JP2873139B2 - Condenser construction method for nuclear power plant turbine building. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser construction method for installing a condenser in a turbine building of a nuclear power plant, and more particularly to a nuclear power plant which shortens a construction process and promotes labor saving at a building site. The present invention relates to a method for constructing a condenser in a turbine building of a power plant.

[0002]

2. Description of the Related Art A condenser installed in a turbine building of a nuclear power plant is a typical large-sized device among products constituting a nuclear power plant. In the conventional condenser construction method, after the turbine and generator pedestal (hereinafter referred to as TG pedestal) legs and beams are completed in the turbine building,
Hot well, lower body, upper body, which are parts of condenser
Each of the connecting cylinders is transported to a set place in a state of being divided into several blocks, and assembled (hereinafter, referred to as a first conventional technique).

In another conventional construction method, T
-When the G pedestal leg is completed, each of the hot well and the lower torso is divided into several blocks, carried into the set place, and assembled with the hot well and the lower torso in parallel with the construction of the TG pedestal beam and After the installation, the upper body divided into several blocks is carried in, and the upper body is assembled and installed (hereinafter, referred to as a second conventional technique).

Further, as described in JP-A-3-229904, after the TG pedestal legs and beams are completed, the upper body is divided into several blocks into a large block of a hot well and a lower body. Then, they are loaded and transported to a set place, and then the hot well and the large block of the lower body are installed, and the upper body is assembled and installed using a crane (hereinafter, referred to as a third conventional technique).

On the other hand, in the construction method for buildings other than condensers, in order to improve the setting procedure of large-scale equipment or fixed structures and to achieve early completion, the blocks are preceded by loading into the setting place and then loaded. Japanese Unexamined Patent Publication No.
As described in JP-A-270437, "Construction method of building floor frame installation module", JP-A-63-111040, "Construction method of nuclear power plant" and JP-A-61-53963, "Plant components" There is known a method of assembling and modularizing products such as equipment and piping to be carried in (hereinafter, referred to as a fourth conventional technology). In this conventional technique, a prefab module to be set is used as a concrete formwork, or a supporting steel frame of the module is used as a transportation frame.

Further, as a conventional method for assembling a tall large structure like a condenser, Japanese Patent Application Laid-Open No. 63-233170, "Elevated Water Tank Construction Method" and Japanese Patent Application Laid-Open No. 63-233171
Patent Publication "Elevated Water Tank Construction Method" and JP-A-57-1691
No. 77, “Assembling method of steel silo” (hereinafter referred to as “No. 5
Of the prior art).

[0007]

The social background in recent years, construction workers engaged in local construction work are less likely to gather, and at the same time, the quality of the workforce has been reduced, so that on-site work is It is necessary to simplify and reduce the amount of actual work. Also, in recent years, in the construction of a new nuclear power plant, it has been required to reduce the construction cost and shorten the construction period when constructing a new nuclear power plant.

In particular, since the condenser installed in the turbine building of a nuclear power plant is a large-sized device, it takes a great deal of time and man-hours to carry in and set it. An enormous amount of pipes, equipment, operation bases, etc. are installed, and the inside of the building is narrow, so it is necessary to carry them in and install them efficiently.

In the first and third prior arts, all the component blocks of the condenser are used, and in the second prior art, the upper body part blocks of the condenser are used for the TG pedestal leg and the T-piece. After the completion of the G pedestal beam, it was carried into the set place. For this reason, many setting operations (positioning operation, installation operation, welding operation, and the like) are performed after the members are carried in, so that the number of work steps on site is large. Further, the setting work of the upper body of the condenser can be performed only after the setting of the lower body of the condenser is completed.In particular, it takes a lot of time and man-hours to carry in and set the constituent members of the upper body. There was room for shortening and man-hour reduction. In the third conventional technique, TG
Since the large blocks were to be loaded after the pedestal was completed, they could only be loaded by roller pulling, requiring a lot of construction time for loading and setting. As described above, in the first to third prior arts, the period required for carrying in and setting the condenser becomes longer and T
-The construction period from the start of construction of the G pedestal to the completion of installation of the condenser was prolonged, which also affected the construction period of the nuclear power plant itself.

On the other hand, even if the above-mentioned fourth and fifth prior arts are applied to the construction method of the condenser, the condenser is loaded and installed in consideration of the TG pedestal construction procedure. Since the method of attaching the information is not disclosed, only the same improvement as that of the third conventional technique can be performed, and there is a similar problem.

A first object of the present invention is to make a condenser block to be carried in a large block and carry in and install the condenser while taking into account the construction procedure of the TG pedestal, so that the condenser is installed. It is an object of the present invention to provide a method for constructing a condenser in a turbine building of a nuclear power plant, which can shorten a period required for loading and setting.

A second object of the present invention is to provide a TG pedestal by enlarging a part of a condenser to be carried in and installing and installing the condenser in consideration of a construction procedure of the TG pedestal. It is an object of the present invention to provide a method for constructing a condenser in a nuclear power plant turbine building, which can shorten the construction period from the start of construction of the reactor to the completion of installation of the condenser.

[0013]

SUMMARY OF THE INVENTION In order to achieve the first and second objects, the present invention relates to a condenser construction method for installing a condenser in a turbine building of a nuclear power plant. The hot well, the lower body part, the upper body part, and the condenser large block that integrates the equipment, piping, and piping accessories that are installed inside each part of the condenser at a place other than the turbine building Assemble and weld to make a semi-finished product, construct turbine and generator pedestal legs in the turbine building, and use a large lift to set the condenser large block between the pedestal legs after the pedestal legs are completed. The present invention provides a method for constructing a condenser, wherein the condenser is directly carried into a place, and then a beam for a turbine / generator pedestal is constructed, and the condenser large block is set.

Further, in order to achieve the first and second objects, the present invention comprises a condenser main body in a condenser construction method for installing a condenser in a turbine building of a nuclear power plant. The first condenser large block integrating the hot well, the lower trunk part and the equipment, piping and piping accessories installed inside each of these condenser parts, and the upper trunk part and the upper trunk part The installed equipment, piping, and the second condenser large block that integrates the piping accessories are assembled and welded at locations other than the turbine building to produce semi-finished products. A pedestal leg is constructed, and after completion of the pedestal leg, the first and second condenser large blocks are directly carried into a set place between the pedestal legs using a large lifting machine.
A method for constructing a condenser, comprising: completing a beam of a generator pedestal; and setting the first and second condenser large blocks. In this case, after completion of the pedestal beam, the second condenser large block is lifted using the pedestal beam, and the first condenser large block is installed in this state, and then the second condenser large block is installed. The first and second condenser large blocks may be set by suspending the large condenser block and joining the second condenser large block to the first condenser large block. In addition, the second condenser large block is lifted using the temporary beam installed on the pedestal, and the first condenser large block is installed in this state, and thereafter, the second condenser large block is installed. The first and second condenser large blocks may be set by suspending the block and joining the second condenser large block to the first condenser large block.

Further, in order to achieve the above first and second objects, the present invention comprises a condenser main body in a condenser construction method for installing a condenser in a turbine building of a nuclear power plant. Equipment, piping, and piping accessories installed inside the hot well, lower body part, and each part of these condensers
A first condenser large block in which the components divided into four large modules are respectively integrated, and a second body in which the upper body part and the equipment, piping, and piping accessories installed inside the upper body part are integrated. The large condenser block is assembled and welded in places other than the turbine building to produce semi-finished products.The turbine and generator pedestal legs are constructed in the turbine building. The first and second condenser large blocks are directly carried into the set place between the pedestal legs by using, and then the beams of the turbine / generator pedestal are completed, and the first and second condenser large blocks are completed. A construction method of a condenser characterized by setting a block is provided.

[0016]

In the present invention constructed as described above, a single condenser large block or first and second condenser large blocks assembled at a place other than the turbine building are set using a large lifting machine. By carrying in the place, the number of carrying-in operations is reduced. In addition, since the loading is performed when the TG pedestal legs are completed, there is no beam that can obstruct the pedestal.
For this reason, it is possible to significantly reduce the period related to the loading operation. Further, since at least the upper body is loaded and set as a single module, the installation process required for assembling and setting the upper body is not required. In addition, by installing the instruments and pipes attached to the condenser in advance in the condenser large block, the installation steps for loading and setting these can be omitted.

Therefore, according to the present invention, the period required for carrying in and setting the condenser is shortened, and the construction period from the start of the construction of the TG pedestal to the completion of the installation of the condenser is shortened. It also allows the entire nuclear power plant process to be shortened.

In addition, since welding of the components of the upper and lower shells of the condenser and installation of the equipment and pipes inside the condenser are performed in a place other than the turbine building where the environment is better and production equipment is provided, Improvements in work accuracy and productivity are expected. In addition, the condenser can be manufactured irrespective of the construction and installation work process at the site. Further, work at heights due to the setting of the upper body of the condenser is greatly reduced, so that work safety is improved.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. First, a condenser construction method according to a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 2, reference numeral 1 denotes a turbine / generator pedestal constructed in a turbine building 28 (see FIG. 6), that is, a TG pedestal. This TG pedestal 1
The upper pedestal beam 5 on which the high-pressure turbine 2, the low-pressure turbine 3 and the generator 4 are mounted, the pedestal leg 6 as a lower support structure for supporting the upper pedestal beam 5, and the intermediate beams 7a and 7b are provided in the turbine building. A condenser 8 is formed integrally on the foundation board, and contains therein a condenser 8 for storing condensate from the high-pressure turbine 2, the low-pressure turbine 3 and the generator 4 and returning the remaining steam to water. I have. The upper pedestal beam 5 includes an upper horizontal beam 9a and an upper vertical beam 9b. The condenser 8 is installed in the following procedure according to the construction method of the present embodiment.

First, as shown in FIG. 3, a hot well 21, a lower body 22, an upper body 23, a feed water heater 24, a front water chamber 25, and a rear water chamber 26 (see FIG. 1) which constitute a condenser main body. ,
A large module (hereinafter, referred to as a condenser large block) 20 that integrates equipment, piping, etc. attached to other condensers is assembled in a factory, a local temporary factory, or a terrain area. Keep it as a finished product. On the other hand, turbine building 2
In FIG. 8, as shown in FIGS. 4 and 5, a base plate 29 (see FIG. 1) as a condenser setting place between the legs 6 and the intermediate beam 7 of the TG pedestal 1 and the pedestal legs 6 is constructed. After the completion of the pedestal legs 6 and the intermediate beams 7 and the foundation board 29, as shown in FIGS. 6 and 1, the condenser large block 20 is moved between the pedestal legs in the turbine building 28 using a large lifting machine 27. It is carried directly onto the base board 29 which is the setting place. After the loading, as the construction work, the upper beams 9a and 9b (upper pedestal 5) of the TG pedestal are constructed as shown in FIGS. 7 and 8, and then the condenser large block 20 is set as the machine side installation work. I do. Condenser large block 20
The setting operations include fixing the condenser large block 20 with anchor bolts, positioning and connecting to the external piping 30 and the like such as equipment and piping set for the condenser. Thereby, the setting of the condenser 8 is completed.

Finally, the state shown in FIG. 2 is obtained by installing the high-pressure turbine 2, the low-pressure turbine 3 and the generator 4 on the upper beams 9a and 9b (upper pedestal beam 5).

Next, the effect of this embodiment will be described with reference to FIG. FIG. 9 is a process diagram showing a comparison between a conventional method for constructing a general condenser and a conventional example. In the figure,
The old method 1 corresponds to the second conventional technique described above, and the old method 2 corresponds to the third conventional technique described in Japanese Patent Application Laid-Open No. 3-229904.

As shown in FIG. 9, in the construction method according to the second prior art (old construction method 1), the hot well 21 and the lower body 22 are carried in when the TG pedestal leg 6 is completed. At this time, the loading is performed by the hot well 21 and the lower body 2
Split each of 2 into several blocks,
It was carried out by hanging each block with a crane. At that time, the upper body 23 was not carried in, and the upper body 23 was carried in after the installation work of the lower body 22 was completed. The loading at this time is also performed in the form of parts of the upper body 23. In the method of installing the upper body 23, an outer frame panel, which is a part of the upper body, is carried onto the lower body 22 and assembly work and installation work of equipment and piping are performed there.

In the third prior art construction method (old construction method 2), the TG pedestal leg 6 and the beams 7, 9a, 9b
Was completed, the large block of the hot well 21 and the lower trunk 22 (the lower trunk large block) and the lower trunk 23 were carried in. At this time, the carry-in was performed by placing the upper trunk part on the lower trunk large block and pulling the roller. After carrying in, the lower torso large block was installed, and then
As in the prior art, assembling work of the upper body 23 and equipment,
Piping installation work had been performed.

As described above, in the conventional construction method, many setting operations (positioning operation, installation operation, welding operation, etc.)
Is performed after the members are carried in, so that the number of man-hours on site is large. In addition, the setting work of the upper body of the condenser can be performed only after the setting of the lower body of the condenser is completed.In particular, it takes a lot of time and man-hours to carry in and set the constituent members of the upper body. There was room for shortening and man-hour reduction. In the third prior art (old method 2), since the large block after the completion of the TG pedestal is carried in, the upper beam is in the way. It took a lot of construction time. As described above, in the prior art, the period for carrying in and installing the condenser is extended as A1 and A2, and the period from the start of the construction of the TG pedestal to the completion of the installation of the condenser is as large as B1 and B2. It took a construction period.

On the other hand, in this embodiment, the hot well 21, the lower body 22, the upper body 23 and the like assembled in the condenser large block 20 at the factory, the local temporary factory or the terrain area are connected to the large lifting machine 27. The number of times of carrying-in work is reduced by using and carrying in simultaneously. In addition, since the loading is performed when the TG pedestal leg 6 is completed,
Since there is no upper beam to be in the way, it can be easily carried directly to the set place by the large lifting machine 27. For this reason, it is possible to significantly reduce the period related to the loading operation. In addition, lower torso 2
Since the upper body 23 and the upper body 23 are loaded and set as a single module, the installation process required for assembling and setting the upper body 23 becomes unnecessary. In addition, by installing the instruments and pipes attached to the condenser in the condenser large block 20 in advance, it is possible to omit the installation steps related to the loading and setting.

Therefore, according to the present embodiment, as is apparent from FIG. 9, the period required for carrying in and setting the condenser is shortened as indicated by A3, and the period required for the construction of the TG pedestal is restored. The construction period until the installation of the water dispenser is completed is shortened to B3. It also allows the entire nuclear power plant process to be shortened.

Further, in the prior art, the welding of the upper and lower shells of the condenser and the condenser, which were performed at the installation site inside the turbine building of the nuclear power plant, where the working environment is not so good because of poor scaffolding and insufficient lighting. Since the installation work of the internal equipment and piping is performed in a factory other than the turbine building, which has a better environment and is equipped with a production facility, or a temporary temporary factory or a terrain area, an improvement in work accuracy and an improvement in productivity are expected. Also,
Condenser can be manufactured regardless of construction and installation work process at the site. Further, work at heights due to the setting of the upper body of the condenser is greatly reduced, so that work safety is improved.

A construction method of a condenser according to a second embodiment of the present invention will be described with reference to FIGS. In the first embodiment, one of the features is that the installation work is performed by effectively utilizing the large-sized hoisting machine 27. However, the size of the module (large block) that can be suspended is limited by the performance of the hoisting machine. Will be done. If the capacity of the lifting machine is sufficient to suspend all the products constituting the condenser body at one time, the above first embodiment is most preferable. I have to adopt. The present embodiment provides such an alternative method.

That is, in the present embodiment, as shown in FIG. 10, the hot well 21, the lower trunk portion 22, the front water chamber 25, the rear water chamber 26 and the respective parts of the condenser constituting the condenser main body. A first condenser large block 40A that integrates equipment, piping, and piping accessories to be installed therein;
3. Assembling the feedwater heater 24 and the second condenser large block 40B, which integrates equipment, piping, and piping accessories installed inside the upper trunk portion, at a factory or a local temporary factory, or a terrain area, respectively.・ Semi-finished products are welded, and these are set at the locations between the pedestal legs in the turbine building 28 using the large lifting machine 27 when the TG pedestal legs 6 are completed as in the first embodiment. Is directly carried onto the base board 29. After the loading, the upper beams 9a and 9b of the TG pedestal are constructed as a construction work, and when the TG pedestal is completed, directly on the TG pedestal beam 9b or FIG.
The temporary beam 4 installed on the TG pedestal as shown in FIG.
1 using the second condenser large block 4 in the upper body 23
0B is lifted, and the settings such as positioning of the first condenser large block 40A in the lower body 22 and installation with anchor bolts are performed. After the completion of this setting, the second condenser large block 40B is suspended, and the second condenser large block 40B and the first condenser large block 40A are welded and connected.

Also in this embodiment, the first and second condenser large blocks 40A and 40B assembled in the factory, the temporary temporary factory, or the terrain area are carried in using the large hoist 27. Thus, the number of times of carrying-in work is reduced, and the carrying-in work is performed at the time when the TG pedestal leg 6 is completed. Therefore, the carrying-in work can be easily carried into the set place by the large-sized hoisting machine 27. The period can be shortened. Further, the upper body 23 is connected to the single module 4.
Since the loading and setting are performed as 0B, the installation process for assembling the upper body 23 at the installation location is unnecessary. In addition, by installing the instruments and pipes attached to the condenser in advance in the module, the installation process for carrying in and setting these can be omitted.

Therefore, according to this embodiment, as shown in FIG. 9, the period required for carrying in and setting the condenser is A4.
And the construction period from the start of the construction of the TG pedestal to the completion of installation of the condenser is shortened to B4. It also allows the entire nuclear power plant process to be shortened. Further, other effects of the first embodiment can be obtained similarly.

A modification of the second embodiment will be described with reference to FIG. In the second embodiment, the condenser is divided into two condenser large blocks 40A and 40B. However, in the present embodiment, the lower trunk part, which is heavier than the upper trunk part, is further divided into the condenser large blocks 40A1, 40A1. 40A2 divided into two. In this case, it is preferable that the position to be divided into two is divided by the hot well 21 and the lower trunk 22. In some cases, as shown by the imaginary line, these blocks may be further divided into two to make a total of four blocks. Thus, even when the lower trunk portion of the condenser is further divided, the construction procedure is substantially the same as that of the second embodiment except that the joining step of each block is added, and almost the same effect is obtained. can get.

[0035]

According to the present invention, the condenser large block is set to T
-Since the G pedestal legs are carried in at the time of completion, the period required for carrying in and setting the condenser is shortened, and the T-
The construction period from the start of construction of the G pedestal to the completion of installation of the condenser will be shortened. It also allows the entire nuclear power plant process to be shortened.

According to the present invention, the welding of the upper and lower shells of the condenser and the installation of the equipment and pipes inside the condenser are performed in a place other than the turbine building where the environment is better and the production facilities are complete. Therefore, improvement of work accuracy and improvement of productivity are expected. In addition, the condenser can be manufactured irrespective of the construction and installation work process at the site. Further, work at heights due to the setting of the upper body of the condenser is greatly reduced, so that work safety is improved.

[Brief description of the drawings]

FIG. 1 is a view showing a state of carrying in a condenser large block in a construction method according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view showing the appearance of a TG pedestal and a condenser installed therein according to the construction method of the present invention.

FIG. 3 is a schematic perspective view showing an appearance of a condenser large block in the construction method according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a T-structure in the construction method according to the first embodiment of the present invention;
It is a figure showing the state where the G pedestal leg was completed.

FIG. 5 is a schematic perspective view showing the entirety of the TG pedestal leg shown in FIG. 4;

FIG. 6 is a diagram showing a state in which the condenser large block shown in FIG. 3 is suspended using a large lifting machine.

FIG. 7 is a diagram showing a setting state of a condenser large block in the construction method according to the first embodiment of the present invention.

FIG. 8 is a schematic perspective view showing the entire TG pedestal after a condenser large block is set in the construction method according to the first embodiment of the present invention.

FIG. 9 is a process chart showing a comparison between a process according to the conventional method and a process according to the construction method of the present invention.

FIG. 10 is a schematic perspective view showing the appearance of first and second condenser large blocks in a construction method according to a second embodiment of the present invention.

FIG. 11 is a view showing a setting state of a condenser large block in the construction method according to the second embodiment of the present invention.

FIG. 12 is a schematic perspective view showing an appearance of first and second condenser large blocks in a construction method according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 TG pedestal 6 Pedestal leg 8 Condenser 9a, 9b Upper beam of pedestal 20 Condenser large block 21 Hot well 22 Lower body 23 Upper body 24 Feed water heater 27 Large lifting machine 28 Turbine building 29 Foundation board (setting place 40A 1st condenser large block 40B 2nd condenser large block 40A1, 40A2 1st condenser large block

Continuing on the front page (72) Inventor Kaneo Goto 3-1-1 Sachimachi, Hitachi-shi, Ibaraki Hitachi, Ltd. Hitachi Plant (72) Inventor Keiya Sato 1-1-14 Uchikanda, Chiyoda-ku, Tokyo JP-A-4-191916 (JP, A) JP-A-57-119113 (JP, A) JP-A-3-229904 (JP, A) JP-A-2-277904 (JP, A) JP-A-61-160504 (JP, A) JP-A-60-108687 (JP, A) Koji Fujimoto et al., “Special Issue on Recent Nuclear Power Generation Technology New Technology for Nuclear Plant Construction and Construction Management And Achievements ”, Hitachi Review, Vol. 70, No. 4, p. 371-378 (1988) (58) Fields investigated (Int. Cl. ⁶ , DB name) G21C 13/00 E04H 5/02 E04H 7/00 F01K 13/00 G21D 1/02 JICST file (JOIS)

Claims (5)

(57) [Claims] 1. A condenser construction method for installing a condenser in a turbine building of a nuclear power plant, comprising: a hot well, a lower body part, an upper body part, and each part of the condenser constituting a condenser body. Condenser large block that integrates equipment, piping, and piping accessories installed inside the building is assembled and welded in a place other than the turbine building to make it a semi-finished product, and in the turbine building, the turbine and generator pedestal After the pedestal legs were completed, the large condenser was used to directly carry the condenser large block into the set place between the pedestal legs.After that, the turbine / generator pedestal beams were constructed, and the Condenser construction method characterized by setting a large block. 2. A condenser construction method for installing a condenser in a turbine building of a nuclear power plant, comprising: installing a hot well, a lower body part constituting a condenser body, and each of these condenser parts. Equipment, pipes, the first condenser large block integrating the pipe accessories, and the upper body part and the equipment, piping installed inside the upper body part
The second condenser large block with integrated pipe accessories is assembled and welded at a place other than the turbine building to form a semi-finished product. At the turbine building, the turbine and generator pedestal legs are constructed. After the completion of the pedestal legs, the first and second condenser large blocks are directly carried into the set place between the pedestal legs using a large lifting machine, and thereafter, the beam of the turbine / generator pedestal is completed, and the 1
And setting a second condenser large block. 3. The condenser construction method according to claim 2, wherein after the pedestal beam is completed, the second condenser large block is lifted by using the pedestal beam, and in this state, the first condenser is lifted. The large condenser block is installed, then the second condenser large block is suspended, and the first and second condenser large blocks are joined to the first condenser large block. 2. A method for constructing a condenser, comprising setting a condenser large block. 4. The method for constructing a condenser according to claim 2, wherein the second beam is provided by using a temporary beam installed on the pedestal.
, The first condenser large block is installed in this state, and then the second condenser large block is suspended, and the second condenser large block is lifted. A method for constructing a condenser, wherein the first and second condenser large blocks are set by being joined to the first condenser large block. 5. A method of constructing a condenser for installing a condenser in a turbine building of a nuclear power plant, comprising: installing a hot well and a lower body part constituting a condenser body and inside each part of these condensers. Equipment, piping, pipe attachment parts divided into 1 to 4 large modules, the first condenser large block integrated respectively, and the upper body part and equipment installed inside the upper body part, The second condenser large block with integrated piping and piping accessories is assembled and welded at a location other than the turbine building to make it a semi-finished product. In the turbine building, the turbine and generator pedestal legs are constructed. After the completion of the pedestal legs, the first and second condenser large blocks are directly carried into a set place between the pedestal legs using a large lifting machine, and then the beams of the turbine / generator pedestal are completed. And, construction method of the condenser, characterized in that for setting the first and second condenser large block.