JPH07109950B2 - Electromagnetically shielded room and its door and window frames - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetically shielded room suitable for applications such as installation of a medical MRI apparatus (nuclear magnetic resonance imaging apparatus), its door frame and window frame.

2. Description of the Related Art The MRI apparatus is rapidly becoming widespread in recent years mainly in national public hospitals as a new lesion image diagnostic apparatus replacing the conventional X-ray CT apparatus. The MRI system applies a uniform DC magnetic field to the human body, and when a high-frequency magnetic field with a specific frequency is applied, the hydrogen atoms distributed in the human body are excited by nuclear magnetic resonance to remove the high-frequency magnetic field. Then, the process of returning to the original equilibrium state after a certain relaxation time is electrically detected, and a diagnostic image showing the internal structure of the human body is obtained.

The MRI apparatus has a strong static magnetic field and a high-frequency magnetic field generation source, and the change in the magnetic field vector of hydrogen atoms inside the human body based on nuclear magnetic resonance must be received by a pickup coil. Electromagnetically shielded room is required.

As a conventional electromagnetic shield room used for such an application, one in which a copper foil is attached to the inner and outer surfaces of a wooden frame forming a floor surface, a wall surface, and a ceiling surface, and the joint portion is soldered and joined is known. ing. Further, the door frame and the window frame for the entrance and exit are also joined to the copper foil by soldering in order to obtain a predetermined shielding effect.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention According to such a conventional technique, the electromagnetic shield room is
It requires carpentry work to build a wooden framework, and sheet metal work to attach copper foil and solder joints. At the same time, the drawback that construction costs tend to be excessive was inevitable.

Therefore, in view of the drawbacks of the prior art, an object of the present invention is to connect panel materials to form at least a wall surface and a ceiling surface, and to include all the joining ribs between a door frame and a window frame. An object of the present invention is to provide an electromagnetically shielded room, which requires a very short construction period and can easily realize a reasonable construction cost, and its door frame and window frame by bolting and connecting the connecting portions.

Means for Solving the Problems The configuration of the first invention according to the present application for achieving the above object is to connect at least a wall surface and a ceiling surface by connecting panel materials formed by bending a single plate material to be self-supporting. The panel material is formed with joint ribs with inner flanges on the entire peripheral edge, and the joint ribs are abutted toward the inside of the room and bolted at equal pitches to connect the inner flange and joint ribs. The gist is to attach a cover member that shields the

The structure of the second invention comprises an upper frame formed by bending a plate material so as to be self-supporting, a pair of standing frames and a lower frame, and an upper surface of the upper frame and an outer surface of the standing frame are inner flanges of a panel material forming a wall surface. The gist of the invention is to connect the attached joint ribs with bolts at equal pitches, and additionally attach a cover member that shields both the inner flange and the joint ribs.

The lower surface of the lower frame may be bolted to the inner flanges of the joining ribs of the panel material forming the floor surface at equal pitches, and may be additionally provided with a cover member that shields both the inner flanges and the joining ribs.

Moreover, the structure of 3rd invention consists of the 1st member of the indoor side and the 2nd member of the outdoor side which bent and shape | molded the plate material so that it could be self-supporting, and was back-joined, These 1st, 2nd members are each rear part. The gist of the invention is to form a joint rib with an inner flange on the inner side of the joint rib, and to connect the joint rib with each other by bolting at an equal pitch and to attach a cover member that shields both the inner flange and the joint rib.

In addition, the outer surface of the first member can be bolted to the joint ribs with the inner flange of the panel material forming the wall surface at equal pitches, and a cover member that shields both the inner flange and the joint ribs can be attached. .

According to the configuration of the first aspect of the invention, at least the wall surface and the ceiling surface are formed by bolting and connecting a panel material formed by bending a single plate material so as to be self-supporting. It can be manufactured in a factory, brought to the site, and assembled as a whole. At this time, the size of the joint ribs and inner flanges formed on each panel material, the bolt pitch at the time of bolting and connecting, etc. are set to predetermined dimensions,
It is known that a predetermined shield effect can be realized by additionally providing a cover member that shields both the inner flange and the joining rib. Further, the floor surface may be formed by connecting the same panel material as that of the wall surface or the ceiling surface, or may be formed by a method of pasting copper foil using a conventional technique.

According to the configuration of the second invention, since the upper frame and the upright frame are bolted to the joint ribs of the panel material forming the wall surface, each side of the corresponding door is connected via, for example, a conductive shield block. By making electrical contact with the end face, a predetermined shield effect can be easily realized for the whole including the door. The lower surface of the lower frame is connected to the inner flange of the panel material that forms the floor surface by bolting at an equal pitch, so that even if the floor surface is made of the panel material, the lower surface of the lower frame is well An electrical connection state can be formed.

According to the configuration of the third invention, by combining the first and second members, it is possible to easily make a mechanically strong window frame having a high shielding effect. However, the window material at this time shall be used in a state where the metal mesh-containing material that is in electrical contact with the window frame is fitted and killed. If the outer surface of the first member is bolted and connected to the joining rib of the panel material, the window frame is integrated with the panel material, and a better shielding effect can be realized.

Example Hereinafter, an example will be described with reference to the drawings.

In the electromagnetically shielded room, the panel materials 11, 11 ... Are connected to form a floor surface F1, four circumferential wall surfaces F2, F2 ..., and a ceiling surface F3 (first
Figure).

The electromagnetically shielded room is built inside the building, and its surroundings are surrounded by the walls W, W ... of the building, and where necessary, doors D, doorway EN with D, peep window W
D, a cable entry CP for installed equipment is provided.

The panel material 11 is formed by bending a single plate material so as to be self-supporting, and joint ribs 11b, 11b ... Having inner flanges 11a, 11a. ). Bolt holes 11c, 11c ... Are drilled at equal pitches in each joining rib 11b, and the adjacent panel members 11, 11 have corresponding joining ribs 11b.
b, 11b are struck toward the room and bolts 11d, 11d ...
Bolts can be connected via the nuts 11e, 11e .... The joint ribs 11b, 11b after connection are covered with a channel-shaped cover member 12, and the cover member 12 is fixed to the inner flanges 11a, 11a via tapping screws 12a, 12a.

The basic dimensions of the panel material 11 are about 2450 mm in length and about 900 mm in width,
It is convenient to have a plate thickness of 1.2 to 1.6 mm. To obtain a predetermined shielding effect, the height of the joint rib 11b is about 60 mm, the width of the inner flange 11a is about 20 mm, and the pitch of the bolt holes 11c, 11c ...
It is recommended to set the size of each part to about 50 mm. The size of the cover member 12 is determined so as to match the sizes of the inner flange 11a and the joining rib 11b (Fig. 3). That is, the cover member 12 includes the corresponding inner flanges 11a and 11a and the joining ribs 11b and 1b.
Both 1b can be shielded from the indoor side. However,
The basic dimensions of the panel material 11 may be appropriately changed in each corner of the floor surface F1, wall surfaces F2, F2, ..., Ceiling surface F3, and the like.

The panel materials 11, 11 ... Forming the floor surface F1 are insulated from the floor WF of the building through insulating liners 21, 21 ... (FIGS. 4 to 6). The insulating liner 21 is attached on the base channel 25, and the base channel 25 is fixed on the base plate 24. Base plate 24
Are fixed by anchor bolts 22 via liners 23. The floor surface F1 is constructed by laying joists F11, floor plate materials F12 and F13, and a floor sheet F14 on the upper surface of the panel material 11.

The panel material 11 forming the floor surface F1 is positioned via the angle material 26 (FIG. 4), and the insulating liner 27 is interposed between the angle material 26 and the panel material 11.

The panel material 11 forming the floor surface F1 and the panel material 11 forming the wall surface F2 are different from the inner flange 11a of the former in the joining rib 1 of the latter.
Connected by bolting 1b. However, the width of the former inner flange 11a at this time has the same dimension as the height of the latter joint 11b, and the L-shaped reinforcing member 28 with the nut members 28a and 28a is provided in the lower portion of the former inner flange 11a. However, the pitch of the bolts 11d that connect the two is the panel material 1
This is based on the case where the joining ribs 11b and 11b of 1 and 11 are connected by bolting. In addition, the cover member 12 includes the reinforcing member 28.
L-shaped to reach the lower end of the
By bolting together with the receiving member 29 that supports 11, the corresponding inner flanges 11a, 11a of the panel materials 11, 11,
Both the joining ribs 11b and 11b can be shielded.

The panel materials 11, 11 ... Are grounded to the ground G at a single point.

At a place where the weight of the installation device M is heavy, a pedestal Ma is installed on the panel material 11 (Fig. 6). On the side of the frame Ma, joist F1
Angle members Mb, Mb supporting 1 are attached.

The wall surface F2 is provided on the front surface of the panel materials 11, 11 ... with the base materials F21, F21.
The wall material F22 is fixed via ... (Figs. 1 and 4)
Figure). A width lumber F23 is installed at the lower end of the wall material F22. Further, the corners of the wall surfaces F2 and F2 use the panel material 11 for corners (Fig. 7), and the panel material 11 for corners and the panel material 11 adjacent thereto are also joined by the cover member. By bolted connection with 12.

The connection structure of the panel material 11 forming the wall surface F2 and the panel material 11 forming the ceiling surface F3 is similar to that of the former and the panel material 11 forming the floor surface F1 (FIG. 8). That is, both are bolted and connected via the L-shaped reinforcing member 28 and the cover member 12. The ceiling material F32 is attached to the lower surface of the ceiling rail F31 by fixing the ceiling rail F31 to the lower surface of the latter via the receiving member 29.

Doors D and D of the doorway EN are inward-opening Kannon doors (No. 9)
Figure). The doors D and D are made by appropriately bending a plate material,
On one side, open / close knobs D1 and D1 are attached, and on the other side,
A pocket portion D2 for inserting the shield block D3 is formed. However, the shield block D3 is a packing material in which a conductive metal braid coating is formed on the surface of a rubber elastic body, and when the doors D and D are closed, a complete electrical insulation is provided between the doors D and D. Contact can be realized. Door D,
D is openably and closably attached to a pair of left and right standing frames 51, 51 forming a part of the door frame via hinges D4, D4.

Each standing frame 51 is formed by bending a single plate material so as to be self-supporting, so that all the hinge fixing portions 51a and the rear door-stop portion 5 are formed.
1b and an intermediate pocket portion 51c are formed on the inner surface side (FIG. 10). The pocket portion 51c opens inward, and the shield block 51d is inserted therein. Further, another shield block 51e is attached to the upper and lower ends of the door stop 51b.

The outer surface of the standing frame 51 is bolted to the joining ribs 11b of the panel material 11 forming the wall surface F2 at equal pitches (FIG. 9). However, the reinforcing member 52 is attached to the standing frame 51, and the cover member 12 at that time is formed in a Z shape reaching the surface of the wall surface F2, and the inner flange 11 of the panel member 11 is formed.
Both a and the joint rib 11b are shielded.

The upper ends of the standing frames 51, 51 are connected by an upper frame 53 (Fig. 11).

The upper frame 53 has a pocket portion 53a that opens forward and is formed in the middle portion of the lower surface, and the shield block 5a is formed in the pocket portion 53a.
3b is inserted. Further, an opening portion 53c is provided in the front portion of the lower surface of the upper frame 53, and a round bar-shaped fixing member 53d is attached to the opening portion 53c so as to engage with a catch member D5 incorporated in the door D. However, the catch member D5
Is projected to the upper end surface of the door D through the connecting rod D6 in conjunction with the opening / closing knobs D1 and D1, and the fixing member 53d is formed through the opening 53c.
Shall be engaged.

The upper surface of the upper frame 53 is a wall surface just like the outer surfaces of the standing frames 51, 51.
A cover member 12 is attached to the joint rib 11b of the panel material 11 forming F2 by bolting. At this time, another reinforcing member 54 corresponding to the reinforcing member 52 is also installed in the upper frame 53.

A lower frame 55 is arranged by connecting the lower ends of the standing frames 51, 51 (Figs. 10 and 12). That is, the door frame surrounding the doors D and D is a standing frame 51 formed by bending a plate material so as to be self-supporting,
It consists of 51, an upper frame 53, and a lower frame 55.

The upper surface of the lower frame 55 bulges in a mountain shape and is at substantially the same level as the floor line FL, which is at the same level as the floor surface F1. Pockets D7 are formed on the lower end surfaces of the doors D and D,
A shield block D8 is attached to the pocket portion D7 so as to be in sliding contact with the lower frame 55. Further, a fixing member 55a is attached inside the lower frame 55 so as to engage with another catch member D5 protruding from the lower end surface of the door D. However, the catch member D5 operates in conjunction with the upper catch member D5 by operating the opening / closing knobs D1 and D1,
The lower frame 55 should project to the inside.

The lower surface of the lower frame 55 is bolted and connected to the inner flange 11a of the panel material 11 forming the floor surface F1 at an equal pitch, and the cover member 12 is attached. The connection mode at this time is
This is exactly the same as the case of connecting the panel material 11 forming the floor surface F1 and the panel material 11 forming the wall surface F2 (FIG. 4). That is, the cover member 12 is formed in an L shape reaching the lower end of the reinforcing material 28, and the inner flange 11 of the corresponding panel material 11 is formed.
Both a and the joining rib 11b can be shielded.

The viewing window WD is a double window for fitting and killing (FIG. 13), and the first member 61 on the indoor side and the second member on the outdoor side are provided around the double window.
A window frame formed by back-joining 62 and 62 is formed.

Each of the first and second members 61 and 62 is a frame member formed by bending a plate member so as to be self-supporting and having a substantially symmetrical cross section as a whole. In the middle part of each inner surface,
Step portions 61a and 62a are formed, flat portions 61b and 62b are formed in the front portion, and joint ribs 61 with inner flanges 61c and 62c are formed in the rear portion.
d and 62d are formed. However, the front-rear direction here means that the inside of the first member 61 is the front and the outside thereof is the rear, and the outside of the second member 62 is the front and the inside is the rear.

A frame member 64 is fixed to the plane portions 61b and 62b via machine screws 64a (Fig. 14). The frame member 64 includes step portions 61a and 6a.
It is possible to hold the transparent window members 63, 63 between them and the 2a. However, a fine conductive metal mesh 63a is sandwiched between the window frames 63, 63, and the peripheral edge of the metal mesh 63a is electrically connected to the first and second members 61, 62 via the metal members 63b, 63c. The window members 63 and 63 are held at their peripheries by a suitable cushion member 63d.

The outer surface of the first member 61 is bolted and connected to the joint ribs 11b of the panel material 11 forming the wall surface F2 at equal pitches (FIG. 13), and the connecting structure is the standing frame 51 of the door frame, 51, the same as the connection structure of the upper frame 53 and the panel material 11 (Fig. 9,
(Fig. 11). The outer surface of the second member 62 is connected to the wall W of the building (Fig. 13).

In addition, the first and second members 61 and 62 have their respective joining ribs 61.
Although the d and 62d are abutted against each other and bolted and connected at an equal pitch, the cover member 12 is additionally provided. This connecting structure is similar to the connecting structure of the panel members 11 and 11 (Fig. 2).

FIG. 15 shows an example of actual measurement data regarding the shielding effect of the electromagnetic shield room having such a configuration. That is,
When there are cover members 12, 12, ..., Frequency range 20-100M
At Hz, an attenuation of about 110 dB or more can be obtained. However, here, as the panel material 11, 11 ..., 1.6m
Uses m-thick galvanized steel sheet. Moreover, even when the cover members 12, 12 ...
An attenuation amount of 95 dB or more is obtained, and in any case, it can be sufficiently used for the purpose of installing an MRI device. Generally, the electromagnetic shield room used for the same purpose is 60-100d.
This is because the amount of attenuation above B is targeted.

The figure also shows the amount of attenuation in the case of the double-bonded copper foil structure according to the conventional method. According to this invention,
At low frequencies, it is roughly equivalent to the conventional method, or
More excellent results were obtained, and in the high frequency range,
Depending on the presence or absence of cover members 12, 12, ...
The result obtained is within the dB range.

In the above description, the panel material 11, the cover member 12, the door D, the standing frames 51, 51 forming the door frame, the upper frame 53, the lower frame 55, the first and second members 61, 62 forming the window frame, etc. For each of the constituent members, a metal plate material having good conductivity is used, and for example, a galvanized steel plate, a stainless steel plate, or the like is suitable. Also,
The dimensions and shape are as long as the predetermined shield effect can be obtained.
It can be changed to any form other than that shown. In addition,
The cover members 12, 12 ... May be omitted when an attenuation amount of about 95 dB is sufficient (FIG. 15).

The structure of the floor surface F1 is replaced with the connecting structure of the panel members 11, 11 ...
It is also possible to use a conventional copper foil pasting method. The copper foil at this time is attached to the floor WF of the building through the insulating paint and the wall F
It is only necessary to join four rounds to the panel materials 11, 11 ... that form 2, F2. The floor surface F1 can be formed on the copper foil pasted in this way with any floor material including concrete. it can. However, when copper foil is used for the floor surface F1, the lower frame 55 of the door frame is installed on the copper foil via an appropriate conductive spacer member, or is formed long until the lower surface reaches the copper foil. Then, it can be installed directly on the copper foil.

In addition, as for the structure of the cable lead-in port CP, for example, a gland plate for holding the cable therethrough may be fixed to a frame member having substantially the same shape as the first and second members 61 and 62.

Further, the window frame may be a single window instead of the double window structure, and in that case, only the first member 61 may be used and the rear portion may be directly connected to the wall W of the building. Further, the doors D and D used for the doorway EN are replaced by double doors instead of double doors.
It may be a double-opening parent-child door.

EFFECTS OF THE INVENTION As described above, according to the first aspect of the present application, each component is pre-manufactured in advance by factory-manufacturing each component member by bolting and connecting the panel material to form at least the wall surface and the ceiling. Since it can be brought in and assembled on site, not only the construction time required on site can be shortened significantly, but also the overall construction cost can be greatly reduced, and the obtained shielding effect can be obtained by the conventional method. It has an excellent effect that it is comparable to that.

According to the second and third inventions, by combining with the first invention, it is possible to easily perform the installation work of the entrance and exit of the electromagnetically shielded room and the observation window.

[Brief description of drawings]

1 to 15 show an embodiment, FIG. 1 is an explanatory perspective view of the entire structure, FIG. 2 is an exploded perspective view showing a connecting structure of panel materials, and FIG. 3 is a line XX of FIG. 4 to 6 are sectional views of the floor, FIG. 7 and FIG. 8 are sectional views of main portions of the wall surface, and FIG. 9 to FIG. Figures 13, 13 and 14 are schematic views of the main part of the window frame, and FIG. 15 is an example of measured data of the shield effect. F1 …… Floor surface F2 …… Wall surface F3 …… Ceiling surface 11 …… Panel material 11a …… Inner flange 11b …… Joining rib 12 …… Cover member 51 …… Standing frame 53 …… Upper frame 55 …… Lower frame 61 ...... First member 62 ...... Second member 61c, 62c ...... Inner flange 61d, 62d ...... Joining rib

Claims (5)

[Claims] 1. A panel material formed by bending a single plate material so as to be self-supporting and forming at least a wall surface and a ceiling surface. The panel material has a joint rib with an inner flange at the entire peripheral edge portion. And a cover member for shielding both the inner flange and the joining rib is attached, and the joining rib is abutted toward the inside of the room to be bolted and connected at an equal pitch. 2. An inner flange of a panel material, which comprises an upper frame formed by bending a plate material so as to be self-supporting, a pair of standing frames and a lower frame, and an upper surface of the upper frame and an outer surface of the standing frame form wall surfaces. A door frame for an electromagnetically shielded room, characterized in that it is bolted to an attached joining rib at equal pitches, and a cover member is provided to shield both the inner flange and the joining rib. 3. The lower surface of the lower frame is bolted and connected to an inner flange of a joining rib of a panel material forming a floor surface at equal pitches, and a cover member for shielding both the inner flange and the joining rib is attached. The door frame of the electromagnetically shielded room according to claim 2, characterized in that. 4. A plate member is formed by bending the plate member so as to be self-supporting and is joined to the back by a first member on the indoor side and a second member on the outdoor side, and the first and second members each have an inner flange at a rear portion thereof. And a cover member for shielding both the inner flange and the joining rib is additionally provided on the window frame of the electromagnetic shield room. . 5. An outer surface of the first member is bolted and connected to a joint rib with an inner flange of a panel material forming a wall surface at equal pitches, and a cover member for shielding both the inner flange and the joint rib is provided. The window frame of the electromagnetically shielded room according to claim 4, which is additionally provided.