JPS5821285Y2 - Fixing device for switchboard - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for fixing a power distribution board that requires seismic performance.

For example, in a case housing a control device that requires a high degree of reliability, such as a switchboard for a nuclear power plant,
It is necessary to mechanically secure the casing to protect the control device from earthquakes.

Hereinafter, a conventional switchboard and this invention will be explained using a switchboard as an example.

The connection section of a conventional power distribution board will be explained by taking the installation section as an example.

The installation part of a conventional power distribution board is shown in FIG.

In the figure, 1 is the frame at the bottom of the switchboard, 2 is the foundation bolt for fixing the switchboard to the foundation, 3 is a NAND, and 4 is welded to the bottom frame 1 to pass through the foundation bolt 2 and tighten with NAND 3. , 5 is a flat plate having a thickness comparable to that of the bottom frame 1, and 5 is a main body frame.

The flat plate 4 is necessary when it is difficult to directly tighten the base frame 1 with the foundation bolts 2.

For example, if the foundation bolts 2 are larger than the bottom frame 1, or if you try to directly tighten the bottom frame 1 with the foundation bolts 2 and 3, it is difficult to use a wrench because of the bottom frame 1, As shown in the figure, a flat plate 4 is welded to the bottom frame 1, and this flat plate 4 is fastened to the foundation with foundation bolts 2 and NANDs.

FIG. 2 is an explanatory diagram showing the deformation of the installation part shown in FIG. 1 due to an earthquake, and shows a cross section taken along a plane connecting the foundation bolt 2 and the main body frame 5.

1 to 5 are the same as in FIG. 1, and 6 indicates welding for connecting the bottom frame 1 and the flat plate 4.

In the figure, if an upward force F is generated on the main body frame 5 due to an earthquake force applied to the switchboard, the force applied to the switchboard will be concentrated on the foundation bolts 2 that fix the switchboard, so the foundation bolts 2 and the surrounding flat plate 4 A particularly large stress is generated in this area compared to other areas, and the flat plate 4 causes local bending deformation around the foundation bolt 20.

In addition, the cross-sectional shape of the bottom frame 10 between the main body frame 5 and the foundation bolt 2 is deformed, and as a result, the uplift d of the switchboard becomes maximum right below the main body frame.

In other words, only the switchboard main body d will be lifted up, and there is a risk that the reliability of the control device housed in the switchboard will be impaired.

Conventionally, the overall thickness of the steel that makes up the switchboard body has been increased to improve seismic performance, but it is uneconomical to increase the thickness of the steel in areas other than the installation area.

This invention aims to eliminate the above-mentioned unreasonableness and economically obtain the required rigidity of the entire switchboard.

An embodiment of this invention will be described below with reference to the drawings.

FIG. 3 is a perspective view showing an embodiment of the housing fixing device in a power distribution board according to the invention.

In Figure 3, 1, 2, 3, and 5 are the same as in Figure 1, and 7 is
The thickness is more than twice that of the bottom frame 1, which penetrates the foundation bolt and is welded at the right angle part 7a that contacts the corner of the bottom frame 1 on the same plane for tightening with the NAND 3. It is a flat plate with a

This corresponds to 4 in FIG.

FIG. 4 shows the operation of this invention, and is a sectional view taken along a plane connecting the foundation bolt 2 and the main body frame 5 in FIG.

1 to 3, 5.7 are the same as in FIG. 3, and 6 indicates welding for connecting the bottom frame 1 and the thick flat plate 1.

In the figure, when an earthquake force etc. is applied to the switchboard and an upward force F is applied to the main body frame, the force applied to the switchboard is concentrated on the foundation bolts 2 that fix the switchboard, but the thick plate 1 around the foundation bolts 2 is It is thick enough so there is little deformation.

Also. The flat plate T is connected to the bottom frame 1 at a certain length by welding 6, and the force transmitted from the bottom frame 1 to the foundation bolts 2 is sufficiently dispersed over that length, so that the cross-sectional shape of the bottom frame 1 is It works to prevent deformation.

As a result, the main body of the switchboard rises by an amount d, but this value is very small compared to the conventional method.

Although the above embodiments have been described with respect to the installation section, the same effect can be achieved in connection with power distribution units and other equipment.

Further, in the above embodiment, this invention has been described with respect to a power distribution board, but it is clear that this invention can be generally applied to cases where a housing is firmly fixed, and that similar effects can be achieved.

As described above, according to this invention, a thick plate is welded to the frame as a reinforcing member to create a highly rigid connection part.
without changing the overall structure of the housing such as a switchboard.
A housing with high overall rigidity can be obtained at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional installation part of a case such as a switchboard, Fig. 2 is a cross-sectional view showing the function of the installation part of a conventional case, and Fig. 3 is a switchboard according to an embodiment of this invention. FIG. 4 is a perspective view showing the installation part of the case shown in FIG. 3, and FIG. 4 is a sectional view showing the function of the installation part of the case shown in FIG. In the figure, 1 is a frame at the bottom of a casing such as a switchboard, 2 is a bolt such as a foundation bolt, 3 is a bolt, 5 is a main body frame of the casing, 6 is a welded portion, and T is a thick plate. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A reinforcing member that is welded at a right angle that abuts on the same plane as the corner of the bottom frame of a switchboard, etc., and has a wall thickness greater than that of the switchboard frame, and this reinforcing member is attached to the foundation or other casing on which the switchboard is placed. A fixing device for a switchboard equipped with a tightening member and a tightening member.