JP4809726B2 - Door frame of electromagnetic shielding door - Google Patents

Description

  The present invention relates to a door frame of an electromagnetic wave shield door.

Conventionally, as disclosed in Patent Document 1, an electromagnetic shielding structure at the entrance and exit of an electromagnetic shielding room such as an MRI room is known. In the electromagnetic wave shielding structure disclosed in this document, as shown in FIG. 9, a door frame 100 made of aluminum or steel is configured, and the interior of the vertical frame 101, the upper frame, and the lower frame 103 of the door frame 100. A conductive material 105 extending from the wall or floor is connected to the side surface. The door frame 100 and the door 106 are electrically connected by a cushioning material 107 made of a conductive material, and an electric current flowing through the door 106 that has received electromagnetic waves flows to the door frame 100 through the cushioning material 107, and this door frame. The current flows from 100 through the conductive material 105 to the ground. Further, the current generated in the door frame 100 that has received electromagnetic waves also flows to the ground through the conductive material 105. Thereby, the electromagnetic shielding performance at the entrance and exit of the electromagnetic shielding room is exhibited.
Japanese Patent Laid-Open No. 7-94886

  In the door frame 100 disclosed in the patent publication, there remains room for improving the radio wave shielding performance. For example, the vertical frame 101 of the door frame 100 used as a general fitting is formed by bending a plate material, and an opening 110 is formed on the back side of the vertical frame 101 or the like. An anchor 111 is fixed at the opening 110, and the vertical frame 101 is coupled to the wall core member 112 via the anchor 111. For this reason, since radio waves from the outside may leak into the room through the opening 110, there is still room for improving the radio wave shielding performance in the conventional door frame 100. Moreover, the door frame 100 used as a general fitting is a structure which fastened the vertical frame 101 and the upper frame with the volt | bolt etc., for example. In this configuration, even if the vertical frame 101 and the upper frame are brought into close contact with each other and fastened, there may be a gap between the vertical frame 101 and the upper frame due to the influence of the installation, etc. Radio waves may leak into the room, and the conventional door frame 100 leaves room for improving radio wave shielding performance.

  Therefore, the present invention has been made in view of such a point, and the object thereof is to improve the radio wave shielding performance in the door frame of the electromagnetic shielding door while suppressing the complicated construction. .

  In order to achieve the above-mentioned object, investigations were repeated on where the leakage of radio waves originated, and the present invention was created based on the research results.

Specifically, the present invention provides a door frame of an electromagnetic shielding door comprising a pair of vertical frames, an upper frame that connects upper ends of both vertical frames, and a lower frame that connects lower ends of both vertical frames. Each of the vertical frames includes a frame member formed into a hollow column by bending at least one plate member, and a conductive cover member formed separately from the frame member, The frame member is formed with an opening extending in the vertical direction by being bent in a state where both end portions of the plate member are separated from each other, and the cover member is attached to the frame member so as to close the opening. The frame member is provided with a reinforcing member that supports a bracket supported by a wall of the shield room, and the reinforcing member is inside the frame member formed in a hollow column shape and is the cover member. Is disposed inside the cover portion. The insertion hole for inserting a bolt for fastening the said reinforcement member and the bracket are formed.

In the present invention, since the opening of the frame member is closed by the cover member, it is possible to increase the conduction area of current generated in the vertical frame by receiving radio waves from the outside. As a result,
Since the current flowing through the vertical frame can be easily passed to the ground, the radio wave shielding performance can be improved. Moreover, since the frame member which has an opening part can be used as a vertical frame, a general thing can be used as a member for the vertical frame formed by bending a board | plate material, As a result, cost increases. Can be suppressed. In addition, the construction work can be prevented from becoming complicated, and the construction period is not prolonged. Moreover, since the reinforcement member is provided, the support strength of the vertical frame can be improved while using a general plate material used for the frame member. Furthermore, since the reinforcing member is disposed inside the cover member, the supporting strength of the vertical frame can be improved without deteriorating the appearance of the vertical frame.

The pre Kitatewaku and the upper frame, these opposing faces are connected by a plurality of bolts, it may be an elastic member provided with electrical conductivity between the opposing surfaces.

In this aspect , since the elastic member is disposed between the vertical frame and the upper frame, it is possible to suppress deterioration of the electrical connection between the vertical frame and the upper frame due to the influence of installation. . That is, when the door frame is constructed by fastening the vertical frame and the upper frame with bolts, if the installation at the time of construction is poor, generally the close contact between the vertical frame and the upper frame is not sufficient, and a gap is generated between the two. It may become easy and radio wave shielding performance may not be exhibited sufficiently. On the other hand, in the present invention, an elastic member is disposed between the vertical frame and the upper frame, and since this elastic member has conductivity, the left and right vertical frames and the upper frame are independent of the installation at the time of construction. And the electric wave shielding performance can be improved. Furthermore, in the present invention, the door frame can be constructed by a so-called dry joint method in which the vertical frame and the upper frame are connected by bolts, so that the construction work can be prevented from becoming complicated, and the construction period is not prolonged. .

  Here, it is preferable that the elastic member is disposed on an outer peripheral portion between the opposed surfaces, and the plurality of bolts are disposed on an inner side surrounded by the elastic member.

  In this aspect, even if a gap is formed between the opposing surfaces, the gap is surrounded by the elastic member. For this reason, leakage of radio waves due to the presence of the gap can be suppressed. For this reason, radio wave shielding performance can be further improved.

  Furthermore, it is preferable that at least one of the vertical frame and the upper frame is provided with an accommodating portion for accommodating the elastic member.

  In this aspect, since the displacement of the elastic member can be prevented, it is possible to prevent the elastic member from being deformed unexpectedly. Thereby, the conduction | electrical_connection state of a vertical frame and an upper frame can be ensured in a favorable state.

  Moreover, it is preferable that a positioning member for positioning the vertical frame and the upper frame is provided.

  In this aspect, when the vertical frame and the upper frame are bolted together, the positioning of the both can be reliably performed. Thereby, the electrical connection between the vertical frame and the upper frame can be ensured, and the conduction state between the vertical frame and the upper frame can be ensured in a good state.

  Furthermore, it is preferable that the elastic member is divided into a plurality of portions according to the shape of the facing surface.

  In this aspect, even when the shape of the facing surface is not flat, it is possible to ensure the close contact between the vertical frame and the upper frame through the elastic member. As a result, the shape of the facing surface such as the shape of the side surface of the vertical frame can be prevented from being restricted, so that the upper part of the vertical frame facing the upper frame and the lower part of the vertical frame positioned below the upper frame Adjustment such as changing the shape of the vertical frame can be made unnecessary.

  As described above, according to the present invention, it is possible to improve the electromagnetic shielding performance in the door frame of the electromagnetic shielding door while suppressing the complicated construction.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  1A and 1B show an embodiment of a door frame of an electromagnetic wave shielding door according to the present invention together with an electromagnetic wave shielding door (hereinafter simply referred to as a shield door) 10, and FIG. b) is a cross-sectional view when viewed from the side. This door frame 20 supports the shield door 10 provided at the entrance of an electromagnetic wave shield room such as an MRI room so that the door can be opened and closed inside the room. As shown in FIG. 1A, the door frame 20 includes a pair of vertical frames 21 and 21, an upper frame 22, and a lower frame 23, and a rectangular space (frame space) S surrounded by these is an entrance / exit. It has become.

  As shown in FIG. 1B, the door frame 20 has a predetermined width in the direction connecting the room and the outdoors, and the shield door 10 is positioned at the indoor side end of the door frame 20. . The shield door 10 has a structure in which a plate material 11 made of a stainless steel plate is assembled in a hollow shape, and glass wool 12 is arranged therein.

  A handle 13 and a catcher 14 that is interlocked with the handle 13 are disposed at the door end side of the shield door 10. The handle 13 can be operated from both the outdoor side and the indoor side. The catcher 14 is for fixing the shield door 10 by abutting the tip of the catcher 14 against the vertical frame 21 of the door frame 20, and is configured so that the contact is released by the operation of the handle 13.

  As shown in FIG. 2, a hinge 16 is provided on the indoor side surface of the shield door 10, and the shield door 10 is configured as a hinged door that opens from the closed position in contact with the door frame 20 toward the indoor side.

  As shown in FIG. 3, the shield door 10 is provided with a protrusion 17 and a recess 18 at the door end side end and the suspension side end, respectively. Both the protrusion 17 and the recess 18 are formed by bending the plate 11 and are provided over the entire vertical direction of the shield door 10. Each of the protrusions 17 is disposed at the outdoor end of the shield door 10 and extends in a direction protruding when the shield door 10 is closed. Each concave portion 18 is formed in a rectangular shape with one side of the outdoor side open in a plan view, and is disposed at the end of the shield door 10 on the indoor side. Each recess 18 is provided with a shield rubber 19. The shield rubber 19 has a configuration in which a metal net is wound around an elastic body such as a prismatic rubber.

  Each of the vertical frame 21 on the door end side and the vertical frame 21 on the hanging end side includes a frame member 25 formed by bending a plurality of plate members into a hollow column shape. The plate material is a stainless steel plate. Glass wool 26 is arranged in the frame member 25.

  The side walls 28 on the front side of both vertical frames 21 are formed in steps. Specifically, the front-side side wall 28 includes an indoor side portion (indoor side portion) 28a and an outdoor side portion (outdoor side portion) 28b across the step portion, and the side wall 28 is provided with the indoor side portion 28a. However, it has a form that is retracted from the outdoor portion 28b. The step portion is set according to the position of the shield door 10 in the closed state.

  The frame member 25 of each vertical frame 21 is provided with a protrusion 25a and a recess 25b. These protrusions 25 a and recesses 25 b are provided to ensure electrical connection with the shield door 10, and are disposed on the indoor side portion 28 a of the side wall 28 on the front side of the vertical frame 21.

  The protrusions 25 a and the recesses 25 b are both formed by bending the plate material, and are provided over the entire vertical frame 21 in the vertical direction. In any vertical frame 21, the protruding portion 25 a has a shape that protrudes from the side wall on the indoor side of the vertical frame 21 toward the indoor side. When the shield door 10 is closed, the protrusion 25 a enters the concave portion 18 of the shield door 10. The arranged shield rubber 19 is recessed.

  The concave portion 25b provided in the vertical frame 21 on the door-end side is formed in a rectangular shape with one side on the indoor side open in a plan view, and the concave portion 25b provided in the vertical frame 21 on the hanging side is in a plan view. It is formed in a rectangular shape with one side on the inner space S side open. That is, each recess 25 b has a shape that is open according to the direction in which the projection 17 of the shield door 10 moves in accordance with the closing operation of the shield door 10.

  A shield rubber 30 is disposed in each recess 25b. The shield rubber 30 has a configuration in which a metal net is wound around an elastic body such as a prismatic rubber. The shield rubber 30 is set so that the projection 17 of the shield door 10 abuts and is recessed when the shield door 10 is in the closed position. Thereby, when the shield door 10 is closed, the shield door 10 and the vertical frame 21 are electrically connected.

  Each vertical frame 21 has a conductive plate 33 coupled to a side wall 32 on the back side (the side opposite to the frame space S). The conductive plate 33 is made of a thin copper plate and has a height equal to or higher than the height of the vertical frame 21. The conductive plate 33 is supported by a board 34 disposed in the wall of the shield room and disposed along the wall, and is grounded. The end of the conductive plate 33 on the vertical frame 21 side is bent and is sandwiched between the presser plate 35 and the frame member 25. As a result, a current generated when the vertical frame 21 receives radio waves flows through the conductive plate 33 to the ground.

  An opening 37 is formed in the side wall 32 on the back side of the frame member 25. The opening 37 is formed by separating both ends of the plate material when the plate material is bent to form a columnar shape. For this reason, the opening 37 has a shape extending in the vertical direction on the back side of the frame member 25, and is formed over the entire height direction of the frame member 25.

  As shown in FIG. 4, cover members 38 are attached to both the frame members 25 so as to close the openings 37 from the outside. The cover member 38 is made of a flat plate made of a stainless steel plate, and is formed separately from the frame member 25. The cover member 38 is arranged over the entire vertical direction of the vertical frame 21, and the cover member 38 is joined to the frame member 25 from the outside and is screwed on both sides in the width direction. Thereby, the vertical frame 21 becomes a shape by which the cross section was closed by the member which has electroconductivity.

  As shown in FIG. 3, a reinforcing member 39 is disposed on each frame member 25 inside the opening 37. The reinforcing member 39 is made of an iron flat plate, and a plurality of reinforcing members 39 are provided at intervals in the vertical direction. Each reinforcing member 39 is provided with a screw hole 39 a for screwing the bolt 40. The reinforcing member 39 is for supporting the bracket 42 supported by the wall body. That is, since the cover member 38 and the frame member 25 are made of thin stainless steel plates, the reinforcing member 39 that is slightly thicker than the cover member 38 is installed in order to improve the support rigidity of the bracket 42.

  A plurality of brackets 42 are arranged at intervals in the vertical direction. Each bracket 42 includes a vertical portion 42a and a horizontal portion 42b orthogonal to the vertical portion 42a, and is formed in an L-shaped cross section. The bracket 42 is arranged in a posture in which the vertical portion 42 a is parallel to the wall core member 43, and is fixed to the end portion of the wall core member 43. The lateral portion 42 b of the bracket 42 is disposed in parallel with the cover member 38.

  Insertion holes 42c and 38a through which the bolts 40 are inserted are formed in the lateral portion 42b of the bracket 42 and the cover member 38, respectively. The bolt 40 inserted into the insertion hole 42 c of the bracket 42 is inserted into the insertion hole 38 a of the cover member 38 and screwed into the screw hole 39 a of the reinforcing member 39. As a result, the vertical frame 21 is supported by the wall of the shield room via the bracket 42.

  The cover member 38 and the reinforcing member 39 are both conductive members. However, it is apparent that the cover member 38 is separately provided without the reinforcing member 39 having the entire size of the opening 37. This is due to reasons such as deterioration in shine and weight.

  Although not shown in the drawing, a shield tape is appropriately interposed at a portion where the plate members constituting the frame member 25 are joined together or a portion where the frame member 25 and the cover member 38 are joined. Yes.

  Each vertical frame 21 and the upper frame 22 are fastened by a plurality of bolts 45 as shown in FIG. This will be specifically described below.

  Each of the vertical frames 21 and the upper frame 22 is arranged such that the side wall 28 on the front surface side (the space S side in the frame) of the vertical frame 21 and the side wall 47 at the end portion in the longitudinal direction of the upper frame 22 are opposed to each other. Has been placed. That is, the side wall 28 on the front side of the vertical frame 21 and the side wall 47 at the longitudinal end of the upper frame 22 are opposed surfaces where the vertical frame 21 and the upper frame 22 face each other. As described above, the side wall 28 on the front surface side of the vertical frame 21 is formed in a step shape, and accordingly, the side wall 47 at the end portion in the longitudinal direction of the upper frame 22 is also formed in a step shape. That is, the side wall 47 at the end in the longitudinal direction of the upper frame 22 is divided into an indoor side part (indoor side part) 47a and an outdoor side part (outdoor side part) 47b across the stepped portion. The indoor side portion 47a protrudes from the outdoor side portion 47b.

  A fixing bracket 48 is fixed to the vertical frame 21 on the inner side of the indoor side portion 28 a in the side wall 28 on the front side. A fixing bracket 49 is fixed to the upper frame 22 on the inner side of the side wall 47 at the end in the longitudinal direction. The fixing bracket 49 on the upper frame 22 side is divided into a first member 49a arranged inside the indoor side portion 47a and a second member 49b arranged inside the outdoor side portion 47b. The fixing bracket 48 and the second member 49b on the vertical frame 21 side are arranged in parallel to each other. An insertion hole for the bolt 45 is formed in the fixing bracket 48 on the vertical frame 21 side, and a screw hole for screwing the bolt 45 is formed in the second member 49b. Then, the bolt 45 inserted through the insertion hole of the fixing bracket 48 from the vertical frame 21 side is screwed into the screw hole of the second member 49b, whereby the vertical frame 21 and the upper frame 22 are fastened by the bolt 45. Yes.

  A positioning member 51 is provided on each of the first member 49a and the second member 49b. The positioning member 51 extends from the fixed bracket 49 on the upper frame 22 side toward the vertical frame 21. A positioning hole 52 is formed at a position corresponding to the positioning member 51 on the side wall 28 on the front surface side of the vertical frame 21, and the positioning member 51 is inserted into the positioning hole 52, thereby The positional relationship with the vertical frame 21 is defined. The positioning member 51 can be constituted by a bolt or a pin.

  In order to screw the bolt 45 into the second member 49b, the vertical frame 21 is positioned with respect to the upper frame 22 by the positioning member 51, and then the bolt 45 is inserted from the vertical frame 21 side. For this reason, the cover member 38 of the vertical frame 21 is formed with a through hole 38b, and the cover member 38 is provided with a lid member 53 that closes the through hole 38b. The lid member 53 is detachably attached to the cover member 38 by being screwed to the cover member 38. Then, when the door frame 20 is assembled, the lid member 53 is removed, so that the bolt 45 can be fastened through the through hole 38b.

  Between the side wall 28 on the front surface side of the vertical frame 21 and the side wall 47 at the end in the longitudinal direction of the upper frame 22, a spacer 55 and a conductive elastic member 57 are disposed. The spacer 55 includes a bottom surface portion 55a and a rib portion 55b formed on the peripheral portion thereof, and is formed in a dish shape. The spacer 55 is divided into an indoor portion and an outdoor portion according to the shape of the side wall 47 of the upper frame 22. The bottom surface portion 55 a is formed with an insertion hole through which the bolt 45 screwed to the fixing bracket 49 is inserted. The bottom surface portion 55 a is overlapped with the side wall 47 of the upper frame 22.

  As shown in FIG. 4, the spacer 55 is formed to be slightly smaller than the space formed between the side wall 28 on the front surface side of the vertical frame 21 and the side wall 47 at the end in the longitudinal direction of the upper frame 22. . On the other hand, at the end portion in the longitudinal direction of the upper frame 22, the peripheral wall 22 a protrudes from the side wall 47 constituting the longitudinal end surface. As a result, a space is formed between the rib portion 55b of the spacer 55 and the peripheral wall 22a of the upper frame 22 so as to extend along the outer periphery between the opposing surfaces of the vertical frame 21 and the upper frame 22 and to have a certain width. Has been. This space is formed as a housing portion 59 for housing the elastic member 57. That is, the accommodating part 59 is formed in the outer peripheral part between the opposing surfaces of the vertical frame 21 and the upper frame 22, and the elastic member 57 is disposed in the accommodating part 59. The bolt 45 that fastens the vertical frame 21 and the upper frame 22 described above is disposed inside the elastic member 57.

  The elastic member 57 is made of a shield material in which a metal net is wound around rubber, and is formed in a tubular shape. The shield member 57 is slightly thicker than the thickness of the spacer 5 (the height of the rib portion 55b). Since the opposing surfaces of the vertical frame 21 and the upper frame 22 are formed in a stepped shape, the shield member 57 is divided into an indoor portion and an outdoor portion accordingly. The shield member 57 is disposed in the housing part 59 in a state of being bent along the housing part 59. The shield member 57 is provided so as to be elastically deformable according to the fastening by the bolt 45.

  The shield member 57 is accommodated in the accommodation portion 59 and is sandwiched between the rib portion 55b and the peripheral wall 22a of the upper frame 22, so that the shield member 57 can be prevented from being displaced. The shield member 57 is disposed on the outer peripheral portion between the opposed surfaces of the vertical frame 21 and the upper frame 22, so that radio wave leakage from the gap between the opposed surfaces can be reliably prevented.

  In the present embodiment, the spacer 55 is disposed so that the bottom surface portion 55a is on the upper frame 22 side. Alternatively, the spacer 55 may be disposed so that the bottom surface portion 55a is on the vertical frame 21 side. . Moreover, although the spacer 55 is formed in the dish shape, it may replace with this and may form in the plate shape which has the same thickness as the height of the rib part 55b.

  As shown in FIG. 6, the upper frame 22 includes a frame member 61 formed into a hollow column by bending a plurality of plate members. The plate material is a stainless steel plate. The glass wool 62 is disposed in the frame member 61. In FIG. 5, the glass wool 62 is omitted for convenience.

  Similar to the vertical frame 21, the frame member 61 of the upper frame 22 is provided with a protrusion 61 a and a recess 61 b. These protrusions 61 a and recesses 61 b are provided to ensure electrical connection with the shield door 10. The protrusions 61 a and the recesses 61 b are both formed by bending the plate material, and are provided over the entire length of the upper frame 22. The protruding portion 61a has a shape protruding from the indoor side end of the upper frame 22 toward the indoor side, and comes into contact with the shield rubber 64 of the shield door 10 when the shield door 10 is closed. The shield rubber 64 has a configuration in which a metal net is wound around an elastic body such as rubber, and is disposed so as to extend in the width direction of the door 10 along the upper end portion of the shield door 10.

  The recess 61b of the upper frame 22 is formed in a rectangular shape with one side on the indoor side open in a side view. A shield rubber 66 is disposed in the recess 61b. The shield rubber 66 has a configuration in which a metal net is wound around an elastic body such as a prismatic rubber.

  A conductive plate 68 is coupled to the upper surface (back surface) of the upper frame 22. The conductive plate 68 is disposed in the wall of the shield room and is made of a thin copper plate. The conductive plate 68 is sandwiched between the frame member 61 and the presser plate 69.

  An opening 70 is formed on the upper surface of the frame member 61 of the upper frame 22, and a cover member 71 is provided so as to close the opening 70. The cover member 71 is made of a flat plate made of a stainless steel plate. Thereby, the upper frame 22 has a shape in which the cross section is closed by a conductive member.

  The opening 70 is formed so as to extend in the longitudinal direction of the upper frame 22, and the cover member 71 having the same length as the upper frame 22 is used. A plurality of reinforcing members 72 are arranged inside the opening 70 at intervals in the length direction of the opening 70. The reinforcing member 72 is for supporting the bracket 73 supported by the wall body. An insertion hole for a bolt 74 is formed in the bracket 73 and the cover member 71, and the bolt 74 inserted through the insertion hole is screwed into the reinforcing member 72.

  On the other hand, as shown in FIG. 7, the lower frame 23 is disposed in a pit 76 formed on the floor. The floor has a structure in which lightweight concrete is placed on the foundation slab concrete, and the pits 76 are provided in an upper layer portion made of the lightweight concrete. The pit 76 has a size corresponding to the size of the door frame 20.

  The lower frame 23 includes a base 78, a connection member 79, and a tread plate 80. The base 78 includes a base body 78a and a support member 78b. The base body 78a is formed by bending a plate material (stainless steel plate) so that an opening 78c is formed on the lower surface, and is formed in a rectangular shape in plan view. The support member 78b is made of an iron plate, and is constructed so as to close the opening 78c of the base body 78a. The support member 78b is fixed to the floor by anchor bolts 82.

  The tread plate 80 and the connecting member 79 are disposed on a base 78. The connection member 79 is disposed below the shield door 10, and the tread plate 80 is disposed on the outdoor side of the shield door 10. The tread plate 80 is an integral member formed by bending a plate made of a stainless steel plate.

  The connecting member 79 is an integral member formed by bending a plate made of a stainless steel plate. The connecting member 79 is disposed on both sides of the inclined joint 79a whose height decreases in the direction in which the shield door 10 opens (the direction from the outdoor side toward the indoor side). The presser portion 79b is integrally provided.

  The joint portion 79a is configured in a shape in which a shield material 84 provided at the lower end portion of the shield door 10 abuts. The shield member 84 includes a support portion 84a fixed to the shield door 10 and a shield portion 84b coupled to the support portion 84a. The shield part 84 b is arranged substantially parallel to the joint part 79 a of the connection member 79. The support portion 84a is configured to be elastically deformable, and when the shield door 10 is closed, the shield portion 84b comes into contact with the connection member 79, so that the support portion 84a bends accordingly. Thereby, the shield material 84 and the connection member 79 are reliably joined.

  Each holding portion 79b of the connecting member 79 is formed in an L shape, and a vertical portion 79c extending downward from the joint portion 79a and a horizontal portion extending horizontally from the lower end portion of the vertical portion 79c toward the outdoor side. Part 79d. The lateral portion 79 d of the outdoor-side presser portion 79 b extends into the tread plate 80. The foot board 80 is disposed so as to cover the base 78 including the lateral part 79d of the pressing part 79b on the outdoor side. The tread plate 80 is fastened and fixed to the base 78 by screws 86.

  A conductive plate 88 made of a copper plate is sandwiched between the lateral portion 79d of the pressing portion 79b and the base 78. The conductive plate 88 is embedded in the upper layer portion of the floor such that its base end portion 88a extends in the vertical direction at the door side end portion of the lower frame 23, and the front end portion 88b of the conductive plate 88 is a floor pit 76. It is extended upward from. And the front-end | tip part 88b of the electrically conductive plate 88 is bent so that the base main body 78a may be followed, and the front-end | tip part 88b of the conductive plate 88 has covered the whole upper surface of the base main body 78a.

  An insertion hole for inserting a screw 89 is provided in each of the lateral portion 79d of the holding portion 79b on the outdoor side of the connection member 79 and the distal end portion 88b of the conductive plate 88. Correspondingly, a screw hole is provided in the upper surface of the base body 78a. Then, by screwing screws 89 inserted from above into the insertion holes into the screw holes of the base body 78a, the connection member 79 is in a state where the conductive plate 88 is sandwiched between the base body 78a. The base 78 is coupled. Thereby, the connection member 79 functions as a press plate for fixing the conductive plate 88. That is, the connection member 79 is for electrically connecting the shield door 10 and the conductive plate 88, and the joint 79a of the connection member 79 is pressed from above by the shield member 84 of the shield door 10. The pressing portion 79b of the connecting member 79 is more closely attached to the conductive plate 88. Thereby, since the current from the shield door 10 efficiently flows to the ground through the connection member 79 and the conductive plate 88, the radio wave shielding performance can be effectively exhibited.

  In this embodiment, since the front-end | tip part 88b of the electroconductive board 88 is arrange | positioned along the upper surface part of the base main body 78a, the screwing operation | work for fixing the electroconductive board 88 becomes operation from the top. For this reason, the work load can be reduced as compared with the prior art. That is, conventionally, the work of fixing the conductive plate has been the work of screwing or soldering at a position below the floor and slightly higher than the slab concrete, and in a state of being bent down low It becomes work. For this reason, there has been a problem that the work load is large and it cannot be performed efficiently and takes time. On the other hand, in the present embodiment, the screwing work of the conductive plate 88 is a work in which the operator turns downward and screwes the screw 89 slightly below the floor surface, so the work load can be reduced. Moreover, it can contribute to shortening the construction period.

  Here, the result of verifying the radio wave shielding performance by the door frame 20 according to the present embodiment will be described. FIG. 8 shows an example of the result of measuring the shielding performance by the door frame 20, and shows the result by the door frame 20 of the present embodiment and the result by the conventional door frame. As shown in the figure, even when a radio wave in any frequency band of 30 MHz to 150 MHz arrives, the shielding performance is improved as compared with the prior art, and in this embodiment, 100 dB can be secured regardless of the frequency band. I understand.

  As described above, according to the present embodiment, since the opening 37 of the vertical frame 21 is closed by the cover member 38, the conduction area of the current generated in the vertical frame 21 by receiving radio waves from the outside is increased. Can be made. As a result, since the current flowing through the vertical frame 21 can be easily passed to the ground via the conductive plate 33, the radio wave shielding performance can be improved. Further, since the frame member 25 having the opening 37 used for fixing the bracket 42 connected to the wall body can be used for the vertical frame 21, it is generally used as a member for a vertical frame formed by bending a plate material. As a result, it is possible to suppress an increase in cost. In addition, the construction work can be prevented from becoming complicated, and the construction period is not prolonged.

  Moreover, in the present embodiment, since the reinforcing member 39 that supports the bracket 42 is provided on the frame member 25 of the vertical frame 21, the vertical frame 21 is used while using a general plate material used for the frame member 25. The support strength can be improved. Furthermore, since the reinforcing member 39 is disposed inside the cover member 38, the support strength of the vertical frame 21 can be improved without deteriorating the appearance of the vertical frame 21.

  In the present embodiment, since the shield member 57 is disposed between the vertical frame 21 and the upper frame 22, the electrical connection between the vertical frame 21 and the upper frame 22 deteriorates due to the influence of installation. Can be suppressed. That is, in the present embodiment, the shield member 57 is disposed between the vertical frame 21 and the upper frame 22, and the shield member 57 has conductivity, so that the left and right vertical frames are independent of the installation at the time of construction. The electric conduction state between the upper frame 21 and the upper frame 22 can be improved, and the radio wave shielding performance can be improved. Furthermore, since the door frame 20 can be constructed by a so-called dry joint method in which the vertical frame 21 and the upper frame 22 are connected by a bolt 45, the construction work can be prevented from becoming complicated, and the construction period can be prolonged. Absent.

  In this embodiment, since the shield member 57 is disposed on the outer peripheral portion between the opposing surfaces, even if a gap is formed between the opposing surfaces, the gap is surrounded by the elastic member 57. For this reason, leakage of radio waves due to the presence of the gap can be suppressed, and radio wave shielding performance can be further improved.

  Furthermore, in this embodiment, since the accommodating part 59 which hold | maintains the shield member 57 is provided so that the shield member 57 may not position-shift, the position shift of the shield member 57 can be prevented, and this makes the shield member 57 unexpected. It is possible to prevent the deformation. Therefore, the conductive state between the vertical frame 21 and the upper frame 22 can be ensured in a good state.

  Furthermore, in this embodiment, since the positioning member 51 is provided, when bolting the vertical frame 21 and the upper frame 22, both can be positioned reliably. Thereby, the conduction | electrical_connection state of the vertical frame 21 and the upper frame 22 is securable.

  Further, in this embodiment, since the shield member 57 is divided, the close contact between the vertical frame 21 and the upper frame 22 is ensured through the shield member 57 even when the shape of the facing surface is not flat. can do. Accordingly, the shape of the facing surface such as the side shape of the vertical frame 21 can be prevented from being restricted, so that the upper portion of the vertical frame 21 facing the upper frame 22 and the vertical frame 21 positioned below the upper frame 22 Adjustment such as changing the shape of the vertical frame 21 between the lower portion and the like can be made unnecessary.

  The present invention is not limited to the present embodiment, and various changes and improvements can be made without departing from the spirit of the present invention. For example, in the present embodiment, the longitudinal end surface of the upper frame 22 and the side surface of the vertical frame 21 are assembled so as to face each other, but instead, the lower surface of the upper frame 22 and the upper surface of the vertical frame 21 are The upper frame 22 and the vertical frame 21 may be assembled so as to face each other. In this case, the lower surface of the upper frame 22 and the upper surface of the vertical frame 21 are fastened with bolts, and the spacer 55 and the shield member 57 are disposed between the lower surface of the upper frame 22 and the upper surface of the vertical frame 21. It becomes the composition to be done.

  Moreover, it is possible to omit the configuration in which the opening 37 of the vertical frame 21 is closed with the cover member 38 according to the required radio wave shielding performance. Further, it is possible to omit the configuration in which the shield member 57 is disposed between the opposed surfaces of the vertical frame 21 and the upper frame 22 according to the required radio wave shielding performance. Further, in the present embodiment, the shield door 10 has been described as an open door that can be opened and closed on the indoor side, but an open door that can be opened and closed on the outdoor side may be used, and the same effect is exhibited. it can.

(A) It is a front view of the door frame and electromagnetic wave shield door of the electromagnetic wave shield door which concern on embodiment of this invention, (b) It is sectional drawing shown in the state which looked at the door frame and the electromagnetic wave shield door from the side. It is sectional drawing shown in the state which looked at the said door frame and the electromagnetic wave shield door from upper direction. It is sectional drawing which expands and shows the principal part of FIG. It is a perspective view of a vertical frame and an upper frame on the hanging side. It is sectional drawing shown in the state which looked at the vertical frame and the upper frame from upper direction. It is sectional drawing shown in the state which looked at the upper part of the upper frame and the electromagnetic wave shield door from the side. It is sectional drawing shown in the state which looked at the lower part of the lower frame and the electromagnetic shielding door from the side. It is a characteristic view which shows the shielding performance for every frequency band. It is sectional drawing which shows the door frame of the conventional electromagnetic wave shield door.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shield door 20 Door frame 21 Vertical frame 22 Upper frame 23 Lower frame 25 Frame member 37 Opening part 38 Cover member 38a Insertion hole 39 Reinforcement member 40 Bolt 42 Bracket 45 Bolt 51 Positioning member 57 Shield member 59 Housing part

Claims (6)

A door frame of an electromagnetic shielding door provided in a shield room, comprising a pair of vertical frames, an upper frame that connects upper ends of both vertical frames, and a lower frame that connects lower ends of both vertical frames. ,
Each vertical frame includes a frame member formed into a hollow column by bending at least one plate member, and a conductive cover member formed separately from the frame member,
In the frame member, an opening extending in the vertical direction is formed by bending both ends of the plate material apart from each other,
The cover member is attached to the frame member so as to close the opening ,
The frame member is provided with a reinforcing member that supports a bracket supported by the wall of the shield room,
The reinforcing member is disposed inside the cover member inside the frame member formed in a hollow columnar shape,
The cover member is a door frame of an electromagnetic shielding door in which an insertion hole for inserting a bolt for fastening the bracket and the reinforcing member is formed . Before and said upper frame Kitatewaku, these opposing faces are connected by a plurality of bolts, the electromagnetic wave shielding door according to claim 1 in which the elastic member is provided having a conductivity between the opposing surfaces Door frame. The elastic member is disposed on an outer peripheral portion between the opposing surfaces,
The door frame of the electromagnetic wave shielding door according to claim 2 , wherein the plurality of bolts are disposed on the inner side surrounded by the elastic member. The door frame of the electromagnetic wave shield door according to claim 2 or 3 , wherein a housing portion for housing the elastic member is provided in at least one of the vertical frame and the upper frame. The door frame of the electromagnetic shielding door of any one of Claim 2 to 4 in which the positioning member which positions the said vertical frame and the said upper frame is provided. The door frame of the electromagnetic wave shield door according to any one of claims 2 to 5 , wherein the elastic member is divided into a plurality of portions according to the shape of the facing surface.

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