Method for disassembling and assembling vehicle exhaust chamber, and support device for lower half of bearing stand

Abstract

To reduce undesired deformation of the lower half of a vehicle exhaust chamber when the vehicle exhaust chamber is disassembled and reassembled.SOLUTION: A method for disassembling and assembling a vehicle exhaust chamber according to at least an embodiment of the present disclosure, comprises the steps of: connecting an inner support rod to a lower half of a bearing stand; connecting an outer support rod to a lower half of the vehicle exhaust chamber; installing an intermediate support member between the inner support rod and the outer support rod and causing the lower half of the vehicle exhaust chamber to support the lower half of the bearing stand; and prior to implementation of the step of causing the lower half of the vehicle exhaust chamber to support the lower half of the bearing stand, implementing at least either one of supporting the inner support rod, which is connected to the lower half of the bearing stand, from an outer circumferential side of the inner support rod by using an inner support jig and supporting the outer support rod, which is connected to the lower half of the vehicle exhaust chamber, from an outer circumferential side of the outer support rod by using an outer support jig.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a method for disassembling and assembling an exhaust casing, and a support device for a lower half of a bearing pedestal. [Background technology]

[0002] A gas turbine includes a combustor that uses compressed air and fuel to generate high-temperature, high-pressure combustion gas, a turbine that is driven to rotate by the combustion gas to generate rotational power, and an exhaust casing to which the combustion gas that has driven the turbine to rotate is sent. In the gas turbine, a bearing stand that houses a bearing part that supports the rotor on the exhaust casing side is supported on the upper and lower halves of the exhaust casing via struts (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-042721 Summary of the Invention [Problem to be solved by the invention]

[0004] If the upper half of the exhaust casing is detached from the lower half during disassembly or assembly of the exhaust casing, the exhaust casing will be split in half, reducing its rigidity, which could cause the lower half of the exhaust casing to deform undesirably due to the influence of the rotor weight. Therefore, it is desirable to prevent the lower half of the exhaust casing from deforming undesirably when the upper half of the exhaust casing is detached from the lower half during disassembly or assembly of the exhaust casing.

[0005] In view of the above circumstances, at least one embodiment of the present disclosure aims to reduce undesired deformation of the lower half of the exhaust casing when the exhaust casing is disassembled and reassembled. [Means for solving the problem]

[0006] (1) A method for disassembling and assembling an exhaust casing according to at least one embodiment of the present disclosure includes: A method for disassembling and assembling an exhaust casing of a gas turbine, comprising: connecting an inner support rod to the lower half of the bearing pedestal; connecting an outer support rod to the lower half of the exhaust casing; a step of installing an intermediate support member between the inner support rod and the outer support rod, and pressing the inner support rod radially inward via the intermediate support member and pressing the outer support rod radially outward to support the lower half of the bearing pedestal on the lower half of the exhaust casing; a step of supporting the inner support rod connected to the lower half of the bearing pedestal from an outer circumferential side by an inner support jig, or supporting the outer support rod connected to the lower half of the exhaust casing from an outer circumferential side by an outer support jig, prior to carrying out the step of supporting the lower half of the bearing pedestal on the lower half of the exhaust casing; Equipped with.

[0007] (2) A support device for a lower half of a bearing base according to at least one embodiment of the present disclosure includes: A support device for a lower half of a bearing stand used in disassembling and assembling an exhaust casing of a gas turbine, comprising: an inner support rod connectable to the lower half of the bearing base; an outer support rod connectable to the lower half of the exhaust casing; an intermediate support member that can be installed between the inner support rod and the outer support rod, and that can press the inner support rod radially inward and the outer support rod radially outward; Equipped with The support structure is provided with at least one of an inner support jig provided for the inner support rod to support the inner support rod, or an outer support jig provided for the outer support rod to support the outer support rod. [Effects of the Invention]

[0008] According to at least one embodiment of the present disclosure, undesired deformation of the lower half of the exhaust casing during disassembly and assembly of the exhaust casing can be reduced. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram of a gas turbine to which an exhaust casing disassembly and assembly method according to some embodiments can be applied. [Figure 2] FIG. 2 is a schematic view showing an exhaust casing according to some embodiments as viewed from the axial direction. [Figure 3] 10A and 10B are schematic diagrams for explaining the installation state of a support device for a lower half of a bearing stand used in a method for disassembling and assembling an exhaust casing according to some embodiments. [Figure 4] FIG. 4 is an enlarged view of a main part of FIG. 3. [Figure 5A] FIG. 10 is a perspective view showing an installation state of an inner support jig. [Figure 5B] FIG. 10 is a perspective view showing the installation status of the outer support jig. [Figure 6A] 10 is a schematic diagram for explaining the installation of a support device when performing disassembly and assembly work of the exhaust casing. FIG. [Figure 6B] 10 is a schematic diagram for explaining the installation of a support device when performing disassembly and assembly work of the exhaust casing. FIG. [Figure 6C] 10 is a schematic diagram for explaining the installation of a support device when performing disassembly and assembly work of the exhaust casing. FIG. [Figure 7] 10 is a flowchart showing a procedure for disassembling and assembling the exhaust casing. [Figure 8] 10A and 10B are schematic diagrams for explaining another embodiment of the intermediate support member. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement exactly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions representing shapes such as a square shape or a cylindrical shape not only represent shapes such as a square shape or a cylindrical shape in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions that exclude the presence of other elements.

[0011] (Gas Turbine) FIG. 1 is a schematic configuration diagram of a gas turbine to which methods for disassembling and assembling an exhaust casing according to some embodiments can be applied. 1, a gas turbine 1 according to some embodiments includes a compressor 11 for generating compressed air, a combustor 12 for generating combustion gas using the compressed air and fuel, a turbine 13 configured to be rotationally driven by the combustion gas, and an exhaust casing 3 to which the combustion gas that has rotationally driven the turbine 13 is sent. In the case of a gas turbine 1 for power generation, a generator (not shown) is connected to the turbine 13.

[0012] The compressor 11 includes a plurality of stator vanes 15 fixed to the compressor casing 14 side, and a plurality of rotor blades 17 implanted in a rotor 16 so as to be arranged alternately with respect to the stator vanes 15 . Air taken in through an air intake 18 is sent to the compressor 11, and the air sent to the compressor 11 is compressed as it passes through a plurality of stator vanes 15 and a plurality of rotor blades 17, becoming high-temperature, high-pressure compressed air.

[0013] The combustor 12 is supplied with fuel and compressed air generated by the compressor 11, and the fuel is combusted in the combustor 12 to generate combustion gas, which is the working fluid of the turbine 13. In the embodiment shown in Fig. 1, the gas turbine 1 has a plurality of combustors 12 arranged in a casing 20 along the circumferential direction around the rotor 16.

[0014] The turbine 13 has a combustion gas passage 22 formed by a turbine casing 21, and includes a plurality of stator vanes 23 and rotor blades 24 provided in the combustion gas passage 22. The stator vanes 23 and rotor blades 24 of the turbine 13 are provided downstream of the combustor 12 in the flow direction of the combustion gas. The stator vanes 23 are fixed to the turbine casing 21 side, and a plurality of the stator vanes 23 arranged along the circumferential direction of the rotor 16 constitute a stator vane row. The moving blades 24 are implanted in the rotor 16, and a plurality of the moving blades 24 arranged along the circumferential direction of the rotor 16 constitute a moving blade row. The stator vane rows and moving blade rows are arranged alternately in the axial direction of the rotor 16. In the turbine 13, the combustion gas from the combustor 12 flows into the combustion gas passage 22 and passes through a plurality of stator vanes 23 and a plurality of rotor blades 24, thereby driving the rotor 16 to rotate, which in turn drives a generator connected to the rotor 16 to generate electricity. After driving the turbine 13, the combustion gas is discharged to the outside through the exhaust casing 3.

[0015] (exhaust compartment) FIG. 2 is a schematic view showing an exhaust casing according to some embodiments as viewed from the axial direction. 1, the exhaust casing 3 according to some embodiments is provided downstream of the stator blades 23 and rotor blades 24 of the turbine 13 in the flow direction of the combustion gas. Hereinafter, the upstream side in the flow direction of the combustion gas (direction from the turbine 13 toward the compressor 11) may be simply referred to as the upstream side, and the downstream side in the flow direction of the combustion gas may be simply referred to as the downstream side.

[0016] The exhaust casing 3 includes a cylindrical casing wall 31 extending along the axial direction of the rotor 16 (the direction in which the central axis CA of the rotor 16 extends), a bearing case (bearing stand) 32 arranged radially inside the casing wall 31, a plurality of struts 4 connecting the casing wall 31 and the bearing case 32, and strut covers 5 covering the outer surfaces 41 of each of the struts 4. The exhaust casing 3 further includes a cylindrical outer diffuser 33 arranged radially inward of the casing wall 31, a cylindrical inner diffuser 35 arranged radially inward of the outer diffuser 33 to form a diffuser flow path 34 between the outer diffuser 33 and the inner diffuser 35, and a partition wall 36 provided between the inner diffuser 35 and the bearing case 32. The outer diffuser 33, the inner diffuser 35, and the partition wall 36 each extend along the axial direction of the rotor 16. The strut cover 5 connects the outer diffuser 33 and the inner diffuser 35.

[0017] In the illustrated embodiment, each of the casing wall 31 and the bearing case 32 is formed in a cylindrical shape centered on the central axis CA. The casing wall 31 includes an upper casing wall half (exhaust casing upper half) 31U and a lower casing wall half (exhaust casing lower half) 31D, which are divided by a horizontal plane. The bearing case 32 houses the bearing portion 37 and supports the bearing portion 37 so that it cannot rotate, and includes an upper half (bearing pedestal upper half) 32U and a lower half (bearing pedestal lower half) 32D, which are divided by a horizontal plane. The bearing portion 37 rotatably supports the rotor 16.

[0018] The diffuser passage 34 is formed in an annular shape with a cross-sectional area that gradually increases downstream, and is adapted to receive the combustion gas that has passed through the final stage rotor blades 24A of the turbine 13. The flow of the combustion gas sent to the diffuser passage 34 is decelerated, and the kinetic energy of the combustion gas is converted into pressure (static pressure recovery).

[0019] 2, each strut 4 has one longitudinal end 42 fixed to the cabin wall 31 and the other longitudinal end 43 fixed to the bearing case 32. The bearing case 32 is supported by the cabin wall 31 via the strut 4. In the illustrated embodiment, as shown in Fig. 2, the strut 4 extends in a tangential direction of the bearing case 32. In other words, the strut 4 extends radially outward from the other end 43 toward one side in the circumferential direction. The strut cover 5 extends in the extension direction of the strut 4 (the tangential direction of the bearing case 32). Note that in some other embodiments, the strut 4 and the strut cover 5 may each extend in a radial direction. In the illustrated embodiment, six struts 4 are arranged spaced apart from one another along the circumferential direction, and six strut covers 5 are arranged spaced apart from one another along the circumferential direction.

[0020] (Disassembly and assembly of exhaust casing 3) If exhaust casing upper half 31U is detached from exhaust casing lower half 31D during disassembly or assembly of exhaust casing 3, exhaust casing 3 will be split in half, reducing rigidity, which may result in undesired deformation of exhaust casing lower half 31D due to the influence of the weight of rotor 16. Therefore, it is desirable to prevent undesired deformation of exhaust casing lower half 31D when exhaust casing upper half 31U is detached from exhaust casing lower half 31D during disassembly or assembly of exhaust casing 3.

[0021] Therefore, in some embodiments of the method for disassembling and assembling an exhaust casing, undesirable deformation of the lower half of the exhaust casing 31D is reduced by supporting the lower half of the bearing base 32D with a support device 100 when disassembling or assembling the exhaust casing 3. FIG. 3 is a schematic diagram for explaining an installation state of a support device (described later) for the lower half of the bearing pedestal used in the method for disassembling and assembling an exhaust casing according to some embodiments. FIG. 4 is an enlarged view of the main part of FIG. FIG. 5A is a perspective view showing an installation state of an inner support jig, which will be described later. FIG. 5B is a perspective view showing an installation state of an outer support jig, which will be described later. 3 and 4, the strut 4, the strut cover 5, and the partition wall 36 are omitted.

[0022] (Support device 100) In the exhaust casing disassembly and assembly method according to some embodiments, the bearing pedestal lower half 32D is supported on the exhaust casing lower half 31D by a support device 100. To this end, the support device 100 according to some embodiments includes an inner support rod 101, an outer support rod 103, and an intermediate support member 105, which are provided between the bearing pedestal lower half 32D and the exhaust casing lower half 31D. Furthermore, the support device 100 according to some embodiments includes an inner support jig 107 for supporting the inner support rod 101 and an outer support jig 109 for supporting the outer support rod 103.

[0023] In some embodiments of the disassembly and assembly method for an exhaust casing, as shown in FIG. 3, when viewed from the extension direction of the central axis CA of the rotor 16, two support devices 100 are arranged symmetrically on either side of a virtual line VL that passes through the central axis CA and extends vertically. Since the two inner support rods 101 and the two outer support rods 103 are arranged symmetrically across the imaginary line VL, the bearing pedestal lower half 32D can be stably supported.

[0024] In addition, in the disassembly and assembly method for an exhaust casing according to some embodiments, as shown in FIG. 2, the support device 100 is positioned to avoid the strut 4 and strut cover 5 when viewed from the extension direction of the central axis CA of the rotor 16. In FIG. 2, the position of the support device 100 when the support device 100 is arranged as described below is indicated by a two-dot chain line. In this way, in the exhaust casing disassembly and assembly methods according to some embodiments, the support device 100 is arranged in a position inclined with respect to the vertical direction.

[0025] (Inner support rod 101) In the support device 100 according to some embodiments, the inner support rod 101 is a shaft-like member connectable to the bearing base lower half 32D. One end 101a of the inner support rod 101, which is configured to face the bearing base lower half 32D, is provided with a protrusion 102 that protrudes in the extension direction of the inner support rod 101. The lower half 32D of the bearing base is provided with a receiving portion 321 that is connected to and supported by the support device 100. The receiving portion 321 is provided with a recess 323 that is formed so that the protrusion 102 of the inner support rod 101 can be loosely inserted therein. The protrusion 102 is formed so as to be loosely inserted into the recess 323 of the bearing base lower half 32D.

[0026] (Outer support rod 103) In the support device 100 according to some embodiments, the outer support rod 103 is a shaft-shaped member that can be connected to the lower half of the exhaust casing 31D. One end 103a of the outer support rod 103 is configured to face the lower half of the exhaust casing 31D and is provided with a protrusion 104 that protrudes in the extending direction of the outer support rod 103. The lower half 31D of the exhaust casing is provided with a receiving portion 311 that is connected to the support device 100 and supports the support device 100. The receiving portion 311 is provided with a recess 313 that is formed so that the protrusion 104 of the outer support rod 103 can be loosely inserted therein. The protrusion 104 is formed so as to be loosely inserted into the recess 313 of the exhaust casing lower half 31D.

[0027] (Intermediate support member 105) In the support device 100 according to some embodiments, the intermediate support member 105 can be installed between the inner support rod 101 and the outer support rod 103, i.e., between the other end 101b of the inner support rod 101 and the other end 103b of the outer support rod 103, and is configured to be able to press the inner support rod 101 radially inward and to press the outer support rod 103 radially outward. In the support device 100 according to some embodiments, the intermediate support member 105 is, for example, a jack. For example, the intermediate support member 105 includes a jack body 106a and a ram 106b configured to move forward and backward relative to the jack body 106a.

[0028] (Inner support jig 107) In the support device 100 according to some embodiments, the inner support jig 107 is a jig for supporting the inner support rod 101 connected to the bearing pedestal lower half 32D. In the support device 100 according to some embodiments, the inner support jig 107 has an attachment portion 71 that can be attached to the inner diffuser 35, a support portion 72 that can support the inner support rod 101 by abutting against the outer periphery of the inner support rod 101, and a U-bolt attachment portion 75 to which a U-bolt 73 and a wing nut 74 that abut against the outer periphery of the inner support rod 101 and fix the inner support rod 101 to the inner support jig 107 are attached.

[0029] (Outer support jig 109) In the support device 100 according to some embodiments, the outer support jig 109 is a jig for supporting the outer support rod connected to the exhaust casing lower half 31D. In the support device 100 according to some embodiments, the outer support jig 109 has an attachment portion 91 that can be attached to the outer diffuser 33, a support portion 92 that can support the outer support rod 103 by abutting against the outer periphery of the outer support rod 103 and is provided at a distance from the attachment portion 91 along the extension direction of the outer support rod 103 when the outer support rod 103 is supported, and a connection portion 93 that connects the attachment portion 91 and the support portion 92.

[0030] (Method of disassembling and assembling exhaust casing according to some embodiments) In the method of disassembling and assembling an exhaust casing according to some embodiments, the support device 100 according to some embodiments described above is used to disassemble and assemble the exhaust casing 3 as follows. 6A to 6C are schematic diagrams for explaining the installation of a support device when performing disassembly and assembly work of the exhaust casing. FIG. 7 is a flowchart showing the procedure for disassembling and assembling the exhaust casing. In the disassembly and assembly work of the exhaust casing 3, the worker installs the support device 100 in accordance with the procedure shown in FIG. 7, and supports the bearing pedestal lower half 32D on the exhaust casing lower half 31D.

[0031] A method for disassembling and assembling an exhaust casing according to some embodiments includes step S1 of providing an opening, step S3 of attaching a support jig, step S5 of attaching a support rod, and step S7 of attaching an intermediate support member.

[0032] (Step S1 of providing an opening) In order to support the bearing pedestal lower half 32D on the exhaust casing lower half 31D by the support device 100, it is necessary to provide openings in the inner diffuser 35 and the outer diffuser 33 for inserting the inner support rods 101 and the outer support rods 103 therethrough. Step S1 of providing openings is a step of providing openings for inserting the inner support rod 101 and the outer support rod 103 in the inner diffuser 35 and the outer diffuser 33. In step S1 of providing openings, an operator removes a cover member (not shown) that closes an opening 35a that is provided in advance in the inner diffuser 35 from the inner diffuser 35 to expose the opening 35a as shown in Fig. 6A. In step S1 of providing openings, an operator also removes a cover member (not shown) that closes an opening 33a that is provided in advance in the outer diffuser 33 from the outer diffuser 33 to expose the opening 33a as shown in Fig. 6A. The cover member (not shown) that closes opening 35a is fixed to flange plate portion 35b provided around opening 35a by bolts or the like, and the cover member (not shown) that closes opening 33a is fixed to flange plate portion 33b provided around opening 33a by bolts or the like.

[0033] (Step S3: Attaching the support jig) Step S3 of attaching the support jigs is a step for attaching the inner support jig 107 to the inner diffuser 35 and attaching the outer support jig 109 to the outer diffuser 33. In step S3 of attaching the support jigs, the worker fixes the attachment portion 71 of the inner support jig 107 to, for example, the flange plate portion 35b of the inner diffuser 35 with bolts or the like (for example, wing bolts 79). The worker also fixes the attachment portion 91 of the outer support jig 109 to, for example, the flange plate portion 33b of the outer diffuser 33 with bolts or the like (for example, wing bolts 99).

[0034] (Step S5: Attaching the support rod) Step S5 of attaching the support rods is a step of connecting the inner support rod 101 to the bearing pedestal lower half 32D and supporting the inner support rod 101 connected to the bearing pedestal lower half 32D from the outer periphery of the inner support rod 101 by an inner support jig 107. Step S5 of attaching the support rods is also a step of connecting the outer support rod 103 to the exhaust casing lower half 31D and supporting the outer support rod 103 connected to the exhaust casing lower half 31D from the outer periphery of the outer support rod 103 by an outer support jig 109.

[0035] In step S5 of attaching the support rods, the worker connects the inner support rod 101 to the bearing pedestal lower half 32D by loosely inserting the protrusion 102 of the inner support rod 101 into the recess 323 of the bearing pedestal lower half 32D. This allows the inner support rod 101 to be easily connected to the bearing base lower half 32D.

[0036] Then, while supporting the inner support rod 101 to prevent it from falling, the worker supports the outer periphery of the inner support rod 101 on the support part 72 of the inner support jig 107, and while abutting the U-bolt 73 on the outer periphery of the inner support rod 101, fixes it to the U-bolt mounting part 75 with the wing nut 74. 4 and 6C tends to rotate clockwise in Figures 4 and 6C with the support portion 72 as a fulcrum by the U-bolt 73 when the wing nut 74 is tightened. However, because the protrusion 102 of the inner support rod 101 is loosely inserted into the recess 323 of the bearing base lower half 32D, the clockwise rotation of the inner support rod 101 is restricted. That is, by tightening the wing nut 74, the inner support rod 101 is fixed by the U-bolt 73, the support portion 72, and the recess 323 of the bearing base lower half 32D. Therefore, the inner support rod 101 will not fall. The same applies to the inner support rod 101 arranged on the opposite side of the virtual line VL from the inner support rod 101 shown in Figures 4 and 6C, as described above.

[0037] In this way, in step S5 of attaching the support rod, prior to performing step S7 of attaching the intermediate support member, the inner support rod 101 connected to the lower half of the bearing base 32D is preferably supported from the outer periphery of the inner support rod 101 by the inner support jig 107. This prevents the inner support rod 101 from falling, eliminating the need for a worker to support the inner support rod 101.

[0038] In step S5 of attaching the support rods, the worker loosely inserts the protrusions 104 of the outer support rods 103 into the recesses 313 of the exhaust casing lower half 31D, thereby connecting the outer support rods 103 to the exhaust casing lower half 31D. This allows the outer support rod 103 to be easily connected to the exhaust casing lower half 31D.

[0039] In the exhaust casing disassembly and assembly methods according to some embodiments, the support device 100 is arranged in a position inclined relative to the vertical direction. Therefore, an operator supports the outer periphery of the outer support rod 103 from below by the support portion 92 of the outer support jig 109. Note that the outer support jig 109 is attached in a position such that the support portion 92 can support the outer periphery of the outer support rod 103 from below in step S3 of attaching the support jig. 4 and 6C tends to rotate counterclockwise in Figures 4 and 6C around the support portion 92 as a fulcrum due to the weight of the outer support rod 103. However, because the protrusion 104 of the outer support rod 103 is loosely inserted into the recess 313 of the exhaust casing lower half 31D, the counterclockwise rotation of the outer support rod 103 is restricted. That is, due to the weight of the outer support rod 103, the outer support rod 103 is fixed by the support portion 92, the recessed portion 313 in the exhaust casing lower half 31D, and the receiving portion 311 in the exhaust casing lower half 31D that supports the weight of the outer support rod 103 from below. Therefore, the outer support rod 103 will not tip over or fall. The same applies to the outer support rod 103 arranged on the opposite side of the virtual line VL from the outer support rod 103 shown in Figures 4 and 6C, as described above.

[0040] In this way, in step S5 of attaching the support rod, prior to performing step S7 of attaching the intermediate support member, the outer support rod 103 connected to the lower half of the exhaust casing 31D may be supported from the outer periphery of the outer support rod 103 by the outer support jig 109. This prevents the outer support rod 103 from tipping over or falling, and eliminates the need for workers to support the outer support rod 103.

[0041] (Step S7 of attaching the intermediate support member) Step S7 of attaching the intermediate support member is a step of installing the intermediate support member 105 between the inner support rod 101 and the outer support rod 103, and pressing the inner support rod 101 radially inward and the outer support rod 103 radially outward via the intermediate support member 105 to support the bearing pedestal lower half 32D on the exhaust casing lower half 31D. In step S7 of attaching the intermediate support member, the worker installs the intermediate support member 105 between the other end 101b of the inner support rod 101 and the other end 103b of the outer support rod 103, which are fixed as shown in FIG. 6C by performing step S5 of attaching the support rods. Then, the worker extends the ram 106b relative to the jack body 106a of the intermediate support member 105 to press the inner support rod 101 radially inward and the outer support rod 103 radially outward. As a result, the bearing pedestal lower half 32D is supported by the exhaust casing lower half 31D via the support device 100 as shown in FIG.

[0042] If neither the inner support jig 107 nor the outer support jig 109 were used, from the start of step S5 of attaching the support rods to the completion of step S7 of attaching the intermediate support member, a second worker other than the first worker performing step S7 of attaching the intermediate support member would need to support the outer support rod 103 to prevent it from tipping over, and a third worker other than the first and second workers would need to support the inner support rod 101 to prevent it from falling. Therefore, according to the disassembly and assembly method for an exhaust casing in some embodiments, the support device 100 can be installed by the first worker without the presence of the second and third workers, thereby reducing the labor (man-days) required to disassemble and assemble the exhaust casing 3.

[0043] In the disassembly work of the exhaust casing 3, step S7 of attaching the intermediate support member may be performed before removing the exhaust casing upper half 31U from the exhaust casing lower half 31D. This allows the bearing pedestal lower half 32D to be supported by the exhaust casing lower half 31D before the exhaust casing upper half 31U is detached from the exhaust casing lower half 31D, causing the exhaust casing 3 to split in half and reduce rigidity, i.e., before undesired deformation of the exhaust casing lower half 31D occurs. Therefore, even when the exhaust casing upper half 31U is detached from the exhaust casing lower half 31D, undesired deformation of the exhaust casing lower half 31D can be reduced.

[0044] In addition, in the assembly work of the exhaust casing 3, step S7 of attaching the intermediate support member may be preferably performed before placing the rotor 16 on the bearing pedestal lower half 32D. As a result, by disposing the rotor 16 in the bearing pedestal lower half 32D in a state in which the exhaust casing upper half 31U has been removed from the exhaust casing lower half 31D, causing the exhaust casing 3 to be split in half and reducing its rigidity, the bearing pedestal lower half 32D can be supported by the exhaust casing lower half 31D before undesired deformation of the exhaust casing lower half 31D occurs. Therefore, even when the rotor 16 is disposed in the bearing pedestal lower half 32D, undesired deformation of the exhaust casing lower half 31D can be reduced.

[0045] As described above, the disassembling and assembling method for an exhaust casing according to some embodiments includes step S5 of attaching the support rods and step S7 of attaching the intermediate support member. Also, the support device 100 according to some embodiments includes the inner support rod 101, the outer support rod 103, the intermediate support member 105, the inner support jig 107, and the outer support jig 109. As a result, during disassembly and assembly of the exhaust casing 3, the bearing pedestal lower half 32D can be supported by the exhaust casing lower half 31D via the inner support rods 101, the outer support rods 103, and the intermediate support member 105, thereby reducing undesired deformation of the exhaust casing lower half 31D during disassembly and assembly of the exhaust casing 3. Furthermore, according to the exhaust casing disassembly and assembly method according to some embodiments and the support device 100 according to some embodiments, the inner support rods 101 connected to the bearing pedestal lower half 32D can be supported from the outer periphery of the inner support rods 101 by the inner support jig 107, and the outer support rods 103 connected to the exhaust casing lower half 31D can be supported from the outer periphery of the outer support rods 103 by the outer support jig 109. This prevents the inner support rods 101 and the outer support rods 103 from tipping over or falling, eliminating the need for workers to support the inner support rods 101 and the outer support rods 103. This reduces the labor (man-days) required during disassembly and assembly of the exhaust casing 3.

[0046] (Regarding other embodiments of the intermediate support member 105) 8 is a schematic diagram for explaining another embodiment of the intermediate support member. The intermediate support member 105 described above is a jack. However, the intermediate support member 105 may be something other than a jack as long as it can be installed between the other end 101b of the inner support rod 101 and the other end 103b of the outer support rod 103 and is configured to be able to press the inner support rod 101 radially inward and to press the outer support rod 103 radially outward.

[0047] In the example shown in Fig. 8, the intermediate support member 105 is a turnbuckle. That is, the intermediate support member 105 shown in Fig. 8 has a turnbuckle main body 108a and a pair of rods 108b protruding from both ends of the turnbuckle main body 108a. The intermediate support member 105 shown in Fig. 8 is configured so that the pair of rods 108b can expand and contract with respect to the turnbuckle main body 108a by rotating the turnbuckle main body 108a and the pair of rods 108b relative to each other.

[0048] When the intermediate support member 105 shown in Fig. 8 is used, in step S7 of installing the intermediate support member, the worker installs the intermediate support member 105 shown in Fig. 8 between the other end 101b of the inner support rod 101 and the other end 103b of the outer support rod 103, which are fixed as shown in Fig. 6C by performing step S5 of installing the support rods. Then, by relatively rotating the turnbuckle body 108a and the pair of rods 108b, the inner support rod 101 is pressed radially inward and the outer support rod 103 is pressed radially outward. As a result, the bearing base lower half 32D is supported by the exhaust casing lower half 31D via the support device 100 as shown in Fig. 8.

[0049] The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications. For example, in the outer support jig 109 described above, the outer support rod 103 may be fixed to the outer support jig 109 by a U-bolt 73 and a wing nut 74, similar to the inner support jig 107. In this case, it is not necessary to support the outer periphery of the outer support rod 103 from below by the support portion 92 of the outer support jig 109, and the outer support jig 109 may be attached to the flange plate portion 33b of the outer diffuser 33 so that the outer support jig 109 is positioned above the outer periphery of the outer support rod 103, for example.

[0050] In the above-described methods for disassembling and assembling an exhaust casing according to some embodiments, both the inner support jig 107 and the outer support jig 109 are used, but it is also possible to use only one of the inner support jig 107 or the outer support jig 109. That is, the support device 100 according to some embodiments may include only one of the inner support jig 107 or the outer support jig 109.

[0051] When only the inner support jig 107 is used, from the start of step S5 of attaching the support rod to the completion of step S7 of attaching the intermediate support member, a worker other than the worker performing step S7 of attaching the intermediate support member must support the outer support rod 103 to prevent it from falling over. However, even in this case, since there is no need for a worker to support the inner support rod 101, the number of workers required to install the support device 100 can be reduced.

[0052] Furthermore, when only the outer support jig 109 is used, from the start of step S5 of attaching the support rod to the completion of step S7 of attaching the intermediate support member, a worker other than the worker performing step S7 of attaching the intermediate support member must support the inner support rod 101 to prevent it from falling. However, even in this case, since there is no need for a worker to support the outer support rod 103, the number of workers required to install the support device 100 can be reduced.

[0053] In other words, step S5 of attaching the support rods described above may be any step that, prior to step S7 of attaching the intermediate support member, carries out at least one of supporting the inner support rod 101 connected to the lower half of the bearing base 32D from the outer periphery of the inner support rod 101 using an inner support jig 107, or supporting the outer support rod 103 connected to the lower half of the exhaust casing 31D from the outer periphery of the outer support rod 103 using an outer support jig 109.

[0054] In some embodiments, the support device 100 may include at least one of an inner support jig 107 provided for the inner support rod 101 and for supporting the inner support rod 101, or an outer support jig 109 provided for the outer support rod 103 and for supporting the outer support rod 103.

[0055] The contents described in each of the above embodiments can be understood, for example, as follows. (1) A method for disassembling and assembling an exhaust casing according to at least one embodiment of the present disclosure is a method for disassembling and assembling an exhaust casing 3 of a gas turbine 1. The method for disassembling and assembling an exhaust casing according to at least one embodiment of the present disclosure includes a step of connecting an inner support rod 101 to a bearing pedestal lower half 32D (step S5), a step of connecting an outer support rod 103 to an exhaust casing lower half 31D (step S5), and a step of installing an intermediate support member 105 between the inner support rod 101 and the outer support rod 103, pressing the inner support rod 101 radially inward via the intermediate support member 105 and pressing the outer support rod 103 radially outward to support the bearing pedestal lower half 32D on the exhaust casing lower half 31D. and, prior to carrying out the step (step S7) of supporting the bearing base lower half 32D on the exhaust casing lower half 31D, a step (step S5) of carrying out at least one of supporting the inner support rod 101 connected to the bearing base lower half 32D from the outer periphery of the inner support rod 101 by an inner support jig 107, or supporting the outer support rod 103 connected to the exhaust casing lower half 31D from the outer periphery of the outer support rod 103 by an outer support jig 109.

[0056] According to the method (1) above, the bearing pedestal lower half 32D can be supported by the exhaust casing lower half 31D via the inner support rods 101, the outer support rods 103, and the intermediate support member 105 during disassembly and assembly of the exhaust casing 3, thereby reducing undesired deformation of the exhaust casing lower half 31D during disassembly and assembly of the exhaust casing 3. Furthermore, according to the method (1) above, the inner support rods 101 connected to the bearing pedestal lower half 32D can be supported from the outer periphery of the inner support rods 101 by the inner support jig 107, or the outer support rods 103 connected to the exhaust casing lower half 31D can be supported from the outer periphery of the outer support rods 103 by the outer support jig 109. This prevents the inner support rods 101 or the outer support rods 103 from tipping over or falling, eliminating the need for workers to support the inner support rods 101 or the outer support rods 103. This reduces the man-days required for disassembly and assembly of the exhaust casing 3.

[0057] (2) In some embodiments, in the method of (1) above, in the step of connecting the inner support rods 101 to the bearing pedestal lower half 32D (step S5), the two inner support rods 101 may be arranged symmetrically across an imaginary line VL that passes through the central axis CA and extends vertically when viewed from the extension direction of the central axis CA of the rotor 16 of the gas turbine 1. In the step of connecting the outer support rods 103 to the exhaust casing lower half 31D (step S5), the two outer support rods 103 may be arranged symmetrically across the imaginary line VL when viewed from the extension direction of the central axis CA.

[0058] According to the method (2) above, the two inner support rods 101 and the two outer support rods 103 are arranged symmetrically across the imaginary line VL, so that the bearing pedestal lower half 32D can be stably supported.

[0059] (3) In some embodiments, in the step (step S5) of carrying out at least one of the methods (1) or (2) above, prior to carrying out the step (step S7) of supporting the bearing base lower half 32D on the exhaust casing lower half 31D, it is preferable to support the inner support rod 101 connected to the bearing base lower half 32D from the outer periphery of the inner support rod 101 by an inner support jig 107.

[0060] According to the method (3) above, the inner support rod 101 connected to the lower half of the bearing base 32D can be supported from the outer periphery of the inner support rod 101 by the inner support jig 107, so that the inner support rod 101 can be prevented from falling, and it is no longer necessary for an operator to support the inner support rod 101.

[0061] (4) In some embodiments, in the step (step S5) of performing at least one of the methods (1) to (3) above, prior to performing the step (step S7) of supporting the bearing base lower half 32D on the exhaust casing lower half 31D, it is preferable to support the outer support rod 103 connected to the exhaust casing lower half 31D from the outer periphery of the outer support rod 103 by an outer support jig 109.

[0062] According to the method (4) above, the outer support rod 103 connected to the lower half of the exhaust casing 31D can be supported from the outer periphery of the outer support rod 103 by the outer support jig 109, so that the outer support rod 103 can be prevented from tipping over or falling, and workers do not need to support the outer support rod 103.

[0063] (5) In some embodiments, in any of the methods (1) to (4) above, in the step (step S5) of connecting the inner support rod 101 to the lower half 32D of the bearing base, it is preferable to loosely insert the end (protrusion 102) of the inner support rod 101 into the recess 323 provided in the lower half 32D of the bearing base.

[0064] According to the method (5) above, the inner support rod 101 can be easily connected to the bearing pedestal lower half 32D.

[0065] (6) In some embodiments, in any of the methods (1) to (5) above, in the step (step S5) of connecting the outer support rod 103 to the lower half of the exhaust casing 31D, it is preferable to loosely insert the end (protrusion 104) of the outer support rod 103 into the recess 313 provided in the lower half of the exhaust casing 31D.

[0066] According to the above method (6), the outer support rod 103 can be easily connected to the exhaust casing lower half 31D.

[0067] (7) In some embodiments, in any of the methods (1) to (6) above, when assembling the exhaust casing 3, it is advisable to carry out a step (step S7) of supporting the bearing base lower half 32D on the exhaust casing lower half 31D before placing the rotor 16 of the gas turbine 1 on the bearing base lower half 32D.

[0068] According to the method (7) above, the bearing pedestal lower half 32D can be supported by the exhaust casing lower half 31D before undesired deformation of the exhaust casing lower half 31D occurs during assembly of the exhaust casing 3.

[0069] (8) In some embodiments, in any of the methods (1) to (7) above, when disassembling the exhaust casing 3, it is preferable to perform a step (step S7) of supporting the bearing base lower half 32D on the exhaust casing lower half 31D before removing the exhaust casing upper half 31U from the exhaust casing lower half 31D.

[0070] According to the method (8) above, the bearing pedestal lower half 32D can be supported by the exhaust casing lower half 31D before undesired deformation of the exhaust casing lower half 31D occurs when the exhaust casing 3 is disassembled. (9) A support device 100 for a bearing pedestal lower half 32D according to at least one embodiment of the present disclosure is a support device 100 for a bearing pedestal lower half 32D used for disassembling and assembling an exhaust casing 3 of a gas turbine 1. The support device 100 for a bearing pedestal lower half 32D according to at least one embodiment of the present disclosure includes an inner support rod 101 connectable to the bearing pedestal lower half 32D, an outer support rod 103 connectable to the exhaust casing lower half 31D, and an intermediate support member 105 that can be installed between the inner support rod 101 and the outer support rod 103 and that can press the inner support rod 101 radially inward and the outer support rod 103 radially outward. The support device 100 of the bearing base lower half 32D according to at least one embodiment of the present disclosure includes at least one of an inner support jig 107 provided on the inner support rod 101 for supporting the inner support rod 101, or an outer support jig 109 provided on the outer support rod 103 for supporting the outer support rod 103.

[0071] According to the configuration (9) above, the bearing pedestal lower half 32D can be supported by the exhaust casing lower half 31D via the inner support rods 101, the outer support rods 103, and the intermediate support member 105 during disassembly and assembly of the exhaust casing 3, thereby reducing undesired deformation of the exhaust casing lower half 31D during disassembly and assembly of the exhaust casing 3. Furthermore, according to the configuration (9) above, the inner support rods 101 connected to the bearing pedestal lower half 32D can be supported from the outer periphery of the inner support rods 101 by the inner support jig 107, or the outer support rods 103 connected to the exhaust casing lower half 31D can be supported from the outer periphery of the outer support rods 103 by the outer support jig 109. This prevents the inner support rods 101 or the outer support rods 103 from tipping over or falling, eliminating the need for workers to support the inner support rods 101 or the outer support rods 103. This reduces the labor (man-days) required during disassembly and assembly of the exhaust casing 3. [Explanation of symbols]

[0072] 1. Gas turbine 3 Exhaust compartment 4 Struts 5 Strut cover 11 Compressor 13 Turbine 16 rotors 31 Cabin wall 31D Lower half of the casing wall (lower half of the exhaust casing) 31U Upper half of the casing wall (upper half of the exhaust casing) 32 Bearing case (bearing stand) 32D lower half (lower half of bearing stand) 32U upper half (upper half of bearing stand) 33 Outer diffuser 35 Inner diffuser 100 Support device 101 Inner support rod 102 protrusion 103 Outer support rod 104 protrusion 105 Intermediate support member 107 Inner support jig 109 Outside support jig 313 Recess 323 Recess

Claims

1. A method for disassembling and assembling an exhaust casing of a gas turbine, comprising: connecting an inner support rod to the lower half of the bearing pedestal; connecting an outer support rod to the lower half of the exhaust casing; a step of installing an intermediate support member between the inner support rod and the outer support rod, and pressing the inner support rod radially inward via the intermediate support member and pressing the outer support rod radially outward to support the lower half of the bearing pedestal on the lower half of the exhaust casing; a step of supporting the inner support rod connected to the lower half of the bearing pedestal from an outer circumferential side by an inner support jig, or supporting the outer support rod connected to the lower half of the exhaust casing from an outer circumferential side by an outer support jig, prior to carrying out the step of supporting the lower half of the bearing pedestal on the lower half of the exhaust casing; Equipped with Disassembly and assembly method for exhaust casing.

2. in the step of connecting the inner support rods to the lower half of the bearing pedestal, when viewed from an extension direction of a central axis of the rotor of the gas turbine, the two inner support rods are disposed symmetrically across an imaginary line that passes through the central axis and extends in a vertical direction, In the step of connecting the outer support rods to the lower half of the exhaust casing, the two outer support rods are disposed symmetrically across the imaginary line when viewed from the extending direction of the central axis. A method for disassembling and assembling an exhaust casing according to claim 1.

3. In the step of performing at least one of the steps, prior to performing the step of supporting the lower half of the bearing pedestal on the lower half of the exhaust casing, the inner support rod connected to the lower half of the bearing pedestal is supported from an outer circumferential side of the inner support rod by the inner support jig. A method for disassembling and assembling an exhaust casing according to claim 1 or 2.

4. In the step of performing at least one of the steps, prior to performing the step of supporting the lower half of the bearing pedestal on the lower half of the exhaust casing, the outer support rod connected to the lower half of the exhaust casing is supported from an outer peripheral side of the outer support rod by an outer support jig. A method for disassembling and assembling an exhaust casing according to claim 1 or 2.

5. In the step of connecting the inner support rod to the lower half of the bearing base, an end of the inner support rod is loosely inserted into a recess provided in the lower half of the bearing base. A method for disassembling and assembling an exhaust casing according to claim 1 or 2.

6. In the step of connecting the outer support rod to the lower half of the exhaust casing, an end of the outer support rod is loosely inserted into a recess provided in the lower half of the exhaust casing. A method for disassembling and assembling an exhaust casing according to claim 1 or 2.

7. during assembly of the exhaust casing, a step of supporting the lower half of the bearing pedestal on the lower half of the exhaust casing is carried out before disposing the rotor of the gas turbine on the lower half of the bearing pedestal. A method for disassembling and assembling an exhaust casing according to claim 1 or 2.

8. When disassembling the exhaust casing, a step of supporting the lower half of the bearing pedestal on the lower half of the exhaust casing is carried out before removing the upper half of the exhaust casing from the lower half of the exhaust casing. A method for disassembling and assembling an exhaust casing according to claim 1 or 2.

9. A support device for a lower half of a bearing stand used in disassembling and assembling an exhaust casing of a gas turbine, comprising: an inner support rod connectable to the lower half of the bearing base; an outer support rod connectable to the lower half of the exhaust casing; an intermediate support member that can be installed between the inner support rod and the outer support rod, and that can press the inner support rod radially inward and the outer support rod radially outward; Equipped with The apparatus includes at least one of an inner support jig provided for the inner support rod to support the inner support rod, and an outer support jig provided for the outer support rod to support the outer support rod. Support device for the lower half of the bearing base.

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