JPS5943764Y2 - stationary equipment - Google Patents

Description

[Detailed explanation of the invention] The second invention relates to a device for firmly mounting objects, especially switchboards for atomic couplants, etc., which require earthquake resistance, on the floor.

Hereinafter, the conventional installation device and the installation device of this invention will be explained in the case where the object to be swayed is a switchboard.

The installation part of a conventional switchboard is shown in Fig. 1.

Figure 1 shows a cross section of the installation part. In the figure, 1 is a switchboard, 2 is a floor, 3 is a base that is the basis for installing the switchboard 1 on this floor, and 4 is a part of the frame of the switchboard 1 for installation. The bottom frame 5 is the bottom frame 4 and the base 3.
6 is a foundation bolt embedded in floor 2 to connect base 3 and floor 2, 7 is a 5 degree inclined washer that is required when channel steel is used as base 3, 8 is a Nut, 9 is a spring washer, and 10 is a flat washer.

Next, FIG. 2 shows a case where a force such as an overturning moment due to an earthquake force is applied to the switchboard 1.

In FIG. 2, 1 to 10 indicate the same things as in FIG. and the bottom frame 4.

In Figure 2, when force F is applied, base 3 moves bolt 5
The concentration of force causes local bending deformation around the foundation bolt 6, and also causes deformation of the cross-sectional shape as a whole.

For this purpose, a displacement ci1t d2 is generated.

Therefore, the bottom frame 4 is displaced from the floor 2 by d1+d2.

In FIG. 2, if the force F is applied in the opposite direction to that shown in the figure, the displacement of the bottom frame 4 will also be approximately d1+d2 in the opposite direction to that shown in the figure.

Another arrangement of the installation part of a conventional switchboard is shown in Fig. 3.

Figure 3 shows a cross section of the installation part, and in the figure, 1 to 4, 6
．． 8 to 10 are the same as those shown in FIG. 1, and 11 is a plate laid on the floor 2 on which the base 3 is placed.

Next, FIG. 4 shows a case where a force such as an equidistant moment due to an earthquake force is applied to the switchboard 1.

In FIG. 4, 1 to 4 and 6.8 to 11 are the same as in FIG. 3, F is a force, and d3 is a displacement of the bottom frame 4 caused by the force F.

In FIG. 4, when a force F is applied, the cross-sectional shape of the base 3 is deformed as shown in the figure, resulting in a displacement d3.

Conventional switchboards were installed in the manner described above, which caused them to rise or sink due to earthquake forces and the like, making it impossible to install them firmly.

As a countermeasure for this, we changed the steel material for base 3 from the conventionally used channel steel and angle steel to a thick steel material that has a cylindrical shape and is difficult to cause local bending deformation. It is possible to consider changing to a material with a thicker wall, but there is no material that meets the current dimensional standards for steel materials, and using a non-standard material would result in a significant increase in cost, which is not preferable.

Furthermore, in the installation part shown in FIG. 1, it is conceivable to extend the foundation bolts 6 to the bottom frame 4 so as not to cause displacement in response to the upward force F, and to directly fix the bottom frame 4 with the foundation bolts 6. In this method, the foundation bolt 6
There was a drawback that the base 3 would be deformed when tightened.

Moreover, eliminating the base 3 requires precision on the installation surface, which has the disadvantage of increasing the cost of the floor surface.

The mechanical properties of a switchboard, especially its vibration resistance, depend on the rigidity of the switchboard as a whole.

The stiffness of the entire switchboard is K2, where KF is the stiffness of the switchboard body, and KF-KB is the stiffness of the entire installation part.

KF1KB Conventional KB is smaller than KF.

Furthermore, even if KF is infinite, K will not be one shift greater than KB.

In other words, the vibration characteristics of the switchboard cannot be improved without improving the rigidity of the installation part.

This idea was made in order to eliminate the drawbacks of the conventional ones as mentioned above. By making only the bolt tightening part of the base a highly rigid block, it is possible to use the same installation technique and price as the conventional installation method. The installation is intended to provide the device with a solid installation.

This idea will be explained below with reference to the drawings.

FIG. 5 shows a switchboard base according to an embodiment of this invention. In FIG. 5, reference numeral 12 denotes a highly rigid hexahedral foundation block, which in this embodiment is shaped like a square prism.

13 is a hole made in the foundation block 12 to penetrate the foundation bolt for installing the switchboard; 14 is a base frame that connects the foundation blocks 12 together, maintains the distance between the blocks, and arranges the appearance after installation. It is.

FIG. 5 shows a case where channel steel is used as the base frame 14.

FIG. 6 shows the installation part of the switchboard when the switchboard base of FIG. 5 is used, and corresponds to FIGS. 1 and 3 of the conventional method.

In the figure, 1,2°4.6.8~10 are in Figure 1 and 3.
Shows the same thing as the figure.

12 indicates the same thing as in FIG. Fl is an upward facing sword,
F2 indicates downward force.

Next, referring to FIG. 6, a case where an upward force F1 is applied to the switchboard 1 will be described.

In this case, the sword F1 acts as a sword that stretches the foundation bolt 6.

The foundation bolt 6 produces an elongation d due to the force F1, but this value can be easily reduced by increasing the diameter of the foundation bolt 6.

Furthermore, if the foundation bolts 6 and the foundation blocks 12 are made of materials with the same Young's modulus, if they are installed so that the foundation bolts 6 have an initial stress σ, the tensile stress σ1 generated in the foundation bolts 6 by the force F1 will be the initial stress. If it is smaller than σ, no displacement occurs.

Next, referring to FIG. 6, a case where a downward force F2 is applied to the switchboard 1 will be described.

In this case, the force F2 acts as a force that compresses the foundation block 12.

The displacement of the foundation block 12 due to compression is minute and can be ignored.

In the above embodiment, the base frame 14 is made of channel steel, but any member that can connect the foundation blocks 12 may be used, for example, a round bar may be used.

As described above, according to this invention, the bolt tightening part of the foundation on which objects such as switchboards are placed is made into a block, so objects can be firmly fixed to the floor without major changes to conventional installation techniques. Easy installation has the effect of making the device easy to manufacture with a small increase in price.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the conventional switchboard installation section, and Figure 2
The figure is a sectional view showing the deformation of the power distribution board installation part in Figure 1 due to external force, Figure 3 is a sectional view showing another example of the conventional power distribution board installation part, and Figure 4 is a sectional view of the power distribution board installation part in Figure 3. FIG. 5 is a cross-sectional view showing deformation due to external force, FIG. 5 is an external view of an installation such as a switchboard base according to an embodiment of this invention, and FIG. 6 is a cross-sectional view of FIG. In the figure, 1 is an object such as a switchboard, 2 is a floor, 4 is a bottom frame of object 1, 6 is a foundation bolt, 8 is a nut, 9 is a spring washer, 10 is a flat washer, 12 is a foundation block, and 13 is a hole. . In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A plurality of highly rigid hexahedral foundation blocks provided on the floor on which objects are placed; a through hole drilled in the foundation blocks; An installation device comprising foundation bolts to be fixed to the foundation blocks, and a plurality of frames interposed between the foundation blocks and interconnecting the foundation blocks.