JPS6078034A - Steel enclosure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to steel frames.

The equipment that makes up various plants includes large rotating machines such as compressors, turbines, and motors, which can be called the heart of the plant. Conventionally, the structures used to support these machines in predetermined positions were constructed of reinforced concrete. Frames and steel frames are known.

The former has been common mainly in the United States and Japan,
The latter is mainly popular in Europe, but has recently been recognized for its various advantages, and there are signs that it will become popular in Japan as well.

However, steel frames are lighter than reinforced concrete frames and have a lower imaging attenuation rate, so it is essential to consider design measures and vibration analysis to prevent vibrations and avoid resonance with mechanical vibrations. It is.

The steel frame consists of a single steel base that directly supports multiple large rotating machines, and multiple steel columns that support this, and the steel columns are further supported by the foundation. Therefore, if you make the steel base as rigid as possible and the steel support as thin as possible to support the machine and the base softly, and avoid resonance of the entire frame due to machine vibration, the steel support It is important to minimize the vibrations transmitted to the foundation.

Furthermore, since the installation height of large rotating machinery is determined from a functional standpoint, the height and length of the steel support cannot be determined either, so the support must meet the above conditions within this limit. However, it is important to safely support the weight of the machine and the base, and to prevent the steel support itself from resonating with the vibrations of the rotating machine.

The present invention was proposed in view of the above circumstances.
The purpose is to provide a steel frame with high vibration isolation.

To this end, the present invention provides a steel frame in which a machine is mounted on a steel platform supported by a plurality of steel columns established on a foundation, in which a part or all of the above-mentioned columns are attached to the steel frame as a whole. It is characterized by a fixed balance weight to avoid resonance with the machine.

One embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a side view thereof, Fig. 2 is a partially enlarged longitudinal cross-sectional view showing the steel hollow column in Fig. 1, and Fig. 3 is a section III-- in Fig. 2. In G5
FIG.

In the above diagram, 1 is a large rotating machine, 2 is a steel base, 3 is a steel hollow column, 4 is a foundation, 5 is the ground, 6 is concrete, and 7 and 8 are each installed inside the steel hollow column 3. These are a lower diaphragm and an upper diaphragm for concrete filling with stiffeners protruding from the upper and lower surfaces, respectively.

In such a steel frame, a plurality of large-sized rotating machines 1 are arranged on one common steel base plate 2, and the steel base plate 2 is supported by a plurality of steel hollow supports 3. Pillar 3
is further supported by a foundation 4, and the foundation 4 is supported by the ground 5.

Here, the steel platform 2 and the plurality of steel hollow columns 3 that support it are collectively referred to as a steel frame.

Inside the center of the steel hollow column 3, concrete 6 is filled into a space formed by the concrete 1, the lower partition plate 7 for filling, and the upper partition plate 8.

The cross-sectional shape of the steel hollow support need not be limited to a square, but may be rectangular or round, and supports such as shaped steel may be used instead of the hollow support.

Furthermore, instead of filling with concrete or the like, metal pieces may be directly welded to predetermined locations on the support, or a box may be attached and a predetermined balance weight may be placed in the box.

In this way, the natural frequency of the support can be adjusted by attaching a predetermined balance weight to the support.

According to such a steel frame, by filling part or all of the steel support 3 with concrete, etc. 6, the natural frequency of the support 3 itself can be adjusted to the length, thickness, and section of the steel plate of the support 3 itself. Since it can be freely adjusted without changing the area, it is possible to easily plan the vibration isolation design of the entire frame.

In short, according to the present invention, in a steel frame in which a machine is mounted on a steel platform supported by a plurality of steel columns established on a foundation, part or all of the above-mentioned columns are attached to the entire steel frame. The present invention is industrially very useful because a lightweight vibration-proof steel frame is obtained by fixing the balance weight to avoid resonance to the machine.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing one embodiment of the present invention.
FIG. 3 is a partially enlarged vertical sectional view showing the hollow steel support column shown in FIG. 1...Large rotating machine, 2...Steel base, 3...Steel hollow support, 4...Foundation, 5...Ground, 6...Concrete, 7...Lower partition Plate, 8...upper septum. Sub-Agent Patent Attorney Masafumi Tsukamoto

Claims (1)

[Claims] In a steel frame in which a machine is mounted on a steel platform supported by multiple steel columns established on a foundation, some or all of the above columns are used to avoid resonance of the entire steel frame to the machine. A steel frame characterized by a fixed balance weight.