JPS6166806A - Turbine frame - Google Patents

Abstract

PURPOSE:To reduce load produced due to an earthquake whereby improve structural strength with ease while shorten a process of construction by providing upper and lower steel-made frames constituting a turbine frame, and arranging an earthquake insulator device profitably employing frictional force between both of said frames. CONSTITUTION:A turbine frame consists of a upper frame 1 and a lower frame 2, and the upper frame 1 has a reinforcing steel plate 9, stell bodies 12, 13 and a grout 15, etc. In the above arrangement, the upper and lower frames 1, 2 are respectively made of steel, and an earthquake insulator device is provided therebetween. The earthquake insulator device is constructed for example by fixing integrally a upper friction plate 8 and a lower friction plate 10 with use of a bolt 11. Hereby, the turbine frame is made endurable in strength against earthquake load within a prescribed limit by making use of frictional frame produced between the upper and lower friction plates 8, 10, while, for excessive earthquake load, the bolt 11 is ruptured to allow the upper and lower friction plates 8, 10 to slide transversely. Thus, since friction absorbs earthquake energy, the structure can be simplified.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to main turbines in thermal power plants, nuclear power plants, etc.
The present invention also relates to a frame structure with high earthquake resistance for installing a turbine generator.

[Background of the invention]

Regarding the prior art, the third and fourth causes are as follows. Figure 5.

This will be explained based on FIG.

In the figure, l is a turbine pedestal, 2 is a high-pressure turbine, and 3 is a high-pressure turbine.
4 is a low-pressure turbine, 4 is a turbine generator, and 5 is a turbine building floor serving as a storage facility.

Figure 3 is a three-dimensional view of the turbine generator area inside the turbine building, Figure 4 is a soil surface diagram of the second floor of the turbine building where the turbine and turbine generator m are installed, and Figure 5 is a three-dimensional view of the turbine generator area in the turbine building. It is a longitudinal cross-sectional view (AA cross section) in a position part.

Conventionally, a high-pressure turbine 2, a low-pressure turbine 3, and a turbine generator 4 are installed on a rigid turbine pedestal l.

The high-pressure turbine 2, low-pressure turbine 3, and turbine generator 4 are high-speed rotating bodies, and each of them generates a large amount of vibration. The conventional turbine mount l on which these equipment parts were installed was separated from the turbine building floor 5, and was designed to prevent cranking of the building concrete structure due to rotational vibration propagation to the building side. Therefore, in addition to forming a single base structure with the building side, the turbine mount l is a supporting part at the foundation of the turbine building. It is a self-supporting structure that does not have any money.

Will the turbine E1m be made more compact in future plants?
In order to achieve this, there has been a trend to increase the number of heaters running on the turbine pedestal from two to four, and the height of the turbine pedestal itself has become approximately 2 m higher than before, resulting in the displacement of the upper part of the pedestal and the relative distance between the turbine building and the turbine pedestal. Displacement increases. Therefore,
As shown in the example shown in FIG. 4, the design of the cross-aligned pipe connecting the turbine/moisture separator is difficult.

On the other hand, in recent years, due to the difficulty in locating power plants and the tightening of seismic regulations, the design ground return movement is shifting to a larger one than the conventional plan).
seismic responses are increasing, and support structure solutions are urgently needed.

The fourth example shows the results obtained by deformation mode analysis on the turbine pedestal l during an earthquake.

As shown in the figure, the relative displacement between the turbine building and the turbine mount is large at the upper position of the turbine mount.

Conventionally, the turbine frame has a reinforced concrete structure, but the amount of reinforcing steel is kept close to the amount required to cope with an increase in load. Therefore, in recent years, there has been a tendency for the construction process to increase as the number of reinforcing bars increases.

[Purpose of the invention]

An object of the present invention is to solve the problems in the prior art described above.
By installing seismic isolation rubber between the upper and lower mounts and fixing them all together, we provide a steel turbine mount that uses frictional force to reduce seismic force and shorten the construction process. It is something to do.

[Summary of the invention]

The main point of the present invention is to install a seismic damping device made of seismic isolation rubber between the upper and lower frames of the conventional reinforced concrete turbine frame, and to fix them together. This method is close to the limit, making it possible to shorten the construction process due to an increase in the amount of reinforcing bars, and making it possible to create an economical 1% earthquake-resistant structure.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 8 is the upper friction plate, 1o is the lower friction plate, ll
are the upper friction plate 8 and the lower friction plate 1 (1 bolts for fixing them together, 12 and 13 are individual square steel products, 14 is a grout hole for grout injection, 15 is a grout, 9 is a square steel product) Shows the reinforced steel plate of the object.

FIG. 1 shows an embodiment of the present invention having a seismic isolation rubber friction plate between the upper and lower mounts, and FIG. 2 shows an embodiment of the friction plate and bolt connection method. The upper frame can also be made of a combination of multiple steel products, and the grout hole 14
Although it has a structure in which grout 15i is injected, each square steel product is composed of a steel plate 9 that reinforces the steel product.

Since the present invention is configured as described above, the structure is such that between the upper frame and the lower frame, the structure is strong enough to withstand earthquake loads within a certain limit due to frictional force, and the structure is strong enough to withstand earthquake loads that are within a certain limit. The bolt breaks and slides because it exceeds the frictional force. Therefore, in this structure, since seismic energy is absorbed by friction, it is possible to have a simple structure without increasing the total plate thickness. It is possible to change the material of the material, and the construction process can be shortened because the steel product is prefabricated at the factory and only needs to be bolted together on site.

Furthermore, in the present invention, the loudness is injected into the upper pedestal, which increases the rigidity of the turbine pedestal and therefore reduces the amount of deformation of the turbine pedestal, which reduces the amount of deformation that occurs between the turbine pedestal and the turbine building. Since the relative displacement is reduced, it has the effect of facilitating the design of the cross-around pipe 7, etc. that spans the fI between the turbine and the building, including the support design.

〔Effect of the invention〕

Since the present invention is configured and operates as described above, it can achieve the following effects.

(1) By using a turbine mount equipped with a vibration damping device,
Earthquake loads are reduced, making it easier to improve structural strength.

(2) By prefabricating steel products at a factory,
Since the structure only needs to be bolted together on-site,
The construction process can be shortened.

(3) Two groups in the preparation) 1- By injecting, the rigidity increases, creating a highly earthquake-resistant turbine frame and reducing relative displacement, so design piping connected to turbines, generators, etc. becomes easier.

[Brief explanation of the drawing]

The first figure is a sectional view of a turbine mount showing an embodiment of the present invention.
FIG. 2 is a schematic diagram of the method of combining friction plates according to the present invention, and FIG. 3 is a three-dimensional diagram of a conventional turbine generator IE@.
Figure 4 is a plan view of the turbine building, Figure 5 is A-A in Figure 4.
The IFr plane view and FIG. 6 are explanatory diagrams of vibration modes of the turbine mount based on eigenvalue analysis.

Claims (1)

[Claims] 1. In a turbine frame consisting of an upper frame and a lower frame, the upper frame and the lower frame are made of steel, a damping device is inserted between the two, and bolts are used to connect the two together to reduce frictional force. A turbine mount on which a turbine and a turbine generator are installed, which reduces seismic loads by using it, and also shortens the construction process by making it made of steel.