JPH02130500A - Glove box - Google Patents

Abstract

PURPOSE:To absorb force from the outside such as earthquake and improve earthquake-proof safety by providing a plurality of wire ropes between a body fixed floor and a body bottom portion to set slidable support legs between said body fixed floor and body bottom portion. CONSTITUTION:A plurality of wire rope earthquake-proof supports 15 are supported on a fixed floor 16 and bottom materials 9 of a globe box 20. A plurality of support legs 17 for supporting a vertical load at the normal time are provided between the fixed floor 16 and the bottom materials 9. When the outside force such as an earthquake is produced on a building and a structure, energy is absorbed by proper damping produced by the friction between the strands of the rope as maximum displacement is controlled by a hardening characteristic of the wire rope earthquake-proof supports 15 to ideally damp a globe box 20. Further, since the fatigue characteristic of the wire rope earthquake-proof support 15 is superior, the earthquake-proof and reliability such as the globe box 20 or a device set in the globe box can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a glove box with a color layer device.

(Prior art) Glove boxes handle radioactive materials such as plutonium inside, so if the glove box were destroyed during an earthquake and the air containing plutonium inside was released to the outside, it would cause great damage to one person. expected to give.

FIG. 9 shows a front view of a conventional glove box.
Figure O and Figure 11 are views taken along the arrow A-A in Figure 9, respectively.
A BB arrow view is shown. The glove box 1 is constructed by assembling structural members such as pillars 2 and beams 3 made of stainless steel or common steel into a cube or rectangular parallelepiped, into which a window material 4 made of acrylic resin or glass is fitted, and a frame 5 is attached to the lower part. A port 6 is installed in the window material 4, and a glove (not shown) is connected inside the window material 4, and a human hand is inserted into the glove to perform work inside the glove box. Also, side material 7.
Ceiling material 8. The bottom material 9 is made of stainless steel, etc., and the sides are used for carrying in equipment etc. installed in the glove box l.
A large port IO is provided with a lid that can be attached and removed by bolting so that it can be removed.

Further, the joint portion between the pillar 2 or beam 3 of the glove box 1 and the window material 4 will be explained with reference to FIG. 12. FIG. 12 is a sectional view taken along the line CC in FIG. 9 for explaining the joint between the pillar 2 and the window material 4, and the pillar 2 has an overhanging portion 11;
The window material 4 is pressed into contact with this projecting portion 11 via a rubber gasket 12, and the window material 4 is fixed to the pillar 2 by an angled contact member 13.

The member 13 is fixed to the column 2 with bolts 14.

(Problems to be Solved by the Invention) The seismic resistance problems of the glove box in the above-described structure include the fact that relaxation of stress concentration at the joints of the columns 2 and 3 is inherently difficult from the viewpoint of the structure; , simply from around the window material 4 via the gasket 12 to the pillar 2, which is a structural member.
In the conventional structure where the beam 3 only holds down the window material 4,
One point is that it is difficult to solve the fundamental "gap" problem.

When considering a glove box with excellent earthquake resistance, one method is to make the entire glove box a rigid structure, which will sufficiently separate the natural frequency of the glove box from the natural frequency of the building and reduce the risk of mutual resonance. It is considered effective to avoid this and to suppress relative displacement of each part of the glove box.

When the glove box has a rigid structure, its primary natural frequency needs to be 20 Hz or more in order to avoid resonance with the natural frequency of the storage building and the input seismic waveform.

However, in glove boxes with a conventional structure, the primary natural frequency is several H, except for some small glove boxes.
It remains within the range of z.

The main reason for this is that in conventional structures, structural members such as pillars and window materials are in contact with each other through cushioning means such as rubber, so the force flow of the structural members is not sufficiently transmitted to the window material, causing vibrations. This is because the two move independently and independently.

In other words, since the window material itself plays the role of "additional mass" attached to the structural member during vibration, the window material is not utilized as part of the structure. This is the reason why the current natural frequency of the glove box is low.

Regarding the sealing performance of the glove box, with the conventional structure described above, there is a risk that a gap will form in the shield part of the window material in the event of an earthquake.

Furthermore, from the viewpoint of manufacturing the glove box, the conventional structure requires high assembly accuracy, and therefore requires strict dimensional accuracy for each member, resulting in increased manufacturing costs.

In other words, the difficulty of maintaining sealing between the window material and the structural member is a major factor.

On the other hand, in order to confirm the soundness of the containment function of glove boxes in the event of an earthquake, seismic demonstration tests have been conducted in some cases, and for the same type of specimens used in the tests,
There are also examples where seismic safety has been demonstrated. However, since the above test is a type test, there is a problem in that the results cannot be applied to products with the same basic structure. Further, even if the structure is the same, there is a problem that the test results cannot necessarily be used effectively for earthquake motions that have frequency characteristics different from those used during the test.

In addition, not all equipment installed in the glove box is fixed, and the installed type of tray may contain plutonium powder, so there is a risk that it may fall during an earthquake and the powder may scatter into the glove box. There is.

The present invention was made in consideration of the problems that occur in the conventional glove box, and uses a seismic isolation device that has good vibration characteristics, fatigue characteristics, and maintainability to protect against external forces such as earthquakes. The purpose of the present invention is to provide a glove box capable of absorbing earthquakes and greatly improving seismic safety without changing the basic structure of the conventional glove box.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the glove box of the present invention includes a wire rope seismic support having good transmission characteristics and damping properties between the fixed floor and the bottom of the glove box. However, the vertical load of the glove box is supported by support legs that can freely slide on a fixed floor surface.

(Function) Therefore, in the glove box according to the present invention, in response to external forces such as earthquakes, the wire rope seismic support receives the load and pulls, rolls, and provides flexible spring support. Friction between the two causes large damping. Further, the vertical load of the glove box is always supported by the support legs, and when a horizontal load is applied to the fixed floor, the glove box freely slides on the fixed floor surface by the sliding member.

(Example) FIG. 1 is a front view showing an example of the seismic isolation device according to the present invention, FIG. 2 is a view taken along the line D-D in FIG. 1, and FIG. FIG. Also the fourth
The figure shows the wire rope seismic support 15 shown in Figure 1.
It is a perspective view which expands and shows. In addition, Figures 1 to 3
In the figure, the same parts as in FIGS. 9 to 11 are given the same reference numerals, and the explanation of the structure of the parts will be omitted.

1-3, a plurality of wire rope seismic supports 15 are supported by a fixed floor 16 and a bottom member 9 of a glove box 20. As shown in FIGS. Similarly, between the fixed floor 16 and the bottom material 9, there are a plurality of support legs 1 to support the vertical load during normal times.
7 is provided.

In Figure 4, this wire rope seismic support 15
has a structure in which a stainless steel wire rope 18 is wound, for example, in a spiral shape and tightened with two adhesive tapes 19 at the top and bottom, respectively. In addition, the wire rope seismic support 15 has a wire rope 18 with a diameter of 1
It is selected by changing the number of turns, length, etc.

Now, Figures 5 and 6 show state models when a horizontal load is applied to the wire rope seismic support 15.

Moreover, the relationship between load and displacement at that time is shown in FIG.

As can be seen from FIG. 7, the load-displacement relationship is a hardening curve, so compared to one having a linear characteristic, the load is clearly a little larger when energy due to external force is absorbed at the same displacement. On the other hand, if we absorb energy due to external force with the same load, the displacement will obviously be slightly smaller.Therefore, as the impact increases, the amount of increase in displacement relative to the load will be smaller.Although the absorption of energy will increase with the load, the maximum displacement will increase. is not large, so the displacement of the glove box 20 with respect to the fixed floor 16 is relatively small compared to the load.

In addition, the transmission characteristics of the wire rope seismic support 15 were
As shown in the figure. According to this, the higher the frequency ratio, the greater the degree of vibration damping.

Therefore, the wire rope seismic support 15 is fixed floor 16
Resonance frequency f lower than 1/2 of the natural frequency of buildings and structures including It is desirable to select a material that has a large displacement that can be relaxed to the maximum extent without causing permanent deformation under large loads.

According to the above embodiment, when an external force such as an earthquake occurs in a building or structure including a fixed floor, the wire rope seismic support 1
While suppressing the maximum displacement due to the hardening characteristics of No. 5, energy is absorbed by moderate damping caused by friction between the strands of the wire rope 18, and the glove box 20 is suitably damped. Furthermore, since the wire rope seismic support 15 has excellent fatigue characteristics, the seismic resistance and reliability of the glove box 20 installed on a fixed floor or equipment installed within the glove box 20 can be improved.

Furthermore, since the vertical load of the glove box 20 is supported by the support legs 17 placed around the glove box 2o, the wire rope seismic support 15 can be freely placed, and the structure is simple, making quality control and maintenance management easy. It is.

〔Effect of the invention〕

As described above, according to the glove box according to the present invention, since the wire rope seismic support and supporting legs are installed between the fixed floor and the glove box bottom material, the glove box and the glove box are protected against external vibrations caused by earthquakes and the like. The response to the equipment in the glove box can be reduced well, and the vibration of the floor can be suitably damped because it is damped by the frictional force between the strands of the wire rope.

Therefore, it is possible to greatly alleviate the stress concentration that occurs at the joints of the columns and the joints, and it is possible to significantly improve earthquake resistance, which has been a problem in the past. Furthermore, since the glove box according to the present invention has the above-mentioned effects, the basic structure of the glove box body can be applied regardless of the vibration characteristics of the building/structure or site where the glove box is installed. At the same time,
Existing verification test results can be effectively utilized.

Furthermore, since the wire rope seismic support has excellent fatigue properties, quality control and maintenance management of the equipment is almost unnecessary. Additionally, since the vertical load of the glove box is supported by the support legs, the layout margin of the wire rope seismic support can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the glove box according to the present invention, FIG. 2 is a view taken along the line D--D in FIG. 1, and FIG. Figure 4 is an enlarged perspective view of the wire rope seismic support shown in Figure 1, and Figures 5 and 6 are front and side views respectively showing state models when a horizontal load is applied to the wire rope seismic support. Figure 7 is a horizontal load-displacement characteristic diagram of the wire rope seismic support, Figure 8 is a characteristic diagram showing the transfer characteristics of the wire rope earthquake support, Figure 9 is a front view showing a conventional example of a glove box, Figure 10 is a view taken along arrow A-A in Figure 9, and Figure 11.
The figure is a sectional view taken along the line B--B in FIG. 9, and the figure is a sectional view taken along the line C--C in FIG. 15...Wire rope seismic support 16...Fixed floor 17...Support legs 20...Glove box agent Patent attorney Nori Chika Ken Yudo Daishimaru Ken 12 Figure 4 Figure 1 Figure 1 Figure A Figure A of the resonance frequency Figure A Figure! ! Figure Figure Figure

Claims (1)

[Claims] A glove box characterized in that a plurality of wire rope seismic supports are provided between a main body fixed floor and a main body bottom, and slidable support legs are provided between the main body fixed floor and the main body bottom.