JPH1184049A - Turbine building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationalize an operation and to secure safety by assembling a trestle at an area to a building wall while straddling over the shelter body of a turbine entrance steam middle stop valve and constituting a flat middle floor. SOLUTION: A middle trestle 8 of a solid framework is raised from an operation floor directly above, for example, a shelter body 7a of a turbine entrance steam middle stop valve at both sides of the center of low-pressure turbines 3a-3c, thus constituting a middle floor 8a with a flat top part. Openings 8a-8d where the middle stop valve passes when the turbine entrance steam middle stop valve is lifted directly above by a ceiling crane 14 are provided on the middle floor 8a. A monorail 11, a hoist 12, and a light, and a ventilation duct are installed on the ceiling of the inner space of the trestle 8. The structure of the trestle 8 is made of H steel, box-type steel, or steel pipe, which should have a strength for withstanding the load of parts and a rack 9 and the like being placed above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine building in which a cradle on which components can be temporarily placed by a crane is installed on a floor near an operation floor during periodic inspection of a turbine of a nuclear power plant.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG.

[0003] From the high pressure turbine 2 to the low pressure turbines 3a, 3b,
The piping 5 at the steam inlet to 3c is horizontal from the bottom of the operation floor to the floor at the opening of the operation floor, is connected horizontally from the left and right at the center of the turbine body, and the intermediate stop valve 6 is disposed at the floor opening. This portion is surrounded and shielded by steel plate shields 7a, 7b and 7c so that the dose equivalent from the passage, the steam inlet pipe and the intermediate stop valve to the passage is reduced.

The intermediate stop valve 6 at the steam inlet is a butterfly valve, and the shields 7a, 7b, 7c protrude from the floor 1 and have a height of about 2.5 m. Power plant turbines are required to be shut down and inspected and inspected at intervals of approximately one year, with equipment open. The turbine generator main body and main steam valve are disassembled and the parts can be deployed on the operating floor. A large space is secured around the installation floor of the turbine generator so that large heavy parts can be lifted and transported. An overhead crane 14 is provided.

At this time, it is preferable to use a flat space as close as possible to the equipment for good workability, but this shielding body 7 is provided on both sides of the center of the low-pressure turbine main bodies 3a, 3b, 3c.
Since a, 7b, and 7c protrude from the floor surface, the width of the building generator wall 1a in the direction perpendicular to the axis of the turbine generator is narrowed, and a wide space is required for placing a wide part in a concave planar shape. . In particular, among the disassembled parts, the turbine diaphragm is a disassembly sequence that is lifted by an overhead crane after the other parts from the internal structure of the turbine.

[0006] In addition, a semi-doughnut type having a different diameter for each paragraph has a large number of members and a large number of reciprocating movements of the overhead crane. If it is deployed in the immediate vicinity of the turbine body, the range of movement of the suspended load is narrowed, which is preferable from the viewpoint of safety during work around the turbine.

In the prior art shown in FIG. 2, in order to widely deploy a turbine diaphragm having a larger diameter near this shielding frame, the width of the overhead crane and the width up to the building wall must be increased. As a result, the turbine building grows larger. Transport to a location away from the turbine generator axial direction,
It is deployed on a dedicated rack placed directly on the operating floor. Since the disassembly procedure is slowed down, a large-sized component such as a casing or a rotor must be taken care of while moving or passing while it is moving. Around the shield frame near the low-pressure turbine, a rack for small items is divided and deployed in the turbine diaphragm due to the plane shape of the floor surface.

[0008]

SUMMARY OF THE INVENTION When temporarily deploying on the operating floor of a turbine building, a wide floor on which components having a slow disassembly procedure and a large number of members can be placed in the immediate vicinity of the low-pressure turbine or the high-pressure turbine. In particular, since the shielding body protrudes from the operating floor surface near the shielding body of the inlet steam intermediate stop valve at the center of the low-pressure turbine, the planar shape is concave, and a wide part cannot be provided. To be able to temporarily place a rack that can lean against a set of diaphragms for one turbine that you want to deploy in the immediate vicinity of the turbine from the point of view of convenience.

At this time, the disassembling procedure is slow, and the suspended load is frequently moved by an overhead crane. Another object of the present invention is to make the space around the turbine building wider without increasing the size of the turbine building whose dimensions are determined by the arrangement of equipment below the operating floor and without increasing the length of the overhead crane.

[0010]

Each of the above-mentioned objects is attained by the following.

1) In order to three-dimensionally use the space around the shielding structure of the turbine inlet steam intermediate stop valve protruding from the operating floor surface, a frame is provided between the shielding structure and the building wall, and a flat intermediate structure is provided. Make up the floor. Alternatively, an intermediate floor is installed as a stand integrating the shielding frame and the structure.

2) A rack for temporarily suspending a steam turbine diaphragm among the disassembled parts is temporarily placed on the intermediate floor so that parts having a slow disassembly procedure and a large number of parts can be unfolded by an overhead crane.

3) A monorail, hoist and lighting are provided on the ceiling of the gantry so that relatively small parts can be temporarily stored in the space below the gantry constituting the intermediate floor, and the parts are transported and deployed.

4) A high-pressure turbine diaphragm is mounted on a gantry in the immediate vicinity of the high-pressure turbine to form a flat intermediate floor, and a monorail, a hoist, and a light are provided on the ceiling of the gantry to carry and unfold parts.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a bird's-eye view of a turbine generator installation floor showing the arrangement of a gantry according to the present invention. Low pressure turbine 3
On the both sides of the central portion of the a, 3b, 3c, a three-dimensional frame-based intermediate base 8 is set up immediately above the turbine inlet steam intermediate stop valve shields 7a, 7b, 7c from the operation floor, and a flat intermediate floor 8a at the top.
Is configured. The intermediate floor is provided with openings 8b, 8c, 8d through which the intermediate stop valve 6 of the stop valve passes when the intermediate stop valve 6 for the steam at the turbine inlet is lifted directly above by the overhead crane. A monorail 11 and a hoist 12 are installed on the ceiling so that small parts of the disassembled parts can be temporarily placed in the internal space of the three-dimensional frame 8. Lighting and ventilation ducts will also be installed.

The structure of the gantry is made of H steel, square steel or steel pipe, and has sufficient strength to support the load of the components mounted thereon and the rack 9 and the like. The gantry 8 is a frame that is easy to assemble. It is assembled at the beginning of the periodic inspection. At the end, the pillars and beams are removed and stored in the corner of the operating floor so that the overall appearance of the turbine and generator is not damaged. I do. In the case of a detachable mount, it can be taken into the adjacent turbine building and used. Generally, regular inspection
Since it is carried out at a different time, it can be shared and becomes economical.

[0018] Shielding body 4 of the turbine intermediate steam stop valve
Is made of a thick steel plate of 200 to 300 mm and has a box-shaped enclosure structure. In this case, there are advantages that the structural members can be saved, and the assembling and removing operations can be omitted.

[0019]

According to the present invention, the following effects can be obtained.
It can be streamlined by unfolding work, which is advantageous in reducing the moving range of parts during work and safety.

1. Even if the operating floor surface of the turbine building is the same, the installation of the intermediate floor stand makes both the upper and lower spaces of this stand effective, so that the parts deployment area of this intermediate floor can be used as much as possible, Large parts can be deployed on this intermediate floor.

2. Of the turbine disassembly parts, the diaphragm is the slowest disassembly procedure, so it is the nearest deployment place, so that it does not pass through the place where other parts are placed, and it is safe to work on the surrounding floor The nature increases. In addition, since a wide floor surface can be formed, a set of one turbine having a different diameter for one turbine can be collectively racked.

3. A large number of turbine disassembly parts can be deployed on the operation floor of the turbine building closest to the installation location, and the crane transportation range is narrower than before, so that the efficiency of the entire disassembly operation is improved.

[Brief description of the drawings]

FIG. 1 is an overhead view of an operating floor of a turbine building showing an embodiment of the present invention.

FIG. 2 is an overhead view of a conventional operation floor of a turbine building.

[Explanation of symbols]

1 ... floor surface, 1a ... turbine building wall, 2 ... high-pressure turbine,
2a: high pressure turbine shield, 3a, 3b, 3c: low pressure turbine, 4: generator, 5: pipe, 6: intermediate stop valve, 7a, 7
b, 7c: shielding body, 8: stand, 8a: intermediate floor, 8b, 8
c, 8d: opening, 9: turbine diaphragm rack, 1
0: Intermediate railing, 11: Monorail, 12: Hoist, 13: Crane rail, 14: Overhead crane.

Claims (6)

[Claims] The present invention relates to a boiling water nuclear power plant, which is located above the operating floor of a turbine building and straddles a steam inlet pipe at a floor opening and a shielding body surrounding an intermediate stop valve on both sides of a low-pressure turbine. A turbine building equipped with a steel gantry that is installed on the operating floor and forms a flat intermediate floor between the turbine building and the wall. 2. The turbine building according to claim 1, wherein the steel gantry has a three-dimensional frame structure, forms an inner lower space of the gantry, and has a gantry provided with a monorail, a hoist, and lighting on a ceiling portion. . 3. A steel gantry according to claim 1, wherein a steel gantry constituting a floor surface having an opening through which the valve body can be lifted when the valve body is integrally lifted is installed immediately above the turbine inlet steam stop valve. Characteristic turbine building. 4. The steel frame according to claim 1 is integrally formed with the shield frame surrounding the steam inlet pipe and the intermediate stop valve, and the steel frame frame having the structure according to claim 2 and 3 is installed. A turbine building characterized by: 5. A fixed part that can be used as a temporary storage place for carrying out and moving parts by a crane for periodic inspection of turbines and performing inspection and repair on the intermediate floor surface provided by the steel base of claim 1 and 4. A turbine building characterized by an installation method of a stand or a stand that is temporarily installed and used only during the period of the periodic inspection, and that it is placed close to the turbine. 6. A steel gantry constituting an intermediate floor has a three-dimensional frame structure right and left of a high-pressure turbine directly connected to a low-pressure turbine, and a lower inside space of the gantry is provided. A monorail, a hoist, and a lighting are provided on a ceiling portion. A turbine building, which is equipped with a stand on which high-pressure turbine disassembled parts can be deployed.