JPH03271505A - Installation method of steam turbine - Google Patents

Abstract

PURPOSE:To stably support a steam turbine by inserting jack bolts into four jack bolt holes on four corners of a turbine base while adjusting a bearing base or base plate, and then charging an unshrinking grout member between the turbine base and the bearing base or base plate. CONSTITUTION:A bearing base or a base plate 1 has four anchor bolt holes 6, four jack bolt holes 5 on four corners thereof. When installing, first, the bearing base or the base plate 1 is mounted on a turbine base 3. A sub-sole plate 7 is also mounted on the turbine base 3, four jack bolts 4 are inserted into the jack bolt holes 5, and the level of the bearing base or base plate 1 is adjusted by means of the jack bolts 4. An unshrinking grout member 2 is charged between the turbine base 3 and the bearing base or base plate 1, and solidified. The load of the steam turbine is totally supported by the unshrinking grout member 2.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an installation method for installing a bearing pedestal or a base plate on a turbine foundation, to which the load of a bearing and a casing that support a rotating body of a steam turbine is applied.

[Conventional technology]

FIG. 3 is a longitudinal sectional view of the turbine foundation and its surroundings showing a conventional method of installing a steam turbine, and FIG. 4 is a view of the bearing stand or base plate of FIG. 3 viewed from below. In FIGS. 3 and 4, conventionally, a bearing stand or stand vi1 supporting the full load of a steam turbine is used as a turbine foundation 3.
When installing the turbine, the bearing stand or base plate 1 is first placed on the turbine foundation 3. The bearing stand or base plate l is equipped with four anchor bolt holes 6 and a large number of jack bolt holes 5, and a subsole plate 7 is placed on the turbine base [3, jack bolts 4 are inserted into the jack bolt holes 5, and the jack bolts 4 are inserted into the jack bolt holes 5. Adjust the level of the bearing pedestal or bed plate l. Then, the space between the turbine foundation 1 and the bearing stand or base plate 3 was filled with grout 8 so that the subsole plate 7 and the large number of jack bolts 4 would not move one rotation. However, since the grout material 8 contracts when it solidifies,
There was a gap between the lower surface of the bearing stand or base plate 1 and the upper part of the grout material 8.

[Problem to be solved by the invention]

As steam turbines become larger, due to the increased weight of the turbine, there is a limit to the load that can be tolerated by the jack bolts 4 in conventional installation methods, so it is necessary to use many jack bolts and sub-sole plates, and it is necessary to use a large number of jack bolts and sub-sole plates. 1
It was difficult to adjust the jack bolts by placing a tool in a space of only about 10 cm with a large number of jack bolts arranged in the machine. In the conventional method of supporting the bearing stand or base plate 1 with a large number of jack bolts 4 and filling it with shrinking grout, vibrations generated from the equipment concentrate on the jack bolts, so if used for a long period of time, the jack bolts will be damaged. sometimes became loose and no longer supported the load. The present invention provides a method for installing a steam turbine in which the number of jack bolts is reduced and the entire load of the steam turbine is supported by a non-shrinkable grout material that fills the space between the bearing stand or bed plate and the turbine foundation. With the goal.

[Means to solve the problem]

The above purpose is to provide a method for installing a steam turbine in which a bearing stand or bed plate of a steam turbine is installed on a turbine foundation.
4 of the bearing stand or base plate placed on the turbine foundation;
Adjust the level of the bearing pedestal or bed plate by inserting a jack bolt into the corner jack bolt hole, then fill the space between the turbine foundation and the bearing pedestal or bed plate with non-shrinkable grout, and This is accomplished by supporting the entire load of the steam turbine with a shrinkable grout.

[For use]

According to this invention, the level of the bearing stand or bed plate is adjusted by inserting jack bolts into the jack bolt holes at the four corners of the bearing stand or bed plate placed on the turbine foundation, and then the bearing stand or the bed plate is placed on the turbine foundation. Since non-shrink grout material does not shrink, the space between the bearing stand or bed plate and the turbine foundation is completely filled and joined without any gaps, and the entire load of the steam turbine is carried. It can be supported over a wide area, and the non-shrinkable grout material can evenly support vibrations generated from equipment.

【Example】

The present invention will be described in detail below based on the drawings. FIG. 1 is a longitudinal cross-sectional view of a turbine foundation and its surroundings showing a method of installing a steam turn according to an embodiment of the present invention, and FIG. 2 is a view of the bearing stand or base plate of FIG. 1 viewed from below. In FIGS. 1 and 2, the same parts as in FIGS. 3 and 4 are given the same numbers. In FIGS. 1 and 2, the bearing pedestal or base plate 1 is provided with four anchor bolt holes 6 and four jack bolt holes 5 at the four corners. First, the bearing stand or base plate 1 is placed on the turbine foundation 3. A sub-sole plate 7 is placed on the turbine foundation 3, four jack bolts 4 are inserted from the jack bolt holes 5, and the level of the bearing stand or base plate 1 is adjusted using the jack bolts 4. Next, a non-shrinkable grout 2 is filled between the turbine foundation 1 and the bearing stand or bed plate 1 and allowed to solidify. This non-shrinkable grout material 2 has the following properties. ■Fillability: It has the necessary fluidity to easily fill a given gap and completely fills the gap. ■Non-shrinkage: The grout material that fills the gaps does not create voids in the contact area due to material separation or shrinkage, and maintains its original volume. ■Performance: The grout material that fills the gaps satisfies the following conditions required for the structure. B. Transfer the load of the structure or machine evenly to the foundation. (b) Sufficiently withstands shock loads, horizontal force, two-turn torque, repeated loads, etc. C. Durable against thermal influences and repeated drying. 2. Shows early strength. The lower surface of the bearing pedestal or bed plate 1 is machined in advance to make it smooth, so the non-shrinkable grout 2 can be bonded to the bearing pedestal or bed plate 1 without any gaps or gaps. Material 2 is joined. In this way, the entire load of the steam turbine is supported by the non-shrinkable grout 2.

【Effect of the invention】

This invention involves inserting jack bolts into the jack bolt holes at the four corners of the turbine foundation to adjust the level of the bearing pedestal or bed plate, and then applying non-shrinkable grout between the turbine foundation and the bearing pedestal or bed plate. By filling this space with non-shrinkable grout without any gaps and joining them 1, the vibrations generated from the equipment can be evenly supported by the entire surface of the non-shrinkable grout. In addition, many surfaces of the bearing pedestal or bed plate have been machined to make them smooth, increasing the holding load on the joint surface between the non-shrinkable grout and the bearing pedestal or bed plate, stably supporting the steam turbine. be able to. According to this method, there is no need to install a large number of jack bolts as in the past, and only four bolts are required, so the installation work of the bearing stand or base plate can be completed in a short time, and the load is not concentrated on the jack bolts, so it can be used for a long time. The bolt does not loosen even after long periods of operation.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the turbine foundation showing an installation method according to an embodiment of the present invention, Fig. 2 is a view of the bearing stand or bed plate shown in Fig. 1 viewed from below, and Fig. 3 is a conventional installation method. FIG. 4 is a view of the bearing stand or base plate of FIG. 3 viewed from below. 1: Bearing stand or bed plate, 2: Non-shrinkable grout, 3:
Turbine foundation, 4: Jack bolt, 5: Jack bolt hole, 8 Niger loud material. 1!Figure 1Figure 3

Claims (1)

[Claims] 1) In a steam turbine installation method in which a bearing stand or bed plate of a steam turbine is installed on a turbine foundation, jack bolts are inserted into jack bolt holes at four corners of the bearing stand or bed plate placed on the turbine foundation. , the level of the bearing pedestal or bed plate is adjusted, and then the space between the turbine foundation and the bearing pedestal or bed plate is filled with a non-shrinkable grout, and this non-shrinkable grout is used to completely cover the steam turbine. A method of installing a steam turbine characterized by supporting loads.