JP2019112968A - Turbine installation method - Google Patents

Abstract

To shorten a construction period in a power plant.SOLUTION: A turbine installation method includes: a previous temporary assembly/disassembly step for implementing temporary assembly and disassembly of a structure of a turbine in a factory before implementing assembly of the structure in a power plant; and an on-site assembly step for implementing the assembly of the structure of the turbine in the power plant after implementing the temporary assembly and disassembly. The previous temporary assembly/disassembly step includes a first core position adjustment step for adjusting a core position of a lower half internal structure in a state where the lower half internal structure is mounted inside of a lower half structure that constitutes the turbine.SELECTED DRAWING: Figure 6A

Description

  Embodiments of the present invention relate to a turbine installation method.

  Generally, the steam turbine has an upper and lower half structure, and includes an lower half structure (lower half casing), a lower half internal structure disposed inside the lower half structure, and the lower half structure. The upper half structure (upper half car room) disposed on the object and the upper half inner structure disposed inside the upper half structure are provided. A rotor, which is a rotating body, is housed inside a structure (upper and lower half internal structures) configured by combining the lower half internal structure and the upper half internal structure. The rotor is provided with a plurality of blades. On the other hand, the upper and lower half internal structure is provided with a plurality of nozzles. Each nozzle is disposed between the blades of the rotor and directs steam to each blade.

Unexamined-Japanese-Patent No. 2002-364309

  A seal component provided with a seal mechanism that prevents steam from leaking in the axial direction of the rotor is disposed between the rotary shaft (shaft) of the rotor and the upper and lower half internal structures. The sealing parts are attached to the upper and lower half internal structure. The clearance between the seal part and the shaft is set very narrow to prevent steam leakage, but the rotor, upper and lower semistructures and upper and lower half internal structures are assembled so that the seal parts do not contact the shaft. It is important to have an appropriate gap. If this proper clearance is not ensured, the seal components may contact the shaft during operation of the steam turbine, causing damage or vibrations in the shaft or upper and lower half internals.

  The gap between the shaft and the seal part is set in a state in which the upper half structure and the upper half inner structure are disassembled with respect to the lower half structure and the lower half internal structure, but the upper half structure and the upper A part of any structure is deformed from the state where the semi-internal structure is not attached (decomposed state) to the state where the upper semi-structure and the upper half internal structure are attached (assembled state) Then, the core position of the lower half inner structure changes. Further, even when the lower half structure is connected to the steam pipe, the core position of the lower half inner structure changes because the lower half structure is bent by the reaction force from the steam pipe. Therefore, it is required to offset and install the core position of the lower half inner structure in advance in a state where the upper half structure and the upper half inner structure are disassembled after grasping the amount of change in advance. . The reaction force from the steam piping can not be ignored not only in the installation work of the new turbine, but also in the renewal work of the cabin and the like of the existing turbine. In particular, an excessive pipe reaction force may act on the lower half structure of the steam turbine of the aged plant as compared with the construction installation state.

  From this, in the conventional assembly process, with the upper half structure attached to the lower half structure in the power plant, the steam piping is connected to the lower half structure, and the core position of the lower half inner structure Then, remove the upper half structure from the lower half structure, and then check the core position of the lower half internal structure to measure the amount of change in the core position of the lower half internal structure. There is. As described above, the conventional assembly process is a factor that hinders the shortening of the construction period because a retrogressive operation of temporary assembly and disassembly occurs in the power generation plant.

  The problem to be solved by the present invention is to provide a turbine installation method that enables shortening of the installation period in a power plant.

The turbine installation method according to the embodiment includes a pre-temporary disassembly and disassembly step of performing disassembly and disassembly of the structure in a factory before the disassembly of the structure of the turbine is performed in a power plant. After the implementation of the above, the on-site assembly step of assembling the turbine structure at the power plant, the pre-temporary assembly and disassembly step comprising the lower half inside the lower half structure constituting the turbine. The first core position adjusting step of adjusting the core position of the lower half inner structure with the inner structure attached is included.

The figure which shows an example of schematic structure of the steam turbine implement | achieved by the turbine installation method which concerns on 1st thru | or 3rd embodiment. FIG. 7 is a view showing a partial cross-sectional shape of a portion of the lower half internal structure 3 attached to the inside of the lower half structure 2 shown in FIG. 1 as viewed from a direction parallel to the rotation axis of the rotor 7; The figure which shows that there is a gap between the seal part 8 attached to the nozzle 3a of the lower half structure 2, and the shaft of the rotor 7. The figure which shows an example of the process before the steam piping 6 is connected to each piping connection part 2a of the lower half structure 2. FIG. FIG. 3 is a view showing an example of various processes constituting the turbine installation method according to the first embodiment. The figure which shows an example of the first half part of the various processes in a pre-provisional disassembly process (S1). The figure which shows an example of the second half part of the various processes in a pre-provisional disassembly process (S1). The figure which shows an example of the first half part of the various processes in a field assembly process (S3). The figure which shows an example of the second half part of the various processes in a field assembly process (S3). The figure which shows the state before connecting the steam piping 6 to each piping connection part 2a of the lower half structure 2. FIG. The figure which shows the state after connecting the steam piping 6 to each piping connection part 2a of the lower half structure 2. FIG. The figure which shows an example of the various processes which comprise the turbine installation method which concerns on 2nd and 3rd embodiment. The figure which shows an example of the various processes in the field disassembly process (S3A) in 2nd Embodiment. The figure which shows an example of the various processes in the field assembly process (S3B) in the same embodiment. The figure which shows the example of a part of various process in the field disassembly process (S3A) in 3rd Embodiment. The figure which shows the example of a part of various process in the field disassembly process (S3A) in the embodiment. The figure which shows the example of a part of various process in the field assembly process (S3B) in the embodiment. The figure which shows the example of a part of various process in the field assembly process (S3B) in the embodiment. The figure which shows the example of a part of various process in the field assembly process (S3B) in the embodiment. FIG. 6 is a view showing an example of various information used for load adjustment in the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
First, the first embodiment will be described.

  FIG. 1 is a view showing an example of a schematic configuration of a steam turbine (hereinafter, “turbine”) realized by the turbine installation method according to the first embodiment. In addition, this FIG. 1 is applied also to each embodiment mentioned later.

  FIG. 1 shows how a turbine after completion of installation in a certain power plant is viewed horizontally from a direction perpendicular to the rotational axis of the rotor. In FIG. 1, for convenience, internal structures and rotors inside the casing of the turbine are represented in a visible manner.

  The turbine has an upper and lower half split structure, and includes a bearing stand 1 (support), a lower half structure (lower casing) 2 supported by the bearing stand 1, and an inside of the lower half structure 2 A plurality of lower half internal structures 3 disposed in the upper half structure, an upper half structure (upper half casing) 4 disposed on the lower half structure 2, and the inside of the upper half structure 4 A plurality of upper semi-internal structures 5 are provided.

  A plurality of pipe connection parts 2a are provided below the lower half structure 2, and a steam pipe 6 is connected to each pipe connection part 2a. In addition, inside the structure (upper and lower half inner structures) configured by combining the plurality of lower half inner structures 3 and the plurality of upper half inner structures 5, the rotor 7 that is a rotating body is stored. There is. The rotor 7 is composed of a shaft, which is a rotating shaft, and a plurality of blades.

  FIG. 2 shows a partial sectional shape when a portion of the lower half internal structure 3 attached to the inside of the lower half structure 2 shown in FIG. 1 is viewed from the direction parallel to the rotation axis of the rotor 7 FIG. In addition, since the shape of the upper half internal structure 5 attached to the inside of the upper half structure 4 becomes the same as the shape shown in FIG. 2, the illustration is abbreviate | omitted.

  The lower half structure 2 is provided in advance with a groove for accommodating the respective lower half internal structure 3, and the lower half internal structure 3 is accommodated in the groove. In the state where each lower half internal structure 3 is housed in the groove of the lower half structure 2, the upper surface of the lower half structure 2 and the upper surface of each lower half internal structure 3 are one continuous horizontal surface Form

  In FIG. 2, the position (core position) C of the core of the lower half internal structure 3 housed in the lower half structure 2 is shown. A semicircular arc is formed on the inner surface H of the lower half internal structure 3. The center point of the semicircle formed by the arc corresponds to the core position C of the lower half internal structure 3. It is desirable that the core position C of the lower half inner structure 3 coincide with the central position of the shaft of the rotor 7 after the installation of the turbine.

  FIG. 3 is a view showing that there is a gap between the seal component attached to the nozzle of the lower half structure 2 and the shaft of the rotor 7.

  Between the shaft of the rotor 7 and the nozzle 3a provided on the lower half internal structure 3 (or upper half internal structure 5), a seal part 8 having a seal mechanism for preventing leakage of steam in the rotor axial direction is provided. Be placed. The seal component 8 is attached to, for example, the nozzle 3a.

  The gap G between the seal part 8 and the shaft of the rotor 7 is set extremely narrow to prevent steam leakage, but the rotor 7 and the upper and lower semistructures and the upper and lower halfs are set so that the seal parts do not contact the shaft of the rotor 7 It is important that proper clearances be established with the internal structure. If this proper gap is not secured, the seal parts may contact the shaft of the rotor 7 during operation of the turbine, and damage or vibration may occur in the shaft or upper and lower half internal structures of the rotor 7.

  The gap G between the shaft of the rotor 7 and the seal part 8 is set for the lower half structure 2 and the lower half internal structure 3 in a state where the upper half structure 4 and the upper half internal structure 5 are disassembled Until the upper half structure 4 and the upper half inner structure 5 are attached (assembled state) from the state where the upper half structure 4 and the upper half inner structure 5 are not attached (decomposed state) The core position C of the lower half internal structure 3 changes, for example, when a part of one of the structures is deformed (during tightening of the upper and lower half structures using a bolt, for example). If it is attempted to collectively adjust the core position C in the power plant in consideration of the change in the core position C of the lower half internal structure 3, the construction period will be prolonged. Therefore, in the present embodiment, from the viewpoint of shortening the construction period in the power generation plant, at least a part of the process for adjusting the core position C is not performed in the power generation plant but a turbine structure It will be carried out in the process of temporary assembly and disassembly at the factory before shipping to the power plant.

  FIG. 4 is a view showing an example of a process before the steam pipe 6 is connected to each pipe connection portion 2 a of the lower half structure 2.

  Since the lower half structure 2 is bent by the reaction force from the steam piping 6 even when the steam piping 6 is connected, the core position C of each lower half internal structure 3 changes. In the present embodiment, as in the above, from the viewpoint of shortening the construction period in the power plant, a part of the process for adjusting the core position C (each lower inner structure before the steam pipe 6 is connected In the process of temporary assembly and disassembly in the factory before shipping the structure of the turbine from the factory to the power plant instead of carrying out the process of confirming the core position C of object 3 in the power plant To carry out.

  FIG. 5: is a figure which shows an example of the various processes which comprise the turbine installation method which concerns on this embodiment.

  The turbine installation method according to the present embodiment includes a pre-temporary assembly / disassembly process (S1), a shipping / transporting process (S2), and a field assembly process (S3).

  The pre-temporary assembly / disassembly step (S1) is a step of performing temporary assembly and disassembly of the structure in a factory before the assembly of the structure of the turbine is performed in the power plant.

  In particular, this pre-temporary assembly / disassembly step (S1) is performed prior to assembly of upper semistructure 4 in anticipation of changes in the core position of each lower internal structure 3 during assembly of upper semistructure 4. And adjusting the core position of the lower half inner structure 3 in advance with the lower half inner structures 3 attached to the inside of the lower half structure 2.

  Also, in this pre-temporary assembly / disassembly step (S1), before the lower half structure 2 is bent by the connection of the steam piping 6, the height of the upper surface of each lower half internal structure 3 or the lower half corresponding thereto The process of measuring the height of the predetermined position of the upper surface of the structure 2 is included.

  The shipping and transporting step (S2) is a step of shipping and transporting the turbine structure that has completed the preliminary assembly / disassembly step (S1) from the factory to the power plant.

  The on-site assembly step (S3) is a step of assembling the structure of the turbine transported from the factory to the power plant in the power plant.

  Here, various steps in the pre-temporary assembly / disassembly step (S1) will be described with reference to FIGS. 6A and 6B.

  First, after preparing the turbine installation stand 9 at the factory, the lower half structure 2 which is the lower half cabin is disposed on the turbine installation stand 9 (S11), and the level adjustment of the lower half structure 2 (turbine installation Adjustment of the load of each part of the lower half structure 2 supported by the gantry 9 is performed (S12).

  Next, each lower half internal structure 3 is attached to the lower half structure 2 (S13), and the height of the upper surface of each lower half internal structure 3 or a predetermined upper surface of the lower half structure 2 corresponding thereto The height of the position of is measured (S14). That is, the deflection amount of the lower half structure 2 before connection of the steam piping 6 is measured. The measurement result is recorded on a predetermined recording medium.

  The position to be subjected to height measurement in step S14 is, for example, the position indicated by arrow A. Specifically, for example, as a predetermined position of the upper surface on the lower semistructure 2 side near the boundary between the upper surface of the lower semistructure 2 forming one continuous horizontal surface and the upper surface of each lower semi-internal structure 3 It is also good.

  Further, the height measurement at this time does not measure the height from the floor surface to the target position, and for example, a predetermined position where bending of the lower half structure 2 is hard to occur (for example, the lower half structure 2 The height of the upper surface of the portion supported by the bearing stand 1 may be used as a reference height, and the height difference from the reference height to the target position may be measured.

  Next, the upper half structure 4 is mounted on the lower half structure 2 to which each lower half inner structure 3 is attached (S15), and the core position of each lower half inner structure 3 is measured in that state To do (S16). The measurement result is recorded on a predetermined recording medium. Although the upper half inner structure 5 is not shown in the example of FIG. 6A, the upper half structure 4 may be attached after the upper half inner structure 5 is attached.

  Next, the upper half structure 4 is removed (S17), and in this state, the core position of each lower half internal structure 3 is measured (S18). The measurement result is recorded on a predetermined recording medium.

  Next, according to the amount of change (size and direction) from the core position of each lower half inner structure 3 measured in step S16 to the core position of each lower half inner structure 3 measured in step S18, The core position of each lower half internal structure 3 attached to the lower half structure 2 is adjusted (S19). That is, even if the core position of each lower half internal structure 3 changes when the upper half structure 4 is mounted in the power plant, the core position is located at the target position (center position of the shaft of the rotor 7). , The core position of each lower half internal structure 3 before attaching the upper half structure 4 is offset.

  Next, the rotor 7 is suspended (S20), and the axial and radial gaps between the rotor 7 and the respective lower half internal structures 3 are measured (S21). At that time, it is confirmed whether the interval satisfies a predetermined standard. If it does not meet the standard, process etc. to meet the standard.

  Next, the rotor 7 is suspended (S22), and the individual lower half internal structures 3 are removed (S23). Finally, the lower half structure 2 is removed (S24).

  Thus, when the preliminary assembly / disassembly step (S1) is completed, in the next shipping / transporting step (S2), the individual components of the turbine are disassembled, and shipped and transported to the power plant ((2) S25).

  Next, various steps in the on-site assembly step (S3) will be described with reference to FIGS. 7A and 7B.

  First, in the power plant, after the bearing stand (challenge) 1 is installed, the lower half structure 2 which is the lower half compartment is disposed on the bearing stand 1 (S31), and the level adjustment of the lower half structure 2 Adjustment of the load of each part of the lower half structure 2 supported by the bearing stand 1 is performed (S32).

  Next, each lower half internal structure 3 is attached to the lower half structure 2 (S33).

  Next, the steam pipe 6 is connected to each pipe connection portion 2a of the lower half structure 2 by welding or the like (S34). A state in which the lower half structure 2 is bent at this time is shown in FIGS. 8A and 8B. FIG. 8A shows a state before the steam piping 6 is connected to each piping connection portion 2a of the lower half structure 2, and FIG. 8B shows that the steam piping 6 is connected to each piping connection portion 2a of the lower half structure 2. It shows the state after. As can be seen from FIGS. 8A and 8B, when the steam pipe 6 is connected to each pipe connection portion 2a of the lower half structure 2 by welding or the like, the lower half structure 2 is bent by the reaction force from the steam pipe 6. Along with this, the core position of each lower half internal structure 3 moves downward.

  Next, the height of the upper surface of each lower half internal structure 3 or the height of a predetermined position on the upper surface of the lower half structure 2 corresponding thereto is measured (S35). That is, the deflection amount of the lower half structure 2 after connection of the steam piping 6 is measured. The measurement result is recorded on a predetermined recording medium.

  The position to be subjected to height measurement in step S35 is, for example, the position indicated by arrow A. Specifically, for example, as a predetermined position of the upper surface on the lower semistructure 2 side near the boundary between the upper surface of the lower semistructure 2 forming one continuous horizontal surface and the upper surface of each lower semi-internal structure 3 It is also good.

  Further, the height measurement at this time does not measure the height from the floor surface to the target position, and for example, a predetermined position where bending of the lower half structure 2 is hard to occur (for example, the lower half structure 2 The height of the upper surface of the portion supported by the bearing stand 1 may be used as a reference height, and the height difference from the reference height to the target position may be measured.

  Next, the individual measured in step S35 from the height of the upper surface of each lower half internal structure 3 measured in step S14 described above or the height of a predetermined position on the upper surface of lower half structure 2 corresponding thereto Based on the amount of change to the height of the upper surface of the lower half inner structure 3 or the height of the predetermined position of the upper surface of the lower half structure 2 corresponding thereto, the individual lower half inner structure 3 set in advance The core position of each lower half internal structure 3 in a state where the steam pipe 6 is connected to the lower half structure 2 is adjusted (S36) so that the core position of the lower half structure 2 is reproduced.

  Next, the rotor 7 is hung (S37).

  Next, the individual upper-half internal structure 5 is mounted on the lower-half structure 2 to which the individual lower-half internal structure 3 is attached (S38), and the upper-half structure 4 is further mounted (S39).

  Thus, the on-site assembly process (S3) is completed.

  Thus, in the present embodiment, the amount of change in the core position of each lower internal structure 3 that changes between the state in which the upper half structure 4 is not attached to the lower half structure 2 and the state in which it is attached is The core position adjustment in consideration is not performed in the power generation plant, but is performed in advance in the factory as shown in step S19 of FIG. 6A. In addition, before connecting the steam piping 6 to the lower half structure 2, the height of the upper surface of each lower half internal structure 3 or the height at a predetermined position on the upper surface of the lower half structure 2 corresponding thereto The measurement is not performed in the power generation plant, but is performed in advance in the factory as shown in step S14 of FIG. 6A. However, what is shown in Drawing 6A, Drawing 6B, Drawing 7A, and Drawing 7B is an example, and it is not limited to this.

  According to the first embodiment, at least a part of the process for adjusting the core position of each lower internal structure 3 is not performed in the power plant, but the turbine structure is converted from the plant to the power plant Since it carries out in a factory before shipping to the end, it will be possible to shorten the construction period in the power plant without the occurrence of reworking work of temporary assembly and disassembly in the power plant. In addition, since the core position of each lower half internal structure 3 is adjusted in advance in the factory, the adjustment amount of the core position of each lower half internal structure 3 in the power generation plant is small, and extensive processing is not performed. It is

Second Embodiment
Next, a second embodiment will be described. In the following, parts different from the first embodiment will be mainly described.

  In addition, FIG. 1 thru | or FIG. 4 mentioned above are suitably used also in this embodiment.

  In this embodiment, an example in the case of performing replacement work (update work) of a structure of an existing turbine will be described. In this replacement work, disassembly and removal of existing structures and installation of new structures will be performed. In this case, it is assumed that the new structure and the existing structure have the same structure and material, and the connection positions of the steam pipes coincide with each other.

  FIG. 9 is a view showing an example of various steps constituting the turbine installation method according to the second embodiment. The same steps as in FIG. 5 are denoted by the same reference numerals.

  The turbine installation method according to the present embodiment includes a pre-temporary assembly / disassembly process (S1), a shipping / transporting process (S2), an on-site disassembly process (S3A), and a on-site assembly process (S3B).

  The pre-temporary assembly / disassembly step (S1) and the shipping / transporting step (S2) are as described above, and thus the description thereof is omitted.

  The on-site disassembling step (S3A) is a step of disassembling the existing turbine structure in the power plant before the assembly of the turbine structure transported from the factory to the power plant is performed in the power plant. .

  The on-site assembly process (S3B) is a process of assembling the structure of a new turbine transferred from a factory to a power plant in the power plant.

  In particular, in the on-site disassembling step (S3A), before the steam piping 6 is separated from the existing lower half structure 2 (hereinafter, "lower half structure 2 '"), the existing individual lower half internal structures 3 (below Measuring the height of the upper surface of the “lower half internal structure 3 ′” or the height of a predetermined position of the upper surface of the lower half structure 2 ′ corresponding thereto, and the lower half structure of the steam pipe 6 Measuring the height of the predetermined position of the upper surface of the lower half structure 2 ′ corresponding to the height of the upper surface of each lower half internal structure 3 ′ after being separated from 2 ′.

  Also, in the on-site assembly process (S3B), the lower half structure that is the lower half vehicle room of the new construction based on the amount of height change of the predetermined position before and after separation of the steam piping 6 measured in the on-site disassembly process (S3A). Adjusting the core position of each lower half internal structure 3 attached to 2;

  Next, various steps in the on-site disassembly step (S3A) will be described with reference to FIG. 10A.

  Although not shown in FIG. 10A, first, the upper half structure of the existing structures is disassembled and the rotor 7 is suspended.

  After lifting the rotor 7, in a state before separating the individual steam pipes 6 from the lower half structure 2 'which is the existing lower half car room, the height of the upper surface of each lower half internal structure 3' or this The height of the predetermined position of the upper surface of the corresponding lower half structure 2 'is measured (S41). That is, the deflection amount of the lower half structure 2 'before the steam piping 6 is cut off is measured. The measurement result is recorded on a predetermined recording medium.

  Next, the individual steam pipes 6 are separated from the lower half structure 2 ', and the upper surface of each lower half internal structure 3' or the corresponding upper surface of the lower half structure 2 'at a predetermined position The height is measured (S42). That is, the deflection amount of the lower half structure 2 'after the steam piping 6 is separated is measured. The measurement result is recorded on a predetermined recording medium.

  The position to be subjected to height measurement in steps S41 and S42 is, for example, the position indicated by arrow A. Specifically, for example, a predetermined upper surface of the lower half structure 2 'near the boundary between the upper surface of the lower half structure 2' forming one continuous horizontal surface and the upper surface of each lower half internal structure 3 ' The position of the

  Further, the height measurement at this time does not measure the height from the floor surface to the target position, and for example, a predetermined position (for example, the lower half structure 2) in which deflection of the lower half structure 2 'is difficult to occur The height of the upper surface of the portion supported by the bearing stand 1 of 'is set as a reference height, and the height difference from the reference height to the target position may be measured.

  Thus, the on-site disassembly process (S3A) is completed.

  Next, various steps in the on-site assembly step (S3B) will be described with reference to FIG. 10B.

  First, lower half structure 2 to be a new lower half casing is disposed on bearing base 1 (S51), and level adjustment of lower half structure 2 (each part of lower half structure 2 supported by bearing base 1) Adjustment of the load, etc.) (S52).

  Next, each lower half internal structure 3 is attached to the lower half structure 2 (S53).

  Next, the steam pipe 6 is connected to each pipe connection portion 2a of the lower half structure 2 by welding or the like (S54).

  Next, the rotor 7 is hung (S55).

  Next, the individual upper half internal structure 5 and the upper half structure 4 are attached onto the lower half structure 2 to which the individual lower half internal structures 3 are attached, and then the steam piping 6 is attached to the lower half. The core position adjustment of each lower half internal structure 3 in a state of being connected to the structure 2 is performed (S56). Specifically, from the height of the upper surface of each lower half internal structure 3 'measured in step S41 described above or the height of a predetermined position on the upper surface of lower half structure 2' corresponding thereto, step S42. Based on the amount of change to the height of the upper surface of the individual lower half internal structure 3 'or the height corresponding to the height of the upper surface of the lower half structure 2' corresponding thereto, The core position of each lower half internal structure 3 in a state where the steam piping 6 is connected to the lower half structure 2 is adjusted so that the core position of the lower half internal structure 3 'is reproduced.

  That is, the core position variation of the lower half internal structure 3 before and after the connection of the steam piping 6 to the newly constructed lower half structure 2 is predicted from the deflection variation before and after the separation of the steam piping 6 relative to the lower half structure 2 '. Therefore, the core position set in advance is reproduced by adjusting the arrangement position of each lower half internal structure 3 or lower half structure 2 using the predicted core position variation.

  Thus, the on-site assembly process (S3B) is completed.

  In the example of the procedure described above, the case of performing the step (S56) of adjusting the core position of each lower half internal structure 3 after the step (S55) of hanging the rotor is exemplified. Not limited to this. For example, the step (S56) of adjusting the core position of each lower half internal structure 3 may be performed before the step (S55) of suspending the rotor. For example, in parallel with the step (S54) of connecting the steam piping 6 to each pipe connection portion 2a of the lower half structure 2, the step (S56) of adjusting the core position of each lower half internal structure 3 is performed. You may do so. In that case, it is possible to further shorten the construction period of the on-site assembly process.

  According to the second embodiment, when replacing the structure of the existing turbine in the power plant, the height measurement before and after the separation of the steam pipe 6 with respect to the lower half structure 2 ′ is performed, and the measurement result is By using it, it is possible to adjust the core position of each lower half internal structure 3 in a state where the steam piping 6 is connected to the lower half structure 2, so that the steam piping 6 for the newly constructed lower half structure 2 This eliminates the need for the step of measuring the height before and after the connection, and can shorten the construction period of the on-site assembly process.

Third Embodiment
Next, a third embodiment will be described. In the following, parts different from the second embodiment will be mainly described.

  Note that FIGS. 1 to 10B described above are appropriately used also in this embodiment.

  In this embodiment, the case of including the step of adjusting the load of the lower half structure 2 which changes due to the connection of the steam piping 6 in the replacement work of the existing turbine structure described in the second embodiment will be described.

  In this embodiment, before the steam piping 6 is separated from the lower half structure 2 'which is the existing lower half car room in the on-site disassembly process (S3A) shown in FIG. 9, the bearing base of the lower half structure 2' The first load measuring step of measuring the load on the bearing stand 1 on 1 and the load on the bearing stand 1 of the lower semi-structure 2 'after the steam piping 6 is separated from the lower semi-structure 2' And a second load measuring step.

  Further, in the present embodiment, in the on-site assembly step (S3B) shown in FIG. 9, before connecting the steam pipe 6 to the lower half structure 2 to be the lower half casing of the new construction, the bearing of the lower half structure 2 The third load measurement step of measuring the load on the table 1, and the fourth load measurement of measuring the load on the bearing stand 1 of the lower half structure 2 after connecting the steam piping 6 to the lower half structure 2. Step and the amount of change from the load of the lower half structure 2 'measured in the first load measurement step to the load of the lower half structure 2' measured in the second load measurement step and the third load measurement step From the steam piping 6 acting on the lower half structure 2 so that the amount of change from the load of the lower half structure 2 measured to the load of the lower half structure 2 measured in the fourth load measurement step becomes equal Load adjustment process for adjusting the load on the bearing base 1 of the lower half structure 2 by adjusting the reaction force of , Including the.

  Next, various steps in the on-site disassembling step (S3A) will be described with reference to FIGS. 11A and 11B.

  FIG. 11A (a) shows the lower half structure 2 'and the lower half internal structure 3', which are the existing lower half cabins before the steam piping is separated, as viewed from above from above. (B) of the same figure shows a situation when the same object is viewed horizontally from the side.

  (A) of FIG. 11B shows a state when the lower half structure 2 'and the lower half internal structure 3' which are the existing lower half casings after separating the steam piping are viewed vertically from above. (B) of the same figure shows the situation when the same thing is seen horizontally from the side.

  First, the upper half structure of the existing structures is disassembled and the rotor 7 is suspended.

  After lifting the rotor 7, as shown in FIG. 11A, the load on the bearing base 1 of the lower half structure 2 'is measured in a state before separating the individual steam pipes 6 from the lower half structure 2' (S61 ). Specifically, respective loads are measured at the support positions 21a ', 21b', 21c 'and 21d' indicated by the arrow W in FIG. 11A (S61). The measurement result is recorded on a predetermined recording medium.

  Next, as shown in FIG. 11B, in a state after separating the individual steam pipes 6 from the lower half structure 2 ′ and separating the individual steam pipes 6 from the lower half structure 2 ′, the lower half structure 2 The load on the bearing stand 1 of 'is measured (S62). Specifically, the respective loads are measured at the support positions 21a ', 21b', 21c 'and 21d' indicated by the arrow W in FIG. 11B (S62). The measurement result is recorded on a predetermined recording medium.

  Next, various steps in the on-site assembly step (S3B) will be described with reference to FIGS. 12A, 12B, and 12C.

  FIG. 12A (a) shows the lower half structure 2 and the lower half inner structure 3 which are new lower half cabins before the steam piping are connected, viewed from the top in the vertical direction. (B) of the figure shows the situation when the same object is viewed horizontally from the side.

  FIG. 12B (a) shows the lower half structure 2 and the lower half inner structure 3 which are new lower half cabins after connecting steam piping, viewed from the top in the vertical direction. (B) of the figure shows the situation when the same object is viewed horizontally from the side.

  (A) of FIG. 12C shows a mode when the lower half structure 2 and the lower half internal structure 3 which are load-adjusted after connecting steam piping are seen from the top in the vertical direction, and (b) of the same figure Shows the situation when the same thing is seen horizontally from the side.

  The piping reaction force adjustment mechanism 22 shown in FIG. 12C is used to adjust the reaction force from the steam piping 6 acting on the lower half structure 2, and the steam valve provided on the steam piping 6 Apply a force upward or downward to 10. The force that the pipe reaction force adjustment mechanism 22 applies to the steam valve 10 (and the steam pipe 6) and the direction thereof are variable.

  Although only one steam valve 10 and only one piping reaction force adjustment mechanism 22 are illustrated in the example of FIG. 12C, in the present embodiment, the steam valve 10 is installed in each of the steam pipes 6, and After the reaction force adjustment mechanism 22 is installed, load adjustment of the lower half structure 2 is performed using a plurality of pipe reaction force adjustment mechanisms 22.

  First, as shown in FIG. 12A, the lower half structure 2 to be a new lower half casing is disposed on the bearing base 1, and the individual lower half inner structures 3 are attached to the lower half structure 2. Before the individual steam pipes 6 are connected to the lower half structure 2, the load on the bearing base 1 of the lower half structure 2 is measured (S71). Specifically, each load is measured at the support positions 21a, 21b, 21c and 21d shown by the arrow W in FIG. 12A (S71). The measurement result is recorded on a predetermined recording medium.

  Next, as shown in FIG. 12B, in a state after connecting the steam piping 6 to each piping connection portion 2a of the lower half structure 2 by welding or the like and connecting the individual steam piping 6 to the lower half structure 2 The load on the bearing stand 1 of the lower half structure 2 is measured (S72). Specifically, each load is measured at the support positions 21a, 21b, 21c and 21d shown by the arrow W in FIG. 12B (S72). The measurement result is recorded on a predetermined recording medium.

  Next, the amount of change from the load of the lower half structure 2 'measured in step S61 to the load of the lower half structure 2' measured in step S62 and the load of the lower half structure 2 measured in step S71 As shown in FIG. 12C, the reaction force from the individual steam piping 6 acting on the lower half structure 2 is made to be equal to the amount of change to the load of the lower half structure 2 measured in S72, The load on the bearing base 1 of the lower half structure 2 is adjusted by adjusting the steam valve 10 of the steam pipe 6 with the pipe reaction force adjusting mechanism 22 which applies a force upward or downward (S73).

  Specifically, the following process is performed.

  First, as shown in FIG. 13A, the measured values of the loads at the support positions 21a ', 21b', 21c 'and 21d' measured in step S61 are a1, b1, c1 and d1. I assume. Further, it is assumed that the measurement values of the respective loads at the support positions 21a ', 21b', 21c 'and 21d' measured in step S62 are a2, b2, c2 and d2. Then, based on these measured values, the load change amount X before and after separation of the steam pipe 6 is calculated by the following equation.

Load variation X = | (a1 + b1 + c1 + d1)-(a2 + b2 + c2 + d2) |
Moreover, as shown in FIG.13 (b), the measured value of each load in the support position 21a, 21b, 21c, 21d measured by step S71 shall be a3, b3, c3, d3. The measurement values of the loads at the support positions 21a, 21b, 21c, 21d measured in step S72 are a4, b4, c4, d4. Then, based on these measured values, the load change amount Y before and after the connection of the steam pipe 6 is calculated by the following equation.

Load change amount Y = | (a3 + b3 + c3 + d3)-(a4 + b4 + c4 + d4) |
Then, the plurality of pipe reaction force adjusting mechanisms 22 are adjusted so that the load change amount X and the load change amount Y become equal, that is, as shown in FIG. 13C, | X−Y | becomes 0. The adjustment of the respective loads at the support positions 21a, 21b, 21c and 21d is performed using In this case, with the individual steam pipes 6 connected to the lower half structure 2, the load of the steam valve 10 of the individual steam pipes 6 is shared and adjusted by the corresponding individual pipe reaction force adjustment mechanisms 22. Thus, the reaction force from the individual steam piping 6 to the lower half structure 2 is adjusted, thereby adjusting the load at the support positions 21a, 21b, 21c, 21d of the lower half structure 2 (S73).

  After the load adjustment is performed, the rotor 7 is suspended, and the upper half internal structure 5 and the upper half structure 4 are assembled.

  According to the third embodiment, when replacing the structure of the existing turbine in the power plant, load measurement before and after the separation of the steam piping 6 to the lower half structure 2 ′ is performed, and the measurement result is used By doing this, load adjustment in a state where the steam piping 6 is connected to the lower half structure 2 can be easily performed, so that the construction period of the on-site assembly process can be shortened.

  As described above, according to each embodiment, it is possible to shorten the construction period of the power generation plant.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  DESCRIPTION OF SYMBOLS 1 ... bearing stand (mount), 2 ... lower half structure, 3 ... lower half internal structure, 4 ... upper half structure, 5 ... upper half internal structure, 6 ... steam piping, 7 ... rotor, 8 ... seal Parts 9 ... Turbine installation stand, 10 ... steam valve.

Claims (11)

A pre-temporary disassembly and disassembly process in which the disassembly and disassembly of the structure is performed in a factory before the assembly of the structure of the turbine is performed in a power plant;
And, after the temporary assembly and disassembly, assembling the turbine structure at the power plant.
In the pre-provisional assembly and disassembly step, the first core position adjustment for adjusting the core position of the lower half internal structure in a state where the lower half internal structure is attached to the inside of the lower half structure constituting the turbine Including the process,
Turbine installation method. The first core position adjusting step is
The lower half inner portion based on the amount of change in the core position of the lower half inner structure changing between the state where the upper half structure constituting the turbine is not attached to the upper half structure and the state where the upper half structure is attached to the lower half structure. Including adjusting the core position of the structure,
The turbine installation method according to claim 1. The pre-provisioning and disassembly process is
A first core position confirmation step of confirming a core position of the lower half internal structure in a state where the upper half structure constituting the turbine is attached to the lower half structure;
A second core position confirmation step of confirming the core position of the lower half internal structure in a state where the upper half structure is not attached to the lower half structure;
The first core position adjusting step is
Adjusting the core position of the lower half internal structure based on the amount of change from the core position confirmed in the first core position confirmation step to the core position confirmed in the second core position confirmation step ,
The turbine installation method according to claim 1. The on-site assembly process is
A second core position adjustment, in which the lower half inner structure is attached to the inside of the lower half structure, and the core position of the lower half inner structure is adjusted in a state where a pipe is connected to the lower half structure. Including the process,
The turbine installation method according to any one of claims 1 to 3. The second core position adjusting step is
The height of the upper surface of the lower half inner structure or the predetermined upper surface of the lower half structure corresponding to this changes between the state where the pipe is not connected to the lower half structure and the state where it is connected Adjusting the core position of the lower half internal structure based on the amount of change in height of the position;
The turbine installation method according to claim 4. The pre-provisioning and disassembly process is
In a state where the pipe is not connected to the lower half structure, the height of a predetermined position of the upper surface of the lower half internal structure or the upper surface of the lower half structure corresponding thereto is measured Further includes a height measurement process of 1,
The on-site assembly process is
Second, the height of a predetermined position of the upper surface of the lower half structure or the height corresponding to the height of the upper surface of the lower half internal structure is measured while the pipe is connected to the lower half structure. Further includes a height measurement process,
The second core position adjusting step is
Adjusting the core position of the lower half internal structure based on the amount of change from the height measured in the first height measurement step to the height measured in the second height measurement step ,
The turbine installation method according to claim 4. The method further includes an on-site disassembling step of disassembling the existing turbine structure in the power plant before the assembly of the turbine structure is performed in the power plant.
The second core position adjusting step is
The height of the upper surface of the existing lower half internal structure or the upper surface of the existing lower structural member corresponding thereto which changes before and after separating the pipe from the existing lower structural member in the on-site disassembly process Adjusting the core position of the lower half internal structure based on the amount of change in height of the predetermined position,
The turbine installation method according to claim 4. The on-site disassembly process is
Before separating the pipe from the existing lower half structure, measure the height of the upper surface of the existing lower half internal structure or the height of a predetermined position of the upper surface of the existing lower half structure corresponding thereto A third height measuring step,
After separating the piping from the existing lower half structure, the height of the upper surface of the existing lower half internal structure or the height of a predetermined position on the upper surface of the existing lower half structure corresponding thereto is And a fourth height measuring step of measuring
The second core position adjusting step is
Adjusting the core position of the lower half internal structure based on the amount of change from the height measured in the third height measurement step to the height measured in the fourth height measurement step ,
The turbine installation method according to claim 4. The second core position adjusting step is performed in parallel with the step of connecting the pipe,
A turbine installation method according to claim 7 or 8. The on-site assembly process is
In the on-site disassembling process, the amount of change in load of the lower half structure that changes before and after separating the piping from the existing lower half structure and connecting the piping to the lower half structure in the on-site assembly process By adjusting the reaction force from the pipe acting on the lower half structure by the pipe reaction force adjustment mechanism so that the amount of change in load of the lower half structure that changes before and after becomes equal. The method further includes a load adjustment step of adjusting the load on the lower half structure mount.
A turbine installation method according to claim 7 or 8. The on-site disassembly process is
The first load measuring step of measuring the load on the frame of the existing lower half structure before the piping is separated from the existing lower half structure, and the piping is separated from the existing lower half structure And a second load measuring step of measuring the load on the base of the existing lower half structure later,
The on-site assembly process is
A third load measuring step of measuring a load on the pedestal of the lower half structure before connecting the pipe to the lower half structure;
A fourth load measuring step of measuring a load on the pedestal of the lower half structure after connecting the pipe to the lower half structure;
Amount of change from the load of the existing lower half structure measured in the first load measurement step to the load of the existing lower half structure measured in the second load measurement step and the third load measurement The pipe acting on the lower half structure so that the amount of change from the load of the lower half structure measured in the step to the load of the lower half structure measured in the fourth load measuring step is equal. And D. a load adjusting step of adjusting the load on the pedestal of the lower half structure by adjusting the reaction force of the pipe with the pipe reaction force adjusting mechanism.
A turbine installation method according to claim 7 or 8.