43 are inclined so as to approach each other as they go downward.

[0026] 4 and 5, the liner 52 is inserted between the lug 51 and the anchor block 43 from above. The liner 52 of this embodiment has a liner body 53 disposed between the lug 51 and the anchor block 43 and extending in the vertical direction, and a liner flange portion 54 extending leftward or rightward (in other words, in a direction intersecting the extension direction of the liner body 53) from an upper end portion of the liner body 53. The liner flange portion 54 is detachably fixed to the lug 51 by a fastener 60 such as a bolt.

[0027] The liner body 53 of the liner 52 has a lug side surface 55 that contacts the lug 51 and a block side surface 56 that contacts the anchor block 43. In the liner 52 in this embodiment, the lower surface 54u of the liner flange portion 54 and the lug side surface 55 are formed perpendicularly. The block side surface 56 of the liner body 53 in this embodiment is inclined so as to gradually approach the lug side surface 55 downward. In other words, when viewed from the rotor axial direction Da, the liner body 53 is formed so as to taper downward.

[0028] The shape of the liner 52 is adjusted by cutting with a grinder or the like according to the shape of the gap between the lug 51 and the anchor block 43. The liner body 53 before adjustment has a cut portion 57 with a predetermined thickness of cutting allowance set on the side opposite to the extension direction of the liner flange portion 54 (in other words, the side that becomes the block side surface 56). In other words, the block side surface 56 is formed by cutting the cut portion 57. This cut portion 57 is provided over the entire area in the length direction of the liner body 53. Note that the liner 52 shown in FIG. 5 shows the liner 52 before adjustment, and the position of the limit where cutting can be performed is indicated by a two-dot chain line in FIG. 5.

[0029] 1 and 4, the position adjustment mechanism 100 of this embodiment includes a first liner 52a and a second liner 52b as the liners 52. A pair of the first liner 52a and the second liner 52b is provided on the first support portion 31 side and the second support portion 32 side of the base B. That is, in this embodiment, two pairs of the first liner 52a and the second liner 52b are provided.

[0030] The first liner 52a is inserted from above into a gap between the first leg 45A and the lug 51 with the lug 51 disposed between the first leg 45A and the second leg 45B of the anchor block 43, and fixed to the lug 51. Similarly, the second liner 52b is inserted from above into a gap between the second leg 45B and the lug 51 with the lug 51 disposed between the first leg 45A and the second leg 45B of the anchor block 43, and fixed to the lug 51. That is, the first liner 52a and the second liner 52b are disposed symmetrically as viewed from the rotor axial direction Da.

[0031] The first liner 52a has a first block side surface 56a as the block side surface 56 and a first lug side surface 55a as the lug side surface 55. The first block side surface 56a is located between the first block receiving surface 43ra and the first received surface 51ra and contacts the first block receiving surface 43ra. The first lug side surface 55a is located between the first block receiving surface 43ra and the first received surface 51ra and contacts the first received surface 51ra.

[0032] The second liner 52b has a second block side surface 56b as the block side surface 56 and a second lug side surface 55b as the lug side surface 55. The second block side surface 56b is located between the second block receiving surface 43rb and the second received surface 51rb and contacts the second block receiving surface 43rb. The second lug side surface 55b is located between the second block receiving surface 43rb and the second received surface 51rb and contacts the second received surface 51rb.

[0033] 《Flatness》 The flatness of the lug side surface 55 of the liner 52 is higher than that of the block side surface 56 of the liner 52. That is, the flatness of the first lug side surface 55a is higher than that of the first block side surface 56a, and the flatness of the second lug side surface 55b is higher than that of the second block side surface 56b. The flatness of the first lug side surface 55a and the flatness of the second lug side surface 55b are equal. The first lug side surface 55a and the second lug side surface 55b are maintained in a state in which they are precisely formed, for example, by machining in a factory. Therefore, the flatness of each of the first lug side surface 55a and the second lug side surface 55b is high. In contrast, the first block side surface 56a of the first liner 52a and the second block side surface 56b of the second liner 52b are manually cut and adjusted by an operator using a grinder or the like before being inserted between the lug 51 and the anchor block 43. The surface of the block side surface 56 is roughened by this cutting, forming irregularities. Therefore, the flatness of the first block side surface 56a and the second block side surface 56b is lower than the flatness of the first lug side surface 55a and the second lug side surface 55b.

[0034] The flatness of the receiving surface 51r of the lug 51 is higher than that of the block receiving surface 43r of the anchor block 43. That is, the flatness of the first receiving surface 51ra is higher than that of the first block receiving surface 43ra, and the flatness of the second receiving surface 51rb is higher than that of the second block receiving surface 43rb. The first receiving surface 51ra and the second receiving surface 51rb of the lug 51 maintain a precisely formed state, for example, by machining in a factory, like the above-mentioned lug side surface 55. In contrast, when the anchor block 43 is fixed to the support plate 41 via the welded portion 42, welding distortion occurs in the first block receiving surface 43ra and the second block receiving surface 43rb. Therefore, the flatness of the first block receiving surface 43ra and the flatness of the second block receiving surface 43rb are both lower than the flatness of the receiving surface 51r of the lug 51 (the first receiving surface 51ra and the second receiving surface 51rb). That is, the flatness of the first lug side surface 55a of the first liner 52a and the flatness of the first received surface 51ra of the lug 51 are higher than the flatness of the first block receiving surface 43ra of the anchor block 43. Similarly, the flatness of the second lug side surface 55b of the second liner 52b and the flatness of the second received surface 51rb of the lug 51 are higher than the flatness of the second block receiving surface 43rb of the anchor block 43.

[0035] 《Position adjustment method》 Next, a position adjustment method according to an embodiment of the present disclosure will be described with reference to the drawings. FIG. 6 is a flowchart of a position adjustment method according to an embodiment of the present disclosure. As shown in FIG. 6, the position adjustment method of this embodiment includes a preparation step S1, a block fixing step S2, a gap measurement step S3, a width setting step S4, a width adjustment step S5, and a liner arrangement step S6.

[0036] First, in a preparation step S1, an anchor block 43 having a block receiving surface 43r and a liner 52 having a block side surface 56 and a lug side surface 55 that are back-to-back are prepared. The anchor block 43 and the liner 52 (first liner 52a and second liner 52b) are both manufactured by machining in a location (e.g., a factory) different from the installation location of the steam turbine ST. Here, the above-mentioned support plate 41 is embedded in advance when the foundation B is formed, and the above-mentioned lug 51 is fixed in advance to the outer surface 20o of the casing 20 when the casing 20 is formed, etc. Furthermore, the casing 20 is placed in advance between the first support portion 31 and the second support portion 32 of the foundation B.

[0037] In the block fixing step S2, the anchor block 43 is fixed to the support plate 41. More specifically, the anchor block 43 is fixed to the outer surface 41fo of the support plate 41 so that the block receiving surface 43r of the anchor block 43 faces the receiving surface 51r of the lug 51 with a gap therebetween. In this embodiment, the anchor block 43 is arranged so that the upper surface 45u of the anchor block 43 and the lug upper surface 51u of the lug 51 are at the same position in the height direction, and the anchor block 43 is fixed to the support plate 41 by welding along the groove 46 formed in the anchor block 43.

[0038] In the gap measuring step S3, the gap between the received surface 51r and the block receiving surface 43r is measured. More specifically, the gap between the first received surface 51ra and the first block receiving surface 43ra is measured, and the gap between the second received surface 51rb and the second block receiving surface 43rb is measured. Here, the gap between the first received surface 51ra and the first block receiving surface 43ra, and the gap between the second received surface 51rb and the second block receiving surface 43rb are horizontal gaps at respective positions in the vertical direction.

[0039] In the width setting step S4, the width between the block side surface 56 and the lug side surface 55 of the liner 52 is determined based on the measurement results of the gap measurement step S3. More specifically, the width between the first block side surface 56a and the first lug side surface 55a of the first liner 52a is set based on the measurement results of the gap between the first received surface 51ra and the first block receiving surface 43ra. Furthermore, the width between the second block side surface 56b and the second lug side surface 55b of the second liner 52b is set based on the measurement results of the gap between the second received surface 51rb and the second block receiving surface 43rb.

[0040] In the width adjustment step S5, the block side surface 56 is ground so that the width between the block side surface 56 and the lug side surface 55 in the liner 52 becomes the width determined in the width setting step S4. More specifically, the first block side surface 56a is ground so that the width between the first block side surface 56a and the first lug side surface 55a in the first liner 52a becomes the width determined in the width setting step S4. Similarly, the second block side surface 56b is ground so that the width between the second block side surface 56b and the second lug side surface 55b in the second liner 52b becomes the width determined in the width setting step S4. As described above, the grinding operation in the width adjustment step S5 is performed manually by an operator using a tool such as a grinder. Note that the grinding operation in this width adjustment step S5 cannot be performed with precision, so that the flatness of the block side surface 56 after the grinding operation is equal to or lower than the flatness of the block receiving surface 43r in which welding distortion has occurred.

[0041] In the liner placement step S6, the liner 52 after the width adjustment step S5 is placed between the lug side surface 55 of the lug 51 and the block receiving surface 43r of the anchor block 43. More specifically, the first liner 52a is inserted between the first lug side surface 55a and the first block receiving surface 43ra, and the second liner 52b is inserted between the second lug side surface 55b and the second block receiving surface 43rb. This results in a state in which the first lug side surface 55a of the first liner 52a contacts the first receiving surface 51ra of the lug 51, and the first block side surface 56a of the first liner 52a contacts the first block receiving surface 43ra of the anchor block 43. Similarly, the second lug side surface 55b of the second liner 52b contacts the second receiving surface 51rb of the lug 51, and the second block side surface 56b of the second liner 52b contacts the second block receiving surface 43rb of the anchor block 43. In this embodiment, the liner flange portion 54 is further fixed to the lug 51 by a fastener 60 such as a bolt, and the liner disposing step S6 is completed.

[0042] <Action and Effect> The position adjustment mechanism 100 of the above embodiment includes a lug 51 provided on the outer surface of the casing of the steam turbine ST and protruding from the casing 20, a support plate 41 embedded in a foundation B on which the steam turbine ST is installed and having an outer surface 41fo at least a part of which is exposed from the foundation B, an anchor block 43 fixed to the outer surface 41fo of the support plate 41 so as to face the lug 51 and receive a load from the lug 51, and a liner 52 inserted between the lug 51 and the anchor block 43. The liner 52 has a lug side surface 55 that contacts the lug 51 and a block side surface 56 that contacts the anchor block 43. The lug 51 has a receiving surface 51r that contacts the lug side surface 55 of the liner 52. The anchor block 43 has a block receiving surface 43r that contacts the block side surface 56 of the liner 52. The flatness of the lug side surface 55 is higher than that of the block side surface 56, and the flatness of the receiving surface 51r is higher than that of the block receiving surface 43r. With this configuration, the liner 52 can be disposed between the lug 51 and the anchor block 43 in a state in which the block side surface 56 of the liner 52 with low flatness contacts the block receiving surface 43r of the anchor block 43, and the lug side surface 55 of the liner 52 with high flatness contacts the receiving surface 51r of the lug 51. That is, the lug side surface 55 of the liner 52 with high flatness contacts the receiving surface 51r of the lug 51 with high flatness, thereby suppressing the occurrence of a backlash between the lug side surface 55 and the receiving surface 51r. In addition, the backlash occurring at the location where the block side surface 56 of the liner 52 with low flatness contacts the block receiving surface 43r of the anchor block 43 with low flatness is smaller than the sum of the backlash between the lug 51 and the liner 52 and the backlash between the liner 52 and the anchor block 43, which occurs when the flatness of the lug side surface 55 of the liner 52 is made lower than the flatness of the block side surface 56 of the liner 52. Therefore, even if the liner 52 is adjusted by cutting with a grinder or the like, the displacement of the casing 20 can be prevented, and the clearance between the lug 51 and the anchor block 43 (casing) and the turbine rotor 11 can be prevented from becoming smaller than the planned value.

[0043] The position adjustment mechanism 100 of the above embodiment includes a welded portion 42 provided on the outer surface of a support plate, and the anchor block 43 is fixed to the outer surface 41fo of the support plate 41 via the welded portion 42. With this configuration, when the anchor block 43 is fixed to the support plate 41 via the welded portion 42, the block side surface 56 of the liner 52 with low flatness can be brought into contact with the block receiving surface 43r of the anchor block 43, the flatness of which has been reduced due to welding distortion, and the lug side surface 55 of the liner 52 with high flatness can be brought into contact with the receiving surface 51r of the lug 51. This makes it possible to prevent the casing 20 from being displaced, and to prevent the clearance between the casing 20 and the turbine rotor 11 from becoming smaller than the planned value.

[0044] The block receiving surface 43r in the position adjustment mechanism 100 of the above embodiment is a surface facing the first side Dh1 or the second side Dh2 in the horizontal direction Dh perpendicular to the axis Ar. Therefore, as in the casing 20 of the above embodiment, even if the exhaust casing 25 extends from the casing main body 22 in a horizontal direction Dh perpendicular to the axis Ar when viewed from the rotor axial direction Da, and a load toward the side on which the exhaust casing 25 is located is applied to the casing 20, it is possible to prevent the casing 20 from displacing in the horizontal direction Dh perpendicular to the axis Ar relative to the foundation B.

[0045] The anchor block 43 of the position adjustment mechanism 100 of the above embodiment has a block base 44 extending in a horizontal direction Dh perpendicular to the axis Ar when viewed from the rotor axial direction Da, and a first leg 45A and a second leg 45B extending from the block base 44 in the rotor axial direction Da and facing each other at a distance in the horizontal direction Dh perpendicular to the axis Ar. The block base 44 has a base side surface 44fb fixed to the outer surface 41fo of the support plate 41, and a turbine side surface 44ft in a back-to-back relationship with the base side surface 44fb. The first leg 45A and the second leg 45B protrude from the turbine side surface 44ft of the block base 44. The first leg 45A has a first block receiving surface 43ra, which is a block receiving surface 43r, facing the second leg 45B of the outer surface of the first leg 45A. The second leg 45B has a second block receiving surface 43rb as a block receiving surface 43r, which faces the first leg 45A on the outer surface of the second leg 45B. The lug 51 has a first receiving surface 51ra as a receiving surface 51r, which is located between the first block receiving surface 43ra and the second block receiving surface 43rb in the horizontal direction Dh perpendicular to the axis Ar and faces the first block receiving surface 43ra with a gap therebetween, and a second receiving surface 51rb as a receiving surface 51r, which is located between the first block receiving surface 43ra and the second block receiving surface 43rb in the horizontal direction Dh perpendicular to the axis Ar and faces the second block receiving surface 43rb with a gap therebetween. Furthermore, the lug 51 has a first liner 52a and a second liner 52b as a liner 52. The first liner 52a is located between the first block receiving surface 43ra and the first received surface 51ra and has a first block side surface 56a as a block side surface 56 in contact with the first block receiving surface 43ra, and a first lug side surface 55a as a lug side surface 55 in contact with the first received surface 51ra. The second liner 52b is located between the second block receiving surface 43rb and the second received surface 51rb and has a second block side surface 56b as a block side surface 56 in contact with the second block receiving surface 43rb, and a second lug side surface 55b as the lug side surface 55 in contact with the second received surface 51rb.The flatness of the first lug side surface 55a and the flatness of the first received surface 51ra are higher than the flatness of the first block receiving surface 43ra. The flatness of the second lug side surface 55b and the flatness of the second received surface 51rb are higher than the flatness of the second block receiving surface 43rb. By doing so, even when the anchor block 43 has the first leg 45A and the second leg 45B as described above, the lug 51 is disposed between the first leg 45A and the second leg 45B, the first liner 52a is inserted between the lug 51 and the first leg 45A, and the second liner 52b is inserted between the lug 51 and the second leg 45B, the rattle can be suppressed. That is, according to the above embodiment, the first liner 52a can be disposed between the lug 51 and the anchor block 43 in a state where the first block side surface 56a having a low flatness contacts the first block receiving surface 43ra having a low flatness, and the first lug side surface 55a having a high flatness contacts the first receiving surface 51ra having a high flatness. Similarly, the second liner 52b can be disposed between the lug 51 and the anchor block 43 in a state where the second block side surface 56b having a low flatness contacts the second block receiving surface 43rb having a low flatness, and the second lug side surface 55b having a high flatness contacts the second receiving surface 51rb having a high flatness. Therefore, since surfaces with high flatness can be brought into contact with each other and surfaces with low flatness can be brought into contact with each other, even when the first liner 52a and the second liner 52b are adjusted by cutting with a grinder or the like, the play that occurs between the lug 51 and the anchor block 43 as described above can be reduced.

[0046] The position adjustment mechanism 100 of the above embodiment further includes a fastener 60 that fixes the liner 52 to the lug 51. The liner 52 has a liner body 53 inserted between the lug 51 and the anchor block 43, and a liner flange portion 54 that extends from the upper end of the liner body 53 toward the lug 51 in the horizontal direction Dh perpendicular to the axis Ar. The fastener 60 fixes the liner flange portion 54 to the lug 51. With this configuration, it is possible to restrict the liner body 53 from being displaced in a direction in which it slips out from between the lug 51 and the anchor block 43. In addition, since the liner flange portion 54 can be fixed to the lug 51 via the fastener 60, the liner flange portion 54 can be easily fixed to the lug 51.

[0047] In the position adjustment mechanism 100 of the above embodiment, the distance between the lug side surface 55 and the block side surface 56 of the liner 52 gradually increases toward the upper side. With this configuration, when the liner 52 is inserted between the lug 51 and the anchor block 43, the liner 52 acts as a wedge and presses the lug 51 and the anchor block 43 in directions separating them from each other. Therefore, the lug side surface 55 can be brought into close contact with the receiving surface 51r, and the block side surface 56 can be brought into close contact with the block receiving surface 43r. This makes it possible to further reduce rattling.

[0048] The position adjustment method of the above embodiment includes a preparation step S1, a block fixing step S2, a clearance measurement step S3, a width setting step S4, a width adjustment step S5, and a liner arrangement step S6. In the preparation step S1, an anchor block 43 having a block receiving surface 43r and a liner 52 having a block side surface 56 and a lug side surface 55 in a back-to-back relationship are prepared. In the block fixing step S2, the anchor block 43 is fixed to a support plate 41 that is embedded in a foundation B in advance and has an outer surface 41fo exposed from the foundation B so that the block receiving surface 43r of the anchor block 43 faces a receiving surface 51r of a lug 51 that is previously fixed to the outer surface of the casing 20 of the steam turbine ST with a clearance therebetween. In the clearance measurement step S3, the clearance between the receiving surface 51r and the block receiving surface 43r is measured. In the width setting step S4, the width between the block side surface 56 and the lug side surface 55 of the liner 52 is determined based on the measurement result of the clearance measurement step S3. In the width adjustment step S5, the block side surface 56 is ground so that the width between the block side surface 56 and the lug side surface 55 of the liner 52 becomes the width determined in the width setting step S4. In the liner placement step S6, the liner 52 after the width adjustment step S5 is placed between the lug side surface 55 of the lug 51 and the block receiving surface 43r of the anchor block 43 so that the lug side surface 55 of the liner 52 contacts the receiving surface 51r of the lug 51 and the block side surface 56 of the liner 52 after the width adjustment step S5 contacts the block receiving surface 43r of the anchor block 43. In this way, the lug side surface 55 of the liner 52, which has a high flatness and has not been ground by a grinder or the like, can be brought into contact with the receiving surface 51r of the lug 51, which has been machined in a factory or the like and maintained in a high flatness state. Therefore, it is possible to reduce the rattle that occurs between the lug side surface 55 of the liner 52 and the receiving surface 51r of the lug 51. On the other hand, since the anchor block 43 is fixed to the support plate 41 by the block fixing step S2, the flatness of the block receiving surface 43r of the anchor block 43 decreases due to the influence of this fixing work. Then, in the above embodiment, the block side surface 56 of the liner 52, which has been roughened by grinding and has a reduced flatness, is brought into contact with the block receiving surface 43r with a low flatness, so that the surfaces with a low flatness can be brought into contact with each other. Therefore, since the surface with a high flatness does not come into contact with the surface with a low flatness, it is possible to suppress the rattle from increasing both between the liner 52 and the lug 51 and between the liner 52 and the anchor block 43.

[0049] In the position adjusting method of the above embodiment, the support plate 41 and the anchor block 43 are made of metal. Then, in the block fixing step S2, the anchor block 43 is fixed to the outer surface 41fo of the support plate 41 by welding. Therefore, even if welding distortion occurs when the anchor block 43 is welded and fixed to the outer surface 41fo of the support plate 41, resulting in low flatness of the block receiving surface 43r, the play between the lug 51 and the anchor block 43 can be prevented from becoming large.

[0050] Other Embodiments The present invention is not limited to the configurations of the above-described embodiments, and design changes are possible without departing from the spirit and scope of the present invention. For example, the position adjustment mechanism 100 in the above embodiment has been described as adjusting the position in the horizontal direction Dh perpendicular to the axis Ar between the first support portion 31 and the second support portion 32 of the foundation B and the casing 20. However, the position adjustment performed by the position adjustment mechanism 100 is not limited to the position adjustment in the horizontal direction Dh perpendicular to the axis Ar.

[0051] In addition, in the position adjustment mechanism 100 of the above embodiment, the anchor block 43 is formed in a U-shape when viewed from above, and the lug 51 is disposed between the first leg 45A and the second leg 45B of the anchor block 43. However, the present invention is not limited to this configuration, and for example, the shapes of the lug 51 and the anchor block 43 may be interchanged. Specifically, in this case, the lug 51 may be formed in a U-shape when viewed from above having the first leg 45A and the second leg 45B, and the anchor block 43 may be formed in a rectangular parallelepiped shape or the like that is disposed between the first leg 45A and the second leg 45B of the lug 51.

[0052] Furthermore, in the above embodiment, the anchor block 43 is described as having the first leg 45A and the second leg 45B integrally therewith. However, the anchor block 43 having the first leg 45A and the anchor block 43 having the second leg 45B may be provided separately. Furthermore, in the above embodiment, the first support portion 31 and the second support portion 32 are each provided with one anchor block 43. However, the first support portion 31 and the second support portion 32 may each be provided with a plurality of anchor blocks 43.

[0053] Also, in the above embodiment, a case has been described in which the liner flange portion 54 of the liner 52 extends toward the lug 51 side and is fixed to the lug upper surface 51u of the lug 51. However, the liner flange portion 54 may extend toward the anchor block 43 side and be fixed to the upper surfaces 45u of the first leg portion 45A and the second leg portion 45B.

[0054] Furthermore, in the above embodiment, the casing 20 in which the exhaust casing 25 extends from the casing main body 22 in the horizontal direction Dh perpendicular to the axis Ar has been described, but the casing 20 to which the position adjustment mechanism 100 of the present disclosure can be applied is not limited to this configuration. For example, the position adjustment mechanism 100 may be applied to a casing 20 in which the exhaust casing 25 extends downward.

[0055] In the above embodiment, the case where the position adjustment mechanism 100 adjusts the position of the low-pressure steam turbine ST has been described as an example. However, the steam turbine ST whose position is adjusted by the position adjustment mechanism 100 is not limited to the low-pressure steam turbine ST.

[0056] <Additional Notes> The position adjustment mechanism 100 described in the embodiment can be understood, for example, as follows. (1) A position adjustment mechanism 100 according to a first aspect includes a lug 51 provided on an outer surface of a casing 20 of a steam turbine ST and protruding from the casing 20, a support plate 41 embedded in a foundation B on which the steam turbine ST is installed and having an outer surface 41fo at least a portion of which is exposed from the foundation B, an anchor block 43 fixed to the outer surface 41fo of the support plate 41 so as to face the lug 51 and receive a load from the lug 51, and a liner 52 inserted between the lug 51 and the anchor block 43. , the liner 52 has a lug side 55 in contact with the lug 51 and a block side 56 in contact with the anchor block 43, the lug 51 has a receiving surface 51r in contact with the lug side 55 of the liner 52, the anchor block 43 has a block receiving surface 43r in contact with the block side 56 of the liner 52, the flatness of the lug side 55 is higher than the flatness of the block side 56, and the flatness of the receiving surface 51r is higher than the flatness of the block receiving surface 43r. With this configuration, the liner 52 can be disposed between the lug 51 and the anchor block 43 in a state in which the block side surface 56 of the liner 52 with low flatness contacts the block receiving surface 43r of the anchor block 43, and the lug side surface 55 of the liner 52 with high flatness contacts the receiving surface 51r of the lug 51. That is, the lug side surface 55 of the liner 52 with high flatness contacts the receiving surface 51r of the lug 51 with high flatness, thereby suppressing the occurrence of a backlash between the lug side surface 55 and the receiving surface 51r. In addition, the backlash occurring at the location where the block side surface 56 of the liner 52 with low flatness contacts the block receiving surface 43r of the anchor block 43 with low flatness can be made smaller than the sum of the backlash between the lug 51 and the liner 52 and the backlash between the liner 52 and the anchor block 43, which occurs when the flatness of the lug side surface 55 of the liner 52 is made lower than the flatness of the block side surface 56 of the liner 52. Therefore, even if the liner 52 is adjusted by cutting with a grinder or the like, the displacement of the casing 20 can be prevented, and the clearance between the casing 20 and the turbine rotor 11 can be prevented from becoming smaller than the planned value.

[0057] (2) The position adjustment mechanism 100 of the second aspect is the position adjustment mechanism 100 of (1), which has a welded portion 42 provided on the outer surface 41fo of the support plate 41, and the anchor block 43 is fixed to the outer surface 41fo of the support plate 41 via the welded portion 42. With this configuration, when the anchor block 43 is fixed to the support plate 41 via the welded portion 42, the block side surface 56 of the liner 52 with low flatness can be brought into contact with the block receiving surface 43r of the anchor block 43, the flatness of which has been reduced due to welding distortion, and the lug side surface 55 of the liner 52 with high flatness can be brought into contact with the receiving surface 51r of the lug 51. This makes it possible to prevent the casing 20 from being displaced, and to prevent the clearance between the casing 20 and the turbine rotor 11 from becoming smaller than the planned value. (3) A position adjustment mechanism 100 according to a third aspect is the position adjustment mechanism 100 of (1) or (2), wherein the block receiving surface 43r is a surface facing left or right when viewed from the rotor axial direction Da of the steam turbine ST. Therefore, for example, even if a load acting in the left or right direction perpendicular to the axis Ar is applied to the casing 20, such as when the exhaust casing extends to the left or right when viewed from the rotor axial direction Da, the casing 20 can be prevented from being displaced to the left or right relative to the foundation B.

[0058] (4) A position adjustment mechanism 100 according to a fourth aspect is the position adjustment mechanism 100 of (3), wherein the anchor block 43 has a block base 44 extending in the left-right direction Dh as viewed from the rotor axial direction, and a first leg 45A and a second leg 45B extending from the block base 44 in the rotor axial direction and facing each other with a gap in between in the left-right direction Dh, the block base 44 has a foundation side surface 44fb fixed to an outer surface 41fo of the support plate 41, and a turbine side surface 44ft in a back-to-back relationship with the foundation side surface 44fb, The first leg 45A and the second leg 45B protrude from the turbine side surface 44ft of the block base 44, the first leg 45A has, as the block receiving surface 43r, a first block receiving surface 43ra that faces the second leg 45B on the outer surface of the first leg 45A, the second leg 45B has, as the block receiving surface 43r, a second block receiving surface 43rb that faces the first leg 45A on the outer surface of the second leg 45B, and the lug 51 has, as the received surface 51r, a surface between the first block receiving surface 43ra and the second block receiving surface 43rb in the left-right direction Dh. a first received surface 51ra positioned between the first block receiving surface 43ra and the second block receiving surface 43rb in the left-right direction Dh and facing the first block receiving surface 43ra with a gap therebetween, and a second received surface 51rb positioned between the first block receiving surface 43ra and the second block receiving surface 43rb in the left-right direction Dh and facing the second block receiving surface 43rb with a gap therebetween; and the liner 52 includes a first liner 52a and a second liner 52b, and the first liner 52a is positioned between the first block receiving surface 43ra and the first received surface 51ra and faces the first block receiving surface 43r a, and a first lug side 55a as the lug side 55 located between the first block receiving surface 43ra and the first received surface 51ra and in contact with the first received surface 51ra; the second liner 52b has a second block side 56b as the block side 56 located between the second block receiving surface 43rb and the second received surface 51rb and in contact with the second block receiving surface 43rb, and a first lug side 55a as the lug side 55 located between the second block receiving surface 43rb and the second received surface 51rb and in contact with the second block receiving surface 43rb;and a second lug side surface 55b as the lug side surface 55 contacting the second receiving surface 51rb, the flatness of the first lug side surface 55a and the flatness of the first receiving surface 51ra are higher than the flatness of the first block receiving surface 43ra, and the flatness of the second lug side surface 55b and the flatness of the second receiving surface 51rb are higher than the flatness of the second block receiving surface 43rb. In this way, even when the anchor block 43 has the first leg 45A and the second leg 45B, the lug 51 is disposed between the first leg 45A and the second leg 45B, the first liner 52a is inserted between the lug 51 and the first leg 45A, and the second liner 52b is inserted between the lug 51 and the second leg 45B, the rattle can be suppressed. That is, according to the above configuration, the first liner 52a can be disposed between the lug 51 and the anchor block 43 in a state where the first block side surface 56a having a low flatness contacts the first block receiving surface 43ra having a low flatness, and the first lug side surface 55a having a high flatness contacts the first receiving surface 51ra having a high flatness. Similarly, the second liner 52b can be disposed between the lug 51 and the anchor block 43 in a state where the second block side surface 56b having a low flatness contacts the second block receiving surface 43rb having a low flatness, and the second lug side surface 55b having a high flatness contacts the second receiving surface 51rb having a high flatness. Therefore, since surfaces with high flatness can be brought into contact with each other and surfaces with low flatness can be brought into contact with each other, even when the first liner 52a and the second liner 52b are adjusted by cutting with a grinder or the like, the play that occurs between the lug 51 and the anchor block 43 as described above can be reduced.

[0059] (5) A position adjustment mechanism 100 according to a fifth aspect is the position adjustment mechanism 100 of (4), further comprising a fastener 60 for fixing the liner 52 to the lug 51, wherein the liner 52 has a liner body 53 inserted between the lug 51 and the anchor block 43 and a liner flange portion 54 extending from the upper end of the liner body 53 toward the lug 51 in the left-right direction Dh, and the fastener 60 fixes the liner flange portion 54 to the lug 51. With this configuration, it is possible to restrict the liner body 53 from being displaced in a direction in which it slips out from between the lug 51 and the anchor block 43. In addition, since the liner flange portion 54 can be fixed to the lug 51 via the fastener 60, the liner flange portion 54 can be easily fixed to the lug 51.

[0060] (6) A position adjustment mechanism 100 according to a sixth aspect is any one of the position adjustment mechanisms 100 of (1) to (5), in which the distance between the lug side 55 and the block side 56 gradually increases toward the upper side. With this configuration, when the liner 52 is inserted between the lug 51 and the anchor block 43, the liner 52 acts as a wedge and presses the lug 51 and the anchor block 43 in directions separating them from each other. Therefore, the lug side surface 55 can be brought into close contact with the receiving surface 51r, and the block side surface 56 can be brought into close contact with the block receiving surface 43r. This makes it possible to further reduce rattling.

[0061] (7) A position adjustment method according to a seventh aspect is a position adjustment method for a steam turbine ST arranged with respect to a foundation B, and includes a preparation step S1 of preparing an anchor block 43 having a block receiving surface 43r and a liner 52 having a block side surface 56 and a lug side surface 55 in a back-to-back relationship; a block fixing step S2 of fixing the anchor block 43 to a support plate 41 that is embedded in the foundation B in advance and has an outer surface 41fo exposed from the foundation B so that the block receiving surface 43r of the anchor block 43 faces, with a gap, a receiving surface 51r of a lug 51 that is previously fixed to an outer surface of a casing of the steam turbine ST; a gap measurement step S3 of measuring a gap between the receiving surface 51r and the block receiving surface 43r; The method includes a width setting process S4 for determining a width between the block side surface 56 and the lug side surface 55 of the liner 52 based on the measurement results of process S3; a width adjustment process S5 for grinding the block side surface 56 so that the width between the block side surface 56 and the lug side surface 55 of the liner 52 becomes the width determined in the width setting process S4; and a liner positioning process S6 for positioning the liner 52 after the width adjustment process S5 between the lug side surface 55 of the lug 51 and the block receiving surface 43r of the anchor block 43 so that the lug side surface 55 of the liner 52 contacts the receiving surface 51r of the lug 51 and the block side surface 56 of the liner 52 after the width adjustment process S5 contacts the block receiving surface 43r of the anchor block 43. In this way, the lug side surface 55 of the liner 52, which has a high flatness and has not been ground by a grinder or the like, can be brought into contact with the receiving surface 51r of the lug 51, which has been machined in a factory or the like and maintained in a high flatness state. Therefore, it is possible to reduce the rattle that occurs between the lug side surface 55 of the liner 52 and the receiving surface 51r of the lug 51. On the other hand, since the anchor block 43 is fixed to the support plate 41 by the block fixing step S2, the flatness of the block receiving surface 43r of the anchor block 43 decreases due to the influence of this fixing work. Then, in the above embodiment, the block side surface 56 of the liner 52, which has been roughened by grinding and has a reduced flatness, is brought into contact with the block receiving surface 43r with a low flatness, so that the surfaces with a low flatness can be brought into contact with each other. Therefore, since the surface with a high flatness does not come into contact with the surface with a low flatness, it is possible to suppress the rattle from increasing both between the liner 52 and the lug 51 and between the liner 52 and the anchor block 43.

[0062] (8) A position adjustment method according to an eighth aspect is the position adjustment method of (7), wherein the support plate 41 and the anchor block 43 are formed of metal, and in the block fixing step S2, the anchor block 43 is fixed to the outer surface 41fo of the support plate 41 by welding. Therefore, even if welding distortion occurs when the anchor block 43 is welded and fixed to the outer surface 41fo of the support plate 41, resulting in low flatness of the block receiving surface 43r, the play between the lug 51 and the anchor block 43 can be prevented from becoming large. [Explanation of symbols]

[0063] 10a...first steam turbine section 10b...second steam turbine section 11...turbine rotor 20...casing 22...casing body 22d...diffuser section 25...exhaust casing 26...opening 28...bearing 31...first support section 32...second support section 33...connection support section 41...support plate 41A...first support plate 41B...second support plate 41fi...inner surface 41fo...outer surface 42...welded section 43...anchor block 43r...block support surface 43ra...first block support surface 43rb...second block support surface 44...block base 45A...first leg 45B...second leg 45u...upper surface 46...groove 51...lug 51r...receiving surface 51ra...first receiving surface 51rb...second receiving surface 51h...female thread 52...liner 52a...first liner 52b...second liner 53...liner body 54...liner flange portion 55...lug side surface 55a...first lug side surface 55b...second lug side surface 56...block side surface 56a...first block side surface 56b...second block side surface 60...fixing device 100...position adjustment mechanism Ar...axis ST...steam turbine B...foundation Ws...steam

Claims

1. a lug provided on an outer surface of a casing of a steam turbine and protruding from the casing; a support plate that is embedded in a foundation on which the steam turbine is installed and has an outer surface at least a portion of which is exposed from the foundation; an anchor block fixed to an outer surface of the support plate so as to face the lug and receive a load from the lug; a liner interposed between the lug and the anchor block; Equipped with the liner has a lug side that contacts the lug and a block side that contacts the anchor block, the lug has a receiving surface that contacts the lug side surface of the liner, the anchor block has a block receiving surface that contacts the block side surface of the liner; the flatness of the lug side surface is higher than the flatness of the block side surface; The flatness of the receiving surface is higher than the flatness of the block receiving surface. Position adjustment mechanism.

2. A weld is provided on an outer surface of the support plate, The anchor block is fixed to the outer surface of the support plate via the welded portion. The position adjustment mechanism according to claim 1 .

3. The block receiving surface is a surface facing left or right as viewed from the rotor axial direction of the steam turbine. The position adjustment mechanism according to claim 1 or 2.

4. The anchor block is a block base portion extending in a left-right direction as viewed from the rotor axial direction; a first leg portion and a second leg portion extending from the block base portion in the rotor axial direction and facing each other with a gap in the left-right direction, The block base is A foundation side surface fixed to the outer surface of the support plate; a turbine side in a back-to-back relationship with the foundation side, The first leg and the second leg are protruding from the turbine side surface of the block base, The first leg portion is The block receiving surface includes a first block receiving surface that faces the second leg portion among the outer surfaces of the first leg portion, The second leg is The block receiving surface includes a second block receiving surface that faces the first leg portion and is an outer surface of the second leg portion, The lug has the following receiving surface: a first supported surface located between the first block receiving surface and the second block receiving surface in the left-right direction and facing the first block receiving surface with an interval therebetween; a second supported surface located between the first block receiving surface and the second block receiving surface in the left-right direction and facing the second block receiving surface with an interval therebetween, The liner includes a first liner and a second liner, The first liner is a first block side surface as the block side surface located between the first block receiving surface and the first received surface and in contact with the first block receiving surface, and a first lug side surface as the lug side surface located between the first block receiving surface and the first received surface and in contact with the first received surface, The second liner is a second block side surface as the block side surface located between the second block receiving surface and the second received surface and in contact with the second block receiving surface, and a second lug side surface as the lug side surface located between the second block receiving surface and the second received surface and in contact with the second received surface, the flatness of the first lug side surface and the flatness of the first receiving surface are higher than the flatness of the first block receiving surface; The flatness of the second lug side surface and the flatness of the second receiving surface are higher than the flatness of the second block receiving surface. The position adjustment mechanism according to claim 3 .

5. a fastener for fastening the liner to the lug; The liner has a liner body inserted between the lug and the anchor block, and a liner flange extending from an upper end of the liner body toward the lug side in the left-right direction, the fastener secures the liner flange to the lug; The position adjustment mechanism according to claim 4 .

6. The distance between the lug side surface and the block side surface gradually increases toward the upper side. The position adjustment mechanism according to claim 1 .

7. 1. A method for aligning a steam turbine relative to a foundation, comprising the steps of: providing an anchor block having a block receiving surface and a liner having a block side surface and a lug side surface in back-to-back relationship; a block fixing step of fixing the anchor block to a support plate that is embedded in the foundation in advance and has an outer surface exposed from the foundation so that the block receiving surface of the anchor block faces, with a gap, a receiving surface of a lug that is previously fixed to an outer surface of a casing of the steam turbine; a gap measuring step of measuring a gap between the receiving surface and the block receiving surface; a width setting step of determining a width between the block side surface and the lug side surface of the liner based on a measurement result of the interval measuring step; a width adjusting step of grinding the block side surface so that the width between the block side surface and the lug side surface of the liner becomes the width determined in the width setting step; a liner placement process for placing the liner after the width adjustment process between the lug side surface of the lug and the block receiving surface of the anchor block so that the lug side surface of the liner contacts the receiving surface of the lug and the block side surface of the liner after the width adjustment process contacts the block receiving surface of the anchor block; Including, The support plate and the anchor block are made of metal, In the block fixing step, the anchor block is fixed to the outer surface of the support plate by welding. How to adjust the position.

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