JPH0652050B2 - Integral Sol Plate for Steam Turbine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sole plate provided to support the weight of a steam turbine when it is installed.

[Prior art]

The steam turbine is driven by high-temperature high-pressure steam, and its rotating body obtains a rotating force by the steam force ejected from a nozzle of a stationary body.

In order to make effective use of this steam power, it is necessary to minimize the amount of steam that leaks from the gaps other than the nozzle section. However, this gap has an extremely small value of about 0.5 mm.

In order to obtain these gaps precisely, it is necessary to install and fix the stationary body extremely accurately.

A normal steam turbine is a reinforced concrete turbine-generator mount (hereinafter referred to as TG) that is a dedicated foundation together with a generator.
It is installed on the sole plate that is installed and fixed on the upper surface of the frame.

This sole plate not only supports the entire weight of the steam turbine, but also serves as the base of the stationary body, and it is necessary to accurately set the level, but it is difficult to set if the sole plate itself bends. Therefore, the length is also limited, and it is common to arrange a plurality of divided sole plates side by side and install the steam turbine on the sole plates.

A rectangular parallelepiped grout pad that can support the weight of the steam turbine is made between the bottom surface of the sole plate and the T-G mount, and the level of the sole plate is adjusted by adjusting the height of the grout pad. In addition to leveling the sole plates, leveling between the sole plates is also necessary, and it was necessary to anticipate a considerable period of time for the sole plate setting work.

The technology concerning the installation and fixing of the sole plate is described in, for example, an introductory course of the March 1980 issue of "Thermal Nuclear Power Generation" published by The Institute of Thermal Power Nuclear Power Generation.

Next, referring to FIGS. 7 to 12 in sequence, a conventional technique relating to installation of a steam turbine using a sole plate will be described.

FIG. 7 is a plan layout view of the steam turbine sole plates 8 and 8 ', and FIG. 8 is a sectional view taken along line VIII-VIII thereof.

FIG. 9 is a side view showing a state in which a steam turbine is installed on the sole plates 8 and 8 ', and FIG. 10 is a front view of the same.
FIG. 11 is a plan view seen in the direction of arrow D in FIG.

As shown in FIG. 7, the sole plates 8 and 8 ′ are installed and fixed on the TG mount 7. And since its size is adapted to the shape of the parts to be installed above, it is 8 or 8 '.
It is different like this. After setting, the sole plates 8, 8'are embedded in concrete around them and are fixed so that they do not move during the operation of the steam turbine.

The steam turbine has a low pressure casing 1 and a high pressure casing 2
(See Fig. 9) and each casing is divided into upper and lower parts by the horizontal joint surface 4 and bolted, making it easy to disassemble and inspect the turbine rotor, nozzle diaphragm, etc. built inside. It is configured like.

On the front side of the high-pressure casing 2, a bearing that supports one end of the turbine rotor and a front bearing box 3 that incorporates a control mechanism for controlling the steam turbine are installed (9th embodiment).
Figure). The front end of the high-pressure casing 2 is supported by the supporting portion 15 of the front bearing housing 3, and the rear end is supported by bolting with a vertical flange 5 that is formed between the front-end bearing housing 3 and the low-pressure casing 1.

The low-pressure casing 1 is connected to a condenser (not shown) for returning steam that has worked in the steam turbine to water.
-It extends downward in the opening of the G mount 7. (9th
It is indicated by a broken line in the figure. The low-pressure casing 1 has legs 6 around the lower half, and the legs 6 are placed on a sole plate 8 installed on a T-G mount 7 to support the entire weight.

Sole plates 8, 8'for installing steam turbines
Is fixed under the legs 6 of the low-pressure casing 1 and under the front bearing housing 3.

The sole plates 8 and 8'need to be precisely level in order to properly install the low pressure casing 1 and the front bearing housing 3 of the steam turbine.

First example of installing and fixing the sole plate of the low-voltage casing leg
It is shown in Figs.

The upper end of the T-G pedestal 7 is slightly suspended to produce good quality concrete, and the sole plate 8 is fixed onto the concrete with grout pins 17. The grout pin 17 is of a screw type so that the height thereof can be adjusted, and thereby the approximate level of the sole plate 8 is set. Also, T-G
A foundation bolt 18 for holding the sole plate 8 and the legs 6 of the low-pressure casing 1 is embedded in the gantry 7 in advance at an appropriate position, and the foundation bolt 18 and the grout pin 1 are attached.
The sole plate 8 is temporarily fixed by 7 and 7. afterwards,
A mold is formed between the surface of the T-G mount 7 and the sole plate 8, and grout material is poured into the mold to form a rectangular parallelepiped pad 9 (see FIG. 13). After the pad 9 is hardened, the sole plate 8 is lifted and the grout pin 17 is slightly screwed to make it short so that the grout pin 17 does not support the weight.

The level adjustment of the sole plate 8 is performed by inserting a shim 16 between the pad 9 and the pad 9 or scraping the pad 9 with a file or the like. For this reason, the pad 9 is provided in order to facilitate its production and level adjustment work.
Generally, it is constructed in a small size of 100 to 200 mm width and is installed at intervals.

Further, the pad 9 is made to have a strength enough to support the entire weight by itself. Sole plate 8,
The concrete to be placed around the sole plate and between the pads 9 after the entire level adjustment of 8'is completed,
By fixing the sole plate 8 and embedding the grout pin 17, the movement of the sole plate 8 is further eliminated.

By accurately installing and fixing the sole plates 8 and 8'in this way, when the front bearing box 3 and the low-pressure casing 1 are installed thereon, it is possible to naturally secure these levels of accuracy. A certain construction period is also necessary for the work.

Since high temperature steam flows into the steam turbine to cause thermal expansion, fixed points 10 and 11 are provided in the axial direction and the axis-perpendicular direction, respectively (see FIGS. 9 and 10). It is designed to expand and contract from the base point.

Along with this, the upper surfaces of the sole plates 8 and 8'are machined smoothly so that the sliding of thermal expansion is smooth, and the legs 6 of the low pressure casing 1 and the front bearing box 3 are attached to the sole plates 8 and 8 '. A groove is provided on the surface in contact with 8 ′ so that grease can be injected and lubricated.

The structure of the fixing point is, for example, as shown in FIG. 8, formed by forming grooves 10a and 10b in the sole plate 8 and the leg 6 and inserting the key 12 into these grooves.

At the inlet of the steam turbine, a main steam stop valve 20 (hereinafter referred to as MSV) for introducing or shutting off steam from a steam generator such as a boiler (see FIG. 10) is installed,
Although the high pressure casing 2 and the flange 21 are bolted together, it is still necessary to set and support the sole plate 22 in order to set the MSV 20 in height and fix the position.

[Problems to be solved by the invention]

As described above, in the prior art, a large number of sole plates were used for installation of one steam turbine, and a great deal of labor was required to set a level for each.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sole plate that can significantly reduce the time and labor required for arranging and fixing the sole plate.

[Means for solving problems]

The reason why a large number of sole plates are arranged in the prior art and the leveling is performed for each of them is to make it difficult to install the steam turbine when the sole plates are bent and the flatness deteriorates.

The present invention fundamentally converts the old technical idea when the sole plate is divided in order to prevent the sole plate from being bent, and provides the sole plate with a large rigidity so that the sole plate does not bend. It constitutes a sole plate. Thus, the shape and dimensions of this integral sole plate are configured to include the contours of the grounding portion of the entire steam turbine assembly including the casing to be installed and the front bearing housing.

However, in the present invention, the grounding portion of the steam turbine means the area in contact with the horizontal member supporting the weight of the steam turbine.

[Action]

With the above-described structure, since the sole plate is integrally formed, the leveling and installation / fixing of the sole plate can be performed quickly and easily.

〔Example〕

 1 to 5 show an embodiment of the present invention.

As shown in FIGS. 1 and 2, the sole plate 13 is
The conventional split structure is a completely integrated structure, and the fixing points 10 and 11 are provided on the structure, and the front bearing housing 3
A smooth surface is formed by machining on the portion where the legs 6 of the low-pressure casing 1 are mounted (the portion shown by hatching).

Further, in this embodiment, the sole plate 13 'for installing the MSV 20 is also integrally formed.

By integrating the sole plate 13, it is necessary to improve rigidity in order to prevent the bending of itself. The height from the upper surface of the T-G gantry 7 to the center of the turbine is called the center height, but it is desirable that this center height is as low as possible from the viewpoint of earthquake resistance and economical efficiency. It is good to consider and set it to the minimum height.

The center height can be maintained in the same manner as in the past by cutting the TG mount 7 by a thicker portion to maintain the rigidity of the sole plate 13, but since the TG mount 7 is made of reinforced concrete, it has a complicated shape. Since it is difficult to configure, it is T
-It is desirable from the viewpoint of manufacturing the G mount 7.

As shown in FIG. 2, since the sole plate 13 is integrally machined and its level and rigidity are secured, T-G
When setting on the pedestal 7, it suffices to place level adjusting tools 19 such as a leveling block at appropriate intervals, and thereby to raise the level of the sole plate 13.

Since a space corresponding to the height of the level adjuster 19 is formed between the T-G mount 7 and the sole plate 13, the space is filled with grout material and filled.

Since this grout material does not require a level adjustment later, a non-shrinkable material having good fluidity is used to improve the adhesiveness so that the lower surface of the sole plate 13 adheres closely.

FIG. 3 is a side view showing a state in which a steam turbine is installed on the sole plate 13 of the present embodiment, and is a view corresponding to FIG. 9 in the prior art example.

FIG. 4 is a front view seen in the direction of arrow A in FIG. 3, and FIG. 5 is a plan view seen in the direction of arrow B.

Next, an embodiment in which the sole plate of the present invention is used for transportation of a steam turbine will be described with reference to FIG.

The integral sole plate 13 having a shape and size capable of covering the grounding portion of the steam turbine is formed, and the steam turbine is assembled on the sole plate 13 at the production factory. During transportation, the height of the lower protruding portion 1a of the low pressure casing 1 is measured. By providing the transportation platform 14 capable of covering H, the steam turbine can be integrally transported.

〔The invention's effect〕

As described above, by applying the present invention and integrating the sole plate of the steam turbine, the sole plate setting operation can be simplified, and there is an excellent practical effect that the on-site installation period can be significantly shortened. .

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show a state in which an embodiment of a sole plate of the present invention is installed, FIG. 1 is a plan view, and FIG. 2 is a side view. 3 to 4 show an example in which a steam turbine is installed on a sole plate of the present invention, and FIG. 3 is a side view,
FIG. 4 is a view on arrow A of FIG. 3, and FIG. 5 is a view on arrow B. FIG. 6 is a side view showing an example in which the steam turbine is integrally transported by further developing the present invention. FIG. 7 is a plan view showing the layout of a conventional sole plate, FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7, and FIGS. 9 to 11 show a state in which a steam turbine is installed on a sole plate according to a conventional technique. Fig. 9 is a side view, Fig. 10 is a view taken in the direction of arrow C in Fig. 9,
FIG. 11 is a view as seen from the arrow D. 12 and 13 are explanatory views of the installation and fixing work of the conventional sole plate. 1 ... Low-pressure casing, 3 ... Front bearing box, 6 ... Leg,
7 ... TG mount, 8 ... sole plate, 8 '... sole plate, 9 ... grout pad, 10, 11 ...
Fixed point, 13 ... Integral sole plate, 13 '... M
SV sole plate, 19 ... Level adjuster.

Claims (3)

[Claims] 1. A sole plate for supporting a steam turbine having a front bearing box and a casing, the shape including a contour of a ground portion for supporting the weight of the entire steam turbine assembly including the front bearing box and the casing. An integral sole plate for a steam turbine, characterized in that it is integrally formed as a rigid member of. 2. The steam turbine according to claim 1, wherein the integral sole plate is provided with a plurality of fixing points which are base points of thermal expansion and contraction of the steam turbine. Integrated sole plate. 3. The sole plate is such that the sole plate does not exert a load on a lowermost portion of the steam turbine when the steam turbine is loaded on the sole plate. The integrated structure of the steam turbine according to claim 1, characterized in that the mounted steam turbine is provided with a frame that can be supported horizontally apart from the table so that the loaded steam turbine can be transported together with the sole plate. Sole plate.