JPS61237803A - Integrated transport frame for steam turbine - Google Patents

Abstract

PURPOSE:To raise the assembly reliability at a factory, and shorten the construction period at the actual place, by fixing an integrated transport frame which is loaded with a steam turbine, as it is, and constituting this steam turbine as it can be set permanently. CONSTITUTION:In transporting a steam turbine, a frame 13 used both for transportation and installation, and a frame 14 used only for transportation are integrated in one body. At this time, a low pressure casing 1 and a front bearing box 3 are fixed on the frame 13 respectively. Then, the turbine is transported as it is built up with said frames 13, 14 in an integrated one body. On the other hand, these frames 13, 14 are sorted at the actual place, and only the frame 13 is set on a T-G frame 7 as this frame 13 is loaded with the turbine and the valve which are transported with the frame 13 in an integrated one body. At this time, the level of the turbine can be maintained automatically, through taking the level of the frame 13 by a level adjusting tool, because the level of the turbine on the frame 13 is taken as a whole, that is from the front bearing box 3 to the low pressure casing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a frame for mounting and transporting a steam turbine in an assembled state.

[Background of the invention]

Steam turbines are driven by high-temperature, high-pressure steam, so
Regular inspections are required for the purpose of preventive maintenance against deterioration over time, and most of the parts have a horizontal joint surface and are designed to be disassembled, resulting in a huge number of parts.

After these parts are manufactured in the factory, they are brought to the local power plant and are processed according to their respective procedures.

The conventional method of general transportation and installation was to assemble the steam turbine-generator on a steam turbine-generator mount (hereinafter referred to as the T-G mount), which is the installation base for the steam turbine-generator. . With this method, a large amount of manpower is spent managing a huge number of parts at the construction site of a steam turbine plant, and small parts often get lost. Furthermore, at the 8-construction stage, assembly may be carried out in conditions where the working environment is not sufficiently prepared.
It has also become necessary to pay even more careful attention to maintaining reliability.

In recent years, with the development of transportation and construction equipment,
As it has become possible to transport fairly large and heavy objects, it is necessary to improve the working environment of steam turbines in order to avoid various risks such as loss, theft, and damage to parts during installation, and to shorten the construction period. Integrated transportation, in which products are assembled in well-equipped factories and then transported in the assembled state, is being considered and is being partially implemented. In this type of transportation and installation method, in order to transport steam turbines with complex shapes in one piece, a transportation pedestal that matches the shape of the product is made and the product is loaded onto it and transported. Take it out and place it on the T-G stand. Valves and auxiliary equipment attached to the steam turbine.

Installed after setting up the steam turbine.

In the integrated transportation of steam turbines according to the conventional technology described above, it is necessary to perform work such as setting the sole plate on which the steam turbine is placed and setting the valves before and after setting up the steam turbine, and during that period. It is necessary to allow for the corresponding construction period.

If the sole plate is abolished and the integrated transportation frame is set as is, the above work can be eliminated, but since the steam turbine uses high-temperature steam, there is an expansion and contraction effect of sliding on the sole plate, For low-pressure casings whose lower part extends long to accommodate the condenser, there is a technical difficulty in that the height of the transportation rack itself is high, so in conventional technology, as mentioned above, the sole plate is It was not possible to abolish it and set up an integrated transportation frame as is.

6 to 8 show the state in which the steam turbine is set on the T-G mount 7 by applying the prior art, FIG. 6 is a side view, FIG. 7 is a front view, and FIG. 8 is a FIG.

The steam turbine has a low pressure casing 1 and a high pressure casing 2.
Each casing is divided into upper and lower parts at the horizontal joint surface 4 and bolted together, making it easy to disassemble and inspect the turbine rotor, nozzle diaphragm, etc. built inside. .

On the front side of the high-pressure casing 2, a front bearing box 3 is installed, which contains a bearing for supporting one end of a turbine rotor and a control mechanism for controlling a steam turbine. The front end of the high-pressure casing 2 is supported by a support portion 15 of the front bearing box 3, and the rear end is supported by a vertical flange 5 formed between the high-pressure casing 2 and the low-pressure casing 1 by bolting.

The low pressure casing 1 is connected to a condenser (not shown) for returning steam that has done work in the steam turbine to water.
-G extends downwardly within the opening of the pedestal 7 (indicated by a broken line in FIG. 1).

The low-pressure casing 1 has legs 6 around its lower half, and supports the entire weight by placing the legs 6 on a sole plate 8 installed on the T-G frame.

A sole plate 8 for installing a steam turbine is set under the legs 6 of the low pressure casing 1 and under the front bearing box 3.

An example of setting the sole plate of the low pressure casing leg is shown in FIG. 9.

The upper end of the T-G pedestal 7 is lifted off a little to expose high-quality concrete, and the sole plate 8 is set on top of it. The sole plate 8 needs to be precisely leveled in order to properly install the low pressure casing of the turbine and the front bearing box, so a rectangular parallelepiped pad 9 is made with grout between the concrete surface and the sole plate 8. The level of the sole plate 8 is adjusted by adjusting the amount of shims 16 interposed between the plate 8 and the pad 9. A plurality of the above-mentioned sole plates 8 are usually provided, and each sole plate must be installed correctly and horizontally, and the sole plates must be precisely at the same level. The above-mentioned pads 9 are generally formed into a small size having a width of 100 to 200++v+, and are installed at intervals in order to facilitate manufacturing and installation adjustment.

Also, this pad 9 must be strong enough to support the entire load by itself, and the concrete that will be poured between the pads later will only fill the space and will not support the load. Must be. This is because it is a very difficult task to bring the post-cast concrete into complete contact with the sole plate 8.

If the sole plate 8 is set accurately in this manner, when the front bearing box 3 and the low-pressure casing 1 are installed on it, the levels of these items will naturally be ensured accurately. however,
for these tasks.

A certain amount of construction time will also be required.

Also, at the inlet of the steam turbine, there is a main steam stop valve 10 (for introducing or shutting off steam from a steam generator such as a boiler).
A steam control valve 11 (hereinafter referred to as MSVIO) (Figs. 7 and 8) is installed, which adjusts the amount of steam that passes through this MSVIO and enters the high-pressure casing 2 according to the load of the turbine.
is attached to the upper half of the high pressure casing 2. MSVI
O is connected to the high pressure casing 2 by a flange 12 that tightens the boiler, and in order to fix the set height and position of the MSVI 1, it is also necessary to set a sole plate and support it thereon.

[Purpose of the invention]

An object of the present invention is to provide an integrated mount for a steam turbine that can shorten construction time and improve reliability on-site by increasing the number of parts loaded on the mount for integrated transport of a steam turbine and reducing the number of sole plates. This is what I am trying to do.

[Summary of the invention]

The integrated frame of the present invention, which was created to achieve the above object, is such that the transport frame is directly installed on the T-G frame as part of the product, and valves, piping, auxiliary equipment, etc. are installed on the transport frame. This allows for loading. Therefore, depending on the shape of the steam turbine, the transport frame is divided into upper and lower halves, and the upper transport frame is set on the T-G frame as part of the product.
It is also possible to adopt a structure in which the lower transport frame is used only for transport.

[Embodiments of the invention]

Next, the present invention will be explained in detail with reference to FIGS. 1 to 5.

FIG. 1 is a side view of a steam turbine installed after being transported using the integrated transportation frame of the present invention.

Reference numeral 13 is a frame for transportation, and is a member that is installed as a frame even after installation.

FIG. 2 is a front view of the installed state shown in FIG. 1, viewed in the direction of arrow A. FIG. 3 is a plan view similarly seen in the direction of arrow B.

As described above, 13 is a frame for transportation and installation. As shown in Figure 1.

The low pressure casing 1 protrudes below the above-mentioned frame 13 for engagement with the condenser. Therefore, during transportation, a pedestal 14 as shown in FIG. 4 is provided below the transportation/installation pedestal 13 as a support member exclusively for transportation. Figure 5 shows the transportation packaging. As shown in FIG. 5, it is assembled on the steam turbine transport/installation frame 13 in the same manner as in the final installation state, and the long leg frame 14 covers the height dimension H of the downward protrusion 1a of the low pressure casing 1. It is supported by lifting it as much as possible.

(See Figure 1) The height from the T-G mount 7 to the horizontal joint surface 4, which is the center of the turbine, is called the center hide.
It is desirable that the center hide be as low as possible from the standpoint of earthquake resistance and economical efficiency, and for this reason, the height of the pedestal 13 should be set to the minimum considering its strength.

Therefore, in a turbine having a low-pressure casing 1 like the one in this embodiment, it is necessary to make a pedestal 14 only for transportation.
Can be made cheaper than 3.

When a steam turbine is operated, it expands due to temperature rise, and when it is stopped, it contracts. For this reason, the base of expansion and contraction is generally set at the low-pressure casing 1, and the front bearing box 3 slides on the pedestal 13. Therefore, the surface of the pedestal 13 must be precisely finished.

During transportation (the state shown in FIG. 5), the dual-purpose pedestal 13 and the transportation-dedicated pedestal 14 are bolted together.

When assembling at the factory, in order to minimize on-site work, not only the turbine body but also the MSVIO are set on a mount 13 with a seat 13' as shown in FIG.

The low pressure casing 1 and the front bearing box 3 are each fixed to the frame 13 with bolts. And the turbine is mounted on 13.14
Transport is carried out in the assembled state.

At the site, mounts 13 and 14 are separated, and only mount 13 is installed.
The turbine and valves that were transported together are placed on the T-G frame 7 as shown in FIG. 1.

The turbine on the pedestal 13 is leveled as a whole from the front bearing box 3 to the low pressure casing 1, so the T-
A leveling block (
Place level adjustment tools such as (not shown) at certain intervals,
If you adjust the level of the pedestal 13 using this level adjuster,
Naturally, the level of the turbine is also ensured. Since the leveling block has a certain height, a gap corresponding to the height of the leveling block is created between the pedestal 13 and the T-G pedestal 7, and this gap is filled with a ground material. Adhesion can be improved by using a non-shrinkable grounding material with good fluidity.

〔Effect of the invention〕

As explained above, by applying the integrated transport frame of the present invention, it is possible to assemble and transport a huge number of parts as one unit, and furthermore, the steam turbine transported in the assembled state can be transported using the sole plate. can be installed accurately and quickly without Furthermore, since the steam turbine can be assembled and transported in a well-equipped production factory, it is also effective in ensuring the reliability of the steam turbine.

[Brief explanation of the drawing]

1 to 3 show an example of a steam turbine transported and installed using the integrated transportation frame of the present invention, in which FIG. 1 is a side view, FIG. 2 is a view in the direction of arrow A in FIG. FIG. 3 is also a view in the direction of arrow B. FIG. 4 is an exploded perspective view of an embodiment of the integrated transport frame of the present invention, and FIG. 5 is a side view of a steam turbine being transported using the above embodiment. Figures 6 to 8 show an example of a steam turbine transported and installed using conventional technology,
6 is a side view, FIG. 7 is a view taken along arrow C in FIG. 6, and FIG. 8 is a view taken along arrow D in FIG. FIG. 9 is an explanatory diagram of a conventional sole plate. 1...Low pressure casing, 2...High pressure casing, 3
...Front bearing box, 6...Legs, 7...T-G mount,
8... Sole plate, 13... Frame for both transportation and installation, 14... Frame exclusively for transportation.

Claims (1)

[Scope of Claims] 1. In an integrated transportation frame on which a steam turbine is mounted and transported in an assembled state, the integrated transportation frame on which the steam turbine is mounted is placed on a steam turbine-generator installation base as it is. 1. A frame for integrally transporting a steam turbine, characterized in that the frame is configured such that the steam turbine can be permanently installed by fixing the steam turbine thereon. 2. The above-mentioned integrated transport frame has a structure that can be divided into upper and lower parts,
With the steam turbine still mounted on the upper frame,
2. The integrated transportation frame for a steam turbine according to claim 1, wherein the upper frame is configured to be permanently installed.