JPS6137843B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a closed switchboard whose earthquake resistance is improved by using a reinforcing frame.

Conventional methods to improve the earthquake resistance of closed switchboards include inserting strong frames between closed switchboards to increase rigidity, or supporting the tops of the panels by extending their arms from the walls of the building.

However, when a frame is inserted between the boards, for example, it is difficult to increase the rigidity of the frame itself because the thickness of the frame cannot be made very thick. In particular, the rigidity of the board in the left and right direction could not be increased.

Furthermore, when supporting arms are extended from the walls of the building, there is a risk that a phase difference will occur between the vibrations of the building during an earthquake and the vibrations of the top of the board. In that case, there was a risk that unexpected stress would occur at the top of the board.

In addition, in any of these cases, the provision of reinforcing frames and arms increases the weight and raises the center of gravity, which has the effect of making it difficult to increase the rigidity of the entire board.

The object of the present invention is to attach a reinforcing frame with a large section modulus to the outer surface of a standard box body, and to insert stripes at the top and bottom of the approximately central part of the box body in the depth direction, and to attach the reinforcing frame to the reinforcing frames located on both sides of the board. The object is to obtain a closed switchboard with great rigidity by connecting the two.

The structure of the present invention will be explained in detail below with reference to the embodiments shown in FIGS. 1 to 5.

In FIGS. 1 and 2, reference numeral 1 denotes a general type switchboard box, and a reinforcing frame 2 is fitted around its entire circumference. Here, as shown in FIG. 3, the general type switchboard box 1 has an inter-panel through hole 1 extending in the vertical direction at the center in the depth direction.
It is mainly composed of a pair of side plates 1b having a side surface 1a, and a connecting plate 1c connecting these side plates 1b to each other.

On the other hand, the reinforcing frame 2 is made by assembling a frame material 2a in the shape of a lip groove, which is made by bending a thin plate, and attaching reinforcing plates 2b at each important point to increase torsional strength, as shown in Fig. 4a and b. A plurality of lateral reinforcements 12 are provided and joined together, and gussets 2c as shown in FIG. 4b are attached to the corner portions.

As shown in FIG. 2, the reinforcing frame 2 having such a structure is shown in FIG.
After installing along the left and right sides of the general type switchboard box 1, as shown in FIG. They are placed above and below the horizontal generatrix 1e so as not to interfere with the construction. Then, each end portion is fixed to the horizontal reinforcement 12 of the left and right reinforcement frames 2, respectively. That is, as shown in FIGS. 5a and 5b, this strip line 3 is located on the back side of the vertical generatrix 1d like the horizontal generatrix 1e, so it is located in the middle in the depth direction of the board, and also connects and fixes the left and right reinforcing frames 2. ing.

According to the above configuration, a strong reinforcing frame 2 is fixed along both left and right sides of a general closed switchboard box 1,
In addition, the middle part in the depth direction of the left and right reinforcing frames 2 is connected to the box body 1.
Because it is fixed with the inner sujikai 3, the section modulus can be increased without increasing the size of the entire board.Furthermore, each member is welded together and has extremely high rigidity, so it can withstand earthquake forces. The amount of deformation of the closed switchboard caused by this can also be minimized.

As described above, according to the present invention, a compact closed switchboard with excellent earthquake resistance can be easily obtained using a general type switchboard box made of a steel plate panel or the like.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of the position of a closed switchboard according to the present invention, Fig. 2 is an exploded perspective view showing a specific configuration of the one shown in Fig. 1, and Fig. 3 shows a box used in the present invention. Exploded perspective view, Figures 4a and b are views showing the shape of the reinforcing material used in the present invention, Figures 5a and b
FIG. 1 is a rear view and a side view showing essential parts of the present invention. 1... Box body, 1a... Penetration between panels, 2... Reinforcement frame, 3... Sujikai, 12... Horizontal reinforcement.

Claims (1)

[Scope of Claims] 1. A box body provided with vertically long inter-panel through holes in the middle of both side plates in the depth direction, and a box body provided along both left and right sides of the box body and in the middle part in the height direction. a reinforcing frame having a plurality of horizontal reinforcements; and a reinforcing frame provided at the upper and lower portions of the box body, each end of which is connected to the horizontal reinforcements of the reinforcing frame located on both sides of the reinforcing frame through the inter-panel through hole; Closed switchboard with. 2. The closed switchboard according to claim 1, wherein a steel plate formed into a lip groove shape is used as the frame material of the reinforcing frame.